Pants-type disposable diapers

Abstract

To provide a disposable pants-type diaper capable of suppressing a gap generated between the legs of a wearer and leg openings in a simple structure.SOLUTION: A disposable pants-type diaper 1 comprises an outer wrapper 2 including a crotch part 20 for covering the crotch of a wearer M and a pair of leg openings 21 formed on both sides in a width direction W, and an absorption member 3 disposed between a pair of leg openings 21, where the outer wrapper 2 includes leg-opening stretchable members 22 for stretching the pair of leg openings 21, and both side parts 2α and 2β in the width direction W are folded back toward a center O in the width direction W. In the crotch part 20, non-skin-side surfaces 2a of an adhesive area R, the area where the outer wrapper 2 is folded back and overlapped, are releasably boned to each other via adhesive parts 31. Bonding strength of the adhesive parts 31 is set to be higher than stretching stress of the leg-opening stretchable members 22 in a natural resting state and lower than tensile stress generated when the leg-opening stretchable members 22 are stretched to the maximum.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Conventionally, pants-type disposable diapers have been known which have a waist portion that covers the abdomen and buttocks of the wearer and has a waist opening formed at the upper end, and a crotch portion that covers the crotch of the wearer and has a pair of leg openings formed on both sides in the width direction, and which are equipped with an absorbent member provided on the skin-side of the crotch portion (see, for example, Patent Document 1 and Patent Document 2).In addition, absorbent articles have been known which are equipped with tension members that adjust the contraction property around the legs of the wearer (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5352311 [Patent Document 2] Patent No. 4249074 [Patent Document 3] Patent No. 6032665 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to reduce gaps between the wearer's legs and the leg openings, the pants-type disposable diaper disclosed in Patent Document 1 uses releasable adhesive between multiple pleats formed around the periphery of the leg openings. In this case, the adhesive between the pleats is released when the wearer's thighs are inserted into the leg openings, allowing the leg openings to be sized to fit the wearer's thighs. Furthermore, the pants-type disposable diaper disclosed in Patent Document 2 has a configuration in which elastic members are provided in the leg openings and portions of the periphery of the leg openings are divided to serve as fastening tapes for adjusting the leg openings.

[0005] However, the structures disclosed in Patent Documents 1 and 2 for reducing gaps between the leg openings and the wearer's legs are complex and difficult to manufacture. Furthermore, the absorbent article provided with a tension member described in Patent Document 3 also has a complex structure, which causes problems in that it is time-consuming and costly to manufacture.

[0006] The present invention has been made in response to the above-mentioned problems, and aims to provide a pants-type disposable diaper that has a simple structure and can suppress the formation of gaps between the wearer's legs and the leg openings. [Means for solving the problem]

[0007] To achieve the above object, the present invention provides a pants-type disposable diaper comprising an outer shell having a longitudinal direction corresponding to the front-to-back direction of a wearer and a width direction perpendicular to the longitudinal direction, a waist portion covering the abdomen and buttocks of the wearer and having a waist opening at its upper end, and a crotch portion covering the crotch of the wearer and having a pair of leg openings on both sides in the width direction, and an absorbent member provided on the skin-side surface of the crotch portion and positioned between the leg openings. Here, the outer shell is provided with leg-opening elastic members that expand and contract the pair of leg openings, and both sides in the width direction are folded back toward the center in the width direction along fold lines set on both sides in the width direction and extending in the longitudinal direction. Furthermore, the crotch portion is configured such that the non-skin-side surfaces of the adhesive regions, which are overlapping regions where the outer shell is folded back, are releasably bonded together via an adhesive. The adhesive strength of the adhesive is set to be higher than the stretch stress of the leg-opening elastic members in a natural resting state but lower than the tensile stress generated when the leg-opening elastic members are fully extended. [Effects of the Invention]

[0008] As a result, the pants-type disposable diaper of the present invention can suppress the occurrence of gaps between the wearer's legs and the leg-openings with a simple structure. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an external view showing the pants-type disposable diaper of Example 1 when worn. FIG. [Figure 2] 1 is a plan view showing a pants-type disposable diaper according to a first embodiment. [Figure 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] 4 is a cross-sectional view of FIG. 3 taken along line B-B. [Figure 5] 1 is a plan view showing the pants-type disposable diaper of Example 1 in the middle of being put on. FIG. [Figure 6] 6 is a cross-sectional view taken along CC in FIG. 5. [Figure 7] FIG. 10 is a plan view showing a pants-type disposable diaper according to a first modified example. [Figure 8] FIG. 10 is a plan view showing a pants-type disposable diaper according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the pants-type disposable diaper of the present invention will be described based on Example 1 shown in the drawings. In this specification, the direction corresponding to the front-to-back direction of the wearer M, i.e., the direction from the belly side of the wearer M through the crotch area to the back side, is referred to as the longitudinal direction L. The direction perpendicular to the longitudinal direction L is referred to as the width direction W. Furthermore, in this specification, terms such as "up and down," "left and right," and "front and back" are used with the wearer M as the reference.

[0011] The pants-type disposable diaper of Example 1 (hereinafter referred to as "paper pants 1") is used to absorb body fluids such as urine from a wearer M. As shown in FIG. 1, the paper pants 1 include an exterior body 2 and an absorbent member 3.

[0012] The outer body 2 is formed in a so-called pants-like shape and has a cylindrical waist portion 10 that covers the abdomen and buttocks of the wearer M, and a crotch portion 20 that is located below the waist portion 10 and covers the crotch area of ​​the wearer M. The waist portion 10 has a waist opening 11 at its upper end that surrounds the torso of the wearer M. The crotch portion 20 has a pair of leg openings 21 (only one of which is shown in FIG. 1 ) on both sides in the width direction W, into which the legs of the wearer M are inserted.

[0013] The exterior body 2 is composed of a strip-shaped sheet material extending in the longitudinal direction L. The sheet material constituting the exterior body 2 has a front region and a back region defined at both ends in the longitudinal direction L, and a constricted region narrower than the front and back regions defined in the middle in the longitudinal direction L. The sheet material constituting the exterior body 2 is then folded at the center in the longitudinal direction L, and both edges 4 of the front and back regions in the width direction W are joined together to form a pants-like shape. At this time, a waist opening 11 is defined by the edges of the front and back regions. Furthermore, a pair of leg openings 21 are defined by the edges of the constricted region.

[0014] The sheet material constituting the exterior body 2 is liquid-impermeable to prevent body fluids from passing through, and may be, for example, a polyethylene film. The exterior body 2 may be made of a moisture-permeable sheet material without impairing its liquid-impermeability (water-blocking properties) to prevent stuffiness. The non-skin side 2a of the exterior body 2 (the surface that comes into contact with clothing or faces clothing) may be covered with a sheet material such as nonwoven fabric.

[0015] The waist portion 10 is provided with waist elastic members 12. The waist elastic members 12 are made up of a plurality of thread-like elastic material. The elastic material that makes up the waist elastic members 12 extends in the width direction W and is arranged at predetermined intervals in the longitudinal direction L. When the waist elastic members 12 contract, waist gathers are formed at the waist opening 11. The waist gathers fit along the torso of the wearer M wearing the disposable pants 1, preventing leakage of bodily fluids (so-called back leakage and abdominal leakage) from between the wearer M and the disposable pants 1.

[0016] Additionally, leg elastic members 22 are provided in the crotch portion 20. The leg elastic members 22 are made up of a plurality of thread-like elastic material and are arranged around the periphery of the leg openings 21. The elastic material that makes up the leg elastic members 22 extends along the periphery of the leg openings 21 and is arranged at predetermined intervals in the direction away from the leg openings 21. When the leg elastic members 22 contract, the leg openings 21 contract and leg gathers are formed. The leg gathers run along the thighs of a wearer M wearing the disposable pants 1 and prevent leakage of bodily fluids (so-called side leakage) from between the wearer M and the disposable pants 1.

[0017] The elastic material constituting the waist elastic member 12 and the leg elastic member 22 is natural rubber or synthetic rubber, and is stretchable in the length direction. The waist elastic member 12 and the leg elastic member 22 are adhered to the exterior body 2, and are fixed in place by placing a pressing sheet (not shown) on top of them.

[0018] As shown in Figure 1, the absorbent member 3 is provided on the skin side (inner side) of the crotch portion 20, and is positioned between a pair of leg openings 21 to absorb bodily fluids. The absorbent member 3 has a top sheet (not shown), a back sheet (not shown), an absorbent core 3a, and a gathered sheet 3b. The absorbent member 3 is formed by sandwiching the absorbent core 3a between the top sheet and the back sheet, and bonding the peripheral edges of the top sheet and the back sheet. The gathered sheet 3b is positioned on both sides of the absorbent member 3 in the width direction W.

[0019] The top sheet is a sheet material that comes into contact with the skin of the wearer M when wearing the disposable pants 1. The top sheet is made of a liquid-permeable sheet material that allows bodily fluids to pass through, and can be, for example, a perforated or non-perforated nonwoven fabric or a perforated plastic sheet.

[0020] The back sheet is a sheet material that is fixed to the exterior body 2. The back sheet is made of a liquid-impermeable sheet material that does not allow body fluids to pass through, and can be made of the same material as the exterior body 2, for example.

[0021] The absorbent core 3a is formed from materials capable of absorbing and retaining body fluids, including pulp fiber stacks, aggregates of filaments such as cellulose acetate, and nonwoven fabrics. The absorbent core 3a may be formed by mixing, fixing, or otherwise adding particulate or other superabsorbent polymers, as needed. The absorbent core 3a may also contain superabsorbent polymer fibers, or polymer particles or inorganic particles other than superabsorbent polymer particles.

[0022] The gathered sheet 3b is made of a liquid-impermeable sheet material that does not allow bodily fluids to pass through, and can be, for example, a plastic sheet or nonwoven fabric. Thread-like elastic members (not shown) extending in the longitudinal direction L are attached to the gathered sheet 3b. The gathered sheet 3b forms three-dimensional gathers that stand up toward the wearer M due to the contractile force of the elastic members. The three-dimensional gathers run along the groin area of ​​the wearer M wearing the disposable pants 1, preventing leakage of bodily fluids from between the wearer M and the disposable pants 1 (so-called side leakage).

[0023] As shown in FIG. 2 , the outer casing 2 of the disposable pants 1 of Example 1 has fold lines 30 extending in the longitudinal direction L on both sides in the width direction W. The outer casing 2 is folded back at both side portions 2α and 2β in the width direction W toward the center O in the width direction W at each fold line 30. It is desirable that each fold line 30 be set at a position that passes through the lower end 21a of the leg openings 21 when the outer casing 2 is viewed in a plan view. When the fold lines 30 are set at a position that passes through the lower end 21a of the leg openings 21 when viewed in a plan view, the length of the disposable pants 1 in the width direction W can be minimized after folding back the outer casing 2 without folding back the absorbent member 3. In other words, the disposable pants 1 can be made more compact while maintaining the width of the absorbent member 3.

[0024] Furthermore, in the crotch portion 20, in the area where the outer body 2 is folded over and overlaps in a planar view (hereinafter referred to as the "adhesive area R"), the non-skin sides 2a of the outer body 2 are releasably adhered to each other via the adhesive portion 31 (see Figures 3 and 4).

[0025] Here, "peelably bonded" means that the outer body 2 is bonded in such a way that it can be peeled off without being damaged when the non-skin side 2a of the bonded outer body 2 is pulled with a predetermined peel force. Also, since the bonded region R is the region where the outer body 2 is folded over and overlapped in the crotch portion 20, the bonded region R includes the region of the crotch portion 20 where the leg elastic members 22 are provided. In other words, in the disposable pants 1 of Example 1, the non-skin side 2a of the outer body 2 at the positions that overlap the leg elastic members 22 in a plan view are releasably bonded together via the adhesive portion 31.

[0026] The adhesive strength of the adhesive portion 31 is set to be higher than the stretch stress of the leg elastic members 22 in a natural resting state but lower than the tensile stress generated when the leg elastic members 22 are fully extended. The "natural resting state" refers to a state in which the disposable pants 1 are left unattached without being pulled or pressed. Even when the disposable pants 1 are left in a natural resting state, a predetermined stretch stress acts on the leg elastic members 22, causing them to return to their natural length. The adhesive strength of the adhesive portion 31 is set to be sufficient to maintain the adhesive state against this stretch stress. Meanwhile, "maximum extension of the leg elastic members 22" refers to a state in which the leg elastic members 22 are stretched to their maximum length by being pulled. In other words, the adhesive strength of the adhesive portion 31 is set to be sufficient to maintain the adhesive state when the crotch portion 20 is pulled with a force greater than the tensile stress required to fully extend the leg elastic members 22.

[0027] In other words, the adhesive portion 31 does not peel off before the disposable pants 1 are worn, but is set to an adhesive strength such that it peels off when the wearer M's legs are inserted into the leg openings 21 to wear the disposable pants 1 and the leg elastic members 22 are stretched to their maximum elongated state.

[0028] Furthermore, the adhesive portion 31 is made of an adhesive that cannot be re-adhered after being peeled off. In other words, once the adhesive portion 31 is peeled off, it cannot be re-adhered.

[0029] Furthermore, the adhesive region R of Example 1 is provided with a plurality of adhesive portions 31 (three adhesive portions in this example). As shown in FIG. 3, the adhesive portions 31 are each strip-shaped and extend along the longitudinal direction L. The area of ​​each adhesive portion 31 in a plan view is the same. The adhesive portions 31 are arranged in the width direction W at predetermined intervals (constant intervals in this example). Furthermore, the adhesive portions 31 are positioned so far downward that they are positioned further outward in the width direction W.

[0030] The operation of the disposable pants 1 of the first embodiment will be described below.

[0031] In pants-type disposable diapers, leg gathers are usually formed along the periphery of the leg openings or three-dimensional gathers are provided on both sides of the absorbent member to improve the fit around the legs. On the other hand, pants-type disposable diapers are generally selected based on the size of the waist opening. Therefore, even if leg gathers or three-dimensional gathers are provided, for wearers whose waist and leg sizes differ, gaps may occur around the legs or leakage from the legs may not be prevented.

[0032] In other words, if a wearer has a protruding abdomen and chooses disposable pants with a large waist opening, the size around the waist and the leg openings may not match, resulting in gaps around the legs. Also, wearers with legs that are too narrow may find the leg openings to fit poorly, resulting in gaps around the legs.

[0033] Furthermore, when lying on one's side, gaps are particularly likely to occur around the legs, and it is difficult to prevent leakage from around the legs using leg gathers or three-dimensional gathers alone.

[0034] In contrast, in the disposable pants 1 of Example 1, both side portions 2α and 2β of the exterior body 2 in the width direction W are folded back toward the center O of the width direction W at folding lines 30 set on both sides in the width direction W. In the crotch portion 20, the non-skin side surfaces 2a of the exterior body 2 are releasably bonded to each other via adhesive portions 31 in an adhesive region R where the exterior body 2 is folded back and overlapped.

[0035] That is, when the wearer M uses the disposable pants 1, first, as shown in Figure 5, the wearer M spreads both side portions 2α and 2β in the width direction W of the outer cover 2 outward from the fold line 30. Next, the wearer M inserts his / her legs into the leg openings 21 and puts on the disposable pants 1.

[0036] When the legs of the wearer M are inserted into the leg openings 21, as shown in Figure 6, a force f acts on the leg openings 21 from the inside, gradually pushing the leg openings 21 wider. At this time, a tensile stress F that pulls the adhesive joints 31 outward in the width direction W is applied to the adhesive joints 31 depending on the difference between the size of the leg openings and the size of the openings of the leg openings 21. In other words, the greater the difference between the size of the leg openings and the size of the openings of the leg openings 21, the greater the tensile stress F that acts on the adhesive joints 31. When the tensile stress F becomes greater than the tensile stress generated when the leg opening elastic members 22 are fully extended, the adhesive joints 31 peel off.

[0037] At this time, tensile stress F acts from the adhesive joints 31 located on the side of the center O in the width direction W. Therefore, as shown in FIGS. 5 and 6, the folded-over crotch portion 20 gradually peels away from the side of the center O in the width direction W. Furthermore, because the wearer M's feet are inserted into the leg openings 21 from top to bottom, a strong tensile stress acts from above on each adhesive joint 31. Therefore, the adhesive joints 31 gradually peel away from top to bottom.

[0038] When the adhesive portion 31 peels off, the leg openings 21 expand greatly in a circular shape, allowing the wearer M to insert their legs through. Note that, because a portion of the crotch portion 20 of the outer body 2 is adhesively attached, when a tensile stress F acts outward in the width direction W, the leg openings 21 expand greatly in a circular shape, allowing the wearer M to easily insert their legs through.

[0039] As the leg openings 21 widen, the difference between the size of the leg openings and the size of the openings of the leg openings 21 decreases, and the tensile stress F acting on the adhesive joints 31 also decreases. When the tensile stress F becomes smaller than the tensile stress generated when the leg elastic members 22 are at their maximum extension, the adhesive joints 31 do not peel off, and the adhesive state of the crotch part 20 is maintained. This allows the leg openings 21 to be sized to fit the legs of the wearer M, and it is possible to prevent gaps from occurring around the legs of the wearer M.

[0040] That is, in the disposable pants 1 of Example 1, the adhesive portion 31 set in the adhesive region R gradually peels off, allowing the size of the opening of the leg openings 21 to be adjusted. Furthermore, the adhesive region R where the adhesive portion 31 is provided is a region of the crotch portion 20 where both side portions 2α, 2β in the width direction W of the exterior body 2 are folded back and overlapped at the fold line 30. Therefore, by applying the adhesive portion 31 to the non-skin side 2a of the exterior body 2 that constitutes the crotch portion 20 and then folding back the exterior body 2 at the fold line 30, the adhesive region R can be easily adhered.

[0041] As a result, it is possible to prevent gaps from occurring between the legs of the wearer M and the leg openings 21 with a simple structure.

[0042] Furthermore, because the adhesive parts 31 bond the non-skin side surfaces 2a of the outer covers 2 together in the adhesive regions R, they do not impede the stretchability of the leg elastic members 22. This prevents a decrease in the fit of the leg gathers formed by the contraction of the leg elastic members 22.

[0043] Furthermore, the adhesive part 31 is made of an adhesive that cannot be reattached after being peeled off. Therefore, the peeled adhesive part 31 does not stick to the skin or clothes of the wearer M, and the disposable underwear can be worn in the same way as regular disposable pants that do not have adhesive parts 31.

[0044] Furthermore, the disposable pants 1 of Example 1 have a plurality of adhesive sections 31 in the adhesive region R. This makes it possible to partially peel off the adhesive region R of the disposable pants 1, improving the fit of the leg openings 21 around the legs of the wearer M.

[0045] In particular, in the disposable pants 1 of Example 1, the multiple adhesive parts 31 have a band-like shape in plan view extending along the longitudinal direction L, and are arranged at predetermined intervals in the width direction W. As a result, the adhesive parts 31 are discontinuous along the width direction W, and as the adhesive region R peels from the center O side in the width direction W, the adhesive parts 31 can be peeled off in stages. This makes it easier for the disposable pants 1 to stop peeling at the required position according to the size of the wearer M's legs.

[0046] The pants-type disposable diaper of the present invention has been described above based on Example 1, but the specific configuration is not limited to Example 1, and design changes and additions are permitted as long as they do not deviate from the gist of the invention according to each claim.

[0047] In the paper pants 1 of Example 1, an example is shown in which multiple adhesive sections 31 provided in the adhesive region R extend in the longitudinal direction L and are arranged at predetermined intervals in the width direction W. However, the arrangement of the adhesive sections 31 is not limited to this. For example, as in paper pants 1A of a first modified example shown in Figure 7, multiple adhesive sections 31 provided in the adhesive region R may be arranged in a matrix in a plan view at predetermined intervals along the longitudinal direction L and the width direction W.

[0048] That is, the adhesive portion 31 may be discontinuous in both the longitudinal direction L and the width direction W. This makes it easier for peeling to stop at the required position in both the longitudinal direction L and the width direction W of the adhesive portion 31 according to the size of the leg openings of the wearer M, and further improves the fit of the leg openings 21 to the legs of the wearer M.

[0049] Furthermore, by arranging the multiple adhesive sections 31 in a matrix, the adhesive sections 31 can be arranged discontinuously along the longitudinal direction L. This makes it possible to arrange the discontinuous parts of the adhesive sections 31 in positions that do not overlap the leg elastic members 22. Therefore, in the disposable pants 1A of the first modified example, the adhesive sections 31 can be arranged in positions that overlap the leg elastic members 22, and the adhesive sections 31 can be quickly peeled off when a force stronger than the tensile stress generated when the leg elastic members 22 are fully extended is applied.

[0050] Furthermore, in the paper pants 1 of Example 1, an example was shown in which only a plurality of adhesive sections 31 set to the same adhesive strength were arranged in the adhesive region R. However, as in the paper pants 1B of the second modified example shown in Figure 8, the adhesive region R may be releasably adhered via a plurality of adhesive sections 31 and a plurality of strong adhesive sections 32.

[0051] Here, the strong adhesive portions 32 are arranged closer to the center O in the width direction W than the positions of the adhesive portions 31 in the adhesive region R, and peelably bond the end portions of the adhesive region R on the center O side in the width direction W. In the example shown in Fig. 8, the multiple adhesive portions 31 extend in the longitudinal direction L and are arranged at predetermined intervals in the width direction W. The multiple strong adhesive portions 32 extend in the width direction W and are arranged at predetermined intervals in the longitudinal direction L.

[0052] As with the paper pants 1 of Example 1, the adhesive strength of the adhesive portion 31 is set to be higher than the stretching stress of the leg elastic member 22 in a natural resting state, but lower than the tensile stress generated when the leg elastic member 22 is fully stretched.

[0053] On the other hand, the adhesive strength of the strong adhesive portions 32 is set to be higher than the tensile stress that occurs when the leg opening elastic members 22 are stretched to their maximum extent.

[0054] This prevents the adhesive portions 31 from unnecessarily peeling off when, for example, the leg openings 21 are widened before putting on the disposable pants 1B. In other words, the strongly adhesive portions 32 will not peel off even if the leg elastic members 22 are pulled with a force weaker than the tensile stress generated when the leg elastic members 22 are fully extended. This allows the wearer M to place their legs through the leg openings 21 while keeping the crotch portion 20 folded over, and then peel off the strongly adhesive portions 32 after putting their legs through. In other words, the disposable pants 1B of the second modified example prevents the adhesive portions 31 from unnecessarily peeling off while putting on the disposable pants 1B. After putting on the disposable pants 1B, the wearer M will peel off the strongly adhesive portions 32 by strongly pulling on the end of the adhesive region R, located on the center O side in the width direction W. This allows the leg openings 21 to be precisely sized to fit the wearer M's thighs.

[0055] In the first embodiment and the first and second modified examples, examples in which a plurality of adhesive portions 31 are provided in the adhesive region R have been shown, but, for example, adhesive portions 31 may be provided over the entire surface of the adhesive region R, or only one adhesive portion 31 may be provided at any position in the adhesive region R. The position, shape, and size of the adhesive portion 31 may be set arbitrarily. For example, the adhesive portions 31 may be circular in plan view and randomly arranged within the adhesive region R, or a plurality of adhesive portions 31 having a band shape in plan view may be arranged along the width direction W at predetermined intervals in the longitudinal direction L.

[0056] Furthermore, in the disposable pants 1 of Example 1, an example was shown in which the fold line 30 was set at a position that passed through the lower end 21a of the leg openings 21 when the outer body 2 was viewed in a plan view. However, the fold line 30 does not necessarily have to be set at a position that passes through the lower end 21a of the leg openings 21, as long as it was set on both sides of the width direction W of the outer body 2. [Explanation of symbols]

[0057] 1. Disposable pants-type diapers (paper pants) 2. Exterior body 2a Non-skin side 2α, 2β both sides 3 Absorbing material 10 Waist 11 Waist opening 12 Elastic waistband 20 Crotch 21 Leg opening 21a Bottom end 22 Leg expansion member 30 Return line 31 Adhesive part 32 Strong adhesive part R adhesive area

Claims

1. A pants-type disposable diaper comprising an outer body having a longitudinal direction corresponding to the front-to-back direction of a wearer and a width direction perpendicular to the longitudinal direction, a waist portion covering the abdomen and buttocks of the wearer and having a waist opening formed at an upper end thereof, and a crotch portion covering the crotch of the wearer and having a pair of leg openings formed on both sides in the width direction; and an absorbent member provided on the skin side of the crotch portion and disposed between the pair of leg openings, The outer casing is provided with leg-opening expansion members that expand and contract the pair of leg-openings, and both side portions in the width direction are folded back toward the center in the width direction at folding lines that are set on both sides in the width direction and extend in the longitudinal direction, the crotch portion is a region where the outer cover is folded back and overlapped, and non-skin sides of the adhesive region are releasably adhered to each other via an adhesive portion; The adhesive strength of the adhesive portion is set to be higher than the stretching stress of the leg-opening elastic members in a natural resting state, and lower than the tensile stress generated when the leg-opening elastic members are fully stretched. A pants-type disposable diaper characterized by:

2. In the pants-type disposable diaper according to claim 1, The folding line is set at a position that passes through the lower end of the leg opening in a plan view. A pants-type disposable diaper characterized by:

3. In the pants-type disposable diaper according to claim 1 or 2, The adhesive region is provided with a plurality of the adhesive portions. A pants-type disposable diaper characterized by:

4. In the pants-type disposable diaper according to claim 3, The adhesive portions extend along the longitudinal direction and are arranged in the width direction at predetermined intervals. A pants-type disposable diaper characterized by:

5. In the pants-type disposable diaper according to claim 3, The adhesive portions are arranged in a matrix at predetermined intervals along the longitudinal direction and the width direction. A pants-type disposable diaper characterized by:

6. In the pants-type disposable diaper according to any one of claims 1 to 5, The adhesive region is releasably bonded via a strong adhesive portion at a center side in the width direction relative to a position where the adhesive is bonded via the adhesive portion, The adhesive strength of the strong adhesive portion is set to be higher than the tensile stress generated when the leg-hole elastic member is at its maximum extension. A pants-type disposable diaper characterized by:

Images