JP2018094217A - Underpants-type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants-type disposable diaper improved in skin touch and improved in a quality of a product.SOLUTION: An underpants-type disposable diaper 1 includes elastic members 71 arranged in a stretched state in a crosswise direction Y between an outer layer sheet 6 and an inner layer sheet 5. The outer layer sheet 6 and the inner layer sheet 5 are fused to each other by fusion parts 8 intermittently arranged between the adjacent elastic members 71. A skin side sheet 6E arranged at a skin facing face side of the inner layer sheet 5, and the inner layer sheet 5 have a part 91T adhered by a first adhesive 91. The first adhesive 91 forms a continuous line extending in the crosswise direction Y while being folded in a longitudinal direction X.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pants-type disposable diaper.

  The disposable diaper includes a so-called pants-type disposable diaper in which an exterior body is arranged outside a vertically long absorbent main body provided with an absorbent body. The present applicant has previously proposed a technique of using a spunbonded nonwoven fabric satisfying predetermined physical property values on the outer surface of such a pants-type disposable diaper exterior body (for example, Patent Document 1).

JP, 2006-005545, A

  According to the pants-type disposable diaper described in Patent Document 1, the touch is improved and the quality of the product is improved. However, there was a need to further improve the touch and further improve the product quality.

  Therefore, this invention is providing the disposable diaper which can eliminate the fault which the prior art mentioned above has.

The present invention has an abdominal region disposed on the ventral side of the wearer, a dorsal region disposed on the dorsal side, and a crotch region positioned therebetween, and from the ventral region to the crotch region. An absorbent main body having a longitudinal direction extending to the dorsal region and a lateral direction perpendicular thereto and including a liquid-retaining absorbent, and disposed on the non-skin facing surface side of the absorbent main body And a pair of side seal portions and a waist opening by joining both side edges along the longitudinal direction of the exterior body in each of the ventral region and the dorsal region. And a pants-type disposable diaper in which a pair of leg openings are formed, wherein the exterior body includes an outer layer sheet that forms a non-skin facing surface of the pants-type disposable diaper, and a skin facing surface side of the outer layer sheet Inner layer sheet, the ventral region and the dorsal side A skin-side sheet disposed on the skin-facing surface side of the inner layer sheet in at least one of the areas, and a plurality of elastic members disposed in a laterally extended state between the outer layer sheet and the inner layer sheet. The outer layer sheet and the inner layer sheet have portions fused to each other by a plurality of fused portions arranged intermittently between the adjacent elastic members, and the skin side sheet has a basis weight. It is a spunbond nonwoven fabric of 17 g / m ² or less, and the skin side sheet and the inner layer sheet have a portion bonded by a first adhesive, and the first adhesive is the pants-type disposable diaper. The present invention provides a pants-type disposable diaper that forms a continuous line extending in the horizontal direction while being folded back in the vertical direction when viewed in a plan view.

  According to the present invention, the touch is further improved and the quality of the product is further improved.

FIG. 1 is a perspective view of a pants-type disposable diaper that is a preferred embodiment of the present invention. FIG. 2 is a partially broken plan view of the diaper shown in FIG. 1 unfolded and stretched as viewed from the skin contact surface side. 3 is a cross-sectional view taken along line III-III shown in FIG. FIG. 4 is a development for explaining a state in which the inner layer folded portion is formed by folding the inner layer sheet and the skin side sheet is formed by the outer layer folded portion obtained by folding the outer layer sheet in the exterior body provided with the diaper shown in FIG. FIG. FIG. 5 is a view of a state in which the outer body provided with the diaper shown in FIG. 1 is expanded and the outer layer sheet before forming the folded portion and the inner layer sheet before forming the folded portion are expanded from the skin contact surface side. FIG. FIG. 6 is an enlarged developed plan view in which a back side region of the developed plan view shown in FIG. 5 is enlarged. Fig.7 (a) is sectional drawing which looked at the state which extended the elastic member and extended the inner layer sheet | seat and the sheet | seat side sheet | seat in the vertical direction, FIG.7 (b) is an inner layer when an elastic member contracts. It is sectional drawing which looked at the state which the sheet | seat and the skin side sheet | seat deform | transformed in the longitudinal direction.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
The disposable diaper of the present invention has a ventral region A disposed on the wearer's ventral side, a dorsal region B disposed on the dorsal side, and a crotch region C positioned therebetween, and a ventral region A. From the crotch region C to the back region B and a horizontal direction Y orthogonal to the vertical direction X. Here, the abdominal region A is a region disposed on the wearer's abdomen when wearing the disposable diaper, and the back region B is a region disposed on the wearer's back when wearing the disposable diaper. .

  1 and 2 show a disposable diaper 1 (hereinafter also referred to as “diaper 1”) which is an embodiment of a pants-type disposable diaper of the present invention. As shown in FIGS. 1 and 2, the diaper 1 is arranged on the non-skin-facing surface side of the absorbent main body 2 including the liquid-retaining absorbent 23 and fixes the absorbent main body 2. The exterior body 3 is provided. The diaper 1 has both side edges (left and right side edges) 3a1, 3a1 along the longitudinal direction X of the ventral region A of the exterior body 3 and both side edges (left and right sides) along the longitudinal direction X of the back side region B of the exterior body 3. A disposable diaper in which a pair of side seal portions S, S, a waist opening WH, and a pair of leg openings LH, LH are formed by joining the side edges 3b1, 3b1. Preferably, the exterior body 3 of the diaper 1 is, as shown in FIG. 2, a plan view of the expanded and extended state of the diaper 1, and a ventral region A disposed on the wearer's ventral side when worn, It is divided into a dorsal region B arranged on the back side of the wearer at the time of wearing, and a crotch region C between the ventral region A and the dorsal region B.

  As shown in FIG. 2, the state where the diaper 1 is expanded and extended as described above is a state where the side seal portion S is peeled off so that the diaper 1 is in an expanded state, and the expanded diaper 1 is replaced with an elastic member of each part. Is extended to the design dimension (same as the dimension when flattened in a state where the influence of the elastic member is completely eliminated).

In the present specification, the “skin facing surface” is a surface of the diaper 1 or a component thereof that faces the wearer's skin when worn, and the “non-skin facing surface” refers to the diaper 1 or a component thereof. Is a surface that is directed to the side opposite to the wearer's skin side (clothing side) when worn. In the diaper 1, the vertical direction (X direction) is a direction extending from the ventral region A to the dorsal region B in a state where the diaper 1 is expanded and extended on a plane. Moreover, the horizontal direction (Y direction) is a direction orthogonal to the vertical direction (X direction), and is the width direction of the diaper 1 in a state where the diaper 1 is expanded and extended on a plane.
Moreover, the diaper 1 is a left-right symmetric form with respect to the vertical centerline CL1 extended in a vertical direction (X direction) shown in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that bisects the diaper 1 in the vertical direction (X direction), and is orthogonal to the vertical center line CL1.

  In the diaper 1, the absorptive main body 2 has a vertically long shape in which the longitudinal direction (X direction) is relatively long in a state in which the diaper 1 is expanded and expanded as shown in FIG. The absorptive main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-permeable surface sheet (including water repellency) that forms a non-skin-facing surface, and both of these sheets 21 and 22. And a liquid-retaining absorbent 23 interposed therebetween. In the diaper 1, the total length in the longitudinal direction (X direction) of the absorbent main body 2 is the same as that of the absorber 23, and the positions of the outer end edges 23A1 and 23B1 of the front and rear end portions 23A and 23B of the absorber 23 are as shown in FIG. As shown in FIG. 3, the outer end edge of the absorbent main body 2 is in the same position as the outer edge. Further, on both sides along the longitudinal direction (X direction) of the absorbent main body 2, as shown in FIG. 2, a leak-proof cuff 24 having an elastic member 25 arranged in an elongated state in the longitudinal direction (X direction), 24 is provided. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and in the vicinity of the free end of each leak-proof cuff 24, a leak-proof cuff forming elastic member. 25 is arranged in a state of extending in the vertical direction (X direction). When the diaper is worn, the free end portion side of the leak-proof cuff 24 rises due to the contraction of the leak-proof cuff forming elastic member 25, and the outflow of body fluid in the lateral direction (Y direction) is prevented.

  In the diaper 1, as shown in FIG. 2, the absorbent body 23 includes only the lower layer absorbent body 231 extending from the ventral region A through the crotch region C to the dorsal region B, and the ventral region A to the crotch region C. The upper absorbent body 232 is extended, and the upper absorbent body 232 and the lower absorbent body 231 are divided into a high basic weight portion 23K having a high basis weight and a peripheral absorbent region 23S around the high basic weight portion 23K. . The lower layer absorbent body 231 is formed in a rectangular shape that is long in the longitudinal direction X over the entire length of the diaper 1 in the longitudinal direction X, and matches the contour shape when the absorbent main body 2 is viewed in plan. In addition, the length of the upper layer absorber 232 in the vertical direction X is shorter than the length of the lower layer absorber 231 in the vertical direction X, and the length in the horizontal direction Y is the length of the lower layer absorber 231 in the horizontal direction Y. The rectangular shape is shorter and longer in the vertical direction X. The high basis weight portion 23K is a region having a two-layer structure including an upper layer absorber 232 and a lower layer absorber 231, and the peripheral absorption region 23S is a region having a single layer structure including only the lower layer absorber 231. The basis weight of the high basis weight portion 23K is larger than the basis weight of the peripheral absorption region 23S. Further, the thickness of the high basis weight portion 23K is larger than the thickness of the peripheral absorption region 23S. Thus, in the diaper 1, the upper layer absorbent body 232 is disposed only from the ventral region A to the crotch region C, and the high basis weight portion 23K is formed at a position displaced to the ventral region A side. ing.

In the diaper 1, the basis weight of the absorbent core constituting the lower layer absorbent body 231 is preferably 100 g / m ² or more 1000 g / m ² or less. The basis weight of the core wrap sheet constituting the lower layer absorbent body 231 is preferably 3 g / m ² or more and 20 g / m ² or less.
Furthermore, the diaper 1, the basis weight of the absorbent core constituting the upper layer absorbent body 232 is preferably 50 g / m ² or more 500 g / m ² or less. The basis weight of the core wrap sheet constituting the upper layer absorbent body 232 is preferably 3 g / m ² or more and 20 g / m ² or less.

  As shown in FIG. 2, the absorbent main body 2 configured as described above has its longitudinal direction (X direction) aligned with the longitudinal direction (X direction) of the diaper 1 in the unfolded and extended state. It is joined to the center part of 3 by the main body fixing adhesive. As described above, the outer package 3 is arranged and bonded and fixed to the non-skin facing surface side of the back sheet 22 constituting the absorbent main body 2 in the thickness direction of the disposable diaper 1. Therefore, in the diaper 1, the absorbent body 23 constituting the absorbent main body 2 is disposed across the ventral region A and the back region B.

  As shown in FIGS. 2 and 3, the outer package 3 is arranged on the outer layer sheet 6 that forms the outer surface of the diaper 1, that is, the non-skin facing surface when worn, and the skin facing surface side of the outer layer sheet 6. The inner layer sheet 5, the skin side sheet 6E disposed on the skin facing surface side of the inner layer sheet 5 in the ventral region A and the back region B, and the outer layer sheet 6 and the inner layer sheet 5 are stretched in the lateral direction Y And a plurality of elastic members 71 arranged in the above. Preferably, in the diaper 1, the exterior body 3 includes an outer layer sheet 6 that forms a non-skin facing surface of the diaper 1, an inner layer sheet 5 on the skin facing surface side of the outer layer sheet 6, and a skin facing surface side of the inner layer sheet 5. Skin side sheet 6E, and further, inner layer sheet 5 in back side region B is folded back on the skin facing surface side of inner layer sheet 5 along the peripheral edge of waist opening WH. In the ventral region A, the inner layer folded portion 5E has an inner layer folded portion 5E on the ventral region A side that is folded back to the skin facing surface side of the inner layer sheet 5 along the peripheral edge of the waist opening WH. . The exterior body 3 includes a plurality of elastic members 71 arranged in an extended state in the lateral direction Y between the outer layer sheet 6 and the inner layer sheet 5, and the elastic members 71 are spaced apart in the longitudinal direction X. Are arranged.

  In the diaper 1, as shown in FIG.2 and FIG.3, the inner-layer sheet | seat 5 is the outer end part 1B of the vertical direction X in the back side area | region B of the diaper 1, in other words, the waist opening part WH, as shown in FIG. The inner periphery of the diaper 1 is folded at the peripheral edge, and the inner layer folded portion 5E is formed by the folding (see FIG. 4). And the inner layer sheet 5 is folded back to the inner surface side of the diaper 1 at the outer end 1A in the longitudinal direction X in the ventral region A of the diaper 1, in other words, at the peripheral edge of the waist opening WH. It has an inner layer folded portion 5E formed by the folding. Thus, the inner layer sheet 5 of the diaper 1 has the inner layer folded portion 5E on the back side region B side and the inner layer folded portion 5E on the ventral region A side. In the diaper 1, the inner folded portion 5 </ b> E extends from the peripheral edge of the waist opening WH toward the crotch region C to a position that does not reach the end in the longitudinal direction X of the absorbent main body 2. In the diaper 1, the inner layer folded portion 5 </ b> E overlaps with the skin facing surface of the inner layer sheet 5.

In the diaper 1, the inner layer sheet 5 having the inner layer folded portion 5E is formed of a hydrophobic nonwoven fabric made of hydrophobic fibers. As the hydrophobic nonwoven fabric, a spunbond nonwoven fabric is preferable. The spunbonded nonwoven fabric forming the inner layer sheet 5 preferably has a basis weight of 15 g / m ² or more and 19 g / m ² or less from the viewpoint of reducing the rigidity.

  Moreover, in the diaper 1, as shown in FIG.2 and FIG.3, the skin side sheet | seat 6E is the back side skin side sheet | seat 6EB distribute | arranged to the back side area | region B, and the ventral side skin side sheet | seat 6EA distribute | arranged to the abdominal side area | region A. And have. Preferably, the outer layer sheet 6 has an inner layer folded portion in the back end region B at the outer end 5B on the back side region B side in the longitudinal direction X of the inner layer sheet 5, in other words, at the peripheral edge of the waist opening WH. It is folded back to the skin facing surface side of 5E (the inner surface side of the diaper 1), and has a dorsal skin side sheet 6EB formed by the folding (see FIG. 4). Further, in the ventral region A, the outer layer sheet 6 has an outer end portion 5A on the ventral region A side in the longitudinal direction X of the inner layer sheet 5, in other words, at the peripheral portion of the waist opening WH. It is folded back to the skin facing surface side (the inner surface side of the diaper 1), and has a ventral skin side sheet 6EA formed by the folding.

  In the diaper 1, as shown in FIGS. 3 and 4, the skin-side sheet 6 </ b> E is a skin of the inner-layer sheet 5 in the back-side region B and the ventral-side region A along the peripheral edge of the waist opening WH. It is formed of an outer layer folded portion that is folded to the opposite surface side. The skin side sheet 6E of the diaper 1 includes a back side skin side sheet 6EB formed by folding the back side region B and a ventral side skin sheet 6EA formed by folding the ventral region A side. . Thus, since the skin side sheet 6E is formed by the outer layer folded portion of the outer layer sheet 6, it becomes a bag-like structure in which the end portion in the longitudinal direction X of the inner layer sheet 5 is not exposed, and the end portion of the inner layer sheet 5 is It is possible to prevent the wearer from touching the skin, and it is difficult to irritate the skin.

  In the diaper 1, as shown in FIG.3 and FIG.4, back side skin side sheet | seat 6EB is distribute | arranged from the peripheral part of waist opening part WH to the position which covers the edge part 23B by the side of the back side area | region B of the absorber 23. Yes. Further, the ventral skin side sheet 6EA is arranged from the peripheral edge of the waist opening WH to a position covering the end 23A on the ventral region A side of the absorber 23. Preferably, the skin side sheet 6E having the dorsal skin side sheet 6EB and the ventral skin side sheet 6EA is arranged from the peripheral edge of the waist opening WH toward the crotch region C. In the diaper 1, the waist opening From the periphery of WH toward the crotch region C, it extends to the position covering the front and rear end portions 23A, 23B in the longitudinal direction X of the absorbent body 23, over the entire inner layer folded portion 5E.

  In the diaper 1, as shown in FIG.3 and FIG.4, the skin side sheet | seat 6E is formed in the vertical direction X longer than the inner-layer folding | returning part 5E. The skin side sheet 6E thus arranged covers the front and rear end portions 23A, 23B in the longitudinal direction X of the absorbent body 23 constituting the absorbent main body 2. Therefore, the skin-side sheet 6E can prevent the front and rear end portions 23A, 23B of the absorbent body 23 constituting the absorbent main body 2 from touching the wearer's skin, making it difficult to irritate the skin. In particular, in the diaper 1, since the high basis weight portion 23K of the absorbent body 23 is formed at a position displaced toward the ventral region A, the absorbent body 23 is covered with the dorsal skin side sheet 6EB. The basis weight of the end portion 23B on the back side region B side is smaller than the basis weight of the end portion 23A on the ventral region A side of the absorbent body 23 covered with the ventral skin side sheet 6EA. Therefore, when the diaper 1 is worn, it is difficult to irritate the skin on the back region B side where the variation in bending is large in order to cover the buttocks of the wearer.

The skin side sheet 6E having the back side skin side sheet 6EB and the ventral side skin side sheet 6EA is formed of a spunbonded nonwoven fabric, and the basis weight thereof is 17 g / m ² or less from the viewpoint of reducing rigidity. It is preferably 15 g / m ² or less. In addition, it is preferable that it is 10 g / m < ² > or more as a lower limit of the basic weight of a spun bond nonwoven fabric.

  As described above, in the diaper 1, the skin side sheet 6E is formed by the outer layer folded portion of the outer layer sheet 6, and the outer layer sheet 6 including the skin side sheet 6E is formed by the spunbonded nonwoven fabric. The spunbond nonwoven fabric to be used is preferably formed from a propylene polymer which is a polyolefin polymer, from the viewpoint of forming a flexible nonwoven fabric. The propylene polymer is preferably a propylene polymer having a molecular weight distribution (Mn / Mn) of 1.5 or more and 3.5 or less. Moreover, as a propylene-type polymer, from a viewpoint used as a smooth and flexible nonwoven fabric, 5 to 100 weight%, more preferably 25 to 80 weight% of any one or more of a random copolymer, a homopolymer, and a block copolymer is used. It is preferable that it consists of resin which contained. These copolymers and homopolymers may be mixed, other resins may be mixed, and a mixture of polypropylene homopolymer and random copolymer may be used. Furthermore, as a random copolymer based on a propylene component, a copolymer copolymerized with ethylene or an α-olefin is preferable, and an ethylene-propylene random copolymer is particularly preferable. From the same viewpoint, the propylene-based polymer is preferably a polymer containing 5 to 100% by weight of an ethylene-propylene random copolymer as a main component, and more preferably 25% by weight or more. preferable. In the ethylene-propylene random copolymer, the ethylene content is preferably 2.0 mol% or more and 10.0 mol% or less, and the ethylene content is more preferably 3.0 mol% or more and 8.0 mol% or less. Further, the propylene polymer is preferably a polymer containing 25% by weight or more of recycled polypropylene resin, and more preferably a polymer containing 50% by weight or more from the viewpoint of the environment.

  From the viewpoint of flexibility, the spunbonded nonwoven fabric used for the outer layer sheet 6 including the skin-side sheet 6E preferably has a crimped long fiber content of 30% by mass or more, and more preferably 40% by mass or more. Preferably, from the viewpoint of form stability, it is preferably 100% by mass or less, more preferably 90% by mass or less, specifically, from the viewpoint of compatibility between flexibility and form stability, 30% by mass. % To 100% by mass, more preferably 40% to 90% by mass.

  Here, the crimped continuous fiber is, for example, melt-spun thermoplastic resin and then cooling the melt-spun filament by applying cooling air at different temperatures from the left and right or front and rear, or cooling air from one side.捲 which is formed by cooling with contact or cooling or cooling a filament that has been melt-spun as a modified cross-section fiber or an eccentric hollow fiber, or a complex melt-spun filament using a polymer having a different melting point The fiber to shrink is shown. The crimped long fiber is usually an actual crimped long fiber having a number of crimps of preferably 10 pieces / 25 mm or more, more preferably 15 pieces / 25 mm or more, and particularly preferably 20 pieces / 25 mm or more. In general, the actual crimped filaments preferably have a fiber diameter in the range of 0.5d to 5.0d, and more preferably in the range of 0.5d to 3.0d. In addition, the number of crimps of the crimped long fiber is measured by the following measuring method.

[Measurement method of crimped number of crimped long fibers (pieces / 25 mm)]
A dividing line with a spatial distance of 25 mm is drawn on a piece of paper having a smooth surface and gloss. Next, each of the crimped long fibers carefully collected from the long fiber web before being heated and pressurized by the embossing roll so as not to impair the crimpability is 25 ± 5% of the spatial distance. Applying looseness, both ends are pasted and fixed to the piece of paper with an adhesive. One sample at a time, attached to the grip of the crimping tester, cut the piece of paper, and then the distance between the grips when the initial load (0.18 mN x number of tex) is applied to the sample (spatial distance) ( mm). Then, the number of crimps at that time is counted, and the number of crimps per 25 mm is obtained. The number of crimps counts all the peaks and valleys, and the half of the number is the crimp number. As for the number of crimps, only the crimped long fibers are taken out of the nonwoven fabric, 20 are measured, and the average value obtained up to one decimal point is defined as the number of crimps. Note that the number of crimps is measured in a temperature-controlled room at a temperature of 20 ± 2 ° C. and a humidity of 65 ± 2% as defined in JIS Z8703 (standard state of the test site).

  The spunbonded nonwoven fabric used for the outer layer sheet 6 including the skin side sheet 6E has a breaking strength in the direction perpendicular to the orientation direction of the constituent fibers of 7.0 N / 50 mm or more from the viewpoint of prevention of breakage during use and processability. It is preferably 8.0 N / 50 mm or more, and preferably 30.0 N / 50 mm or less, specifically 7.0 N / 50 mm or more and 30.0 N / 50 mm or less. It is preferable that it is 8.0 N / 50 mm or more and 30.0 N / 50 mm or less. The breaking strength is measured by the following measurement method.

[Measurement method of breaking strength]
Under an environment of 22 ° C. and 65% RH, the outer sheet 6 is cut into a rectangular shape of 50 mm in the CD direction along the orientation direction of the constituent fibers and 200 mm in the MD direction perpendicular to the CD direction. The cut measurement piece is used as a measurement sample. This measurement sample is attached to a chuck of a tensile tester (for example, Tensilon tensile tester “RTA-100” manufactured by Orientec Co., Ltd.) so that the MD direction becomes the tensile direction. The gap between chucks is 150 mm. Then, the measurement sample is pulled at a speed of 300 mm / min, and the maximum load point until the measurement sample is broken is defined as the breaking strength in the direction (MD direction) orthogonal to the orientation direction of the constituent fibers.

The spunbonded nonwoven fabric used for the outer layer sheet 6 including the skin-side sheet 6E has a plurality of heat-sealed portions that constitute the spunbonded nonwoven fabric by fixing its constituent fibers. From the viewpoint of forming a flexible and soft non-woven fabric, each of the plurality of heat-sealing parts preferably has an area of 0.3 mm ² or less, and more preferably 0.1 mm ² or more and 0.25 mm ² or less. It is particularly preferably 0.1 mm ² or more and 0.2 mm ² or less. The number of heat-sealing parts is preferably 10 / cm ² or more and 250 / cm ² or less, and more preferably 35 / cm ² or more and 65 / cm ² or less.

  In addition, the spunbonded nonwoven fabric used for the outer layer sheet 6 including the skin side sheet 6E is a flexible nonwoven fabric in which the ratio (embossing rate) of the total area of the plurality of heat-sealing portions occupying the surface area of one surface is flexible and soft to the touch. Therefore, it is preferably 15% or less, more preferably 5% or more and 13% or less, and particularly preferably 6% or more and 11% or less.

  The heat-sealed portion constituting the spunbonded nonwoven fabric used for the outer layer sheet 6 including the skin-side sheet 6E is formed intermittently by thermocompression bonding using embossing (by an embossed convex roll and a flat roll), ultrasonic waves Examples thereof include those obtained by fusing and those obtained by partial hot fusing by intermittently applying hot air. Of these, thermocompression bonding is preferred in that the fiber can be easily broken. The shape of the heat fusion part is not particularly limited, and may be any shape such as a circle, a rhombus, and a triangle.

  As described above, in the diaper 1, the exterior body 3 includes the outer layer sheet 6 from the outer surface side of the diaper 1 toward the inner surface side of the diaper 1 in the back region B and the ventral region A as shown in FIG. 3. The inner layer sheet 5, the inner layer folded portion 5E, and the skin side sheet 6E that is the folded portion of the outer layer sheet 6 are provided in this order. In the diaper 1, the outer layer sheet 6 and the inner layer sheet 5 excluding the inner layer folded portion 5E and the skin side sheet 6E are bound inward toward the vertical center line CL1 in the longitudinal direction (X direction) central portion, and are identical to each other. It is formed in the same size. The inner layer folding portion 5E is formed in a rectangular shape that is long in the lateral direction (Y direction) in the back region B and the ventral region A. The skin side sheet 6E is formed in a rectangular shape that is long in the lateral direction (Y direction) in each of the ventral region A and the back region B. The skin side sheet 6E, the inner layer folded portion 5E, the inner layer sheet 5 and the outer layer sheet 6 may be separate sheets. In the diaper 1, the skin side sheet 6E is formed by the folded portion of the outer layer sheet 6. Has been. The inner layer folded portion 5E is formed by the folded portion of the inner layer sheet 5.

  Moreover, in the diaper 1, the exterior body 3 is intermittently extended in the vertical direction (X direction) in the state extended in the horizontal direction Y between the outer layer sheet 6 and the inner layer sheet 5, as shown in FIGS. A plurality of thread-like or belt-like elastic members 71 are provided. In the diaper 1, the elastic member 71 in a state of extending in the lateral direction Y includes the upper ends of the pair of side seal portions S and S located at the periphery of the peripheral portion of the waist opening WH and the pair of side seal portions S and S. A plurality are arranged with a space between the lower end. In the diaper 1, by providing a plurality of elastic members 71, an elastic region having a waist elastic part G1 and a waistline lower elastic part G2 is formed. Moreover, in the diaper 1, between the inner layer sheet | seat 5 and the outer layer sheet | seat 6, as shown in FIG. 2, it has several thread-like or strip | belt-shaped leg elastic members 72 of the expanded state. In the diaper 1, the leg stretchable part G <b> 3 is formed by including a plurality of leg elastic members 72. The leg expansion / contraction part G3 is formed in the peripheral part of the leg opening part LH, as shown in FIG.

  In the diaper 1, the waist stretchable part G <b> 1 is formed in the longitudinal direction (X direction) of the front and rear end parts 23 </ b> A and 23 </ b> B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2, as shown in FIG. 2. It is formed in the end flap located outside the outer end edges 23A1 and 23B1 in the longitudinal direction X (on the opposite side to the lateral center line CL2 side). Further, in the diaper 1, the waistline lower stretchable part G2 is positioned between the lower end of the waist stretchable part G1 on the side of the horizontal center line CL2 and the lower ends of the pair of side seal parts S, S in the longitudinal direction (X direction). It is formed on the side flap.

  In the diaper 1, the exterior body 3 has the some melt | fusion part 8 which joins the outer layer sheet 6 and the inner layer sheet 5, as shown in FIGS. In the diaper 1, the outer layer sheet 6 and the inner layer sheet 5 have a portion (fused portion 8T) fused to each other by a plurality of fused portions 8 disposed intermittently between adjacent elastic members 71, 71. doing. In the diaper 1, the fusion part 8 is a region that extends from the waist stretchable part G <b> 1 to a part of the waistline stretchable part G <b> 2 in the ventral region A and the backside region B, in other words, the skin that is the folded portion of the outer layer sheet 6. It arrange | positions in the position in the outer layer sheet 6 and the inner layer sheet 5 which overlap with the area | region where the side sheet | seat 6E was distribute | arranged. Elastic members 71, 71 adjacent to each other in a region along the longitudinal direction (X direction) in the region of the outer layer sheet 6 and the inner layer sheet 5 corresponding to the region where the skin side sheet 6E is disposed. Are arranged intermittently, and a plurality of fused portion rows 8L including a plurality of fused portions 8 are arranged at intervals in the lateral direction (Y direction) to form a fused portion 8T. Has been.

  As shown in FIGS. 2 to 4, the diaper 1 is disposed between the inner layer sheet 5 and the outer layer sheet 6 fixed by the fusion part 8 in a state of extending in the lateral direction (Y direction) and in the longitudinal direction. A plurality of elastic members 71 are provided intermittently in the (X direction). Preferably, in the diaper 1, in the ventral region A and the dorsal region B, a plurality of elastic members 71 are bonded to a region extending from the waist stretchable part G1 to a part of the waistline lower stretchable part G2. The partial rows 8L are arranged in an extended state in the lateral direction (Y direction) through the gaps between the fused portions 8 of the partial rows 8L.

  In the diaper 1, as shown in FIG.3 and FIG.4, the skin side sheet | seat 6E and the inner layer sheet 5 which comprise the exterior body 3 have the part (adhesive arrangement | positioning part 91T) adhere | attached with the 1st adhesive agent 91. ing. In the ventral region A and the dorsal region B, as shown in FIG. 5, the first adhesive 91 unfolds the outer body 3 of the diaper 1 and forms the outer layer sheet 6 and the folded portion before forming the folded portion. A state in which the inner layer sheet 5 before formation is stretched is viewed in plan, and a continuous line extending in the horizontal direction while being folded back in the vertical direction X is formed. The continuous line of the first adhesive 91 extending in the lateral direction while being folded back in the longitudinal direction X extends in the lateral direction Y while forming a spiral shape at a position to be a folded portion of the outer layer sheet 6. A plurality of continuous lines of the first adhesive 91 extending in the vertical direction X are arranged. The skin-side sheet 6E and the inner layer sheet 5, which are the folded portions of the outer layer sheet 6, are turned into the first adhesive by folding the predetermined position where the continuous lines of the first row of the first adhesive 91 are arranged. 91 has adhesive arrangement portions 91 </ b> T arranged, and are bonded and fixed to each other by the first adhesive 91. The skin side sheet 6E and the inner layer sheet 5 are fixed to each other by the first adhesive 91 forming a continuous line in the adhesive placement portion 91T, and the portion surrounded by the first adhesive 91 is the first. 1 non-joining portions 91N, which are not fixed to each other.

  In the diaper 1, in the state where the outer layer sheet 6 and the inner layer sheet 5 before forming the folded portion shown in FIG. The end portions may or may not overlap each other, but it is preferable that they do not overlap each other from the viewpoint of forming a large number of first non-joining portions 91N.

In the diaper 1, the basis weight of the first adhesive 91 forming a spiral shape is preferably 2 g / m ² or more, more preferably 4 g / m ² or more, and preferably 10 g / m ² or less, more preferably Is 8 g / m ² or less, specifically, preferably 2 g / m ² or more and 10 g / m ² or less, more preferably 4 g / m ² or more and 8 g / m ² or less. The basis weight of the first adhesive 91 can be measured by the following method.

[Measurement Method of Basis Weight of First Adhesive 91]
In either the ventral region A or the dorsal region B, the bonded inner layer sheet 5 and skin side sheet 6E are cut out along the outer edge of the region bonded by one continuous line of the first adhesive 91. Then, the weight (WT1) and area (SQ) of the cut section are measured. Then, the section is immersed in butyl acetate, shaken with tweezers for 3 minutes, taken out on a metal tray, left in a ventilated draft chamber for 48 hours, and the section weight (WT2) after air drying is measured. To do. Using these, the basis weight of the first adhesive 91 is measured from the following formula.

Basis weight of first adhesive 91 BW = (WT1-WT2) / SQ

  The width of the spiral formed by the continuous line of the first adhesive 91 (the length in the direction perpendicular to the direction in which the spiral extends by the continuous line) is preferably 10 mm or more, more preferably 14 mm or more, and Preferably it is 20 mm or less, More preferably, it is 18 mm or less, Specifically, Preferably it is 10 mm or more and 20 mm or less, More preferably, it is 14 mm or more and 18 mm or less. The width of the continuous line of the first adhesive 91 is measured by observing with the naked eye. The spiral width of the first adhesive 91 means the distance between one vertical X end and the other vertical X end in the folding of the continuous line. In the diaper 1, since the continuous line of the first adhesive 91 forms a spiral, it can be regarded as the diameter of a spiral spiral circle formed by the continuous line of the first adhesive 91.

  Moreover, in the diaper 1, as shown in FIG.3 and FIG.4, the end part 6EC of the crotch area C side of the skin side sheet | seat 6E which comprises the exterior body 3, and the crotch area C side of a pair of side seal parts S and S The outer layer sheet 6 and the inner layer sheet 5 are bonded by the second adhesive 92 at a position KT that overlaps the region sandwiched between the end portions SC. In the ventral region A and the dorsal region B, as shown in FIG. 5, the second adhesive 92 unfolds the outer packaging 3 of the diaper 1 and forms the outer layer sheet 6 and the folded portion before forming the folded portion. A state in which the inner layer sheet 5 before formation is stretched is viewed in plan, and a continuous line extending in the horizontal direction while being folded back in the vertical direction X is formed. The continuous line of the second adhesive 92 extending in the horizontal direction while turning back in the vertical direction X extends in the horizontal direction Y while forming a spiral shape at the overlapping position KT, and the continuous line of the second adhesive 92 extending in the horizontal direction. A plurality of lines are arranged in the vertical direction X. In the diaper 1, as described above, the outer layer sheet 6 and the inner layer sheet 5 are fixed to each other by the fusion part row 8L including the plurality of fusion parts 8 in the area corresponding to the area where the skin side sheet 6E is arranged. In the overlapping position KT corresponding to the region sandwiched between the end edge of the end portion 6EC on the crotch region C side of the skin side sheet 6E and the end edge of the end portion SC of the side seal portion S, a plurality of second rows are arranged. They are fixed to each other by a second adhesive 92 forming a continuous line of the adhesive 92. The outer layer sheet 6 and the inner layer sheet 5 are fixed to each other by a second adhesive 92 forming a continuous line, and a portion surrounded by the second adhesive 92 is a second non-joined portion 92N. Are not fixed to each other.

  In the diaper 1, in the state where the outer layer sheet 6 and the inner layer sheet 5 before forming the folded portion shown in FIG. The end portions may or may not overlap each other, but it is preferable that they do not overlap each other from the viewpoint of forming a large number of second non-joining portions 92N.

In the diaper 1, the basis weight of the second adhesive 92 forming a spiral shape is preferably larger than the basis weight of the first adhesive 91, preferably 2 g / m ² or more, more preferably 4 g / m ² or more, and preferably 10 g / m ² or less, more preferably 8 g / m ² or less, specifically preferably 2 g / m ² or more and 10 g / m ² or less, more preferably 4 g / m ^2. m ² or more and 8 g / m ² or less. The basis weight of the second adhesive 92 can be measured by the same method as the basis weight of the first adhesive 91 described above.

  The width of the spiral formed by the continuous line of the second adhesive 92 (the length in the direction orthogonal to the direction in which the spiral extends by the continuous line) is larger than the width of the continuous line of the first adhesive 91. It is preferably 10 mm or more, more preferably 14 mm or more, and preferably 20 mm or less, more preferably 18 mm or less. Specifically, preferably 10 mm or more and 20 mm or less, more preferably 14 mm or more. 18 mm or less. The width of the continuous line of the second adhesive 92 can be measured by the same method as the width of the continuous line of the first adhesive 91. The spiral width of the second adhesive 92 is the same as the spiral width of the first adhesive 91 in that the distance between one vertical X end and the other vertical X end in the folding of the continuous line is as follows. means. In the diaper 1, since the continuous line of the second adhesive 92 forms a spiral, it can be regarded as the diameter of a spiral spiral circle formed by the continuous line of the second adhesive 92.

  Moreover, in the diaper 1, as shown in FIG. 3, the skin opposing surface and the skin side sheet | seat 6E of the inner-layer folding | returning part 5E which comprise the exterior body 3 are being fixed. Preferably, in the ventral region A and the back region B, the skin-side sheet 6E and the inner-layer folded portion 5E that are folded portions of the outer layer sheet 6 are adhesive, heat seal, high-frequency seal, super The diapers 1 are preferably bonded to each other by a plurality of fused portions 8 arranged in a dotted pattern.

  Moreover, in the diaper 1, as shown in FIG. 3, the non-skin opposing surface of the inner layer folding | returning part 5E which comprises the exterior body 3 and the inner layer sheet 5 are being fixed. Preferably, in the ventral region A and the dorsal region B, the inner layer folded portion 5E and the inner layer sheet 5 are bonded to each other through a bonding means such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal at a predetermined portion. The diapers 1 are preferably bonded and fixed with a fourth adhesive 94. The fourth adhesive 94 forms a continuous line extending in the horizontal direction while being folded back in the vertical direction X in a state where the outer layer sheet 6 and the inner layer sheet 5 before the folded portion shown in FIG. The continuous line of the fourth adhesive 94 extending in the horizontal direction while being folded back in the vertical direction X extends in the horizontal direction Y while forming a spiral shape at a position to be the inner layer folded portion 5E in the inner layer sheet 5. The continuous line of the fourth adhesive 94 extending in the direction is preferably arranged in a single or multiple rows in the vertical direction X. In the exterior body 3 of the expanded and extended diaper 1 shown in FIG. Multiple rows are arranged. When the predetermined position where the continuous lines of the fourth row of the fourth adhesive 94 are arranged is folded, the non-skin facing surface of the inner layer folded portion 5E and the inner layer sheet 5 are disposed on the fourth adhesive 94. The adhesive placement portion 94 </ b> T is formed and is fixedly bonded to each other by the fourth adhesive 94. The inner layer folded portion 5E and the inner layer sheet 5 are fixed to each other by the fourth adhesive 94 forming a continuous line in the adhesive disposing portion 94T, and the portion surrounded by the fourth adhesive 94 is the first. 4 non-joining portions 94N, which are not fixed to each other.

  When a plurality of continuous lines of the fourth adhesive 94 are arranged in the vertical direction X, the continuous lines of the fourth adhesive 94 adjacent to each other in the vertical direction X overlap each other at the end in the vertical direction X. However, from the viewpoint of forming a large number of fourth non-joining portions 94N, it is preferable that they do not overlap each other.

  Further, in the diaper 1, a plurality of elastic members 71 arranged in a state of extending in the horizontal direction (Y direction) and intermittently arranged in the vertical direction (X direction), as shown in FIG. 2 and FIG. Each elastic member 71 is an outer layer sheet through a third adhesive 93 at both side edges 3a1, 3a1 of the ventral region A of the exterior body 3 and both side edges 3b1, 3b1 of the back region B of the exterior body 3. 6 and the inner layer sheet 5. The third adhesive 93 is applied only on the surface of each elastic member 71 using a comb gun generally used in the field of absorbent articles, and both side edges of the ventral region A of the exterior body 3. Both side edges 3b1 and 3b1 of the backside region B of 3a1 and 3a1 and the exterior body 3 have portions where the third adhesive 93 is not disposed between the adjacent elastic members 71. As described above, in the diaper 1, the inner layer sheet 5 and the outer layer sheet 6 are provided on both side edges 3 a 1 and 3 a 1 of the ventral region A of the outer package 3 and both side edges 3 b 1 and 3 b 1 of the back region B of the outer package 3. It has a pair of outer fixing regions 3T1 and 3T1 joined via a third adhesive 93 for fixing the elastic member.

  Moreover, in the diaper 1, in the position which overlaps the vicinity of the both sides along the vertical direction (X direction) of the absorptive main body 2, the non-skin facing surface of the inner layer sheet 5 or the skin facing surface of the outer layer sheet 6 The fifth adhesive 95 is applied in a planar shape using a coater generally used in the field, and the plurality of elastic members 71 are connected to the inner layer sheet 5 by the fifth adhesive 95 applied in a planar shape. A pair of main body side fixing regions 3T2 and 3T2 joined to the outer layer sheet 6 are provided.

  In the waist elastic part G1 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are arranged between the pair of outer fixing regions 3T1, 3T1, and these elastic members 71 In each of the outer fixing regions 3T1 and 3T1, the inner layer sheet 5 and the outer layer sheet 6 are fixed between the inner layer sheet 5 and the outer layer sheet 6 by the third adhesive 93, while between the pair of outer fixing regions 3T1 and 3T1. 6 is not fixed. More specifically, in the waist stretchable part G1 of the diaper 1, a plurality of elastic members 71 are arranged between the pair of outer fixing regions 3T1 and 3T1, and these elastic members 71 are paired with the pair of outer fixing regions. In each of 3T1 and 3T1, the inner layer sheet 5 and the outer layer sheet 6 are fixed between the inner layer sheet 5 and the outer layer sheet 6, while between the pair of outer fixed regions 3T1 and 3T1 including the central region in the lateral direction Y. None of them are fixed.

  Further, in the waistline lower stretchable part G2 of the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are disposed between the outer fixed region 3T1 and the main body side fixed region 3T2, The elastic member 71 is fixed between the inner layer sheet 5 and the outer layer sheet 6 in each of the outer fixed region 3T1 and the main body side fixed region 3T2, while between the outer fixed region 3T1 and the main body side fixed region 3T2. Is not fixed to any of the inner layer sheet 5 and the outer layer sheet 6. In the waistline lower stretchable part G2 of the diaper 1, the elastic member 71 is not disposed between the pair of main body side fixing regions 3T2 and 3T2, or the elastic member 71 is fine so as not to exhibit elastic stretchability. It is arranged in a state where it has been processed such as being divided.

  In the leg stretchable part G3 of the diaper 1, as shown in FIG. 2, a plurality of leg elastic members 72 arranged in an extended state on the peripheral edge of the leg opening LH are connected to the inner layer sheet 5 via the sixth adhesive 96. It is fixed between the outer layer sheet 6. Preferably, in the diaper 1, as shown in FIG. 5, in the crotch region C, the outer layer sheet 6 and the inner layer sheet 5 constituting the exterior body 3 are bonded by a sixth adhesive 96. In the crotch region C, as shown in FIG. 5, the sixth adhesive 96 expands the outer package 3 of the diaper 1 to form the outer layer sheet 6 before forming the folded portion and the inner layer sheet before forming the folded portion. 5 in a plan view, the plurality of pieces arranged between the outer layer sheet 6 and the inner layer sheet 5 and arranged in a curved shape along each of the pair of leg openings LH and LH. The leg elastic member 72 is fixed. A plurality of sixth adhesives 96 are disposed along the lateral direction Y, and each sixth adhesive 96 is disposed across the entire width of the diaper 1 in parallel to the lateral direction Y, and a plurality of sixth adhesives 96 are disposed. The material 96 is applied in a stripe shape.

  The sixth adhesive 96 disposed in the crotch region C is applied to the skin facing surface of the outer layer sheet 6 or the non-skin facing surface of the inner layer sheet 5 using, for example, a coater generally used in the field of absorbent articles. It is applied in stripes.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
As the top sheet 21, the back sheet 22, the absorber 23, the leak-proof cuff 24, etc. constituting the absorbent main body 2, various kinds of materials conventionally used for absorbent articles such as disposable diapers are used without particular limitation. Can do. For example, as the surface sheet 21, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. As the back sheet 22, a moisture-permeable resin film or the like can be used. As the absorbent body 23, an absorbent core made of absorbent polymer particles and a fiber material and covered with a tissue paper can be used. Moreover, as the leak-proof cuff 24, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.

  Examples of the elastic member (the elastic member 25 for forming a leakproof cuff, the elastic member 71, the leg elastic member 72, etc.) include synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, A polyurethane etc. can be mentioned. As the form of the elastic member, a thread-like (thread rubber etc.) having a cross section of a rectangle, a square, a circle, an ellipse, a polygon or the like, or a string-like (flat rubber etc.) can be preferably used.

  Elastic member fixing adhesive for fixing elastic members (such as the leakage preventing cuff forming elastic member 25, the elastic member 71, the leg elastic member 72, etc.), and the main body fixing adhesive for fixing the exterior body 3, the absorbent main body 2 and the like Specifically, as the first adhesive 91, the second adhesive 92, the third adhesive 93, the fourth adhesive 94, the fifth adhesive 95, the sixth adhesive 96, and the like, absorbability of disposable diapers and the like Various hot melt adhesives conventionally used for articles can be used without particular limitation.

The effect of the diaper 1 of this embodiment mentioned above is demonstrated.
In the diaper 1 described above, as shown in FIG. 1 and FIG. A plurality of elastic members 71 arranged in a stretched state, and the outer layer sheet 6 and the inner layer sheet 5 are formed by a plurality of fused portions 8 that are intermittently disposed between adjacent elastic members 71, 71. It has a fused portion 8T fused to each other. In the diaper 1, the waist stretchable part G1 and the waistline lower stretchable part G2 which are the fusion part 8T of the exterior body 3 are arranged in an extended state in the lateral direction (Y direction) between the inner layer sheet 5 and the outer layer sheet 6 and Due to the contraction of the plurality of elastic members 71 arranged intermittently in the longitudinal direction (X direction), the outer layer sheet 6 between the fusion part rows 8L and 8L adjacent in the lateral direction (Y direction) swells outward. Thus, the skin side sheet 6E and the inner layer sheet 5 are deformed so as to swell inward to form a gathered portion. The feeling of stuffiness during use of the diaper 1 can be improved by the space formed by deformation in this way.

In the diaper 1 described above, the skin side sheet 6E, which is the innermost sheet that forms the skin facing surface of the exterior body 3, is composed of a spunbond nonwoven fabric of 17 g / m ² or less, and the skin side sheet 6E and the inner layer sheet 4 and 5, as shown in FIG. 4 and FIG. 5, an adhesive disposition portion 91 </ b> T that is a portion bonded by a first adhesive 91 that forms a continuous line extending in the horizontal direction while being folded back in the vertical direction X. ing. In the adhesive placement portion 91T, the skin side sheet 6E and the inner layer sheet 5 are fixed to each other by the first adhesive 91 forming a continuous line, as shown in FIGS. 3 and 7A. A portion surrounded by the first adhesive 91 is a first non-joined portion 91N, and is not fixed to each other. For this reason, as shown in FIG. 7B, the skin side is caused by contraction of a plurality of elastic members 71 that are arranged in a stretched state in the lateral direction (Y direction) and intermittently arranged in the longitudinal direction (X direction). The first non-joined portion 91N of the sheet 6E and the inner layer sheet 5 is easily swelled and deformed. When the skin side sheet 6E is swelled and deformed inward on the wearer side in this way, it is formed to fix the areas of the outer layer sheet 6 and the inner layer sheet 5 corresponding to the area where the skin side sheet 6E is arranged. The fusion part 8 is difficult to touch the wearer's skin, and together with the skin side sheet 6E composed of a soft non-woven fabric called spunbond non-woven fabric of 17 g / m ² or less, the touch is further improved, and the quality of the diaper 1 Is further improved.

  Moreover, in the diaper 1 mentioned above, as shown in FIG.3 and FIG.4, it overlaps corresponding to the area | region pinched | interposed by the edge part 6EC by the side of the crotch area | region C of the skin side sheet | seat 6E, and the edge part SC of the side seal part S. At the position KT, the outer layer sheet 6 and the inner layer sheet 5 are fixed to each other by a second adhesive 92 that forms a continuous line, and a portion surrounded by the second adhesive 92 is a second non-joined portion 92N. And are not fixed to each other. Therefore, the second non-bonding of the outer layer sheet 6 and the inner layer sheet 5 is caused by contraction of the plurality of elastic members 71 arranged in the lateral direction (Y direction) and intermittently arranged in the vertical direction (X direction). The portion 92N is swollen and easily deformed (see FIG. 7B). In this way, at the overlapping position KT, if the inner layer sheet 5 swells and deforms inward on the wearer side, the end part 6EC on the crotch region C side of the skin side sheet 6E and the end part SC of the side seal part S In the sandwiched area, the touch is further improved, and the quality of the diaper 1 is further improved.

  Moreover, in the diaper 1 mentioned above, as shown in FIG.2 and FIG.6, both the side edge parts 3a1 and 3a1 of the ventral | abdominal side area A of the exterior body 3 and the both side edge parts 3b1 and 3b1 of the back side area | region B of the exterior body 3 are provided. Each of the pair of side seal portions S and S to be joined has an outer fixing region 3T1 for fixing the elastic member 71, and each outer fixing region 3T1 is third bonded between the elastic members 71 and 71 adjacent in the longitudinal direction X. It has a portion where the agent 93 is not arranged. Therefore, it can prevent that a pair of side seal part S and S becomes hard too much, the touch improves further, and the quality of the diaper 1 further improves.

  Moreover, in the diaper 1 mentioned above, as shown in FIG. 3, it is the skin opposing surface of the inner layer folding | returning part 5E which comprises the exterior body 3, and the folding part of the outer layer sheet | seat 6 in the abdominal side area | region A and the back side area | region B. The skin-side sheet 6E is fixed to each other by a plurality of fused portions 8 arranged in the form of dots. For this reason, it is difficult for the feeling of wear to deteriorate due to the displacement and position of the elastic members 71, and the elastic member 71, the outer layer sheet 6, and the skin side sheet 6E move independently, for example, contraction of the elastic member 71. As a result, the outer layer sheet 6 and the skin side sheet 6E are likely to have irregularities serving as cushions, and the effect of reducing irritation to the skin is achieved. In addition, from the viewpoint of the touch, it is preferable that the fixation between the skin facing surface of the inner layer folded portion 5E and the skin side sheet 6E is not the fused portion 8 but an adhesive.

  Moreover, in the diaper 1 mentioned above, as shown in FIG. 3, the non-skin opposing surface and inner layer sheet | seat 5 of the inner-layer folding | returning part 5E which comprise the exterior body 3 are being fixed in the abdominal area A and the back area B. Yes. Therefore, the waist opening WH has an effect of suppressing the deterioration of wearing feeling and appearance due to unexpected deformation such as the inner layer folded portion 5E being separated from the inner layer sheet 5. In the diaper 1, the non-skin facing surface of the inner layer folded portion 5 </ b> E and the inner layer sheet 5 have an adhesive arrangement portion 94 </ b> T in which a fourth adhesive 94 is arranged, and the adhesive arrangement portion 94 </ b> T has an inner layer folded portion. 5E and the inner layer sheet 5 are bonded and fixed to each other by a fourth adhesive 94, and a portion surrounded by the fourth adhesive 94 forming a continuous line is a fourth non-joined portion 94N. It is not fixed. For this reason, due to the contraction of the plurality of elastic members 71 arranged in the horizontal direction (Y direction) and intermittently arranged in the vertical direction (X direction), the inner layer folded portion 5E and the fourth non-folding of the inner layer sheet 5 are caused. The joining portion 94N swells and is easily deformed (see FIG. 7B). If it deform | transforms in this way, the unevenness | corrugation which plays the role of a cushion will be easy to produce between the non-skin opposing surface of the inner-layer folding | returning part 5E and the inner-layer sheet | seat 5, for example by shrinkage | contraction of the elastic member 71, and the effect which reduces the irritation | stimulation to skin. Play.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.

  For example, as shown in FIGS. 3 and 4, the diaper 1 described above has an inner layer sheet 5, an inner layer folded portion 5 </ b> E, and an outer layer sheet 6 as non-woven fabrics constituting the exterior body 3 in the ventral region A and the dorsal region B. And the skin side sheet 6E which is the folding | turning part of the outer layer sheet | seat 6 is provided, However, The structure of the nonwoven fabric which forms the exterior body 3 of the ventral | abdominal area | region A and the back | dorsal area | region B may differ. For example, the nonwoven fabric constituting the exterior body 3 in the back region B has an inner layer sheet 5, an inner layer folded portion 5E, an outer layer sheet 6, and a skin side sheet 6E, and constitutes the exterior body 3 in the ventral region A. The form which has only the inner layer sheet 5 and the outer layer sheet 6 may be sufficient as the nonwoven fabric to do.

  Moreover, as shown in FIG.3 and FIG.4, the diaper 1 mentioned above WHEREIN: In the ventral | abdominal area | region A and the back | dorsal area | region B, as the nonwoven fabric which comprises the exterior body 3, the inner-layer sheet 5, the inner-layer folding | returning part 5E, and the outer-layer sheet 6 Although it has the skin side sheet 6E that is the folded portion of the outer layer sheet 6, it may not have the inner layer folded portion 5E.

  Further, as shown in FIGS. 3 and 4, the diaper 1 described above has an inner layer sheet 5, an outer layer sheet 6, and a skin side sheet 6 </ b> E that is a folded portion of the outer layer sheet 6 as a nonwoven fabric constituting the outer package 3. However, the skin side sheet 6 </ b> E may not be formed at the folded portion of the outer layer sheet 6. That is, as the nonwoven fabric constituting the exterior body 3, in addition to the inner layer sheet 5 and the outer layer sheet 6, the skin side sheet 6E made of separate hydrophobic fibers may be provided.

  Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 2, the exterior body 3 is a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the ventral region A, the crotch region C, and the dorsal region B. The exterior body 3 may be a split-type pants-type disposable diaper that is divided as a separate member into a ventral-side exterior body, a back-side exterior body, and a crotch exterior body.

  The following underpants-type disposable diaper is further disclosed regarding the embodiment mentioned above.

<1>
A ventral region disposed on the ventral side of the wearer, a dorsal region disposed on the dorsal side, and a crotch region positioned therebetween, and the dorsal side from the ventral region through the crotch region An absorbent body having a longitudinal direction extending in the region and a transverse direction perpendicular thereto, and including a liquid-retaining absorbent, and the absorbent body disposed on the non-skin facing surface side of the absorbent body. A pair of side seal portions, a waist opening portion, and a pair of legs joined to each other along the longitudinal direction of the exterior body in each of the ventral region and the dorsal region. A pants-type disposable diaper in which an opening is formed,
The exterior body includes an outer layer sheet forming a non-skin facing surface of the pants-type disposable diaper, an inner layer sheet disposed on the skin facing surface side of the outer layer sheet, and at least one of the ventral region and the dorsal region A skin-side sheet disposed on the skin-facing surface side of the inner layer sheet, and a plurality of elastic members disposed in a laterally extended state between the outer layer sheet and the inner layer sheet,
The outer layer sheet and the inner layer sheet have portions fused to each other by a plurality of fused portions disposed intermittently between the adjacent elastic members,
The skin side sheet is a spunbonded nonwoven fabric having a basis weight of 17 g / m ² or less,
The skin side sheet and the inner layer sheet have a portion bonded by a first adhesive,
The first adhesive is a pants-type disposable diaper that forms a continuous line extending in the horizontal direction while being folded back in the vertical direction when the pants-type disposable diaper is unfolded and extended in plan view.

<2>
The skin side sheet is arranged from the peripheral edge of the waist opening toward the crotch region,
The fusion part for fusing the outer layer sheet and the inner layer sheet is arranged at a position overlapping the region where the skin side sheet is arranged,
In the position overlapping the region sandwiched between the end portion on the crotch region side of the skin side sheet and the end portion on the crotch region side of the pair of side seal portions, the outer layer sheet and the inner layer sheet are second It is bonded with an adhesive,
The said 2nd adhesive agent forms the continuous line extended in a horizontal direction, turning back in the vertical direction in the planar view when the state which expand | deployed and expanded the said underpants type disposable diaper is described in said <1>. Pants-type disposable diaper.
<3>
The outer layer sheet and the inner layer sheet are fixed to each other by the second adhesive forming a continuous line, and a portion surrounded by the second adhesive is a second non-joined portion, The pants-type disposable diaper according to <2>, which is not fixed.
<4>
In a state where the outer layer sheet and the inner layer sheet before forming the folded portion are stretched, the continuous lines of the second adhesive adjacent in the vertical direction do not overlap with each other at the end in the vertical direction, The pants-type disposable diaper according to <2> or <3>.
<5>
The pants-type disposable diaper according to any one of <2> to <4>, wherein the basis weight of the second adhesive forming a spiral shape is larger than the basis weight of the first adhesive.
<6>
The basis weight of the second adhesive forming a spiral is 2 g / m ² or more, preferably 4 g / m ² or more, and 10 g / m ² or less, preferably 8 g / m ² or less. The pants-type disposable diaper according to any one of <2> to <5>.
<7>
The width of the spiral formed by the continuous line of the second adhesive (the length in the direction perpendicular to the extending direction of the spiral by the continuous line) is larger than the width of the continuous line of the first adhesive, The underpants-type disposable diaper according to any one of <2> to <6>.
<8>
The width of the spiral formed by the continuous line of the second adhesive (the length in the direction perpendicular to the extending direction of the spiral by the continuous line) is 10 mm or more, preferably 14 mm or more, and 20 mm or less, The pants-type disposable diaper according to any one of the above <2> to <7>, which is preferably 18 mm or less.
<9>
<2> to <8, wherein the elastic member contracts and the outer layer sheet surrounded by the second adhesive forming the continuous line and the second non-joined portion of the inner layer sheet swell and deform. > The pants-type disposable diaper according to any one of the above.

<10>
Each of the elastic members is bonded to the outer layer sheet and the inner layer sheet via a third adhesive at both side edges of the ventral region and both side edges of the back region in the exterior body,
Both the side edges of the ventral region and the side edges of the dorsal region of the exterior body have portions where the third adhesive is not disposed between the adjacent elastic members. The pants-type disposable diaper according to any one of <9>.
<11>
The skin-side sheet extends to any one of <1> to <10>, which extends from a peripheral edge of the waist opening to a position that covers an end of the absorbent main body on the back side region side. Pants-type disposable diapers as described.
<12>
The inner layer sheet has an inner layer folded portion that is folded to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the back region. The pants-type disposable diaper according to any one of <1> to <11>, wherein the skin facing surface of the skin and the skin side sheet are fixed.
<13>
The inner layer sheet has an inner layer folded portion folded at the skin facing surface side of the inner layer sheet along a peripheral edge of the waist opening in at least one of the ventral region and the dorsal region. The underpants-type disposable diaper according to any one of <1> to <12>, wherein the non-skin facing surface of the part and the inner layer sheet are fixed.
<14>
The skin-side sheet is an outer-layer folded portion in which the outer-layer sheet is folded back to the skin-facing surface side of the inner-layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the back-side region. The pants-type disposable diaper according to any one of <1> to <13>.
<15>
The skin side sheet has a dorsal skin side sheet disposed in the dorsal region and a ventral skin side sheet disposed in the ventral region,
The dorsal skin side sheet is arranged from the peripheral edge of the waist opening to a position covering the end on the dorsal region side of the absorber,
The ventral skin side sheet is arranged from the peripheral edge of the waist opening to a position covering the ventral region end of the absorber.
In the absorber, the basis weight of the end on the back side region side of the absorber covered with the back side skin sheet is the vent side region of the absorber covered with the ventral skin side sheet. The underpants-type disposable diaper according to any one of the above <1> to <14>, which is smaller than the basis weight of the side end.
<16>
The inner layer sheet has an inner layer folded portion that is folded to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the dorsal region,
The pants-type disposable diaper according to any one of <1> to <15>, wherein the skin side sheet is formed longer than the inner layer folded portion in the longitudinal direction.
<17>
The skin side sheet is formed of a spunbonded nonwoven fabric, and the basis weight thereof is preferably 17 g / m ² or less and 15 g / m ² or less, and the lower limit value of the basis weight is 10 g / m ² or more. The pants-type disposable diaper according to any one of <1> to <16>.
<18>
The outer layer sheet including the skin side sheet is formed of a spunbond nonwoven fabric,
<1> to <17>, wherein the outer layer sheet has a crimped long fiber content of 30% by mass or more, preferably 40% by mass or more, and 100% by mass or less, preferably 90% by mass or less. The underpants type disposable diaper of any one.

<19>
The skin side sheet is formed of a spunbond nonwoven fabric,
The skin-side sheet has a breaking strength in a direction orthogonal to the orientation direction of the fibers constituting the skin-side sheet of 7.0 N / 50 mm or more, preferably 8.0 N / 50 mm or more, and 30.0 N The underpants-type disposable diaper according to any one of <1> to <18>, which is / 50 mm or less.
<20>
The spunbonded nonwoven fabric used for the skin-side sheet has a plurality of heat-bonded portions that constitute the spunbonded nonwoven fabric by fixing its constituent fibers, and each of the plurality of heat-bonded portions has an area of 0. .3Mm ² or less, preferably 0.1 mm ² or more 0.25 mm ² or less, further preferably 0.1 mm ² or more 0.2 mm ² or less, pants according to any one of <1> to <19> Type disposable diaper.
<21>
The spunbonded nonwoven fabric used for the skin-side sheet has a total area ratio (embossing rate) of the plurality of heat-sealed portions in the surface area of one surface thereof of 15% or less, preferably 5% or more and 13% or less. The underpants-type disposable diaper according to any one of <1> to <20>, which is preferably 6% or more and 11% or less.
<22>
The skin side sheet and the inner layer sheet are fixed to each other by the first adhesive forming a continuous line in the adhesive arrangement portion, and surrounded by the first adhesive forming the continuous line. The pants-type disposable diaper according to any one of <1> to <21>, wherein the portion is a first non-joined portion and is not fixed to each other.
<23>
In the state where the outer layer sheet and the inner layer sheet 5 are stretched before forming the folded portion, the continuous lines of the first adhesive adjacent in the vertical direction do not overlap with each other at the end in the vertical direction, The pants-type disposable diaper according to any one of <1> to <22>.
<24>
The basis weight of the first adhesive forming a spiral shape is 2 g / m ² or more, preferably 4 g / m ² or more, and 10 g / m ² or less, preferably 8 g / m ² or less. The pants-type disposable diaper according to any one of <1> to <23>.
<25>
The width of the continuous line of the first adhesive forming the spiral shape (the length in the direction perpendicular to the direction in which the continuous line extends) is 10 mm or more, preferably 14 mm or more, and 20 mm or less, preferably The pants-type disposable diaper according to any one of the above items <1> to <24>, which is 18 mm or less.
<26>
The inner layer sheet has an inner layer folded portion that is folded to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the dorsal region,
The inner layer folded portion and the inner layer sheet are bonded and fixed by a fourth adhesive,
The fourth adhesive forms a continuous line extending in the lateral direction while being folded back in the vertical direction in a state where the outer layer sheet and the inner layer sheet are stretched before forming the folded portion. The underpants-type disposable diaper according to any one of <25>.

<27>
A continuous line of the fourth adhesive extending in the horizontal direction while being folded back in the vertical direction extends in the horizontal direction while forming a spiral shape at a position to be the inner layer folded portion in the inner layer sheet. The underpants-type disposable diaper according to the above <26>, wherein a plurality of continuous lines of extended fourth adhesive are arranged in the vertical direction.
<28>
The inner layer folded portion and the inner layer sheet are fixed to each other by the fourth adhesive forming a continuous line in the adhesive placement portion, and the portion surrounded by the fourth adhesive is the fourth non-sticking portion. The pants-type disposable diaper according to the above <26> or <27>, which is a joined portion and is not fixed to each other.
<29>
A plurality of continuous lines of the fourth adhesive are arranged in the vertical direction, and the continuous lines of the fourth adhesive adjacent to each other in the vertical direction do not overlap with each other at the end in the vertical direction. The pants-type disposable diaper according to any one of> to <28>.
<30>
The inner layer sheet and the outer layer sheet are bonded to both side edges of the ventral region of the exterior body and both side edges of the back side region of the exterior body via a third adhesive for fixing an elastic member. A pair of outer fixation regions
A plurality of the elastic members are arranged between a pair of the outer fixing regions, and the elastic members are arranged between the inner layer sheet and the outer layer sheet in each of the pair of outer fixing regions. While fixed by three adhesives, between the pair of outer fixing regions, it is not fixed to either the inner layer sheet or the outer layer sheet, any one of <1> to <29> Pants-type disposable diapers.
<31>
The pants-type disposable diaper according to any one of <1> to <30>, wherein in the inseam region, the outer layer sheet and the inner layer sheet constituting the exterior body are bonded with a sixth adhesive.
<32>
A plurality of the sixth adhesives are disposed along the lateral direction, and the sixth adhesive is disposed over the entire width of the pants-type disposable diaper in parallel with the lateral direction. The pants-type disposable diaper according to <31>, wherein the agent is applied in a stripe shape.
<33>
<1> to <1>, wherein the elastic member contracts and the first non-bonded portion of the skin side sheet and the inner layer sheet surrounded by the first adhesive forming the continuous line swells and deforms. The pants-type disposable diaper according to any one of 32>.
<34>
The absorber has a lower layer absorber extending from the ventral region through the crotch region to the dorsal region, and an upper layer absorber extending only from the ventral region to the crotch region, The underpants-type disposable diaper according to any one of <1> to <33>.

<35>
The upper layer absorbent body is disposed only from the ventral region to the crotch region, and the high basis weight portion is formed at a position displaced to the ventral region side. Pants-type disposable diapers.
<36>
The basis weight of the absorbent core constituting the lower layer absorbent is 100 g / m ² or more and 1000 g / m ² or less, and the basis weight of the core wrap sheet constituting the lower layer absorbent is 3 g / m ² or more and 20 g / m ^2. The pants-type disposable diaper according to <34> or <35>, which is m ² or less.
<37>
The basis weight of the absorbent core constituting the upper layer absorbent is 50 g / m ² or more and 500 g / m ² or less, and the basis weight of the core wrap sheet constituting the upper layer absorbent is 3 g / m ² or more and 20 g / m ^2. m is ² or less, pants-type disposable diaper according to any one of the <34> - <36>.
<38>
In the back side region, the inner layer sheet is folded back to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening, and in the ventral region, The inner layer folded portion on the ventral region side that is folded on the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening portion, according to any one of the above <1> to <37>. Pants-type disposable diapers.
<39>
The pants-type disposable diaper according to <38>, wherein the inner layer sheet having the inner layer folded portion is formed of a hydrophobic nonwoven fabric made of hydrophobic fibers.
<40>
The pants-type disposable diaper according to <39>, wherein the hydrophobic nonwoven fabric is a spunbond nonwoven fabric.
<41>
The pants-type disposable diaper according to <40>, wherein the spunbonded nonwoven fabric forming the inner layer sheet has a basis weight of 15 g / m ² or more and 19 g / m ² or less.

DESCRIPTION OF SYMBOLS 1 Pants-type disposable diaper 1B Longitudinal outer end 1A in the dorsal region 1A Longitudinal outer end 2 in the ventral region Absorbent body 21 Top sheet 22 Back sheet 23 Absorber 24 Leak-proof cuff 25 Elastic member 3 Exterior body 5 Inner layer sheet 5E Inner layer folded portion 6 Outer layer sheet 6E Skin side sheet (outer layer folded portion)
71 elastic member 72 leg elastic member 8 fusion part 8L fusion part row 91-96 first to sixth adhesives 91N first non-joining part 92N second non-joining part 94N fourth non-joining part A ventral region, B back Side area, C Inseam area

Claims (8)

A ventral region disposed on the ventral side of the wearer, a dorsal region disposed on the dorsal side, and a crotch region positioned therebetween, and the dorsal side from the ventral region through the crotch region An absorbent body having a longitudinal direction extending in the region and a transverse direction perpendicular thereto, and including a liquid-retaining absorbent, and the absorbent body disposed on the non-skin facing surface side of the absorbent body. A pair of side seal portions, a waist opening portion, and a pair of legs joined to each other along the longitudinal direction of the exterior body in each of the ventral region and the dorsal region. A pants-type disposable diaper in which an opening is formed,
The exterior body includes an outer layer sheet forming a non-skin facing surface of the pants-type disposable diaper, an inner layer sheet disposed on the skin facing surface side of the outer layer sheet, and at least one of the ventral region and the dorsal region A skin-side sheet disposed on the skin-facing surface side of the inner layer sheet, and a plurality of elastic members disposed in a laterally extended state between the outer layer sheet and the inner layer sheet,
The outer layer sheet and the inner layer sheet have portions fused to each other by a plurality of fused portions disposed intermittently between the adjacent elastic members,
The skin side sheet is a spunbonded nonwoven fabric having a basis weight of 17 g / m ² or less,
The skin side sheet and the inner layer sheet have a portion bonded by a first adhesive,
The first adhesive is a pants-type disposable diaper that forms a continuous line extending in the horizontal direction while being folded back in the vertical direction when the pants-type disposable diaper is unfolded and extended in plan view. The skin side sheet is arranged from the peripheral edge of the waist opening toward the crotch region,
The fusion part for fusing the outer layer sheet and the inner layer sheet is arranged at a position overlapping the region where the skin side sheet is arranged,
In the position overlapping the region sandwiched between the end portion on the crotch region side of the skin side sheet and the end portion on the crotch region side of the pair of side seal portions, the outer layer sheet and the inner layer sheet are second It is bonded with an adhesive,
2. The pants according to claim 1, wherein the second adhesive forms a continuous line extending in a horizontal direction while being folded back in a vertical direction when the expanded and extended state of the pant-type disposable diaper is viewed in plan. Type disposable diaper. The elastic member is bonded to the outer layer sheet and the inner layer sheet via a third adhesive at both side edges of the ventral region and both side edges of the back region in the exterior body,
The both side edges of the ventral region and the back side regions of the exterior body have portions where the third adhesive is not disposed between the adjacent elastic members. The pants-type disposable diaper described in 1.   The said skin side sheet | seat is extended to the position which covers the edge part by the side of the said dorsal region of the said absorptive main body from the peripheral part of the said waist opening part. Pants-type disposable diaper. The inner layer sheet has an inner layer folded portion that is folded to the skin facing surface side of the inner layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the back region. The underpants type disposable diaper of any one of Claims 1-4 by which the skin opposing surface and the said skin side sheet | seat are being fixed. The inner layer sheet has an inner layer folded portion folded at the skin facing surface side of the inner layer sheet along a peripheral edge of the waist opening in at least one of the ventral region and the dorsal region. The pants-type disposable diaper according to any one of claims 1 to 5, wherein a non-skin facing surface of the part and the inner layer sheet are fixed.   The skin-side sheet is an outer-layer folded portion in which the outer-layer sheet is folded back to the skin-facing surface side of the inner-layer sheet along the peripheral edge of the waist opening in at least one of the ventral region and the back-side region. The pants-type disposable diaper according to any one of claims 1 to 6. The skin side sheet has a dorsal skin side sheet disposed in the dorsal region and a ventral skin side sheet disposed in the ventral region,
The dorsal skin side sheet is arranged from the peripheral edge of the waist opening to a position covering the end on the dorsal region side of the absorber,
The ventral skin side sheet is arranged from the peripheral edge of the waist opening to a position covering the ventral region end of the absorber.
In the absorber, the basis weight of the end on the back side region side of the absorber covered with the back side skin sheet is the vent side region of the absorber covered with the ventral skin side sheet. The pants-type disposable diaper according to any one of claims 1 to 7, wherein the pants-type disposable diaper is smaller than the basis weight of the end portion on the side.

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