JP6492152B1 - Telescopic member and disposable wearing article having the telescopic member - Google Patents

Abstract

An object of the present invention is to improve the appearance of an elastic member including an elastic sheet. A first sheet layer 20A and a second sheet layer 20B are formed of a light transmitting material, and an elastic sheet 30 is visible through the first sheet layer 20A and the second sheet layer 20B. In the unfolded state, as the non-bonding bands 51 and 52 in which the portion without the sheet bonding portion 40 is continuous in the unfolded state 80, the first linearly continuous in the first direction 51d intersecting the acute angle with the expansion and contraction direction ED. The non-bonding bands 51 are repeatedly present at intervals in the direction orthogonal to the first direction 51 d, and the sheet bonding portion 40 and the bonding hole 31 are spaced between the adjacent first non-bonding bands 51 in the stretchable region 80. Unit structures including a plurality of first non-bonding bands 51 having different first widths 51w determined as widths in the direction orthogonal to the first direction 51d are provided in multiples in a first direction 51d of the stretchable area 80. There repeatedly in the direction perpendicular a telescopic member. [Selected figure] Figure 9

Description

  The present invention relates to a stretchable member having a stretchable structure in which an elastic sheet such as an elastic film is sandwiched between a first sheet layer and a second sheet layer, and a disposable wearing article having the stretchable member.

  In disposable wearing articles such as disposable diapers, in order to improve the fit to the body surface, it is common to impart stretchability to appropriate places such as around the legs and around the waist. Conventionally, as a method for imparting stretchability, a method of attaching an elongated elastic member such as thread rubber in a state of being stretched in the longitudinal direction is widely adopted, but in the case of wanting to impart stretchability with a certain width In the above, a mode is adopted in which thread rubbers are fixed in a state of being arranged side by side at intervals in the width. Moreover, as a thing excellent in the fit property as a surface, the method of attaching in the state which expand | extended the elastic sheet in the provision direction of stretchability is also proposed. (See, for example, Patent Document 1 and Patent Document 2).

  The elastic member is laminated between the first sheet layer and the second sheet layer, and the elastic member including the elastic sheet is in a state in which the elastic film is expanded in the elastic direction, the first sheet layer and the second sheet The layers are formed by bonding through a bonding hole formed in an elastic film at a plurality of point-like sheet bonding portions arranged with intervals in the stretching direction and the direction orthogonal thereto, respectively. Then, in the natural length state, in the natural length state, as the elastic sheet shrinks between the sheet bonding portions, the distance between the sheet bonding portions narrows, and the sheet bonding portion in the first sheet layer and the second sheet layer A weir is formed extending in a direction intersecting the expansion and contraction direction. On the other hand, at the time of elongation, as the elastic sheet elongates between the sheet joints, the space between the sheet joints and the wrinkles in the first sheet layer and the second sheet layer spread, and the completeness of the first sheet layer and the second sheet layer Elastic extension is possible to the deployed state. The elastic region by this elastic sheet is not only excellent in planar fit, but there is no bonding between the first sheet layer and the second sheet layer and the elastic sheet, and also the bonding of the first sheet layer and the second sheet layer There is an advantage that it is very flexible because it is extremely small, and that the bonding holes of the elastic sheet also contribute to the improvement of air permeability.

  On the other hand, since disposable wearing articles are used together with or as a substitute for underwear, the elastic members used for disposable wearing articles have not only functional requirements such as breathability, fit, flexibility, but also cloths. A close look is also sought.

  However, since the stretchable member including the conventional elastic sheet is basically arranged in a non-directional pattern such as a zigzag, since the sheet bonding portion and the bonding holes of the elastic film are arranged, even if wrinkles are formed. It was basically recognized as a plain appearance, and was poor in aesthetic appearance.

JP, 2016-189932, A JP, 2015-204982, A

  Then, the main subject of this invention is improving the aesthetics of the expansion-contraction member containing an elastic sheet.

The telescopic member which solved the said subject, and the disposable wearing article which has this telescopic member are as follows.
<First aspect>
An elastic sheet is interposed between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are connected through the elastic sheet at a plurality of sheet bonding portions arranged at intervals. Having an elastic sheet stretchable structure joined through a hole or via the elastic sheet,
The first sheet layer and the second sheet layer are formed of a translucent material, and the elastic sheet is visible through the first sheet layer and the second sheet layer.
The area having the elastic sheet expansion / contraction structure has an expansion / contraction area which is contracted in the expansion / contraction direction by the contraction of the elastic sheet and is extensible in the expansion / contraction direction,
In the expansion / contraction area, in the unfolded state, as a non-bonding zone in which a portion having no sheet bonding portion is continuous, a first non-bonding continuously continuing linearly along a first direction intersecting an acute angle with the expansion / contraction direction Bands are repeatedly present at intervals in a direction orthogonal to the first direction,
A large number of the sheet bonding portions and the bonding holes are provided at intervals between the adjacent first non-bonding bands in the stretchable region,
A unit structure including a plurality of first non-bonding bands having different first widths determined as widths in a direction orthogonal to the first direction is repeatedly present in a direction orthogonal to the first direction in the stretchable region.
Expandable member characterized in that.

(Action effect)
In the case of the stretchable member including an elastic sheet, the present inventor has the first sheet layer and the second sheet layer have translucency and elasticity, as in the case of using a non-woven fabric for the first sheet layer and the second sheet layer. When the sheet is visible through the first sheet layer and the second sheet layer, the transparency of the portion having the elastic sheet is lowered, so that the line pattern is effectively formed by devising the arrangement of the sheet bonding portion and the bonding hole. We found that we could add That is, as in the present aspect, when a unit structure including a plurality of first non-junction bands having different first widths is repeatedly present in a direction orthogonal to the first direction in the stretchable region, Similar change in width is formed in the continuous portion of the elastic sheet. That is, if the width of the first non-bonding zone is narrow, the width of the continuous portion of the elastic sheet inside is also narrow, and if the width of the first non-bonding zone is wide, the width of the continuous portion of the internal elastic sheet is also wide . Then, when there is a change in width in a direction perpendicular to the first direction in the continuous portion of the elastic sheet in the first non-bonding zone, the continuous portion and narrow width of the elastic sheet in the wide first non-bonding zone are obtained. As a result of visually emphasizing both continuous parts of the elastic sheet in the first non-bonding zone, the beautiful appearance of the diagonal stripe pattern even if the stretchable area is in the natural length state or in the wearing state where it is stretched to some extent Will be Further, in a state of contraction to a certain extent, for example, in a natural length state (product state), the size of the contraction ridge in the first non-bonding zone changes according to the first width of the first non-bonding zone. The oblique stripes appear more clearly under the influence of

<Second aspect>
The expandable member according to the first aspect, wherein the maximum value of the first width in the first non-bonding zone is the maximum value of the width in a direction orthogonal to the continuous direction in all the non-bonding zones.

(Action effect)
Even if an oblique stripe pattern along the first direction appears due to the contraction ridge of the first non-bonding zone and the continuous part of the elastic sheet therein, the oblique stripe pattern along the other oblique direction is stronger in the same stretchable area If it is visually recognized, there is a possibility that the oblique stripe pattern due to the contraction ridge of the first non-bonding zone and the continuous part of the elastic sheet inside thereof becomes inconspicuous. On the other hand, when it is constituted like this mode, in the expansion-contraction area, the diagonal stripe pattern by the contraction part of the 1st non-bonding zone and the continuation part of the elastic sheet inside that is visually recognized more strongly It is preferable because

<Third aspect>
In the unit structure, the maximum value of the first width in the first no-bonding zone is larger than the maximum value of the first interval in the direction orthogonal to the first direction in the adjacent first no-bonding zone. The small telescopic member according to the first or second aspect.

(Action effect)
As described above, by forming the wide interval portion in the unit structure, it is preferable because the diagonal stripes due to the contraction ridge of the first non-bonding zone and the continuous portion of the elastic sheet inside thereof become more strongly visible.

<Fourth aspect>
In the stretchable area,
As the non-bonding zone, a second non-bonding zone linearly continuous along a second direction other than the first direction and intersecting at an acute angle with the expansion / contraction direction is an interval in a direction orthogonal to the second direction Or the second widths which are determined as the widths in the direction orthogonal to the second direction in these second no-bonding zones are all the same, or
Does not have the second non-bonding zone,
The telescopic member according to any one of the first to third aspects.

(Action effect)
Even if an oblique stripe pattern along the first direction appears due to the contraction ridge of the first non-bonding zone and the continuous part of the elastic sheet therein, the oblique stripe pattern along the other oblique direction is stronger in the same stretchable area If it is visually recognized, there is a possibility that the oblique stripe pattern due to the contraction ridge of the first non-bonding zone and the continuous part of the elastic sheet inside thereof becomes inconspicuous. On the other hand, when it is constituted like this mode, in the expansion-contraction area, the diagonal stripe pattern by the contraction part of the 1st non-bonding zone and the continuation part of the elastic sheet inside that is visually recognized more strongly It is preferable because

<Fifth aspect>
In the stretchable region, the non-bonding zone is formed in a diagonal grid shape,
The first bonding-free zone is a portion which is continuous in one direction in the diagonal grid-like bonding-free zone,
The second bonding-free zone is a portion continuous in the other direction in the diagonal grid-like bonding-free zone,
In the first direction and the second direction, positive and negative inclinations with respect to the expansion and contraction direction are opposite to each other,
In the unfolded state of the stretchable region, acute angle side crossing angles with respect to the stretch direction in the first direction and the second direction are each 5 to 45 degrees.
The telescopic member of the 4th aspect.

(Action effect)
Even in the case of having a diagonal grid-like non-bonding zone as in this embodiment, by combining with the fourth embodiment, a diagonal stripe pattern by the contraction ridge of the first non-bonding zone and the continuous part of the elastic sheet inside thereof Become more visible. In addition, when the acute angle side crossing angle with respect to the expansion and contraction direction in the first direction and the second direction is 5 to 45 degrees, the elasticity in the expansion and contraction region can be sufficiently ensured.

<Sixth aspect>
All the sheet bonding portions in the stretchable region have a slender shape having an acute angle side crossing angle of 10 degrees or less in the longitudinal direction with respect to the direction orthogonal to the stretch direction and a maximum dimension of 0.1 to 0.4 mm in the stretchable direction. ing,
The telescopic member of the fifth aspect.

(Action effect)
When forming the first non-bonding zone, the sheet bonding portion is aligned in the first direction between adjacent first non-bonding zones, but in this case, all sheet bonding portions as in this embodiment By making the shape elongated in the direction orthogonal to the expansion and contraction direction, the dimension in the expansion and contraction direction of the first non-bonding zone can be secured larger, and a reduction in elasticity can be suppressed.

<Seventh aspect>
The unit structure is adjacent to the wide first non-bonding zone where the first width is maximum and the narrow first non-bonding zone narrower than the first width in the direction orthogonal to the first direction. Including multiple bottles,
Between the adjacent wide first non-bonding zones, a narrow strip having an acute angle side crossing angle of 5 degrees or less in the longitudinal direction with respect to the second direction and a dimension of 0.1 to 0.4 mm in the direction orthogonal to the longitudinal direction Sheet junctions are spaced apart and aligned in the first direction;
Between the adjacent narrow first non-bonding zones, the acute angle side crossing angle in the longitudinal direction with respect to the first direction is 45 degrees or more, and the dimension in the direction orthogonal to the longitudinal direction is 0.1 to 0.4 mm The elongated sheet joints are spaced apart in the first direction,
The telescopic member of the fifth aspect.

(Action effect)
With such a shape and arrangement of the sheet bonding portion, the contraction ridge of the first non-bonding band and the continuous portion of the elastic sheet therein are particularly visually emphasized with a smaller area of the sheet bonding portion. preferable.

Eighth Aspect
An integral exterior body extending from the front to the back, or an exterior provided separately for the front and the back, and an interior extending to the front and back of the crotch attached to the widthwise middle of the exterior. A disposable pants-type wearable article comprising a side seal portion in which both sides of an exterior body in a front body and both sides of an exterior body in a back body are joined, and a waist opening and a pair of left and right legs. ,
The elastic sheet according to any one of the first to seventh aspects, in at least one of the front body and the back body, covering at least a width direction range between the side seal portions in at least a partial range in the front-rear direction A telescopic member having a telescopic structure such that the telescopic direction of the telescopic region is in the width direction,
Disposable wear article characterized in that.

(Action effect)
The above-mentioned elastic member is suitable for the exterior body of the pants-type disposable wearing article as in this embodiment.

  According to the present invention, the advantages such as the improvement of the aesthetics of the elastic member including the elastic sheet are provided.

It is a top view (inner surface side) of the underpants type disposable diaper of an unfolded state. It is a top view (outer surface side) of the underpants type disposable diaper of an unfolded state. It is a top view which shows only the principal part of the underpants type disposable diaper of an unfolded state. (A) is CC sectional drawing of FIG. 1, (b) is EE sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view (outer surface side) of the underpants type disposable diaper of an unfolded state. (A) is CC sectional drawing of FIG. 7, (b) is EE sectional drawing of FIG. (A) is a principal part top view of an elastic region, (b) is a DD sectional view of (a), (c) is a sectional view in a mounted state, (d) is a sectional view in a natural length state. It is a top view which shows the various shapes of a sheet | seat junction part. It is a top view of the expansion-contraction area | region of an unfolded state. It is a top view which expands and shows the principal part of the expansion-contraction area | region of an expansion | deployment state. It is a top view which expands and shows the principal part of the expansion-contraction area | region of a natural length state. (A) is DD sectional drawing of FIG. 12, (b) is sectional drawing in a natural length state. It is a top view of the expansion-contraction area | region of an unfolded state. It is a top view which expands and shows the principal part of the expansion-contraction area | region of an expansion | deployment state. It is a top view which expands and shows the principal part of the expansion-contraction area | region of a natural length state. It is sectional drawing which shows roughly the principal part cross section of the exterior body expanded to a certain extent. It is sectional drawing which shows roughly the principal part cross section of the exterior body expanded to a certain extent. (A) Trace figure of a top photograph of a sheet joined part formed in the 1st welding form, (b) It is a trace figure of a top photograph of a sheet joined part formed in the 3rd welding form. It is the schematic of an ultrasonic sealing apparatus.

  Hereinafter, based on the example of the underpants type disposable diaper shown by the attached drawing, a telescopic member and a disposable wearing article are explained in full detail. In addition, the dotted part in sectional drawing has shown joining means, such as a hot-melt-adhesive agent.

  1 to 6 show a pants-type disposable diaper. The code | symbol LD (vertical direction) has shown the front-back direction, and WD has shown the width direction. This pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an exterior body 20 forming a front body F and a back body B, and an interior body 10 fixed and integrated to the inner surface of the exterior body 20. The inner body 10 is formed by interposing an absorber 13 between the liquid-permeable top sheet 11 and the liquid-impermeable sheet 12. In manufacturing, after the back surface of the inner body 10 is joined to the inner surface (upper surface) of the outer body 20 by bonding means such as a hot melt adhesive, the inner body 10 and the outer body 20 are front body F and back body B Are folded at the center in the front-rear direction LD (longitudinal direction), which is the boundary between the two, and both sides thereof are joined to each other by heat welding or a hot melt adhesive, etc. It becomes a pants type disposable diaper in which a pair of leg openings were formed.

(Example of the structure of the interior body)
The inner body 10 has a structure in which an absorber 13 is interposed between a top sheet 11 and a liquid impermeable sheet 12 made of polyethylene or the like, as shown in FIGS. It absorbs and holds the excretory fluid that has passed through the sheet 11. The planar shape of the inner body 10 is not particularly limited, but generally it is generally rectangular as shown in FIG.

  As the top sheet 11 that covers the front side (skin side) of the absorbent body 13, a non-woven or non-porous non-woven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the non-woven fabric may be synthetic fibers of olefin type such as polyethylene or polypropylene, polyester type, polyamide type etc., regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc. Spunlace method Nonwoven fabrics obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a meltblown method, a needle punch method or the like can be used.

  A liquid impermeable plastic sheet such as polyethylene or polypropylene can be used as the liquid impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent body 13, and in particular, it has moisture permeability from the viewpoint of dripping prevention. For example, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction can be suitably used.

  The absorbent 13 is a known one, for example, a pile of pulp fibers, an assembly of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing or fixing a superabsorbent polymer as necessary. Can be used. The absorbent body 13 can be packaged by a packaging sheet 14 having liquid permeability and liquid holding property, such as crepe paper, as necessary, for shape and polymer holding.

  The shape of the absorber 13 is formed in a substantially hourglass shape having a narrow portion 13N at the crotch portion which is narrower than the front and rear sides. The dimension of the constricted portion 13N can be determined as appropriate, but the longitudinal length of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest part is 40% of the total width of the absorbent 13 It can be about 60%. In the case of having such a constricted portion 13N, when the planar shape of the interior body 10 is substantially rectangular, the absorber 13 is not included in the portion corresponding to the constricted portion 13N of the absorber 13 in the interior body 10. An absorber side 17 is formed.

  The liquid impermeable sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the top sheet 11. As this liquid impermeable sheet 12, it is desirable to use an opaque sheet so as not to have brown color such as defecation and urine. As the opacification, a film formed by internally adding a pigment such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, barium sulfate or the like into a plastic and using it as a film is preferably used.

  On both sides of the interior body 10, solid gathers 90 fitted around the legs are formed. As shown in FIGS. 5 and 6, the three-dimensional gather 90 includes a fixing portion 91 fixed to the side of the back surface of the inner body 10, and the fixing portion 91 passing through the side of the inner body 10. Body 92 extending to the side of the surface of the body, and the front and rear ends of the body 92 are in a laid-down state by hot melt adhesive 95b or the like on the side of the surface (top sheet 11 in the illustrated example) It has a fixedly formed falling portion 93 and a free portion 94 formed non-fixed between the falling portions 93. Each of these parts is formed of a gather sheet 95 formed by folding a sheet such as non-woven fabric into a double sheet. The gather sheet 95 is attached over the entire front-rear direction of the inner body 10, the falling portions 93 are provided on the front and back sides of the non-absorbent side 17 and the free portions 94 are on both sides of the non-absorbent side 17 It is extended. Further, between the double gather sheets 95, a gather elastic member 96 is disposed at the tip of the free part or the like. The gather elastic member 96 is for raising the free portion 94 by an elastic contraction force as shown in FIG. 5 in the product state.

  The fixing structure of the gather elastic member 96 and the gather sheet 95 is not particularly limited. For example, as in the examples shown in FIGS. 5 and 6, except for the falling portion 93, the hot melt adhesive at the position of the gather elastic member 96 Although the gather elastic member 96 is adhesively fixed to the gather sheet 95 and the opposite surface of the gather sheet 95 is joined, in the falling portion 93, there is no hot melt adhesive at the position of the gather elastic member 96, and therefore gather elastic It is possible to adopt a structure in which the member 96 and the gather sheet 95 are not bonded and the opposite surface of the gather sheet 95 is not joined at the position where the gather elastic member 96 is present.

  As the gather elastic member 96, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, polyester and the like which are usually used can be used. Moreover, in order to make it hard to see from the outside, it is preferable to arrange the thickness at 925 dtex or less, the tension at 150 to 350%, and the interval at 7.0 mm or less. As the gather elastic member 96, in addition to the elongated shape as shown in the illustrated example, a tape-like member having a certain width can also be used.

  The material fibers constituting the above-mentioned gather sheet 95 are also synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, as well as synthetic fibers such as rayon and cupra, natural fibers such as cotton, etc. Although non-woven fabrics obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a meltblown method, a needle punch method or the like can be used as the fiber, in particular, the basis weight is It is preferable to use a non-woven fabric which is excellent in breathability by suppressing. Furthermore, as for the gather sheet 95, silicone type, paraffin metal type, alkylchromic chloride type water repellent, etc. in order to prevent permeation of urine and the like, to prevent run-out and to improve the feel (dry feeling) to the skin. It is desirable to use a water repellent treated non-woven fabric coated with.

  As shown in FIGS. 3 to 6, the inner surface of the inner body 10 is joined to the inner surface of the outer body 20 by a hot melt adhesive or the like in the inner and outer fixed area 10B (hatched area). The inside and outside fixed area 10B can be appropriately determined, and can be substantially the entire width direction WD of the inner body 10. However, it is preferable that both widthwise end portions are not fixed to the outer body 20.

(Example of structure of exterior body)
The exterior body 20 has at least a waist T of a front body F and a waist T of a rear body B. In the illustrated example, between the waist T of the front F and the waist T of the rear B It further has an intermediate portion L which is a range in the front-rear direction of. As shown in the illustrated example, the exterior body 20 may be located at the center side in the width direction from the side edge of the interior body 10 in the crotch portion, or may be located outside in the width direction.

  And in the exterior body 20 of the illustrated example, except for the middle in the front-rear direction of the middle portion L, as shown in FIG. 2 and FIG. 4 to FIG. The elastic sheet 30 is interposed between the layers 20B, and as shown in FIG. 9, the first sheet layer 20A and the second sheet layer 20B are separated by a large number of sheet junctions 40 arranged at intervals. The elastic sheet stretchable structure 20X is joined through the joint hole 31 penetrating the elastic sheet 30. The area having the elastic sheet stretch structure has a stretch area which is shrunk in the width direction by shrinkage of the elastic sheet and is stretchable in the width direction (that is, the stretch direction ED is the width direction WD of the diaper). doing.

  The first sheet layer 20A and the second sheet layer 20B may be indirectly joined via the elastic sheet 30, not through the joint holes 31 of the elastic sheet 30. The planar shape of the exterior body 20 is formed by concave line around the leg 29 so that the widthwise side edges of the middle portion L respectively form a leg opening, and has a shape resembling an hourglass as a whole. The exterior body 20 may be formed separately in the front body F and the back body B, and may be disposed so as to be separated in the crotch region in the front-rear direction LD of the diaper.

  Although the form shown in FIG. 1 and FIG. 2 is a form in which the elastic sheet stretchable structure 20X is extended to the waist end 23, if the elastic sheet stretchable structure 20X is used for the waist end 23, For example, as shown in FIGS. 7 and 8, the waist end 23 is not provided with the elastic sheet expansion and contraction structure 20X, and the expansion and contraction by the conventional elongated waist elastic member 24 is performed. A structure can also be provided. The waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction LD, and provides an elastic force so as to tighten the circumference of the trunk of the body. The waist elastic members 24 are not arranged substantially as one bundle at close intervals, but three or more at intervals of about 3 to 8 mm in the front-rear direction so as to form a predetermined stretch zone. , Preferably five or more. Although the extension rate at the time of fixation of the waist part elastic member 24 can be determined suitably, in the case for normal adults, it can be made into about 230 to 320%. Although a rubber thread is used as the waist portion elastic member 24 in the illustrated example, for example, another elongated elastic member such as a plain rubber may be used. Although not shown, the elastic sheet 30 may be provided at the waist end 23, and an elongated waist elastic member 24 may be provided at a position overlapping with the elastic sheet 30 so as to have an elastic structure by both elastic members. Further, in the illustrated embodiment, the edge portion of the leg opening in the exterior body 20 is not provided with an elongated elastic member extending along the leg opening, but the edge portion is at a position overlapping with the elastic sheet 30 or the edge Instead of the elastic sheet 30 of the portion, an elongated elastic member may be provided.

  As another form, although not shown, the elastic sheet stretchable structure 20X is not provided at the intermediate portion L between the waist T of the front body F and the waist T of the back body B, or the front body An elastic sheet stretchable structure 20X is continuously provided in the front-rear direction LD from the inside of the waist portion T of F through the middle portion L to the inside of the waist portion T of the back body B, or any one of the front body F and the back body B An appropriate deformation is also possible such as providing the elastic sheet stretchable structure 20X only in the above.

(Stretch area)
The area | region which has the elastic sheet expansion-contraction structure 20X in the exterior body 20 has an expansion-contraction area | region which can expand-contract in the width direction WD. In the elastic region 80, the elastic sheet 30 is contracted in the width direction WD by the contraction force of the elastic sheet 30, and is extensible in the width direction WD. More specifically, in a state in which the elastic sheet 30 is expanded in the width direction WD, the elastic sheet 30 is spaced apart in the width direction WD and the longitudinal direction LD orthogonal to this (the direction LD orthogonal to the expansion and contraction direction). The first sheet layer 20A and the second sheet layer 20B are bonded through the bonding holes 31 to form a large number of sheet bonding portions 40, thereby forming the elastic sheet expansion and contraction structure 20X. Are arranged uninterruptedly in the width direction WD, and the sheet bonding portion 40 is arranged such that the first sheet layer 20A and the second sheet layer 20B are contracted by the contraction force of the elastic sheet 30 to form the contraction ridge 25. Such elasticity can be imparted by this.

  In the elastic region 80, even if the elastic sheet 30 has a portion 32 linearly continuous along the width direction WD as shown in FIG. 9, the example shown in FIG. 11 and the example shown in FIG. You do not need to have it.

  It is preferable that the arrangement pattern of the sheet bonding portion 40 of the stretchable area 80 is as shown in the example shown in FIG. 9, the example shown in FIG. 11, and the example shown in FIG. That is, in these examples, in the expansion / contraction area 80, an acute angle (sharp angle side intersection angle θ1) with respect to the expansion / contraction direction ED as non-bonding bands 51, 52 in which a portion without the sheet bonding portion 40 is continuous in the expanded state. The first non-bonding zone 51 linearly continuous along the first direction 51d intersecting with is repeatedly present at an interval in a direction orthogonal to the first direction 51d. Further, a large number of sheet bonding portions 40 and bonding holes 31 are provided at intervals between adjacent first non-bonding bands 51 in the stretchable region 80. Characteristically, a unit structure including a plurality of first non-bonding bands 51 having different first widths 51w determined as widths in a direction orthogonal to the first direction 51d is orthogonal to the first direction 51d in the stretchable region 80. It exists repeatedly in the direction.

  As described above, when the unit structure including the plurality of first non-bonding bands 51 having different first widths 51 w is repeatedly present in the direction orthogonal to the first direction 51 d in the stretchable area 80, the inside of the first non-bonding bands 51 In the continuous portion of the elastic sheet 30, the same magnitude change in width is formed. That is, if the width 51w of the first non-bonding band 51 is narrow, the width of the continuous portion of the elastic sheet 30 inside is also narrow, and if the width 51w of the first non-bonding band 51 is wide, the continuous of the elastic sheet 30 inside The width of the department also increases. Then, when there is a change in the first width 51w in the continuous portion of the elastic sheet 30 in the first non-bonding zone 51, the continuous portion of the elastic sheet 30 in the wide first non-bonding zone 51 and the narrow width (1) Both continuous portions of the elastic sheet 30 in the non-bonding zone 51 are visually emphasized, so that even in the natural length state (see FIGS. 13 and 17), the expansion and contraction region 80 is in a partially expanded state Even if there is, it will have a beautiful appearance with diagonal stripes.

  In the natural length state, as shown in FIG. 9 and FIG. 14 (b), the expansion and contraction region expands in the direction in which the first sheet layer 20 A and the second sheet layer 20 B between the sheet bonding portions 40 separate from each other, A contraction weir 25 extending to the LD is formed, and the contraction weir 25 is extended although it is extended even in the mounted state where it is extended to some extent in the width direction WD. Therefore, in the contracted state to some extent, the size of the contraction ridge 25 in the first non-bonding zone 51 changes in accordance with the first width 51 w of the first non-bonding zone 51. Striped patterns will appear more clearly. Further, as in the illustrated embodiment, the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40. As seen from FIG. 9C assuming the mounted state and FIG. 9A assuming the expanded state of the first sheet layer 20A and the second sheet layer 20B, in these states, the elastic sheet 30 is used. A gap is formed between the bonding hole 31 and the sheet bonding portion 40, and even if the material of the elastic sheet 30 is a non-porous film or sheet, air permeability is added by the gap. In particular, in the case where the elastic sheet 30 has the portion 32 linearly continuous along the width direction WD, in the natural length state, the joint hole 31 is narrowed due to the further contraction of the elastic sheet 30, and the joint hole is formed. In the case where a gap is hardly formed between the sheet 31 and the sheet bonding portion 40, and the elastic sheet 30 does not have a linearly continuous portion along the width direction WD, the bonding hole 31 and the sheet bonding portion A gap remains with 40.

  The unit structure described above is not limited by the magnitude of the width 51 w as long as it includes a plurality of first non-junction bands 51 having different first widths 51 w. The width 51w is preferably 1.2 to 60 times larger and 0.01 to 0.8 times smaller than the nearest first non-bonding zone 51 of width 51w.

  Furthermore, as long as the unit structure described above includes a plurality of first non-junction bands 51 having different first widths 51 w, the first widths 51 w of all the first non-junction bands 51 may be different, as shown in FIG. As described above, the first width 51 w of some of the plurality of first non-junction bands 51 may be different from the first width 51 w of the other one or more first non-junction bands 51.

  Even if an oblique stripe pattern along the first direction 51 d by the contraction ridge 25 of the first non-bonding band 51 and the continuous part of the elastic sheet 30 inside thereof appears in the expansion and contraction area 80, the other expansion and contraction area 80 If the diagonal stripe pattern along the diagonal direction is more strongly recognized, the diagonal stripe pattern due to the continuous portion of the contraction ridge 25 of the first non-bonding zone 51 and the elastic sheet 30 inside thereof may be inconspicuous. On the other hand, the maximum value of the first width 51w in the first non-bonding zone 51 is the maximum value of the width in the direction orthogonal to the continuous direction in all the non-bonding zones 51 and 52 having different inclination directions and in common. This is preferable because in the stretchable area 80, the diagonal stripes formed by the contraction ridges 25 of the first non-bonding band 51 and the continuous portion of the elastic sheet 30 inside the first bonding bands 51 become more strongly visible. In this case, the maximum value of the first width 51w in the first non-bonding zone 51 can be determined as appropriate, but it is 1.2 to 60 times the nearest first non-bonding zone 51 of width 51w. preferable. Although all the non-bonding bands 51 and 52 including the first non-bonding band 51 are not limited in width in the direction orthogonal to the continuous direction, they are usually within the range of 0.02 to 5 mm. Is preferred. Needless to say, the width of the non-bonding bands 51 and 52 in the direction orthogonal to the continuous direction is the first width 51 w in the first non-bonding band 51 and is a portion that is linearly continuous. Because it is equal width.

  The first interval 51s defined as an interval in a direction orthogonal to the first direction 51d in the adjacent first non-bonding bands 51 can be appropriately determined. Therefore, the first interval 51s may be the same as, wider than, or smaller than the first width 51w of the adjacent first non-bonding bands 51. One preferable example is a mode in which the maximum value of the first width 51 w in the first non-bonding zone 51 in the unit structure is smaller than the maximum value of the first interval 51 s. Thus, by forming the wide interval portion in the unit structure, the diagonal stripe pattern by the continuous ridge of the contraction ridge 25 of the first non-bonding zone 51 and the elastic sheet 30 inside thereof becomes more visible . In this case, the maximum value of the first width 51w in the first non-bonding zone 51 can be appropriately determined, but is preferably 0.01 to 9 times the maximum value of the first interval 51s. In addition, although the space | interval of the direction orthogonal to the continuous direction in all the no bonding bands 51 and 52 containing the 1st no bonding band 51 is not specifically limited, It is in the range of 0.3-50 mm in the case of usual. Is preferred. Needless to say, the distance between the non-bonding bands 51 and 52 in the direction orthogonal to the continuous direction is the first distance 51s in the first non-bonding band 51 and is equal to the continuous direction. .

  In the stretchable region 80, as the non-bonding bands 51 and 52, a second continuous straight line is formed along a second direction 52d intersecting an acute angle (the acute angle side crossing angle θ2) with respect to the stretch direction ED other than the first direction 51d. The two non-bonding bands 52 may be repeatedly present at intervals in the direction orthogonal to the second direction 52 d, or the second non-bonding bands 52 may not exist. In one preferable embodiment having the second non-bonding zone 52, the non-bonding zones 51 and 52 are formed in a diagonal grid shape in the expansion and contraction region 80, and the first non-bonding zone 51 is a non-junction It is a portion which is continuous in one direction in the bands 51, 52, and the second non-bonding zone 52 is a portion which is continuous in the other direction in the non-bonding zones 51, 52 in the oblique grid shape. In this case, in the first direction 51 d and the second direction 52 d, the positive and negative inclinations with respect to the expansion and contraction direction ED are opposite to each other. Incidentally, even in the form without the non-bonding bands 51 and 52 continuous in the width direction WD (stretching direction ED) as in the example shown in FIG. 11 and the example shown in FIG. The stretchability in the stretchable region 80 is sufficiently ensured by the acute angle side crossing angles θ1 and θ2 of the first direction 51d and the second direction 52d with respect to the stretch direction ED being 5 to 45 degrees, particularly 10 to 30, respectively. Can.

  However, when the diagonal stripe pattern along the oblique direction of the second non-bonding zone 52 is more strongly recognized in the same stretchable area 80, the contraction ridge 25 of the first non-bonding zone 51 and the continuous portion of the elastic sheet 30 inside thereof There is a risk that the diagonal stripes due to Therefore, when the second non-bonding zone 52 is provided as in the example shown in FIG. 15, all the second widths 52w defined as widths in the direction orthogonal to the second direction in the second non-bonding zone 52 are the same, or It is desirable to arrange the sheet bonding portion 40 so as not to have the second non-bonding band 52. As a result, in the stretchable area 80, the diagonal stripes formed by the contraction ridges 25 of the first non-bonding band 51 and the continuous portion of the elastic sheet 30 inside the first bonding bands 51 become more visible.

  It is desirable that the maximum elongation in the width direction WD of the stretchable region 80 be 190% or more (preferably 200 to 220%). The maximum elongation of the expansion and contraction region 80 is substantially determined by the expansion rate of the elastic sheet 30 at the time of manufacture, but is basically reduced by the factor that inhibits the contraction in the width direction WD. The main factor of such an inhibition factor is the ratio of the length L of the sheet bonding portion 40 to the unit length in the width direction WD, and the maximum elongation decreases as the ratio increases. In a normal case, since the length L of the sheet bonding portion 40 has a correlation with the area ratio of the sheet bonding portion 40, the maximum elongation of the stretchable region 80 can be adjusted by the area ratio of the sheet bonding portion 40.

  When the elastic sheet 30 has a portion 32 which is linearly continuous along the width direction WD as in the example shown in FIG. The adjustment can be made by the sum (equal to the joint hole distance 31d) of the orthogonal direction dimension 32w of the linearly continuous portion 32 (see FIG. 9A) along the direction WD. On the other hand, as in the example shown in FIG. 11 and the example shown in FIG. 15, when the elastic sheet 30 does not have a portion which continues linearly along the width direction WD, the non-bonding bands 51 and 52 are continuous. It can be adjusted by the crossing angle formed by the direction and the expansion / contraction direction ED. In the normal case, the acute angle side intersection angles θ1 and θ2 formed by the continuous direction of the non-bonding bands 51 and 52 and the expansion / contraction direction ED in the unfolded state are larger than 0 degrees It is preferable to set it as 45 degrees or less, especially 10 to 30 degrees.

The area ratio of the sheet bonding portion 40 in the stretchable region 80 and the area of each sheet bonding portion 40 can be determined as appropriate, but in the normal case, it is preferable to be in the following range.
Area of sheet bonding portion 40: 0.14 to 3.5 mm ² (especially 0.14 to 1.0 mm ² )
Area ratio of sheet bonding portion 40: 1.8 to 19.1% (particularly, 1.8 to 10.6%)

  Thus, since the maximum elongation and expansion stress of the stretchable area 80 can be adjusted by the area of the sheet bonding portion 40, a plurality of areas having different area ratios of the sheet bonding portion 40 in the stretchable area 80 as shown in FIG. It is possible to change the fit according to the site. In the embodiment shown in FIG. 7, the edge area 82 of the leg opening has a high area ratio of the sheet bonding portion 40 as compared with the other areas, and hence the expansion stress is weak, and the area is a flexible area.

  The shape of the individual sheet bonding portion 40 and the bonding hole 31 in the natural length state can be determined as appropriate, but it may be a perfect circle, an oval, a triangle, a rectangle (see FIGS. 9, 11 and 15), a rhombus (see FIG. The shape may be an arbitrary shape such as a polygon such as 10 (b) or a convex lens (see FIG. 10 (a)), a concave lens (see FIG. 10 (c)), a star or a cloud. The dimensions of the individual sheet joints are not particularly limited, but the maximum length 40y (approximately equal to the dimension 31y in the orthogonal direction of the joint holes 31) is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. The maximum width 40x is preferably 0.1 to 3.0 mm, particularly 0.1 to 1.1 mm in the case of a long shape in the direction XD orthogonal to the expansion and contraction direction.

  On the other hand, the sheet bonding portion 40 is aligned in the first direction 51 d between the adjacent first non-bonding bands 51. In this case, for example, as shown in FIG. When the acute angle side crossing angle θ3 of the longitudinal direction with respect to the direction orthogonal to the direction ED is 10 degrees or less and the maximum dimension 40e of the stretching direction ED is a slender shape of 0.1 to 0.4 mm, the first bonding-free zone Since the dimension of the expansion-contraction direction ED of 51 can be ensured larger and the fall of elasticity can be suppressed, it is preferable.

  Further, as in the example shown in FIG. 11, the wide first non-bonding zone 51 where the first width 51 w is maximum and the narrow first non-bonding zone 51 where the first width 51 w is narrower When a plurality of adjacent ones are included in the direction orthogonal to the first direction 51d, the acute angle side crossing angle in the longitudinal direction with respect to the second direction 52d is within 5 degrees between the adjacent wide first non-bonding bands 51, And it is preferable that the elongate sheet | seat junction part 40 which makes the largest dimension 40f of the direction orthogonal to the longitudinal direction which is 0.1-0.4 mm is spaced apart and arrange | positioned in the 1st direction 51d. Further, between the adjacent narrow first non-bonding bands 51, the acute angle side crossing angle θ3 in the longitudinal direction with respect to the first direction 51d is 45 degrees or more, and the maximum dimension 40g in the direction orthogonal to the longitudinal direction is 0. It is preferable that an elongated sheet bonding portion 40 having a length of 1 to 0.4 mm be aligned at intervals in the first direction 51 d. With such a shape and arrangement of the sheet bonding portion 40, the contraction ridges 25 of the first non-bonding band 51 and the continuous portion of the elastic sheet 30 inside thereof are particularly visually emphasized with less area of the sheet bonding portion 40. Become so.

  The row (the row in the continuous direction of the non-bonding bands 51 and 52) of the sheet bonding portion 40 located between the non-bonding bands 51 and 52 adjacent to each other may be one or more. Also, although it is preferred that the spacing of the sheet joints 40 in the row direction be regular, not all spacings need be constant, and some spacings may be different.

(Non-stretchable area)
A non-stretchable region 70 can be provided on at least one side in the width direction of the stretchable region 80 in the region having the elastic sheet stretchable structure 20X in the exterior body 20, as shown in FIG. The non-stretchable area 70 means that the maximum elongation in the stretch direction is 120% or less. The maximum elongation of the non-stretchable region 70 is preferably 110% or less, and more preferably 100%. The arrangement of the stretchable region 80 and the non-stretchable region 70 can be determined as appropriate. In the case of the exterior body 20 of the underpants type disposable diaper as in this example, a portion overlapping with the absorber 13 is a region that does not require expansion and contraction, so a part or all of the portion overlapping with the absorber 13 It is preferable to make the non-stretchable region 70 preferably) to include substantially the whole of the inner and outer fixation regions 10B. Of course, the non-stretchable region 70 can be provided from the region overlapping the absorber 13 to the region not overlapping the absorber 13 located in the width direction WD or the longitudinal direction LD, and the non-stretch region only in the region not overlapping the absorber 13 70 can also be provided.

  The shape of each sheet bonding portion 40 in the non-stretchable region 70 is not particularly limited, and can be appropriately selected from the same shape as that described in the stretchable region 80 section.

Moreover, although the area ratio of the sheet bonding portion 40 in the non-stretchable region and the area of each sheet bonding portion 40 can be appropriately determined, the area of each sheet bonding portion 40 is small in the normal range in the following range. And since the area ratio of the sheet | seat junction part 40 is low and the non-stretching area | region 70 becomes hard, it is preferable.
Area of sheet bonding portion 40: 0.10 to 0.75 mm ² (particularly 0.10 to 0.35 mm ² )
Area ratio of sheet bonding portion 40: 4 to 13% (especially 5 to 10%)

  The non-stretchable region 70 can be formed by closely arranging the sheet bonding portions 40 so that the first sheet layer and the second sheet layer do not shrink due to the contraction force of the elastic sheet 30 to form wrinkles. As a specific example of the formation method of the non-stretchable area | region 70, what is shown by patent 5980355, patent 5918877, patent 5980367, patent 6049228, for example can be mentioned.

(Joint structure of sheet joint)
When the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 are bonded through the bonding holes 31 formed in the elastic sheet 30, at least the first sheet layer 20A and the second sheet layer 20 in the sheet bonding portion 40. It is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except between the sheet layers 20B.

  The means for bonding the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 is not particularly limited. For example, the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 may be bonded by a hot melt adhesive or by bonding means such as heat sealing or ultrasonic sealing. .

  When the first sheet layer 20A and the second sheet layer 20B are bonded through the bonding holes 31 of the elastic sheet 30 in the sheet bonding portion 40, the form in which the sheet bonding portion 40 is formed by material welding is the first form in the sheet bonding portion 40. A first welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by the molten solidified material 20m of at least one of the one sheet layer 20A and the second sheet layer 20B (FIG. 18 (a 18) a second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by the whole or most or a part of the solidified part 30m of the elastic sheet 30 in the sheet joining portion 40 (FIG. 18 (FIG. b) see, and any of the third welding forms (see FIG. 18 (c)) in which both of them are combined, but the second and third welding forms are preferred. .

  Particularly preferable is the first sheet layer by 20 m of the solidified part of the first sheet layer 20 A and the second sheet layer 20 B and 30 m of the solidified part of all or most of the elastic sheet 30 in the sheet bonding portion 40. It is a form by which 20A and the 2nd sheet layer 20B are joined. In the third welding mode shown in FIG. 20 (b), the elastic sheet 30 appears in white between the melted and solidified materials 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B appearing in black. In the first welding mode shown in FIG. 20 (a), the elastic sheet 30 is formed between the molten and solidified material 20m of the fibers of the first sheet layer 20A or the second sheet layer 20B, while 30 m of the molten and solidified material is observed. There is no melting and solidification of

  As in the first and third bonding modes, the first sheet layer 20A and the second sheet layer 20A with the molten solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B as an adhesive. When joining the sheet layer 20B, it is preferable not to melt part of the first sheet layer 20A and the second sheet layer 20B because the sheet bonding portion 40 is not hardened.

  In addition, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the core of all the fibers of the sheet bonding portion 40 is that the first sheet layer 20A and the second sheet layer 20B are not partially melted. In the composite fiber, not only the core but also the central part of the monocomponent fiber remains, but its surrounding part (including not only the sheath of the composite fiber but also the part on the surface side of the monocomponent fiber) The fibers are not melted at all, but the remaining fibers are all melted or the core remains, but the surrounding portion includes a melted form.

  When the first sheet layer 20A and the second sheet layer 20B are joined using the melted and solidified material 30m of the elastic sheet 30 as an adhesive as in the second welding mode and the third welding mode, the peel strength is high. In the second welding mode, the first sheet layer 20A is formed under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30 and the heating temperature at the time of forming the sheet bonding portion 40. The elastic sheet 30 is sandwiched between the second sheet layer 20B, and a portion to be the sheet bonding portion 40 is pressurized and heated, and only the elastic sheet 30 is melted.

  On the other hand, in the third welding mode, between the first sheet layer 20A and the second sheet layer 20B under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30. It can be manufactured by sandwiching the elastic sheet 30, pressing and heating a portion to be the sheet bonding portion 40, and melting the elastic sheet 30 with at least one of the first sheet layer 20A and the second sheet layer 20B.

  From such a viewpoint, the melting point of the elastic sheet 30 is preferably about 80 to 145 ° C., and the melting points of the first sheet layer 20A and the second sheet layer 20B are about 85 to 190 ° C., particularly about 150 to 190 ° C. The difference between the melting point of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic sheet 30 is preferably about 60 to 90.degree. Moreover, it is preferable to make heating temperature into about 100-150 degreeC.

  In the second welding mode and the third welding mode, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the melted and solidified product 30m of the elastic sheet 30 is a sheet bonding portion as shown in FIG. 40 may penetrate between the fibers throughout the thickness direction of the first sheet layer 20A and the second sheet layer 20B, but as shown in FIG. As shown in FIG. 19B, the flexibility of the sheet bonding portion 40 is higher in the mode in which the fibers hardly penetrate between the fibers of the first sheet layer 20A and the second sheet layer 20B.

FIG. 21 shows an example of an ultrasonic sealing device suitable for forming the second welding mode and the third welding mode. In this ultrasonic sealing device, when forming the sheet bonding portion 40, the first sheet layer 20A, between the anvil roll 60 having the projections 60a formed in the pattern of the sheet bonding portion 40 on the outer surface, and the ultrasonic horn 61, The elastic sheet 30 and the second sheet layer 20B are fed. At this time, for example, the feed drive roll 63 and the nip roll 62 are set by making the feed transfer speed by the feed drive roll 63 and the nip roll 62 of the elastic sheet 30 on the upstream side slower than the transfer speeds of the anvil roll 60 and the ultrasonic horn 61 and thereafter. The elastic sheet 30 is stretched in the MD direction (machine direction, flow direction) to a predetermined elongation rate in a path from the nip position by the to the seal position by the anvil roll 60 and the ultrasonic horn 61. The extension ratio of the elastic sheet 30 can be set by selecting the speed difference between the anvil roll 60 and the feed driving roll 63, and can be set, for example, to about 300% to 500%. 62 is a nip roll.
The first sheet layer 20A, the elastic sheet 30, and the second sheet layer 20B, which are fed between the anvil roll 60 and the ultrasonic horn 61, are laminated in this order with the protrusion 60a and the ultrasonic horn 61. Heating is performed by the ultrasonic vibration energy of the ultrasonic horn 61 while pressing between them to melt only the elastic sheet 30 or melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30. At the same time as forming the bonding holes 31 in the elastic sheet 30, the first sheet layer 20A and the second sheet layer 20B are bonded through the bonding holes 31. Therefore, in this case, the area ratio of the sheet bonding portion 40 is selected by selecting the size, shape, separation distance, arrangement pattern of the roll length direction and roll circumferential direction, and the like of the projection 60 a of the anvil roll 60. Can.

  The reason why the bonding hole 31 is formed is not necessarily clear, but it is considered that the portion of the elastic sheet 30 corresponding to the projection 60 a of the anvil roll 60 is melted and separated from the periphery to open the hole. At this time, as shown in FIG. 9A, FIG. 12 and FIG. 13, portions of the elastic sheet 30 between the adjacent bonding holes 31 aligned in the expansion / contraction direction ED Since it is cut and loses the support on both sides in the contraction direction, the contraction is performed until the center side of the direction LD orthogonal to the expansion / contraction direction ED is balanced in the expansion / contraction direction center within a range in which the continuity in the direction orthogonal to the contraction direction can be maintained. The bonding hole 31 is expanded in the expansion and contraction direction ED.

  The components of the first sheet layer 20A and the second sheet layer 20B have translucency and can be used without particular limitation as long as it is a sheet-like material that allows the elastic sheet 30 to be visible, but it has air permeability. Is preferred. Therefore, it is preferable to use a nonwoven fabric from these viewpoints and a viewpoint of a softness | flexibility. The non-woven fabric is not particularly limited as to its raw material fiber. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., mixed fibers of which two or more are used, composite fibers Etc. can be illustrated. Furthermore, the non-woven fabric may be produced by any processing.

The fiber bonding method in the non-woven fabric may be any of chemical means such as adhesive and solvent, physical means such as heating, or so-called entanglement, for example, spunlace method, spunbond method, thermal bond method, meltblown method, A needle punch method, an air through method, a point bond method or the like can be adopted. When using a nonwoven fabric, it is preferable to make the fabric weight into about 10-25 g / m < ² >. In addition, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one sheet of material is folded back to be opposed. For example, as shown in the illustrated embodiment, at the waist end 23, the component positioned outside is the second sheet layer 20B, and the folded portion 20C formed by being folded back to the inner surface at the waist opening edge is the first sheet layer 20A. The elastic sheet 30 is interposed between the elastic sheet 30 and the first sheet layer 20A, and the second sheet layer 20B is an elastic sheet 30 interposed therebetween. It can be intervened. Of course, the constituent of the first sheet layer 20A and the constituent of the second sheet layer 20B are individually provided over the entire longitudinal direction LD, and the constituent of the first sheet layer 20A and the second sheet are not folded. The elastic sheet 30 can be interposed between the components of the layer 20B.

  The elastic sheet 30 is not particularly limited, and as long as it is a thermoplastic resin sheet having elasticity by itself, it may be an elastic nonwoven fabric as well as an elastic film. Further, as the elastic sheet 30, in addition to the non-porous sheet, a sheet in which a large number of holes and slits are formed for ventilation can be used. In particular, the tensile strength in the width direction WD (stretching direction ED, MD direction) is 8 to 25 N / 35 mm, the tensile strength in the front-rear direction LD (direction XD orthogonal to the stretching direction, CD direction) is 5 to 20 N / 35 mm, width direction It is preferable that the elastic sheet 30 has a tensile elongation of 450 to 1050% in WD and a tensile elongation of 450 to 1400% in the longitudinal direction LD. The thickness of the elastic sheet 30 is not particularly limited, but preferably about 20 to 40 μm.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise indicated in the specification.
"Front body" and "back body" mean front and rear portions of the pants-type disposable diaper, respectively, bordering on the front-rear direction center. In addition, the crotch refers to a range in the front-rear direction including the center in the front-rear direction of the pants-type disposable diaper, and when the absorber has a constricted portion, it refers to the longitudinal range of the portion having the constricted portion.
-"Maximum elongation" means the maximum value of the elongation in the expansion / contraction direction ED (in other words, the expansion in the unfolded state in which the first sheet layer and the second sheet layer unfold flatly without shrinkage or slack) The length is expressed as a percentage when the natural length is 100%.
-"Area ratio" means the ratio of the target portion to the unit area, and the target portion (for example, the sheet bonding portion 40, the opening of the bonding hole 31), the vent hole in the target region (for example, the stretchable region 80, the non-stretchable region 70) The total area of (A) is divided by the area of the target area and expressed as a percentage, and in particular, the "area ratio" in the area having a stretchable structure means the area ratio in a developed state. In the embodiment in which a large number of target portions are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target portions and to obtain the area ratio.
"Stretch rate" means the value when natural length is 100%.
・ "Age" is measured as follows. After the sample or test piece is predried, it is left in a test room or apparatus under standard conditions (test place: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to be in a constant weight state. Pre-drying refers to bringing a sample or test piece to a constant weight in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture percentage is 0.0%. From a test piece in a constant weight state, using a template for sampling (100 mm × 100 mm), cut out a sample of 100 mm × 100 mm in size. The weight of the sample was measured, 10 0 times to calculate the weight per square meter, a basis weight.
・ The “thickness” of the absorber is the thickness measuring instrument of Ozaki Manufacturing Co., Ltd. (Pecock, Dial Thickness Gauge Large Type, Model J-B (Measurement Range 0 to 35 mm) or Model K-4 (Measurement Range 0 to 50 mm)) Measure with the sample and thickness gauge horizontal.
- other than the above "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 0.098 N / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
・ “Tensile strength” and “Tensile elongation (breaking elongation)” conform to JIS K 7127: 1999 “Plastic-Test method of tensile properties-” except that the test piece is made into a rectangular shape of 35 mm wide × 80 mm long. It means that the initial chuck distance (marked line distance) is 50 mm and the tensile speed is 300 mm / min. For example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile tester.
· “Tensile stress” is a tensile test based on JIS K 7127: 1999 “Plastic-Test method for tensile properties-” with an initial chuck spacing (marked line distance) of 50 mm and a tensile speed of 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. Although it is preferable to make a test piece into a rectangular shape with a width of 35 mm and a length of 80 mm or more, when a test piece with a width of 35 mm can not be cut out, a test piece is made with a width that can be cut out and the measured value is 35 mm wide The value converted to In addition, even when the target area is small and sufficient test pieces can not be collected, at least comparison can be made as long as test pieces of the same size are used even if the small test pieces are appropriately compared if the magnitude of the extension stress is compared. . For example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile tester.
"Expanded state" means a flat state without contraction or slack.
-Unless otherwise indicated, the dimension of each part means the dimension in the unfolded state, not the natural length state.
・ If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in the test room or equipment under the standard condition (test place: temperature 23 ± 1 ° C, relative humidity 50 ± 2%) Do.

  The present invention is applicable to various types of disposable diapers such as a tape type and a pad type other than the pants type disposable diaper as in the above example, as long as the elastic sheet stretchable structure is applicable. It can be used as a stretchable member in general disposable wear articles such as disposable wear articles for water play.

  DESCRIPTION OF SYMBOLS 10 ... Interior body, 10B ... Inside-and-outside fixed area | region 11 ... Top sheet, 12 ... Liquid-impervious sheet, 13 ... Absorbent body, 13N ... Bump part, 14 ... Packaging sheet, 17 ... Non-absorber side part, 20 ... Exterior body 20A: first sheet layer, 20B: second sheet layer, 20C: folded portion, 20X: elastic film stretch structure, 21: side seal portion, 23: waist end area, 24: waist elastic member, 25: shrinkage襞, 29: leg line line, 30: elastic sheet, 31: bonding hole, 40: sheet bonding portion, 51, 52: non-bonding zone, 51: first non-bonding zone, 51 d: first direction, 51s: first Spacing, 51 w: first width, 52: second non-bonding zone, 52 d: second direction, 70: non-stretching area, 80: stretching area, 90: solid gather, 93: falling part, 94: free part, 95: ... Gather sheet, 96 ... Heather resilient and elastic members, B ... back body, ED ... stretching direction, F ... front body, L ... intermediate portion, LD ... front-rear direction, T ... waist portion, WD ... width direction.

Claims (8)

An elastic sheet is interposed between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are connected through the elastic sheet at a plurality of sheet bonding portions arranged at intervals. Having an elastic sheet stretchable structure joined through a hole or via the elastic sheet,
The first sheet layer and the second sheet layer are formed of a translucent material, and the elastic sheet is visible through the first sheet layer and the second sheet layer.
The area having the elastic sheet expansion / contraction structure has an expansion / contraction area which is contracted in the expansion / contraction direction by the contraction of the elastic sheet and is extensible in the expansion / contraction direction,
In the expansion / contraction area, in the unfolded state, as a non-bonding zone in which a portion having no sheet bonding portion is continuous, a first non-bonding continuously continuing linearly along a first direction intersecting an acute angle with the expansion / contraction direction Bands are repeatedly present at intervals in a direction orthogonal to the first direction,
A large number of the sheet bonding portions and the bonding holes are provided at intervals between the adjacent first non-bonding bands in the stretchable region,
A unit structure including a plurality of first non-bonding bands having different first widths determined as widths in a direction orthogonal to the first direction is repeatedly present in a direction orthogonal to the first direction in the stretchable region.
Expandable member characterized in that.   The stretchable member according to claim 1, wherein the maximum value of the first width in the first non-bonding zone is the maximum value of the width in a direction orthogonal to the continuous direction in all the non-bonding zones.   In the unit structure, the maximum value of the first width in the first no-bonding zone is larger than the maximum value of the first interval in the direction orthogonal to the first direction in the adjacent first no-bonding zone. The telescopic member according to claim 1, which is small. In the stretchable area,
As the non-bonding zone, a second non-bonding zone linearly continuous along a second direction other than the first direction and intersecting at an acute angle with the expansion / contraction direction is an interval in a direction orthogonal to the second direction Or the second widths which are determined as the widths in the direction orthogonal to the second direction in these second no-bonding zones are all the same, or
Does not have the second non-bonding zone,
The expansion-contraction member of any one of Claims 1-3. In the stretchable region, the non-bonding zone is formed in a diagonal grid shape,
The first bonding-free zone is a portion which is continuous in one direction in the diagonal grid-like bonding-free zone,
The second bonding-free zone is a portion continuous in the other direction in the diagonal grid-like bonding-free zone,
In the first direction and the second direction, positive and negative inclinations with respect to the expansion and contraction direction are opposite to each other,
In the unfolded state of the stretchable region, acute angle side crossing angles with respect to the stretch direction in the first direction and the second direction are each 5 to 45 degrees.
The expandable member according to claim 4. All the sheet bonding portions in the stretchable region have a slender shape having an acute angle side crossing angle of 10 degrees or less in the longitudinal direction with respect to the direction orthogonal to the stretch direction and a maximum dimension of 0.1 to 0.4 mm in the stretchable direction. ing,
The expandable member according to claim 5. The unit structure is adjacent to the wide first non-bonding zone where the first width is maximum and the narrow first non-bonding zone narrower than the first width in the direction orthogonal to the first direction. Including multiple bottles,
Between the adjacent wide first non-bonding zones, a narrow strip having an acute angle side crossing angle of 5 degrees or less in the longitudinal direction with respect to the second direction and a dimension of 0.1 to 0.4 mm in the direction orthogonal to the longitudinal direction Sheet junctions are spaced apart and aligned in the first direction;
Between the adjacent narrow first non-bonding zones, the acute angle side crossing angle in the longitudinal direction with respect to the first direction is 45 degrees or more, and the dimension in the direction orthogonal to the longitudinal direction is 0.1 to 0.4 mm The elongated sheet joints are spaced apart in the first direction,
The expandable member according to claim 5. An integral exterior body extending from the front to the back, or an exterior provided separately for the front and the back, and an interior extending to the front and back of the crotch attached to the widthwise middle of the exterior. A disposable pants-type wearable article comprising a side seal portion in which both sides of an exterior body in a front body and both sides of an exterior body in a back body are joined, and a waist opening and a pair of left and right legs. ,
The outer package according to at least one of the front body and the back body according to any one of claims 1 to 7 over a corresponding width direction range between the side seal portions in at least a partial range in the front-rear direction. It is an elastic member provided with an elastic sheet elastic structure so that the expansion-contraction direction of the elastic region becomes the width direction,
Disposable wear article characterized in that.

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