JP2020092744A - Absorbent article having composite stretchable sheet - Google Patents

Abstract

To provide an absorbent article having a composite stretchable sheet that is excellent in stretchability, fitability, and further cushioning properties.SOLUTION: A composite stretchable sheet 10A of the absorbent article according to the present invention has an elastic member 13 held between a first sheet 11 and a second sheet 12. Both sheets 11, 12 have protrusions and indentations. The first sheet 11 has first regions 16 having a short distance between fiber fixing portions that fix constituent fibers to one another, and second regions 17 having a long distance between fiber fixing portions. The first regions 16 are located on tops and bottoms of the protrusions and indentations, and the second regions 17 are located between the tops and the bottoms. Both sheets 11, 12 are joined at joining portions 14 where both the sheets overlap with each other. The joining portions 14 are spaced on both sides of the elastic member 13 along a stretching direction of the composite stretchable sheet. The elastic member 13 is fixed to both sheets 11, 12 at only both end portions 3a or at a plurality of positions along the stretching direction together with both the end portions 3a.SELECTED DRAWING: Figure 1

Description

The present invention relates to an absorbent article having a composite elastic sheet and a method for manufacturing the composite elastic sheet.

As a constituent material of absorbent articles such as disposable diapers, sanitary napkins and incontinence pads, there are cases where a composite elastic sheet in which a filamentous elastic member is sandwiched and fixed between two nonwoven fabrics in an expanded state is used.

As the composite elastic sheet, the present applicant has previously proposed the outer body of the pants-type wearing article described in Patent Document 1, the composite elastic sheet described in Patent Document 2, and the like.

JP, 2014-004115, A JP, 2016-055481, A

In recent years, there is a need for a composite stretch sheet that has good stretchability, excellent fit, and cushioning properties.

The exterior body described in Patent Document 1 causes the elastic member in the composite body to be cut when the composite body in which two nonwoven fabrics are joined is stretched by performing tooth groove processing, and thus the exterior body has an uneven shape. Disturbance may occur, and there was room for improvement from the viewpoint of cushioning. Although the composite stretchable sheet described in Patent Document 2 has good stretchability and excellent fitability, since hot melt is applied to the entire surface and the thickness tends to be reduced due to the adhesive force of the hot melt, Patent Document 2 Has not examined improving the cushioning property.

Therefore, an object of the present invention is to provide an absorbent article having a composite stretchable sheet having excellent stretchability, excellent fitability, and excellent cushioning properties, and a method for producing the composite stretchable sheet.

The present invention is an absorbent article having a composite elastic sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
In the composite elastic sheet, the first fiber sheet and the second sheet are each formed in an uneven shape having a top portion and a bottom portion,
The first fibrous sheet has a first region in which the distance between the fiber fixing portions that fixes the intersections of the constituent fibers of the sheet is relatively short, and a second region in which the distance between the fiber fixing portions is relatively long. Have,
The first region is located at the top and the bottom, and the second region is located between the top and the bottom,
The first region extends in an orthogonal direction orthogonal to the stretching direction of the composite stretching sheet,
The first fiber sheet and the second sheet are joined at a joint portion formed at a position where the bottom portions of both sheets overlap each other,
A plurality of the joint portions are arranged on both sides of the elastic member in the orthogonal direction at intervals along the expansion and contraction direction,
The elastic member is arranged between the first sheet and the second sheet and is fixed at both ends in the elastic direction of the elastic member, or is fixed by being sandwiched between the joint portions. An absorbent article is provided which is fixed to at least one of the above.

Further, the present invention is a method for producing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
A first elastic member extending along the roll rotation direction between a first convex roll having a convex portion on the circumferential surface and a first shaping roll having a concave portion that meshes with the convex portion of the first convex roll; The first fiber sheet is passed through in a state where the first elastic member is disposed on the side of the first fiber sheet facing the first shaping roll, and the first fiber sheet is at least in the roll rotation direction. A first step of shaping the first fibrous sheet into a concavo-convex shape by stretching along the
In parallel with the first step, between the second convex roll having a convex portion on the peripheral surface and the second shaping roll having a concave portion that meshes with the convex portion of the second convex roll, along the roll rotation direction. The extended second elastic member and the second sheet in a state where the second elastic member is disposed on the side of the second sheet facing the second shaping roll, and the second elastic member is passed through the second sheet. A second step in which the sheet is stretched at least along the roll rotation direction, and the second sheet is unevenly shaped;
The first fibrous sheet and the second sheet, each of which has been unevenly shaped, are overlapped so that the arrangement surfaces of the elastic members face each other, and the first fibrous sheet and the second sheet that are superposed are A third step of joining the first convex roll and the second convex roll by abutting the convex portions of each other,
In the first step and the second step, the fibrous sheet unevenly shaped by stretching is conveyed while being pressed against the peripheral surfaces of the first convex roll and the second convex roll by the tension of the elastic member,
In the third step, the first elastic member and the first elastic member in a stretched state are formed in a gap formed along the roll rotation direction by abutting the convex portions of the first convex roll and the second convex roll. The first fibrous sheet and the second sheet, which are superposed, are joined to each other through two elastic members on both sides of the first elastic member or the second elastic member in the orthogonal direction orthogonal to the expansion/contraction direction of the elastic member, A method for manufacturing a composite elastic sheet is provided.

Further, the present invention is a method for producing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
Between the convex roll having a convex portion on the peripheral surface and the joining roll that abuts on the top of the convex portion of the convex roll, the first fiber sheet, the second sheet, and the sheet are arranged between the sheets. The first fibrous sheet and the second sheet are joined to each other on both sides of the elastic member in the orthogonal direction orthogonal to the expansion and contraction direction of the elastic member through the elastic member extended along the roll rotation direction. And a first step of forming a laminated sheet with a joint portion formed,
The laminated sheet is introduced into a meshing portion of a shaping roll that is arranged on the downstream side in the rotational direction of the convex roll than the convex roll and the joining roll, and that has a concave portion that meshes with the convex portion, and unevenly shape Has two steps,
In the second step, while the elastic member in an extended state is passed through the void portion formed along the roll rotation direction by the engagement of the convex roll and the shaping roll, the joint portion is the convex roll. Under the state of being aligned so as to be located at the top of the convex portion and the bottom of the concave portion of the shaping roll, stretching between the joint portions adjacent to each other in the roll rotation direction of the laminated sheet, of the composite stretch sheet A manufacturing method is provided.

Further, the present invention is a method for producing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
The first fiber sheet, the second sheet, and the mesh between the convex roll having a convex portion on the peripheral surface and the shaping roll having a concave portion that meshes with the convex portion are arranged between the sheets, and By introducing the elastic member extended along the roll rotation direction, the first fibrous sheet and the second sheet are provided on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member. At the same time as joining to form a joining portion, unevenness is formed by stretching between the joining portions adjacent to each other in the roll rotation direction,
At the time of the uneven shaping, the elastic member in the stretched state is passed through the void formed along the roll rotation direction by the engagement of the convex roll and the shaping roll, thereby providing a method for producing a composite stretch sheet. is there.

A method for producing a concavo-convex composite elastic sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
At least the first fiber sheet is passed through the first fiber sheet between a first convex roll having a convex portion on the circumferential surface and a first shaping roll having a concave portion that meshes with the convex portion of the first convex roll. The first fibrous sheet is stretched along the roll rotation direction to shape the first fibrous sheet, and the first fibrous sheet having the roughened shape is drawn inward from the circumferential surface of the first convex roll on the circumferential surface of the roll. The first step of carrying while holding
In parallel with the first step, the second sheet is passed between a second convex roll having a convex portion on its peripheral surface and a second shaping roll having a concave portion that meshes with the convex portion of the second convex roll. , Drawing the second sheet at least along the roll rotation direction to shape the second sheet unevenly, and sucking the unevenly shaped second sheet inward from the peripheral surface of the second convex roll. The second step of carrying while holding on the roll peripheral surface by
The first fibrous sheet and the second sheet each having an uneven shape, and the elastic members arranged between the non-opposing surfaces of the convex rolls of the sheets and extending along the roll rotation direction. A third step of joining a laminated sheet in which the above are overlapped by abutting the convex portions of the first convex roll and the second convex roll,
In the third step, the composite stretchable sheet in which the elastic member in the stretched state is passed through a gap formed along the roll rotation direction by the abutting of the convex portions of the first convex roll and the second convex roll. The present invention provides a method of manufacturing the same.

Further, the present invention is a method for producing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
A first elastic member stretched along a roll rotation direction and a first fiber between a convex roll having a convex portion on its peripheral surface and a first shaping roll having a concave portion that meshes with the convex portion of the convex roll. A sheet in a state in which the first elastic member is disposed on the side of the first fiber sheet facing the first shaping roll, and the first fiber sheet is stretched at least along the roll rotation direction. A first step of shaping the first fiber sheet into a concavo-convex shape,
In parallel with the first step, between a second shaping roll having a convex portion and a concave portion meshing with each other on the peripheral surface and a third shaping roll, a second elastic member extended along the roll rotation direction. The second sheet is passed through in a state where the second elastic member is arranged on the side of the second sheet facing the second shaping roll, and the second sheet is passed at least along the roll rotation direction. A second step of stretching the second sheet to form an uneven shape,
The first fibrous sheet and the second sheet, each of which has an uneven shape, are superposed such that the phases of the unevenness of the sheets are the same and the arrangement surfaces of the elastic members are opposite to each other, and are formed thereby. The laminated sheet is shaped into concave and convex again by engaging the convex portion of the convex roll with the concave portion of the third shaping roll, and the concave and convex shaped laminated sheet is internally formed from the peripheral surface of the convex roll. A third step of conveying while holding on the roll peripheral surface by suction toward
The unevenly shaped laminated sheet is passed between the convex roll and the joining roll which is arranged on the downstream side in the rotation direction of the convex roll with respect to the third shaping roll and which abuts on the top of the convex portion. A fourth step of joining the first fiber sheet and the second sheet on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member,
In the first step, the first fiber sheet is stretched by the engagement of the convex roll and the first shaping roll, and the first fiber sheet unevenly shaped by stretching is stretched by the tension of the first elastic member. While conveying it while pressing it on the peripheral surface of the convex roll,
In the second step, the second sheet is stretched by the meshing of the shaping rolls, and the second sheet unevenly shaped by stretching is stretched by the tension of the second elastic member to the third shaping roll. It is transported while pressing on the peripheral surface of
In the third step, the first elastic member and the second elastic member that are in an expanded state in a gap formed along the roll rotation direction by abutting the convex portions of the convex roll and the third shaping roll with each other. Through the elastic member, the first fiber sheet and the second sheet are superposed,
In the fourth step, at least the first elastic member and the second elastic member in a stretched state are passed through a gap formed along the roll rotation direction by contact between the convex roll and the joining roll. A method for manufacturing a stretchable sheet is provided.

Further, the present invention is a method for producing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
The first fiber sheet, the second sheet, and the mesh between the convex roll having a convex portion on the peripheral surface and the shaping roll having a concave portion that meshes with the convex portion are arranged between the sheets, and Introducing the elastic member stretched along the roll rotation direction to stretch each fibrous sheet, and both the unevenly shaped sheets are sucked inward from the peripheral surface of the convex roll to the roll of the convex roll. A first step of conveying while holding on the peripheral surface,
Between the convex roll and the shaping roll, between the joining roll arranged on the downstream side in the rotational direction of the convex roll and contacting the top of the convex portion, both the unevenly shaped sheets are passed, 1) a second step of joining the fiber sheet and the second sheet on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member,
In the second step, there is provided a method for manufacturing a composite stretchable sheet, which comprises passing the elastic member in an extended state through a gap formed along the roll rotation direction by abutting the convex roll and the joining roll. is there.

According to the absorbent article of the present invention, it has good stretchability, good fitability, and good cushioning property. Further, according to the present invention, the composite stretchable sheet used for the absorbent article can be efficiently manufactured.

FIG. 1 is a preferred embodiment of a composite elastic sheet included in the absorbent article of the present invention, FIG. 1(a) is a perspective view thereof, and FIG. 1(b) is bb of FIG. 1(a). It is a line sectional view, and Drawing 1 (c) is a cc line sectional view of Drawing 1 (a). FIG. 2 is a plan view of the composite elastic sheet shown in FIG. FIG. 3 is another embodiment of the composite elastic sheet included in the absorbent article of the present invention, FIG. 3(a) is a perspective view thereof, and FIG. 3(b) is bb of FIG. 3(a). It is a line sectional view, and Drawing 3 (c) is a cc line sectional view of Drawing 3 (a). FIG. 4 is still another embodiment of the composite stretchable sheet included in the absorbent article of the present invention, FIG. 4(a) is a perspective view thereof, and FIG. 4(b) is b- of FIG. 4(a). FIG. 4B is a sectional view taken along line b, and FIG. 4C is a sectional view taken along line cc of FIG. 4A. FIG. 5 shows another embodiment of the composite stretchable sheet included in the absorbent article of the present invention, FIG. 5(a) is a plan view thereof, and FIG. 5(b) is b- of FIG. 5(a). It is a b line sectional view. FIG. 6 is a preferred embodiment of an apparatus for manufacturing a composite elastic sheet included in the absorbent article of the present invention, FIG. 6(a) is a perspective view thereof, and FIG. 6(b) is a side view thereof. FIG. 7: is a schematic diagram which shows the state which stretches a sheet|seat using the manufacturing apparatus shown in FIG. FIG. 8: is a schematic diagram which shows another state which stretches a sheet|seat using the manufacturing apparatus shown in FIG. FIG. 9 is a first convex roll and a second convex roll provided in the manufacturing apparatus shown in FIG. 6, FIG. It is the schematic diagram which looked at those meshing parts from the side surface. FIG. 10 is another embodiment of the manufacturing apparatus of the composite elastic sheet|seat which the absorbent article of this invention has, FIG.10(a) is the perspective view, and FIG.10(b) is the side view. FIG. 11 is a first convex roll and a second convex roll provided in the manufacturing apparatus shown in FIG. 10, FIG. It is the schematic diagram which looked at those meshing parts from the side surface. FIG. 12 is a further embodiment of the manufacturing apparatus of the composite elastic sheet which the absorbent article of this invention has, FIG. 12(a) is its perspective view, and FIG. 12(b) is its side view. . 13A and 13B are a convex roll and a joining roll provided in the manufacturing apparatus shown in FIG. 12, FIG. 13A is a schematic view of the abutting portions thereof viewed from the front, and FIG. It is the schematic diagram which looked at the contact part from the side surface. FIG. 14 is another embodiment of the manufacturing apparatus of the composite elastic sheet which the absorbent article of this invention has, FIG.14(a) is the perspective view, FIG.14(b) is the side view. .. FIG. 15: is another embodiment of the manufacturing apparatus of the composite elastic sheet which the absorptive article of this invention has, FIG.15(a) is the perspective view, FIG.15(b) is the side view. FIG. 16 is another embodiment of the manufacturing apparatus of the composite elastic sheet|seat which the absorbent article of this invention has, FIG.16(a) is the perspective view, FIG.16(b) is the side view. .

The present invention will be described below based on its preferred embodiments. The absorbent article of the present invention generally has a vertically long shape having a longitudinal direction corresponding to a direction extending from the abdomen side of the wearer to the back side through the crotch portion and a width direction orthogonal to the longitudinal direction. The absorbent article has a crotch part arranged in the crotch part of the wearer, and an abdominal part and a dorsal part extending in the front and rear thereof. The crotch part has an excretion part facing part which is arranged to face the excretion part of the wearer when the absorbent article is worn, and the excretion part facing part is usually the central part in the longitudinal direction of the absorbent article or its vicinity. Is located in.

The absorbent article generally includes a topsheet located on the side of the wearer's skin facing surface, a backsheet located on the side of the non-skin facing surface, and an absorber interposed between the two sheets. The skin-facing surface is a surface facing the wearer's skin side when wearing the absorbent article, that is, the side relatively close to the wearer's skin, and the non-skin-facing surface is the skin side when wearing the absorbent article. The side facing away from, i.e., the side relatively far from the wearer's skin.

As the top sheet and the back sheet, various kinds of sheets conventionally used for this type of absorbent article can be used without particular limitation. For example, various non-woven fabrics, perforated films and the like can be used as the surface sheet. Examples of the back sheet include liquid-impermeable films and spunbond/meltblown/spunbond laminated nonwoven fabrics. A water-impermeable film may be provided with a plurality of fine pores to impart water vapor permeability to the film. A sheet having a good texture such as a non-woven fabric may be laminated on the outer surface of the back sheet for the purpose of further improving the touch of the absorbent article.

The absorber comprises an absorbent core. The absorbent core is, for example, a laminated fiber body of hydrophilic fibers such as cellulose including pulp, a mixed fiber body of the hydrophilic fiber and the absorbent polymer, a stack body of the absorbent polymer, and a space between two absorbent sheets. It is composed of a laminated structure in which an absorbent polymer is supported. The absorbent core may have at least its skin-facing surface covered with a liquid-permeable core wrap sheet, or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with the core wrap sheet. Good. As the core wrap sheet, for example, thin paper made of hydrophilic fiber, liquid permeable non-woven fabric or the like can be used.

In addition to the above-mentioned top sheet, back sheet, and absorber, depending on the specific application of the absorbent article, leak-proof cuffs extending along the longitudinal direction are arranged on both sides of the skin-facing surface side along the longitudinal direction. There are cases. Leakproof cuffs generally include a proximal end and a free end. The leak-proof cuff has a base end portion on the skin-facing surface side of the absorbent article and stands up from the skin-facing surface side. The leakproof cuff is made of a material that is liquid resistant, water repellent and breathable. An elastic member made of rubber thread or the like may be arranged in an extended state at or near the free end of the leakproof cuff. When the elastic member contracts when the absorbent article is worn, the leak-proof cuff stands up toward the wearer's body, and the liquid excreted on the surface sheet travels on the surface sheet and absorbs. It is effectively prevented from leaking outward in the width direction of the article.

Examples of the absorbent article having the above configuration include, but are not limited to, a deployable disposable diaper, a pants-type disposable diaper, a sanitary napkin, an incontinence pad, and the like.

1 and 2 show a first embodiment of a composite elastic sheet suitably used for the absorbent article of the present invention. The composite elastic sheet is a constituent material of the above-mentioned disposable diaper, sanitary napkin, incontinence pad, etc., for example, a top sheet, a back sheet, a sheet forming an absorber, a sheet forming a leak-proof cuff, or forming an outer surface of a diaper. It can be used as an exterior body. 1 and 2 show a relaxed state of the composite elastic sheet 10A according to the present embodiment, that is, a natural state in which no external force is applied to the composite elastic sheet 10A. The composite stretchable sheet 10A has a stretchable direction X that is the same as the extending direction of the elastic member 13 and an orthogonal direction Y that is orthogonal to this. Further, the composite stretchable sheet 10A includes two sheets, a first sheet 11 and a second sheet 12. The two sheets 11 and 12 may be made of the same material or different materials.

Further, the composite stretchable sheet 10A includes an elastic member 13 which is sandwiched and fixed between the two sheets 11 and 12. The elastic member 13 may have a sheet shape (non-perforated film, perforated film or fiber assembly), a band shape, or a thread shape, and preferably has a plurality of thread shapes or a band shape. The elastic members 13 extend in the expansion/contraction direction X and are arranged at intervals in the orthogonal direction Y. The distance between the adjacent elastic members 13 in the orthogonal direction Y may be the same or different. In this embodiment, the distances between the adjacent elastic members 13 in the orthogonal direction Y are the same. In addition, the elastic members 13 may have different thicknesses, and may have different expansion rates (expansion strains with respect to natural lengths) when being joined to the sheets 11 and 12.

The composite stretchable sheet 10A is stretchable along the direction in which the elastic member 13 extends. That is, the extending direction of the elastic member 13 and the extending/contracting direction of the composite elastic sheet 10 coincide with each other. On the other hand, in the orthogonal direction Y, the composite stretchable sheet 10A is substantially non-stretchable. The elasticity of the composite elastic sheet 10A is expressed due to the elasticity of the elastic member 13. In particular, it is preferable that the expansion/contraction direction X is the machine flow direction because it is easy to assemble the thread-shaped or band-shaped elastic member 13.

As shown in FIGS. 1A and 1B, one surface and the other surface are uneven. More specifically, each of the first sheet 11 and the second sheet 12 is shaped in an uneven shape. The first sheet 11 has a plurality of streak-shaped first convex portions 1a extending in the orthogonal direction Y and a plurality of streak-shaped first concave portions 1b also extending in the orthogonal direction Y. The first convex portion 1 a projects in a direction away from the elastic member 13. The first convex portions 1a and the first concave portions 1b are alternately arranged along the expansion and contraction direction X. When viewed along the expansion/contraction direction X, the first convex portions 1a are formed at equal pitches. Similarly, the first recesses 1b are also formed at an equal pitch. The pitch of the first convex portions 1a and the pitch of the first concave portions 1b are the same. The pitch of the 1st convex part 1a is the distance between the tops of the 1st convex part 1a which adjoins in the expansion-contraction direction X. The pitch of the first recesses 1b is the distance between the bottoms of the first recesses 1b adjacent to each other in the expansion/contraction direction X.

As shown in FIGS. 1A and 1B, the second sheet 12, like the first sheet 11, has a stripe-shaped second convex portion 2 a extending in the orthogonal direction Y and a stripe-shaped second convex portion 2 a also extending in the orthogonal direction Y. And a plurality of second recesses 2b. The second convex portion 2 a projects in a direction away from the elastic member 13. The second convex portions 2a and the second concave portions 2b are alternately arranged along the expansion/contraction direction X. When viewed along the expansion/contraction direction X, the second convex portions 2a are formed at equal pitches and are formed at the same pitch as the pitch of the first convex portions 1a. Similarly, the second recesses 2b are also formed at the same pitch, and are formed at the same pitch as the pitch of the first recesses 1b.

In the composite stretchable sheet 10A, as shown in FIG. 1(b), at the position of the first convex portion 1a of the first sheet 11 forming one surface, the second sheet 12 of the second sheet 12 forming the other surface is formed. The convex portion 2a is located. Further, the second recess 2b of the second sheet 12 is located at the position of the first recess 1b of the first sheet 11. The 1st sheet 11 and the 2nd sheet 12 are joined by the joining part 14 formed in the position where the bottom part of the 1st recessed part 1b and the bottom part of the 2nd recessed part 2b overlap, and it becomes the composite stretchable sheet 10A of uneven shape. ing. As a result, the composite stretchable sheet 10A exhibits good air permeability, is easily compressed and deformed, and exhibits good cushioning properties.

As shown in FIG. 1C, when the composite elastic sheet 10A is viewed along the orthogonal direction Y, the first convex portion 1a in the first sheet 11 is one elastic member adjacent in the orthogonal direction Y. The first small convex portion 1t whose relative height is relatively low at the position where the adjacent elastic members 13x are arranged beyond 13 and the relative height of the first small convex portion 1t is adjacent to the first small convex portion 1t. It is composed of a high first large convex portion 1k. The first small convex portion 1t and the first large convex portion 1k are formed by the processing described later. In the composite elastic sheet 10A, the first small convex portions 1t and the first large convex portions 1k are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the first convex portions 1a are in the orthogonal direction. It extends linearly along Y. In the first large convex portion 1k, the constituent fibers are bent at both corners on the expansion/contraction direction X side of the top portion, and the convex shape is difficult to collapse.

As shown in FIG. 1C, when the composite elastic sheet 10A is viewed along the orthogonal direction Y, the first large convex portion 1k has a relatively long length W1 along the orthogonal direction Y and the first small convex portion. In 1t, the length W2 along the orthogonal direction Y is relatively short. The length W1 of each 1st large convex part 1k may be the same, or may differ. Similarly, when viewed along the orthogonal direction Y, the lengths W2 of the first small convex portions 1t may be the same or different.

As shown in FIG. 1C, in the second sheet 12, the second convex portion 2a has a top height at a position where another elastic member 13z adjacent to the elastic member 13x in the orthogonal direction Y is arranged. The second small convex portion 2t is relatively low, and the second large convex portion 2k is adjacent to the second small convex portion 2t and the height of the top is relatively high. In the composite elastic sheet 10A, the second small convex portions 2t and the second large convex portions 2k are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second convex portions 2a are in the orthogonal direction. It extends linearly along Y. In the composite elastic sheet 10A, when viewed along the orthogonal direction Y, the length of the second large convex portion 2k along the orthogonal direction Y may be the same as or different from the length W1 of the first large convex portion 1k. Good. Similarly, the length of the second small convex portion 2t along the orthogonal direction Y may be the same as or different from the length W2 of the first small convex portion 1t.

Further, as shown in FIG. 1C, in the first sheet 11, the first recess 1b has a first small recess 1s having a relatively shallow bottom at a position where the elastic member 13x is arranged, It is composed of a first large recess 1d adjacent to the first small recess 1s and having a relatively deep bottom. The first large recessed portion 1d is a portion excluding the first small recessed portion 1s. In the composite elastic sheet 10A, the first small concave portions 1s and the first large concave portions 1d are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the first concave portions 1b are arranged along the orthogonal direction Y. And extends in a straight line. In the first sheet 11, when viewed along the orthogonal direction Y, the positions of the first large convex portion 1k and the first large concave portion 1d coincide with each other, and the first small convex portion 1t and the first small concave portion 1s. And are in the same position. That is, when viewed along the orthogonal direction Y, the length of the first large concave portion 1d along the orthogonal direction Y is the same as the length W1 of the first large convex portion 1k, and in the orthogonal direction Y of the first small concave portion 1s. The length along the length is the same as the length W2 of the first small convex portion 1t.

As shown in FIG. 1C, in the second sheet 12, the second recessed portion 2b has a second small recessed portion 2s having a relatively shallow bottom at a position where the another elastic member 13z is arranged, The second large concave portion 2d is adjacent to the second small concave portion 2s and has a relatively deep bottom portion. In the composite stretchable sheet 10A, the second small concave portions 2s and the second large concave portions 2d are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second concave portions 2b are arranged along the orthogonal direction Y. And extends in a straight line. In the second sheet 12, when viewed along the orthogonal direction Y, the positions of the second large convex portion 2k and the second large concave portion 2d coincide with each other, and the second small convex portion 2t and the second small concave portion 2s. And are in the same position. That is, when viewed along the orthogonal direction Y, the length of the second large concave portion 2d along the orthogonal direction Y may be the same as or different from the length W1 of the first large convex portion 1k. Similarly, the length of the second small concave portion 2s along the orthogonal direction Y may be the same as or different from the length W2 of the first small convex portion 1t.

As described above, the first convex portion 1a and the second convex portion 2a are linearly arranged along the orthogonal direction Y, and the first concave portion 1b and the second concave portion 2b are also linearly arranged along the orthogonal direction Y. Has been done. As a result, in the composite stretchable sheet 10A, as shown in FIG. 1B, the space 15 surrounded by the uneven first sheet 11 and the uneven second sheet 12 extends along the orthogonal direction Y. It is in a state of being linearly extended and regularly arranged in the expansion/contraction direction X at regular intervals. As a result, the composite stretchable sheet 10A exhibits good air permeability through the space 15 and is easily compressed and deformed to exhibit good cushioning properties.

As shown in FIG. 1C, the joint portion 14 is formed at a position where the bottom portion of the first recess 1b and the bottom portion of the second recess 2b which are adjacent to each other in the orthogonal direction Y with the elastic member 13 therebetween are overlapped with each other. The joint portions 14 are arranged on both sides of each elastic member 13 in the orthogonal direction Y as shown in FIGS. 1(c) and 2, and each elastic member as shown in FIGS. 1(b) and 2. They are arranged at regular intervals along the expansion/contraction direction X of 13. Since the joint portions 14 are arranged on both sides of each elastic member 13 in this manner, the elastic members 13 are less likely to come into contact with each other when the composite elastic sheet 10A expands and contracts, and the elastic properties of the composite elastic sheet 10A are improved, and the composite elastic sheet 10A increases. The appearance of the sheet 10A becomes good.

In the composite stretchable sheet 10A, as shown in FIGS. 1C and 2, the distance between the joint portions 14, 14 disposed on both sides of the elastic member 13 is wider than the diameter of the elastic member 13, so that the elastic member 13 However, it is not clamped and fixed by the joint portions 14, 14. As shown in FIG. 2, the elastic member 13 is fixed to the first sheet 11 and the second sheet 12 only in the joint regions 19 arranged at both ends 3a in the expansion/contraction direction X. Therefore, the elasticity of the composite elastic sheet 10A is improved. The joining regions 19 are located at both ends 3a of the elastic member 13 and extend linearly in the orthogonal direction Y. Only that both ends of the elastic member 13 in the expansion/contraction direction X are fixed to the first sheet 11 and the second sheet 12 is only when the ends of the elastic member 13 are in the joint region 19 in the joint region 19. However, it is also meant to include the case where the end portion of the elastic member 13 is located beyond the joining region 19 shown in FIG.

In the composite elastic sheet 10A having the above configuration, on the first sheet 11 side, the first convex portions 1a and the first concave portions 1b extending over the entire area in the orthogonal direction Y are alternately arranged regularly along the elastic direction X. It has been placed. On the other hand, on the second sheet 12 side, the second convex portions 2a and the second concave portions 2b extending over the entire area in the orthogonal direction Y are arranged regularly alternately along the expansion/contraction direction X. Then, when the composite elastic sheet 10A is expanded and contracted along the longitudinal direction thereof, the height of the first convex portion 1a and the second convex portion 2a, and the first concave portion 1b and the second concave portion 2b according to the degree of expansion and contraction. Reversibly increases and decreases in depth. As a result, the composite stretchable sheet 10A has an improved appearance and has a good texture.

As shown in FIG. 1(b), the first sheet 11 and the second sheet 12 which are members constituting the composite elastic sheet 10A have a relative distance between the fiber fixing portions that fix the intersections of the constituent fibers of the sheet. It has a very short first region 16 and a second region 17 in which the distance between the fiber fixing portions is relatively long. The part where the “distance between the fiber fixing parts is relatively short” is a part where the draw ratio of the drawing process is relatively low compared to the part where the “distance between the fiber fixing parts is relatively long”, or It is a portion that has not been stretched. The "fiber fixing part" is a bonding point between fibers, and is an embossed fusion part as seen in spunbonded nonwoven fabrics and heat roll nonwoven fabrics, a fusion point between sheaths as seen in air-through nonwoven fabrics, and meltblown nonwoven fabrics. It means the fusion-bonding point of fibers as seen, the bonding point by the inter-fiber adhesive found in resin-bonded nonwoven fabric, and the like. In the case of spun lace nonwoven fabric or needle punched nonwoven fabric, it corresponds to the entangled portion of the fibers. Whether the area is “the distance between the fiber fixing portions is relatively short” or “the distance between the fiber fixing portions is relatively long” is determined by observing the surface of the measurement target sample with a scanning electron microscope (SEM). ) Or using a microscope. If the original non-woven fabric before becoming the first sheet 11 and the second sheet 12 is a spun bond non-woven fabric, 20 or more places, if it is an air-through non-woven fabric or air-laid non-woven fabric, or 40 or more places if it is a resin bond non-woven fabric, constituent fibers The distance in the expansion/contraction direction X between the fusion points is measured to distinguish the first region 16 in which the distance between the fiber fixing portions is short and the second region 17 in which the distance between the fiber fixing portions is long. In the case of a spunlace nonwoven fabric or a needle punched nonwoven fabric, a portion having a small light transmission amount has a high fiber density and a distance between the fiber fixing portions is short. Therefore, this portion is defined as a first region 16 and a portion having a large light transmission amount is a second region. Area 17 is set. In the second area 17 of the first area 16 and the second area 17, the distance between the fiber fixing portions is relatively long, so that when the composite elastic sheet 10A expands and contracts, it exhibits good touch and elasticity. When the member 13 expands and contracts, it is easily deformed and exhibits good elasticity. The method of implementation is described below.

As shown in FIG. 1B, the first region 16 is located at the top of the first convex portion 1 a and the bottom of the first concave portion 1 b in the first sheet 11, and the second convex portion 2 a in the second sheet 12. Are located at the top and the bottom of the second recess 2b. The position of the first region 16 in the first convex portion 1a and the second convex portion 2a may be located substantially in the center of the sheet length between the joining portions 14 and may be in front of or behind. Therefore, the first region 16 extends in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. The term "extends in the orthogonal direction Y" means not only that it extends continuously in the orthogonal direction Y but also that it extends intermittently in the orthogonal direction Y. As shown in FIG. 1C, in the first sheet 11, the first region 16 is located at the top of each of the first large convex portion 1k and the first small convex portion 1t that form the first convex portion 1a. At the same time, it is also located at the bottom of each of the first large concave portion 1d and the first small concave portion 1s forming the first concave portion 1b. In the second sheet 12, the first region 16 is located at the top of each of the second large convex portion 2k and the second small convex portion 2t that form the second convex portion 2a, and forms the second concave portion 2b. It is also located at the bottom of each of the two large recesses 2d and the second small recess 2s. Therefore, the first region 16 continuously extends in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. Since the first region 16 extends in the orthogonal direction Y, the space 15 extending along the orthogonal direction Y is easily maintained in the composite elastic sheet 10A. As a result, the composite stretchable sheet 10A exhibits good air permeability through the space 15 and is easily compressed and deformed to exhibit good cushioning properties. Further, since the first region 16 is located at the position of the joint portion 14 that joins the bottom portion of the first recess 1b and the bottom portion of the second recess 2b, the joint strength of the joint portion 14 is improved and in the orthogonal direction Y. The space 15 extending along is easily maintained.

On the other hand, the second region 17 is located between the top of the first protrusion 1a and the bottom of the first recess 1b in the first sheet 11, as shown in FIG. 1(b). At the same time, the second region 17 is located between the top of the second protrusion 2a and the bottom of the second recess 2b in the second sheet 12. Therefore, the second region 17 also extends in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. In the first sheet 11, the second region 17 is located between the top of the first large convex portion 1k forming the first convex portion 1a and the bottom of the first large concave portion 1d forming the first concave portion 1b. , Located between the top of the first small convex portion 1t forming the first convex portion 1a and the bottom of the first small concave portion 1s forming the first concave portion 1b. In the second sheet 12, the second region 17 is located between the top of the second large convex portion 2k forming the second convex portion 2a and the bottom of the second large concave portion 2d forming the second concave portion 2b. It is located between the top of the second small convex portion 2t forming the second convex portion 2a and the bottom of the second small concave portion 2s forming the second concave portion 2b. Therefore, the second region 17 extends continuously in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. Therefore, the composite stretchable sheet 10A exhibits high stretchability as well as good cushioning properties.

Next, the second and third embodiments of the composite elastic sheet used in the absorbent article of the present invention will be described with reference to FIGS. 3 and 4. Regarding the composite stretchable sheets 10B and 10C according to the second and third embodiments, description will be given of components different from those of the composite stretchable sheet 10A according to the first embodiment, and similar components will be denoted by the same reference numerals and will be described. Omit it. The points that are not particularly described are the same as those of the composite elastic sheet 10A, and the description of the composite elastic sheet 10A is appropriately applied.

As shown in FIG. 3C, when the composite elastic sheet 10B according to the present embodiment is viewed along the orthogonal direction Y, the uneven first sheet 11 is in a portion where the elastic member 13 is arranged. The top of the first convex portion 1a extends horizontally in a straight line in the orthogonal direction Y.

As shown in FIG. 3C, when the composite stretchable sheet 10B is viewed in the orthogonal direction Y, the bottom of the first recess 1b in the first sheet 11 extends linearly in the orthogonal direction Y.

On the other hand, in the second sheet 12, as shown in FIG. 3C, the second convex portion 2a has a second small convex portion 2t having a relatively low top at the position where the elastic member 13 is arranged. And a second large convex portion 2k adjacent to the second small convex portion 2t and having a relatively high top. Therefore, in the composite elastic sheet 10B, the second small convex portions 2t and the second large convex portions 2k are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second convex portions 2a are orthogonal. It extends linearly in the direction Y.

As shown in FIG. 3C, when the composite elastic sheet 10B is viewed along the orthogonal direction Y, the second recess 2b has a relatively shallow bottom at the position where the elastic member 13 is arranged. It is composed of two small recesses 2s and a second large recess 2d adjacent to the second small recess 2s and having a relatively deep bottom. Therefore, in the composite stretchable sheet 10B, the second small concave portions 2s and the second large concave portions 2d are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second concave portions 2b are arranged in the orthogonal direction Y. It extends straight.

In the composite elastic sheet 10B according to the present embodiment, as in the composite elastic sheet 10A according to the above-described embodiment, as shown in FIG. 3B, the distance between the fiber fixing portions is relatively short. The first region 16 is located at the top of the first protrusion 1a and the bottom of the first recess 1b in the first sheet 11, and at the top of the second protrusion 2a and the bottom of the second recess 2b in the second sheet 12. doing. Further, the second region 17 in which the distance between the fiber fixing portions is relatively long is located between the top of the first convex portion 1 a and the bottom of the first concave portion 1 b in the first sheet 11, and the second sheet 12 is provided. Is located between the top of the second convex portion 2a and the bottom of the second concave portion 2b. Since the second region 17 in which the distance between the fiber fixing portions is relatively long extends continuously in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12 as described above, the composite stretchable sheet 10B is high. As well as exhibiting elasticity, it also exhibits good cushioning properties.

The composite elastic sheet 10C according to the third embodiment shown in FIGS. 4(a) and 4(b) has one surface and the other surface each having an uneven shape, but typically the shape of the front and back surfaces thereof. Have a matched shape. More specifically, the first projections of the first sheet 11 are arranged such that the first sheet 11 having the uneven shape forming one surface and the second sheet 12 having the uneven shape forming the other surface have the same phase. The second convex portion 2a of the second sheet 12 is located at the position of the portion 1a. Further, the second recess 2b of the second sheet 12 is located at the position of the first recess 1b of the first sheet 11. In the present embodiment, the first convex portion 1a and the second convex portion 2a are raised in the same direction. The composite stretchable sheet 10C has the joining portion 14 at the position where the top of the first protrusion 1a that can be the bottom of the first sheet 11 and the top of the second protrusion 2a that can be the bottom of the second sheet 12 overlap. Have Since the composite stretchable sheet 10C has a shape in which the concavo-convex shapes of the one surface and the other surface are the same, the composite elastic sheet 10C exhibits the same good cushioning property regardless of which surface is used.

As shown in FIG. 4C, when the composite stretchable sheet 10C is viewed along the orthogonal direction Y, the first convex portion 1a of the first sheet 11 has a top portion at the position where the elastic member 13 is arranged. It is composed of a first large convex portion 1k having a relatively high height and a first small convex portion 1t adjacent to the first large convex portion 1k and having a relatively low top. In the composite elastic sheet 10C, the first small convex portions 1t and the first large convex portions 1k are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the first convex portions 1a are in the orthogonal direction. It extends linearly in Y.

In the second sheet 12, as shown in FIG. 4C, the second convex portion 2a has a second small convex portion 2t having a relatively low top at the position where the elastic member 13 is arranged, and a second small convex portion 2t. The second large protrusion 2k is adjacent to the second small protrusion 2t and has a relatively high top. Therefore, in the composite stretchable sheet 10C, the second small convex portions 2t and the second large convex portions 2k are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second convex portions 2a are orthogonal to each other. It extends linearly in the direction Y. In the composite stretchable sheet 10C, when viewed in the orthogonal direction Y, the length of the second large convex portion 2k in the orthogonal direction Y is substantially the same as the length of the first small convex portion 1t.

Further, as shown in FIG. 4C, in the first sheet 11, the first recess 1b has a first small recess 1s having a relatively shallow bottom at a position where the elastic member 13 is arranged, The first large recess 1d is adjacent to the first small recess 1s and has a relatively deep bottom. Therefore, in the composite elastic sheet 10C, the first small concave portions 1s and the first large concave portions 1d are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the first concave portions 1b are arranged in the orthogonal direction Y. It extends straight. In the first sheet 11, when viewed along the orthogonal direction Y, the positions of the first large concave portion 1d and the first small convex portion 1t coincide with each other. That is, when viewed along the orthogonal direction Y, the length of the first large concave portion 1d along the orthogonal direction Y is substantially the same as the length of the first small convex portion 1t.

Then, as shown in FIG. 4C, in the second sheet 12, the second recessed portion 2b has a second small recessed portion 2s having a relatively shallow bottom at a position where the elastic member 13 is arranged, The second large concave portion 2d is adjacent to the two small concave portions 2s and has a relatively deep bottom portion. Therefore, in the composite stretchable sheet 10C, the second small concave portions 2s and the second large concave portions 2d are alternately arranged and continuous over substantially the entire area in the orthogonal direction Y, and the second concave portions 2b are arranged in the orthogonal direction Y. It extends straight. In the second sheet 12, when viewed along the orthogonal direction Y, the positions of the second large convex portion 2k and the second large concave portion 2d coincide with each other, and the first large concave portion 1d and the first small convex portion 1t are formed. The positions are the same. That is, when viewed along the orthogonal direction Y, the length of the second large convex portion 2k along the orthogonal direction Y is substantially the same as the length of the second large concave portion 2d along the orthogonal direction Y, and the first large concave portion 1d. And the length of the first small convex portion 1t along the orthogonal direction Y is also substantially the same.

As shown in FIG. 4B, the first sheet 11 and the second sheet 12 which are members constituting the composite stretchable sheet 10C include the first region 16 in which the distance between the fiber fixing portions is relatively short, and the fiber fixing portion. The second region 17 has a relatively long distance between the parts. The first region 16 is located at the top of the first protrusion 1a and the bottom of the first recess 1b in the first sheet 11, and at the top of the second protrusion 2a and the bottom of the second recess 2b in the second sheet 12. positioned. As shown in FIG. 4C, in the first sheet 11, the first region 16 is located at the top of each of the first large convex portion 1k and the first small convex portion 1t forming the first convex portion 1a. In addition, it is also located at the bottom of each of the first large concave portion 1d and the first small concave portion 1s forming the first concave portion 1b. In the second sheet 12, the first region 16 is located at the top of each of the second large convex portion 2k and the second small convex portion 2t that form the second convex portion 2a, and forms the second concave portion 2b. The second large recessed portion 2d and the second small recessed portion 2s are also located at the bottoms thereof. Therefore, the first region 16 continuously extends along the orthogonal direction Y in each of the first sheet 11 and the second sheet 12.

On the other hand, as shown in FIG. 4B, the second region 17 is located between the top of the first convex portion 1 a and the bottom of the first concave portion 1 b in the first sheet 11, and in the second sheet 12. It is located between the top of the second protrusion 2a and the bottom of the second recess 2b. In the first sheet 11, the second region 17 is located between the top of the first large convex portion 1k forming the first convex portion 1a and the bottom of the first large concave portion 1d forming the first concave portion 1b. In addition, it is also located between the top of the first small protrusion 1t forming the first protrusion 1a and the bottom of the first small recess 1s forming the first recess 1b. In the second sheet 12, the second region 17 is located between the top of the second large convex portion 2k forming the second convex portion 2a and the bottom of the second large concave portion 2d forming the second concave portion 2b. In addition, it is also located between the top of the second small convex portion 2t forming the second convex portion 2a and the bottom of the second small concave portion 2s forming the second concave portion 2b. Therefore, the second region 17 continuously extends along the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. Therefore, the composite stretchable sheet 10C exhibits high stretchability and good cushioning properties.

In the composite stretchable sheets 10A to 10C according to the above-described first to third embodiments, the elastic member 13 is fixed only in the joint regions 19 that are arranged at both ends 3a in the stretchable direction X and that extend in the orthogonal direction Y. . Further, both ends 3a of the elastic member 13 are fixed in the joint region 19, and as shown in FIG. 5(a), the gap between the joint portions 14, 14 arranged on both sides of the elastic member 13 is narrowed so that the elastic member 13 is However, it may be sandwiched and fixed to the first sheet 11 and the second sheet 12 at the joint portions 14, 14 at a plurality of positions at intervals along the expansion/contraction direction X. As shown in FIG. 5B, the first sheet 11 and the first sheet 11 at the portion sandwiched between the joint portions 14 and 14 are longer than the circumferential length of the elastic member 13 when the elastic member 13 is contracted from the expanded state. If the distance between the joint portions 14 and 14 is narrowed so that the length of the two sheets 12 surrounding the elastic member 13 is shortened, the elastic member 13 and the first member can be urged by the clamping pressure between the joint portions 14 and 14. This is preferable from the viewpoint that the frictional force between the sheet 11 and the second sheet 12 is increased and the elastic member 13 is easily fixed. Further, at the same time as the pressing force, the elastic member 13 and the first sheet 11 and/or the second sheet 12 are fused at the interface due to the heating at the time of bonding, which means that the elastic member 13 is more removed from the sheet. It is preferable because it becomes difficult.

In each of the above embodiments, the composite stretchable sheets 10A and 10B according to the first and second embodiments, in the relaxed state (free tension), the height h1 of the first convex portion 1a (see FIG. 1B). Is preferably 1 mm or more, and more preferably 3 mm or more. Further, it is preferably 15 mm or less, and more preferably 8 mm or less. The height h2 of the second convex portion 2a (see FIG. 1(b)) is preferably 1 mm or more, and more preferably 3 mm or more. Further, it is preferably 15 mm or less, and more preferably 8 mm or less. These can be formed by the following method. (1) A method of adjusting the amount of meshing between rolls described later (the higher the amount of meshing, the higher the height of the convex portion, but if the amount of meshing is too high, the elasticity of the sheet decreases and the convex portion (2) The method of adjusting the speed difference between the speed of feeding the sheet between the rolls described below and the peripheral speed of the convex roll (the higher the speed of feeding the sheet, the lower the draw ratio, The elasticity of the sheet is increased, and the amount of return of the sheet after stretching is reduced, so that the length of the sheet between the joints 14 is increased. As a result, the height of the convex portion is increased. 3) It can be achieved by a method of adjusting the insertion tension of the elastic member 13 (the higher the insertion tension, the larger the contraction amount and the higher the height). By doing so, it becomes easy to be crushed by an appropriate force and also has a repulsive force, which is excellent in cushioning property and facilitates the formation of the space 15. By these, the stretch ratio and the elongation at which elongation stops are adjusted.

In the relaxed state of the composite stretchable sheet 10C according to the third embodiment, the height h3 of the unevenness (see FIG. 4B) is preferably 1 mm or more, and more preferably 4 mm or more. Further, it is preferably 15 mm or less, more preferably 10 mm or less.

The height h1 to the height h3 can be measured as follows. The composite elastic sheet 10 is placed on a flat plate in a relaxed state, and the flat plate is placed thereon so that the load is 0.5 cN/cm ² . The cross section of the portion without the elastic member 13 is observed from the side surface with a microscope (in the same direction as in FIG. 3B), and the heights h1 to h3 are measured. The measurement is performed using 5 different samples, and the average value is used. When collecting a composite elastic sheet from an absorbent article such as a diaper or a sanitary napkin, the adhesive portion is peeled off using cold spray or the like.

From the viewpoint of providing a large number of concavities and convexities between the joint portions 14 adjacent to each other in the stretching direction X of the composite stretch sheet so as to exhibit good cushioning properties, in the composite stretch sheets 10A, 10B, and 10C, a relaxed composite stretch sheet is used. 1B is a ratio of the pitch P2 of the adjacent joint portions 14 to the value P1 obtained by doubling the repeating pitch of the first regions 16 in the expansion/contraction direction X of the composite elastic sheet as viewed in a cross section as shown in FIG. 1B. The value of P2/P1 is preferably 2 or more, more preferably 4 or more, preferably 40 or less, and more preferably 10 or less. In the stretch-extension state described below, the value P1 is preferably 0.5 mm or more and 20 mm or less, and the pitch P2 is preferably 1.5 mm or more and 50 mm or less. By making the value of P2/P1 an integral multiple by a method described later, a fine rugged appearance is formed. 1 to 4 have described the case where (P2/P1) is 1 as a typical example, but when (P2/P1) is 2 or more, many first regions 16 and second regions 16 are formed between the joints 14. Region 17 is included. When forming a bending point at the boundary between the first region 16 and the second region 17 by drawing force or heat, there are many bending points between the joints. Therefore, the amount of compressive deformation during compression is large, the compression resistance is small, and the cushioning property is soft. Further, in the third embodiment, the first sheet does not have a shape along with the second sheet as shown in FIG. 4B, and a space 15 can be formed between the first sheet and the second sheet. The value P1 and the pitch P2 are measured as follows.

<Method of measuring the value P1 obtained by doubling the repeating pitch of the first region 16>
From the composite elastic sheet in the natural state, a sample to be measured including the elastic member 13 and 11 joints 14 in the elastic direction X is cut into a rectangular shape. In a state where no tension is applied to the sample to be measured, the first regions 16 located at both ends in the expansion/contraction direction X of the 11 first regions 16 are marked with oil-based magic ink or the like. The first region 16 is observed as a convex portion or a concave portion (16 in FIG. 1B). The sample to be measured is elongated so that the elongation reaches the elongation at which it will be described later. Then, the length in the expansion/contraction direction X between the ten first regions 16 is measured. The value obtained by dividing the measured value by 10 is set as the repeating pitch interval of the first region 16. The measurement is performed three times at different sites, and the value obtained by doubling the average value is defined as the value P1.

<Measurement method of the pitch P2 of the joint portions 14 adjacent to each other in the expansion/contraction direction X>
From the composite elastic sheet in the natural state, a sample to be measured including the elastic member 13 and 11 joints 14 in the elastic direction X is cut into a rectangular shape. With no tension applied to the sample to be measured, the joints 14 located at both ends in the expansion/contraction direction X of the 11 joints 14 are marked with oil-based magic ink or the like. Then, tension is applied so as to reach the elongation and elongation described later, and the sample to be measured is elongated. Then, the length in the expansion/contraction direction X between the ten joining portions 14 is measured. A value obtained by dividing the measured value by 10 is defined as the interval between the adjacent joints 14 in the expansion/contraction direction X. The measurement is performed three times at different parts, and the average value is defined as the pitch P2.

In the composite stretchable sheets 10A to 10C according to the first to third embodiments, the repeating pitch of the first regions 16 in the first sheet 11 is doubled from the viewpoint of exhibiting different textures on the front surface side and the back surface side. It is preferable that the value P11 and the value P12 obtained by doubling the repeating pitch of the first regions 16 on the second sheet 12 are different. When P12>P11, the ratio of (P12/P11) is preferably 2 times or more and 20 times or less, and more preferably 3 times or more and 10 times or less. When P12<P11, the ratio of (P11/P12) is used. By doing so, the repeating pitch of the first region 16 on one surface side between the joint portions 14 can be made fine, and if the repeating pitch is small, the touch becomes soft. The value P11 and the value P12 are measured in the same manner as the method of measuring the value P1 described above.

In the composite stretchable sheets 10A and 10B according to the first and second embodiments, for example, by changing the height of the convex-concave portions of the first sheet 11 and the height of the convex-concave portions of the second sheet 12, From the viewpoint of exhibiting different textures on the front surface side and the back surface side, in the composite stretch sheets 10A and 10B, from the center position of the one joint portion 14 formed on the first sheet 11 in the stretching direction X of the joint portion. The length L1 along the first sheet 11 to the center position of another adjacent joint portion 14 and the length L1 adjacent to the joint portion 14 formed in the second sheet 12 in the expansion/contraction direction X of the joint portion. It is preferable that the length L2 along the second sheet 12 up to the center position of another joining portion 14 is different. The surface having a long length along the side has a soft texture due to the increased degree of freedom, and the surface having a short length has a small amount of stretching, so that a high strength can be obtained. The difference between the length L1 and the length L2, expressed as an absolute value, is preferably 2 mm or more, more preferably 3 mm or more, preferably 15 mm or less, and more preferably 8 mm or less. When the length L1 along the absolute value is shorter than L2, for example, the absolute value can be measured by the same method as the method for measuring the pitch P2 described above. L2 was obtained by cutting the convex loop portion (15) of the first sheet 11 along the orthogonal direction Y, measuring the elongation at the end of elongation using this sample, and then using this value to measure the pitch P2. It can be measured by a similar method.

From the viewpoint that the irregularity shape of the first sheet 11 is good and the appearance is good, in the composite stretchable sheets 10A to 10C according to the first to third embodiments, the original before being the first sheet 11 is used. The maximum elongation in the stretching direction X in the sheet 11a is preferably 50% or more, more preferably 140% or more, preferably 700% or less, and more preferably 500% or less. The maximum elongation can be measured as follows.

<Measurement method of maximum elongation>
Using the first sheet 11 or the second sheet 12, a rectangular test piece having a size of 200 mm in the expansion/contraction direction X and 50 mm in the orthogonal direction Y is cut out. The test piece is mounted on a tensile tester (Autograph AG-1kNIS manufactured by Shimadzu Corporation). The distance between chucks is 150 mm. The test piece is stretched in the stretching direction X of the test piece at a speed of 300 mm/min, and the load at that time is measured. The elongation at the maximum strength point is the maximum elongation. The number of samples is n5, and the maximum elongation is calculated from the average value.

In the composite stretch sheets 10A to 10C according to the first to third embodiments, the stretch direction X is widened so that the stretch range during use becomes wider, the range of application increases due to the difference in body shape, and it is easy to follow intense movements. The elongation at stop is preferably 100% or more, more preferably 300% or more, and preferably 600% or less, more preferably 500% or less. In order to obtain a high degree of elongation, the first region 16 is preferably continuous over the entire width in the orthogonal direction Y in each of the first sheet 11 and the second sheet 12. The elongation at rest can be measured as follows.

<Measurement method for elongation and elongation>
Using the composite stretch sheets 10A to 10C, rectangular test pieces are cut out in a size of 150 mm in the stretch direction X and 50 mm in the orthogonal direction Y orthogonal thereto. A test piece in a relaxed state is attached to a tensile tester (Autograph AG-1kNIS manufactured by Shimadzu Corporation). The distance between chucks is 100 mm. The test piece is stretched in the stretching direction X of the test piece at a speed of 300 mm/min, and the load at that time is measured. When the chuck-to-chuck distance of the test piece when the load is 500 cN/50 mm is B and the chuck-to-chuck distance of the original test piece is A, {(B−A)/A}×100 (%). If the sample breaks before the load reaches 500 cN/50 mm, the elongation at the maximum strength point is 0.8 times the elongation at which the elongation stops. The number of samples is set to n5, and the elongation at the end of elongation is determined from the average value.

From the viewpoint that the shapeability of the uneven shape of the first sheet 11 and the second sheet 12 is good and the appearance is good, in the plan view shown in FIG. 2, the composite stretchable sheets 10A to 10A according to the first to third embodiments. In 10C, the length L3 of the joint portion 14 in the expansion/contraction direction X is preferably shorter than the length L4 of the joint portion 14 in the orthogonal direction Y. The ratio of the length L4 to the length L3 (L4/L3) is preferably 2 or more, more preferably 3 or more, preferably 20 or less, and more preferably 1 or less. It is preferable that the value of the length L3 is 0.3 mm or more and 2 mm or less, and the value of the length L4 is 1 mm or more and 5 mm or less. The length L3 of the joint portion 14 in the expansion/contraction direction X is the maximum length of the joint portion 14 in the expansion/contraction direction X, and the length L4 of the joint portion 14 in the orthogonal direction Y is the maximum length of the joint portion 14 in the orthogonal direction Y. That's it. By doing so, the amount that inhibits the shrinkage by the joint portion 14 is reduced, so that the permanent strain during expansion and contraction is reduced, and the peel strength between the first sheet 11 and the second sheet 12 is high. It is preferable in terms. The length can be measured with a microscope.
Further, when the elastic members 13 are thread-shaped, it is preferable to provide one or more and five or less bonding portions 14 intermittently in the orthogonal direction Y between the elastic members 13 in the orthogonal direction Y. The joining strength between the first sheet 11 and the second sheet 12 can be increased by increasing the value obtained by adding the outer peripheral lengths of the respective joining portions 14.

From the viewpoint of improving the air permeability of the absorbent article, in the composite stretchable sheets 10A to 10C according to the first to third embodiments, at a position overlapping with the joint portion 14, or between the joint portions 14 adjacent to each other in the stretching direction X, It is preferable that an opening penetrating the composite elastic sheet is formed.

From the viewpoint of making it easy to stretch the composite stretch sheets 10A, 10B, and 10C according to the first to third embodiments in the stretch direction X, in the stretched elastic member 13, the diameter of the elastic member 13 is cyclic along the stretch direction X. It is preferable that they are changed. In the elastic member 13 whose diameter changes cyclically in this way, the elastic member 13 has a portion which is less likely to contract due to the influence of heat from the convex roll, and thus the portion becomes relatively thin, or a narrow pressure which will be described later. It is formed by making the part relatively thin.

The composite elastic sheet used in the absorbent article of the present invention is not limited to those of the above-described embodiments, and can be appropriately changed. Further, the respective constituent requirements of the composite stretchable sheets 10A to 10C according to the above-described embodiments can be appropriately combined and implemented within a range not impairing the gist of the present invention.

At least the first sheet 11 of the first and second sheets 11 and 12 forming the composite stretchable sheets 10A to 10C can be various fiber sheets including, for example, nonwoven fabric. As the non-woven fabric, for example, known non-woven fabrics such as spun-bonded non-woven fabric, thermal-bonded non-woven fabric (point-bonded non-woven fabric, heat-embossed non-woven fabric, air-through non-woven fabric, etc.), melt-blown non-woven fabric, resin-bonded non-woven fabric, etc. may be used without particular limitation. it can. In particular, spunbonded non-woven fabric mainly composed of polyethylene or polypropylene is preferable because it is easy to achieve both bonding strength and cushioning property. Each sheet 11, 12 that preferably has a basis weight of at independently 10 g / ^{m 2} or more, more preferably 12 g / ^{m 2} or more, more preferably 15 g / ^{m 2} or more. Further, it is preferably 100 g/m ² or less, more preferably 50 g/m ² or less, and further preferably 30 g/m ² or less.

As the second sheet 12, a resin film made of synthetic resin can be used in addition to the fiber sheet described above. Examples of the resin film include a film made of a polymer material such as polyethylene terephthalate, polyester, polyethylene, polypropylene, cellophane, nylon, polyvinyl alcohol, polyvinyl chloride, and polycarbonate, and a moisture permeable film. A polyethylene moisture permeable film or a polyether polyurethane moisture permeable film containing calcium carbonate is preferred as the moisture permeable back sheet.
If at least one of the first and second sheets 11 and 12 has a maximum elongation of 50% or more, preferably 100% or more, more preferably 140% or more, it is difficult to break during processing and has high strength. Is preferred in that For this, an unstretched film is used, or in the case of a non-woven fabric, a high density polyethylene (HDPE) or a linear low density polyethylene (LLDPE) is mainly used as an olefin elastomer (propylene, It is preferable to blend 10 to 30% by mass of an ethylene-based α-olefin elastomer obtained by copolymerizing one or more kinds of butene, octene and the like. It is preferable to blend 10 to 30% by mass of a propylene-based elastomer obtained by copolymerizing at least one of ethylene, butene, octene and the like and a polypropylene having low stereoregularity with isotactic homopolypropylene as a main component in the polypropylene-based portion. .. These may be used alone or as a composite fiber.

When each of the sheets 11 and 12 is a non-woven fabric, the fibers constituting the non-woven fabric are various thermoplastic resins such as polyolefin-based resins such as polyethylene, polypropylene and polybutene, polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate, nylon. Polyamide resin such as, vinyl resin such as polystyrene and polyvinyl chloride, acrylonitrile resin such as acrylic resin, methacryl resin, vinylidene resin, natural fiber cotton, pulp, biodegradable plastic such as polylactic acid, etc. be able to. Alternatively, a fiber is composed of a blend of two or more kinds of these resins, or a composite fiber (core-sheath type fiber, side-by-side type fiber, eccentric crimp having a combination of two or more kinds of these resins) is used. It is also possible to use core-sheath fibers or split fibers. It is also possible to use fibers obtained by adding a small amount of additives such as a fiber colorant, an antistatic agent, a lubricant, a lubricant and a hydrophilic agent to the fibers.

The elastic member 13 fixed between the two sheets 11 and 12 broadly includes elastic members that return an elongation of 25% or more when expanded by 50% in the expansion/contraction direction, and can be made of, for example, an elastic resin. As the elastic resin, the same one as that used for this type of elastic sheet can be used. For example, styrene-butadiene rubber, butadiene rubber, isoprene rubber, synthetic rubber such as neoprene rubber, natural rubber, EVA rubber, SIS (styrene-isoprene-styrene) rubber, SEBS (styrene-ethylene-butylene-styrene) rubber, SEPS (styrene) -Ethylene-propylene-styrene) rubber, stretchable polyolefins (such as the ethylene-based elastomer and the propylene-based elastomer), polyurethane, and the like. The shape is a sheet shape such as a film shape or a net shape, a thread-like string (flat rubber) having a cross section of a short shape, a square shape, a circular shape, a polygonal shape, or a multifilament type thread shape. Etc. can be used.

The fineness of the thread-like elastic member 13 is preferably 10 dtex or more, more preferably 150 dtex or more, and further preferably 300 dtex or more. It is preferably 1600 dtex or less, more preferably 1300 dtex or less, and further preferably 1000 dtex or less.

As the sheet-like elastic member 13, for example, a stretchable sheet described in JP-A-2008-179128, a stretchable nonwoven fabric described in JP-A-2004-244791, an elastic laminate described in JP-A-5-508359, The elastic laminate described in JP-T-2003-524534 can be used.

Next, a preferred method for manufacturing the composite elastic sheet 10A according to the first embodiment will be described with reference to FIGS. 6 to 9. The present manufacturing method includes (1) a first step of manufacturing a first sheet 11 having an uneven shape, and (2) a second step of manufacturing a second sheet 12 having an uneven shape in parallel with the first step. The process is roughly divided into (3) a third process of manufacturing the composite elastic sheet 10A by joining the first sheet 11 and the second sheet 12 together. FIG. 6 shows a manufacturing apparatus 20 for performing these steps.

As shown in FIG. 6, the manufacturing apparatus 20 includes a first convex roll 21 and a first shaping roll 25 that mesh with each other, and further includes a second convex roll 22 and a second shaping roll 26 that mesh with each other. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft. The first convex roll 21 and the second convex roll 22 are configured to come into contact with each other on the downstream side in the rotational direction of the meshing portion with the first shaping roll 25 and the meshing portion with the second shaping roll 26. .. As each roll, it is preferable to use one capable of transmitting the driving force while adjusting the phase to each roll shaft via a gear or the like. As a result, unnecessary pressure is not applied to the sheet member and the elastic member 13, so that the sheet is not compressed and is not hardened, and the elastic member 13 is not cut. Although it is easy to directly transmit the driving force to each roll by the meshing, the elastic member 13 is easily cut by the compression. Therefore, it is preferable to provide the void portion K1 described later.

As shown in FIG. 6, the first convex roll 21 is a concave-convex roll, and has a convex portion 21a and a concave portion 21b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 21a has, along the axial direction AD, a high-toothed tooth portion 21e with relatively high tooth depth and a low-toothed tooth portion 21c with relatively low tooth depth, alternately. The high-toothed tooth portion 21e and the low-toothed tooth portion 21c are regularly arranged along the circumferential direction of the first convex roll 21. A groove portion is formed between the high-toothed tooth portions 21e adjacent to each other in the circumferential direction to form a concave portion 21b. Similarly, a groove portion is also formed between the low tooth catch portions 21c adjacent to each other in the circumferential direction to form a concave portion 21b. As shown in FIG. 6, the length of the high tooth intake portion 21e along the axial direction AD is longer than the length of the low tooth engagement portion 21c along the axial direction AD. The length of the high tooth take-up portion 21e is substantially the same as the length W1 of the first large convex portion 1k of the first sheet 11 manufactured in the first step. The length of the low tooth cap portion 21c is substantially the same as the length W2 of the first small convex portion 1t of the first sheet 11 manufactured in the first step.

As shown in FIG. 6, the first convex roll 21 has a higher toothbrush of the high toothbrush portion 21e than the toothbrush of the low toothbrush portion 21c. The groove 21d extends all over the circumferential direction of the roll. The 1st convex roll 21 arranges 21 d of groove|channels at constant intervals along the axial direction AD. The length of the groove 21d along the axial direction AD is substantially the same as the length of the low tooth cap portion 21c along the axial direction AD. The pitch of the adjacent groove 21d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the first sheet 11 manufactured in the first step. The pitch of the groove 21d may be different. The pitch of the groove 21d is preferably 0.5 mm or more, more preferably 3 mm or more, preferably 30 mm or less, and more preferably 10 mm or less. Further, the elastic members 13 may not be located in all the grooves 21d, and there may be grooves 21d without the elastic members 13. The return strength of the elastic member 13 after extension need not be the same in each groove 21d, and one having a high return strength partially in the orthogonal direction Y can be used. In order to increase the return strength of the elastic member 13, an elastic member having a high fineness or an elastic member having a high basis weight may be used, the insertion ratio when supplying to the manufacturing apparatus 20 may be increased, polyurethane having a high molecular weight or hard resin may be used. This is possible by using polyurethane having more segment components than soft segment components. By doing so, the fitting property is excellent, and it is possible to prevent a slippage when worn and a gap between the body and the lek gather in lek gather. From the viewpoint of improving the shapeability of the concave-convex shape of the first sheet 11, the groove depth of the groove 21d (the height of the high toothed portion 21e of the first convex roll 21-the height of the low teeth of the first convex roll 21). It is preferable that the top height of the take-up portion 21c) be smaller than the meshing depth between the first convex roll 21 and the first shaping roll 25. The depth of the groove 21d may be the same or different.

As shown in FIG. 6, the first shaping roll 25 is a concave-convex roll, but unlike the first convex roll 21, does not have a groove extending over the entire area in the circumferential direction of the roll. The first shaping roll 25 is arranged on the upstream side of a position where the first convex roll 21 described later is abutted with the second convex roll 22. The first shaping roll 25 extends over the entire length of the first convex roll 21 in the axial direction AD. The first shaping roll 25 has a convex portion 25a and a concave portion 25b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 25a may be provided with a portion having a low tooth depth such as the low tooth depth portion 21c, but it is preferable not to provide such a portion in order to achieve high elongation. The concave portion 25b meshes with the convex portion 21a of the first convex roll 21, and the convex portion 25a meshes with the concave portion 21b of the first convex roll 21. The engagement depth is the first convex roll 21 and the first convex roll 21 when the high engagement tooth portion 21e of the first convex roll 21 and the convex portion 25a of the first shaping roll 25 are brought into contact with each other. It is defined as the amount of displacement of the distance between the axis centers of the shaping rolls 25. The lengths L1 and L2 along the above can also be changed depending on the engagement depth. Further, the diameter of the first convex roll 21 is made larger than that of the first shaping roll 25, or a rectangular shape or an inverted trapezoidal shape (in the direction of the tip end) in a cross-sectional shape perpendicular to the axial direction AD of the convex portion 25a of the first convex roll 21. Is preferable in that the sheet 11a that has entered the groove portion of the recess 21b is less likely to come off.

As shown in FIG. 6, the second convex roll 22 is a concave-convex roll having substantially the same configuration as the first convex roll 21, and has a convex portion 22a and a concave portion 22b that linearly extend in the axial direction AD on the peripheral surface thereof. ing. The convex portion 22a of the second convex roll 22 is arranged so as to abut the convex portion 21a of the first convex roll 21. The convex portion 22a has high toothed portions 22e and low toothed portions 22c alternately along the axial direction AD. A groove portion is formed between the high tooth catch portions 22e that are adjacent to each other in the circumferential direction to form a concave portion 22b. Similarly, a groove portion is also formed between the low tooth catch portions 21c adjacent to each other in the circumferential direction to form a concave portion 21b. The length of the high toothed portion 22e along the axial direction AD is substantially the same as the length W1 of the second large convex portion 2k of the second sheet 12 manufactured in the second step. The length of the low tooth cap portion 22c along the axial direction AD is substantially the same as the length W2 of the second small convex portion 2t of the second sheet 12 manufactured in the second step.

As shown in FIG. 6, the second convex roll 22 has a groove 22d that extends over the entire area in the circumferential direction of the roll, corresponding to the position of the low tooth catch portion 22c. The pitch of the adjacent groove 22d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the second sheet 12 manufactured in the second step. The pitch may be different. Further, the elastic members 13 may not be located in all the grooves 22d, and there may be grooves 22d without the elastic members 13. In the second convex roll 22, the position of the groove 22d does not coincide with the position of the groove 21d of the first convex roll 21, and between the adjacent groove 21d in the axial direction AD of the first convex roll 21. Correspondingly, line grooves 22d are arranged. From the viewpoint of improving the shapeability of the concave-convex shape of the second sheet 12, the groove depth of the groove 22d (the height of the high toothed portion 22e of the second convex roll 22-the top height of the second convex roll 22-the low teeth of the second convex roll 22) It is preferable that the height (top height of the bamboo portion 22c) is smaller than the meshing depth between the second convex roll 22 and the second shaping roll 26. The meshing depth is from the state where the high toothed portion 22e of the second convex roll 22 and the convex portion 26a of the shaping roll 26 are brought into contact with each other, and the second convex roll 22 and the shaping roll 26 are brought into a meshed state. It is defined as the amount of displacement of the distance between the axis centers of.

As with the first shaping roll 25, the second shaping roll 26, as shown in FIG. 6, does not have a groove extending over the entire area in the circumferential direction of the roll. The second shaping roll 26 is arranged on the upstream side of the position where the second convex roll 22 abuts the first convex roll 21. The second shaping roll 26 extends over the entire length of the second convex roll 22 in the axial direction AD. The second shaping roll 26 has a convex portion 26a and a concave portion 26b that linearly extend in the axial direction AD on the peripheral surface thereof. The concave portion 26b meshes with the convex portion 22a of the second convex roll 22, and the convex portion 26a meshes with the concave portion 22b of the second convex roll 22. In the manufacturing apparatus 20, the tooth depth of the convex portion 26 a is the same as that of the high tooth tooth portion 22 e of the second convex roll 22. The stretching ratio of the sheet in the first shaping roll 25 and the low toothbrush portion 21c or the second shaping roll 26 and the low toothbrush portion 22c may be 1 time, but is preferably 1.3 times or more, more preferably Is preferably 1.8 times or more in terms of high elongation at break and appropriate cushioning property. In order to obtain a sufficient maximum strength, the draw ratio is preferably 6 times or less. The draw ratio in the high tooth intake portion 22e is preferably 1.5 times or more, more preferably 2 times or more, from the viewpoint of having an appropriate cushioning property. Similarly, in order to obtain a sufficient maximum strength, the draw ratio is preferably 6 times or less. The draw ratio can be determined by the method described in JP-A-2016-151076. In addition, the angle of the downstream corner portion of the convex portion 26a in the roll rotation direction is larger than the angle of the downstream corner portion of the high toothed portion 22e in the roll rotation direction. It is preferable from the viewpoint of maintaining on the peripheral surface of the second shaping roll 26.

As shown in FIG. 6, using the manufacturing apparatus 20, the strip-shaped sheet 11a of the first sheet 11 is fed out from its original roll (not shown), and the strip-shaped sheet 11a is fed to the first convex roll 21 and the first shaping roll. Supply between 25 and. The amount of stretching of the first sheet 11 can be controlled by controlling the supply speed or tension. When supplying, it is preferable from the viewpoint of shapeability that the strip-shaped sheet 11a is supplied from the first convex roll 21 side and supplied along the peripheral surface of the first convex roll 21. While supplying the strip-shaped sheet 11a, the plurality of first elastic members 13a aligned in one direction are supplied between the first convex roll 21 and the first shaping roll 25. Between the 1st convex roll 21 and the 1st shaping roll 25, the 1st elastic member 13a is penetrated in the state arrange|positioned at the opposing surface side with the 1st shaping roll 25 in the strip|belt-shaped sheet 11a.

At the meshing portion between the convex portion 21a and the concave portion 21b of the first convex roll 21 and the convex portion 25a and the concave portion 25b of the first shaping roll 25, by stretching the strip-shaped sheet 11a at least along the roll rotation direction, the unevenness is obtained. The first step of manufacturing the shaped first sheet 11 is performed.

In the first step, as shown in FIG. 7, the high tooth take-up portion 21e of the first convex roll 21 and the concave portion 25b of the first shaping roll 25 are meshed with each other, and the concave portion 21b of the first convex roll 21 and the first convex roll 21 are engaged. The convex portion 25a of the shaped roll 25 comes into mesh with each other. Since both the high toothed portion 21e and the convex portion 25a have high tooth depth, the first large convex portion 1k forming the first convex portion 1a and the first large concave portion 1d forming the first concave portion 1b are formed. It In the state where the teeth of the high toothed portion 21e and the convex portion 25a are meshed with each other, the degree of stretching of the belt-shaped sheet 11a is large, and the main stretched portion of the belt-shaped sheet 11a is the tip surface of the high toothed tooth portion 21e and the convex portion 25a. It becomes the area between the tip surface. In the first sheet 11, the distance between the fiber fixing portions that fix the fibers forming the first sheet 11 is relatively large between the top of the first large convex portion 1k and the bottom of the first large concave portion 1d. A long second region 17 is formed. In addition, the tip surface of the high-take portion 21e and the tip surface of the convex portion 25a are difficult to be stretched, and the distance between the fiber fixing portions is relatively large at the top portion of the first large convex portion 1k and the bottom portion of the first large concave portion 1d. A short first region 16 is formed.

In the first step, as shown in FIG. 8, each of the first elastic members 13a is supplied to the position corresponding to the groove 21d extending in the circumferential direction of the first convex roll 21, and is rotated in the rotation direction of the first convex roll 21. Stretched along. The teeth of the low toothbrush portion 21c of the first convex roll 21 are located in the groove 21d, but the toothbrush of the low toothbrush portion 21c is more than the toothbrush of the high toothbrush portion 21e and the toothbrush 25a. Is also low. Therefore, each first elastic member 13a is also stretched by the low toothbrush portion 21c, but it is difficult to cut due to the stretching. As described above, the first elastic member 13a is stretched in two stages, that is, stretching is performed when the elastic member 13a is wound from a wound state and is supplied to the apparatus 20, and stretching is performed by the low tooth portion 21c. Since it has passed, it becomes easy to extend in the extension direction. The strip-shaped sheet 11a is stretched in a state in which the first elastic member 13a is hard to be cut, and the first small convex portions 1t that form the first convex portion 1a and the first small concave portions 1s that form the first concave portion 1b are formed. It At the portion of the strip-shaped sheet 11a where the first elastic member 13a is arranged, the low tooth take-up portion 21c of the first convex roll 21 and the convex portion 25a of the first shaping roll 25 come to mesh with each other. Even if the teeth mesh with each other, the degree of stretching of the belt-shaped sheet 11a is small. In the first sheet 11, the second region 17 is formed between the top of the first small protrusion 1t and the bottom of the first small recess 1s. Further, the tip surface of the low tooth bush portion 21c and the tip surface of the convex portion 25a are difficult to be stretched, and the first regions 16 are formed at the top portion of the first small convex portion 1t and the bottom portion of the first small concave portion 1s, respectively.

In the first sheet 11, the second region 17 having a long distance between the fiber fixing portions is formed between the top of the first large convex portion 1k and the bottom of the first large concave portion 1d, and the first small convex portion is formed. It is formed between the top of the portion 1t and the bottom of the first small recess 1s. The first large convex portions 1k and the first small convex portions 1t are alternately arranged in the roll axial direction, and the first large concave portions 1d and the first small concave portions 1s are also alternately arranged in the roll axial direction. The second region 17 is formed so as to extend in the roll axis direction which is a direction orthogonal to the extending direction of the first elastic member 13a.
Similarly, in the first sheet 11, the first regions 16 having a short distance between the fiber fixing portions are formed on the top of the first large convex portion 1k and the bottom of the first large concave portion 1d, respectively, and the first small portion is formed. It is formed on the top of the protrusion 1t and the bottom of the first small recess 1s, respectively. The first large convex portions 1k and the first small convex portions 1t are alternately arranged in the roll axial direction, and the first large concave portions 1d and the first small concave portions 1s are alternately arranged in the roll axial direction. Therefore, the first region 16 is formed so as to extend in the roll axis direction which is a direction orthogonal to the extending direction of the first elastic member 13a.

In the first step, as shown in FIG. 6, by the tension of each first elastic member 13 a extending in the rotation direction of the first convex roll 21, the unevenly shaped first sheet 11 is moved to the first convex roll 21. While being pressed onto the peripheral surface, it is conveyed to the next third process. By restraining the sheet 11 on the convex roll 21 by the elastic member 13a, the sheet 11 can be prevented from floating from the roll 21, and wrinkles and the like can be prevented from entering the sheet at the joint portion. Therefore, it is preferable that a plurality of elastic members 13 are used to hold the sheet 11 at a plurality of locations.

Separately from the production of the first sheet 11 having the uneven shape, as shown in FIG. 6, the strip-shaped sheet 12a of the second sheet 12 is unwound from its original roll (not shown) to form the strip-shaped sheet 12a into the second sheet. It is supplied between the convex roll 22 and the second shaping roll 26. When supplying, it is preferable from the viewpoint of shapeability that the strip-shaped sheet 12a is supplied from the second convex roll 22 side and supplied along the peripheral surface of the second convex roll 22. While supplying the belt-shaped sheet 12a, the plurality of second elastic members 13b aligned in one direction are supplied between the second convex roll 22 and the second shaping roll 26. Between the 2nd convex roll 22 and the 2nd shaping roll 26, the 2nd elastic member 13b is made to pass in the state arrange|positioned at the opposing surface side with the 2nd shaping roll 26 in the strip|belt-shaped sheet 12a.

In parallel with the first step, at the meshing portion between the convex portion 22a and the concave portion 22b of the second convex roll 22 and the convex portion 26a and the concave portion 26b of the second shaping roll 26, the strip-shaped sheet 12a is at least in the roll rotation direction. The second step of manufacturing the unevenly shaped second sheet 12 is performed by stretching along the above.

In the second step, the high tooth take-up portion 22e of the second convex roll 22 and the concave portion 26b of the second shaping roll 26 are engaged with each other, and the concave portion 22b of the second convex roll 22 and the convex portion 26a of the second shaping roll 26 are engaged. And will be engaged. Since both the high toothed portion 22e and the convex portion 26a have a high tooth depth, the second large convex portion 2k forming the second convex portion 2a and the second large concave portion 2d forming the second concave portion 2b are formed. It In the state where the teeth of the high toothed portion 22e and the convex portion 26a are meshed with each other, the degree of stretching of the belt-shaped sheet 12a is large, and the main stretched portion of the belt-shaped sheet 12a is the tip surface of the high toothed tooth portion 22e and the convex portion 26a. It becomes the area between the tip surface. In the second sheet 12, the distance between the fiber fixing portions that fix the fibers forming the second sheet 12 is relatively large between the top of the second large convex portion 2k and the bottom of the second large concave portion 2d. A long second region 17 is formed. In addition, the tip surface of the high-take portion 22e and the tip surface of the convex portion 26a are not easily stretched, and the distance between the fiber fixing portions is relatively large at the top of the second large convex portion 2k and the bottom of the second large concave portion 2d. A short first region 16 is formed.

In the second step, each second elastic member 13b is supplied to a position corresponding to the groove 22d extending in the circumferential direction of the second convex roll 22, and is extended along the rotation direction of the second convex roll 22. The teeth of the low toothed portion 22c of the second convex roll 22 are located in the groove 22d, but the toothed portion of the low toothed portion 22c is more than the toothed portion of the high toothed portion 22e and the toothed portion 26a. Is also low. Therefore, each second elastic member 13b is also stretched by the low tooth cap portion 22c, but is difficult to be cut due to the stretching. As described above, the second elastic member 13b is stretched in two stages, that is, the stretching that is draw-stretched when the elastic member 13b is wound from the wound state and is supplied to the device 20 and the stretching by the low tooth portion 22c. Since it has passed, it becomes easy to extend in the extension direction. The strip-shaped sheet 12a is stretched in a state in which the second elastic member 13b is hard to be cut, and the second small convex portion 2t forming the second convex portion 2a and the second small concave portion 2s forming the second concave portion 2b are formed. It At the portion of the belt-shaped sheet 12a where the second elastic member 13b is arranged, the low tooth take-up portion 22c of the second convex roll 22 and the convex portion 26a of the second shaping roll 26 come to mesh with each other. Even if the teeth mesh with each other, the degree of stretching of the belt-shaped sheet 12a is small. In the second sheet 12, the second region 17 is formed between the top of the second small protrusion 2t and the bottom of the second small recess 2s. In addition, the tip surface of the low toothed portion 22c and the tip surface of the convex portion 26a are difficult to stretch, and the first regions 16 are formed at the top of the second small convex portion 2t and the bottom of the second small concave portion 2s, respectively. Non-extending elongation is the amount of meshing between the low-toothed tooth portion 21c and the convex portion 25a of the first shaping roll 25, or the amount of meshing between the low-toothed tooth portion 22c and the convex portion 26a of the second shaping roller 26 and the sheet. It is adjusted depending on the lower draw ratio, depending on the drawing tension based on the insertion tension.

In the second sheet 12, the second region 17 having a long distance between the fiber fixing portions is formed between the top of the second large convex portion 2k and the bottom of the second large concave portion 2d, and the second small convex portion is formed. It is formed between the top of the portion 2t and the bottom of the second small recess 2s. The second large convex portions 2k and the second small convex portions 2t are alternately arranged in the roll axial direction, and the second large concave portions 2d and the second small concave portions 2s are also alternately arranged in the roll axial direction. The second region 17 is formed so as to extend in the roll axis direction which is a direction orthogonal to the extending direction of the second elastic member 13b.

In the second step, as shown in FIG. 6, the second sheet 12 unevenly shaped by the tension of each second elastic member 13 b extending in the rotation direction of the second convex roll 22 is transferred to the second convex roll 22. While being pressed onto the peripheral surface, it is conveyed to the next third process. By restraining the sheet 12 on the convex roll 22 by the elastic member 13b, it is possible to prevent the sheet 12 from floating from the roll 22, and to prevent wrinkles from entering the sheet at the joint portion. Therefore, it is preferable that a plurality of elastic members 13 are used to hold down the sheet 12 at a plurality of locations.

In the third step, as shown in FIG. 6, the separately manufactured unevenly shaped first sheet 11 and unevenly shaped second sheet 12 are arranged such that the arrangement surfaces of the elastic members 13a and 13b face each other. Overlaid on. Then, as shown in FIG. 9, the first sheet 11 and the second sheet 12 that have been overlapped with each other are provided with a high-toothed tooth portion 21 e that constitutes the convex portion 21 a of the first convex roll 21 and a convex portion of the second convex roll 22. 22a is joined by abutment with the high-take tooth portion 22e. The second convex roll 22 is pressed against the first convex roll 21. When joining by heat fusion, at least one of the first convex roll 21 and the second convex roll 22 is heated. In order to obtain a higher bonding strength of the bonding portion 14, it is preferable to heat both the rolls 21 and 22. The heating temperature is preferably 10° C. lower than the melting point of the constituent resin having the lowest melting point. Thereby, it is possible to prevent the sheet 11 and the sheet 12 from sticking to the roll while maintaining the bonding strength of the bonding portion 14. Also in the first shaping roll 25 and the second shaping roll 26, from the viewpoint of preventing tearing of the sheet at a high speed, and preheating the sheet to prevent cutting of fibers at the joining portion 14 and the interface at the time of stretching, joining From the viewpoint of increasing strength, it is preferable to heat. It is preferable that the heating temperature is lower than the crystallization temperature of the resin having the lowest melting point of the constituent resin, because the joint portion 14 does not become hard.

More specifically, as shown in FIG. 9A, in the third step, the position of the groove 21d of the first convex roll 21 and the position of the groove 22d of the second convex roll 22 are aligned in the axial direction AD. Since this is not done, the first elastic member 13a supplied to the groove 21d and the second elastic member 13b supplied to the groove 22d do not overlap in the roll axial direction. When the convex portion 21a of the first convex roll 21 and the convex portion 22a of the second convex roll 22 are butted, the first elastic member 13a supplied to the groove 21d of the first convex roll 21 is the second convex roll. The high-toothed tooth portion 22e of 22 and the groove 21d of the first convex roll 21 pass through the gap portion K1 formed along the roll rotation direction. Then, the second elastic member 13b supplied to the groove 22d of the second convex roll 22 is moved along the roll rotation direction by the high tooth take-up portion 21e of the first convex roll 21 and the groove 22d of the second convex roll 22. Through the void portion K1 formed as a result. Therefore, the first elastic member 13a and the second elastic member 13b are not cut by the butting of the convex portion 21a of the first convex roll 21 and the convex portion 22a of the second convex roll 22.

In the third step, as shown in FIG. 9, the high-toothed tooth portions 22e of the second convex roll 22 and the high-toothed tooth portions 21e and 21e located on both sides of the groove 21d of the first convex roll 21 are overlapped with each other. Joining portions 14 are formed on both sides of the first elastic member 13a disposed between the first sheet 11 and the second sheet 12 in the roll axial direction AD, and the first sheet 11 and the second sheet 12 are joined. To do. At the same time, the first toothed portion 21e and the second toothed portion 21e of the first convex roll 21 and the second toothed portions 22e and 22e of the second convex roll 22 located on both sides of the groove 22d of the second convex roll 22 are overlapped with each other. Joining portions 14 are formed on both sides of the second elastic member 13b arranged between the sheet 12 and the sheet 12 in the roll axis direction AD, and the first sheet 11 and the second sheet 12 are joined together. In this way, the target composite elastic sheet 10A is efficiently manufactured. The composite stretchable sheet 10A has stretchability in the MD direction, which is the machine direction during manufacturing.

In order to set the value of P2/P1 which is the ratio of the pitch P2 of the adjacent joints 14 to the value P1 obtained by doubling the repeating pitch of the first region 16 to 2 or more, the high teeth of the first convex roll 21 should be applied. The heights of the portions 21e are set to be every several heights in the rotation direction, and high-toothed gear portions 21e (meaning that the distance from the axis center to the top of the convex portion is long) higher than other high-toothed gear portions 21e are provided. Thereby, it is possible to join between the high tooth take-up portion 21e and the high tooth take-up portion 22e of the second convex roll 22. The high toothed portion 22e of the second convex roll 22 may be similarly formed.
The ratio (P12/P11) or (P11/P12) of the value P11 obtained by doubling the repeating pitch of the first region 16 of the first sheet 11 and the value P21 obtained by doubling the repeating pitch of the first region 16 of the second sheet 12. ), the pitch P1′ in the MD direction of the convex portions 21a of the first convex roll 21 and the pitch P2′ in the MD direction of the convex portions 22a of the second convex roll 22 are changed to (P1′/P2′) or ( The ratio of (P2'/P1') is an integral multiple. The pitches P1′ and P2′ are the pitches of the convex portions and mean the pitch length on the roll at the meshing center diameter (PCD) between the convex portions and the convex portions during meshing.

In the composite stretchable sheet 10A, in order to form the joining region 19 for fixing the both end portions 3a of the elastic member 13, in a subsequent step, for example, a pair of convex rolls having convex portions extending in the roll axial direction on the peripheral surface are arranged. It can be formed by introducing it into the contact portion between the convex portions of the convex roll. Alternatively, both ends 3a of the elastic member 13 may be fixed between the sheets 11 and 12 with an adhesive to form the joint region 19.

Instead of fixing only the both end portions 3a of the first elastic member 13a and the second elastic member 13b in the joining region 19, the first elastic member 13a and the second elastic member 13b are arranged at intervals along the MD direction. You may make it fix to the 1st sheet|seat 11 and the 2nd sheet 12 by pinching between the joined parts 14 and 14 which were formed, and the both ends 3a of the 1st elastic member 13a and the 2nd elastic member 13b are the joining area|region 19. In addition to fixing, the first elastic member 13a and the second elastic member 13b may be fixed to the first sheet 11 and the second sheet 12 by being sandwiched between the joint portions 14 and 14, respectively. When fixing the first elastic member 13a and the second elastic member 13b by sandwiching them between the joint portions 14 and 14, respectively, the high tooth bush portions 21e and 21e located on both sides of the groove 21d of the first convex roll 21 The interval is shortened, and the interval between the high tooth take-up portions 22e, 22e located on both sides of the groove 22d of the second convex roll 22 is shortened. The joint portions 14, 14 on both sides of the elastic members 13a, 13b may be formed adjacent to the elastic members 13a, 13b, and a plurality of joint portions 14, 14 may be formed along the extending/contracting direction. This makes it possible to prevent the elastic member 13 from coming off from the composite elastic sheet 10A by the elastic member 13 being pinched by the joint portions 14, 14. Clamping pressure expands the cross-sectional area in the radial direction when the elastic members 13a and 13b are extended and then returns in length, and surrounds the expanding member and the elastic member 13 formed by the sheet between the joints 14 in response to the expanding force. The forces are balanced and a high frictional force is generated between the elastic member 13 and the sheet. Thereby, the elastic member 13 is fixed to the seat. Furthermore, it is preferable that the elastic member 13 is fused at the same time as the pressing force, because the elastic member 13 is more difficult to come off from the first sheet 11 or the second sheet 12.

In the first convex roll 21 or the second convex roll 22, it is preferable to provide an auxiliary concave-convex roll in a state in which the composite elastic sheet 10A is wound around one of the rolls in addition to the joining by the butting between the rolls (described later). 15(a) corresponding to the position of the roll 55). As the auxiliary concave-convex roll, for example, in the case where additional joining is performed on the downstream side of the first convex roll 21, the auxiliary convex-concave roll has a shape such as the second convex roll 22 having a groove in the portion where the elastic member 13 is located, or the rotation. For example, there may be mentioned one having protrusions extending along the direction at a position other than the portion where the elastic member 13 is located at a constant interval in the axial direction AD. The 1st sheet|seat 11 and the 2nd sheet|seat 12 are joined by the convex parts of the 1st convex roll 21 and the auxiliary|assistant uneven|corrugated roll being stuck. The downstream joining position may be the same as or different from the upstream joining position, but it is preferable that at least some of them overlap. As a result, strong joining can be performed before the temperature of the upstream joining portion decreases. In addition, since the composite elastic sheet 10A is not wound around the auxiliary uneven roll, the auxiliary uneven roll can be higher than the temperature of the first convex roll 21. As still another method, the projections extending along the rotation direction are provided at a constant interval in the axial direction AD so as to coincide with the position of the low toothed portion 21c (corresponding to the position of the elastic member 13). It is also possible to press the auxiliary concave-convex roll (having a shape as shown by the roll 55 in FIG. 15A) while pressing it through the composite elastic sheet 10A to the extent that the elastic member 13 is not cut. The first convex roll 21 is provided with a low tooth bush 21c at all elastic member 13 positions. At this time, the axial cross section of the groove portion is shaped to open in a trapezoidal shape toward the outside of the roll, and the axial cross section of the convex portion of the auxiliary concave-convex roll is trapezoidal so that the tip portion becomes thin so as to mesh with this. Preferably. As a result, the first sheet 11 and the second sheet 12 are joined on the side surface of the convex portion of the auxiliary concave-convex roll.

Further, by narrowing the space between the joints between the convex side surfaces adjacent to each other in the axial direction AD of the roll, the elastic member 13 is pinched between the joints 14 and 14, and the elastic member 13 is held between the first sheet 11 and the second sheet. It can be fixed between 12. Furthermore, the trapezoidal shape is adjusted by adjusting the spatial cross-sectional area formed by the top of the low toothbrush portion 21c and the top of the convex portion of the auxiliary concave-convex roll (when the length of the trapezoidal top side of the convex portion of the auxiliary concave-convex roll is shortened, the spatial sectional area is reduced. It is also preferable that the smaller the angle of the top side of the trapezoid, the smaller the spatial cross-sectional area. As a result, when the convex portion of the auxiliary concave-convex roll is pushed into the groove portion of the first convex roll 21, the elastic member 13 is pushed to such an extent that it is difficult to cut and compressively deforms. Then, the first sheet 11 or the second sheet 12 and the elastic member 13 are fused at the top of the convex portion of the auxiliary concave-convex roll, and the elastic member 13 becomes more difficult to come off.

In the manufacturing apparatus 20 that manufactures the composite stretchable sheet 10A, instead of the first convex roll 21 and the first shaping roll 25, and the second convex roll 22 and the second shaping roll 26, JP2008-289659A. 6 may be used, and the first embossing roll 11 and the second embossing roll 12 shown in FIG. 6 of WO 2010/119535 pamphlet may be used. May be. In the first roll 5 and the second roll 6 of JP 2008-289659 A, the first roll 5 has a cylindrical convex portion 51 on its peripheral surface, and the second roll 6 has its peripheral surface. Has a concave portion 61 corresponding to the position of the convex portion 51, so that the first roll 5 and the second roll 6 can be loosely inserted without the convex portion 51 coming into contact with the inner surface of the concave portion 61. ing. In addition, when the convex portion 51 is loosely inserted in the concave portion 61, a void portion for allowing the elastic member to pass is formed between the convex portions 51 adjacent in the axial direction. In addition, in the first embossing roll 11 and the second embossing roll 12 of International Publication No. 2010/119535 pamphlet, the first embossing roll 11 has a convex portion 15 protruding outward from the smooth surface 14 and a concave portion from the surface 14. The second embossing roll 12 has a convex portion 18 protruding outward from the smooth surface 17 and a concave portion 19 recessed from the surface 17, and the first embossing roll 11 and the second embossing roll 11 In the two-embossing roll 12, the convex part 18 of the second embossing roll 12 meshes with the concave part 16 of the first embossing roll 11, and the convex part 15 of the first embossing roll 11 meshes with the concave part 19 of the second embossing roll 12. ing. Further, when they are meshed with each other, a gap is formed between the convex portion 15 and the convex portion 18 which are adjacent to each other in the axial direction, through which the elastic member passes.

When supplying the elastic member 13 to the manufacturing apparatus 20, it is preferable to position the elastic member 13 in advance in the axial direction AD in order to pass the elastic member 13 through the groove. To position the elastic member 13, a roll having V-shaped grooves is used, and the elastic member 13 is wound in an S shape by using one or more grooved rolls, and the groove angle is gradually increased. Narrow (decrease the tip angle of the groove). This is preferable because the position of the elastic member 13 does not swing in the axial direction AD.

Next, a suitable method for manufacturing the composite elastic sheet 10B according to the second embodiment will be described with reference to FIGS. 10 to 11. Regarding the method for manufacturing the composite stretchable sheet 10B, constituent parts that are different from the method for manufacturing the composite stretchable sheet 10A according to the first embodiment will be described, and the same constituent parts will be given the same reference numerals and description thereof will be omitted. The points that are not particularly described are the same as the manufacturing method of the composite elastic sheet 10A, and the description of the manufacturing method of the composite elastic sheet 10A is applied as appropriate.

The method for manufacturing the composite stretchable sheet 10B includes (1) a first step of manufacturing a first sheet 11 having an uneven shape, and (2) a second sheet 12 having an uneven shape formed in parallel with the first step. It is roughly divided into a second step of manufacturing and (3) a third step of manufacturing the composite elastic sheet 10A by joining the first sheet 11 and the second sheet 12. FIG. 10 shows a manufacturing apparatus 20A for performing these steps.

As shown in FIG. 10, the manufacturing apparatus 20A includes a first convex roll 21A and a first shaping roll 25 that mesh with each other, and further includes a second convex roll 22A and a second shaping roll 26 that mesh with each other. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft. The first convex roll 21A and the second convex roll 22A come into contact with each other on the downstream side in the rotational direction of the meshing portion with the first shaping roll 25 and the meshing portion with the second shaping roll 26. .

The configurations of the first shaping roll 25 and the second shaping roll 26 are the same as the configurations of the first shaping roll 25 and the second shaping roll 26 of the manufacturing apparatus 20, respectively. The configurations of the first convex roll 21A and the second convex roll 22A are substantially the same as the configurations of the first convex roll 21 and the second convex roll 22A of the manufacturing apparatus 20, respectively. As shown in FIG. 11, the first convex roll 21A has a larger number of the low tooth bush portions 21c of the convex portion 21a as compared with the first convex roll 21 of the manufacturing apparatus 20, and corresponds to the position of the low tooth bush portion 21c. It has a lot of groove 21d. Unlike the second convex roll 22 of the manufacturing apparatus 20, the second convex roll 22A does not have a line groove extending over the entire area in the circumferential direction of the roll, and the convex portion that extends linearly in the axial direction AD on the circumferential surface thereof. 22a and a recess 22b.

The first convex roll 21A has a suction hole (not shown) at the bottom of the concave portion 21b. The suction hole (not shown) communicates with a suction source (not shown) such as a blower or a vacuum pump, and as shown in FIG. The suction portion 21f up to a position below the first convex roll 21A is controlled so that suction is performed from the peripheral surface of the first convex roll 21A toward the inside.

The second convex roll 22A has a suction hole (not shown) at the bottom of the concave portion 22b. The suction hole (not shown) communicates with a suction source (not shown) such as a blower or a vacuum pump, and as shown in FIG. The suction portion 22f up to the contact portion with the first convex roll 21A is controlled so that suction is performed from the peripheral surface of the second convex roll 22A toward the inside.

Using the manufacturing apparatus 20A, as shown in FIG. 10, the original strip-shaped sheet 12a before becoming the second sheet 12 is fed out from its original roll (not shown), and the strip-shaped sheet 12a is changed to the first convex roll 21A. It is supplied between the first shaping roll 25. At the meshing portion of the convex portion 21a and the concave portion 21b of the first convex roll 21A and the convex portion 25a and the concave portion 25b of the first shaping roll 25, by stretching the strip-shaped sheet 12a at least along the roll rotation direction, the unevenness is obtained. The first step of manufacturing the shaped second sheet 12 is performed.

In the first step, the high tooth catch portion 21e of the first convex roll 21A and the concave portion 25b of the first shaping roll 25 are engaged with each other, and the concave portion 21b of the first convex roll 21A and the convex portion 25a of the first shaping roll 25 are meshed. And will be engaged. Since both the high toothed portion 21e and the convex portion 25a have high tooth depth, the first large convex portion 1k forming the first convex portion 1a and the first large concave portion 1d forming the first concave portion 1b are formed. It In the second sheet 12, a second region 17 having a relatively long distance between the fiber fixing portions is formed between the top of the first large convex portion 1k and the bottom of the first large concave portion 1d. Moreover, the 1st area|region 16 with which the distance between fiber fixing parts is relatively short is formed in the top part of the 1st large convex part 1k, and the bottom part of the 1st large concave part 1d, respectively.

In the first step, the teeth of the low toothbrush portion 21c are located in the groove 21d of the first convex roll 21A, but the degree of stretching of the belt-shaped sheet 12a is small. In the second sheet 12, the second region 17 is formed between the top of the first small convex portion 1t and the bottom of the first small concave portion 1s. Further, the tip surface of the low tooth bush portion 21c and the tip surface of the convex portion 25a are difficult to be stretched, and the first regions 16 are formed at the top portion of the first small convex portion 1t and the bottom portion of the first small concave portion 1s, respectively.

In the first step, the uneven second sheet 12 is sucked inward from the peripheral surface of the roll via the suction holes (not shown) in the suction portion 21f of the first convex roll 21A to form the first convex roll. It is held on the roll peripheral surface of 21A. The uneven second sheet 12 is conveyed to the third step, which is the next step, while being maintained in a shape along the uneven shape of the first convex roll 21A.

Apart from the production of the second sheet 12, as shown in FIG. 10, the original strip-shaped sheet 11a before becoming the first sheet 11 is unwound from its original roll (not shown) to form the strip-shaped sheet 11a into the second sheet. It is supplied between the convex roll 22A and the second shaping roll 26. In parallel with the first step, the strip-shaped sheet 11a is formed at least in the roll rotation direction at the meshing portion between the convex portion 22a and the concave portion 22b of the second convex roll 22A and the convex portion 26a and the concave portion 26b of the second shaping roll 26. The second step of manufacturing the first sheet 11 having the uneven shape by performing stretching along the second step is performed.

In the second step, the convex portion 22a of the second convex roll 22A and the concave portion 26b of the second shaping roll 26 are engaged with each other, and the concave portion 22b of the second convex roll 22A and the convex portion 26a of the second shaping roll 26 are The first sheet 11 having the second convex portions 2a and the second concave portions 2b is engaged with each other to be manufactured. In the first sheet 11, a second region 17 having a relatively long distance between the fiber fixing portions is formed between the top of the second protrusion 2a and the bottom of the second recess 2b. Moreover, the 1st area|region 16 with which the distance between fiber fixing|fixed parts is relatively short is formed in the top part of the 2nd convex part 2a, and the bottom part of the 2nd recessed part 2b, respectively.

In the second step, the first sheet 11 having an uneven shape is sucked inward from the peripheral surface of the roll by the suction portion 22f of the second convex roll 22A through the suction holes (not shown), and the second convex roll is formed. 22A is held on the peripheral surface of the roll. The first sheet 11 having an uneven shape is conveyed to the third step, which is the next step, while being maintained in a shape along the uneven shape of the second convex roll 22A.

In the third step, as shown in FIG. 10, separately manufactured unevenly shaped first sheet 11 and unevenly shaped second sheet 12 are aligned in one direction between the sheets. In addition, the plurality of elastic members 13 are overlapped with each other. The elastic member 13 is supplied between the surface of the first sheet 11 that does not face the first convex roll 21A and the surface of the second sheet 12 that does not face the second convex roll 22A, and the first convex roll 21A. Is supplied to a position corresponding to the groove 21d extending in the circumferential direction, and is extended along the rotation direction of the first convex roll 21A. As shown in FIG. 11( a ), when the convex portion 21 a of the first convex roll 21 and the convex portion 22 a of the second convex roll 22 are abutted against each other, the elasticity supplied to the groove 21 d of the first convex roll 21. The member 13 is passed through the gap K1 formed by the convex portion 22a of the second convex roll 22 and the groove 21d of the first convex roll 21 along the roll rotation direction. The teeth of the low toothbrush portion 21c of the first convex roll 21A are located in the groove 21d, but the toothbrush of the low toothbrush portion 21c is lower than that of the high toothbrush portion 21e. is there. Therefore, the elastic member 13 is unlikely to be cut due to the stretching force.

In the third step, as shown in FIG. 11( b ), by the convex portion 22 a of the second convex roll 22 and the high tooth take-up portions 21 e, 21 e located on both sides of the groove 21 d of the first convex roll 21, The joint portions 14 are formed on both sides of the elastic member 13 arranged between the first sheet 11 and the second sheet 12 which are overlapped, and the first sheet 11 and the second sheet 12 are joined. In this way, the intended composite elastic sheet 10B is manufactured.

Next, a suitable method for manufacturing the composite elastic sheet 10C according to the third embodiment will be described with reference to FIGS. 12 to 13. Regarding the method for manufacturing the composite stretchable sheet 10C, constituent parts that are different from the method for manufacturing the composite stretchable sheet 10A according to the first embodiment will be described, and the same constituent parts will be given the same reference numerals and description thereof will be omitted. The points that are not particularly described are the same as the manufacturing method of the composite elastic sheet 10A, and the description of the manufacturing method of the composite elastic sheet 10A is applied as appropriate.

The method for manufacturing the composite stretchable sheet 10C includes (1) a laminated sheet 10J in which the strip-shaped sheet 11a of the first sheet 11 and the strip-shaped sheet 12a of the second sheet 12 are joined together with the elastic member 13 disposed therebetween. And a second step of (2) manufacturing the composite stretchable sheet 10C by shaping the laminated sheet 10J in a concavo-convex shape. FIG. 12 shows a manufacturing apparatus 30 for performing these steps.

As shown in FIG. 12, the manufacturing apparatus 30 includes a convex roll 31, a joining roll 32 arranged on the peripheral surface of the convex roll 31, and a joining roll 32 arranged on the peripheral surface of the convex roll 31 and downstream of the joining roll 32 in the rotation direction. And a shaping roll 35 disposed on the side. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft. It is preferable to use the ultrasonic horn 45 shown in FIG. 3 of JP-A-2018-099793 instead of the bonding roll 32 in order to obtain a high bonding strength. Further, instead of the convex roll 31 and the shaping roll 35, a first roll 5 and a second roll 6 described in FIG. 6 of JP 2008-289659 A and a diagram of International Publication No. 2014/038578 pamphlet. The first embossing roll 11 and the second embossing roll 12 described in 6 may be used.

The configuration of the convex roll 31 is substantially the same as the configuration of the first convex roll 21 of the manufacturing apparatus 20. The convex roll 31 is a concave-convex roll, and has a convex portion 31a and a concave portion 31b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 31a alternately has a high-toothed tooth portion 31e and a low-toothed tooth portion 31c along the axial direction AD. As shown in FIG. 13, the length of the high tooth intake portion 31e in the axial direction AD is longer than the length of the low tooth engagement portion 31c in the axial direction AD. The length of the high-toothed tooth portion 31e matches the length of the joint portion 14 in the manufactured composite stretchable sheet 10C in the orthogonal direction Y. A row groove 31d is formed on the convex roll 31 at a position corresponding to the low tooth catch portion 31c, and the row groove 31d extends over the entire area in the circumferential direction of the roll. The pitch of the adjacent groove grooves 31d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the manufactured composite stretch sheet 10C.

As shown in FIG. 12, the joining roll 32 is a flat roll and extends over the entire length of the convex roll 31 in the axial direction AD.

The configuration of the shaping roll 35 is substantially the same as the configuration of the first shaping roll 25 of the manufacturing apparatus 20. As shown in FIG. 12, the shaping roll 35 is a concavo-convex roll, but does not have a groove extending all over the circumferential direction of the roll. The shaping roll 35 extends over the entire length of the convex roll 31 in the axial direction AD. The shaping roll 35 has a convex portion 35a and a concave portion 35b. The tooth depth of the convex portion 35 a is the same as that of the high tooth tooth portion 31 e of the convex roll 31. The concave portion 35b meshes with the convex portion 31a of the convex roll 31, and the convex portion 35a meshes with the concave portion 31b of the convex roll 31.

Using the manufacturing apparatus 30, as shown in FIG. 12, the strip-shaped sheet 11a of the first sheet 11 and the strip-shaped sheet 12a of the second sheet 12 are fed out from their original rolls (not shown). Along with that, the contact portion between the convex roll 31 and the joining roll 32 in a state in which a plurality of first elastic members 13a aligned in one direction are arranged between the strip-shaped sheet 11a and the strip-shaped sheet 12a. Supply to. When supplying, it is preferable to supply the strip-shaped sheets 11a and 12a from the convex roll 31 side and supply along the peripheral surface of the convex roll 31 from the viewpoint of improving the bonding strength. Each elastic member 13 is supplied to a position corresponding to a groove 31d extending in the circumferential direction of the convex roll 31, and is extended along the rotation direction of the convex roll 31. The elastic member 13 supplied to the groove 31d is not cut even if the apex of the high tooth take-up portion 31e forming the convex portion 31a of the convex roll 31 comes into contact with the joining roll 32. Before disposing the adhesive applying section 70 and disposing the first elastic member 13a between the strip-shaped sheets 11a and 12a, the adhesive is applied to the first elastic member 13a at intervals in the MD direction. You may work.

Then, as shown in FIGS. 12 and 13, by the surface of the joining roll 32 and the high tooth take-up portions 31e, 31e located on both sides of the groove 31d of the convex roll 31, the elastic member 13 in the roll axial direction AD The first step of manufacturing the laminated sheet 10J by forming the joint portions 14 on both sides and joining the strip-shaped sheet 11a and the strip-shaped sheet 12a is performed. The joining portions 14 are arranged on both sides of each elastic member 13 in the laminated sheet 10J, and are regularly formed at regular intervals along the rotation direction of the convex roll 31.

Next, as shown in FIG. 12, the laminated sheet 10J having the joint portion 14 formed therein is introduced into the meshing portion between the convex roll 31 and the shaping roll 35 to manufacture the concavo-convex shaped composite elastic sheet 10C. Carry out the process. In the second step, when the convex portion 31a of the convex roll 31 is meshed with the concave portion 35b of the shaping roll 35 and the convex portion 35a of the shaping roll 35 is meshed with the concave portion 31b of the convex roll 31, the convex roll 31 The elastic member 13 supplied to the groove 31d is passed through the void formed by the convex portion 35a of the shaping roll 35 and the groove 31d of the convex roll 31 along the roll rotation direction.

In the second step, the elastic member 13 in the stretched state is passed through the void, and the joint 14 forms the top of the high tooth take part 31e and the bottom of the recess 35b of the shaping roll 35 that form the projection 31a of the projection roll 31. Under the state of being aligned so as to be positioned at, the joint portions 14 adjacent to each other in the roll rotation direction of the laminated sheet 10J are stretched. In the second step, the high tooth bush 31e of the convex roll 31 and the concave portion 35b of the shaping roll 35 are meshed with each other, and the concave portion 31b of the convex roll 31 and the convex portion 35a of the shaping roll 35 are meshed with each other. .. In the state where the teeth of the high-toothed tooth portion 31e and the convex portion 35a are meshed with each other, the degree of stretching of the laminated sheet 10J is large, and the main stretched portion of the laminated sheet 10J is the tip surface of the high-toothed tooth portion 31e and the convex portion 35a. It becomes the area between the tip surface. In the first sheet 11 and the second sheet 12 of the composite stretchable sheet 10C to be manufactured, the second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion. In addition, the tip surface of the high-toothed tooth portion 31e and the tip surface of the convex portion 35a are less likely to be stretched, and in the first sheet 11 and the second sheet 12 of the composite elastic sheet 10C, the fiber fixing portions are provided between the top portion and the bottom portion, respectively. The first region 16 having a short distance is formed.

In the second step, the teeth of the low toothbrush portion 31c of the convex roll 31 are located in the groove 31d, but the toothbrush of the low toothbrush portion 31c is the same as that of the high toothbrush portion 31e and the convex portion 35a. It is lower than the toothpaste. Therefore, the elastic member 13 is unlikely to be cut due to the stretching force. Although the low tooth depth portion 31c and the convex portion 35a are engaged with each other, even if these teeth are engaged with each other, the degree of stretching of the laminated sheet 10J is small. A second region 17 is formed between the top and bottom of the first and second sheets 11 and 12 of the composite stretchable sheet 10C to be manufactured, even in the portion where the elastic member 13 is arranged. In addition, the tip surface of the low tooth bush portion 31c and the tip surface of the convex portion 35a are difficult to be stretched, and in the first sheet 11 and the second sheet 12 of the composite elastic sheet 10C, even in the portion where the elastic member 13 is arranged, First regions 16 are formed on the top and bottom, respectively.

In the first sheet 11 and the second sheet 12, the second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion of the portion where the elastic member 13 is arranged, and the elastic member 13 is formed. The second region 17 is formed between the top and the bottom of the portion adjacent to the axial direction AD of the portion where is disposed, and the second region 17 is formed to extend in the roll axial direction AD. Similarly, in the first sheet 11 and the second sheet 12, the first regions 16 in which the distance between the fiber fixing portions is short are formed at the top and bottom of the portion where the elastic member 13 is arranged, and the elastic member is formed. The first region 16 is formed so as to extend in the roll axial direction AD by being formed at the top and the bottom of the portion adjacent to the portion where 13 is arranged in the axial direction AD. In this way, the intended composite elastic sheet 10C is manufactured.

The composite stretchable sheet 10C according to the third embodiment can also be manufactured using the manufacturing apparatus 40 shown in FIG. The manufacturing apparatus 40 includes a convex roll 41 and a shaping roll 45. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft.

The configuration of the convex roll 41 is substantially the same as the configuration of the convex roll 31 of the manufacturing apparatus 30. As shown in FIG. 14, the convex roll 41 is a concave-convex roll, and has a convex portion 41a and a concave portion 41b that linearly extend in the axial direction AD on the circumferential surface thereof. The convex portion 41a alternately has a high-toothed tooth portion 41e and a low-toothed tooth portion 45c along the axial direction AD. The length of the high tooth intake portion 41e along the axial direction AD is longer than the length of the low tooth engagement portion 45c along the axial direction AD. The length of the high tooth take-up portion 41e matches the length of the joint portion 14 in the manufactured composite stretch sheet 10C in the orthogonal direction Y. A groove 41d is formed on the convex roll 41 at a position corresponding to the low tooth catch portion 45c, and the groove 41d extends over the entire area in the circumferential direction of the roll. The pitch of the adjacent groove 41d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the manufactured composite stretch sheet 10C.

The structure of the shaping roll 45 is substantially the same as that of the convex roll 41. As shown in FIG. 14, the shaping roll 45 is a concave-convex roll, and has a groove 45d extending over the entire area in the circumferential direction of the roll, corresponding to the position of the groove 41d of the convex roll 41. The shaping roll 45 extends over the entire length of the convex roll 41 in the axial direction AD. The shaping roll 45 has a convex portion 45a and a concave portion 45b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 45a alternately has a high-toothed tooth portion 45e and a low-toothed tooth portion 45c along the axial direction AD. As shown in FIG. 14, the length of the high tooth catch portion 45e along the axial direction AD matches the length of the high tooth catch portion 41e of the convex roll 41 along the axial direction AD. The length of the low tooth bush portion 45c of the convex portion 45a along the axial direction AD is equal to the length of the low tooth tooth portion 41c of the convex roll 41 along the axial direction AD, and the width of the groove 45d is The width of the groove 41d of the convex roll 41 is the same. The tooth depth of the high toothed portion 45e of the shaping roll 45 is shorter than that of the high toothed portion 41e of the convex roll 41. Therefore, when the shaping roll 45 and the convex roll 41 are meshed with each other, the top of the high tooth take-up portion 41e of the convex roll 41 comes into contact with the bottom of the concave portion 45b of the shaping roll 45.

Using the manufacturing apparatus 40, as shown in FIG. 14, the strip-shaped sheet 11a of the first sheet 11 and the strip-shaped sheet 12a of the second sheet 12 are fed out from their original rolls (not shown). At the same time, a plurality of elastic members 13 aligned in one direction are arranged between the strip-shaped sheet 11a and the strip-shaped sheet 12a and supplied to the meshing portion of the convex roll 41 and the shaping roll 45. Each elastic member 13 is supplied to the position corresponding to the groove 41d of the convex roll 41 and the groove 45d of the shaping roll 45, and is extended along the rotation direction of the convex roll 41. The elastic member 13 supplied to the groove 41d and the groove 45d is formed along the roll rotation direction by the groove 41d and the groove 45d when the convex roll 41 and the shaping roll 45 are engaged with each other. It will be passed through the void.

Then, the joint portion 14 is formed on both sides in the roll axial direction of the elastic member 13 by the bottom portion of the concave portion 45b of the shaping roll 45 and the high-take tooth portions 41e, 41e located on both sides of the groove 41d of the convex roll 41. Then, the strip-shaped sheet 11a and the strip-shaped sheet 12a are joined. The joint portions 14 are arranged on both sides of each elastic member 13, and are regularly formed along the rotation direction of the convex roll 31 at regular intervals.

At the same time as forming the joint 14, the joints 14 adjacent to each other in the roll rotation direction are stretched. More specifically, the high toothed portion 41e of the convex roll 41 and the concave portion 45b of the shaping roll 45 mesh with each other, the concave portion 41b of the convex roll 41 and the convex portion 45a of the shaping roll 45 mesh with each other, and the first convex The first sheet 11 having the portion 1a and the first concave portion 1b and the second sheet 12 having the second convex portion 2a and the second concave portion 2b are manufactured. In the state where the teeth of the high-toothed tooth portion 41e and the high-toothed tooth portion 45e are meshed with each other, the degree of stretching of the belt-shaped sheets 11a and 12a is large, and the main stretching portion of the belt-shaped sheets 11a and 12a is the tip surface of the tooth-toothed tooth portion 41e. And the tip surface of the high-take tooth portion 45e. In the first sheet 11 and the second sheet 12 of the composite stretchable sheet 10C to be manufactured, the second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion. In addition, the tip surface of the high-toothed tooth portion 41e and the tip surface of the high-toothed tooth portion 45e are difficult to stretch, and in the first sheet 11 and the second sheet 12 of the composite elastic sheet 10C, the fiber fixing portion is provided at the top portion and the bottom portion, respectively. A first region 16 having a short distance therebetween is formed.

The teeth of the low-take tooth portion 41c of the convex roll 41 are located in the groove 41d, but the low-take tooth portion 41c has a high-teeth tooth portion 41e and a high-teeth tooth portion of the shaping roll 45. It is lower than the tooth depth of the portion 45e. Similarly, the teeth of the low-take tooth portion 45c of the shaping roll 45 are located in the groove 45d, but the low-take tooth portion 45c has a tooth depth larger than that of the high-teeth tooth portion 45e. It is low. Therefore, the elastic member 13 is unlikely to be cut due to the stretching force. Although the low-toothed tooth portion 41c of the convex roll 41 and the low-toothed tooth portion 45c of the shaping roller 45 are engaged with each other, the degree of stretching is small even if these teeth are engaged with each other. In the manufactured composite stretchable sheet 10C, the first sheet 11 and the second sheet 12 have the second region 17 formed between the top and the bottom even in the portion where the elastic member 13 is arranged. Further, the tip surfaces of the low-toothed teeth portions 41c and 45c are difficult to be stretched, and in the first sheet 11 and the second sheet 12 of the composite elastic sheet 10C, even in the portions where the elastic members 13 are arranged, the top portion and the bottom portion respectively. The first region 16 is formed. In this way, the target composite elastic sheet 10C in which the second region 17 and the first region 16 extend in the roll axis direction AD can be manufactured.

In the method for manufacturing the composite stretchable sheet 10C using the manufacturing apparatus 40, another auxiliary such as a flat roll that abuts the peripheral surface of the convex roll 41 is provided on the downstream side in the rotation direction than the meshing portion of the convex roll 41 and the shaping roll 45. A roll or the ultrasonic horn 45 shown in FIG. 3 of Japanese Unexamined Patent Application Publication No. 2018-099793 may be provided. By providing such an auxiliary roll or the like, the joint strength of the joint portion 14 in the composite stretchable sheet 10C can be adjusted.

In addition, when forming an opening penetrating the composite elastic sheet 10C at a position overlapping the joint portion 14 of the composite elastic sheet 10C or between the joint portions 14 adjacent to each other in the expansion/contraction direction X, projections are formed on the peripheral surface of the auxiliary roll. Should be placed. It is preferable that the protrusions are arranged corresponding to the positions of the convex portions 41a of the convex roll 41, or corresponding to the positions between the convex portions 41a adjacent in the rotation direction.

The composite elastic sheet 10C according to the third embodiment can also be manufactured using the manufacturing apparatus 50 shown in FIG. The manufacturing apparatus 50 includes a convex roll 51, first to third shaping rolls 52 to 54, and a joining roll 55. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft. The convex roll 51 and the first shaping roll 52 mesh with each other, and the second shaping roll 53 and the third shaping roll 54 mesh with each other. The convex roll 51 and the third shaping roll 54 mesh with each other on the downstream side in the rotational direction of the meshing portion of the convex roll 51 with the first shaping roll 52. The convex roll 51 and the joining roll 55 come into contact with each other on the downstream side in the rotational direction of the meshing portion of the convex roll 51 with the third shaping roll 54.

Incidentally, instead of the convex roll 51 and the first shaping roll 52, and the second shaping roll 53 and the third shaping roll 54, the first roll 5 and the first roll 5 described in FIG. 6 of JP 2008-289659 A and You may use the 2nd roll 6 and the 1st embossing roll 11 and the 2nd embossing roll 12 described in FIG. 6 of the international publication 2014/038578 pamphlet. Further, instead of the joining roll 55, the ultrasonic horn 45 shown in FIG. 3 of JP-A-2018-099793 may be used.

The configuration of the convex roll 51 is substantially the same as the configuration of the first convex roll 21 of the manufacturing apparatus 20. As shown in FIG. 15, the convex roll 51 is a concave-convex roll, and has a convex portion 51a and a concave portion 51b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 51a alternately has a high-toothed tooth portion 51e and a low-toothed tooth portion 51c along the axial direction AD. The length of the high tooth intake portion 51e along the axial direction AD is longer than the length of the low tooth engagement portion 51c along the axial direction AD. The length of the high-toothed tooth portion 51e is substantially the same as the length of the joint portion 14 in the manufactured stretchable composite sheet 10C in the orthogonal direction Y. The convex roll 51 has a groove 51d formed at a position corresponding to the low tooth catch portion 51c, and the groove 51d extends over the entire area in the circumferential direction of the roll. The pitch of the adjacent groove 51d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the manufactured composite stretchable sheet 10C.

The convex roll 51 has a suction hole (not shown) at the bottom of the concave portion 51b. The suction hole (not shown) communicates with a suction source (not shown) such as a blower or a vacuum pump. As shown in FIG. 15, from the meshing portion of the convex roll 21 and the third shaping roll 54 to the convex roll. The suction part 51f between the abutting portion of the roll 21 and the joining roll 55 is controlled so that suction is performed from the peripheral surface of the convex roll 51 toward the inside.

The configuration of the first shaping roll 52 is substantially the same as the configuration of the convex roll 51. As shown in FIG. 15, the first shaping roll 52 is a concavo-convex roll, and corresponds to the position of each adjacent linear groove 51d beyond one adjacent linear groove 51d in the axial direction AD of the convex roll 51. And has a groove 52d extending all over the circumferential direction of the roll. The first shaping roll 52 extends over the entire length of the convex roll 51 in the axial direction AD. The first shaping roll 52 has a convex portion 52a and a concave portion 52b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 52a has high toothed portions 52e and low toothed portions 52c alternately along the axial direction AD. The length of the high tooth intake portion 52e along the axial direction AD is longer than the length of the high tooth engagement portion 51e of the convex roll 51 along the axial direction AD. The length of the low tooth catch portion 52c of the convex portion 52a along the axial direction AD is equal to the length of the low tooth take portion 51c of the convex roll 51 along the axial direction AD, and the width of the groove 52d is The width of the groove 51d of the convex roll 51 is the same. The toothbrush of the high toothbrush portion 52e of the first shaping roll 52 is the same as the toothbush of the high toothbrush portion 51e of the convex roll 51. The concave portion 52b meshes with the convex portion 51a of the convex roll 51, and the convex portion 52a meshes with the concave portion 51b of the convex roll 51.

The configuration of the second shaping roll 53 is substantially the same as the configuration of the first shaping roll 52. As shown in FIG. 15, the second shaping roll 53 is a concavo-convex roll, and another line adjacent to the line groove 52d of the first shaping roll 52 of the convex roll 51 in the axial direction AD of the corresponding line groove 51d. Corresponding to the position of the groove 51d, there is a groove 53d extending over the entire area in the circumferential direction of the roll. The second shaping roll 53 has a convex portion 53a and a concave portion 53b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 53a alternately has a high-toothed tooth portion 53e and a low-toothed tooth portion 53c along the axial direction AD. The width of the groove 53d and the width of the groove 51d of the convex roll 51 are the same. The toothbrush of the high toothbrush portion 53e of the second shaping roll 53 is the same as the toothbush of the high toothbrush portion 51e of the convex roll 51.

The configuration of the third shaping roll 54 is substantially the same as the configuration of the convex roll 51. As shown in FIG. 15, the third shaping roll 54 is a concave-convex roll, but does not have a groove extending all over the circumferential direction of the roll. The third shaping roll 54 extends over the entire length of the convex roll 51 in the axial direction AD. The third shaping roll 54 has a convex portion 54a and a concave portion 54b. The tooth depth of the convex portion 54a is substantially the same as that of the high tooth tooth portion 51e of the convex roll 51. The concave portion 54b meshes with the convex portion 51a of the convex roll 51 and the convex portion 53a of the second shaping roll 53, and the convex portion 54a meshes with the concave portion 51b of the convex roll 51 and the concave portion 53b of the second shaping roll 53. There is.

As shown in FIG. 15, the joining roll 55 extends over the entire length of the convex roll 51 in the axial direction AD. The joining roll 55 has convex portions 55a extending along the rotation direction at regular intervals in the axial direction AD. The convex portion 55a is arranged at a position corresponding to the high tooth catch portion 51e of the convex roll 51. The length of the convex portion 55a along the axial direction AD is substantially the same as the length of the joint portion 14 in the manufactured composite elastic sheet 10C in the orthogonal direction Y. The top of the convex portion 55a of the joining roll 55 and the top of the convex portion 51a of the convex roll 51 are in contact with each other.

The manufacturing method of the composite stretchable sheet 10C using the manufacturing apparatus 50 is (1) the first step of manufacturing the unevenly shaped first sheet 11, and (2) the unevenness shaped in parallel with the first step. A second step of manufacturing the second sheet 12, and (3) a third step of transporting the laminated sheet 10J in which the first sheet 11 and the second sheet 12 are superposed on each other while holding the laminated sheet 10J on the roll peripheral surface, ) It is roughly classified into a fourth step of manufacturing the composite stretchable sheet 10C by joining the laminated sheet 10J.

In the first step, as shown in FIG. 15, the strip-shaped sheet 11 a of the first sheet 11 is fed out from its original roll (not shown), and the strip-shaped sheet 11 a is divided into a convex roll 51 and a first shaping roll 52. Supply in between. When supplying, it is preferable from the viewpoint of shapeability that the strip-shaped sheet 11a is supplied from the convex roll 51 side and supplied along the peripheral surface of the convex roll 51. At the same time, the plurality of first elastic members 13a aligned in one direction are supplied between the convex roll 51 and the first shaping roll 52. The first elastic member 13a is passed between the convex roll 51 and the first shaping roll 52 in a state where the first elastic member 13a is arranged on the side of the belt-shaped sheet 11a facing the first shaping roll 52.

In the first step, the high-toothed tooth portion 51e of the convex roll 51 and the recessed portion 52b of the first shaping roller 52 are engaged with each other, and the recessed portion 51b of the convex roller 51 and the high toothed tooth portion 52e of the first shaping roller 52 are combined. The first sheet 11 having the first convex portions 1a and the first concave portions 1b is meshed with each other to be manufactured. Since each of the high-toothed portions 51e and 52e has a high tooth depth, at the meshing portion between the convex roll 51 and the first shaping roll 52, the degree of stretching of the strip sheet 11a is large, and the main stretching portion of the strip sheet 11a is large. Is a region between the tip surface of the high-toothed tooth portion 51e and the tip surface of the high-toothed tooth portion 52e. In the first sheet 11, a second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion. In addition, the tip surface of the high-toothed tooth portion 51e and the tip surface of the high-toothed tooth portion 52e are difficult to stretch, and the first region 16 having a short distance between the fiber fixing portions is formed at each of the top portion and the bottom portion.

In the first step, as shown in FIG. 15A, each first elastic member 13a is located at a position corresponding to the groove 51d extending in the circumferential direction of the convex roll 51 and the groove 52d of the first shaping roll 52. It is supplied and extended along the rotation direction of the convex roll 51. The teeth of the low-toothed tooth portion 51c of the convex roll 51 are located in the groove 51d, but the tooth depth of the low-toothed tooth portion 51c is higher than that of the high-toothed tooth portion 51e and the first shaping roll 52. It is lower than the toothbrush of the toothbrush portion 52e. Similarly, the teeth of the low-take tooth portion 52c of the first shaping roll 52 are located in the groove 52d, but the low-take tooth portion 52c has a tooth gap of the high-teeth tooth portion 52e. Is lower than. Therefore, the first elastic member 13a is unlikely to be cut due to the stretching force. Although the low-toothed tooth portion 51c of the convex roll 51 and the low-toothed tooth portion 52c of the first shaping roll 52 are engaged with each other, the degree of stretching is small even if these teeth are engaged with each other. In the manufactured first sheet 11, the second region 17 is formed between the top portion and the bottom portion even in the portion where the first elastic member 13a is arranged. Further, the front end surface of the low tooth bush portion (not shown) is difficult to be stretched, and in the first sheet 11, even in the portion where the elastic member 13 is arranged, the first regions 16 are formed in the top portion and the bottom portion, respectively. Thus, the second region 17 and the first region 16 are formed so as to extend in the roll axis direction AD orthogonal to the extending direction of the first elastic member 13a.

In the first step, when the convex portion 51a of the convex roll 51 and the convex portion 52a of the first shaping roll 52 are butted against each other, the first elastic member 13a supplied to the groove 51d and the groove 45d is The groove 51d and the groove 52d pass through the space formed along the roll rotation direction. Then, as shown in FIG. 15, the first sheet 11 having the uneven shape is pressed against the circumferential surface of the convex roll 51 by the tension of each first elastic member 13 a extending in the rotation direction of the convex roll 51, Transfer to the third step of the process. By restraining the sheet 11 on the convex roll 51 by the elastic member 13a, the sheet 11 can be prevented from floating from the roll 51, and wrinkles or the like can be prevented from entering the sheet at the joint portion.

In the second step, as shown in FIG. 15, the strip-shaped sheet 12a of the second sheet 12 is fed out from its original roll (not shown), and the strip-shaped sheet 12a is fed to the second shaping roll 53 and the third shaping roll. Supply between 54 and. When supplying, it is preferable from the viewpoint of shapeability that the strip-shaped sheet 12a is supplied from the third shaping roll 54 side and is fed along the peripheral surface of the third shaping roll 54. At the same time, the plurality of second elastic members 13b aligned in one direction are supplied between the second shaping roll 53 and the third shaping roll 54. The second elastic member 13b is passed between the second shaping roll 53 and the third shaping roll 54 in a state of being arranged on the side of the strip-shaped sheet 12a facing the second shaping roll 53.

In the second step, as shown in FIG. 15, the high tooth take-up portion 53e of the second shaping roll 53 and the recess 54b of the third shaping roll 54 are engaged with each other, and the recess 53b of the second shaping roll 53 and the first The convex portion 54a of the three-shaped roll 54 is meshed with the second sheet 12 having the second convex portion 2a and the second concave portion 2b. Since the high toothbrush portion 53e and the convex portion 54a both have a high tooth depth, the degree of stretching of the belt-shaped sheet 12a is large at the meshing portion of the second shaping roll 53 and the third shaping roll 54, The main stretched portion of the sheet 12a is a region between the tip surface of the high toothbrush portion 53e and the tip surface of the convex portion 54a. In the second sheet 12, a second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion. Further, the tip end surface of the high-toothed tooth portion 53e and the tip end surface of the convex portion 54a are not easily stretched, and the first region 16 having a short distance between the fiber fixing portions is formed at the top portion and the bottom portion, respectively.

In the second step, as shown in FIG. 15, each second elastic member 13b is supplied to the position corresponding to the groove 53d extending in the circumferential direction of the second shaping roll 53, and the rotation of the third shaping roll 54. Stretched along the direction. The teeth of the low toothbrush portion 53c of the second shaping roll 53 are located in the groove 53d, but the toothbrush of the low toothbrush portion 53c is lower than the toothbush of the high toothbrush portion 53e. It is a thing. Therefore, the second elastic member 13b is unlikely to be cut due to the stretching force. Although the low tooth bush portion 53c of the second shaping roll 53 and the convex portion 54a of the third shaping roll 54 are engaged with each other, the degree of stretching is small even if these teeth are engaged with each other. In the manufactured second sheet 12, the second region 17 is formed between the top portion and the bottom portion even in the portion where the second elastic member 13b is arranged. Further, the distal end surface of the low tooth catch portion 53c is difficult to be stretched, and the first sheet 16 is formed in the top portion and the bottom portion of the second sheet 12 even in the portion where the elastic member 13 is arranged. In this way, the second region 17 and the first region 16 are formed so as to extend in the roll axis direction AD orthogonal to the extending direction of the second elastic member 13b.

In the second step, when the convex portion 53a of the second shaping roll 53 and the convex portion 54a of the third shaping roll 54 are abutted against each other, the second elastic member 13b supplied to the groove 53d becomes the second shaping member. The groove 53d of the shaping roll 53 and the convex portion 54a of the third shaping roll 54 are passed through a gap formed along the roll rotation direction. Then, as shown in FIG. 15, the second sheet 12 having the uneven shape is pressed against the peripheral surface of the third shaping roll 54 by the tension of each of the second elastic members 13 b extending in the rotation direction of the convex roll 51. While being attached, it is conveyed to the next step, the third step. By restraining the sheet 12 on the third shaping roll 54 by the elastic member 13b, it is possible to prevent the sheet 12 from floating from the third shaping roll 54, and to prevent wrinkles from entering the sheet at the joint portion. it can.

In the third step, as shown in FIG. 15, the unevenly shaped first sheet 11 and the unevenly shaped second sheet 12 are overlapped so that the phases of the unevenness in the respective sheets 11 and 12 coincide with each other. At the same time, the laminated sheet 10J is formed by stacking the elastic members 13a and 13b so that the arrangement surfaces thereof face each other. In the laminated sheet 10J, the position of the first convex portion 1a of the first sheet 11 is aligned with the position of the second concave portion 2b of the second sheet 12, and the second sheet is positioned at the position of the first concave portion 1b of the first sheet 11. The positions of the 12 second convex portions 2a are aligned.

In the third step, as shown in FIG. 15, since the position of the groove 52d of the first shaping roll 52 and the position of the groove 53d of the second shaping roll 53 do not match, supply to the groove 52d is performed. The formed first elastic member 13a and the second elastic member 13b supplied to the groove 53d do not overlap in the roll axial direction.

In the third step, the first elastic member 13a and the second elastic member 13b supplied to the groove 51d are provided with the groove 51d and the third elastic member 13b when the convex roll 51 and the third shaping roll 54 are meshed with each other. With the convex portion 54a of the shaping roll 54, the shaped roll 54 is passed through a void formed along the roll rotation direction.

The laminated sheet 10J has an uneven shape at the time when the first sheet 11 and the second sheet 12 are superposed, but in the third step, as shown in FIG. 15, the convex portion 51a of the convex roll 51 is formed. By engaging with the concave portion 54b of the third shaping roll 54, the concave and convex shapes are again formed into the same concave and convex shape. The reshaped laminated sheet 10J is sucked inward from the peripheral surface of the roll via the suction holes (not shown) in the suction portion 51f of the convex roll 51, and is retained on the peripheral surface of the convex roll 51. To be done. Then, the laminated sheet 10J is conveyed to the fourth step, which is the next step, in a state where the laminated sheet 10J is maintained in a shape along the uneven shape of the convex roll 51.

In the fourth step, the first elastic member 13a and the second elastic member 13b supplied to the groove 51d, when the convex portion 51a of the convex roll 51 and the convex portion 55a of the joining roll 55 are brought into contact with each other, The groove 51d and the projection 55a of the joining roll 55 are passed through a gap formed along the roll rotation direction.

In the fourth step, as shown in FIG. 15, the high-take tooth portions 51e and 51e located on both sides of the groove 51d of the convex roll 51, and the convex portions 55a of the joining roll 55 corresponding to the respective high-teeth tooth portions 51e. Thus, the joint portions 14 are formed on both sides of each elastic member 13a, 13b arranged on the laminated sheet 10J, and the first sheet 11 and the second sheet 12 are joined. In this way, the intended composite elastic sheet 10C is manufactured.

The composite elastic sheet 10C according to the third embodiment can also be manufactured using the manufacturing apparatus 60 shown in FIG. The manufacturing apparatus 60 includes a convex roll 61, a shaping roll 62, and a joining roll 63. These rolls are adapted to rotate in a direction indicated by an arrow by transmitting a driving force from a driving means (not shown) to the rotary shaft. The convex roll 61 and the shaping roll 62 mesh with each other. The convex roll 61 and the joining roll 63 come into contact with each other on the downstream side in the rotational direction of the meshing portion of the convex roll 61 with the shaping roll 62.

Incidentally, instead of the convex roll 61 and the shaping roll 62, the first roll 5 and the second roll 6 described in FIG. 6 of JP-A-2008-289659 and the diagram of International Publication No. 2014/038578 pamphlet. The first embossing roll 11 and the second embossing roll 12 described in 6 may be used.

The shaping roll 62 has a configuration that is substantially the same as the configuration of the first convex roll 21 of the manufacturing apparatus 20. As shown in FIG. 16, the shaping roll 62 is an uneven roll, and has a convex portion 62a and a concave portion 62b that linearly extend in the axial direction AD on the peripheral surface thereof. The convex portion 62a alternately has a high-toothed tooth portion 62e and a low-toothed tooth portion 61c along the axial direction AD. The length of the high tooth intake portion 62e in the axial direction AD is longer than the length of the low tooth engagement portion 61c in the axial direction AD. The length of the high toothed portion 62e is substantially the same as the length in the orthogonal direction Y of the joint portion 14 in the manufactured composite stretchable sheet 10C. The shaping roll 62 is provided with a groove 62d at a position corresponding to the low tooth depth portion 61c, and the groove 62d extends over the entire area in the circumferential direction of the roll. The pitch of the adjacent groove 62d in the axial direction AD is the same as the pitch of the adjacent elastic members 13 in the manufactured composite stretch sheet 10C.

As shown in FIG. 16, the convex roll 61 is a concave-convex roll, but does not have a groove extending all over the circumferential direction of the roll. The convex roll 61 extends over the entire length of the shaping roll 62 in the axial direction AD. The convex roll 61 has a convex portion 61a and a concave portion 61b. The tooth depth of the convex portion 61 a is substantially the same as the tooth depth of the high tooth depth portion 62 e of the shaping roll 62. The concave portion 61b meshes with the convex portion 62a of the shaping roller 62, and the convex portion 61a meshes with the concave portion 62b of the shaping roll 62.

The convex roll 61 has a suction hole (not shown) at the bottom of the concave portion 61b. The suction hole (not shown) communicates with a suction source (not shown) such as a blower or a vacuum pump. As shown in FIG. 16, from the meshing portion of the convex roll 61 and the shaping roll 62 to the convex roll 61, The suction part 61f up to the contact portion with the joining roll 63 is controlled so that suction is performed from the peripheral surface of the convex roll 61 toward the inside.

As shown in FIG. 16, the joining roll 63 extends over the entire length of the convex roll 61 in the axial direction AD. The bonding roll 63 has convex portions 63a extending along the rotation direction at regular intervals in the axial direction AD. The elastic member 13 passes through the space. The length of the convex portion 63a along the axial direction AD is substantially the same as the length of the joint portion 14 in the manufactured stretchable composite sheet 10C in the orthogonal direction Y. The top of the convex portion 63a of the joining roll 63 and the top of the convex portion 61a of the convex roll 61 are in contact with each other.

The manufacturing method of the composite elastic sheet 10C using the manufacturing apparatus 60 is (1) the first step of manufacturing the first sheet 11 and the second sheet 12 that are unevenly shaped, and (2) the first sheet 11 and the second sheet. It is roughly divided into a second step of manufacturing the composite stretchable sheet 10C by being joined with 12.

In the first step, as shown in FIG. 16, the strip-shaped sheet 11a of the first sheet 11 and the strip-shaped sheet 12a of the second sheet 12 are fed from their original rolls (not shown). At the same time, a plurality of elastic members 13 aligned in one direction are arranged between the strip-shaped sheet 11a and the strip-shaped sheet 12a and supplied to the meshing portion of the convex roll 61 and the shaping roll 62. Each elastic member 13 is supplied to a position corresponding to the groove 62d of the shaping roll 62, and is extended along the rotation direction of the convex roll 61. The elastic member 13 supplied to the groove 62d is formed along the roll rotation direction by the groove 62d and the convex portion 61a of the convex roll 61 when the convex roll 61 and the shaping roll 62 are meshed with each other. It will be passed through the void.

In the first step, as shown in FIG. 16, the convex portion 61a of the convex roll 61 and the concave portion 62b of the shaping roll 62 are engaged with each other, and the concave portion 62b of the convex roll 61 and the high tooth take-up portion 62e of the shaping roll 62 are combined. Are meshed with each other to manufacture the first sheet 11 having the first convex portion 1a and the first concave portion 1b, and the second sheet 12 having the second convex portion 2a and the second concave portion 2b. In the state where the teeth of the convex portion 61a and the toothed portion 62e are meshed with each other, the degree of stretching of the belt-shaped sheets 11a and 12a is large, and the main stretched portions of the belt-shaped sheets 11a and 12a are the tip surface of the convex portion 61a and the high teeth. It becomes a region between the tip surface of the bamboo portion 62e. In the manufactured first sheet 11 and second sheet 12, a second region 17 having a long distance between the fiber fixing portions is formed between the top portion and the bottom portion. Further, the tip end surface of the convex portion 61a and the tip end surface of the high-toothed tooth portion 62e are difficult to be stretched, and the first sheet 11 and the second sheet 12 have a short distance between the fiber fixing portions at the top and the bottom, respectively. Region 16 is formed.

As shown in FIG. 16, the teeth of the low toothbrush portion 62c of the shaping roll 62 are located in the groove 62d. The toothbrush of the low toothbrush portion 62c is the high toothbrush portion 62e and It is lower than the tooth depth of the convex portion 61a of the convex roll 61. Therefore, the elastic member 13 is unlikely to be cut due to the stretching force. The low tooth depth portion 62c of the shaping roll 62 and the convex portion 61a of the convex roll 61 come to mesh with each other, but even if these teeth mesh with each other, the degree of stretching is small. In the manufactured first sheet 11 and second sheet 12, the second region 17 is formed between the top portion and the bottom portion even in the portion where the elastic member 13 is arranged. In addition, the tip surface of the low toothbrush portion 62c is difficult to be stretched, and in the first sheet 11 and the second sheet 12, the first regions 16 are formed in the top portion and the bottom portion even in the portions where the elastic members 13 are arranged. It

As shown in FIG. 16, in the first step, the first sheet 11 and the second sheet 12 having the concave-convex shape are internally drawn from the peripheral surface of the roll via the suction holes (not shown) in the suction section 61f of the convex roll 61. And is held on the roll peripheral surface of the convex roll 61. The first sheet 11 and the second sheet 12 having the concave-convex shape are conveyed to the second step of the next step while being maintained in the shape along the concave-convex shape of the convex roll 61.

In the second step, the elastic member 13 is passed through the elastic member 13 through the void formed along the roll rotation direction by the convex roll 61 extending in the circumferential direction of the joining roll 63 and the convex portion 61a of the convex roll 61. The joint portions 14 are formed on both sides of the first sheet 11 and the second sheet 12 to be joined. In this way, the intended composite elastic sheet 10C is manufactured.

In the method for manufacturing the composite stretchable sheet 10C using the manufacturing apparatus 60, another auxiliary such as a flat roll that abuts the peripheral surface of the convex roll 61 is provided on the downstream side in the rotation direction than the abutting portion between the convex roll 61 and the joining roll 63. A roll or the ultrasonic horn 45 shown in FIG. 3 of Japanese Unexamined Patent Application Publication No. 2018-099793 may be provided. By providing such an auxiliary roll or the like, the joint strength of the joint portion 14 in the composite stretchable sheet 10C can be adjusted.

The composite stretchable sheets 10A, 10B, and 10C manufactured as described above are particularly suitable as a sheet that constitutes a side sheet that serves as a leak-proof cuff in an absorbent article, and a sheet that constitutes an exterior body that forms the outer surface of the absorbent article. Used for. When used as a sheet constituting a side sheet, the manufactured composite stretchable sheets 10A to 10C are then transported to, for example, a conventional so-called vertical flow type sanitary napkin manufacturing apparatus. And, an absorptive material provided with a liquid-permeable topsheet continuum, a liquid-impervious backsheet continuous body, and a plurality of liquid-retaining absorbers in the transport direction between the two sheet continuums. The composite elastic sheets 10A to 10C thus produced are arranged on the continuous body of the main body along both sides in the transport direction as a continuous body of the side sheet, and the continuous body is cut to manufacture a sanitary napkin. can do. When manufacturing a sanitary napkin, it is preferable that another member constituting the sanitary napkin is not joined to the second region 17 having a long distance between the fiber fixing portions of the composite elastic sheet.

In addition, for example, when it is used as a sheet constituting an outer body of a pants-type disposable diaper, the manufactured composite stretchable sheets 10A to 10C are then conveyed to a conventional so-called lateral flow type pants-type disposable diaper manufacturing apparatus. .. Two prepared composite elastic sheets 10A, 10B, 10C are prepared, and the two composite elastic sheets 10A to 10C are provided as a continuous body of a pair of exterior bodies at intervals in the direction orthogonal to the transport direction. .. Then, the absorbent main body including the liquid-retaining absorber manufactured in a separate step is intermittently supplied in the transport direction, and the absorbent main bodies are arranged so as to span the pair of composite elastic sheets 10A to 10C. And fix it with adhesive. After that, the absorbent main body is folded in two in a direction orthogonal to the transport direction, and the pair of composite elastic sheets 10A to 10C are overlapped to obtain a continuous diaper body. After that, the continuous diaper is joined between the absorbent main bodies adjacent to each other in the transport direction in the direction orthogonal to the transport direction and simultaneously cut to manufacture a pants-type disposable diaper. When manufacturing a disposable diaper such as a pants-type disposable diaper, it is preferable that another member constituting the diaper is not joined to the second region 17 having a long distance between the fiber fixing portions in the composite elastic sheet.

The method for manufacturing the composite elastic sheet used in the absorbent article of the present invention is not limited to the method for manufacturing the composite elastic sheets 10A to 10C according to the above-described first to third embodiments, and can be appropriately changed. is there. In addition, the respective constituents in the method for manufacturing the composite stretchable sheets 10A to 10C according to the above-described first to third embodiments can be appropriately combined and implemented within a range not impairing the gist of the present invention.

In the manufacturing method described above, the joint portion 14 between the first sheet 11 and the second sheet 12 is formed by pressure bonding or fusing the first sheet 11 and the second sheet 12, but instead of this, bonding It may be formed by the agent. Further, in addition to the joint 14 formed by pressure bonding or fusion, another joint formed by an adhesive may be formed.

When an adhesive is used, for example, in the manufacturing method using the manufacturing apparatus 20, the meshing portion of the first convex roll 21 and the first shaping roll 25, and the contact portion of the first convex roll 21 and the second convex roll 22 It is preferable to dispose an adhesive application section between the two and apply the adhesive to the first sheet 11 or the first elastic member 13a having the uneven shape at intervals in the MD direction. Similarly, an adhesive agent application part is arrange|positioned between the meshing part of the 2nd convex roll 22 and the 2nd shaping roll 26, and the contact part of the 1st convex roll 21 and the 2nd convex roll 22, and an adhesive agent is arrange|positioned. It is preferable to intermittently coat the second sheet 12 or the second elastic member 13b having the uneven shape with a space between them in the MD direction using a comb gun or the like. As a result, it is possible to prevent the first convex roll 21, the first shaping roll 25, the second convex roll 22, and the second shaping roll 26 from adhering dirt due to the adhesive. When the adhesive is directly applied to the first elastic member 13a and the second elastic member 13b, the elastic member can be prevented from coming off, and a minimum amount of adhesive is required, so that a soft composite stretchable sheet can be obtained. In addition, when the adhesive is applied to the first sheet 11 and the second sheet 12 that are unevenly shaped, it is possible to prevent the adhesive-coated portion of the manufactured composite stretch sheet from being cured. From the same point of view, when applying the adhesive to the first sheet 11 and the second sheet 12, at positions corresponding to the groove grooves 21d and 22d of the convex rolls 21 and 22 intermittently (stripe shape) in the axial direction AD. , MD direction is preferably applied intermittently.

When an adhesive is used to fix the elastic member 13 to both sheets 11 and 12, examples of the adhesive include styrene-based (SIS, SBS, SEBS) or polyolefin-based hot melt adhesives. In particular, a pressure-sensitive SIS-based hot melt adhesive is preferable from the viewpoint of slipping out or exudation of the elastic member.

Although the above-mentioned manufacturing method manufactures the composite elastic sheets 10A to 10C including the elastic member 13 continuously extending in the MD direction, the elastic member 13 is finely divided in a part of the composite elastic sheets 10A to 10C in the MD direction. May be. When the composite elastic sheet is used as the outer layer of the disposable pants diaper, it is preferable to divide the elastic member 13 on the absorbent body included in the diaper. When the elastic member 13 is finely divided, for example, in the manufacturing method using the manufacturing apparatus 20, a portion without the groove 21d is provided in the circumferential direction of the first convex roll 21, and the groove is formed in the circumferential direction of the second convex roll 22. A portion without 22d may be provided. It is preferable that the portion of the first convex roll 21 without the groove 21d and the portion of the second convex roll 22 without the groove 22d are formed at corresponding positions.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the invention is not limited to such embodiments. Unless otherwise specified, "%" means "mass %".

[Example 1]
A composite elastic sheet was manufactured using the manufacturing apparatus 20 shown in FIG. As the first sheet and the second sheet, the isotactic homopolypropylene (melting point 165° C.) shown in Table 1 is 84% by mass, the low stereoregular polypropylene (melting point 78° C.) is 15% by mass, and the fatty acid amide is 1% by mass. The spunbonded non-woven fabric containing the same was used, and the elastic rubber used was the rubber thread made of polyurethane shown in Table 1. The feeding/insertion ratio of the rubber thread to this device was 2.6 times (expanded to 2.6 times with the state of being wound on the original rubber thread as 1 time). The manufacturing conditions are as follows: the first sheet has a high draw ratio 21e with a draw ratio of 2.6 times, the high joining height of the high take part 21e has a draw ratio of 2.7 times, and the low take part has a low draw ratio. The draw ratio of 21c was adjusted to 2.2 times, the draw ratio of the high toothed portion 22e of the second sheet was adjusted to 2.6, and the draw ratio of the low toothed portion 22c was adjusted to 2.2. .. The pitch of the convex portions 21a and 22a and the concave portions 21b and 22b of the convex rolls 21 and 22 in the MD direction was 2 mm. The high toothed portion 22e was provided with every five high portions in the rotation direction, and the joint portions 14 were formed at a pitch of 10 mm (the length above the convex roll 21). The winding angle of the elastic member around the convex rolls 21 and 22 was 90 degrees. Convex parts of convex rolls 21 and 22: high-toothed tooth part 21e, low-toothed tooth part 21c, high-toothed tooth part 22e, low-toothed tooth part 22c, curvature radii R of tips of the convex portions 25a and 26a of the shaping rolls 25 and 26. Was 0.3 mm. The convex rolls 21 and 22 were heated to a surface temperature of 110° C. and weakly heat-sealed. Convex roll 25 Convex roll 26 was left as it was without heating. An auxiliary uneven roll having the same shape as that of the convex roll 22 was used downstream of the convex roll 21 to heat and pressurize at a surface temperature of 165° C., and additional heat seal joining was performed by abutting the convex portions. Further, a comb gun type adhesive application section is arranged between the meshing sections of the convex rolls 21 and 22 and the shaping rolls 25 and 26, and the contact portions of the first convex roll 21 and the second convex roll 22, respectively. The adhesive is applied to the elastic member with an unapplied portion having a length on the convex roll 21 of 100 mm in the MD direction, and an applying portion corresponding to the joining region 19 having a length of 30 mm in the MD direction is provided at intervals with application. The basis weight of the adhesive was 6 g/m ² . The composite stretchable sheet manufactured under such manufacturing conditions has a stretch-stopping elongation of 314%, a pitch of elastic members in the orthogonal direction Y of 5 mm, and a joint stretch-free stretch pitch in the stretchable direction X. P2 was 25.3 mm and the joint pitch in the orthogonal direction Y was 5 mm. The joint portion was arranged between the elastic members adjacent to each other in the orthogonal direction Y.

[Example 2]
A composite elastic sheet was manufactured in the same manner as in Example 1 except that the manufacturing conditions were changed to the values shown in Table 1. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Example 3]
By using the manufacturing apparatus 20 shown in FIG. 6, the meshing amount of the convex roll 21 and the shaping roll 25 is made larger than the meshing amount of the convex roll 22 and the shaping roll 26. It was set to the value shown in. A composite elastic sheet was produced in the same manner as in Example 1 except for the above conditions. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Example 4]
Using the manufacturing apparatus 20 shown in FIG. 6, the pitch of the convex portions 21a and 22a and the concave portions 21b and 22b of the convex rolls 21 and 22 in the MD direction was 7 mm. The draw ratio in the low toothbrush portions 21c and 22c was set to 1.0. In order to adjust the strength of expansion and contraction, the number of elastic members should be 10 per 50 mm width, and one elastic member was inserted in four places where two elastic members were inserted in one groove. The number of places is set to be two. The joining portions 14 were formed in the MD direction at a pitch of 7 mm (with the length above the convex roll 21). The manufacturing conditions were set to the values shown in Table 1. A composite elastic sheet was produced in the same manner as in Example 1 except for the above conditions. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Example 5]
A composite stretchable sheet was manufactured using the manufacturing apparatus 30 shown in FIG. As the manufacturing conditions, the stretching ratio in the high toothed portion 31e was adjusted to 2.3 times, and the stretching ratio in the low toothed portion 31c was adjusted to 2.2 times. The pitch of the convex portions 31a and the concave portions 31b of the convex roll 31 was 2 mm. The radius of curvature R of the tips of the convex portions 35a and 31c of the shaping roll 35 was 0.3 mm. The convex roll 31 and the flat joining roll 32 were heated to a surface temperature of 110° C. and 160° C., respectively. The surface temperature of the shaping roll 35 was 60°C. Further, the adhesive was not applied to the elastic members, but the elastic members were clamped and fixed by narrowing the interval between the joint portions arranged on both sides of each elastic member. A composite elastic sheet was manufactured in the same manner as in Example 1 except for these conditions. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Example 6]
The spacing between the joint portions arranged on both sides of each elastic member is widened so that the elastic members are not pinched, and a comb gun type adhesive application portion is provided in front of the abutting portions of the convex roll 31 and the flat joint roll 32. The adhesive is placed on the elastic member, the uncoated portion having a length of 100 mm in the MD direction is provided on the convex roll 31, and the coated portion having a length of 30 mm is provided in the MD direction at intervals to bond the coating portion. A composite stretchable sheet was produced in the same manner as in Example 5 except that the coating was performed so that the basis weight of the agent was 6 g/m ² . In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Example 7]
A composite elastic sheet was manufactured using the manufacturing apparatus 20A shown in FIG. A composite elastic sheet was manufactured in the same manner as in Example 1 except that the manufacturing conditions were changed to the values shown in Table 1. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Comparative Example 1]
The same first sheet, second sheet and elastic member as in Example 1 were used. Adhesive is applied to the entire surface of the first sheet (solid application), an elastic member is arranged between the adhesive-applied surface of the first sheet and the second sheet, and fixed to fix the composite stretch of Comparative Example 1. The sheet was manufactured. In the composite stretchable sheet produced under such production conditions, the pitch of the elastic members was the result shown in Table 1.

[Comparative Example 2]
A composite elastic sheet was manufactured using the manufacturing apparatus shown in FIG. 13 of JP-A-2008-142341. As the first sheet, the second sheet, and the elastic member, the same first sheet, second sheet, and elastic member as in Example 1 were used. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1.

[Comparative Example 3]
Instead of the 1st convex roll 21 with which the manufacturing apparatus 20 shown in FIG. 14 is provided, the uneven|corrugated roll which does not have the low toothbrush part 41c is used, and the composite stretchable sheet of the comparative example 1 is further stretch-processed, and a composite stretchable sheet is manufactured. did. As the manufacturing conditions, the draw ratio of the first shaping roll in the high tooth depth portion was adjusted to 2.2 times, and the draw ratio in the low tooth depth portion was adjusted to 2.0 times. In the composite stretchable sheet produced under such production conditions, the pitch of the elastic members was the result shown in Table 1.

[Comparative Example 4]
In addition to the manufacturing apparatus shown in FIG. 13 of Japanese Unexamined Patent Application Publication No. 2008-142341, a pair of concavo-convex rolls having no low tooth bushing portion as shown in FIG. The elastic sheet was further stretched to produce a composite elastic sheet. As the first sheet and the second sheet, those shown in Table 1 made of isotactic homopolypropylene were used. As the manufacturing conditions, the stretched plate ratio in the high tooth portion was adjusted to 2.2 times. In the composite stretchable sheet manufactured under such manufacturing conditions, the pitch of the elastic member and the pitch of the joint were the results shown in Table 1. At the processing speed of 50 m/min or more, breakage of the elastic member was observed.

[Evaluation]
With respect to the composite stretchable sheets of Examples 1 to 7 and the composite stretchable sheets of Comparative Examples 1 to 4, compression properties and stretchability properties were measured by the following methods, and sensory evaluation was performed according to the following criteria. In addition, the measurement location was the area without the adhesive for the sample to which the adhesive was intermittently applied.

<Measurement of compression characteristics>
As for the compression characteristics, a KES compression tester (KES FB-3 manufactured by Kato Tech Co., Ltd.) was used to evaluate the compression characteristics up to 50 g/cm ^{2 in} the normal mode, and the compression resilience RC value was read. The sample was grasped at both ends while being stretched 1.4 times from the relaxed state. The measurement location was the central part, which was not gripped. As the measured value, three points were measured and the average value was taken as the compression recovery property. This KES compression tester is a plate whose compression part has a circular flat surface with an area of 2 cm ² , the compression speed is 0.1 mm/s, the maximum compression pressure is 50 g/cm ² , and compression is performed when the maximum compression pressure is reached. It reverses the direction and shifts to the recovery process. The RC value represents the ratio (WC'/WC) of the energy WC' at the time of recovery to the energy WC at the time of compression (WC'/WC), and the larger the RC value, the better the recoverability against compression and the elasticity. It is said that. The energy WC at the time of compression is obtained as an integrated value of the displacement length of the pressure from the thickness T _{0 at which the} initial pressure of 0.5 g/cm ² is applied to the nonwoven fabric test piece to the thickness T _{m at} which the maximum pressure of 50 g/cm ² is applied. .. The recovered energy WC′ is obtained as an integral value of displacement length of pressure from the thickness T _m to the thickness T ₀ . WC corresponds to the hardness during compression. Further, a material having a high WC' has a high resilience.

<Measurement of stretchability>
The expansion/contraction cycle characteristics are measured in the same manner as the elongation at elongation, elongation at elongation at elongation is reached at a speed of 300 mm/min, and when 500 cN/50 mm is reached, the elongation between chucks is immediately reduced to 0% at 300 mm/minute. The load at the time of returning was measured. In the case of breaking before reaching 500 cN/50 mm, a value obtained by multiplying the elongation at the maximum strength point by 0.8 was measured as the elongation at elongation stop. When performing measurement based on the length of the relaxed composite elastic sheet, the sample was set between the chucks in the relaxed state. When the length of the original sheets 11 and 12 before processing is used as a reference, the original sheet is marked so that the length between chucks is the same as 100 mm before processing, and the composite stretchable sheet after processing is processed. Chuck between marks. Thereby, the elongation with respect to the length of the original sheet is obtained. Assuming an extension range at the time of use, the elongation at a returning load of 200 cN/50 mm and the elongation at a returning load of 40 cN/50 mm were measured. In addition, the elongation when the load was less than 2 cN/50 mm was measured as the residual strain. For the elastic member alone, the amount of the elastic member was set to be the same as that of the composite elastic sheet, and the measurement was performed.
[(200 cN/50 mm hour length when returning sample-40 cN/50 mm hour length when returning)/(200 cN/50 mm hour length when returning elastic member-40 cN/50 mm hour length when returning)] ×100 (%) was determined. The higher this value is, the wider the range of application in which the seats 11 and 12 are not obstructed in the application range of extension upon mounting.

<Sensory evaluation>
・Cushion sensory evaluation test (N=5)
Sensory evaluation of cushion feeling was performed using the composite stretchable sheet. Specifically, for the samples of Examples and Comparative Examples placed on the table in a state of being stretched 1.4 times from the relaxed state, five monitors (adults and men and women) hold the surface with their palms, an index finger, Sensory evaluation of the cushion feeling was performed by holding down with two fingertips of the middle finger. The following 5-grade evaluation criteria were used. Sensory evaluations were carried out by 5 monitors based on the evaluation criteria, and the scores were averaged and rounded off to obtain the evaluation results of Examples and Comparative Examples. 5 points: good cushion feeling, 4 points: rather good cushion feeling, 3 points: not good, 2 points: rather bad cushion feeling, 1 point: bad cushion feeling.
・Appearance sensory test (N=5)
The composite stretch sheet was used to perform a sensory evaluation of the appearance. Specifically, the samples of Examples and Comparative Examples placed on the table in a state of being stretched 1.4 times from the relaxed state were subjected to a sensory evaluation of the visual appearance by 5 monitors (adult men and women). It was The following 5-grade evaluation criteria were used. Sensory evaluations were carried out by 5 monitors based on the evaluation criteria, and the scores were averaged and rounded off to obtain the evaluation results of Examples and Comparative Examples. 5 points: good appearance, 4 points: rather good appearance, 3 points: not good, 2 points: rather bad appearance, 1 point: poor appearance.
・Sensory evaluation test of touch (N=5)
A composite stretch sheet was used to perform a sensory evaluation of touch. Specifically, with respect to the samples of Examples and Comparative Examples placed on the table in a state of being stretched 1.4 times from the relaxed state, five monitors (adults and men and women) pat the surface with a palm, an index finger, A sensory evaluation of touch was performed by stroking with two fingertips of the middle finger. The following 5-grade evaluation criteria were used. Sensory evaluations were carried out by 5 monitors based on the evaluation criteria, and the scores were averaged and rounded off to obtain the evaluation results of Examples and Comparative Examples. 5 points: good touch, 4 points: rather soft touch, 3 points: not good, 2 points: rather bad touch, 1 point: bad touch

As is clear from the results shown in Table 1, it is understood that the composite stretchable sheet of each example has higher stretchability and better sensory evaluation than the composite stretchable sheet of the comparative example.

10A, 10B, 10C Composite elastic sheet 11 1st sheet 1a 1st convex part 1b 1st recessed part 12 2nd sheet 2a 2nd convex part 2b 2nd recessed part 13 elastic member 14 joint part 16 The distance between fiber fixing parts is relative. The first region 17 is short and the second region 20 is relatively long in distance between the fiber fixing parts 20, 20A, 30, 40, 50, 60 Manufacturing equipment 21, 21A First convex roll 22, 22A Second convex roll 25, 52 1st shaping roll 26,53 2nd shaping roll 54 3rd shaping roll 31,41,51,61 convex roll 32,63 joining roll 35,45,62 shaping roll

Claims (15)

An absorbent article having a composite elastic sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
In the composite elastic sheet, the first fiber sheet and the second sheet are each formed in an uneven shape having a top portion and a bottom portion,
The first fibrous sheet has a first region in which the distance between the fiber fixing portions that fixes the intersections of the constituent fibers of the sheet is relatively short, and a second region in which the distance between the fiber fixing portions is relatively long. Have,
The first region is located at the top and the bottom, and the second region is located between the top and the bottom,
The first region extends in an orthogonal direction orthogonal to the stretching direction of the composite stretching sheet,
The first fiber sheet and the second sheet are joined at a joint portion formed at a position where the bottom portions of both sheets overlap each other,
A plurality of the joint portions are arranged on both sides of the elastic member in the orthogonal direction at intervals along the expansion and contraction direction,
The elastic member is arranged between the first fibrous sheet and the second sheet and fixed at both ends in the expansion/contraction direction of the elastic member, or fixed by being sandwiched between the joint portions. An absorbent article, which is fixed to at least one of the sides. The absorbent article according to claim 1, wherein the second region extends in the orthogonal direction. The composite stretchable sheet has one surface and the other surface each having an uneven shape, and the first surface forming the one surface forms the other surface at the position of the convex portion. The convex portion of the two sheets is located, the concave portion of the second sheet is located at the position of the concave portion of the first fiber sheet, and the joint portion is formed at a position where the concave portions of both sheets overlap each other. The absorbent article according to claim 1 or 2, which is present. At least one of the first fibrous sheet and the second sheet has a pitch P2 between the adjacent joint portions with respect to a value P1 obtained by doubling a repeating pitch interval between the first region and the second region in the stretching direction. The absorbent article according to any one of claims 1 to 3, wherein a value of P2/P1 which is a ratio of 2 is 2 or more. The length along the first fiber sheet from the one joint formed on the first fiber sheet to another joint adjacent to the joint in the expansion and contraction direction, and one formed on the second sheet. The absorbent article according to any one of claims 1 to 4, wherein a length along the second sheet from the joint portion to another joint portion adjacent to the joint portion in the expansion and contraction direction is different. The absorbent article according to any one of claims 1 to 5, wherein the first fibrous sheet has a maximum elongation of 50% or more in the original direction of the original sheet. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
A first elastic member extending along the roll rotation direction between a first convex roll having a convex portion on the circumferential surface and a first shaping roll having a concave portion that meshes with the convex portion of the first convex roll; The first fiber sheet is passed through in a state where the first elastic member is disposed on the side of the first fiber sheet facing the first shaping roll, and the first fiber sheet is at least in the roll rotation direction. A first step of shaping the first fibrous sheet into a concavo-convex shape by stretching along the
In parallel with the first step, between the second convex roll having a convex portion on the peripheral surface and the second shaping roll having a concave portion that meshes with the convex portion of the second convex roll, along the roll rotation direction. The extended second elastic member and the second sheet in a state where the second elastic member is disposed on the side of the second sheet facing the second shaping roll, and the second elastic member is passed through the second sheet. A second step in which the sheet is stretched at least along the roll rotation direction, and the second sheet is unevenly shaped;
The first fibrous sheet and the second sheet, each of which has been unevenly shaped, are overlapped so that the arrangement surfaces of the elastic members face each other, and the first fibrous sheet and the second sheet that are superposed are A third step of joining the first convex roll and the second convex roll by abutting the convex portions of each other,
In the first step and the second step, the fibrous sheet unevenly shaped by stretching is conveyed while being pressed against the peripheral surfaces of the first convex roll and the second convex roll by the tension of the elastic member,
In the third step, the first elastic member and the first elastic member in a stretched state are formed in a gap formed along the roll rotation direction by abutting the convex portions of the first convex roll and the second convex roll. The first fibrous sheet and the second sheet, which are superposed, are joined to each other through two elastic members on both sides of the first elastic member or the second elastic member in the orthogonal direction orthogonal to the expansion/contraction direction of the elastic member, A method for manufacturing a composite elastic sheet. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
Between the convex roll having a convex portion on the peripheral surface and the joining roll that abuts on the top of the convex portion of the convex roll, the first fiber sheet, the second sheet, and the sheet are arranged between the sheets. The first fibrous sheet and the second sheet are joined to each other on both sides of the elastic member in the orthogonal direction orthogonal to the expansion and contraction direction of the elastic member through the elastic member extended along the roll rotation direction. And a first step of forming a laminated sheet with a joint portion formed,
The laminated sheet is introduced into a meshing portion of a shaping roll that is arranged on the downstream side in the rotational direction of the convex roll than the convex roll and the joining roll, and that has a concave portion that meshes with the convex portion, and unevenly shape Has two steps,
In the second step, while the elastic member in an extended state is passed through the void portion formed along the roll rotation direction by the engagement of the convex roll and the shaping roll, the joint portion is the convex roll. Under the state of being aligned so as to be located at the top of the convex portion and the bottom of the concave portion of the shaping roll, stretching between the joint portions adjacent to each other in the roll rotation direction of the laminated sheet, of the composite stretch sheet Production method. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
The first fiber sheet, the second sheet, and the mesh between the convex roll having a convex portion on the peripheral surface and the shaping roll having a concave portion that meshes with the convex portion are arranged between the sheets, and By introducing the elastic member extended along the roll rotation direction, the first fibrous sheet and the second sheet are provided on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member. At the same time as joining to form a joining portion, unevenness is formed by stretching between the joining portions adjacent to each other in the roll rotation direction,
A method for manufacturing a composite stretchable sheet, wherein, in the uneven shaping, the elastic member in the stretched state is passed through a gap formed along the roll rotation direction by meshing of the convex roll and the shaping roll. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
At least the first fiber sheet is passed through the first fiber sheet between a first convex roll having a convex portion on the circumferential surface and a first shaping roll having a concave portion that meshes with the convex portion of the first convex roll. The first fibrous sheet is stretched along the roll rotation direction to shape the first fibrous sheet, and the first fibrous sheet having the roughened shape is drawn inward from the circumferential surface of the first convex roll on the circumferential surface of the roll. The first step of carrying while holding
In parallel with the first step, the second sheet is passed between a second convex roll having a convex portion on its peripheral surface and a second shaping roll having a concave portion that meshes with the convex portion of the second convex roll. , Drawing the second sheet at least along the roll rotation direction to shape the second sheet unevenly, and sucking the unevenly shaped second sheet inward from the peripheral surface of the second convex roll. The second step of carrying while holding on the roll peripheral surface by
The first fibrous sheet and the second sheet each having an uneven shape, and the elastic members arranged between the non-opposing surfaces of the convex rolls of the sheets and extending along the roll rotation direction. A third step of joining a laminated sheet in which the above are overlapped by abutting the convex portions of the first convex roll and the second convex roll,
In the third step, the composite stretchable sheet in which the elastic member in the stretched state is passed through a gap formed along the roll rotation direction by the abutting of the convex portions of the first convex roll and the second convex roll. Manufacturing method. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
A first elastic member stretched along a roll rotation direction and a first fiber between a convex roll having a convex portion on its peripheral surface and a first shaping roll having a concave portion that meshes with the convex portion of the convex roll. A sheet in a state in which the first elastic member is disposed on the side of the first fiber sheet facing the first shaping roll, and the first fiber sheet is stretched at least along the roll rotation direction. A first step of shaping the first fiber sheet into a concavo-convex shape,
In parallel with the first step, between a second shaping roll having a convex portion and a concave portion meshing with each other on the peripheral surface and a third shaping roll, a second elastic member extended along the roll rotation direction. The second sheet is passed through in a state where the second elastic member is arranged on the side of the second sheet facing the second shaping roll, and the second sheet is passed at least along the roll rotation direction. A second step of stretching the second sheet to form an uneven shape,
The first fibrous sheet and the second sheet, each of which has an uneven shape, are superposed such that the phases of the unevenness of the sheets are the same and the arrangement surfaces of the elastic members are opposite to each other, and are formed thereby. The laminated sheet is shaped into concave and convex again by engaging the convex portion of the convex roll with the concave portion of the third shaping roll, and the concave and convex shaped laminated sheet is internally formed from the peripheral surface of the convex roll. A third step of conveying while holding on the roll peripheral surface by suction toward
The unevenly shaped laminated sheet is passed between the convex roll and the joining roll which is arranged on the downstream side in the rotation direction of the convex roll with respect to the third shaping roll and which abuts on the top of the convex portion. A fourth step of joining the first fiber sheet and the second sheet on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member,
In the first step, the first fiber sheet is stretched by the engagement of the convex roll and the first shaping roll, and the first fiber sheet unevenly shaped by stretching is stretched by the tension of the first elastic member. While conveying it while pressing it on the peripheral surface of the convex roll,
In the second step, the second sheet is stretched by the meshing of the shaping rolls, and the second sheet unevenly shaped by stretching is stretched by the tension of the second elastic member to the third shaping roll. It is transported while pressing on the peripheral surface of
In the third step, the first elastic member and the second elastic member that are in an expanded state in a gap formed along the roll rotation direction by abutting the convex portions of the convex roll and the third shaping roll with each other. Through the elastic member, the first fiber sheet and the second sheet are superposed,
In the fourth step, at least the first elastic member and the second elastic member in a stretched state are passed through a gap formed along the roll rotation direction by contact between the convex roll and the joining roll. A method for manufacturing an elastic sheet. A method for manufacturing a concavo-convex composite stretchable sheet in which an elastic member extending in one direction is sandwiched between a first fiber sheet and a second sheet made of a fiber sheet or a resin film,
The first fiber sheet, the second sheet, and the mesh between the convex roll having a convex portion on the peripheral surface and the shaping roll having a concave portion that meshes with the convex portion are arranged between the sheets, and Introducing the elastic member stretched along the roll rotation direction to stretch each fibrous sheet, and both the unevenly shaped sheets are sucked inward from the peripheral surface of the convex roll to the roll of the convex roll. A first step of conveying while holding on the peripheral surface,
Between the convex roll and the shaping roll, between the joining roll arranged on the downstream side in the rotational direction of the convex roll and contacting the top of the convex portion, both the unevenly shaped sheets are passed, 1) a second step of joining the fiber sheet and the second sheet on both sides of the elastic member in an orthogonal direction orthogonal to the expansion and contraction direction of the elastic member,
In the second step, a method for manufacturing a composite stretchable sheet, in which the elastic member in the stretched state is passed through a gap formed along the roll rotation direction by the contact between the convex roll and the joining roll. In the uneven shaping, the second region in which the distance between the fiber fixing portions that fix the intersections of the constituent fibers of the first fiber sheet is relatively long is continuous in the orthogonal direction orthogonal to the elastic direction of the elastic member. 13. The method for manufacturing a composite stretch sheet according to claim 7, wherein the stretchable composite sheet is formed so as to extend. The method for manufacturing a composite stretchable sheet according to claim 7, wherein the void portion is a groove extending over the entire circumference in the rotation direction of the convex roll. 10. The joint part on both sides of the elastic member is formed adjacent to the elastic member in a direction orthogonal to the direction of expansion and contraction of the elastic member, and a plurality of the joints are formed along the direction of expansion and contraction. A method for producing the composite elastic sheet described.

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