Pant-type disposable diapers

Abstract

To provide an underpants type disposable diaper which allows a tab part for a post-treatment tape to be easily grasped.SOLUTION: In an underpants type disposable diaper 1 having a post treatment tape 30 provided on a non-skin side of an exterior body 20 which expands and contracts in a width direction W, the post treatment tape 30 has: a belt-like tape body 31 in which a fixing region 33a is fixed to the exterior body 20, and which is folded to spread toward a waist opening part 4; and a tab part 32 provided in a locking region 33c of the tape body 31. The tab part 32 protrudes toward the waist opening part 4 beyond a folding part α. On the exterior body 20, a first region 42a positioned on a side of the post treatment tape 30 and a second region 42b positioned on a side of the waist opening part 4 are set in order in a longitudinal direction L between the folding part α and the waist opening part 4. Expansion and contraction stress in the width direction W of the second region 42b is set to be higher than expansion and contraction stress in the width direction W of the first region 42a.SELECTED DRAWING: Figure 4

Description

Technical Field

[0005] , , , ,

[0001] The present invention relates to a pant-type disposable diaper.

Background Art

[0002] Conventionally, there is known a pant-type disposable diaper having an outer wrapper attached to the non-skin side of an absorbent member for absorbing body fluids, a waist portion in which both side portions in the width direction of the outer wrapper are joined to form a waist opening, and a crotch portion in which a pair of leg openings are formed (see, for example, Patent Document 1 and Patent Document 2).

[0003] In addition, the pant-type disposable diaper is provided with a post-treatment tape used for holding the used diaper in a rolled-up state on the non-skin side of the outer wrapper. The post-treatment tape has a tape body whose one end is fixed to the outer wrapper and a grip portion provided at the other end of the tape body, in a state of being folded so as to be deployable toward the waist opening. Then, when the wearer or caregiver discards the pant-type disposable diaper, by grasping the grip portion and pulling the post-treatment tape to deploy the folded tape body, the portion of the tape body that is not fixed to the outer wrapper is extended.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the tape body and the tab of the post-processing tape are made of a plastic sheet material. When the tape body is folded, the surface of the tab extends parallel to the surface of the outer casing and the tape body, and is also close in the thickness direction. As a result, a gap is unlikely to form between the tab and the outer casing. This made it difficult for the wearer's nails or fingertips to get inside (towards the skin) the tab, and sometimes made it difficult to easily grasp the tab.

[0006] This invention was made in view of the above-mentioned problems, and aims to provide a pant-type disposable diaper in which the tab portion of the post-processing tape can be easily grasped. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a disposable pant-type diaper comprising: an absorbent member extending in the longitudinal direction corresponding to the wearer's abdominal side to the back side and absorbing bodily fluids; an outer body that covers both ends of the absorbent member in the longitudinal direction from the non-skin side closer to the clothing when worn, and is expandable and contractible along the width direction perpendicular to the longitudinal direction; a waist portion that surrounds the wearer's torso and has a waist opening formed at its upper end; and a crotch portion that covers the wearer's crotch and has a pair of leg openings, wherein a post-treatment tape is provided on the non-skin side of the outer body, and the post-treatment tape has a strip-shaped tape body with one end fixed to the outer body and folded so as to be unfoldable toward the waist opening, and a tab provided at the other end of the tape body, wherein the tab protrudes toward the waist opening from the folded portion of the tape body toward the waist opening when folded, and the outer body Of these, the end that covers one of the longitudinal ends of the absorbent member and the end on which the post-treatment tape is provided Between the folded portion and the waist opening, there is a first region located on the post-processing tape side, More than the first region The second region located on the waist opening side is set up in order along the longitudinal direction, and the stretch stress of the second region along the width direction is set to be higher than the stretch stress of the first region along the width direction. Furthermore, the outer casing that covers the other end of the absorbent member in the longitudinal direction, and where the post-treatment tape is not provided, does not have the first and second regions set. This was the structure. [Effects of the Invention]

[0008] As a result, the disposable pant-type diaper of the present invention allows for easy gripping of the tab on the post-processing tape. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram of the disposable pant-type diaper from Example 1, viewed from the non-skin side. [Figure 2] This is an external view of the pant-type disposable diaper of Example 1. [Figure 3] This is an enlarged view of section A in Figure 1. [Figure 4] Figure 3 is a cross-sectional view of BB. [Figure 5] This is an explanatory diagram showing the magnitude of the stretch stress along the width direction in the outer casing of the pant-type disposable diaper of Example 1. [Figure 6] This is a cross-sectional view of the main part of the pant-type disposable diaper of Example 1 when the shirring elastic material is contracted. [Figure 7] This is a magnified view of the main parts of the pant-type disposable diaper of Example 2, as seen from the non-skin side. [Figure 8] This is a cross-sectional view of the main part of the pant-type disposable diaper of Example 2 when the shirring elastic material and the longitudinal elastic material are contracted. [Figure 9] This is an explanatory diagram showing the magnitude of the stretch stress along the width direction in the outer casing of the first modified example of a pant-type disposable diaper. [Modes for carrying out the invention]

[0010] The embodiments for implementing the pant-type disposable diaper according to the present invention will be described as follows based on Embodiment 1 and Embodiment 2 shown in the drawings. In the following description, the direction corresponding to the front side to the back side of the wearer is defined as the "longitudinal direction L", the direction orthogonal to the longitudinal direction L is defined as the "width direction W". Also, the direction orthogonal to both the longitudinal direction L and the width direction W is defined as the "thickness direction H". Further, in the thickness direction H, the side closer to the wearer's body during wearing is defined as the "skin side", and the side closer to the clothes during wearing is defined as the "non-skin side".

[0011] (Embodiment 1) The pant-type disposable diaper of Embodiment 1 (hereinafter referred to as "paper pants 1") includes an absorbent member 10, an outer wrapper 20, and a post-treatment tape 30, as shown in FIG. 1.

[0012] As shown in FIG. 1, the absorbent member 10 has a rectangular shape extending in the longitudinal direction L in a plan view seen from the thickness direction H. The absorbent member 10 contacts the wearer's skin when the paper pants 1 are worn and absorbs body fluids such as urine. That is, the absorbent member 10 has, for example, an absorber containing absorbent polymer particles and pulp fibers, a top sheet and a back sheet sandwiching the absorber, and the like.

[0013] The top sheet is a sheet material disposed on the skin side of the absorber and is permeable to body fluids. The back sheet is a sheet material disposed on the non-skin side of the absorber and blocks the permeation of body fluids.

[0014] The outer wrapper 20 is a sheet material that covers at least both end portions of the absorbent member 10 in the longitudinal direction L from the non-skin side and to which the absorbent member 10 is joined. The outer wrapper 20 of Embodiment 1 extends integrally from the front side to the back side of the wearer. Also, at both end portions in the longitudinal direction L, the outer wrapper 20 extends outward in the width direction W from the absorbent member 10, and the middle portion in the longitudinal direction L is constricted. Then, both side portions 21a, 21b in the width direction W at one end portion (front side) in the longitudinal direction L and both side portions 22a, 22b in the width direction W at the other end portion (back side) in the longitudinal direction L of the outer wrapper 20 are joined by welding or the like, respectively.

[0015] As a result, as shown in FIG. 2, the paper pants 1 are in the form of pants having a waist portion 2 that surrounds the wearer's torso and a crotch portion 3 that covers the wearer's crotch. At the upper end of the waist portion 2, a waist opening 4 for passing through the wearer's torso is formed, and on both sides in the width direction W of the crotch portion 3, a pair of leg openings 5 for passing through the wearer's legs are formed.

[0016] And as shown in FIG. 4, the outer body 20 has an inner sheet material 23a, an outer sheet material 23b, and a shirring elastic material 24 (elastic member) provided therebetween.

[0017] The inner sheet material 23a and the outer sheet material 23b each have liquid impermeability, which is a property of not allowing liquid to permeate. Note that the inner sheet material 23a and the outer sheet material 23b may be constituted by individual sheet materials or may be constituted by a common single sheet material. When the inner sheet material 23a and the outer sheet material 23b are constituted by a single sheet material, for example, a single sheet material is folded back to form the inner sheet material 23a and the outer sheet material 23b.

[0018] The shirring elastic material 24 is an elastic member that can expand and contract along the width direction W, and expands and contracts the outer body 20 along the width direction W. That is, the shirring elastic material 24 is fixed to the inner sheet material 23a and the outer sheet material 23b in a predetermined stretched state, and by contracting and returning to its natural length, integrally contracts the inner sheet material 23a and the outer sheet material 23b. As a result, the outer body 20 is given a stretching and contracting stress along the width direction W by the shirring elastic material 24. Note that the "stretching and contracting stress" is the strength when the member is stretched by the same distance, and a high stretching and contracting stress means that a large stress is required to stretch the member to the same distance. And the magnitude of the stretching and contracting stress of the outer body 20 is determined depending on the magnitude of the stretching and contracting stress of the shirring elastic material 24.

[0019] Furthermore, in Example 1, the shirring elastic material 24 is provided in at least the area of ​​the outer body 20 that forms the waist portion 2 (see Figure 1). As the outer body 20 stretches, the waist portion 2 fits to the wearer's waist. The shirring elastic material 24 is composed of, for example, multiple elongated elastic materials such as elastic threads arranged in parallel in the longitudinal direction L and stretching along the width direction W. However, in addition to elongated elastic materials such as elastic threads, the shirring elastic material 24 can also be made of elastic materials such as strips, meshes, or films.

[0020] Furthermore, the paper pants 1 of Example 1 are provided with an elastic leg material 25 that expands and contracts the outer body 20 along the leg opening 5. In this example, the elastic leg material 25 is composed of multiple elastic threads.

[0021] The post-processing tape 30 is a tape component used to hold the paper pants 1 in a rolled-up state when the used paper pants 1 are disposed of. The post-processing tape 30 is provided on the non-skin side of the other end (back side) in the longitudinal direction L of the outer casing 20 and is positioned in the center in the width direction W.

[0022] The post-processing tape 30 has a tape body 31 and a gripping portion 32, as shown in Figures 3 and 4.

[0023] The tape body 31 is a strip-shaped tape member made of a sheet material of an olefin resin such as polyethylene or polypropylene, or a synthetic resin such as polyvinyl chloride or PET. The tape body 31 has a first fold position 31a and a second fold position 31b set at specific positions in the longitudinal direction. The area from one end 31c in the longitudinal direction of the tape body 31 to the first fold position 31a is the fixed area 33a. The area between the first fold position 31a and the second fold position 31b is the central area 33b. Furthermore, the area from the second fold position 31b to the other end 31d in the longitudinal direction of the tape body 31 is the locking area 33c.

[0024] The tape body 31 is positioned so that the longitudinal direction L of the paper pants 1 coincides with the longitudinal direction of the tape body 31 itself (see Figure 1), and as shown in Figure 4, one end 31c in the longitudinal direction is facing the ventral side, and the skin-facing side of the fixing area 33a is fixed to the outer body 20 via the first adhesive 34a. The first adhesive 34a has sufficient adhesive strength to bond the fixing area 33a to the outer body 20 in a way that makes it impossible to peel off.

[0025] Furthermore, the tape body 31 is folded back toward the non-skin side at the first folding position 31a, so that the central region 33b overlaps the non-skin side of the fixing region 33a. Subsequently, the tape body 31 is folded back toward the skin side at the second folding position 31b, so that the locking region 33c overlaps the non-skin side of the central region 33b, and it is folded into thirds. The central region 33b is also adhered to the fixing region 33a via the first weak adhesive 35a in a way that allows for peeling and re-adhesion. Furthermore, the locking region 33c is also adhered to the central region 33b via the second weak adhesive 35b in a way that allows for peeling and re-adhesion.

[0026] In other words, the tape body 31 is folded so that it can be unfolded along the longitudinal direction L toward the waist opening 4. Furthermore, when the tape body 31 is folded, one end (fixing area 33a) is fixed to the outer casing 20. Also, the locking area 33c can be adhered to the outer casing 20 after the tape body 31 is pulled and unfolded.

[0027] Furthermore, since the tape body 31 is fixed to the outer casing 20 in a tri-fold state, the first folding position 31a becomes the folded portion α on the waist opening 4 side of the folded tape body 31. In other words, the folded portion α is the end of the folded tape body 31 on the waist opening 4 side.

[0028] The tab portion 32 is a tape component that is more visible than the tape body 31 (it is colored in Example 1) and is provided at the other end of the tape body 31 (the tip of the locking region 33c). In Example 1, the tab portion 32 is fixed to the skin side of the locking region 33c via the second adhesive 34b, and as shown in Figure 4, a part of the tab portion 32 is sandwiched between the locking region 33c and the central region 33b. The second adhesive 34b has sufficient adhesive strength to bond the tab portion 32 to the locking region 33c in a way that makes it impossible to peel off.

[0029] Furthermore, the material of the tab portion 32 may be the same as that of the tape body 31, or it may be made of a different material. In addition, as shown in Figures 3 and 4, the tab portion 32 protrudes toward the waist opening 4 from the folded portion α in a plan view. Note that no adhesive is applied to the skin-facing side of the tab portion 32, and it is not adhered to the outer casing 20 and the central region 33b.

[0030] Furthermore, in the paper pants 1 of Example 1, the post-processing tape 30 is provided on the outer body 20, so the waist portion 2 is divided into a lower region 41 on the crotch area 3 side and an upper region 42 on the waist opening 4 side, with the first fold position 31a, which is the folded portion α, as the boundary.

[0031] In this configuration, the shearing expansion members 24 are arranged at regular intervals along the longitudinal direction L in the lower region 41. Therefore, the magnitude of the expansion stress along the width direction W in the lower region 41 is set to be approximately constant regardless of its position along the longitudinal direction L (see Figure 5). Note that the magnitude of the expansion stress along the width direction W in the lower region 41 can be set arbitrarily, and may be set to different magnitudes locally.

[0032] On the other hand, in the upper region 42 between the folded portion α (first folded position 31a) and the waist opening 4, a first region 42a and a second region 42b are set, arranged sequentially along the longitudinal direction L. In Embodiment 1, the first region 42a and the second region 42b are set at the other end (back side) of the outer casing 20 in the longitudinal direction L, and not at one end (ventral side) of the outer casing 20 in the longitudinal direction L. In other words, at one end (ventral side) of the outer casing 20 in Embodiment 1 in the longitudinal direction L, the shearing expansion material 24 is uniformly provided, and the magnitude of the expansion stress along the width direction W is set to be almost uniform across the entire surface (see Figure 1). However, the first region 42a and the second region 42b may be set around the entire circumference of the waist portion 2. Alternatively, the first region 42a and the second region 42b may be set only in the central part of the width direction W (around where the post-processing tape 30 is placed) of the other end (back side) of the outer casing 20 in the longitudinal direction L.

[0033] Furthermore, the boundary between the first region 42a and the second region 42b is not clearly defined, but rather distinguished by the difference in the magnitude of the stretching stress along the width direction W, as described later.

[0034] Furthermore, the first region 42a is located on the post-processing tape 30 side of the second region 42b in a plan view. Also, the first region 42a is not provided with a shearing expansion material 24 and hardly expands or contracts in the width direction W. Therefore, as shown in Figure 5, the first region 42a has almost no expansion or contraction stress along the width direction W.

[0035] The second region 42b is located on the waist opening 4 side of the first region 42a in a plan view. A shearing expansion material 24 is provided in the second region 42b, and the second region 42b is expandable and contractible along the width direction W. In other words, the expansion and contraction stress along the width direction W in the second region 42b is higher than the expansion and contraction stress along the width direction W in the first region 42a.

[0036] Furthermore, the second region 42b is defined as having intermediate regions 43a and a tip region 43b that are arranged sequentially along the longitudinal direction L.

[0037] The intermediate region 43a is the region located on the post-processing tape 30 side (first region 42a side) than the tip region 43b in a plan view. The tip region 43b is the region located on the waist opening 4 side than the intermediate region 43a in a plan view. Furthermore, as shown in Figure 5, the stretch stress along the width direction W in the tip region 43b is set to be lower than the stretch stress along the width direction W in the intermediate region 43a.

[0038] In Example 1, the spacing between the shearing expansion members 24 arranged in parallel in the longitudinal direction L in the tip region 43b is narrower than the spacing between the shearing expansion members 24 arranged in the longitudinal direction L in the intermediate region 43a. In other words, the number of shearing expansion members 24 per unit area is set lower in the tip region 43b than in the intermediate region 43a, resulting in lower expansion stress. However, the magnitude of the expansion stress along the width direction W may be determined not only by the number of shearing expansion members 24 per unit area, but also by varying the thickness, elongation rate, etc., of each shearing expansion member 24.

[0039] The function of paper pants 1 in Example 1 is explained below.

[0040] In Example 1, the paper pants 1 are rolled up with the outer casing 20 facing outwards after use, and the post-treatment tape 30, which is stretched and unfolded by pulling, is wrapped around them. The post-treatment tape 30 adheres to the outer casing 20 through the second weak adhesive 35b applied to the locking area 33c of the tape body 31, maintaining the paper pants 1 in a rolled-up state.

[0041] In the paper pants 1 of Example 1, the tab 32 of the post-processing tape 30 protrudes toward the waist opening 4 more than the folded portion α on the waist opening 4 side of the folded tape body 31. Therefore, as shown in Figure 4, at least the tip of the tab 32 does not overlap with the tape body 31 in a plan view.

[0042] Furthermore, in the paper pants 1 of Example 1, the outer body 20 has, in a plan view, a first region 42a located on the post-processing tape 30 side and a second region 42b located on the waist opening 4 side are sequentially set along the longitudinal direction L between the folded portion α and the waist opening 4. As shown in Figure 5, the stretch stress along the width direction W of the second region 42b is higher than the stretch stress along the width direction W of the first region 42a.

[0043] As a result, when the shearing stretch material 24 returns to its natural length, the outer casing 20 shrinks more in the second region 42b than in the first region 42a, and the length in the width direction W in the second region 42b becomes shorter than in the first region 42a. Therefore, the second region 42b fits inside (towards the skin) of the paper pants 1. On the other hand, in the lower region 41 of the outer casing 20, the rigidity of the part where the tape body 31 of the post-processing tape 30 is fixed becomes higher than the surrounding area, and the deformation of the outer casing 20 is restricted in the part where the tape body 31 is fixed. Furthermore, since the first region 42a has no stretching stress, it can be deformed freely.

[0044] Therefore, when the shearing elastic material 24 contracts and the second region 42b moves into the inside (skin side) of the paper pants 1, the first region 42a folds inward (skin side) of the paper pants 1, starting from the folded portion α, as shown in Figure 6. As a result, the paper pants 1 can create a gap S in the thickness direction H between the outer body 20 and the gripping portion 32. This allows the user to insert their fingertips into the gap S and grasp the gripping portion 32 of the post-processing tape 30, making it easy to grasp the gripping portion 32 of the post-processing tape 30 when disposing of the paper pants 1.

[0045] Furthermore, it is preferable that the first region 42a has low rigidity in order to make it easier to deform (bend). For this reason, the first region 42a may be subjected to processing such as loosening the fibers of the inner sheet material 23a and the outer sheet material 23b.

[0046] Furthermore, in the paper pants 1 of Example 1, a shirring stretch material 24 is provided in the second region 42b to expand and contract the outer casing 20 along the width direction W, while the shirring stretch material 24 is not provided in the first region 42a.

[0047] This makes it possible to increase the difference between the magnitude of the stretch stress along the width direction W in the first region 42a and the magnitude of the stretch stress along the width direction W in the second region 42b (hereinafter referred to as the "stretch stress difference ΔF," see Figure 5). Here, the larger the stretch stress difference ΔF, the greater the deformation of the first region 42a of the outer casing 20. Therefore, the paper pants 1 of Example 1 can widen the gap S by increasing the stretch stress difference ΔF and thus increasing the amount of deformation of the first region 42a. As a result, the paper pants 1 of Example 1 can be made even easier to grasp the grip portion 32.

[0048] Furthermore, in the paper pants 1 of Example 1, the second region 42b is set up such that, in a plan view, an intermediate region 43a located on the first region 42a side and a tip region 43b located on the waist opening 4 side are arranged sequentially along the longitudinal direction L. As shown in Figure 5, the tip region 43b is set up to have lower stretch stress along the width direction W than the intermediate region 43a.

[0049] Therefore, the paper pants 1 of Example 1 can reduce the tightness of the waist portion 2 in the tip region 43b compared to the intermediate region 43a. As a result, the paper pants 1 of Example 1 can maintain a stretch stress difference ΔF by increasing the stretch stress along the width direction W in the intermediate region 43a, while suppressing the narrowing of the waist opening 4 and thus preventing deterioration of wearability.

[0050] In other words, for example, if the stretch stress along the width direction W in the second region 42b is constant over the entire length direction L, then increasing the stretch stress along the width direction W in the second region 42b as a whole can increase the stretch stress difference ΔF. However, at the same time, the tightening of the waist portion 2 in the tip region 43b will also increase, raising concerns that the waist opening 4 will narrow. Therefore, it is conceivable that wearability will deteriorate. On the other hand, if the stretch stress along the width direction W in the second region 42b is reduced as a whole in order to alleviate the tightening of the waist portion 2 in the tip region 43b, it will not be possible to secure a sufficient stretch stress difference ΔF. Therefore, it is thought that the first region 42a will be less likely to deform, and gaps S will be less likely to occur.

[0051] In the first embodiment, the paper pants 1 have an intermediate region 43a located on the side of the first region 42a in the second region 42b, and a tip region 43b located on the side of the waist opening 4, which has lower stretch stress in the width direction W than the intermediate region 43a. This makes it possible to widen the gap S into which the user's fingertips can be inserted and to make the paper pants 1 easy to wear.

[0052] (Example 2) The disposable pant-type diaper in Example 2 (hereinafter referred to as "paper pant 1A") is equipped with an absorbent material 10, an outer casing 20, and a post-treatment tape 30, similar to the paper pant 1 in Example 1.

[0053] Furthermore, as shown in the enlarged view of the main parts in Figure 7, the paper pants 1A of Example 2 has, in addition to the configuration of the paper pants 1 of Example 1, a longitudinal stretchable material 50 (second stretchable member) that expands and contracts along the longitudinal direction L is provided in the first region 42a.

[0054] Here, the longitudinal stretch material 50 is a rubber thread arranged along the longitudinal direction L, and is fixed to the inner sheet material 23a and the outer sheet material 23b in a predetermined stretched state. When the longitudinal stretch material 50 contracts and returns to its natural length, the region of the first region 42a in which the longitudinal stretch material 50 is provided (hereinafter referred to as the "arrangement region 51") contracts along the longitudinal direction L.

[0055] Furthermore, the placement area 51 is set to be the area within the first area 42a that lies on the extension of the post-processing tape 30 in the longitudinal direction L, that is, the area where the position of the post-processing tape 30 and the width direction W coincide. Note that the vertical expansion material 50 only needs to be placed in the area within the first area 42a that lies on the extension of the post-processing tape 30 in the longitudinal direction L (placement area 51), and may, for example, be placed over the entire area of ​​the first area 42a.

[0056] Furthermore, in the lower region 41, the portion where the tape body 31 of the post-processing tape 30 is fixed has higher rigidity than its surroundings, thus restricting deformation of the outer casing 20. For this reason, the vertical expansion material 50 may be positioned so as to overlap the lower region 41 on the crotch lower part 3 side of the folded portion α in a plan view.

[0057] Furthermore, in the paper pants 1A of Example 2, the first region 42a is contracted by the longitudinal stretch material 50, so as shown in Figure 8, the boundary position K between the first region 42a and the second region 42b can be pulled toward the post-processing tape 30. As a result, the paper pants 1A of Example 2 can extend the second region 42b further into the inside (skin side) of the paper pants 1 than when the longitudinal stretch material 50 is not provided, thereby widening the gap S.

[0058] The disposable pant-type diapers of the present invention have been described above based on Examples 1 and 2. However, the specific configuration is not limited to these examples, and changes or additions to the design are permitted as long as they do not depart from the gist of the invention as described in each claim.

[0059] In the paper pants 1 of Example 1, an example was shown in which the second region 42b was divided into an intermediate region 43a and a tip region 43b with different stretch stresses along the width direction W. However, it is not necessary for the intermediate region 43a and the tip region 43b to be separated. That is, as shown in Figure 9, the stretch stress along the width direction W in the second region 42b may be set to decrease continuously as you move from the first region 42a towards the waist opening 4.

[0060] In this case, in the second region 42b, the stretch stress along the width direction W gradually decreases toward the waist opening 4, so there is no localized change in the tightening force at the waist 2. For this reason, paper pants in which the stretch stress along the width direction W of the second region 42b is continuously reduced can reduce discomfort when worn.

[0061] Furthermore, in order to continuously reduce the expansion and contraction stress along the width direction W in the second region 42b toward the waist opening 4, for example, the spacing of the shearing expansion members 24 arranged in the second region 42b in the longitudinal direction L is gradually widened toward the waist opening 4.

[0062] Furthermore, in the paper pants 1 of Example 1, the shearing expansion material 24 is not placed in the first region 42a in order to increase the difference in expansion stress ΔF. However, if the expansion stress along the width direction W of the second region 42b is set to be higher than the expansion stress along the width direction W of the first region 42a, the shearing expansion material 24 may also be placed in the first region 42a. [Explanation of Symbols]

[0063] 1. Paper pants (disposable diapers in the style of pants) 2 Waist area 3. Inseam 4 Waist opening 5. Underbody opening 10 Absorbing material 20 Exterior 24. Shearing stretch material (first stretch member) 30 Post-processing tape 31 Tape body 32. Thumb part 42a 1st area 42b 2nd area α folded part L Longitudinal direction W (width direction) H thickness direction

Claims

1. An absorbent material that extends longitudinally from the wearer's ventral to dorsal side and absorbs bodily fluids, The absorbent member comprises an outer casing that covers both ends in the longitudinal direction of the absorbent member from the non-skin side, which is closer to the clothing when worn, and is expandable and contractible along the width direction perpendicular to the longitudinal direction, A pant-type disposable diaper having a waist portion that surrounds the wearer's torso and has a waist opening at its upper end, and a crotch portion that covers the wearer's crotch and has a pair of leg openings, A post-treatment tape is provided on the non-skin side of the exterior body. The post-processing tape comprises a strip-shaped tape body, one end of which is fixed to the outer casing and folded so as to be unfoldable toward the waist opening, and a tab provided at the other end of the tape body. The aforementioned tab protrudes toward the waist opening from the folded portion of the tape body on the waist opening side when folded, Of the outer casing, the end covering one end of the absorbent member in the longitudinal direction and on which the post-processing tape is provided has a first region located on the post-processing tape side and a second region located on the waist opening side of the first region, which are arranged sequentially along the longitudinal direction between the folded portion and the waist opening. The stretch stress along the width direction of the second region is set to be higher than the stretch stress along the width direction of the first region. Of the outer casing, the end that covers the other end of the absorbent member in the longitudinal direction and where the post-treatment tape is not provided does not have the first region and the second region set. A pant-type disposable diaper characterized by the following features.

2. In the disposable pant-type diaper described in claim 1, The second region is provided with an expandable / contractible member that expands and contracts the exterior body along the width direction, while the first region is not provided with the expandable / contractible member. A pant-type disposable diaper characterized by the following features.

3. In the pant-type disposable diaper described in claim 1 or claim 2, In the first region, at least in the region along the longitudinal extension of the post-processing tape, a second expandable member that expands and contracts along the longitudinal direction is provided, and the second expandable member is not provided in the second region. A pant-type disposable diaper characterized by the following features.

4. In the disposable pant-type diaper described in claim 1 or claim 2, The second region includes an intermediate region located on the side of the first region and a tip region located on the side of the waist opening, which has lower stretch stress in the width direction than the intermediate region, arranged sequentially along the longitudinal direction. A pant-type disposable diaper characterized by the following features.

5. In the disposable pant-type diaper described in claim 1 or claim 2, The stretching stress along the width direction of the second region decreases continuously as you move from the first region toward the waist opening. A pant-type disposable diaper characterized by the following features.

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