Underpants type disposable wearing article

Abstract

To provide an underpants type disposable wearing article including a standing auxiliary function of a wearer.SOLUTION: An underpants type disposable wearing article is such that: a back body B has a slender back support elastic member 27 extending from a first position E1 positioned in a boundary between a left side seal part 21 and a waist part W at least to a left leg peripheral region L2, and from a second position E2 positioned in a boundary between a right side seal part 21 and the waist part W at least to a right leg peripheral region L3 so as to approach a crotch region L while approaching a center in a width direction WD; and an arrangement part of the back support elastic member 27 in the back body B elastically expands and contracts between a natural length state of being shrunk along the back support elastic member 27 due to shrinkage of the back support elastic member 27, and an expanded state of being extended along the back support elastic member 27 with extension of the back support elastic member 27.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to pants-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary napkins. [Background technology]

[0002] Pant-type disposable wearing articles (including trunk-type ones) have side seals where both sides of the front body are joined to both sides of the back body by welding. The side seals have a number of welds arranged at intervals in a predetermined pattern. The formation of the side seals forms a flat assembly into a pant-like or trunk-like shape with a waist opening and leg openings.

[0003] In such pants-type disposable wearing articles, in order to improve the fit to the body, stretchable structures are provided in the torso region of the outer body, which is defined as the region between the side seals, or in an intermediate region located between the front and rear torso regions, resulting in a relatively high fit to the body (see, for example, Patent Documents 1 to 3). The stretchable structure is generally formed by fixing an elastic member in a stretched state between the inner and outer sheet layers that make up the outer body. In an outer body with this stretchable structure, the outer body contracts due to the contractile force of the elastic member when at its natural length, and when worn, the outer body stretches against the contractile force of the elastic member, resulting in the outer body fitting to the body due to the contractile force of the elastic member.

[0004] When the stretch structure of the outer garment is formed by elongated elastic members such as threads or strips, the elastic members are arranged in a predetermined pattern along the stretch direction, and multiple elastic members are arranged at intervals to form stretchable regions. For example, when tightening the torso region in the waist direction, the elastic members are arranged along the width direction. When tightening the edges of the leg openings in the leg direction, the elastic members are arranged in a pattern that runs from one side seal along the edge of the leg opening toward the width center, across the width center toward the other leg opening, and then along the other leg opening to the other side seal.

[0005] On the other hand, recently, a device has been proposed that utilizes the contractile force of an elastic member to assist the function of the muscles around the pelvis (such as abdominal muscles) and stabilize the pelvis (see, for example, Patent Document 4).

[0006] However, there is no known device that assists the wearer in standing up. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-115544 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-217940 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-202246 [Patent Document 4] Patent No. 6503489 Summary of the Invention [Problem to be solved by the invention]

[0008] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a pants-type disposable wearing article that has a function of assisting the wearer in standing up. [Means for solving the problem]

[0009] The following pants-type disposable wearing article has solved the above problems. <First aspect> The garment comprises a front body, a back body, a pair of left and right side seal portions formed by joining both side edges of the front body and both side edges of the back body, respectively, a waist opening, and a pair of left and right leg openings, The front body and the back body each have a torso region defined as a region between the pair of left and right side seal portions, and a crotch region located between edges of the pair of left and right leg openings, The torso regions of the front body and the back body comprise a waist portion extending along the upper edge from the left side seal portion to the right side seal portion, and a lower waist portion adjacent to and below the waist portion and extending from the left side seal portion to the right side seal portion, The waist portion has a waist elastic member, and is elastically stretchable between a natural length state in which the waist portion is contracted in the width direction due to contraction of the waist elastic member and an expanded state in which the waist portion is stretched as the waist elastic member is stretched, The crotch region has a central region defined as a region between a left imaginary straight line along the front-to-rear direction passing through a point on the left edge of the leg opening that is located closest to the center in the width direction and a right imaginary straight line along the front-to-rear direction passing through a point on the right edge of the leg opening that is located closest to the center in the width direction, a left leg-around region defined as a region between the left edge of the leg opening and the left imaginary straight line, and a right leg-around region defined as a region between the right edge of the leg opening and the right imaginary straight line. A pants-type disposable wearing article, the rear body has elongated rear support elastic members extending from a first position located at the boundary between the left side seal portion and the waist portion to at least the left leg region, and from a second position located at the boundary between the right side seal portion and the waist portion to at least the right leg region, each of which approaches the widthwise center and approaches the crotch region; The portion of the rear body where the rear support elastic member is disposed elastically stretches and contracts between a natural length state in which the rear support elastic member is contracted along the rear support elastic member due to contraction of the rear support elastic member, and an expanded state in which the rear support elastic member is stretched along the rear support elastic member as the rear support elastic member is extended. A pants-type disposable wearing article characterized by:

[0010] (Action and effect) When the wearer is standing, the rear body section is not subjected to much longitudinal stretching force, and the rear support elastic members remain at their natural length in the longitudinal direction. However, when the wearer changes position from standing to sitting, the hip joints flex, causing the wearer's buttocks to protrude, increasing the distance between the waist and the gluteal crease on the wearer's body surface. The waist elastic members press the waist section of the pants-type disposable garment above the iliac crest, preventing the rear body section from slipping down. The rear support elastic members extend from above the iliac crest to pass closer to the center of the body than the greater trochanter. Furthermore, when the wearer's legs are inserted into both leg openings, the front body section catches the rear body section, preventing it from slipping up. Therefore, a stretching force is effectively applied to the rear support elastic members, causing the rear support elastic members to stretch from their natural length or close to it in accordance with the increase in the distance between the waist and gluteal crease on the wearer's body surface, accumulating a contractile force. Therefore, in this pants-type disposable wearing article, when the wearer stands up from this seated position, the contractile force of the rear support elastic member acts in a direction that assists in extending the hip joint, thereby assisting the wearer in standing up.

[0011] <Second aspect> The torso region and the crotch region of the front body and the back body have elongated leg elastic members that extend from a third position located on the boundary between the left side seal portion and the lower end of the waist lower portion to at least the left leg region, and from a fourth position located on the boundary between the right side seal portion and the lower end of the waist lower portion to at least the right leg region, approaching the center in the width direction and approaching the crotch region, the portions where the leg elastic members are disposed are elastically stretchable between a natural length state where the portions are contracted along the leg elastic members as the leg elastic members contract, and an expanded state where the portions are stretched along the leg elastic members as the leg elastic members expand, The rear support elastic member extends from the first position to at least a position where it intersects with the leg elastic member of the left leg region, and from the second position to at least a position where it intersects with the leg elastic member of the right leg region. A pants-type disposable wearing article according to a first embodiment.

[0012] (Action and effect) Without the leg elastic members of this embodiment, the rear support elastic members would pull and shift the left and right leg regions toward the wearer's buttocks while seated, potentially contracting and resulting in insufficient accumulation of contractile force for assisting standing up. Furthermore, if the left and right leg regions shift toward the wearer's buttocks while seated, this could result in a poor fit. In contrast, with the configuration of this embodiment, the contractile force of the rear support elastic members, which pulls the first and second position regions in opposite directions, is supported by the waist elastic members over a wide area of ​​the waist, while the force pulling the left and right leg regions in opposite directions is supported by the leg elastic members over a wide area of ​​the left and right leg regions. As a result, this embodiment not only prevents the left and right leg regions from shifting while seated, but also prevents insufficient accumulation of contractile force for assisting standing up.

[0013] <Third aspect> The waist elastic members are elongated elastic members that are provided at intervals in the front-to-rear direction and extend in the width direction, The rear support elastic members are elongated elastic members provided at intervals in a direction perpendicular to the rear support elastic members, The leg elastic members are elongated elastic members provided at intervals in a direction perpendicular to the leg elastic members, the force required to stretch one of the waist elastic members 150% in the length direction is equal to or greater than the force required to stretch one of the rear support elastic members 150% in the length direction, and the number of the waist elastic members is greater than the number of the rear support elastic members, or the force required to stretch one of the waist elastic members 150% in the length direction is greater than the force required to stretch one of the rear support elastic members 150% in the length direction, and the number of the waist elastic members is equal to the number of the rear support elastic members; the force required to stretch one of the leg elastic members 150% in the lengthwise direction is equal to or greater than the force required to stretch one of the rear support elastic members 150% in the lengthwise direction, and the number of the leg elastic members is greater than the number of the rear support elastic members, or the force required to stretch one of the leg elastic members 150% in the lengthwise direction is greater than the force required to stretch one of the rear support elastic members 150% in the lengthwise direction, and the number of the leg elastic members is equal to the number of the rear support elastic members; A pants-type disposable wearing article according to a second embodiment.

[0014] (Action and effect) When configured in this manner, the waist portion, left leg area, and right leg area are less likely to slip when sitting, and the accumulation of contractile force for assisting standing as described above is less likely to become insufficient.

[0015] <Fourth aspect> The lower waist portion has a plurality of elongated lower waist elastic members arranged at intervals in the front-to-rear direction and extending along the width direction, and the lower waist portion has the lower waist elastic members and is elastically stretchable between a natural length state in which the lower waist elastic members contract in the width direction due to contraction of the lower waist elastic members and an expanded state in which the lower waist elastic members expand, the force required to stretch one of the lower waist elastic members 150% in the length direction is smaller than the force required to stretch one of the waist elastic members 150% in the length direction, the force required to stretch one of the leg elastic members 150% in the length direction, and the force required to stretch one of the rear support elastic members 150% in the length direction; A pants-type disposable wearing article according to a third aspect.

[0016] (Action and effect) The lower waist portion often has multiple, elongated lower waist elastic members spaced apart in the front-to-rear direction and extending widthwise. In such cases, the configuration of this embodiment is preferable because the lower waist portion is less likely to inhibit the elongation of the rear support elastic members (which inhibits the accumulation of contractile force required to assist standing) when the wearer is sitting.

[0017] <Fifth aspect> the front body has elongated front support elastic members extending from a fifth position located at the boundary between the left side seal portion and the waist portion and from a sixth position located at the boundary between the right side seal portion and the waist portion, each of which approaches the center in the width direction and approaches the crotch region; The portion of the front body where the front support elastic member is disposed elastically expands and contracts between a natural length state where the portion contracts along the front support elastic member due to contraction of the front support elastic member, and an expanded state where the portion stretches along the front support elastic member as the front support elastic member stretches. The pants-type disposable wearing article according to any one of the first to fourth aspects.

[0018] (Action and effect) With such front support elastic members, the portions of the rear support elastic members on the first position side and the fifth position side, and the portions of the rear support elastic members on the second position side and the sixth position side can be pressed above the iliac crest and hooked onto the iliac crest. Therefore, in this aspect, the ends of the rear support elastic members on the first position side and the second position side are less likely to slip down when sitting, making it less likely that the rear support elastic members will be hindered from stretching (hindering the accumulation of contractile force to assist standing up).

[0019] <Sixth aspect> The inner edge of the side seal portion adjacent to the waist portion has a protruding portion located closer to the center in the width direction than the inner edge of the side seal portion adjacent to the waist lower portion. The pants-type disposable wearing article according to any one of the first to fifth aspects.

[0020] (Action and effect) By providing the protrusions in the side seals as in this embodiment, the protrusions can be hooked above the wearer's iliac crest, which makes it difficult for the ends of the rear support elastic members on the first and second positions to slip down when the wearer is sitting, and makes it difficult for the rear support elastic members to stretch (interfere with the accumulation of contractile force to assist standing up).

[0021] <Seventh aspect> The waist portion of the rear body has a non-slip portion on the inner surface of the widthwise range having the rear support elastic member, and no non-slip portion is provided between the waist portion and the crotch region. The pants-type disposable wearing article according to any one of the first to sixth aspects.

[0022] (Action and effect) As in this embodiment, the waist portion of the rear body has an anti-slip portion as in this embodiment, but there is no anti-slip portion between the waist portion and the crotch region, which makes it less likely that the end positions of the rear support elastic member on the first position side and the end positions on the second position side will slip down when sitting, making it less likely that the rear support elastic member will be hindered from stretching (hindering the accumulation of contractile force to assist in standing up).

[0023] <Eighth aspect> the waist lower portion has a central region defined as a region between the left imaginary line and the right imaginary line, a left region defined as a region between the left imaginary line and the left side seal portion, and a right region defined as a region between the right imaginary line and the right side seal portion, the rear support elastic members extend from the first position through the left region to at least the left leg region and from the second position through the right region to at least the right leg region, in a pattern in which the acute side crossing angle of a tangent to the front-to-rear direction continuously decreases and then passes through one inflection point or a straight line portion, and the acute side crossing angle of a tangent to the front-to-rear direction continuously increases, the inflection point or the straight line portion is located on a widthwise center side of the left region and a widthwise center side of the right region, The acute crossing angle of the tangent line of the inflection point or the straight line portion with respect to the front-to-rear direction is 5 to 30 degrees. The pants-type disposable wearing article according to any one of the first to seventh aspects.

[0024] (Action and effect) The positioning of the rear support elastic member can be determined as appropriate, but when it is positioned as in this embodiment, it is preferable because it allows the rear support elastic member to stretch (accumulate contractile force) when the wearer changes posture from standing to sitting, and to contract the rear support elastic member to assist in hip joint extension (utilize contractile force) particularly effectively when the wearer stands up from a sitting position.

[0025] <Ninth Aspect> An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, and an inner body including an absorbent body, which is fixed to the outer body so as to extend from the front body to the back body, the side seal portions are 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, The exterior body in the front body and the exterior body in the back body each have a portion that forms the torso region and a portion that forms the crotch region, The outer body has the waist elastic member and the rear support elastic member. The pants-type disposable wearing article according to any one of the first to eighth aspects.

[0026] (Action and effect) A pants-type disposable wearing article having the member configuration of this embodiment is preferable because it can be manufactured by a general manufacturing method. [Effects of the Invention]

[0027] According to the present invention, the device has a function of assisting the wearer in standing up. [Brief explanation of the drawings]

[0028] [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] FIG. [Figure 4] 4 is a cross-sectional view taken along line 4-4 of FIG. 1. [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. 4 is a plan view showing a cutting pattern of the elastic member. [Figure 8] FIG. 3 is an enlarged plan view (outer surface side) of a main part of FIG. 2. [Figure 9] FIG. 2 is a plan view showing an adhesive application pattern. [Figure 10]1 is a plan view (outer surface side) showing various regions of a pants-type disposable diaper in an unfolded state. [Figure 11] FIG. 2 is an enlarged plan view of a main part of the pants-type disposable diaper in an unfolded state. [Figure 12] 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Figure 13] 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Figure 14] 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Figure 15] 1 is a plan view (inner surface side) of a pants-type disposable diaper in an unfolded state. [Figure 16] 1 is an enlarged plan view (outer surface side) of a main part of a pants-type disposable diaper in an unfolded state. [Figure 17] FIG. 2 is a rear view showing the pants-type disposable diaper being worn. [Figure 18] 10A and 10B are explanatory diagrams illustrating changes in posture of a wearer. [Figure 19] 10 is a graph showing test results. [Figure 20] 10 is a graph showing test results. DETAILED DESCRIPTION OF THE INVENTION

[0029] An example of a pants-type disposable wearable article will be described in detail below with reference to the accompanying drawings. Note that the dotted patterns in the drawings indicate adhesive used as a joining means for joining the respective components located on the front and back sides of the article. This adhesive can be applied, for example, by solid, bead, curtain, summit, or spiral application of hot melt adhesive, or by pattern coating (transfer of hot melt adhesive using a relief printing method). Alternatively or in addition to these, hot melt adhesive can be applied to the outer surface of the elastic member using a comb gun or SureWrap application to secure the elastic member. 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. Material welding, such as heat sealing or ultrasonic sealing, can also be used to join the respective components.

[0030] Furthermore, as the nonwoven fabric in the following 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 those made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including those made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified according to the fiber length, sheet formation method, fiber bonding method, and laminate structure 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-bonded nonwoven fabrics, and laminated nonwoven fabrics (including SSS nonwoven fabrics in which identical or similar nonwoven fabric layers are laminated, as well as SMS nonwoven fabrics and SMMS nonwoven fabrics in which different nonwoven fabric layers are laminated, in which a meltblown layer is sandwiched between spunbond layers), and any of these nonwoven fabrics can be used. A laminated nonwoven fabric means a nonwoven fabric manufactured as an integrated nonwoven fabric including all layers, and which has been subjected to a fiber bonding process across all layers, and does not include a nonwoven fabric made separately and bonded together by a bonding means such as a hot melt adhesive.

[0031] 1 to 9 show an example of a pants-type disposable diaper. This pants-type disposable diaper (hereinafter simply referred to as a diaper) comprises a front body F, a back body B, a pair of left and right side seal portions 21 formed by joining both side edges of the front body F and both side edges of the back body B, a waist opening WO, and a pair of left and right leg openings LO. Note that the left and right are based on the wearer when wearing the diaper. The front body F refers to the entire area in front of the center of the diaper in the front-to-back direction LD, and the back body B refers to the entire area in back of the center of the diaper in the front-to-back direction LD. As shown in FIG. 10 , the front body F and back body B each have a torso region T defined as the area between a pair of side seals 21 and a crotch region L located between the edges of a pair of left and right leg openings LO. The torso region T is made up of a waist region W extending from one side seal 21 to the other along the upper edge, and a lower waist region U extending from one side seal 21 to the other side seal 21 adjacent to the lower edge of the waist region W. If the torso region T has a boundary where stretchability in the width direction WD changes (e.g., where the thickness or maximum elongation rate of the elastic members changes), the waist region W will be above the uppermost boundary (near the waist opening WO). (If there is a gap between the lowermost elastic member of the waist region W and the uppermost elastic member of the lower waist region U, the boundary will be the center of that gap.) The length of these portions in the front-to-back direction LD can be determined appropriately depending on the size of the product. For example, the waist region W can be 15 to 40 mm, and particularly 25 to 35 mm. The crotch region L also has a central region L1 defined as the region between a left imaginary straight line V1 along the front-to-back direction LD that passes through a point on the left leg opening edge 29 that is located closest to the center in the width direction WD and a right imaginary straight line V2 along the front-to-back direction LD that passes through a point on the right leg opening edge 29 that is located closest to the center in the width direction WD, a left leg-around region L2 defined as the region between the left leg opening edge 29 and the left imaginary line V1, and a right leg-around region L3 defined as the region between the right leg opening edge 29 and the right imaginary line V2.

[0032] The front body F and back body B in the illustrated example comprise an outer body 20 that continues 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 an inner body 10 including an absorbent body 13 that is fixed to the outer body 20 so as to extend from the front body F to the back body B, and the side seal portion 21 is formed by joining both side ends of the outer body 20 in the front body F to both side ends of the outer body 20 in the back body B, and the outer body 20 in the front body F and the outer body 20 in the back body B each have portions that form the torso region T and the crotch region L, but this is not limited to this and other known structures may be adopted.

[0033] (Example of interior body structure) As shown in Figures 3 to 6, the inner body 10 has a structure in which an absorbent body 13 is provided between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12, and the absorbent body 13 absorbs and retains excrement that has permeated the top sheet 11. There are no particular restrictions on the planar shape of the inner body 10, but it is generally a substantially rectangular shape as shown in the example shown. The inner body 10 is preferably configured to have the absorbent body 13 at least in the crotch region M of the outer body 20. The crotch region M refers to the middle portion when the crotch region L is divided into three equal parts in the front-to-rear direction.

[0034] (absorbent) The absorbent body 13 may be a known material, such as a pulp fiber stack, an aggregate of filaments such as cellulose acetate, or a material based on nonwoven fabric, with a highly absorbent polymer mixed or fixed thereto as needed. The absorbent body 13 may be wrapped in a wrapping sheet 14 such as crepe paper or nonwoven fabric, which has liquid permeability and liquid retention, as needed, to maintain the shape and retain the polymer.

[0035] The superabsorbent polymer particles can be those used in this type of absorbent article as they are. For example, it is desirable that the proportion of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) when sieved (shaken for 5 minutes) is 30% by weight or less, and it is also desirable that the proportion of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) when sieved (shaken for 5 minutes) is 60% by weight or more.

[0036] The superabsorbent polymer particles are not particularly limited, but those with a water absorption speed of 35 to 60 seconds and a water absorption capacity of 50 to 70 g / g can be suitably used. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, and those such as starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers can be suitably used. The basis weight of the superabsorbent polymer particles can be determined appropriately depending on the absorption capacity required for the product. Therefore, although it is not possible to generalize, it is generally preferred to use particles of 100 to 350 g / m. 2 It can be said that:

[0037] The planar shape of the absorber 13 can be determined as appropriate, and in the illustrated example, it has a shape with a narrower constricted portion 13N in the front-to-rear direction range including the crotch region M than both the front and rear ends thereof, but it can be any appropriate shape such as a rectangle. The dimensions of the constricted portion 13N can be determined as appropriate, and the length of the constricted portion 13N in the front-to-rear direction can be about 20 to 50% of the total length Y of the diaper, and the width of its narrowest portion 13m can be about 40 to 60% of the total width of the absorber 13.

[0038] As shown in Figures 1 and 3 to 5, it is preferable to provide diffusion grooves 17 extending in the front-to-rear direction LD in the middle of the width direction WD of the absorbent body 13, as this improves the diffusion of urine in the front-to-rear direction LD. From the viewpoint of urine diffusion, it is preferable that the diffusion grooves 17 extend to both the front and rear sides of the crotch region L. There may be only one diffusion groove 17 in the center of the width direction WD, but multiple diffusion grooves 17 can also be provided at intervals in the width direction WD. In the illustrated example, the diffusion grooves 17 extend linearly, but they may also extend curvedly.

[0039] The diffusion grooves 17 are preferably slits that penetrate the absorbent body 13 in the thickness direction as in the illustrated example, but may also be recesses that do not penetrate the absorbent body 13 in the thickness direction and are provided on at least one of the front and back sides of the absorbent body 13. When recesses are formed in the absorbent body 13, they can be formed by reducing the basis weight at the recess formation position compared to the surrounding area, or they can be formed by compressing the recess formation position by embossing.

[0040] The position of the diffusion groove 17 is not limited as long as it is provided in the middle of the width direction WD of the absorbent body 13, but the center of the width direction WD is usually desirable, and the width (width 17d of the diffusion groove 17 in the case of a single groove) is desirably 5 to 20% of the overall width 13w of the absorbent body 13. Furthermore, the length 17L of the diffusion groove 17 in the front-to-rear direction LD can be determined appropriately, and can be, for example, about 30 to 70% of the overall length of the absorbent body 13.

[0041] (Top sheet) The top sheet 11, which is placed on the front side of the absorbent body 13 and forms the skin contact surface, is preferably made of a perforated or non-perforated nonwoven fabric or a porous plastic sheet. In the illustrated example, the top sheet 11 is folded back onto the back side of the absorbent body 13 so as to fit along the side edges of the absorbent body 13, but is not limited to this and other known structures can be used.

[0042] (Liquid-impermeable sheet) The liquid-impermeable sheet 12 placed on the back side of the absorbent body 13 is typically a liquid-impermeable plastic sheet such as polyethylene or polypropylene, although in recent years, moisture-permeable sheets have been preferred to prevent stuffiness. Examples of this water-proof / moisture-permeable sheet include microporous sheets obtained by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. In the illustrated example, the liquid-impermeable sheet 12 is folded back to the back side on both sides of the absorbent body 13 in the width direction WD together with the top sheet 11, but this is not limited to this and other known structures can also be used.

[0043] (Get up and gather) It is preferable that rising gathers BS that fit the wearer's crotch area are formed on both sides of the inner body 10, but these can be omitted. As shown in Figures 5 and 6, these rising gathers BS are formed by a gathered sheet 15 that is folded over and doubles up: a fixed portion fixed to the side of the back surface of the inner body 10 with an adhesive or the like, a main body portion extending from this fixed portion along the side of the inner body 10 to the side of the front surface of the inner body 10, a collapsed portion formed by fixing the front and rear ends of the main body portion in a collapsed state to the side of the front surface of the inner body 10 with an adhesive or the like, and a free portion formed by leaving the space between these collapsed portions unfixed. A water-repellent nonwoven fabric coated with a silicone-based, paraffin metal-based, or alkylchromic clod-based water repellent agent or the like is preferably used as the gathered sheet 15.

[0044] Furthermore, elongated gather elastic members 16 are disposed at the tips of the free portions between the double gathered sheets 15. The gather elastic members 16 are used to raise the free portions by elastic stretching force to form standing gathers BS in the finished product state, as shown by the two-dot chain line in Fig. 5.

[0045] The gathered elastic member 16 can be made of commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, polyester, etc. To make it difficult to see from the outside, it is recommended that the thickness be 925 dtex or less, the elongation rate at the time of attachment be 150 to 350%, and the spacing be 10.0 mm or less. The gathered elastic member 16 can be in the form of a thread as shown in the example, or a tape-like member of a certain width.

[0046] (Inner body joint area) The joining region 18 of the inner body 10 to the outer body 20 may be provided in a rectangular shape, for example, over almost the entire inner body 10, or may have any other suitable shape, such as a width in the middle in the front-to-rear direction LD that is narrower than the widths on both the front and rear sides, as shown in FIG.

[0047] (Example of exterior body) A known structure can be adopted for the outer body 20. In the illustrated example, the outer body 20 is continuous across the front and back trunk pieces F and B and is constricted in the middle in the front-to-back direction LD, with both side edges of this constriction forming the edges 29 of the leg openings of the diaper. However, the present invention is not limited to this. The width of the constricted portion 13N can be narrower than the width of the inner body 10, or the outer body 20 of the front trunk piece F and the outer body 20 of the back trunk piece B can be provided separately and spaced apart in the front-to-back direction LD at the center of the diaper (not shown), thereby forming the edges 29 of the leg openings of the diaper by the edges of the outer body 20 and the side edges of the inner body 10.

[0048] 1 to 9, the crotch region M of the outer body 20 includes a pair of inner thigh portions 31 that extend outward in the width direction WD beyond the circumscribed rectangle of the absorbent body 13 (meaning an imaginary rectangle that circumscribes the absorbent body 13 in a plan view in the unfolded state; in this example, one opposite side of the circumscribed rectangle of the absorbent body 13 is approximately equal to both sides of the inner body 10). The portions of the inner thigh portions 31 along the edges 29 of the leg openings form a pair of leg tube portions 30 that surround the bases of the thighs. The dimensions of the inner thigh portions 31 may be determined appropriately depending on the length of the leg tube portions 30. However, it is generally preferable that the width 31x of the inner thigh portions 31 at the narrowest portions of the outer body 20 be approximately 1 to 5% of the overall length Y of the diaper. The inner thigh portions 31 and leg tube portions 30 are not required.

[0049] When a pair of inner thigh portions 31 and leg tube portions 30 are provided, as shown in Figure 11, in the front body F, when an imaginary line V3 is drawn from an imaginary point P1 located closest to the center in the width direction WD on the edge 29 of the leg opening at an angle θ1 of 20 degrees with respect to the width direction WD toward the outside in the width direction WD and toward the waist, it is preferable that this imaginary line V3 has an intersection point P2 with the side edge of the exterior body 20 in the front-to-back direction LD range where the side seal portion 21 is located, and the front-to-back direction LD distance 30f from this intersection point P2 to the edge 29 of the leg opening is preferably greater than or equal to the width 31x of the inner thigh portion 31 at the narrowest part of the exterior body 20, and is preferably approximately the same. On the other hand, in the back body piece B, when an imaginary line V4 is drawn from an imaginary point P1 located closest to the center in the width direction WD on the edge 29 of the leg openings at an angle θ2 of 30 degrees with respect to the width direction WD toward the waist, this imaginary line V4 preferably intersects with a side edge of the exterior body 20 in the front-to-back direction LD range including the side seal portions 21, and the front-to-back direction LD distance 30b from this intersection point P3 to the edge 29 of the leg openings may be equal to or less than the width 31x of the inner thigh portion 31 at the narrowest part of the exterior body 20. Of course, these conditions may not be satisfied and the dimension of the crotch region L in the front-to-back direction LD may be long and the dimension of the side seal portions 21 in the front-to-back direction LD may be short, as in the example shown in Fig. 12.

[0050] 4, various elastic members 24-28 for imparting stretchability are disposed on the exterior body 20. The exterior body 20 has at least an area (the entire area in the illustrated example) having the elastic members 24-28, and preferably has an inner sheet layer 22 and an outer sheet layer 23, and the elastic members 24-28 are sandwiched between the inner sheet layer 22 and the outer sheet layer 23.

[0051] (Constituent sheets of exterior body 20) The inner sheet layer 22 and the outer sheet layer 23 may each be formed from a single sheet material, or may be formed by folding a single sheet material in part or in whole. The illustrated exterior body 20 has a first sheet 20A and a second sheet 20B. In the lower waist region U, the inner sheet layer 22 is formed from the first sheet 20A, and the outer sheet layer 23 is formed from the second sheet 20B. In the waist region W, the inner sheet layer 22 and the outer sheet layer 23 are respectively formed from a folded-up portion 20C of the second sheet 20B folded up at the edge of the waist opening WO and a portion facing outward therefrom. The illustrated first sheet 20A may be omitted, and the folded-up portion 20C of the second sheet 20B in the figure may be extended toward the crotch, with all elastic members sandwiched between the sheets at the folded-up portion 20C. Alternatively, all elastic members may be sandwiched between the first sheet 20A and the second sheet 20B regardless of whether the folded-up portion 20C is provided.

[0052] When the elastic members 24-28 are stretched in the stretch direction, at least the portions located at both ends in the stretch direction (in this case, the width direction WD) are fixed to the inner sheet layer 22 contacting the inside of the elastic members 24-28 and the outer sheet layer 23 contacting the outside of the elastic members 24-28. This integrates the elastic members 24-28 with the inner sheet layer 22 and the outer sheet layer 23. The portions where the elastic members 24-28 are disposed elastically stretch and contract between a natural length state in which they are contracted by the contractile force of the elastic members 24-28 and an expanded state in which they are stretched together with the elastic members 24-28. At this time, if the inner sheet layer 22 and the outer sheet layer 23 do not elastically stretch and contract together with the elastic members 24-28, the inner sheet layer 22 and the outer sheet layer 23 will contract by the contractile force of the elastic members 24-28 in the natural length state, forming pleats on the inner and outer surfaces, which will then widen as they are stretched, and disappear in the expanded state. Conversely, when the inner sheet layer 22 and the outer sheet layer 23 contract from the expanded state, they are pleated as they contract, and are most tightly pleated in the natural length state.

[0053] In such an elastic structure, if the inner sheet layer 22 and the outer sheet layer 23 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 22 and the outer sheet layer 23 are directly or indirectly bonded over almost their entirety.

[0054] As shown in FIGS. 1 and 4 , a cover sheet 50 may be provided to cover the front and rear ends of the inner body 10 attached to the inner surface of the outer body 20 and to prevent leakage from the front and rear edges of the inner body 10. More specifically, the cover sheet 50 extends across the entire width direction WD, from the inner surface of the folded-back portion 20C located at the end of the front body F closest to the waist opening WO to where it overlaps with the front end of the inner body 10, and from the inner surface of the folded-back portion 20C located at the end of the back body B closest to the waist opening WO to where it overlaps with the rear end of the inner body 10. When such a cover sheet 50 is provided, the inner surface of the torso region T of the outer body 20 is formed by the cover sheet 50. The folded-back portion 20C, formed by folding the outer body 20 onto the inner surface of the diaper, may also be extended to the portion where it overlaps with the inner body 10 to form a portion equivalent to the cover sheet 50 shown in the illustration. In this case, the folded-back portion 20C forms the inner surface of the outer body 20. The cover sheet 50 may be bonded continuously or intermittently over almost the entire surface thereof using an adhesive such as a hot melt adhesive or a welding method such as ultrasonic welding or heat sealing, or a non-adhesive portion may be provided over the entire width direction WD (or just the center portion) at the edge on the inner body 10 side, and this non-adhesive portion may be raised above the top sheet 11 to function as a leak-proof wall.

[0055] The elastic members 24 to 28 may be appropriately selected from among elongated elastic members such as threads or strips, as well as elastic sheets such as elastic films.

[0056] Nonwoven fabrics are suitable for the constituent sheets of the exterior body 20 (in the illustrated example, the second sheet 20B, the first sheet 20A, and the cover sheet 50) from the viewpoint of breathability and texture, but any material can be used as long as it can be welded at the side seal portion 21. For example, other materials, such as thermoplastic resin sheets such as elastic films, can be used instead of or in addition to the nonwoven fabric. When using nonwoven fabric, it is recommended that the fineness be 1 to 3 dtex and the basis weight be 10 to 25 g / m. 2Although 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 body 20 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.

[0057] To explain the illustrated example in more detail, in each of the front body panel F and the back body panel B, the exterior body 20 in the waist region W has a plurality of elongated waist elastic members 24 extending in the width direction WD and arranged at intervals in the front-to-back direction LD, and the lower waist region U has a plurality of elongated lower waist elastic members 25 extending in the width direction WD and arranged at intervals in the front-to-back direction LD. The waist region W forms a stretchable region that elastically stretches between a natural length state contracted in the width direction WD by contraction of the waist elastic members 24 and an expanded state stretched as the waist elastic members 24 expand. The lower waist region U forms a stretchable region that elastically stretches between a natural length state contracted in the width direction WD by contraction of the lower waist elastic members 25 and an expanded state stretched as the lower waist elastic members 25 expand. The waist elastic members 24 tighten the edge of the waist opening WO of the diaper mainly to prevent the diaper from slipping down or leaking, and the lower waist elastic members 25 mainly improve the fit of the diaper around the waist over a wide area.

[0058] The garment also has elongated rear support elastic members 27 that extend from a first position E1 located on the boundary between the left side seal portion 21 and the waist portion W to at least the left leg region L2, and from a second position E2 located on the boundary between the right side seal portion 21 and the waist portion W to at least the right leg region L3, respectively, approaching the center in the width direction WD and approaching the crotch region L. The portion of the back body B where the rear support elastic members 27 are located elastically stretches and contracts between a natural length state in which the rear support elastic members 27 contract along the rear support elastic members 27 as they contract, and an expanded state in which the rear support elastic members 27 stretch along the rear support elastic members 27 as they expand. The function and other details of the rear support elastic members 27 will be described later.

[0059] In the example shown in Fig. 2, the front body piece F and the back body piece B each have elongated leg elastic members 26 extending from a third position E3, located at the boundary between the left side seal portion 21 and the lower end of the waist lower portion U, to at least the left leg region L2, and from a fourth position E4, located at the boundary between the right side seal portion 21 and the lower end of the waist lower portion U, to at least the right leg region L3, toward the center in the width direction WD and toward the crotch region L. The leg elastic members 26 are primarily intended to improve the fit of the diaper in the areas along the edges 29 of the leg openings. Unlike the illustrated example, the leg elastic members 26 may be provided on only one of the front body piece F and the back body piece B, or not on both. Furthermore, when the leg elastic members 26 are provided on both the front body F and the back body B, all of the group of leg elastic members 2628 arranged on the front body F side and all of the group of leg elastic members 26 arranged on the back body B side may be spaced apart in the front-to-back direction LD without intersecting each other, or some of the leg elastic members 26 may intersect (not shown). In the illustrated example, almost all of the leg elastic members 26 are arranged in a curved line, but some may also be arranged in a straight line.

[0060] 13, the garment may have elongated front support elastic members 28 extending from a fifth position E5 located at the boundary between the left side seal portion 21 and the waist portion W to at least the left leg region L2, and from a sixth position E6 located at the boundary between the right side seal portion 21 and the waist portion W to at least the right leg region L3, each extending toward the center in the width direction WD and toward the crotch region L. The portions of the front body F where the front support elastic members 28 are located elastically stretch between a natural length state in which they contract along the front support elastic members 28 as the front support elastic members 28 contract, and an expanded state in which they stretch along the front support elastic members 28 as the front support elastic members 28 stretch. Details of the function of the front support elastic members 28 will be described later.

[0061] 2 does not include any elastic members other than the waist elastic members 24, lower waist elastic members 25, leg elastic members 26, and rear support elastic members 27 and front support elastic members 28 described below, but other elastic members may be included as long as the functions of these members are not impaired. For example, as shown in FIG. 12, in addition to (or instead of) the leg elastic members 26, a plurality of elongated elastic members 26S extending in the width direction WD may be arranged at intervals in the front-to-back direction LD on at least one of the front body piece F and the back body piece B in the crotch region L of the exterior body 20.

[0062] The elongated elastic members 24-28 are spaced apart to form predetermined stretchable regions without contacting or intersecting each other, and are fixed in a stretched state at a predetermined stretch rate along each continuous direction. As a result, stretchable regions are formed in the torso region T and the crotch region L. Of these, the portion having only the waist elastic member 24 and the lower waist elastic member 25 elastically stretches and contracts in the direction along the waist elastic member 24 and the lower waist elastic member 25, while the portion having only the rear support elastic member 27 elastically stretches and contracts in the direction along the rear support elastic member 27. When the leg elastic members 26 are included, the portion having only the leg elastic member 26 elastically stretches and contracts in the direction along the leg elastic member 26. When the front support elastic members 28 are included, the portion having only the front support elastic member 28 elastically stretches and contracts in the direction along the front support elastic member 28. Furthermore, the portion having the waist elastic member 24, the lower waist elastic member 25, and the rear support elastic member 27 elastically stretches and contracts not only in the width direction WD but also in the direction along the rear support elastic member 27. The portion having the rear support elastic member 27 and the leg elastic members 26 elastically stretches and contracts not only in the direction along the rear support elastic member 27 but also in the direction along the leg elastic members 26. The portion having the waist elastic member 24, the lower waist elastic member 25, and the leg elastic members 26 elastically stretches and contracts not only in the width direction WD but also in the direction along the leg elastic members 26. The portion having the waist elastic member 24, the lower waist elastic member 25, and the front support elastic member 28 elastically stretches and contracts not only in the width direction WD but also in the direction along the front support elastic member 28. The portion having the front support elastic member 28 and the leg elastic members 26 elastically stretches and contracts not only in the direction along the front support elastic member 28 but also in the direction along the leg elastic members 26.

[0063] The maximum elongation rate of each portion can be adjusted by the thickness, number, spacing, and elongation rate at the time of attachment of the elastic members 24-28. In particular, the thickness, number, and spacing of the elastic members 24-28 are preferably selected so that the maximum elongation rate of a specific portion of the outer body 20 is approximately equal to the elongation rate at the time of attachment of the elastic members 24-28 that contract that specific portion when the inner body 10 is unfastened or removed (e.g., 80% or more, more preferably 90% or more of the elongation rate at the time of attachment). As an example, in the case of a pants-type disposable diaper for adults, the maximum elongation rate in the width direction WD of the waist region W and the lower-waist region U can be approximately 160-320%, and the maximum elongation rate in the direction along the rear support elastic members 27 of the portion having only the rear support elastic members 27 can be approximately 270-330%. When the leg elastic members 26 are included, the maximum elongation rate in the direction along the leg elastic members 26 of the portion having only the leg elastic members 26 can be approximately 250-310%. When the front support elastic members 28 are provided, the maximum elongation rate of the portion having only the front support elastic members 28 in the direction along the front support elastic members 28 can be set to approximately 270 to 330%.

[0064] The thickness, number, and spacing in the front-to-back direction LD of the waist elastic members 24 can be determined as appropriate. For example, the waist elastic members 24 can have a thickness of about 790 to 1090 dtex, a number of about 5 to 9, and a spacing in the front-to-back direction LD of about 3 to 7 mm; the lower waist elastic members 25 can have a thickness of about 470 to 770 dtex, a number of about 10 to 20, and a spacing in the front-to-back direction LD of about 10 to 20 mm; the leg elastic members 26 can have a thickness of about 470 to 770 dtex, a number of about 3 to 7, and a spacing in the direction perpendicular to the leg elastic members 26 of about 5 to 15 mm; and the rear support elastic members 27 and the front support elastic members 28 can have a thickness of about 940 to 1240 dtex, a number of about 3 to 7, and a spacing in the direction perpendicular to each other of about 5 to 15 mm.

[0065] The numbers of waist elastic members 24, lower waist elastic members 25, and leg elastic members 26 are preferably the same in the front body F and the back body B, but may be different for one or all of the elastic members. Similarly, the numbers of rear support elastic members 27 and front support elastic members 28 are preferably the same, but may be different.

[0066] The elastic members 24-28 are attached continuously in the width direction WD from one side seal portion 21 to the other side seal portion 21, or from one leg opening edge 29 to the other leg opening edge 29. The elastic members 25-28 other than the waist elastic member 24 are preferably cut into small pieces in a central region CP in the width direction WD to partially or completely eliminate or reduce the stretch provided by the elastic members 25-28, forming a non-stretchable region in at least one of the front body F and the back body B. The regions on both sides of the non-stretchable region are preferably not cut, maintaining the stretch provided by the elastic members 25-28. The cut region may be, for example, a region that includes the entire joining region 18 of the inner body 10 in the width direction WD, or it may be only the middle portion of the joining region 18 in the width direction WD (for example, a region that includes the entire width direction WD of the diffusion groove 17, as shown in FIG. 16). The maximum stretch in the width direction WD of the non-stretchable region is preferably less than 110%.

[0067] Methods for cutting the elastic members 24 to 28 to form the non-stretchable regions include, for example, the techniques described in Japanese Patent Application Laid-Open Nos. 2002-35029, 2002-178428, and 2002-273808. Of course, as shown in Fig. 12, any one or all of the elastic members 25 to 28 may be left uncut, so that they extend continuously from one side seal portion 21 to the other side seal portion 21, or from the edge 29 of one leg opening to the edge 29 of the other leg opening.

[0068] An adhesive such as a hot melt adhesive is preferably used as a means for fixing the elastic members 24-28 to the inner sheet layer 22 and the outer sheet layer 23. The inner sheet layer 22 and the outer sheet layer 23 can be bonded together using an adhesive, or, to reduce the amount of adhesive used, the inner sheet layer 22 and the outer sheet layer 23 can be welded together by ultrasonic welding, heat sealing, or the like. For example, when the elastic members 24-28 are elongated, bonding the inner sheet layer 22 and the outer sheet layer 23 with adhesives B1 and B2 at the positions where the elastic members 24-28 pass can serve to both bond the inner sheet layer 22 and the outer sheet layer 23 and fix the elastic members 24-28 to the inner sheet layer 22 and the outer sheet layer 23. In particular, it is preferable that the adhesive B1 used to secure the elastic members 24, 25, such as the waist elastic member 24 and the lower waist elastic member 25, which are arranged linearly in the width direction WD, be applied only to the area where the waist elastic member 24 is located and its vicinity and the area where the lower waist elastic member 25 is located and its vicinity, thereby securing the waist elastic member 24 and the lower waist elastic member 25 to the inner sheet layer 22 and the outer sheet layer 23 and joining the inner sheet layer 22 and the outer sheet layer 23. Such application of adhesive B1 can be achieved by sandwiching the elastic members 24, 25, whose outer peripheral surfaces have been coated with adhesive B1, between the sheet layers 20A, 20B.

[0069] On the other hand, the adhesive for fixing the elastic members 26-28, which are arranged so that their positions change in the front-to-back direction LD, such as the leg elastic members 26, rear support elastic members 27, and front support elastic members 28, can be applied by continuously applying adhesive B2 in the width direction WD with the required application width in the front-to-back direction LD, as shown in Fig. 9, or by arranging rectangular adhesive application areas (not shown) in a stepped pattern to match the positional changes of the elastic members, so that the adhesive is applied only to the areas where the elastic members 26-28 are arranged and within a predetermined vertical and horizontal distance from them. One of these application patterns can be adopted over the entire area of ​​the elastic members 26-28 in the front-to-back direction LD, or one can be selected and adopted depending on the location.

[0070] In these cases, although not shown, in order to reinforce the fixation of the elastic members 24 to 28, additional hot melt adhesive can be applied only to predetermined regions including both end portions of the elastic members 24 to 28.

[0071] Furthermore, although not shown, it is also possible to fix only predetermined areas including both ends and midpoints of the elastic members 24 to 28 to the inner sheet layer 22 and the outer sheet layer 23 via a hot melt adhesive, and join the inner sheet layer 22 and the outer sheet layer 23 at locations other than the positions where the elastic members 24 to 28 pass by using a welding means such as ultrasonic welding.

[0072] When the elastic members 24-28 are elastic sheets such as elastic films, the inner sheet layer 22 and the outer sheet layer 23 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 22 and the outer sheet layer 23 are joined only within the through-holes. An indirect joining portion is one in which the elastic sheet does not have through-holes, and the inner sheet layer 22 and the outer sheet layer 23 are joined via the elastic sheet. For these joining portions, a welding method such as ultrasonic welding or an adhesive such as a hot-melt adhesive can be used.

[0073] The adhesive applicator may be selected as appropriate. When applying the adhesive intermittently, a contact applicator in which a sprayer is brought into contact with the object to be coated when applying the hot melt adhesive is suitable. Examples of contact applicators include slot coaters and roll coaters. On the other hand, when applying the adhesive continuously over a wide area, a non-contact applicator in which the sprayer is not brought into contact with the object to be coated but the hot melt adhesive is sprayed by air is suitable. Examples of non-contact applicators include a spiral applicator capable of applying a spiral coat, an omega applicator or control seam applicator capable of applying a wave coat, a curtain applicator capable of applying a surface coat, and a dot applicator capable of applying a dot coat.

[0074] (rear support elastic member) As shown in Fig. 17, the rear body panel B of the pants-type disposable diaper 1 has rear support elastic members 27. When the pants-type disposable diaper 1 is used, as shown in Fig. 18, when a wearer 60 is standing, almost no stretching force is applied to the rear body panel B in the front-to-rear direction LD, and therefore the rear support elastic members 27 are in a nearly natural length state (contracted state) in the front-to-rear direction LD. However, when the wearer 60 changes posture from standing to sitting, the hip joints flex and the buttocks of the wearer 60 protrude, increasing the distance between the waist and the gluteal crease on the body surface of the wearer 60. As shown in Figure 17, the waist portion W of the pants-type disposable diaper 1 is pressed above the wearer's iliac crest by the waist elastic member 24, making it difficult for the rear body portion B to slip down, and the rear support elastic member 27 extends from above the iliac crest so as to pass closer to the center of the body than the greater trochanter, and when the wearer's legs are inserted into both leg openings LO, the front body portion F acts as a catch, making it difficult for the rear body portion B to slip up.As a result, an elongation force (see the arrows of the wearer in a seated position in Figure 18) is effectively applied to the rear support elastic member 27, and the rear support elastic member 27 is elongated from its natural length or close to it in accordance with the increase in the distance between the waist and gluteal crease on the surface of the wearer's 60 body, accumulating a contraction force. Therefore, in the pants-type disposable diaper 1, when the wearer 60 stands up from this sitting position, the contractile force of the rear support elastic member 27 acts in a direction that assists in the extension of the hip joint (see the arrow of the standing wearer in Figure 18), thereby assisting the wearer 60 in standing up.

[0075] 2 and other figures, the rear support elastic member 27 preferably extends from the first position E1 through at least the left leg region L2 to a portion of the central region L1 located in the crotch region M, and from the second position E2 through the right leg region L3 to a portion of the central region L1 located in the crotch region M. It is also preferable that the rear support elastic member 27 extends from the first position E1 through at least the left leg region L2, the central region of the crotch region, and the right leg region L3 to the second position E2.

[0076] 2, when the leg elastic members 26 are provided, if the rear support elastic members 27 extend from the first position E1 to at least the position where they intersect with the leg elastic members 26 in the left leg region L2 and from the second position E2 to at least the position where they intersect with the leg elastic members 26 in the right leg region L3, the contractile force of the rear support elastic members 27 pulling the first position E1 and the second position E2 in opposite directions is supported over a wide area of ​​the waist region W by the waist elastic members 24, and the force pulling the left leg region L2 and the right leg region L3 in opposite directions is supported over a wide area of ​​the left leg region L2 and the right leg region L3 by the leg elastic members 26. As a result, in this embodiment, not only is the left leg region L2 and the right leg region L3 less likely to slip out of place when sitting, but the accumulation of contractile force required for assisting standing up is also less likely to become insufficient. In contrast, without the leg elastic members 26, the rear support elastic members 27 would pull and shift the left and right leg regions L2 and L3 toward the wearer's buttocks when sitting, causing the regions to contract, which could result in insufficient accumulation of contractile force for assisting standing up.Furthermore, the left and right leg regions L2 and L3 shifting toward the wearer's buttocks when sitting could also result in a worsening fit.

[0077] In the illustrated example, the group of rear support elastic members 27 includes those extending from the first position E1 and the second position E2, as well as those extending from a seventh position E7 located at the boundary between the left side seal portion 21 and the upper end of the waist lower portion U, and an eighth position E8 located at the boundary between the right side seal portion 21 and the upper end of the waist lower portion U. As can be seen from this example, it is not necessary for all of the rear support elastic members 27 to extend from the first position E1 and the second position E2, but all of the rear support elastic members 27 may extend from the first position E1 and the second position E2. The same applies to the group of front support elastic members 28.

[0078] The arrangement pattern of the rear support elastic members 27 can be determined as appropriate as long as the above-mentioned standing-up assist function is achieved. For example, if the region of the lower waist portion U between the left imaginary line V1 and the right imaginary line V2 is defined as the central region U1, the region between the left imaginary line V1 and the left side seal portion 21 is defined as the left region U2, and the region between the right imaginary line V2 and the right side seal portion 21 is defined as the right region U3, as shown in the illustration, the rear support elastic members 27 preferably extend from the first position E1 through the left region U2 to at least the left leg region L2 and from the second position E2 through the right region U3 to at least the right leg region L3 in a pattern in which the acute-side crossing angle of the tangent to the front-to-back direction LD continuously decreases and then passes through a single inflection point 27i (or may be a diagonal straight line portion) and continuously increases, as shown in the illustration, for ease of manufacture.

[0079] The position and angle of the inflection point 27i (or straight line portion) can be determined as appropriate, but it is preferable that the inflection point 27i (or straight line portion) is located toward the center of the width direction WD of the left region U2 and the center of the width direction WD of the right region U3, and that the acute angle side intersection angle θ3 of the tangent (or straight line portion) of the inflection point 27i with respect to the front-to-back direction LD is 5 to 30 degrees, because this ensures that the rear support elastic member 27 passes closer to the center of the body than the greater trochanter, thereby enabling particularly effective extension of the rear support elastic member 27 (accumulation of contractile force) when the wearer changes posture from standing to sitting, and assistance in hip joint extension (utilization of contractile force) by contraction of the rear support elastic member 27 when the wearer stands up from a sitting position.

[0080] For the same reasons, it is preferable that the inflection point 27i (or straight line portion) be located in the central region when the back body B is divided into thirds in the front-to-back direction LD and thirds in the width direction WD, in addition to or instead of the position of the inflection point 27i (or straight line portion).

[0081] To improve the reliability of stretching (accumulation of contractile force) of the rear support elastic members 27 when the wearer changes posture from standing to sitting, it is preferable that the ends of the rear support elastic members 27 on the first position E1 side and the second position E2 side, as well as the portions located in the left leg region L2 and the right leg region L3, are less likely to slip off the surface of the wearer's body. From this perspective, in the illustrated example, the force required to stretch one waist elastic member 24 150% in the length direction is equal to or greater than the force required to stretch one rear support elastic member 27 150% in the length direction, and the number of waist elastic members 24 is greater than the number of rear support elastic members 27 (or the force required to stretch one waist elastic member 24 150% in the length direction is greater than the force required to stretch one rear support elastic member 27 150% in the length direction, and the number of waist elastic members 24 is greater than the number of rear support elastic members 27). (or the force required to stretch one leg elastic member 26 150% in the lengthwise direction may be equal to or greater than the force required to stretch one rear support elastic member 27 150% in the lengthwise direction, and the number of leg elastic members 26 is greater than the number of rear support elastic members 27 (or the force required to stretch one leg elastic member 26 150% in the lengthwise direction is greater than the force required to stretch one rear support elastic member 27 150% in the lengthwise direction, and the number of leg elastic members 26 is equal to the number of rear support elastic members 27). This makes it more difficult for the waist region W, left leg region L2, and right leg region L3 to slip when sitting, and makes it more unlikely that the accumulation of contractile force required to assist standing up will be insufficient.

[0082] Furthermore, to improve the reliability of hip joint extension assistance (utilization of contractile force) by the contraction of the rear support elastic members 27 when the wearer stands up from a seated position, it is preferable to reduce the occurrence of stretch inhibition (interference with the accumulation of contractile force for standing up assistance). From this perspective, when the lower waist elastic members 25 are provided as in the illustrated example, it is preferable that the force required to stretch one lower waist elastic member 25 150% in the longitudinal direction be smaller than the force required to stretch one waist elastic member 24 150% in the longitudinal direction, the force required to stretch one leg elastic member 26 150% in the longitudinal direction, and the force required to stretch one rear support elastic member 27 150% in the longitudinal direction. This magnitude relationship can be achieved by appropriately selecting at least one of the thickness and material of each elastic member.

[0083] 13, when the front support elastic member 28 is provided, the portions of the rear support elastic member 27 on the first position E1 side and the portions of the front support elastic member 28 on the fifth position E5 side, as well as the portions of the rear support elastic member 27 on the second position E2 side and the portions of the front support elastic member 28 on the sixth position E6 side, can be pressed above the iliac crest and hooked onto the iliac crest. Therefore, by providing the front support elastic member 28, the ends of the rear support elastic member 27 on the first position E1 side and the second position E2 side are less likely to slip down when sitting, making it less likely that the rear support elastic member 27 will be hindered from elongating (hindering the accumulation of contractile force to assist in standing up).

[0084] The arrangement pattern of the front support elastic members 28 is preferably asymmetrical to the arrangement pattern of the rear support elastic members 27, but may be symmetrical and may be determined appropriately. As an example, as shown in Fig. 13, the front support elastic members 28 extend from a fifth position E5 to the central region U1 (or the left region U2) and from a sixth position E6 to the central region U1 (or the right region U3) in a pattern in which the acute side crossing angle of the tangent to the front-to-back direction LD continuously decreases, then passes through a single inflection point 28i (or may be a diagonal straight portion), and then the acute side crossing angle of the tangent to the front-to-back direction LD continuously increases, preferably not reaching the crotch region L.

[0085] The position and angle of the inflection point 28i (or straight line portion) can be determined as appropriate, but as shown in FIG. 10, it is preferable that the inflection point 28i (or straight line portion) is located in the central region U1 (or may be located at the center of the width direction WD of the left region U2 and the center of the width direction WD of the right region U3), and that the acute crossing angle θ4 of the tangent (or straight line portion) of the inflection point 28i with respect to the front-to-back direction LD is larger (for example, approximately 5 to 40 degrees) than the acute crossing angle θ3 of the tangent (or straight line portion) of the inflection point 27i of the rear support elastic member with respect to the front-to-back direction LD.

[0086] Furthermore, it is preferable that the force required to stretch one front support elastic member 28 by 150% in the lengthwise direction be smaller than the force required to stretch one rear support elastic member 27 by 150% in the lengthwise direction, but conversely, it is also preferable that the force required to stretch one rear support elastic member 27 by 150% in the lengthwise direction be smaller than the force required to stretch one front support elastic member 28 by 150% in the lengthwise direction. Such a magnitude relationship can be achieved by appropriately selecting at least one of the thickness and material of the front support elastic member 28 and the rear support elastic member 27.

[0087] 14, it is also preferable that the inner edge of the side seal portion 21 adjacent to the waist portion W has a protrusion 21P located closer to the center in the width direction WD than the inner edge of the side seal portion 21 adjacent to the lower waist portion U. By having such a protrusion 21P on the side seal portion 21, the protrusion 21P can be hooked above the wearer's iliac crest, making it difficult for the ends of the rear support elastic members 27 on the first position E1 side and the second position E2 side to slip down when sitting, and making it less likely that the elongation of the rear support elastic members 27 will be hindered (interference with the accumulation of contractile force to assist in standing up).

[0088] As long as the protrusion 21P is provided on the portion of the side seal portion 21 adjacent to the waist portion W, it may be the entire portion adjacent to the waist portion W, the upper end, the lower end, or an intermediate portion therebetween. For example, when multiple rear support elastic members 27 are provided as in the illustrated example, it is preferable that at least one rear support elastic member 27 is located closer to the waist opening WO than the lower edge of the protrusion 21P.

[0089] 15, it is also preferable that the waist region W of the back body B has an anti-slip portion 40 on the inner surface in the range in the width direction WD where the rear support elastic member 27 is located, but that no anti-slip portion 40 is located between the waist region W and the crotch region L. This makes it difficult for the end portions of the rear support elastic member 27 on the first position E1 side and the second position E2 side to slip down when sitting, and makes it difficult for the rear support elastic member 27 to be inhibited from stretching (interfering with the accumulation of contractile force to assist standing up).

[0090] The non-slip portion 40 can be provided by applying or attaching a non-slip material, as in the example shown in Figure 15, or by forming irregularities on the target area by mechanical processing such as embossing. The non-slip material can be a non-slip resin such as rubber, or a material with a high static friction coefficient such as non-woven fabric that has been given non-slip properties by embossing or other irregular processing. When providing the non-slip portion 40 using a non-slip material, it is possible to provide a single non-slip portion 40 that covers the entire target area, but from the perspective of breathability, it is preferable to arrange the non-slip portions 40 in the form of dots or lines at intervals, as in the example shown.

[0091] <Effectiveness verification test> Tests were conducted to confirm the effectiveness of Samples A and B described below in assisting the wearer to stand up.

[0092] The wearers (subjects) were seven men in their 50s.

[0093] (Sample A) A pants-type disposable diaper having the same structure as the pants-type disposable diaper shown in Figures 1 to 11 except that it did not have a rear support elastic member was worn, which was designated as Sample A. In addition to the diaper, only long-sleeved upper body underwear and a robe were worn. Waist elastic material: Spandex thread rubber, thickness 940dtex, stretch rate at installation 280% Lower waist elastic: Spandex thread rubber, thickness 620dtex, stretch rate 300% when attached Elastic material around the legs: Spandex thread rubber, thickness 620 dtex, stretch rate at installation 280%

[0094] (Sample B) Sample B was a pants-type disposable diaper having the same structure as the pants-type disposable diaper shown in Figures 1 to 11, except that the elastic members 24 to 27 were not cut in the middle in the width direction WD but were continuous from one side seal portion 21 to the other side seal portion 21. Rear support elastic material: Natural rubber thread, weight 0.3g / m, elongation rate at installation 280% Other conditions were the same as those for sample A.

[0095] (Measuring equipment and conditions) EMG (electromyogram) was measured using the DataLITE system manufactured by Biometrics, an accelerometer, a joint angle meter, and the analysis software "TRISAS II" manufactured by DKH, and mEMG (mean myoelectric potential) was calculated. The measurement conditions were as follows: Sampling rate: 1000Hz Resolution: 24-bit High-pass filter: 10Hz

[0096] (Measurement procedure) Measurements were taken for each sample using the following procedure. The measurements were taken in two sitting positions: one where the ankle joint angle θ5 shown in Figure 18 was 90 degrees, and the other where it was 70 degrees. The joint angle θ5 was measured using a joint goniometer. (1) Electrodes were attached to the subject's gluteus maximus, vastus medialis, and tibialis anterior muscles (positions with less influence from other muscles). (2) The subjects were fitted with diapers. (3) As shown in Figure 8, chair 65 was placed on a horizontal floor, and participants were asked to stand up straight from a predetermined seated position with the soles of their feet on the floor, and then return to the original seated position. This was repeated four times as one set, and two sets were performed. The time from the start of the standing up movement to the completion of the sitting down movement was within 10 seconds per set. After the first set was completed, the second set was started as soon as the participants were ready to move. EMG was measured from the first standing up movement of the second set to the final sitting down movement. (4) From the EMG measurement results, the mEMG of each muscle was calculated from the standing-up to sitting-down movements during the second, third, and fourth times of the second set, and the sum of these three times was calculated as the average muscle activity.

[0097] (Measurement results) The measurement results for each muscle when the ankle joint angle θ5 in the seated position was set to 90 degrees (the average value and the range up to the maximum value for seven subjects) are shown in Figure 19, and the measurement results for the average muscle activity for each muscle when the ankle joint angle θ5 was set to 70 degrees (the average value and the range up to the maximum value for seven subjects) are shown in Figure 20. These results show that when comparing Samples A and B, the average muscle activity of Sample B is lower, and that Sample B, which has a rear support elastic member, can stand up with less muscle activity than Sample A, which does not have a rear support elastic member.

[0098] <Explanation of terms used in the specification> In the present specification, the following terms have the following meanings unless otherwise specified in the specification. "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. "Front" means the side closest to the wearer's skin, and "reverse" means the side away from the wearer's skin. "Front" means the side closest to the wearer's skin, and "Back" means the side away from the wearer's skin. "Curved" does not include straight lines. "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times. "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. The "thickness" of thick materials such as absorbers is measured using a thickness measuring device (Peacock, large dial thickness gauge, model JB (measurement range 0-35 mm) or model K-4 (measurement range 0-50 mm)) manufactured by Ozaki Seisakusho Co., Ltd., with the sample and thickness measuring device positioned horizontally. 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 10 gf / cm 2 , and pressure area: 2cm 2 Automatic measurement is performed under the following conditions. "Expanded state" means the state in which the material is stretched to its elastic limit (in other words, deployed flat without contraction or slack). "Maximum elongation rate" means the elongation rate in the unfolded state. Unless otherwise specified, the dimensions and relative positions of each part refer to the dimensions and relative positions in the unfolded state, not in the natural length state. 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 23±1°C, relative humidity 50±2%). [Industrial Applicability]

[0099] The present invention can be used for pants-type disposable wearing articles such as the trunks-type disposable diapers and trunks-type sanitary napkins described above. [Explanation of symbols]

[0100] 1...Pants-type disposable diaper, 10...inner body, 11...top sheet, 12...liquid-impermeable sheet, 13...absorbent body, 13N...constricted portion, 14...packaging sheet, 15...gathered sheet, 16...gathered elastic member, 17...diffusion groove, 18...bonding region, 20...outer body, 20C...folded-up portion, 21...side seal portion, 21P...protruding portion, 22...inner sheet layer, 23...outer sheet layer, 24...waist elastic member, 25...lower waist elastic member, 26...leg elastic member, 27...rear support elastic member, 27i...inflection point, 28...front support elastic member, 29...edge of leg opening, 30...leg tube portion, 31...inner thigh portion, 40...anti-slip portion, 60...wearer, B...back portion, B1, B2...adhesive, BS...standing gathers, C1...crossing position, E1...first position, E2...second position, E3...third position, E4...fourth position, E5...fifth position, E6...sixth position, E7...seventh position, E8...eighth position, F...front portion, L...crotch region, L2...left leg region, L3...right leg region, LD...front-to-back direction, LO...leg opening, M...crotch portion, T...torso region, U...lower waist portion, U2...left region, U3...right region, V1...left imaginary line, V2...right imaginary line, V3...imaginary line, V4...imaginary line, W...waist portion, WD...width direction, WO...waist opening.

Claims

1. The garment comprises a front body, a back body, a pair of left and right side seal portions formed by joining both side edges of the front body and both side edges of the back body, respectively, a waist opening, and a pair of left and right leg openings, The front body and the back body each have a torso region defined as a region between the pair of left and right side seal portions, and a crotch region located between edges of the pair of left and right leg openings, The torso regions of the front body and the back body comprise a waist portion extending along the upper edge from the left side seal portion to the right side seal portion, and a lower waist portion adjacent to and below the waist portion and extending from the left side seal portion to the right side seal portion, The waist portion has a waist elastic member, and is elastically stretchable between a natural length state in which the waist portion is contracted in the width direction due to contraction of the waist elastic member and an expanded state in which the waist portion is stretched as the waist elastic member is stretched, The crotch region has a central region defined as a region between a left imaginary straight line along the front-to-rear direction passing through a point on the left edge of the leg opening that is located closest to the center in the width direction and a right imaginary straight line along the front-to-rear direction passing through a point on the right edge of the leg opening that is located closest to the center in the width direction, a left leg-around region defined as a region between the left edge of the leg opening and the left imaginary straight line, and a right leg-around region defined as a region between the right edge of the leg opening and the right imaginary straight line. A pants-type disposable wearing article, the rear body has elongated rear support elastic members extending from a first position located at the boundary between the left side seal portion and the waist portion to at least the left leg region, and from a second position located at the boundary between the right side seal portion and the waist portion to at least the right leg region, each of which approaches the widthwise center and approaches the crotch region; The portion of the rear body where the rear support elastic member is disposed elastically stretches and contracts between a natural length state in which the rear support elastic member is contracted along the rear support elastic member due to contraction of the rear support elastic member, and an expanded state in which the rear support elastic member is stretched along the rear support elastic member as the rear support elastic member is extended. A pants-type disposable wearing article characterized by:

2. The torso region and the crotch region of the front body and the back body have elongated leg elastic members that extend from a third position located on the boundary between the left side seal portion and the lower end of the waist lower portion to at least the left leg region, and from a fourth position located on the boundary between the right side seal portion and the lower end of the waist lower portion to at least the right leg region, approaching the center in the width direction and approaching the crotch region, the portions where the leg elastic members are disposed are elastically stretchable between a natural length state where the portions are contracted along the leg elastic members as the leg elastic members contract, and an expanded state where the portions are stretched along the leg elastic members as the leg elastic members expand, the rear support elastic member extends from the first position to at least a position where it intersects with the leg elastic member of the left leg region, and from the second position to at least a position where it intersects with the leg elastic member of the right leg region, 2. The pants-type disposable wearing article according to claim 1.

3. The waist elastic members are elongated elastic members that are provided at intervals in the front-to-rear direction and extend in the width direction, The rear support elastic members are elongated elastic members provided at intervals in a direction perpendicular to the rear support elastic members, The leg elastic members are elongated elastic members provided at intervals in a direction perpendicular to the leg elastic members, the force required to stretch one waist elastic member 150% in the length direction is equal to or greater than the force required to stretch one rear support elastic member 150% in the length direction, and the number of waist elastic members is greater than the number of rear support elastic members, or the force required to stretch one waist elastic member 150% in the length direction is greater than the force required to stretch one rear support elastic member 150% in the length direction, and the number of waist elastic members is equal to the number of rear support elastic members, the force required to stretch one of the leg elastic members 150% in the lengthwise direction is equal to or greater than the force required to stretch one of the rear support elastic members 150% in the lengthwise direction, and the number of the leg elastic members is greater than the number of the rear support elastic members, or the force required to stretch one of the leg elastic members 150% in the lengthwise direction is greater than the force required to stretch one of the rear support elastic members 150% in the lengthwise direction, and the number of the leg elastic members is equal to the number of the rear support elastic members; 3. The pants-type disposable wearing article according to claim 2.

4. The lower waist portion has a plurality of elongated lower waist elastic members arranged at intervals in the front-to-rear direction and extending along the width direction, and the lower waist portion has the lower waist elastic members and is elastically stretchable between a natural length state in which the lower waist elastic members contract in the width direction due to contraction of the lower waist elastic members and an expanded state in which the lower waist elastic members expand, the force required to stretch one of the lower waist elastic members 150% in the length direction is smaller than the force required to stretch one of the waist elastic members 150% in the length direction, the force required to stretch one of the leg elastic members 150% in the length direction, and the force required to stretch one of the rear support elastic members 150% in the length direction; 4. The pants-type disposable wearing article according to claim 3.

5. the front body has elongated front support elastic members extending from a fifth position located at the boundary between the left side seal portion and the waist portion and from a sixth position located at the boundary between the right side seal portion and the waist portion, each of which approaches the center in the width direction and approaches the crotch region; The portion of the front body where the front support elastic member is disposed elastically expands and contracts between a natural length state where the portion contracts along the front support elastic member due to contraction of the front support elastic member, and an expanded state where the portion stretches along the front support elastic member as the front support elastic member stretches.

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

6. The inner edge of the side seal portion adjacent to the waist portion has a protruding portion located closer to the center in the width direction than the inner edge of the side seal portion adjacent to the waist lower portion.

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

7. The waist portion of the rear body has a non-slip portion on the inner surface of the widthwise range having the rear support elastic member, and no non-slip portion is provided between the waist portion and the crotch region.

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

8. the waist lower portion has a central region defined as a region between the left imaginary line and the right imaginary line, a left region defined as a region between the left imaginary line and the left side seal portion, and a right region defined as a region between the right imaginary line and the right side seal portion, the rear support elastic members extend from the first position through the left region to at least the left leg region and from the second position through the right region to at least the right leg region, in a pattern in which the acute side crossing angle of a tangent to the front-to-rear direction continuously decreases and then passes through one inflection point or a straight line portion, and the acute side crossing angle of a tangent to the front-to-rear direction continuously increases, the inflection point or the straight line portion is located on a widthwise center side of the left region and a widthwise center side of the right region, The acute angle of the tangent to the inflection point or the straight line portion relative to the front-to-rear direction is 5 to 30 degrees.

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

9. An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, and an inner body including an absorbent body, which is fixed to the outer body so as to extend from the front body to the back body, the side seal portions are 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, The exterior body in the front body and the exterior body in the back body each have a portion that forms the torso region and a portion that forms the crotch region, The outer body has the waist elastic member and the rear support elastic member.

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

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