Pants-type disposable wear

Abstract

To suppress deterioration of the texture of an exterior body due to adhesion while ensuring adhesive strength of the interior body. [Solution] The above problem is solved by providing adhesive sections b1 to b5 only in the first region 21, second region 22, third region 23, and fourth region 24 located on the periphery of the front overlap region 81 where the inner body 200 and the front outer body 12F overlap, and the rear overlap region 82 where the inner body 200 and the rear outer body 12B overlap, and providing no adhesive section in the central region 25, and by making the basis weight of the hot melt adhesive HM1, HM2 in the adhesive section b1 where the first region 21 and the third region 23 overlap and the adhesive section b1 where the first region 21 and the fourth region 24 overlap greater than the basis weight of the hot melt adhesive HM1, HM2 in the other adhesive sections b2 to b5.

Description

[Technical Field]

[0001] The present invention relates to a pants-type disposable wearing article such as a pants-type disposable diaper. [Background technology]

[0002] One type of pants-type disposable wearing article is known, which includes a tubular outer body formed by joining both side edges of a front outer body and both side edges of a rear outer body with side seals, and an inner body extending from the front outer body through the crotch area to the rear outer body, with the front and rear outer bodies not being continuous at the crotch area but separated in the front-to-rear direction (see, for example, Patent Document 1). Unlike a type in which the outer body is continuous in the front-to-rear direction (see, for example, Patent Document 2), this two-piece outer body type has the advantage that it is not necessary to cut the outer body to form leg openings, or if it is cut, only a small area is required. In other words, because the cut-off pieces (trim) are discarded, this has the advantage of reducing waste of material (trim loss).

[0003] In pants-type disposable diapers with a two-piece outer casing, the inner body is generally bonded to the front and rear outer bodies with a hot melt adhesive. Furthermore, in pants-type disposable diapers with a two-piece outer casing, these adhesive joints must be firmly bonded, so the hot melt adhesive is generally applied uniformly over almost the entire front overlapping region where the inner body and the front outer body overlap, and the rear overlapping region where the inner body and the rear outer body overlap.

[0004] However, in such general adhesive areas, even if one tries to increase the adhesive strength of the edge on the crotch side, which requires particularly strong adhesion, the only way to do so is to increase the overall amount of adhesive applied, which may damage the texture of the outer body in the front overlap region and the rear overlap region. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-13580 [Patent Document 2] Japanese Patent Application Publication No. 2019-205853 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, a main object of the present invention is to prevent deterioration of texture due to adhesion while ensuring adhesive strength of the interior body in at least one of the front exterior body and the rear exterior body. [Means for solving the problem]

[0007] The following pants-type disposable wearing article has solved the above problems. <First aspect> A front body and a back body, A front exterior body provided on the front body; A rear exterior body provided on the rear body; An inner body extending from a widthwise intermediate portion of the front body through a crotch portion to a widthwise intermediate portion of the back body; an adhesive portion in which the inner body and the front outer body are joined via a hot melt adhesive in a front overlapping region where the inner body and the front outer body overlap; an adhesive portion in which the inner body and the rear outer body are joined via a hot melt adhesive in a rear overlapping region where the inner body and the rear outer body overlap; side seals formed by joining both side portions of the exterior body in the front body and both side portions of the exterior body in the back body; A waist opening and a pair of left and right leg openings are provided, the front exterior body and the rear exterior body are spaced apart in the front-rear direction, At least one of the front overlapping region and the back overlapping region has a first region in which the adhesive portions are provided continuously or intermittently along the crotch side edge and at both widthwise ends, a second region in which the adhesive portions are provided continuously or intermittently along the waist opening side edge, a third region in which the adhesive portions are provided continuously or intermittently along one side edge and at both front and rear ends, a fourth region in which the adhesive portions are provided continuously or intermittently along the other side edge and at both front and rear ends, and a central region surrounded by the first region, the second region, the third region, and the fourth region and not having the adhesive portions, a portion where the first region and the third region overlap and a portion where the first region and the fourth region overlap, There is no overlapping portion between the second region and the third region and no overlapping portion between the second region and the fourth region, the adhesive portion in the overlapping portion between the first region and the third region and the overlapping portion between the first region and the fourth region is a first adhesive portion to which the hot melt adhesive is applied with a first basis weight; the adhesive portion in the second region is a second adhesive portion to which the hot melt adhesive is applied at a second basis weight that is less than the first basis weight, the adhesive portion in a portion of the third region that does not overlap with the first region is a third adhesive portion to which the hot melt adhesive is applied at a third basis weight that is less than the first basis weight, the adhesive portion in a portion of the fourth region that does not overlap with the first region is a fourth adhesive portion to which the hot melt adhesive is applied at a fourth basis weight that is less than the first basis weight, The adhesive portion in a portion of the first region that does not overlap with the third region and the fourth region is a fifth adhesive portion to which the hot melt adhesive is applied at a fifth basis weight that is equal to or less than the first basis weight. A pants-type disposable wearing article characterized by:

[0008] (Action and effect) The pants-type disposable wearing article is characterized by the following: adhesive sections are provided only in the peripheral regions (first to fourth regions) of at least one of the front overlap region and the back overlap region, with no adhesive section provided in the central region; and the basis weight of the hot melt adhesive in the overlapping portions of the peripheral regions where the first region and the third region and the first region and the fourth region are overlapping is greater than the basis weight of the hot melt adhesive in the other adhesive sections. In other words, by not providing adhesive sections in the central region of the overlap region, a large area is secured where texture deterioration due to adhesion is not caused, and deterioration of texture can be suppressed. However, simply providing adhesive sections alone may result in a decrease in adhesive strength due to a decrease in the adhesive area. Therefore, in this pants-type disposable wearable article, the basis weight of the hot melt adhesive in the areas where the greatest force is applied when worn, i.e., the area where the first area overlaps with the third area and the area where the first area overlaps with the fourth area, is made greater than the basis weight of the hot melt adhesive in the adhesive joints in other areas, thereby ensuring the adhesive strength of the inner body while suppressing deterioration of the texture caused by adhesion in at least one of the front outer body and the rear outer body.

[0009] <Second aspect> The first basis weight is 20 to 40 g / m 2 wherein the second basis weight, the third basis weight, the fourth basis weight, and the fifth basis weight are 0.2 to 0.8 times the first basis weight. A pants-type disposable wearing article according to a first embodiment.

[0010] (Action and effect) The basis weight of each adhesive portion can be determined as appropriate, but it is particularly preferable if it is within the range of this embodiment.

[0011] <Third aspect> The lower edge of the front exterior body and the lower edge of the rear exterior body have a notch recessed toward the waist opening at a portion adjacent to the side of the first adhesive portion. A pants-type disposable wearing article according to the first or second aspect.

[0012] (Action and effect) By having such a cutout portion, the force applied by the back and forth movement of the wearer's legs is not concentrated at the corners of the lower ends of the side edges of the first adhesive portion, the third adhesive portion, and the fourth adhesive portion, but is more likely to be dispersed over the entire side edges of the third adhesive portion and the fourth adhesive portion, making it less likely that the inner body will peel off from the outer body.

[0013] <Fourth aspect> At least one of the front exterior body and the rear exterior body has an exterior central portion located in the central region and having an exterior elastic member, and the exterior central portion is elastically stretchable between a natural length state in which it is contracted in the width direction together with the exterior elastic member and an expanded state in which it is stretched in the width direction together with the exterior elastic member to a maximum stretch rate of 120 to 180%, The inner body does not have an elastic member that stretches in the width direction in a portion facing the outer central portion having the elastic member. The pants-type disposable wearing article according to any one of the first to third aspects.

[0014] (Action and effect) In this embodiment, the outer body shrinks in the width direction in the central region having no adhesive portion, causing the inner body to rise from the outer body, forming a ventilation gap and allowing the surface of the inner body to adhere more closely to the wearer's skin, thereby improving the breathability and fit of the pants-type disposable wearing article of this embodiment.

[0015] <Fifth aspect> The inner body includes an absorbent body, a liquid-permeable top sheet disposed on the front side of the absorbent body, a liquid-impermeable sheet disposed on the back side of the absorbent body, and a cover nonwoven fabric covering the back surface of the liquid-impermeable sheet, the cover nonwoven fabric and the liquid-impermeable sheet are bonded together via a hot melt adhesive in a pattern in which cover adhesive portions that are continuous in the front-rear direction and cover non-adhesive portions that are continuous in the front-rear direction are alternately repeated in the width direction, the liquid-impermeable sheet, the cover nonwoven fabric, and the cover non-adhesive portion extend in the front-to-rear direction from between the front overlapping region and the rear overlapping region to the central region; A pants-type disposable wearing article according to a fourth aspect.

[0016] (Action and effect) In this embodiment, the non-adhesive portion of the cover is continuous across both the front and rear of the second adhesive portion, and therefore the gap formed by the non-adhesive portion of the cover between the liquid-impermeable sheet and the cover nonwoven fabric improves breathability in the front-to-rear direction.

[0017] <Sixth aspect> the front exterior body and the rear exterior body each have a trunk region defined as a region between one of the side seals and the other of the side seals, the rear exterior body has a buttocks cover portion extending below the torso region so that the dimension in the front-to-rear direction increases toward the center in the width direction, The lower edge of the front exterior body is the lower edge of the trunk region, the lower edge of the rear exterior body is the lower edge of the buttocks cover portion, The inner body has rising gathers on both sides in the width direction thereof, the rising gathers extending over the entire front-to-rear direction of the inner body, The rising gathers have a main body portion extending from a position along the side edge of the absorbent body in the inner body to the front side of the inner body, a front fallen portion formed by fixing a front end of the main body portion to the surface of the inner body in a fallen state, a rear fallen portion formed by fixing a rear end of the main body portion to the surface of the inner body in a fallen state, an unfixed rising portion located between the front fallen portion and the rear fallen portion, and a gathered elastic member provided along the front-to-rear direction at least at the tip of the rising portion, At least the rearward-falling portion is located only within the low-rigidity region, the rear exterior body has the first region, the second region, the third region, the fourth region, and the central region, In a natural length state, the region of the rear body having the inner body is bent so as to form a valley fold when viewed from the outside at the boundary between the low-rigidity region and the rear edge of the absorbent body, and is bent so as to form a mountain fold when viewed from the outside at a position spaced forward from the boundary between the low-rigidity region and the rear edge of the absorbent body and midway in the front-to-rear direction of the central region, The longitudinal shrinkage ratio of the buttocks cover portion in a natural length state is 0.4 to 0.7 times. The pants-type disposable wearing article according to any one of the first to fourth aspects.

[0018] (Action and effect) When worn, the buttocks-covering portion contracts upward more than before, so it is less likely to get in the way when putting the legs through the leg openings. Furthermore, since the folding of the back body is almost completely eliminated while worn, a small amount remains, so the area between the valley fold and the mountain fold floats off the wearer's skin, creating an advantage of forming a gap for storing excrement. In particular, since the mountain fold is formed midway in the front-to-rear direction in the central region that has no adhesive, the resistance to the mountain fold is reduced, making the vertical contraction of the buttocks-covering portion in its natural length even more preferable. [Effects of the Invention]

[0019] According to the present invention, it is possible to prevent deterioration of texture due to adhesion while ensuring the adhesive strength of the interior body in at least one of the front exterior body and the rear exterior body. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a plan view (inner surface side) of a pants-type disposable diaper in an unfolded state. [Figure 2] 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Figure 3] 1 is a plan view (inner surface side) showing a main part of a pants-type disposable diaper in an unfolded state. [Figure 4] FIG. 1 is a cross-sectional view taken along line 1-1 of FIG. [Figure 5] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Figure 6] 3 is a cross-sectional view of FIG. 1 taken along line 3-3. [Figure 7] FIG. 2 is a plan view of the pants-type disposable diaper in an unfolded state showing various regions. [Figure 8] FIG. [Figure 9] FIG. 2 is an enlarged plan view (inner surface side) showing a main part of the front body in an unfolded state. [Figure 10] FIG. 2 is an enlarged plan view (inner side) showing a main part of the back body in an unfolded state. [Figure 11] 1 is a perspective view showing the front of a pants-type disposable diaper in a worn state. [Figure 12] FIG. 1 is a perspective view showing the rear surface of a pants-type disposable diaper in a worn state. [Figure 13] FIG. 1 is a front view of a pants-type disposable diaper in a natural length state. [Figure 14] FIG. 2 is a rear view of the pants-type disposable diaper in a natural length state. [Figure 15] 1A is a longitudinal cross-sectional view showing a pants-type disposable diaper in a state where the diaper is in an unfolded state; FIG. 1B is a longitudinal cross-sectional view showing a pants-type disposable diaper in a state where the diaper is in a natural length; [Figure 16] FIG. 3 is a cross-sectional view taken along the width direction showing the central region and both sides thereof in a contracted state. [Figure 17] 10 is a schematic view of an inner body showing a modified example of an adhesive portion. FIG. [Figure 18] 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Figure 19] 4 is a cross-sectional view taken along the width direction showing the first region and both sides thereof in a contracted state. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] An example of a pants-type disposable diaper will be described in detail below with reference to the accompanying drawings. The dotted areas in the cross-sectional view represent the hot melt adhesive HM used to join the various components located on the front and back sides of the diaper. The hot melt adhesive can be applied by solid, bead, curtain, summit, or spiral application, or by pattern coating (transferring the hot melt adhesive using a relief printing method). Alternatively, or in addition, the fixed portions of the elastic members can be applied to the outer periphery of the elastic members using a comb gun or SureWrap application. Hot melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, and polyester / polyamide-based adhesives, but no particular limitation is imposed on the type. Heat sealing, ultrasonic sealing, or other material welding methods can also be used to join the various components.

[0022] 1 to 14 show an example of a pants-type disposable diaper. This pants-type disposable diaper includes a front exterior body 12F having a torso region T of a front body F, a rear exterior body 12B having a torso region T of a back body B, and an inner body 200 extending from a middle portion of the front exterior body 12F in the width direction WD, through the crotch region, to a middle portion of the rear exterior body 12B in the width direction WD. Side seals 12A are formed by joining both sides of the front exterior body 12F and both sides of the rear exterior body 12B, whereby an opening formed by the front and rear ends of the exterior bodies 12F, 12B serves as a waist opening WO through which the wearer's torso passes, and portions on both sides of the inner body 200 in the width direction, surrounded by the crotch-side edges 14 of the exterior bodies 12F, 12B and the side edges of the inner body 200, respectively, serve as a pair of left and right leg openings LO through which the wearer's legs pass. The inner body 200 absorbs and retains urine and other excrement, while the outer bodies 12F and 12B support the inner body 200 against the wearer's body. The front overlapping region where the inner body 200 overlaps with the front outer body 12F and the rear overlapping region where the inner body 200 overlaps with the rear outer body 12B are provided with adhesive joints made of hot melt adhesive, and these adhesive joints secure the inner body 200 to the outer bodies 12F and 12B. The front body F refers to the entire area of ​​the diaper anterior to the center in the front-to-back direction LD, and the back body B refers to the entire area posterior to the center in the front-to-back direction LD. In the drawings, the symbol Y indicates the overall length of the diaper in its unfolded state after the side seals 12A have been peeled off (the length in the front-to-back direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the overall width of the diaper in its unfolded state.

[0023] This pants-type disposable diaper has a torso region T, which is defined as the front-to-back range containing the side seals 12A (the front-to-back range from the waist opening WO to the tops of the leg openings LO), and an intermediate region L, which is defined as the front-to-back range of the portion forming the leg openings LO (between the front-to-back region containing the side seals 12A of the front body F and the front-to-back region containing the side seals 12A of the back body B). The exterior bodies 12F, 12B have a torso region E, which is defined as the region between one side seal 12A and the other side seal 12A. The torso region E can be conceptually divided into a waist region W, which forms the edge of the waist opening WO, and a lower waist region U, which is the portion below this. Typically, if the torso region E has a boundary where the stretch stress in the width direction WD changes (e.g., where the thickness or maximum elongation rate of the elastic member changes), the waist region W is the portion closer to the waist opening WO than the boundary closest to the waist opening WO. If no such boundary exists, the waist region W is the portion located closer to the waist opening WO than the boundary that passes through the edge of the absorbent body 56 or the inner body 200 on the waist opening WO side and extends linearly in the width direction. The length of these portions in the front-to-back direction LD varies depending on the size of the product and can be determined as appropriate. For example, the waist region W can be 20 to 40 mm, and the lower waist region U can be 150 to 220 mm. Meanwhile, both side edges of the middle region L are narrowed to fit around the wearer's legs, and these are the areas into which the wearer's legs are inserted. As a result, the pants-type disposable diaper in its unfolded state has a generally hourglass shape as a whole.

[0024] (exterior body) The exterior bodies 12F, 12B in the illustrated example are made up of a rectangular front exterior body 12F having a torso region T of the front body F and a rear exterior body 12B having a torso region T of the back body B, and the front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side but are spaced apart in the front-to-back direction LD (two-piece exterior type). This separation distance 12d in the front-to-back direction LD can be, for example, about 30 to 60% of the total length Y. In the illustrated example, the crotch side edge of the front outer body 12F is straight along the width direction WD, and the crotch side edge 14 of the rear outer body 12B is curved and extends toward the crotch side as it moves toward the center in the width direction WD, but appropriate modifications are possible, such as the edges 14 of both the front outer body 12F and the rear outer body 12B being straight along the width direction WD (the front and rear outer bodies 12F and 12B have the same front-to-back direction LD dimensions), or the crotch side edges 14 of both the front outer body 12F and the rear outer body 12B being curved and extending toward the crotch side as it moves toward the center in the width direction WD.

[0025] Only the two side edges (both edges in the width direction WD) of the exterior bodies 12F, 12B in the range corresponding to the torso region T are joined to form side seals 12A, thereby forming a ring-shaped waist portion with a waist opening WO. Therefore, in the illustrated example, the rear exterior body 12B is formed with a buttocks-covering portion C extending downward from the torso region E (toward the middle region L), while the front exterior body 12F does not have a portion located in the middle region L. Although not shown, the front exterior body 12F may also be provided with a groin-covering portion extending downward from the torso region E.

[0026] As shown in Figures 1, 2, 4, and 6, the exterior bodies 12F and 12B have an inner sheet layer 12H and an outer sheet layer 12S, with elastic members 15-17 provided between them. Each sheet layer can be made of a single sheet material or individual sheet materials. In the illustrated example, the exterior bodies 12F and 12B have a pressing sheet 20A and a back sheet 20B. In the lower waist region U, the inner sheet layer 12H is formed by the pressing sheet 20A, and the outer sheet layer 12S is formed by the back sheet 20B. In the waist region W, the inner sheet layer 12H and the outer sheet layer 12S are formed by the inner and outer portions, respectively, of the back sheet 20B folded back at the edge of the waist opening WO. The pressure sheet 20A in the illustrated example may be omitted, and the folded portion 20C of the back sheet 20B in the figure may be extended toward the crotch side, with all of the elastic members 15 to 17 sandwiched between the sheets of the folded portion 20C, or all of the elastic members 15 to 17 may be sandwiched between the pressure sheet 20A and the back sheet 20B regardless of whether or not the folded portion 20C is provided.

[0027] In the illustrated example, an innermost sheet layer 12C made of nonwoven fabric or the like is attached so as to cover the inside of the folded-back portion 20C of the backsheet 20B and the pressing sheet 20A, and this innermost sheet layer 12C extends to a position where it overlaps with the end of the inner body 200 on the waist opening WO side. Although not shown, the innermost sheet layer 12C can be omitted. Alternatively, the innermost sheet layer 12C may be omitted and the folded-back portion 20C of the backsheet 20B may be extended to a position where it overlaps with the end of the inner body 200 on the waist opening WO side to serve as the innermost sheet layer.

[0028] It is preferable that exterior bodies 12F, 12B have elastic members 15-17 built in, thereby forming a stretchable region (a region having elastic members 15-17) that stretches and contracts in the width direction WD in conjunction with the stretching of elastic members 15-17. This stretchable region is intended to improve fit to the wearer's body surface, and is preferably provided over the entire front and rear exterior bodies 12F and 12B in the front-to-back direction LD, although some regions, such as the middle of the front-to-back direction LD, may be omitted. When in its natural length, the stretchable region contracts as elastic members 15-17 contract, forming wrinkles or creases on the inner and outer surfaces, and when stretched in the width direction WD, it can be stretched up to a predetermined maximum stretch rate without wrinkles. In such an elastic structure, if the inner sheet layer 12H and the outer sheet layer 12S are free from each other, one sheet layer may partially or entirely float relative to the other sheet layer, causing unnecessary folds or bulges, which may lead to poor fit or slippage when worn. Therefore, it is preferable that the inner sheet layer 12H and the outer sheet layer 12S are directly or indirectly bonded over almost their entire length.

[0029] As the elastic members 15 to 17, in addition to elongated elastic members such as rubber threads (illustrated example), known elastic members such as strip-shaped, net-shaped, film-shaped, etc. can be used without any particular limitation. As the elastic members 15 to 17, synthetic rubber such as spandex or natural rubber may be used.

[0030] An adhesive such as a hot-melt adhesive is preferably used as a means for fixing the elastic members 15-17 to the inner sheet layer 12H and the outer sheet layer 12S. The inner sheet layer 12H and the outer sheet layer 12S can be joined using a hot-melt adhesive. Alternatively, to reduce the amount of hot-melt adhesive used, the inner sheet layer 12H and the outer sheet layer 12S can be welded together by ultrasonic welding, heat sealing, or the like. For example, when the elastic members 15-17 are elongated elastic members 15-17 such as rubber thread, joining the inner sheet layer 12H and the outer sheet layer 12S with a hot-melt adhesive at the position where the elastic members 15-17 pass can be achieved, thereby both joining the inner sheet layer 12H and the outer sheet layer 12S and fixing the elastic members 15-17 to the inner sheet layer 12H and the outer sheet layer 12S. In this case, to reinforce the fixation of the elastic members 15-17, additional hot melt adhesive can be applied only to predetermined regions including both end portions of the elastic members 15-17. Alternatively, only predetermined regions including both end portions of the elastic members 15-17 can be fixed to the inner sheet layer 12H and the outer sheet layer 12S with hot melt adhesive, and the inner sheet layer 12H and the outer sheet layer 12S can be joined by ultrasonic welding or other welding means at locations other than the positions where the elastic members 15-17 pass. Alternatively, without using hot melt adhesive, the inner sheet layer 12H and the outer sheet layer 12S can be joined by ultrasonic welding or other welding means at positions adjacent to the elastic members 15-17 in the front-to-back direction, and the elastic members 15-17 can be sandwiched at the joint. Furthermore, the inner sheet layer 12H and the outer sheet layer 12S can be joined by ultrasonic welding or other welding means along the longitudinal direction of the elastic members 15-17. When the elastic members 15-17 are elastic sheets such as elastic films, the inner sheet layer 12H and the outer sheet layer 12S can be joined directly or indirectly via the elastic sheet at multiple joining portions arranged at intervals. A direct joining portion is one in which through-holes are formed in the elastic sheet in the thickness direction, and the inner sheet layer 12H and the outer sheet layer 12S are joined only within the through-holes, while an indirect joining portion is one in which the elastic sheet does not have through-holes, and the inner sheet layer 12H and the outer sheet layer 12S are joined via the elastic sheet.

[0031] Nonwoven fabrics are suitable for the constituent sheets of the exterior bodies 12F, 12B (in the illustrated example, the aforementioned back sheet 20B, pressing sheet 20A, etc.) from the viewpoint of breathability and texture, but any material can be used as long as it can be welded at the side seal 12A. For example, instead of or together with the nonwoven fabric, other materials, such as thermoplastic resin sheets such as elastic films, can also be used. When using nonwoven fabric, it is recommended to use a material with a fineness of 1 to 3 dtex and a basis weight of 10 to 25 g / m. 2 Although a spunbond nonwoven fabric of this order is preferred, short fiber nonwoven fabric can also be used for some or all of the layers. Furthermore, the constituent sheets of the exterior bodies 12F, 12B can be ordinary nonwoven fabrics that have almost no elastic stretch (maximum stretch rate in the width direction WD of less than 110%), or sheets that have a certain degree of stretchability (maximum stretch rate in the width direction WD of 200% or more), such as stretchable nonwoven fabrics made of elastomeric fibers or elastic films.

[0032] To explain the elastic members 15-17 in the illustrated example in more detail, a plurality of waist elastic members 15 made of elongated elastic members are attached to the waist region W of the outer bodies 12F, 12B at intervals in the front-to-back direction LD so as to be continuous throughout the width direction WD. One or more of the waist elastic members 15 arranged in the region adjacent to the lower waist region U may overlap the inner body 200, or may be provided on both sides of the region in the width direction WD except for the central region in the width direction that overlaps with the inner body 200. These waist elastic members 15 are preferably made of approximately 5 to 10 rubber threads having a thickness of approximately 620 to 1240 dtex, spaced apart from each other by approximately 4 to 8 mm, and the maximum elongation of the waist region W in the width direction WD is preferably approximately 260 to 320%.

[0033] Additionally, multiple lower-waist elastic members 16, each consisting of an elongated elastic member, are attached at intervals in the front-to-back direction LD to the lower-waist portion U of the exterior bodies 12F, 12B. The lower-waist elastic members 16 are preferably 12 to 18 strands of rubber thread having a thickness of approximately 310 to 940 dtex, arranged at intervals of approximately 8 to 16 mm, and the maximum elongation rate of the lower-waist portion U in the width direction WD is preferably approximately 200 to 280%.

[0034] Furthermore, when a buttocks-covering portion C is provided on the rear exterior body 12B as in the illustrated example, a cover elastic member 17 can be provided, which allows the maximum elongation rate of the buttocks-covering portion C in the width direction WD to be 200 to 280%, particularly 200 to 240%. Although not shown, a similar cover elastic member can also be provided when a groin-covering portion is provided on the front exterior body 12F.

[0035] The waist elastic member 15, the lower-waist elastic member 16, and the cover elastic member 17 are elastically stretchable in the direction along these elastic members. In addition to these elastic members that stretch widthwise, elastic members arranged in a curved line, such as along the leg circumference, may also be provided, but this is not required as in the illustrated example. The maximum stretch rate of each portion can be adjusted by the thickness, number, spacing, and elongation rate at the time of attachment of the elastic members 15-17. In particular, the thickness, number, and spacing of the elastic members 15-17 are preferably selected so that the maximum stretch rate of a specific portion of the outer body 12F, 12B is approximately equal to the elongation rate at the time of attachment of the elastic members 15-17 that contract that specific portion when the inner body 200 is not fastened or removed (for example, 80% or more, more preferably 90% or more of the elongation rate at the time of attachment).

[0036] When the elastic members 16, 17 are provided in the range of the absorbent body 56 in the front-to-back direction LD, as in the lower waist portion U and buttocks-covering portion C in the illustrated example, at least one of the lower waist portion U and buttocks-covering portion C in at least one of the front body F and back body B may have a non-stretchable region in the middle in the width direction WD and stretchable regions on both sides. This improves fit in a specific area. The range of the non-stretchable region in the width direction WD can be determined as appropriate, but the side edges of the non-stretchable region may be located only toward the center in the width direction WD relative to the side edges of the absorbent body 56, or may be located between the side edges of the absorbent body 56 and the side edges of the inner body 200, or may be located between the side edges of the inner body 200 and the side seals 12A. The non-stretchable region preferably includes the entire interior fastening portion 201 (the portion located in the first to fourth regions 21 to 24 and the central region 25, described below). When a non-stretchable region is provided in the lower waist portion U, the non-stretchable region may be provided in only a portion in the front-to-back direction LD of the lower waist portion U, or may be provided over the entirety. When a non-stretchable region is provided in the buttocks-covering portion C, the non-stretchable region may be provided in only a portion in the front-to-back direction LD of the buttocks-covering portion C, or may be provided over the entirety. Of course, at least one of the lower waist portion U and the buttocks-covering portion C in at least one of the front body F and the back body B may not have a non-stretchable region, and the elastic members 16, 17 may be continuous across the inner body 200.

[0037] The non-stretchable region is a region that does not have elastic members 16, 17 or that has eliminated or reduced stretchability due to the elastic members 16, 17, and has a maximum elongation rate of 110% or less. The non-stretchable region can be formed by known methods. It is preferable that the maximum elongation rate of the non-stretchable region is 100%. Generally, when elongated elastic members 15-17 are used as the elastic members 15-17 in the body region E, there are roughly two methods for eliminating or reducing stretchability, either of which can be adopted. Specifically, the first method involves fixing the elastic members 15-17 to the inner sheet layer 12H and the outer sheet layer 12S continuously or intermittently in the width direction WD, and then heating the non-stretchable region or cutting the elastic members 16, 17 into small pieces in a predetermined cutting pattern using a cutting blade, thereby reducing the maximum elongation rate in the width direction WD in the non-stretchable region and making the area other than the non-stretchable region into a stretchable region. In this case, many small pieces of the elastic members 16, 17 remain between the inner sheet layer 12H and the outer sheet layer 12S in a state where they have shrunk to a certain extent. In the second method, the elastic members 16, 17 are left unsecured (or may be weakly secured with a hot melt adhesive) to the inner sheet layer 12H and the outer sheet layer 12S only in the non-stretchable region, and the unsecured portion is cut at a single location in the middle of the width direction WD and allowed to shrink to or near its natural length without being attached to the inner sheet layer 12H or the outer sheet layer 12S, thereby reducing the maximum extensibility in the width direction WD in the non-stretchable region and making the region other than the non-stretchable region into a stretchable region. The second method has the advantage of fewer cut locations compared to the first method.

[0038] When an elastic sheet such as an elastic film is used as the elastic member 17 in the trunk region E, although not shown, a continuous elastic sheet is interposed between the inner sheet layer 12H and the outer sheet layer 12S in the width direction WD, and the inner sheet layer 12H and the outer sheet layer 12S are joined via the elastic sheet at multiple spaced-apart joints, and the number of joints per unit area in the non-stretched region is increased, thereby reducing the maximum extensibility in the width direction WD in the non-stretched region and making the region other than the non-stretched region the stretchable region. Furthermore, when the inner sheet layer 12H and the outer sheet layer 12S are directly joined at multiple spaced-apart joints via through-holes that penetrate the elastic sheet in the thickness direction, arranging the joints so that the non-stretched region does not have a linearly continuous elastic sheet along the width direction WD can reduce the maximum extensibility in the width direction WD in the non-stretched region and make the region other than the non-stretched region the stretchable region.

[0039] (Adhesive part) As shown in Figures 3, 4, 9 and 10, adhesive joints b1 to b5 made of hot melt adhesive HM are provided in the front overlap region 81 where the inner body 200 and the front outer body 12F overlap, and in the rear overlap region 82 where the inner body 200 and the rear outer body 12B overlap, and these adhesive joints b1 to b5 fix the inner body 200 to the outer bodies 12F and 12B. Characteristically, the front overlapping region 81 and the back overlapping region 82 in the example shown in Figure 3 have a first region 21 in which adhesive portions b1, b5 are provided continuously or intermittently along the crotch side edge to both ends in the width direction WD, a second region 22 in which adhesive portion b2 is provided continuously or intermittently along the waist opening WO side edge, a third region 23 in which adhesive portion b3 is provided continuously or intermittently along one side edge to both ends in the front-to-back direction LD, a fourth region 24 in which adhesive portion b4 is provided continuously or intermittently along the other side edge to both ends in the front-to-back direction LD, and a central region 25 which has no adhesive portions and is surrounded by the first to fourth regions 21 to 24 (i.e., adjacent to all of the first to fourth regions 21 to 24). Furthermore, although there are overlapping portions between the first region 21 and the third region 23 and between the first region 21 and the fourth region 24, there are no overlapping portions between the second region 22 and the third region 23 and between the second region 22 and the fourth region 24.

[0040] Based on such an arrangement of the adhesive portions b1 to b5, the adhesive portion b1 in the overlapping portion between the first region 21 and the third region 23 and the overlapping portion between the first region 21 and the fourth region 24 is a first adhesive portion b1 to which the hot melt adhesives HM1 and HM2 are applied at a first basis weight, the adhesive portion b2 in the second region 22 is a second adhesive portion b2 to which the hot melt adhesive HM2 is applied at a second basis weight that is less than the first basis weight, and the adhesive portion b3 in the portion of the third region 23 that does not overlap with the first region 21 is a first adhesive portion b1 to which the hot melt adhesives HM1 and HM2 are applied at a second basis weight that is less than the first basis weight. It is preferable that the third adhesive portion b3 is one in which the hot melt adhesive HM2 is applied at a third basis weight that is less than the basis weight, the adhesive portion b4 in the part of the fourth region 24 that does not overlap with the first region 21 is one in which the hot melt adhesive HM2 is applied at a fourth basis weight that is less than the first basis weight, and the adhesive portion b5 in the part of the first region 21 that does not overlap with the third region 23 and the fourth region 24 is one in which the hot melt adhesive HM1 is applied at a fifth basis weight that is less than the first basis weight.

[0041] In the pants-type disposable wearing article, by not providing an adhesive portion in the central region 25 of the front overlapping region 81 and the rear overlapping region 82, a large region is secured where deterioration in texture due to adhesion does not occur, thereby suppressing deterioration in texture. In the pants-type disposable wearing article, the basis weight of the hot melt adhesives HM1, HM2 in the regions where the greatest force is applied when worn, i.e., the region where the first region 21 overlaps with the third region 23 and the region where the first region 21 overlaps with the fourth region 24, is made greater than the basis weight of the hot melt adhesives HM1, HM2 in the adhesive portions b2 to b5 in other regions, thereby suppressing deterioration in texture due to adhesion while ensuring the adhesive strength of the inner body 200 in at least one of the front outer body 12F and the rear outer body 12B.

[0042] The basis weight of each of the adhesive portions b1 to b5 may be determined as appropriate. For example, the first basis weight may be set to 20 to 40 g / m 2 and the second, third, fourth and fifth basis weights are preferably 0.2 to 0.8 times the first basis weight (the lower limit is more preferably 0.4 times, and the upper limit is more preferably 0.6 times).

[0043] The dimensions of each part, such as the first to fourth regions 21 to 24 and the central region 25, can be determined as appropriate, but are preferably within the following ranges, for example. Note that when each dimension varies depending on the position, it means the maximum value. (Front overlap area) Dimension 21x of the first region 21 in the width direction WD: 0.8 to 0.95 times the dimension 81x in the width direction WD of the front overlapping region 81 Dimension 21y of the first region 21 in the front-rear direction LD: 0.1 to 0.7 times the dimension 81y of the front overlapping region 81 in the front-to-rear direction LD Distance d1 between the first region 21 and the lower edge (edge ​​on the crotch side) of the front overlap region 81: 0~10mm Dimension 22x of the second region 22 in the width direction WD: 0.5 to 0.9 times the dimension 81x in the width direction WD of the front overlapping region 81 Dimension 22y of the second region 22 in the front-rear direction LD: 0.1 to 0.6 times the dimension 81y of the front overlapping region 81 in the front-to-rear direction LD Distance d2 between the second region 22 and the upper edge of the front overlap region 81 (edge ​​on the waist opening WO side): 0~10mm Dimension 23x of the third region 23 in the width direction WD, dimension 24x of the fourth region 24 in the width direction WD: 0.04 to 0.4 times the dimension 81x in the width direction WD of the front overlapping region 81 Dimension 23y of the third region 23 in the front-rear direction LD, dimension 24y of the fourth region 24 in the front-rear direction LD: 0.7 to 0.95 times the dimension 81y of the front overlapping region 81 in the front-to-rear direction LD Distances d3, d4 between the third region 23 and the fourth region 24 and the adjacent side edges of the front overlap region 81: 0~10mm Width direction WD dimension 25x of central area 25: 0.6 to 0.9 times the dimension 81x in the width direction WD of the front overlapping region 81 Dimension 25y of the central region 25 in the front-to-back direction LD: 0.3 to 0.8 times the dimension 81y in the front-to-rear direction LD of the front overlapping region 81

[0044] (Post-overlap area) Dimension 21x of the first region 21 in the width direction WD: 0.8 to 0.95 times the dimension 82x of the width direction WD of the rear overlap region 82 Dimension 21y of the first region 21 in the front-rear direction LD: 0.04 to 0.2 times the dimension 82y of the rear overlapping region 82 in the front-to-rear direction LD Distance d1 between the first region 21 and the lower edge (the edge on the crotch side) of the rear overlap region 82: 0~10mm Dimension 22x of the second region 22 in the width direction WD: 0.5 to 0.9 times the dimension 82x of the width direction WD of the rear overlapping region 82 Dimension 22y of the second region 22 in the front-rear direction LD: 0.04 to 0.3 times the dimension 82y of the rear overlapping region 82 in the front-to-rear direction LD Distance d2 between the second region 22 and the upper edge of the back overlap region 82 (edge ​​on the waist opening WO side): 0~10mm Dimension 23x of the third region 23 in the width direction WD, dimension 24x of the fourth region 24 in the width direction WD: 0.04 to 0.4 times the dimension 82x of the width direction WD of the rear overlapping region 82 Dimension 23y of the third region 23 in the front-rear direction LD, dimension 24y of the fourth region 24 in the front-rear direction LD: 0.7 to 0.95 times the dimension 82y of the rear overlapping region 82 in the front-to-rear direction LD Distances d3, d4 between the third region 23 and the fourth region 24 and the adjacent side edges of the rear overlap region 82: 0~10mm Width direction WD dimension 25x of central area 25: 0.6 to 0.9 times the dimension 82x of the width direction WD of the rear overlapping region 82 Dimension 25y of the central region 25 in the front-to-back direction LD: 0.6 to 0.9 times the dimension 82y of the rear overlapping region 82 in the front-to-rear direction LD

[0045] (A portion where the first region 21 and the third region 23 overlap, and a portion where the first region 21 and the fourth region 24 overlap) Dimension 26x in the width direction WD: 0.05 to 0.3 times the dimension in the width direction WD of the first region 21 Dimension 26y in the front-rear direction LD: 0.5 to 1.0 times the dimension of the first region 21 in the front-rear direction LD

[0046] Although the method for forming the adhesive portions b1 to b5 of the first to fourth regions 21 to 24 is not limited, it is preferable to apply the hot melt adhesive HM1 to the portion of the outer bodies 12F, 12B corresponding to the first region 21, apply the hot melt adhesive HM2 to the portion of the inner body 200 corresponding to the second to fourth regions, and then bond the two together, thereby doubling the hot melt adhesives HM1 and HM2 only in the portions where the first region 21 and the third region 23 overlap and where the first region 21 and the fourth region 24 overlap, because this facilitates the production of the aforementioned adhesive structure. In this case, the application pattern of the hot melt adhesive HM1 on the outer bodies 12F, 12B and the application pattern of the hot melt adhesive HM2 on the inner body 200 may be the same or different. Furthermore, the basis weight of the hot melt adhesive HM1 on the outer bodies 12F, 12B and the basis weight of the hot melt adhesive HM2 on the inner body 200 may be the same, or one may be greater than the other. For example, the basis weight of the hot melt adhesive HM1 on the exterior bodies 12F and 12B is 10 to 20 g / m 2 The basis weight of the hot melt adhesive HM2 applied to the inner body 200 can be set to 0.3 to 1.0 times the basis weight of the hot melt adhesive HM1 applied to the outer bodies 12F, 12B.

[0047] In the illustrated example, both side edges of the first region 21 are located closer to the center in the width direction WD than the side edges of the third region 23 and the fourth region 24, but at least one side edge of the first region 21 may be located outward in the width direction WD than the side edges of the third region 23 and the fourth region 24, or both side edges of the first region 21 may coincide with the side edges of the third region 23 and the fourth region 24, respectively. Also, in the illustrated example, the crotch side edge of the third region 23 and the crotch side edge of the fourth region 24 are located between the crotch side edge of the first region 21 and the edge on the waist opening WO side, but they may be located closer to the crotch than the crotch side edge of the first region 21, or may coincide with the crotch side edge of the first region 21.

[0048] In the example shown in Figure 3, both the front overlapping region 81 and the rear overlapping region 82 each have the first to fourth regions 21 to 24 and the central region 25, but as shown in Figure 17(a), the front overlapping region 81 has the first to fourth regions 21 to 24 and the central region 25, but the rear overlapping region 82 does not have the non-adhesive central region 25, and the known adhesive portion b6 may be provided over almost the entire region, or conversely, as shown in Figure 17(b), the rear overlapping region 82 has the first to fourth regions 21 to 24 and the central region 25, but the front overlapping region 81 does not have the non-adhesive central region 25, and the known adhesive portion b6 may be provided over almost the entire region.

[0049] 18, it is preferable that the lower edges of the front exterior body 12F and the rear exterior body 12B have cutouts 12X recessed toward the waist opening WO at portions adjacent to the sides of the first adhesive portion b1. This makes it easier for the force applied by the forward and backward movement of the wearer's legs to be dispersed over the entire side edges of the third adhesive portion b3 and the fourth adhesive portion b4 rather than being concentrated at the corners of the lower ends of the side edges of the first adhesive portion b1, the third adhesive portion b3, and the fourth adhesive portion b4, making it less likely that the interior body 200 will peel off from the exterior bodies 12F, 12B.

[0050] The shape of the edge of the cutout 12X may be determined as appropriate, but a rounded shape, such as a curved, arc-shaped corner, is preferred over a sharply angled shape. The cutout 12X may have linear portions, but preferably does not. The dimensions of the cutout 12X may be determined as appropriate. For example, the dimension of the cutout 12X in the front-to-rear direction LD may be 0.5 to 1.0 times the dimension 26y in the front-to-rear direction LD of the portion where the first region 21 and the third region 23 overlap and the dimension 26y in the front-to-rear direction LD of the portion where the first region 21 and the fourth region 24 overlap. Additionally or independently, the dimension of the width direction WD of the cutout 12X may be 0.3 to 1.0 times the dimension 26x in the width direction WD of the portion where the first region 21 and the third region 23 overlap and the dimension 26x in the width direction WD of the portion where the first region 21 and the fourth region 24 overlap.

[0051] 1 to 10, the central portion of the exterior located in the central region 25 is elastically stretchable between a natural length state in which it is contracted in the width direction WD together with the exterior elastic members (in the illustrated example, the lower-waist elastic member 16 and the cover elastic member 17) and an expanded state in which it is stretched in the width direction WD to a maximum elongation rate of 120 to 180% (the lower limit is more preferably 140%, and the upper limit is more preferably 160%) together with the exterior elastic members. If the inner body 200 does not have an elastic member that stretches in the width direction WD in the portion facing the central portion of the exterior, as shown in FIG. 16(a), the front outer body 12F and the rear outer body 12B will contract in the width direction WD in the central region 25 that does not have the adhesive portions b1 to b5, causing the inner body 200 to float from the front outer body 12F and the rear outer body 12B, forming a ventilation gap SP1 and making it easier for the surface of the inner body 200 to adhere to the wearer's skin, which is preferable. 17(c), it is particularly preferable that the adhesive portions b2 of the second region 22 of the rear overlapping region 82 are provided on both sides in the width direction WD and that there is a non-adhesive portion in the center in the width direction WD, since this improves the fit to the buttocks. Also, unlike the illustrated example, only one of the front exterior body 12F and the rear exterior body 12B may have such a structure.

[0052] (Favorable stretch characteristics of the exterior body) The exterior bodies 12F, 12B of the example shown in FIG. 1 etc. can be divided into several regions as shown in FIG. 7. That is, the lower waist portion U of the exterior bodies 12F, 12B of the illustrated example can be divided into an upper region U1 above a boundary line BL that passes through the edge of the waist opening WO side of the absorbent body 56 and extends in the width direction WD, and a lower region U2 below the boundary line BL. The lower region U2 also has a first central region M1 that overlaps with the interior fastening part 201, a first side region S1 defined as the region between one side seal 12A and the first central region M1, and a second side region S2 defined as the region between the other side seal 12A and the first central region M1. (a) The first side region S1 and the second side region S2 in the front body F, and the first side region S1 and the second side region S2 in the back body B are stretchable regions that stretch between a natural length state in which they are contracted in the width direction WD together with the waist-lower elastic member 16 and an expanded state in which they are stretched in the width direction WD to a maximum stretch rate of 150 to 300% (more preferably 200 to 250%) together with the waist-lower elastic member 16, (b) The first central region M1 in the back body B is a non-elastic region having a maximum extensibility in the width direction WD of 110% or less, and the first central region M1 in the front body F is an elastic region that elastically stretches between a natural length state in which it is contracted in the width direction WD together with the lower waist elastic member 16 and an expanded state in which it is stretched in the width direction WD together with the lower waist elastic member 16 to a maximum extensibility of 0.7 to 1 times (more preferably 0.8 to 0.9 times) the first side region S1 and the second side region S2 in the front body F, (c) As shown in Figures 13 and 14, in the natural length state, the inner body 200 has the maximum width portion in the lower region U2 of the back body B, and the width 210 of the inner body 200 in the lower region U2 of the front body F is 0.5 to 0.9 times (more preferably 0.6 to 0.8 times) the maximum width 220 of the inner body 200. This is preferable.

[0053] The maximum elongation rate of a specific portion of the outer casing 12F, 12B can be determined as the elongation rate at the elastic limit (at 1 N when the elastic limit cannot be clearly determined) by cutting out a test piece consisting of the specific portion of the outer casing 12F, 12B and the gripping portions adjacent to it on both sides in the width direction WD, and then gripping the gripping portions of this test piece with the gripping tools of a tensile testing machine and performing a tensile test.

[0054] The dimensions of specific parts of the exterior bodies 12F, 12B are apparent dimensions, and when measuring the product, they are measured using a ruler after releasing the front body F and back body B at the side seal 12A. When measuring dimensions in the natural length state, place the product on a horizontal surface such as a test bench so that at least the part to be measured (back body B when measuring back body B) is exposed on the top surface in as flat a state as possible, and measure the dimensions by placing a ruler on the part to be measured without applying force to it.

[0055] The width 210 of the inner body 200 refers to the length of a line segment connecting two points, one on one side edge of the inner body 200 and the other on the other side edge of the inner body 200, that are at the same position in the front-to-back direction LD in the unfolded state (i.e., are the same distance from the front or rear end of the inner body 200). The width 210 of the inner body 200 varies depending on the position in the front-to-back direction LD of the inner body 200 (this includes not only cases where the entire front-to-back direction LD changes continuously, but also cases where the inner body has both constant and variable portions). Therefore, the width 210 of the inner body 200 in a specific region that has such a change (for example, the lower region U2) refers to the minimum value within that region.

[0056] As described above, the entire lower region U2 of the outer bodies 12F, 12B of the front body F in the width direction WD is made a stretchable region, while the first central region M1 of the lower region U2 of the outer bodies 12F, 12B of the back body B is made a non-stretchable region. As a result, in the natural length state, the maximum width 210 of the inner body 200 is located in the lower region U2 of the back body B, and the width 210 of the inner body 200 in the lower region U2 of the front body F is 0.5 to 0.9 times the maximum width 210 of the inner body 200. As shown in Figs. 11 and 12, when worn, the maximum width 210 of the inner body 200 in the back body B spreads to cover the left and right bulges of the wearer's buttocks, providing a good fit. Furthermore, when the pants-type disposable wearing article is pulled up after the wearer has put their legs through it, the back body B is less likely to get caught on the bulges of the buttocks, improving ease of putting on the article. On the other hand, because the first central region M1 in the front body F is a stretchable region, the width 210 of the inner body 200 in the lower region U2 of the front body F does not widen unnecessarily, and it fits well between the wearer's groin area. Therefore, it is possible to achieve both the fit of the inner body 200 in the front body F and the fit of the inner body 200 in the back body B. Moreover, this fit can be achieved with a simple structure that involves the arrangement of stretchable and non-stretchable regions.

[0057] When the first central region M1 is a non-stretch region and the first side region S1 and second side region S2 on either side of it are stretch regions, as in the lower region U2 of the back body B, the lower region U2 can be formed by connecting assemblies with different maximum stretch rates, but from the standpoint of ease of manufacturing, it is preferable to attach elastic members (in the illustrated example, waist lower elastic member 16) continuously along the width direction WD to the outer bodies 12F, 12B as described above, and to eliminate or reduce the stretchability of the first central region M1 in part or all, making it a non-stretch region with a reduced maximum stretch rate, and to make the first side region S1 and second side region S2 stretch regions. When the first central region M1 of the front body F and the first side region S1 and second side region S2 on either side thereof are made into stretchable regions, the lower region U2 can be formed by connecting assemblies with the same or different maximum elongation rates, but from the standpoint of ease of manufacturing, it is preferable to attach the waist lower elastic member 16 continuously along the width direction WD to the outer bodies 12F, 12B to form continuous stretchable regions throughout the entire width direction WD of the first central region M1 and the first side region S1 and second side region S2 on either side thereof.

[0058] In the illustrated example, the number of lower waist elastic members 16 located in the lower region U2 can be determined as appropriate, but it is preferable to provide multiple members in each of the front body F and the back body B. For example, 2 to 10 members, and particularly 3 to 7 members, can be provided in each of the front body F and the back body B. The dimension in the front-to-back direction LD of the lower region U2 of the front body F can be the same as the dimension in the front-to-back direction LD of the lower region U2 of the back body B, or it can be shorter (for example, 0.6 to 0.8 times the dimension in the front-to-back direction LD of the lower region U2 of the back body B). In the former case, the number of lower waist elastic members 16 located in the lower region U2 of the front body F can be the same as the number of lower waist elastic members 16 located in the lower region U2 of the back body B. In the latter case, the number of lower waist elastic members 16 located in the lower region U2 of the front body F can be fewer than the number of lower waist elastic members 16 located in the lower region U2 of the back body B.

[0059] As mentioned above, the maximum width 210 of the inner body 200 in the back body B provides a good fit to the bulge of the buttocks. However, if there is no stretchable region for reducing the width 210 of the inner body 200 from there to the crotch area, there is a risk that the shape stability of the inner body 200 in the back body B will decrease. Therefore, in the case of a two-piece outer body type such as the illustrated example, it is preferable to have a buttocks-covering portion C with a maximum stretch rate approximately halfway between the lower region U2 of the front body F and the lower region U2 of the back body B.

[0060] More specifically, the buttocks cover portion C has a second central region M2 that overlaps with the interior fastening portion 201, a third side region S3 that is defined as the region between one side seal 12A and the second central region M2, and a fourth side region S4 that is defined as the region between the other side seal 12A and the second central region M2.The buttocks cover portion C is an elastic region that elastically stretches between a natural length state in which it is contracted in the width direction WD together with the cover elastic member 17, and an expanded state in which it is stretched in the width direction WD together with the cover elastic member 17 to a maximum stretch rate of 150 to 300% (more preferably 200 to 250%), and it is preferable that the maximum stretch rate of the buttocks cover portion C is smaller than the maximum stretch rate of the first central region M1 of the front body F (for example, 0.5 to 0.9 times the maximum stretch rate of the first central region M1 of the front body F). As a result, as shown in Figures 12 and 14, the width 210 of the inner body 200 in the back body B is reduced from the maximum width 210 portion of the inner body 200 to the crotch area, resulting in superior shape stability of the inner body 200 in the back body B compared to when such reduction does not occur.

[0061] When the second central region M2 and the third side region S3 and fourth side region S4 on either side thereof are made into stretchable regions, the buttocks cover portion C can be formed by connecting assemblies with the same or different maximum elongation rates, but from the standpoint of ease of manufacturing, it is preferable to attach the cover elastic member 17 continuously along the width direction WD to the outer bodies 12F, 12B to form continuous stretchable regions throughout the entire width direction WD of the second central region M2 and the third side region S3 and fourth side region S4 on either side thereof.

[0062] In the illustrated example, the number of cover elastic members 17 located on the buttocks covering portion C can be determined as appropriate, but it is preferable to provide a plurality of members, for example, 2 to 6, and particularly 3 to 5.

[0063] As will be described later, when the front end and rear end of the inner body 200 have low-rigidity regions 202 that do not have the absorbent body 56 across the entire width direction WD (regions that do not have the absorbent body 56 and therefore have lower rigidity than regions that have the absorbent body 56), the low-rigidity regions 202 can be used to improve the fit of the back body B. That is, as shown in Figures 1, 2, 7, 9, and 10, the low-rigidity regions 202 are located in an upper region U1 of the waist lower portion U, and the upper region U1 of the waist lower portion U has a third central region M3 that overlaps with the low-rigidity region 202 and the inner fastening part 201, a fifth side region S5 defined as a region between one side seal 12A and the third central region M3, and a sixth side region S6 defined as a region between the other side seal 12A and the third central region M3. In this case, the fifth side region S5 and the sixth side region S6 are stretchable regions that elastically stretch between a natural length state in which they are contracted in the width direction WD together with the waist-down elastic member 16, and an expanded state in which they are stretched in the width direction WD together with the waist-down elastic member 16 to a maximum stretch rate of 150 to 300%, and the third central region M3 is a stretchable region that elastically stretches between a natural length state in which they are contracted in the width direction WD together with the waist-down elastic member 16, and an expanded state in which they are stretched in the width direction WD together with the elastic members 15 to 17 to a maximum stretch rate of 0.8 to 1 times (more preferably 0.9 to 1 times) that of the fifth side region S5 and the sixth side region S6, and as can be seen from a comparison of Figures 12 and 14, in the natural length state, it is preferable that the width 210 of the inner body 200 decreases from the portion of the inner body 200 with the maximum width 210 toward the rear of the inner body 200.

[0064] In this way, the third central region M3 adjacent to the first central region M1 is a stretchable region, and the width 210 of the inner body 200 decreases from the portion of maximum width 210 of the inner body 200 toward the rear of the inner body 200, so that when worn, the portion of the rear body B behind the portion of maximum width 210 of the inner body 200 easily conforms to the three-dimensional surface shape of the bulge of the wearer's buttocks, as shown in Figure 12, further improving the fit of the inner body 200 in the back body B. Also, in the front body F, the fit of the low-rigidity region 202 located at the front end of the inner body 200 is good.

[0065] When the third central region M3 and the fifth and sixth side regions S5 and S6 on either side thereof are made into stretchable regions, these regions can be formed by connecting assemblies with the same or different maximum elongation rates, but from the standpoint of ease of manufacturing, it is preferable to attach the waist lower elastic member 16 continuously along the width direction WD to the outer bodies 12F, 12B to form continuous stretchable regions throughout the entire width direction WD of the third central region M3 and the fifth and sixth side regions S5 and S6 on either side thereof.

[0066] In the illustrated example, the number of waist lower elastic members 16 located in the third central region M3 and the fifth side region S5 and sixth side region S6 on either side thereof can be determined as appropriate, but it is preferable to provide multiple members, for example, 2 to 5 members.

[0067] (interior body) The inner body 200 can have any shape, but in the illustrated example, it is substantially rectangular, with linear front and rear edges along the width direction and linear side edges along the front-to-rear direction. As shown in Figures 4 to 6 and 8, the inner body 200 is equipped with a top sheet 30 that forms the absorbent surface, a liquid-impermeable sheet 11, and an absorbent element 50 interposed between them, and performs an absorbing function. The front and rear ends of the inner body 200 are low-rigidity regions 202 that do not have an absorbent body 56. Reference numeral 60 denotes rising gathers 60 that extend from both sides of the inner body 200 so as to come into contact with the wearer's legs in order to prevent excrement from leaking from the sides of the inner body 200.

[0068] (Top sheet) The top sheet 30 is liquid permeable, and examples thereof include perforated or non-perforated nonwoven fabric, and perforated plastic sheet.

[0069] The side edges of the top sheet 30 may be folded back at the side edges of the absorbent element 50 as in the illustrated example, or may not be folded back and may extend out to the sides beyond the side edges of the absorbent element 50 .

[0070] In order to prevent the top sheet 30 from shifting relative to the backing member, it is desirable to fix the top sheet 30 to the adjacent backing member by a joining means that uses material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive HM. In the illustrated example, the top sheet 30 is fixed to the surface of the absorbent element 50 by a hot melt adhesive HM that is applied to the back surface of the top sheet 30.

[0071] Although not shown, an intermediate sheet (also called a "second sheet") that has a faster liquid permeability rate than the top sheet 30 can be provided between the top sheet 30 and the absorbent element 50 to prevent absorbed liquid from flowing back out of the absorbent body 56.

[0072] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include a plastic film made of a polyolefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminated sheet in which a nonwoven fabric or the like is overlaid and bonded to a plastic film. A liquid-impermeable and moisture-permeable material, which is preferred from the viewpoint of preventing stuffiness, is preferably used for the liquid-impermeable sheet 11. A widely used moisture-permeable plastic film is a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming the sheet, and then stretching the sheet in a uniaxial or biaxial direction. In addition, nonwoven fabrics using microdenier fibers, nonwoven fabrics whose leak-proofing properties have been enhanced by reducing the voids in the fibers through the application of heat or pressure, and sheets that have been made liquid-impermeable without using a plastic film by coating with a highly absorbent resin or a hydrophobic resin or a water-repellent agent can also be used as the liquid-impermeable sheet 11, but it is preferable to use a resin film in order to obtain sufficient adhesive strength when bonding with the cover nonwoven fabric 13 described below via a hot melt adhesive HM.

[0073] The liquid-impermeable sheet 11 may be of a width that fits on the back side of the absorbent element 50, with the remaining width being made up by other components, or it may be arranged so that it extends beyond both sides of the width of the absorbent element 50, as in the illustrated example.

[0074] As long as the liquid-impermeable sheet 11 is located behind the absorbent element 50, it may be located behind the sheet that forms the rising gathers, as in the illustrated example, or it may be located on the front side of the sheet that forms the rising gathers.

[0075] (Absorption element) The absorbent element 50 has an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 may be omitted. It is desirable to fix almost the entire back surface of the absorbent element 50 to a member adjacent to the back surface with a hot melt adhesive or the like, for purposes such as preventing displacement of the absorbent element 50 in the inner body 200.

[0076] (absorbent) The absorbent body 56 can be made of any known material, such as a fiber aggregate, without any particular limitations. As the fiber aggregate, a filament aggregate obtained by piling up short fibers such as cotton-like pulp or synthetic fibers, or by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed, can also be used. When piling up pulp, the fiber weight is, for example, 100 to 300 g / m 2 It can be about.

[0077] The absorbent body 56 may be rectangular in shape, but as shown in Figure 8, etc., it is preferable to have an hourglass shape with a narrowed portion 56N in the middle in the front-to-back direction that is narrower than the front and back sides, as this improves the fit of the absorbent body 56 itself and the rising gathers 60 to the crotch area.

[0078] The dimensions of the absorber 56 can be determined as appropriate, but it preferably extends from the position where it overlaps with the front exterior body 12F, through the crotch area, to the position where it overlaps with the rear exterior body 12B, and as shown in the illustrated example, it can extend to the peripheral edge of the interior body 200 or its vicinity in the front-to-rear direction LD and the width direction WD. Note that the symbol 56X indicates the overall width of the absorber 56.

[0079] It is desirable to fix almost the entire back surface of the absorbent body 56 to the adjacent member on the back side (packaging sheet 58 in this example) with a hot melt adhesive or the like in order to prevent the absorbent body 56 from shifting position in the inner body.

[0080] (Superabsorbent polymer particles) When the absorbent body 56 is formed from a fiber aggregate, superabsorbent polymer particles can be dispersed throughout part or all of the fiber aggregate. The term "superabsorbent polymer particles" includes not only "particles" but also "powder." The superabsorbent polymer particles used in this type of disposable diaper can be used as is. For example, it is desirable that the percentage of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) after sieving (shaking for 5 minutes) is 30% by weight or less. Furthermore, it is desirable that the percentage of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) after sieving (shaking for 5 minutes) after sieving is 60% by weight or more.

[0081] The material of the superabsorbent polymer particles is not particularly limited, but a water absorption capacity of 40 g / g or more is preferred. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials, such as starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably the commonly used powder-like form, but other shapes can also be used.

[0082] The highly absorbent polymer particles preferably have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to flow back out of the absorbent body 56, which is known as backflow.

[0083] Furthermore, the highly absorbent polymer particles preferably have a gel strength of at least 1000 Pa. This effectively prevents the sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

[0084] The basis weight of the highly absorbent polymer particles can be determined appropriately depending on the absorption amount required for the application of the absorbent body 56. Therefore, although it cannot be generalized, it is generally in the range of 100 to 300 g / m 2It can be said that:

[0085] (packaging sheet) When the packaging sheet 58 is used, tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, perforated sheet, etc. can be used as the material. However, it is preferable that the sheet does not allow the superabsorbent polymer particles to escape. When nonwoven fabric is used instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and polypropylene, polyethylene / polypropylene composite material, etc. can be used as the material. The basis weight of the packaging sheet 58 can be 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that:

[0086] The packaging structure of the packaging sheet 58 can be determined as appropriate, but from the standpoint of ease of manufacturing and preventing leakage of superabsorbent polymer particles from the front and rear edges, it is preferable to wrap the sheet around the absorbent 56 in a cylindrical shape so as to surround the front, back, and both side surfaces, with the front and rear edges extending beyond the front and rear of the absorbent 56, and to join the overlapping wound portions and the overlapping portions of the extending front and rear edges by a joining means such as a hot melt adhesive HM or material welding.

[0087] (Get up and gather) The rising gathers 60 have rising portions 68 that rise from the side portions of the inner body 200, and these rising portions 68 come into contact with the area from the wearer's groin, around the legs, to the buttocks, preventing side leakage. The rising portions 68 of the rising gathers 60 in the illustrated example extend only from the side edges of the inner body 200 toward the center in the width direction WD, but are not limited to this and can be modified as appropriate, for example, to include a base side portion that extends obliquely from the side edges of the inner body 200 toward the center in the width direction WD, and a tip side portion that extends obliquely from the tip of the base side portion toward the outside in the width direction WD.

[0088] Explaining in more detail, the rising gathers 60 in the illustrated example are formed by folding a strip-shaped gathered sheet 62 having a length spanning the entire front-to-rear direction LD of the inner body 200 back in the width direction WD at its tip (end) portion and folding it in half, with a plurality of elongated gathered elastic members 63 fixed at intervals in the width direction WD between the folded-over portion and the sheet in the vicinity thereof in a stretched state along the longitudinal direction. The base end portion of the rising gathers 60 located opposite the tip portion (the end portion opposite the folded-back portion of the sheet in the width direction WD) forms a root portion 65 fixed to the back side of the absorbent body 56 across the entire front-to-rear direction of the inner body 200, and the portion extending from this root portion 65 forms a main portion 66 folded back to the front side of the inner body 200 at a position along the side edge of the absorbent body 56. The front and rear ends of the main body 66 are formed as a front collapsed portion 67A and a rear collapsed portion 67B, which are fixed in a collapsed state to the side surfaces of the top sheet 30, while the portion located between them is formed as an unfixed raised portion 68, and a gathered elastic member 63 extending along the front-to-rear direction LD is fixed in a stretched state to at least the tip of this raised portion 68.

[0089] In the rising gathers 60 configured as described above, the contractile force of the gathered elastic members 63 causes the rising portions 68 to rise up so as to come into contact with the skin as shown by the arrows in Fig. 5. The gathered stretchable region GG to which the gathered elastic members 63 are fixed in the rising portions 68 may extend over the entirety of the rising portions 68 in the front-to-back direction LD, but preferably extends over an area excluding the front and rear ends of the rising portions 68. In this case, the front and rear ends of the rising portions 68 may not have gathered elastic members 63, or may have them but not be fixed to the rising portions 68, and may contract to their natural length.

[0090] The opposing surfaces of the front fallen portion 67A and the rear fallen portion 67B can be joined using a hot melt adhesive HM as in the illustrated example, or alternatively, material welding such as heat sealing or ultrasonic sealing can be used in addition to or instead of this.

[0091] As the gathered sheet 62, a nonwoven fabric that is soft and has excellent uniformity and hiding power, such as a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), or a meltblown nonwoven fabric, and that has been subjected to a water-repellent treatment with silicone or the like as necessary, can be suitably used. In this case, the fiber weight of the nonwoven fabric is 10 to 30 g / m 2 It is preferable that the thickness is about 150-350%. Rubber thread or the like can be used as the gathered elastic member 63. When spandex rubber thread is used, the thickness is preferably 470-1240 dtex, more preferably 620-940 dtex. The elongation percentage of the gathered elastic member 63 in the attached state is preferably 150-350%, more preferably 200-300%. The number of gathered elastic members 63 is preferably 2-6, more preferably 3-5. The appropriate spacing between the gathered elastic members 63 is 3-10 mm. With this configuration, the gathered elastic members 63 can easily contact the skin over their entire surface within the range in which they are arranged. The gathered elastic members 63 may be arranged not only on the tip side but also on the base side.

[0092] In the rising portion 68 of the rising gathers 60, at least one of various application methods of hot melt adhesive HM and material welding, such as heat sealing or ultrasonic sealing, can be used to bond the inner and outer layers of the gathered sheet 62 together and to secure the gathered elastic member 63 sandwiched therebetween. Bonding the entire inner and outer layers of the gathered sheet 62 together reduces flexibility, so it is preferable to leave the areas other than the adhesive portion of the gathered elastic member 63 unbonded or to only weakly bond them. In the illustrated example, hot melt adhesive HM is applied only to the outer peripheral surface of the gathered elastic member 63 using an application means such as a comb gun or a SureWrap nozzle, and the gathered elastic member 63 is sandwiched between the inner and outer layers of the gathered sheet 62. In the main body 66, the hot melt adhesive HM applied only to the outer peripheral surface of the gathered elastic member 63 secures the gathered elastic member 63 to the inner and outer layers of the gathered sheet 62 and secures the inner and outer layers of the gathered sheet 62 together.

[0093] (Side flap) Side flaps 70 are provided on both sides of the inner body 200, extending laterally from the rising gathers 60. As shown in the illustrated example, each side flap 70 is preferably a flat portion extending only laterally without being folded back. The dimension of each side flap 70 in the width direction WD can be determined as appropriate, but may be, for example, 0.1 to 0.2 times the dimension of the inner body 200 in the width direction WD.

[0094] Each side flap 70 has a side stretchable region SG that stretches in the front-to-back direction LD, at least in the region between the portion overlapping with the front exterior body 12F and the portion overlapping with the rear exterior body 12B. The side stretchable region SG is configured by one or more elongated side elastic members 73 attached along the front-to-back direction LD at intervals. The side elastic members 73 cause the region to contract in the front-to-back direction, while also allowing the region to stretch in the front-to-back direction. Furthermore, each side flap 70 preferably has a hollow portion (a portion where adjacent layers in the thickness direction are not joined) extending along its side edge in the front-to-back direction LD. Contraction of the side elastic members 73 causes the portion of the side flap 70 including the hollow portion to contract in the front-to-back direction LD, forming side gathers with numerous pleats aligned in the front-to-back direction LD.

[0095] As shown in the illustrated example, the side flaps 70 preferably have a first sheet layer 71 forming the innermost surface and a second sheet layer 72 forming the outermost surface, with side elastic members 73 provided between them. The sheet materials forming the first sheet layer 71 and the second sheet layer 72 are not particularly limited, and any suitable nonwoven fabric can be selected, such as the nonwoven fabrics usable for the above-mentioned rising gathers 60 and the above-mentioned outer bodies 12F and 12B. In the illustrated example, the side flaps 70 are constructed using an additional dedicated sheet material separate from the rising gathers 60, but the side flaps 70 can also be constructed by extending the sheet that constitutes the rising gathers 60. The front and rear ends of the side flaps 70 may or may not coincide with the front and rear ends of the rising gathers 60 (i.e., the front and rear ends of the inner body 200 in this case).

[0096] To explain the illustrated example in more detail, the liquid-impermeable sheet 11 arranged on the back side of the root portion 65 of the rising gathers 60 extends laterally beyond both side edges of the rising gathers 60, and a first sheet layer 71 joined to the front side of both side portions of this liquid-impermeable sheet 11 and a second sheet layer 72 joined to the back side extend laterally beyond both side edges of the liquid-impermeable sheet 11. In the illustrated example, the first sheet layer 71 and the second sheet layer 72 are formed from a single sheet folded back at the side edges of the side flaps 70. All of the side elastic members 73 may be located to the side of the liquid-impermeable sheet 11, but as in the illustrated example, if the side elastic members 73 are located at a position overlapping the liquid-impermeable sheet 11 and at a position to the side of the liquid-impermeable sheet 11, even if the contraction force of each side elastic member 73 in the unfolded state is the same, the part of the side flap 70 to the side of the liquid-impermeable sheet 11 will contract more than the part having the liquid-impermeable sheet 11, and the side flap 70 will also rise loosely toward the rising gather 60, which is preferable.

[0097] The side elastic members 73 are not particularly limited either, and can be elongated elastic members similar to the gathered elastic members 63 described above. The stretch rate of the side elastic members 73 in the unfolded side flaps 70 is preferably 0.6 to 0.9 times the stretch rate of the rising gathers 60. The number of side elastic members 73 is preferably less than that of the gathered elastic members 63 of the rising gathers 60, but may be the same or greater. The spacing of the side elastic members 73 in the width direction is not limited, but can be, for example, about 5 to 10 mm.

[0098] The side elastic members 73 are fixed to the first sheet layer 71 and the second sheet layer 72. To bond the first sheet layer 71 and the second sheet layer 72 together and to fix the side elastic members 73 sandwiched therebetween, various application methods of a hot melt adhesive HM or fixing means using material welding such as heat sealing or ultrasonic sealing can be used.

[0099] The fixed range of the side elastic members 73 in the front-to-back direction LD, i.e., the range of the side stretchable regions SG in the front-to-back direction LD, preferably extends from the portion overlapping with the front exterior body 12F to the portion overlapping with the rear exterior body 12B, as shown in the illustrated example, but is not limited to this. Therefore, for example, the front end of the side stretchable regions SG may be located at the rear end of the front exterior body 12F or further rearward. Similarly, the rear end of the side stretchable regions SG may be located at the front end of the rear exterior body 12B or further forward. It is also preferable that the range of the side stretchable regions SG in the front-to-back direction LD be the same as the contracted portion of the rising gathers 60 due to the gathered elastic members 63, or extend further forward and rearward than that portion.

[0100] The side elastic members 73 may be provided near the side edges of the side flaps 70 as in the illustrated example, but may not be provided in a certain section from the side edges toward the center in the width direction WD.

[0101] (Nonwoven cover) In a two-piece outer pants-type disposable diaper, the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B. Therefore, to prevent the liquid-impermeable sheet 11 from being exposed on the back surface of the inner body 200, it is preferable to provide a cover nonwoven fabric 13 that forms the back surface of the inner body 200 and covers at least the liquid-impermeable sheet 11 from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200. The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to their respective opposing surfaces via a hot melt adhesive HM. The nonwoven fabric used for the cover nonwoven fabric 13 can be selected, for example, from the same material as the outer bodies 12F and 12B.

[0102] 3 and 19, the cover nonwoven fabric 13 and the liquid-impermeable sheet 11 are bonded via a hot melt adhesive HM3 in a pattern in which cover bonded portions 13b continuous in the front-to-back direction LD and cover non-bonded portions 13n continuous in the front-to-back direction LD are alternately repeated in the width direction WD, and it is preferred that the liquid-impermeable sheet 11, the cover nonwoven fabric 13, and the cover non-bonded portions 13n extend in the front-to-back direction LD from between the front overlapping region 81 and the rear overlapping region 82 to the central region 25. As a result, the cover non-bonded portions 13n are continuous on both the front and rear sides of the fifth bonded portion b5, and gaps SP2 formed by the cover non-bonded portions 13n between the liquid-impermeable sheet 11 and the cover nonwoven fabric 13 improve breathability in the front-to-back direction LD.

[0103] (Position of the folded part of the rising gathers and the positional relationship between the folded part and the absorbent body) As shown in Figures 6 and 8 to 10, when the rear collapsed portion 67B of the rising gathers 60 is located only within the low stiffness region 202, the contractile force of the gathered elastic member 63 acts to pull the portion forward of the low stiffness region 202 toward the low stiffness region 202, and the stiffness changes suddenly at the front edge of the low stiffness region 202, so that, as shown in Figures 13 to 15, in the natural length state, the region having the inner body 200 in the rear body B bends so as to form a valley fold when viewed from the outside at the boundary 203 between the low stiffness region 202 and the rear edge of the absorbent body 56, and also bends so as to form a mountain fold when viewed from the outside at a position 204 spaced forward from the boundary between the low stiffness region 202 and the rear edge of the absorbent body 56. As a result, as shown in the illustrated example, the buttocks-covering portion C extends downward in the torso region E so that the dimension in the front-to-back direction LD increases toward the center in the width direction WD, and when the lower edge of the exterior bodies 12F, 12B of the front body F is the lower edge Ee of the torso region E and the lower edge of the exterior bodies 12F, 12B of the back body B is the lower edge Ce of the buttocks-covering portion C, the overall length of the buttocks-covering portion C in its natural length state is shorter than the overall length of the buttocks-covering portion C in its unfolded state. If the vertical shrinkage ratio of the buttocks-covering portion C in its natural length state is 0.4 to 0.7 (the lower limit is more preferably 0.5 and the upper limit is more preferably 0.6), the buttocks-covering portion C shrinks upward more than conventionally when worn and comes closer to the lower edge of the front exterior body 12F, which is linear along the width direction WD, so that the buttocks-covering portion C is less likely to get in the way when putting the legs through the leg openings LO. Furthermore, since the folding of the back body portion B is mostly eliminated while the garment is being worn, a small amount remains, and the portion between the valley folds and the mountain folds rises from the wearer's skin, creating an advantage of forming a space for storing body waste. Furthermore, if at least one of the rear collapsed portions 67B is fixed to the low-rigidity region 202 (i.e., closer to the waist opening WO than the edge of the absorber 56 on the waist opening WO side), the blocking range of the rising gathers 60 is expanded beyond the absorber 56 to the waist opening WO side.Here, the vertical shrinkage rate of the buttocks cover portion C in its natural length state means C1 / C2, where C1 and C2 are the lengths of the line segment connecting the intersection of one side edge of the inner body 200 and the front end (lowest end) of the buttocks cover portion C to the rear end (end on the waist opening WO side) of one side edge of the inner body 200 in its natural length state and in its unfolded state, respectively. The length C2 in the unfolded state is preferably about 190 to 210 mm.

[0104] In this case, the rear outer casing 12B has a first region 21, a second region 22, a third region 23, a fourth region 24, and a central region 25, and when it is bent so as to form a mountain fold when viewed from the outside at a position midway in the front-to-back direction LD of the central region 25, the resistance to the mountain fold is reduced, and the vertical contraction of the buttocks cover portion C in its natural length state becomes even more preferable.

[0105] 6 and 8 to 10, it is more preferable that the edge 67i of the rear fallen-down portion 67B on the central side in the width direction WD is located closer to the center in the width direction WD than the side edge 56e of the absorbent body 56. It is also preferable that the boundary 67b of the fallen-down portion 67 with the raised portion 68 is located 0 to 15 mm, particularly 0 to 10 mm, and even more particularly 0 to 5 mm, toward the waist opening WO from the edge of the absorbent body 56 on the waist opening WO side. This distance is indicated by 67d in FIG. 8. It is preferable that the rear fallen-down portion 67B is located close to the highly rigid absorbent body 56 in this way, as this stabilizes the position of the valley fold as seen from the outer surface.

[0106] The vertical shrinkage rate of the buttocks-covering portion C in its natural length can be adjusted by changing the degree of bending of the back body portion B, mainly by adjusting the elongation rate of the gather elastic members 63. Furthermore, the distance 12Bu in the front-to-back direction LD between the rear fallen-down portion 67B of the rising gathers 60 and the frontmost end of the rear exterior body 12B (the lowest end of the buttocks-covering portion C) is longer than the distance 12F in the front-to-back direction LD between the front fallen-down portion 67A of the rising gathers 60 and the lowest end of the front exterior body 12F, for example, by 2 to 4 times (more preferably 2.5 to 3.5 times), which is preferable because this makes it easier for the back body portion B to bend and reduces the vertical shrinkage rate of the buttocks-covering portion C in its natural length.

[0107] As shown in the illustrated example, it is preferable that both the front collapsed portion 67A and the rear collapsed portion 67B are located only within the low stiffness region 202, but it is also possible that only the rear collapsed portion 67B is located only within the low stiffness region 202, and the front collapsed portion 67A extends not only within the low stiffness region 202 but also to the region overlapping with the absorbent body 56.

[0108] In particular, the low-rigidity regions 202 (front and rear ends) of the inner body 200 are prone to gaps between themselves and the skin due to the difference in level with the absorbent body 56. Therefore, as in this example, if the lower-waist elastic members 16 of the outer bodies 12F, 12B are provided so as to be continuous in the width direction WD across the region overlapping with the low-rigidity regions 202 of the inner body 200, this region where gaps are likely to form is pressed toward the skin over the entire width direction WD, which is preferable from the standpoint of leak prevention. However, if the inner fastening part 201 is provided to include regions spanning both sides of the low-rigidity region 202 in the width direction WD and the fallen portions 67A, 67B are located in the low-rigidity region 202, the fallen portions 67 will contract in the width direction WD due to the contractile force of the lower-waist elastic members 16, not only in the natural length state but also in a state where they are stretched to a certain extent when worn. This narrows the width of the fallen portions 67A, 67B, which may reduce the width of the raised portions 68, i.e., the raised height. However, as mentioned above, when the fallen portions 67A, 67B are positioned close to the absorbent body 56, the fallen portions 67 are less likely to deform the end of the inner body 200 on the waist opening WO side in the width direction WD, so gaps are less likely to occur in the low rigidity region 202 of the inner body 200, and there is also less reduction in the risen height due to a reduction in the width of the fallen portions 67A, 67B.

[0109] The fixing region 67f for fixing the fallen portions 67A, 67B can be any suitable shape, such as square or rectangular. The width of the fixing region 67f (the width of the hot melt adhesive HM applied in the illustrated example) is preferably narrow if flexibility is important, but is preferably wide to stabilize the position and shape of the fallen portions 67A, 67B. For example, it is preferable for the width 67f to be 50% or more, and particularly 90% or more, of the width 67w of the fallen portions 67A, 67B. The width 67w of the fallen portions 67A, 67B is preferably 15 to 25 mm. Furthermore, to improve the ability to block excretory fluid that moves along the rising portion 68 toward the waist opening WO, it is preferable for the fixing region 67f of the fallen portions 67A, 67B to continue to the base portion 65.

[0110] The rigidity of the absorber 56 is not particularly limited, but it is preferable that the torsional stiffness of a predetermined portion of the absorber 56, including the end portion on the waist opening WO side, be 0.10 to 0.32 N·cm / cm, in order to stabilize the position and shape of the collapsed portions 67A, 67B using the rigidity of the absorber 56.

[0111] Furthermore, in the present example, when the rising gathers 60 have a root portion 65 fixed to the inner body 200 on the back side of the absorbent body 56, and the main body portion 66 is a portion folded from the root portion 65 to the front side of the inner body 200 at a position along the side edge of the absorbent body 56, it is preferable that the side portion of the rising gathers 60 from the folded position to the back side of the absorbent body 56 is not joined to the member adjacent to the back side. In this unjoined region 67x, the contractile force of the waist elastic member 17 is not transmitted to the fallen portions 67A, 67B, so that a decrease in the rising height due to a decrease in the width of the fallen portions 67A, 67B is more reliably suppressed. The width of this unjoined region 67x is not particularly limited, but it is preferably at least 50%, and particularly at least 90%, of the width of the fixed region 67f of the fallen portions 67A, 67B.

[0112] Furthermore, as in this example, when the outer bodies 12F, 12B have an innermost sheet layer 12C that extends across both sides of the inner body 200 in the width direction WD and covers the inner body 200 from the waist opening WO side to the portion adjacent to the crotch side of the low-rigidity region 202, the edge of the inner body 200 on the waist opening WO side can be covered, preventing the edge from deteriorating the feel against the skin. Furthermore, the non-bonded region of the innermost sheet layer 12C also functions as a leakage prevention wall in the front-to-back direction LD. However, if the innermost sheet layer 12C is fixed to the rising portion 68, even if the rising portion 68 is expanded toward the waist opening WO using the above-mentioned structure, the movement of the rising portion 68 will be hindered by the innermost sheet layer 12C, reducing the fit of the rising gathers 60. Therefore, in this case, it is preferable that the innermost sheet layer 12C has a joined area CA on the waist opening WO side where it is joined to an adjacent member on the back side, and a non-joined area NC on the crotch side where it is not joined to an adjacent member on the back side, based on an imaginary line in the width direction WD that passes through the flattened portions 67A, 67B, because this allows the risen portions 68 to expand toward the waist opening WO while preventing a decrease in the fit of the risen portions 68.

[0113] (nonwoven fabric) As the nonwoven fabric in the above description, known nonwoven fabrics can be used as appropriate depending on the location and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, for example, synthetic fibers such as polyolefins (e.g., polyethylene or polypropylene), polyesters, and polyamides (including single-component fibers as well as core-sheath and other composite fibers), regenerated fibers (e.g., rayon or cupra), and natural fibers (e.g., cotton), and mixtures of these can also be used. To increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. Furthermore, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified into staple fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle-punched nonwoven fabrics, point-bond nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), etc. depending on the fiber length, sheet formation method, fiber bonding method, and laminated structure, and any of these nonwoven fabrics can be used.

[0114] <Explanation of terms used in the specification> In the present specification, the following terms have the following meanings unless otherwise specified in the specification.

[0115] "Front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), with the front-rear direction and width direction being perpendicular to each other.

[0116] "Front side" means the side closest to the wearer's skin when the pants-type disposable diaper is worn, and "rear side" means the side farthest from the wearer's skin when the pants-type disposable diaper is worn.

[0117] "Front surface" means the surface of a component that is closest to the wearer's skin when the pants-type disposable diaper is worn, and "rear surface" means the surface that is farthest from the wearer's skin when the pants-type disposable diaper is worn.

[0118] "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2 times.

[0119] "Maximum elongation rate" means the elongation rate when stretched to the elastic limit (in other words, the elongation rate when the stretchable area is contracted (including any contraction, such as contraction due to elastic members) or when it is unfolded flat without slack).

[0120] "Gel strength" is measured as follows: 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine (a mixture of 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion-exchanged water) and stirred with a stirrer. The resulting gel is left in a constant temperature and humidity chamber at 40°C and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured using a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0121] "Basis weight" is measured as follows: After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. From the test piece that has reached a constant weight, use a sample collection template (100mm x 100mm) to cut out a sample measuring 100mm x 100mm. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter, which is the basis weight.

[0122] The "thickness" of thick members such as the absorber 56 and the absorption element 50 is measured using a thickness measuring device (Peacock, Dial Thickness Gauge, Model H (measuring range 0 to 10 mm, measuring area 10 mm diameter circular terminal, measuring force approximately 1.7 N, pressure approximately 21.7 KPa)) manufactured by Ozaki Manufacturing Co., Ltd., with the sample and the thickness measuring device positioned horizontally.

[0123] The "thickness" of thin sheets such as nonwoven fabrics was measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) with a load of 0.098 N / cm 2 , and pressure area: 2cm 2 Automatic measurement is performed under the following conditions. "Torsion hardness" refers to the measurement value obtained in the following test. In order to apply as little force as possible to the absorbent body, a section of the absorbent body measuring 60 mm in the front-to-back direction from the edge of the waist opening to the crotch side was cut out with a width of 140 mm so that the absorbent body was positioned in the center of the width direction, and the entire section was wrapped in a single layer of crepe paper (15 g / m²). 2 ) to prepare a specimen. Using a torsion testing machine (Kato Tech, KES-YN-1-B), both ends (10 mm) of the specimen in the width direction are gripped with chucks with a chuck distance of 110 mm, and the maximum load (torsion hardness) is measured when the specimen is twisted 70° around the longitudinal center axis. The test conditions are SENS (recording sensitivity): 10, torsion angle: 7, CONTROL: 7, and speed: 12 cm / s. The test is conducted on five specimens, and the average value is used as the measured value of torsion hardness.

[0124] The water absorption capacity is measured according to JIS K7223-1996 "Test method for water absorption capacity of superabsorbent resins."

[0125] The water absorption rate is the "time to the end point" when 2g of superabsorbent polymer and 50g of physiological saline are used and the test is carried out in accordance with JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers."

[0126] "Expanded state" means a state in which the material is stretched to its elastic limit (in other words, a state in which the material is contracted (including any contraction, such as contraction due to an elastic member) or is deployed flat without slack).

[0127] Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0128] If no environmental conditions are specified for a test or measurement, the test or measurement shall be carried out in a test room or device under standard conditions (temperature of 23±1°C, relative humidity of 50±2%). [Industrial Applicability]

[0129] The present invention can be used in pants-type disposable diapers such as those in the above examples. [Explanation of symbols]

[0130] 11...liquid-impermeable sheet, 12A...side seal, 12B...rear exterior body, 12C...innermost sheet layer, 12F, 12B...exterior body, 12F...front exterior body, 12H...inner sheet layer, 12S...outer sheet layer, 12X...cutout portion, 13...cover nonwoven fabric, 13b...cover adhesive portion, 13n...cover non-adhesive portion, 15 to 17...elastic member, 15...waist elastic member, 16...waist lower elastic member, 17...cover elastic member, 200...interior body, 201 ...interior fixing portion, 202...low rigidity region, 21-24...first to fourth regions, 21...first region, 210...width, 22...second region, 220...maximum width, 23...third region, 24...fourth region, 25...central region, 30...top sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...standing gathers, 62...gathered sheet, 63...gathered elastic member, 65...root portion, 66...main body portion, 67A, 67B...falling portion, 67A...front-falling Flattening portion, 67B... rear flattening portion, 68... rising portion, 70... side flap, 71... first sheet layer, 72... second sheet layer, 73... side elastic member, 81... front overlapping region, 82... rear overlapping region, B... back body, BL... boundary line, C... buttocks cover portion, E... torso region, F... front body, HM... hot melt adhesive, L... middle region, LD... front and rear direction, LO... leg opening, M1... first central region, M2... second central region, M3... third central region, S 1...first side region, S2...second side region, S3...third side region, S4...fourth side region, S5...fifth side region, S6...sixth side region, SG...side stretch region, T...torso forming region, U...lower waist region, U1...upper region, U2...lower region, W...waist region, WD...width direction, WO...waist opening, b1-b5...bonded region, b1...first bonded region, b2...second bonded region, b3...third bonded region, b4...fourth bonded region, b5...fifth bonded region.

Claims

1. A front body and a back body, A front exterior body provided on the front body; A rear exterior body provided on the rear body; An inner body extending from a widthwise intermediate portion of the front body through a crotch portion to a widthwise intermediate portion of the back body; an adhesive portion in which the inner body and the front outer body are joined via a hot melt adhesive in a front overlapping region where the inner body and the front outer body overlap; an adhesive portion in which the inner body and the rear outer body are joined via a hot melt adhesive in a rear overlapping region where the inner body and the rear outer body overlap; side seals formed by joining both side portions of the exterior body in the front body and both side portions of the exterior body in the back body; A waist opening and a pair of left and right leg openings are provided, the front exterior body and the rear exterior body are spaced apart in the front-rear direction, At least one of the front overlapping region and the back overlapping region has a first region in which the adhesive portions are provided continuously or intermittently along the crotch side edge and at both widthwise ends thereof, a second region in which the adhesive portions are provided continuously or intermittently along the waist opening side edge, a third region in which the adhesive portions are provided continuously or intermittently along one side edge and at both front and rear ends thereof, a fourth region in which the adhesive portions are provided continuously or intermittently along the other side edge and at both front and rear ends thereof, and a central region which is surrounded by the first region, the second region, the third region, and the fourth region and does not have the adhesive portions, a portion where the first region and the third region overlap and a portion where the first region and the fourth region overlap, There is no overlapping portion between the second region and the third region and no overlapping portion between the second region and the fourth region, the adhesive portion in the overlapping portion between the first region and the third region and the overlapping portion between the first region and the fourth region is a first adhesive portion to which the hot melt adhesive is applied with a first basis weight; the adhesive portion in the second region is a second adhesive portion to which the hot melt adhesive is applied at a second basis weight that is less than the first basis weight, the adhesive portion in a portion of the third region that does not overlap with the first region is a third adhesive portion to which the hot melt adhesive is applied at a third basis weight that is less than the first basis weight, the adhesive portion in a portion of the fourth region that does not overlap with the first region is a fourth adhesive portion to which the hot melt adhesive is applied at a fourth basis weight that is less than the first basis weight, The adhesive portion in a portion of the first region that does not overlap with the third region and the fourth region is a fifth adhesive portion to which the hot melt adhesive is applied at a fifth basis weight that is equal to or less than the first basis weight. A pants-type disposable wearing article characterized by:

2. The first basis weight is 20 to 40 g / m ２ wherein the second basis weight, the third basis weight, the fourth basis weight, and the fifth basis weight are 0.2 to 0.8 times the first basis weight.

2. The pants-type disposable wearing article according to claim 1.

3. a lower edge of the front exterior body and a lower edge of the rear exterior body each having a notch recessed toward a waist opening at a portion adjacent to a side of the first adhesive portion; 3. The pants-type disposable wearing article according to claim 1 or 2.

4. At least one of the front exterior body and the rear exterior body has an exterior central portion located in the central region and having an exterior elastic member, and the exterior central portion is elastically stretchable between a natural length state in which it is contracted in the width direction together with the exterior elastic member and an expanded state in which it is stretched in the width direction together with the exterior elastic member to a maximum stretch rate of 120 to 180%, The inner body does not have an elastic member that stretches in the width direction in a portion facing the outer central portion having the elastic member.

3. The pants-type disposable wearing article according to claim 1 or 2.

5. The inner body includes an absorbent body, a liquid-permeable top sheet disposed on the front side of the absorbent body, a liquid-impermeable sheet disposed on the back side of the absorbent body, and a cover nonwoven fabric covering the back surface of the liquid-impermeable sheet, the cover nonwoven fabric and the liquid-impermeable sheet are bonded together via a hot melt adhesive in a pattern in which cover adhesive portions that are continuous in the front-rear direction and cover non-adhesive portions that are continuous in the front-rear direction are alternately repeated in the width direction, the liquid-impermeable sheet, the cover nonwoven fabric, and the cover non-adhesive portion extend in the front-to-rear direction from between the front overlapping region and the rear overlapping region to the central region; 5. The pants-type disposable wearing article according to claim 4.

6. the front exterior body and the rear exterior body each have a trunk region defined as a region between one of the side seals and the other of the side seals, the rear exterior body has a buttocks cover portion extending below the torso region so that the dimension in the front-to-rear direction increases toward the center in the width direction, The lower edge of the front exterior body is the lower edge of the trunk region, the lower edge of the rear exterior body is the lower edge of the buttocks cover portion, The inner body has rising gathers on both sides in the width direction thereof, the rising gathers extending over the entire front-to-rear direction of the inner body, The rising gathers have a main body portion extending from a position along the side edge of the absorbent body in the inner body to the front side of the inner body, a front fallen portion formed by fixing a front end of the main body portion to the surface of the inner body in a fallen state, a rear fallen portion formed by fixing a rear end of the main body portion to the surface of the inner body in a fallen state, an unfixed rising portion located between the front fallen portion and the rear fallen portion, and a gathered elastic member provided along the front-to-rear direction at least at the tip of the rising portion, At least the rearward-falling portion is located only within the low-rigidity region, the rear exterior body has the first region, the second region, the third region, the fourth region, and the central region, In a natural length state, the region of the rear body having the inner body is bent so as to form a valley fold when viewed from the outside at the boundary between the low-rigidity region and the rear edge of the absorbent body, and is bent so as to form a mountain fold when viewed from the outside at a position spaced forward from the boundary between the low-rigidity region and the rear edge of the absorbent body and midway in the front-to-rear direction of the central region, The longitudinal shrinkage ratio of the buttocks cover portion in a natural length state is 0.4 to 0.7 times.

3. The pants-type disposable wearing article according to claim 1 or 2.

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