JP6124282B2 - Absorbent article and method for forming fit stretchable part - Google Patents

Description

  The present invention relates to an absorbent article in which a stretchable part for fitting is formed by fixing an elongated elastic elastic member in an extended state, and in particular, it is difficult to have a tightening trace of the elongated elastic elastic member, and it is thin and clean for that. It is related with the absorbent article provided with the expansion-contraction part for a fit which exhibits the external appearance.

  For example, a pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.

  In a pants-type disposable diaper, in order to improve the fit to the body, an elongated elastic elastic member such as rubber thread is fixed in an extended state at various locations on the exterior sheet to constitute a fitting elastic part. Among them, a waist edge elastic elastic member along the width direction at the edge of the waist opening, and a waist lower elastic elastic member along the width direction at the crotch side than the waist edge elastic elastic member Has a relatively high body fit and is widely used.

  On the other hand, a tape-type disposable diaper has a crotch part, a ventral part extending to the front side of the crotch part, a back side part extending to the rear side of the crotch part, and a fastening projecting from both sides of the back part. It has a tape and a target tape that is located on the outer surface of the abdomen and to which the fastening tape is connected. When wearing it on the body, turn the fastening tape from both sides of the waist to the outer surface of the abdomen and use it as the target tape. It has a structure to connect. Such a tape-type disposable diaper is used not only for infants but also widely used for nursing care (adult use). In general, tape-type disposable diapers are inferior in fit in the waistline direction compared to pants-type disposable diapers, and in order to improve this, elongated elastics such as rubber thread along the width direction on the waistline part of the back side part An expansion / contraction member is provided to form a fit expansion / contraction section.

  Furthermore, in recent years, a plurality of elongated elastic elastic members that can be expanded and contracted independently of both sheet materials are arranged in a non-joined portion between two sheet materials joined by joint portions provided intermittently, Techniques (see Patent Documents 1 to 3) for forming a fitting stretchable part have been proposed. According to this prior art, in the expansion / contraction part for fitting, the part where the joint part is aligned in the vertical direction becomes a continuous groove in the vertical direction, and the part between the grooves bulges to the same extent on both sides Thus, the air permeability is improved by the groove, and the cushioning property (compression restoring property) is excellent due to the large bulge, and the elongated elastic elastic member is hard to hit the skin.

  However, this prior art has a problem in that the portion between the grooves in the fitting stretchable part bulges to the same degree on both the front and back sides, and the thickness of the fitting stretchable part increases excessively. This problem is not preferable when an outer such as clothing is used together like a disposable diaper or a sanitary napkin because the outer is hard to wear.

  As what solves this problem, the thing of patent document 4 is proposed, but although this prior example is difficult to attach the clamp | tightening trace of an elongate elastic expansion-contraction member compared with a general thing, patent document Compared with the ones described in 1 to 3, the tightening traces were somewhat easily attached.

JP 2008-295930 A JP 2009-297096 A JP 2009-148447 A JP 2012-095936 A

  Then, the main subject of this invention is providing the absorbent article provided with the expansion-contraction part for fitting which is hard to be attached | subjected of the clamp | tightening trace of an elongate elastic expansion-contraction member, and is thin and has a clean appearance.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A first sheet base material having a surface in contact with the skin of the wearer; a second sheet base material bonded to a surface opposite to the surface in contact with the wearer's skin in the first sheet base material; and these sheets In an absorbent article comprising a stretchable part for fitting having an elongated elastic stretchable member provided between substrates,
The first sheet base material is formed into a shape having a large number of irregularities, at least in a state where the expansion / contraction part for the fit is developed,
The second sheet base material is configured to be flat in a state in which at least the fitting stretchable part is developed,
Of the irregularities in the first sheet base material, the one that bulges to the second sheet base material side is joined to the opposing part of the second sheet base material, and the first sheet base material is the first except for this joint part. It is a non-joining part that can swell away from the second sheet base material without being joined to the two sheet base material,
The elongated elastic elastic member is disposed so as to pass through a non-joined portion of the first sheet base, and is fixed to the second sheet base in a state of being elongated in the longitudinal direction, and the first sheet Not fixed to the base material,
An absorbent article characterized by the above.

(Function and effect)
In the stretchable part for fitting of such a structure, on the basis of the pasted state in which the uneven portion of the first sheet base material constituting the surface in contact with the skin of the wearer is excessive with respect to the second sheet base material, Only the second sheet base material receives the contraction force of the elongated elastic elastic member directly and contracts, and the first sheet base material contracts as the second sheet base material contracts. As a result, the first sheet base material and the second sheet base material are wrinkled, but the second sheet base wrinkle is only a shrinkage wrinkle by the elongated elastic elastic member, whereas the first sheet base material The salmon swells greatly by the surplus. In other words, the expansion / contraction part for the fit is formed with a bulging part larger than the contraction wrinkle by the elongated elastic expansion / contraction member on the skin side of the wearer with respect to the elongated elastic expansion / contraction member, and the elongated elastic expansion / contraction part on the opposite side. It becomes a front and back non-target structure where only shrinkage wrinkles due to members enter. Moreover, since the elongated elastic elastic member passes through the non-joined portion between the second sheet base material and the first sheet base material, the elongated elastic elastic member is larger than the first sheet base material when viewed from the skin side. Hidden in the bulge of the eagle.

  Therefore, the skin side surface is excellent in cushioning properties, and it is difficult for the elongated elastic elastic member to be clamped, and the opposite surface has a relatively fine wrinkle, a thin and clean appearance. Therefore, even when an outer such as clothing is used together like a disposable diaper or a sanitary napkin, there is an advantage that it is difficult to wear the outer.

<Invention of Claim 2>
In the first sheet base material, at least the fitting elastic part is deployed, the top and bottom extending in a direction parallel to the elongated elastic elastic member are in a direction perpendicular to the elongated elastic elastic member. It is formed in a wavy shape that is alternately located at intervals,
Of the top and bottom portions of the first sheet base material, the one that bulges toward the second sheet base material is joined to the opposing portion of the second sheet base material, and the space between the joint portions is the first sheet base. The material is not joined to the second sheet base material and is a non-joined part that can swell away from the second sheet base material,
The elongated elastic elastic member is disposed in a cylindrical part formed by a non-joining part of the first sheet base and the second sheet base.
The absorbent article according to claim 1.

(Function and effect)
In this form, the non-joining part of the first sheet base material contracts in a zigzag shape in the longitudinal direction of the cylindrical part among the cylindrical parts formed by the non-joining parts of the first sheet base material and the second sheet base material. As a result, a wrinkle that swells greatly on the side of the skin is formed, and the elongated elastic stretchable member is hidden on the second sheet substrate side (the side far from the skin) in the cylindrical portion. Therefore, wrinkles on the skin side surface are regularly formed and the shape is easily maintained. In addition, the contact surface to the skin is continuous in the longitudinal direction of the cylindrical part, but since the groove is formed between the cylindrical parts and becomes discontinuous, the contact area to the skin is reduced and the air permeability is also good. It becomes.

<Invention of Claim 3>
In the first sheet base material, at least in the state where the stretchable part for fitting is deployed, a bulging part bulging in an umbrella shape on the opposite side to the second sheet base material side is parallel to the elongated elastic elastic member. A plurality of bulging portion rows arranged along a certain direction are formed at intervals in a direction orthogonal to the elongated elastic elastic member,
The part between the bulging part rows in the first sheet base material is joined to the opposing part in the second sheet base material, and the part of the bulging part row in the first sheet base material is the second sheet base material. It is a non-joining part that can be separated from the second sheet base material without being joined and bulge,
The elongated elastic elastic member is disposed between the first sheet base material and the second sheet base material in the non-joining portion,
The absorbent article according to claim 1.

(Function and effect)
In this form, the bulging portion row of the first sheet base material contracts in the direction of the row to form a fold that the bulging portion bulges greatly on the skin side surface, and the second sheet base material side ( The elongated elastic elastic member is hidden on the side far from the skin. Therefore, wrinkles on the skin side are regularly formed. Moreover, since a groove | channel is formed around each bulging part in the contact surface with respect to skin, the contact area with respect to skin falls and air permeability becomes favorable.

<Invention of Claim 4>
The joint part of a said 1st sheet base material and a said 2nd sheet base material is any one of Claims 1-3 currently formed intermittently in the longitudinal direction of the said elongate elastic elastic member. Absorbent article.

(Function and effect)
By adopting such intermittent joining, the fitting stretchable part is more flexible and more breathable.

<Invention of Claim 5>
An exterior sheet constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, including both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined together, the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed, a pants-type disposable diaper,
In the region including at least both sides in the width direction of the interior body in the exterior sheet, the stretchable part for fitting is provided so that the elongated elastic stretchable member is in the width direction.
The absorbent article of any one of Claims 1-4.

(Function and effect)
The stretchable part for fitting according to the present invention is thus suitable for regions located at least on both sides in the width direction of the interior body in the exterior sheet of the pants-type disposable diaper.

<Invention of Claim 6>
A first sheet base material having a surface in contact with the skin of the wearer; a second sheet base material bonded to a surface opposite to the surface in contact with the wearer's skin in the first sheet base material; and these sheets A method for forming a stretchable part for fitting having an elongated elastic stretchable member provided between substrates,
An embossing step of forming a large number of irregularities on the first sheet base material by embossing;
An elastic member fixing step of fixing the elongated elastic stretchable member in the longitudinal direction to the second sheet substrate;
A method of bonding the first sheet base material in the unfolded state where the unevenness remains and the second sheet base material in the unfolded state to bulge out of the unevenness in the first sheet base material toward the second sheet base material. Are joined to the opposite portion of the second sheet base material where the elongated elastic elastic member is not disposed, and the second sheet base material is joined to the second sheet base material without joining the second sheet base material except for the joint portion. A non-bonding portion that can be swelled away from the sheet base material, and a bonding step;
A method for forming a stretchable part for fitting, comprising:

(Function and effect)
By such a manufacturing method, the expansion / contraction part for fitting which has many advantages mentioned above can be formed continuously.

<Invention of Claim 7>
Using a first roll, a second roll combined with the first roll and having an uneven pattern on the outer peripheral surface, and a third roll combined with the second roll,
After the first sheet base material is passed between the first roll and the second roll and pressed against the uneven pattern on the outer peripheral surface of the second roll,
While maintaining the pressing state of the outer peripheral surface of the second roll against the concavo-convex pattern, the second roll is guided between the second roll and the third roll, and the second sheet base to which the elongated elastic member is fixed is the second roll. And between the third roll,
By joining the first sheet base material and the second sheet base material at a portion sandwiched between the convex pattern on the outer peripheral surface of the second roll and the outer peripheral surface of the third roll, Forming a joint,
The formation method of the expansion-contraction part for fitting of Claim 6.

(Function and effect)
By such a combination of three rolls, the position of the joining portion of the first sheet base material and the second sheet base material is not shifted in principle with respect to the position of the unevenness of the first sheet base material. Defects such as crushing, uneven size being small or large, or irregular wrinkles due to these are not generated. Therefore, it is possible to continuously form a high-speed and high-quality fitting stretchable part.

<Invention of Claim 8>
The first sheet base material is a nonwoven fabric,
The embossing of the first sheet base material between the first roll and the second roll does not have fiber welding for maintaining the uneven shape of the emboss, and the softened emboss is reduced in bending resistance as the unevenness is formed. Processing,
The fitting part according to claim 7, wherein the formation of the joint portion between the second roll and the third roll is performed by welding of the first sheet base material and the second sheet base material, or adhesion by a hot melt adhesive. Method for forming the stretchable part.

(Function and effect)
When softening embossing is applied to the nonwoven fabric, irregularities are formed without fiber welding, and the bending resistance of the nonwoven fabric itself is probably due to fiber breakage due to the formation of irregularities and the change in the fiber structure due to stretching and shrinkage of the nonwoven fabric itself. In addition to the reduction, the softness of the skin is remarkably improved by the reduction of the skin contact area and the improvement of the compression recovery property due to the formation of irregularities. Therefore, by adopting such a material and processing for the first sheet base material, the wrinkles of the first sheet base material that bulges greatly on the skin side surface of the fitting stretchable part become flexible, and as a result, the touch improves. In addition, the wrinkles of the first sheet base material are appropriately crushed and an excessive increase in thickness can be avoided.
Here, the term "softening embossing" means that there is no fiber welding to maintain the uneven shape of the emboss, and the softness (JIS L 1913: 2010 "41.5 ° cantilever method") Means embossing. Therefore, softening embossing does not exclude heating during embossing, but even if heated, it must be below the melting point of the fiber, and the uneven shape can be maintained by fiber welding like heat embossing. Does not include (hardened emboss). The term “embossing” does not include drilling.

  As described above, according to the present invention, there are the advantages that the elongated elastic elastic member is less likely to be clamped, and that the fitting elastic part is thin and has a clean appearance.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is (a) perspective view and (b) sectional drawing which show the 1st form of an expansion-contraction part. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is the top view and front view which show the manufacture point of the expansion-contraction part for a fit. It is (a) perspective view and (b) sectional drawing which show the 1st form of an expansion-contraction part. It is (a) perspective view and (b) sectional drawing which show the 2nd form of an expansion-contraction part. It is (a) perspective view and (b) sectional drawing which show the other form of an expansion-contraction part. It is a photograph of the inner side sheet base material side (skin side) surface of the sample of an expansion-contraction part. It is a photograph of the outer side sheet base material side (diaper outer surface side) side of a sample of an expansion-contraction part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. Symbol Y indicates the total length of the diaper, and symbol X indicates the total width of the diaper.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch portion so that both sides of the front body and the back body side of the diaper 100 are overlapped, in other words, For example, it means a direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows barrier cuffs 60 that stand on the body side and are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When the barrier cuff 60 is provided, both sides of the top sheet 30 pass between the liquid-impervious back sheet 11 and the barrier cuff 60 to the back side of the absorbent element 50 to prevent the penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the barrier cuff 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.

  The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Barrier cuffs)
The barrier cuff 60 is a belt-like member that extends over the entire front and rear direction along both side portions of the interior body 200, blocks urine and soft stool that move laterally along the top sheet 30, and prevents side leakage. It is provided for this purpose. The barrier cuff 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion stands up obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the barrier cuff 60 is formed by folding a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folding it in the width direction. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end of the barrier cuff 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The barrier sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric having excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the figure, a waterproof film 64 can be interposed between the barrier sheets folded in two.

  The number of the elongated elastic stretch members 63 provided in the free part of the barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the barrier cuff 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, the absorbent element 50 in the interior body 200.

  In the barrier cuff 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts to bring the both ends in the front-rear direction close to each other, but the both ends of the projecting portion 66 are fixed so that they do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is located on the back surface side of the interior body 200, the barrier cuff 60 stands up so that the barrier cuff 60 opens outward in the width direction at and around the crotch portion. It comes in contact, and the fit is improved.

  The dimensions of the barrier cuff 60 can be appropriately determined. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the barrier cuff 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, when the barrier cuff 60 is flatly folded so that the barrier cuff 60 is parallel to the surface of the top sheet 30, the distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Unlike the illustrated embodiment, double (two rows) of barrier cuffs can be provided on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the barrier cuff 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of the portion forming the leg opening LO (the side seal portion 12A of the front body F). And an intermediate portion L defined as a front-rear direction region having a side seal portion 12A of the back body B. The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H by heat or ultrasonic welding, or a bonding means such as a hot melt adhesive. Yes, the inner sheet base 12H located inside extends only to the edge of the waist opening WO, but the outer sheet base 12S wraps around the waist side edge of the inner sheet base 12H and enters the inside The folded portion 12r extends so as to cover the upper end of the interior body 200.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber at a predetermined elongation rate between the sheet bases 12S and 12H in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. The elongate elastic members 15 to 19 are not particularly limited, but hot melt bonding by various application methods can be suitably used. If both sheet base materials 12S and 12H are bonded to the entire surface of the exterior sheet 12, the sheet becomes hard, which is not preferable. Therefore, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded and the other portions are not bonded or are bonded weakly.

More specifically, the entire width direction is continuous between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist edge W of the rear body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet base 12H and the inner side surface of the outer sheet base 12S in the lower waist U of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined interval in the vertical direction It is fixed in an expanded state along the width direction at an expansion rate.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A plurality of intermediate elastic expansion / contraction members 16 made of an elongated elastic expansion / contraction member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction.

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, when the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 are respectively provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the arrangement of the waist lower elastic members 15, 19, 16, and 18 is not limited to the above example, and the waist lower portion so that the elastic force acts on the entire width of the waist lower U. A part or all of the elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side in the width direction to the other side.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.

  At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

  Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
Between the liquid-impermeable back sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. The exterior sheet 12 may be omitted, and the print sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.

  Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.

As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable back sheet in the interior body, so as to cover the entire back surface of the interior body, or so as to cover the entire portion exposed between the abdominal exterior sheet and the back exterior sheet, The crotch outer sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet of the present invention.

(About features)
In the pants-type disposable diaper as described above, the structure of the stretchable part for fitting of the present invention can be applied to the lower waist part U and the intermediate part L. That is, the portion includes an inner sheet base 12H having a surface that comes into contact with the wearer's skin, and an outer sheet base that is bonded to a surface opposite to the face in contact with the wearer's skin in the inner sheet base 12H. It has a material 12S (second sheet base material), waist lower elastic elastic members 15 and 19 and intermediate elastic elastic members 16 and 18 provided between these sheet base materials, and the inner sheet base material 12H is the main sheet base material 12H. The outer sheet base material corresponds to the first sheet base material of the invention, the outer sheet base material corresponds to the second sheet base material of the present invention, and the lower waist elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are the first in the present invention. It corresponds to an elongated elastic elastic member sandwiched between the one sheet base material and the second sheet base material. The first sheet base material and the second sheet base material are each composed of a single base material, and either one or both are laminates formed by laminating a plurality of base materials such as nonwoven fabrics. Also good.

  Hereinafter, application examples illustrated in FIGS. 6, 10, and 11 will be described in order. FIG. 6 is an enlarged view of a state in which the waist lower portion U and the intermediate portion L of the first embodiment are expanded, and the inner sheet base 12H has a width direction (waist lower elastic elastic members 15, 19 and intermediate portions). The top portion 12t and the bottom portion 12b extending in the direction parallel to the partial elastic members 16 and 18 are spaced apart in the vertical direction (the direction perpendicular to the waist lower elastic members 15 and 19 and the intermediate elastic members 16 and 18). The outer sheet | seat base material 12S is made into the wavy shape which is located alternately and is flat. Of the top portion 12t and the bottom portion 12b of the inner sheet base material 12H, the one that swells to the outer sheet base material 12S side (the bottom portion 12b in the illustrated example) is joined to the facing portion of the outer sheet base material 12S, and this joining Between the portions 12c, the inner sheet base 12H is not joined to the outer sheet base 12S and is formed as a non-joint portion 12n that can swell away from the outer sheet base 12S.

  Further, the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are arranged so as to pass through the cylindrical part formed by the non-joining part 12c of the inner sheet base 12H and the outer sheet base 12S. At the same time, it is fixed to the outer sheet base 12S while being stretched in the longitudinal direction, and is not fixed to the inner sheet base 12H. As long as the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 pass through the cylindrical part formed by the non-joining part 12c of the inner sheet base 12H and the outer sheet base 12S, The position is not particularly limited and may be adjacent to one of the joint portions 12c, but an arrangement passing through an intermediate portion between both the joint portions 12c, particularly the central portion, is preferable.

  The fixing means for the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 can be determined as appropriate, but is preferably fixed by a hot melt adhesive 12m. The hot melt adhesive 12m is applied to the outer peripheral surfaces of the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 to adhere to the outer sheet base material 12S. A hot melt adhesive is applied to the inner surface of 12S in a continuous pattern such as a bead or a solid, and the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are attached to the outer sheet base 12S by this hot melt adhesive. It is possible to adopt a method of fixing to

  Further, the joining portion 12c of the inner sheet base 12H and the outer sheet base 12S is formed by welding with heat or ultrasonic waves as shown in FIG. 6, or is formed with a hot melt adhesive 12m as shown in FIG. Can be. Further, the joint portion 12c of the inner sheet base 12H and the outer sheet base 12S can be formed continuously as shown in FIG. 10, but as shown in the illustrated embodiment, the waist lower elastic elastic members 15, 19 and It is preferable that the intermediate elastic elastic members 16 and 18 are formed intermittently (in a dotted line shape) in the longitudinal direction because the fitting elastic parts are more flexible and more breathable. Furthermore, in this case, the position in the width direction of the joint portion 12c can be shifted between the joint portions 12c adjacent in the vertical direction. For example, as shown in FIG. The size of the joint 12c can be determined as appropriate, but in normal cases, the length in the longitudinal direction of the waist lower elastic members 15 and 19 and the intermediate elastic members 16 and 18 is preferably about 2 to 10 mm. The length in the direction orthogonal to this is preferably about 1 to 3 mm.

  On the other hand, the interval WL (wavelength; the interval between the top portions 12t) of the wave bottom portion 12b of the inner sheet substrate 12H can be determined as appropriate, but is preferably about 4 to 10 mm, and the inner sheet substrate 12H. The bulging height AM (amplitude) of the wave can be determined as appropriate, but is preferably about 2 to 5 mm.

  In the fitting stretchable part having such a structure, the non-joint part 12c of the inner sheet base material 12H constituting the surface in contact with the wearer's skin is the outer side, as can be seen from the fully extended state of FIG. The sheet base 12S is surplus, and this surplus portion (the portion between the bottom portions 12b12t) is formed so as to step in a direction perpendicular to the waist lower elastic members 15 and 19 and the intermediate elastic members 16 and 18. The Only the outer sheet base 12S contracts by directly receiving the contraction force of the waist lower elastic members 15, 19 and the intermediate elastic members 16, 18, and the inner sheet base 12H contracts the outer sheet base 12S. Shrink with it. As a result, both the inner sheet base 12H and the outer sheet base 12S are wrinkled, but as can be seen from the intermediate extension state of FIG. 14 (b) and the natural length state of FIG. 14 (c), the outer sheet base 12S. The wrinkles are only contracted wrinkles 12r by the waist lower elastic elastic members 15, 19 and the intermediate elastic elastic members 16, 18, whereas the intermediate length of FIG. 13B and the natural length of FIG. As can be seen from the state, the wrinkles of the inner sheet base material 12H bulge out by a surplus. In other words, the fit elastic part is located on the skin side of the wearer with respect to the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18, and the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic member 16. , 18 is formed as a bulging portion 12x larger than the shrinkage folds 18 and on the opposite side thereof, only the shrinkage folds 12r due to the waist lower elastic expansion members 15, 19 and the intermediate elastic expansion members 16, 18 are included. Become. In addition, the lower waist elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 pass through the non-joining portion 12c between the outer sheet base 12S and the inner sheet base 12H, and FIG. As can be seen from the intermediate extended state of FIG. 13 and the natural length state of FIG. 13C, the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are larger than the inner sheet base 12H when viewed from the skin side. Hidden in the bulge of the spear 12x. Therefore, the skin side surface has excellent cushioning properties, the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are hardly attached, and the opposite surface is relatively fine, thin, and clean. Will come to present. Therefore, even when an outer such as clothing is used in combination, there is an advantage that it is difficult to wear the outer.

  In particular, in the illustrated form, as can be seen from FIG. 13, the non-joining portion 12 c of the inner sheet base 12 </ b> H among the cylindrical portions formed by the non-joining portions 12 c of the inner sheet base 12 </ b> H and the outer sheet base 12 </ b> S is provided. While forming a ridge 12x that contracts in a zigzag shape in the longitudinal direction of the cylindrical portion and bulges greatly on the side of the skin, the waist lower elastic elastic member 15 is formed on the outer sheet base 12S side (the side far from the skin) in the cylindrical portion. , 19 and the intermediate elastic elastic members 16, 18 are hidden. Therefore, the skin side wrinkles 12x are regularly formed and the shape is easily maintained. In addition, the contact surface to the skin is continuous in the longitudinal direction of the cylindrical part, but since the groove is formed between the cylindrical parts and becomes discontinuous, the contact area to the skin is reduced and the air permeability is also good. It becomes.

  Next, FIG. 11 is an enlarged view of a state where the waist lower portion U and the intermediate portion L of the second embodiment are expanded. The inner sheet base 12H has an opposite side to the outer sheet base 12S side. Bulging portion rows 12w, 12w formed by juxtaposing the bulging portion 12w in an umbrella shape along the direction parallel to the lower waist elastic elastic members 15, 19 and the intermediate elastic elastic members 16, 18 Are formed at intervals in a direction orthogonal to the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18, and the outer sheet base 12S is flat. And the part between the bulging part row | line | columns 12w, 12w ... in the inner side sheet base material 12H is joined to the opposing site | part in the outer side sheet | seat base material 12S, and the part of the bulging part row | line | column 12w, 12w ... in the inner side sheet | seat base material 12H. Is not joined to the outer sheet base material 12S, and is formed as a non-joined portion 12c that can swell away from the outer sheet base material 12S.

  Further, the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are located between the inner sheet base 12H and the outer sheet base 12S in the non-joining portion 12c (the bulging portion rows 12w, 12w...). And is fixed to the outer sheet base 12S in a state of being elongated in the longitudinal direction.

  The fixing means for the waist lower elastic elastic members 15, 19 and the intermediate elastic elastic members 16, 18, and the bonding means for the inner sheet base 12H and the outer sheet base 12S are the same as in the first embodiment.

  In such a structure, in the normal case, the longitudinal length YL of the bulging portion 12w of the inner sheet base 12H is preferably about 4 to 10 mm, and the interval YD between the bulging portion rows 12w, 12w. It is preferable that the height is about 3 mm, and the bulging height WH of the bulging portion 12w is desirably about 2-6 mm.

  As can be easily imagined from the first form, the expansion / contraction part of the second form is such that the bulging part row of the inner sheet base material 12H contracts in the direction of the row so that the bulging part 12w is on the skin side surface. A large bulge is formed and the lower waist elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 are hidden on the outer sheet base 12S side (the side far from the skin) in the bulging part 12w. Become. Therefore, the same advantage as the first embodiment is brought about. Moreover, in the 2nd form, the wrinkle of the skin side surface is formed more regularly. Furthermore, in the second embodiment, since a groove is formed around each bulging portion 12w on the contact surface with the skin, the contact area with the skin is further reduced, and air permeability is improved.

(Example of forming stretchable part for fit)
As a method of forming the above-mentioned fit stretchable part,
(A) an embossing step of forming a large number of irregularities on the inner sheet base 12H by embossing;
(B) an elastic member fixing step of fixing the elongated elastic elastic members 15, 16, 18, 19 to the outer sheet base material 12 </ b> S in a state of being elongated in the longitudinal direction;
(C) The inner sheet base material 12H and the outer sheet base material 12S are bonded together in the unfolded state, and the outer sheet base material 12S is the one that bulges to the outer sheet base material 12S side among the irregularities in the inner sheet base material 12H. The elongated elastic elastic members 15, 16, 18, and 19 are joined to opposing portions, and the inner side sheet base 12 </ b> H is not joined to the outer side sheet base 12 </ b> S except for the joined portion. A bonding step, which is a non-joining portion that can swell away from 12S,
We propose a method that includes By such a manufacturing method, the expansion / contraction part for fitting which has many advantages mentioned above can be formed continuously.

  FIG. 9 shows one preferred manufacturing technique. In this example, a first roll 86, a second roll 85 having a concavo-convex pattern on the outer peripheral surface combined with the first roll 86, and a third roll 87 combined with the second roll are used. After the sheet substrate 12H is passed between the first roll 86 and the second roll 85 and pressed against the concavo-convex pattern on the outer circumferential surface of the second roll 85, a large number of irregularities are formed, and then the outer circumferential surface of the second roll 85 It guide | induces between the 2nd roll 85 and the 3rd roll 87, maintaining the pressing state to an uneven | corrugated pattern. On the other hand, the outer sheet base 12 </ b> S is separately introduced between the second roll 85 and the third roll 87. Prior to introduction between the second roll 85 and the third roll 87, an elongated shape in which a hot melt adhesive is applied to the peripheral surface by a hot melt adhesive applicator 88 on the bonding surface of the outer sheet base material 12 </ b> S. Elastic members 15, 16, 18, 19 are supplied and fixed in an extended state. Although not shown in the figure, the hot elastic adhesive members 15 and 19 and the intermediate elastic elastic members 16 and 18 are not applied with hot melt adhesive, and the elastic elastic member fixing position on the bonding surface of the outer sheet base 12S is hot. It is also possible to apply the melt adhesive in a continuous pattern such as a bead or a solid and introduce and affix the waist lower elastic members 15 and 19 and the intermediate elastic members 16 and 18 to the application position. And between the 2nd roll 85 and the 3rd roll 87, the inner surface base material 12H and the outer side sheet base material 12S are outer peripheral surfaces of the 2nd roll 85 in the site | parts without the elongate elastic members 15,16,18,19. The joint 12c and the non-joint part 12c are formed by sandwiching and joining between the convex pattern and the outer peripheral surface of the third roll 87.

  By such a combination of the three rolls 85 to 87, the positions of the joint portions 12c of the inner sheet base material 12H and the outer sheet base material 12S are not displaced in principle with respect to the concave and convex positions of the inner sheet base material 12H. However, there is no occurrence of defects such as crushing by the joint portion 12c, small or large irregularities, or irregularities in wrinkles. Therefore, it is possible to continuously form a high-speed and high-quality fitting stretchable part.

  The presence or absence of unevenness on the outer peripheral surface of the first roll 86 and the uneven pattern of the second roll 85 can be appropriately determined according to the form of the unevenness formed on the inner sheet base 12H, but are formed on the inner sheet base 12H. In order to form the unevenness to be deep and deep, double-sided embossing where the unevenness pattern of the first roll 86 and the unevenness pattern of the second roll 85 are engaged (a steel match embossing that is a steel roll corresponds to this, one roll It is preferable to employ a material made of a material other than steel.

  For example, in order to form the inner sheet base material 12H in a corrugated shape as in the first embodiment (a corrugated cross-section such as a corrugated plate and the undulation appears as irregularities 90 on the front and back surfaces), FIG. As shown, the first roll 86 is a female embossing roll in which a plurality of groove-like concave portions 86d extending around the entire circumference into which the convex stripes 85p of the second roll 85 enter are formed at predetermined intervals in the axial direction. Double-sided embossing can be performed using a male embossing roll 85 in which a large number of streak-shaped convex portions 85p extending around the entire circumference are formed at predetermined intervals in the axial direction. To form the umbrella-shaped bulging portion 12w on the inner sheet base 12H as in the second embodiment, although not shown, either the first roll 86 or the second roll 85 is replaced with the umbrella-shaped bulging portion. A convex portion having a shape corresponding to the recess on the back surface of 12w is a male embossing roll formed on the outer peripheral surface with a large number of intervals, and the concave portion into which each convex portion of the male embossing roll enters is formed on the outer peripheral surface. What is necessary is just to perform a double-sided embossing as a female embossing roll.

  In the former case, the joint 12c can be formed between the second roll 85 and the third roll 87 by welding the inner sheet base 12H and the outer sheet base 12S, or by bonding with the hot melt adhesive 12m. Can form the joint 12c by maintaining the temperature of the third roll 87 at a temperature at which the inner sheet base 12H and the outer sheet base 12S are welded. In the latter case, the outer sheet base 12S is formed in advance. The bonding portion 12c can be formed by applying the hot melt adhesive 12m to the bonding surface. The presence or absence of irregularities on the outer peripheral surface of the third roll 87 can be determined as appropriate. In addition to the form having no irregularities as shown in the figure, the same pattern as the irregularities of the second roll 85 is used. It is also possible to perform the joining by sandwiching between the tip of the part and the tip of the convex part of the third roll 87.

  In particular, when the inner sheet base 12H is a nonwoven fabric, there is no fiber welding for maintaining the uneven shape of the emboss as the embossing of the inner sheet base 12H between the first roll 86 and the second roll 85. In addition, it is preferable to employ softening embossing in which the bending resistance decreases with the formation of irregularities. When softening embossing is applied to the nonwoven fabric, irregularities are formed without fiber welding, and the bending resistance of the nonwoven fabric itself is probably due to fiber breakage due to the formation of irregularities and the change in the fiber structure due to stretching and shrinkage of the nonwoven fabric itself. In addition to the reduction, the softness of the skin is remarkably improved by the reduction of the skin contact area and the improvement of the compression recovery property due to the formation of irregularities. Therefore, by adopting such a material and processing for the inner sheet base material 12H, the wrinkles of the inner sheet base material 12H that bulges greatly on the skin side surface of the fitting stretchable part become flexible, and as a result, the touch is improved. In addition, the wrinkles of the inner sheet base material 12H are appropriately crushed and an excessive increase in thickness can be avoided.

  Softening embossing has no fiber fusion to maintain the uneven shape of the emboss, and the softness (meaning according to the “41.5 ° cantilever method” of JIS L 1913: 2010) decreases with the formation of the unevenness. Embossing, and the bending resistance after processing is preferably about 15 to 40 mm, more preferably 20 to 35 mm. Softening embossing can be heated at the time of embossing, but even if heated, it must be below the melting point of the fiber. Specifically, in the case of a non-woven fabric of olefin fiber, the heating temperature (roll temperature) can be 0 to 100 degrees.

(Other)
The above example is an example of application to the part from the waist lower part U to the middle part L of the pants-type disposable diaper, but it may be applied including the waist edge W, and the elastic elastic member 16 of the middle part L , 18 may be omitted. Moreover, the structure of the above-mentioned expansion-contraction part for a fit is applicable also to other expansion-contraction parts, such as the waist part of the back side part of a tape-type disposable diaper described in the term of the prior art, and a three-dimensional gather.

  In addition, as shown in FIG. 12, by providing a plurality of concave and convex portions on the inner sheet base material 12H with an interval in the vertical direction, a plurality of fitting stretchable parts 100 according to the present invention are provided with an interval in the vertical direction. Can be provided. In this case, by providing the elongated elastic elastic members 15, 16, 18, 19 in addition to the concave / convex forming portions in the inner sheet base material 12 </ b> H, the conventional general expansion / contraction part 110 is provided or disposed adjacently. Can do. Although not shown in the drawing, similarly, by providing a plurality of concave and convex portions on the inner sheet substrate with a gap in the width direction, a plurality of fitting stretchable parts according to the present invention can be provided with a gap in the width direction. In that case, by providing an elongated elastic elastic member in addition to the irregularity forming portion in the inner sheet base material, a conventional general expansion / contraction part can be provided intervening or adjacent thereto.

  Further, the unevenness of the inner sheet base 12H can be formed in a shape and arrangement different from the above example, and can be formed in an irregular arrangement in addition to the regular arrangement as in the above example.

(Experimental example)
13 and 14 show a sample of the first embodiment of the stretchable part. FIG. 13 is a skin contact surface, FIG. 14 is the opposite surface, (a) in each figure is in a fully extended state (the same state as in FIG. 6), (c) in each figure is in a natural length state, (B) is an intermediate extension state between a natural length state and a complete extension state.

As the inner sheet base 12H and the outer sheet base 12S of each sample, PP fiber spunbond nonwoven fabric (weight per unit area: 18 g / m ² ) is used, and the elastic elastic member 15 is a synthetic thread rubber having a thickness of 470 dtex. used. The elongated elastic elastic member 15 is fixed to the outer sheet base material in a state where the elongated elastic elastic member 15 having a hot melt adhesive applied to the outer peripheral surface at a rate of 0.039 g / m is extended at an elongation rate of 200%. The joint portion 12c of the inner sheet base material 12H and the outer sheet base material 12S follows the form shown in FIG. 10, and the hot melt adhesive 12m has a width of 2 mm and a coating amount of 45 g / m ^2. It was performed by coating with. Further, the interval between the elongated elastic elastic members 15 is 10 mm, the interval WL between the wave bottoms 12b of the inner sheet base 12H (wavelength; the same applies to the interval between the tops 12t) is 5 mm, and the wave bulge height of the inner sheet base 12H. The AM (amplitude) was 3 mm.

  As a result, among the cylindrical parts formed by the non-joining parts 12c of the inner sheet base 12H and the outer sheet base 12S, in the skin contact surface, as shown in FIGS. 13 (b) and (c), The non-joined portion 12c of the inner sheet base material 12H contracted in a zigzag shape in the longitudinal direction of the cylindrical portion to form a ridge 12x that bulges greatly on the skin side surface. On the other hand, on the surface opposite to the skin contact surface, as shown in FIGS. 14 (b) and 14 (c), although the contracted ridge 12r by the elongated elastic expansion / contraction member 15 enters, the bulge beyond the ridge 12r is not seen. I couldn't.

  The present invention can be used for absorbent articles.

  DESCRIPTION OF SYMBOLS 11 ... Impervious back sheet, 12 ... Exterior sheet, 12H ... Inner sheet base material, 12S ... Outer sheet base material, 12t ... Top part, 12b ... Bottom part, 12m ... Hot melt adhesive, 12w ... Swelling part, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet , 12c ... joining part, 12n ..., 86 ... 1st roll, 85 ... 2nd roll, 87 ... 3rd roll.

Claims (8)

A first sheet base material having a surface in contact with the skin of the wearer; a second sheet base material bonded to a surface opposite to the surface in contact with the wearer's skin in the first sheet base material; and these sheets In an absorbent article comprising a stretchable part for fitting having an elongated elastic stretchable member provided between substrates,
The first sheet base material is formed into a shape having a large number of irregularities, at least in a state where the expansion / contraction part for the fit is developed,
The second sheet base material is configured to be flat in a state in which at least the fitting stretchable part is developed,
Of the irregularities in the first sheet base material, the one that bulges to the second sheet base material side is joined to the opposing part of the second sheet base material, and the first sheet base material is the first except for this joint part. It is a non-joining part that can swell away from the second sheet base material without being joined to the two sheet base material,
The elongated elastic elastic member is disposed so as to pass through a non-joined portion of the first sheet base, and is fixed to the second sheet base in a state of being elongated in the longitudinal direction, and the first sheet Not fixed to the base material,
An absorbent article characterized by the above. In the first sheet base material, at least the fitting elastic part is deployed, the top and bottom extending in a direction parallel to the elongated elastic elastic member are in a direction perpendicular to the elongated elastic elastic member. It is formed in a wavy shape that is alternately located at intervals,
Of the top and bottom portions of the first sheet base material, the one that bulges toward the second sheet base material is joined to the opposing portion of the second sheet base material, and the space between the joint portions is the first sheet base. The material is not joined to the second sheet base material and is a non-joined part that can swell away from the second sheet base material,
The elongated elastic elastic member is disposed in a cylindrical part formed by a non-joining part of the first sheet base and the second sheet base.
The absorbent article according to claim 1. In the first sheet base material, at least in the state where the stretchable part for fitting is deployed, a bulging part bulging in an umbrella shape on the opposite side to the second sheet base material side is parallel to the elongated elastic elastic member. A plurality of bulging portion rows arranged along a certain direction are formed at intervals in a direction orthogonal to the elongated elastic elastic member,
The part between the bulging part rows in the first sheet base material is joined to the opposing part in the second sheet base material, and the part of the bulging part row in the first sheet base material is the second sheet base material. It is a non-joining part that can be separated from the second sheet base material without being joined and bulge,
The elongated elastic elastic member is disposed between the first sheet base material and the second sheet base material in the non-joining portion,
The absorbent article according to claim 1.   The joint part of a said 1st sheet base material and a said 2nd sheet base material is any one of Claims 1-3 currently formed intermittently in the longitudinal direction of the said elongate elastic elastic member. Absorbent article. An exterior sheet constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, including both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined together, the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed, a pants-type disposable diaper,
In the region including at least both sides in the width direction of the interior body in the exterior sheet, the stretchable part for fitting is provided so that the elongated elastic stretchable member is in the width direction.
The absorbent article of any one of Claims 1-4. A first sheet base material having a surface in contact with the skin of the wearer; a second sheet base material bonded to a surface opposite to the surface in contact with the wearer's skin in the first sheet base material; and these sheets A method for forming a stretchable part for fitting having an elongated elastic stretchable member provided between substrates,
An embossing step of forming a large number of irregularities on the first sheet base material by embossing;
An elastic member fixing step of fixing the elongated elastic stretchable member in the longitudinal direction to the second sheet substrate;
A method of bonding the first sheet base material in the unfolded state where the unevenness remains and the second sheet base material in the unfolded state to bulge out of the unevenness in the first sheet base material toward the second sheet base material. Are joined to the opposite portion of the second sheet base material where the elongated elastic elastic member is not disposed, and the second sheet base material is joined to the second sheet base material without joining the second sheet base material except for the joint portion. A non-bonding portion that can be swelled away from the sheet base material, and a bonding step;
A method for forming a stretchable part for fitting, comprising: Using a first roll, a second roll combined with the first roll and having an uneven pattern on the outer peripheral surface, and a third roll combined with the second roll,
After the first sheet base material is passed between the first roll and the second roll and pressed against the uneven pattern on the outer peripheral surface of the second roll,
While maintaining the pressing state of the outer peripheral surface of the second roll against the concavo-convex pattern, the second roll is guided between the second roll and the third roll, and the second sheet base to which the elongated elastic member is fixed is the second roll. And between the third roll,
By joining the first sheet base material and the second sheet base material at a portion sandwiched between the convex pattern on the outer peripheral surface of the second roll and the outer peripheral surface of the third roll, Forming a joint,
The formation method of the expansion-contraction part for fitting of Claim 6. The first sheet base material is a nonwoven fabric,
The embossing of the first sheet base material between the first roll and the second roll does not have fiber welding for maintaining the uneven shape of the emboss, and the softened emboss is reduced in bending resistance as the unevenness is formed. Processing,
The fitting part according to claim 7, wherein the formation of the joint portion between the second roll and the third roll is performed by welding of the first sheet base material and the second sheet base material, or adhesion by a hot melt adhesive. Method for forming the stretchable part.