Pants-type disposable diapers

Abstract

To provide an underpants-type disposable diaper able to easily fold back a waistline part along the width direction.SOLUTION: An underpants-type disposable diaper 10 includes a ventral part 1, a dorsal part 2 and a crotch part 3 located between the ventral part 1 and the dorsal part 2, where a direction heading for the dorsal part 2 from the ventral part 1 through the crotch part 3 is defined as a longitudinal direction D1, and a direction orthogonal to the longitudinal direction D1 is defined as the width direction D2. The underpants-type disposable diaper includes a cylindrical waistline part 5 formed by joining side seal parts 4a of width-direction D2 both sides of the ventral part 1 and side seal parts 4b of width-direction D2 both sides of the dorsal part 2. The waistline part 5 includes a foldback portion 20 extending along the width direction D2, formed at an intermediate position in the longitudinal direction D1 and served as a starting point of folding of the waistline part 5.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, there has been known a pants-type disposable diaper having a ventral portion, a dorsal portion, and a crotch portion located between the ventral portion and the dorsal portion, and in which both widthwise sides of the ventral portion and both widthwise sides of the dorsal portion are joined to form a tubular waist portion (see, for example, Patent Documents 1 and 2). In the conventional pants-type disposable diaper, a pair of folds extending in the width direction is provided in the waist portion. The pair of folds are then folded in opposite directions to form pleats on the outer surface of the waist portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6169467 [Patent Document 2] Patent No. 6467214 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when wearing a pants-type disposable diaper, the waist portion is generally shortened by folding or rolling along the width direction so that the wearer can easily insert his / her legs in. However, in conventional pants-type disposable diapers, although it is possible to pull up the waist portion by grasping the pleats formed on the outer peripheral surface of the waist portion, there is a problem that it is difficult to fold the waist portion.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a pants-type disposable diaper whose waist portion can be easily folded along the width direction. [Means for solving the problem]

[0006] In order to achieve the above object, the pants-type disposable diaper of the present invention has a ventral portion, a dorsal portion, and a crotch portion located between the ventral portion and the dorsal portion, the direction from the ventral portion through the crotch portion toward the dorsal portion being the longitudinal direction, and the direction perpendicular to the longitudinal direction being the width direction, and the pants-type disposable diaper is provided with a tubular waist portion formed by joining both side portions in the width direction of the ventral portion and both side portions in the width direction of the dorsal portion, and the waist portion has a folding portion formed at a middle position in the longitudinal direction, which extends along the width direction and serves as a starting point for folding the waist portion. The bent portion has a first bent portion formed between a central position between an upper end of the waist portion and an end of the absorbent pad in the longitudinal direction, the end being disposed inside the crotch portion, and the end of the absorbent pad. It is characterized by: Effect of the Invention

[0007] In the pants-type disposable diaper of the present invention thus constructed, the waist portion can be easily folded along the width direction. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a pants-type disposable diaper of a first embodiment. [Diagram 2] FIG. 1 is a development view showing a pants-type disposable diaper of Example 1. [Diagram 3] FIG. 3 is an explanatory diagram showing a schematic cross section taken along the line AA in FIG. 2. [Figure 4A] FIG. 2 is an explanatory diagram showing a schematic diagram of an absorbent pad attached to the pants-type disposable diaper of Example 1. [Figure 4B] FIG. 2 is an explanatory view showing a schematic diagram of the pants-type disposable diaper of Example 1 in a folded state at a first folding portion. [Figure 4C] FIG. 2 is an explanatory view showing a schematic diagram of the pants-type disposable diaper of Example 1 in a state where a second fold portion is folded. [Diagram 5] FIG. 1 is a front view showing a pants-type disposable diaper of a first embodiment. [Figure 6] FIG. 11 is a perspective view showing a pants-type disposable diaper according to a second embodiment. [Figure 7] FIG. 1 is a development view of a pants-type disposable diaper according to a second embodiment. [Figure 8A] FIG. 2 is an explanatory cross-sectional view showing a pants-type disposable diaper according to a first modified example. [Figure 8B] FIG. 11 is an explanatory cross-sectional view showing a pants-type disposable diaper according to a second modified example. [Figure 8C] FIG. 13 is an explanatory cross-sectional view showing a pants-type disposable diaper according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a pants-type disposable diaper according to the present invention will be described with reference to Examples 1 and 2 shown in the drawings.

[0010] Example 1 The pants-type disposable diaper in Example 1 (hereinafter referred to as "diaper 10") has a ventral portion 1, a dorsal portion 2, and a crotch portion 3 located between the ventral portion 1 and the dorsal portion 2, as shown in Figures 1 and 2. In this specification, the direction from the ventral portion 1 through the crotch portion 3 toward the dorsal portion 2 is defined as a longitudinal direction D1, and the direction perpendicular to the longitudinal direction D1 is defined as a width direction D2. In the following description, terms such as "upper and lower", "left and right", and "front and back" are used based on a wearer M who wears the diaper 10.

[0011] The diaper 10 has side seal portions 4a on both sides of the abdominal portion 1 in the width direction D2 and side seal portions 4b on both sides of the dorsal portion 2 in the width direction D2 joined together to form a tubular waist portion 5 and a pair of leg insertion openings 6. When wearing the diaper 10, the wearer M inserts his / her legs M1, M2 into the pair of leg insertion openings 6, respectively, and the abdomen and back are covered by the waist portion 5.

[0012] As shown in Fig. 3, the diaper 10 includes an exterior back sheet 11, a top sheet 12 laminated on the exterior back sheet 11, and an absorbent body 13 provided between the exterior back sheet 11 and the top sheet 12. The exterior back sheet 11 is a sheet material that is placed on the clothing side when the diaper 10 is worn, and is formed, for example, of a nonwoven fabric that is impermeable to liquid. The top sheet 12 is a sheet material that is placed on the skin side of the wearer M when the diaper 10 is worn, and is formed, for example, of a nonwoven fabric that is permeable to liquid. The absorbent body 13 is composed of an absorbent polymer and pulp that have liquid retention properties, and is disposed at a position corresponding to the crotch portion 3.

[0013] The waist portion 5 of the diaper 10 is provided with a plurality of elastic members 14 that are elastic in the width direction D2. Each elastic member 14 may be, for example, a thread-like or strip-like natural rubber. The elastic members 14 are arranged at predetermined intervals along the longitudinal direction D1 of the waist portion 5, and are sandwiched between the top sheet 12 and the gather pressing sheet 15 to be held in a predetermined stretched state. The gather pressing sheet 15 is a sheet material formed, for example, of a liquid-permeable nonwoven fabric, and is fixed to the surface of the top sheet 12 (the surface facing the skin of the wearer M).

[0014] In the diaper 10 of Example 1, a first region 7 and a second region 8 are defined in the waist region 5, and the stretching stress of the elastic member 14 disposed in the first region 7 is set to be higher than the stretching stress of the elastic member 14 disposed in the second region 8. Here, the "first region 7" refers to a region from the upper end portion 5a of the waist region 5 to a first folded portion 21 described below. In other words, the first region 7 is a region closer to the upper end portion 5a of the waist region 5 than the first folded portion 21. In addition, the "second region 8" refers to a region from the first folded portion 21 to the leg insertion opening 6. In other words, the second region 8 is a region closer to the crotch portion 3 than the first folded portion 21.

[0015] The "stretching stress of the elastic members 14" refers to the total stretching stress obtained by adding up the stretching stresses of the multiple elastic members 14 arranged in the first region 7 or the second region 8. That is, in the diaper 10 of Example 1, the elastic members 14 arranged in the first region 7 and the elastic members 14 arranged in the second region 8 are made of the same elastic material, and the stretching stresses of the elastic members 14 are set to be equal. Furthermore, more elastic members 14 are arranged in the first region 7 than in the second region 8. As a result, in the diaper 10, the total stretching stress of the multiple elastic members 14 arranged in the first region 7 is higher than the total stretching stress of the multiple elastic members 14 arranged in the second region 8.

[0016] The diaper 10 is not limited to the above configuration, as long as the total stretching stress of the multiple elastic members 14 arranged in the first region 7 is higher than the total stretching stress of the multiple elastic members 14 arranged in the second region 8. For example, the first region 7 may have the same number of elastic members 14 as the second region 8, and the stretching stress of each of the multiple elastic members 14 arranged in the first region 7 may be set higher than the stretching stress of each of the multiple elastic members 14 arranged in the second region 8.

[0017] Furthermore, the diaper 10 of Example 1 has a back leakage prevention sheet 16 provided along the upper end 5a of the waist portion 5. The back leakage prevention sheet 16 is a sheet material formed of, for example, a strip-shaped nonwoven fabric having liquid permeability. The back leakage prevention sheet 16 is arranged at both end edges in the longitudinal direction D1 of the diaper 10, and is fixed to the surface of the gather pressing sheet 15 (the surface facing the skin of the wearer M).

[0018] 2, the diaper 10 of Example 1 is generally used with an absorbent pad 17 disposed on the inside of the crotch portion 3 (on the surface of the topsheet 12). Like the diaper 10, the absorbent pad 17 comprises a liquid-permeable topsheet 17a, an absorber 17b, and a liquid-impermeable backsheet 17c, which are arranged in this order from the skin side to the clothing side of the wearer M. The diaper 10 and the absorbent pad 17 may each have three-dimensional gathers that fit along the groin of the wearer M.

[0019] In the diaper 10 of Example 1, a fold portion 20 extending along the width direction D2 is formed in the waist portion 5. The fold portion 20 is a portion where the rigidity of the waist portion 5 differs from that of the region surrounding the fold portion 20 (hereinafter referred to as the "general portion of the waist portion 5"), and serves as a starting point when the waist portion 5 is folded along the width direction D2. Note that in the fold portion 20 of Example 1, the rigidity of the waist portion 5 is reduced compared to that of the general portion of the waist portion 5.

[0020] In the diaper 10 of Example 1, two folding portions 20 are provided at a predetermined interval along the longitudinal direction D1 of the waist portion 5. That is, the folding portion 20 of Example 1 has a first folding portion 21 arranged at a middle position in the longitudinal direction D1 of the waist portion 5, and a second folding portion 22 arranged closer to the crotch portion 3 (at a position farther from the upper end portion 5a of the waist portion 5) than the first folding portion 21. The first folding portion 21 and the second folding portion 22 are both formed due to the difference in the number of sheet materials laminated on the exterior backsheet 11, that is, the difference in thickness of the diaper 10.

[0021] Specifically, the first folded portion 21 is formed by the difference in thickness between the area where the gather pressing sheet 15 is arranged and the area where the back leakage prevention sheet 16 is laminated on the gather pressing sheet 15. That is, the first folded portion 21 is along the lower edge 16a of the back leakage prevention sheet 16. The second folded portion 22 is formed by the difference in thickness between the area where the topsheet 12 is arranged and the area where the gather pressing sheet 15 is laminated on the topsheet 12. That is, the second folded portion 22 is along the lower edge 15a of the gather pressing sheet 15.

[0022] The first bent portion 21 is formed from a central position S between the upper end portion 5a of the waist portion 5 and the end portion 17d in the longitudinal direction D1 of the absorbent pad 17 to the end portion 17d of the absorbent pad 17, that is, between the central position S and the end portion 17d. The central position S is set based on a standard attachment position when the absorbent pad 17 is attached to the diaper 10. In the first embodiment, the first bent portion 21 is formed at a position 50 mm to 180 mm downward from the upper end portion 5a of the waist portion 5.

[0023] Also, the second folding portion 22 is formed at a position away from the first folding portion 21 by a distance equivalent to the distance from the first folding portion 21 to the central position S. That is, the position at which the second folding portion 22 is formed is set at a position where the waist portion 5 can be folded along the central position S when the waist portion 5 is folded starting from the second folding portion 22. In the first embodiment, the second folding portion 22 is formed at a position 50 mm to 100 mm below the first folding portion 21, and the distance from the first folding portion 21 to the second folding portion 22 is set in the range of 50 to 100 mm. Note that the "equivalent distance" includes not only the same distance as the distance from the first folding portion 21 to the central position S, but also a distance within a predetermined range of error.

[0024] The operation of the pants-type disposable diaper 10 of the first embodiment will be described below.

[0025] To wear the diaper 10 of Example 1, the wearer M first attaches the absorbent pad 17 to the inside of the diaper 10 as shown in Fig. 4A. The absorbent pad 17 is attached to approximately the center of the diaper 10 in the longitudinal direction D1 (a position corresponding to the crotch part 3). The attachment position of the absorbent pad 17 can be shifted forward or backward from the standard attachment position.

[0026] Next, the wearer M folds the upper end portion 5a of the waist portion 5 of the diaper 10 toward the inside of the diaper 10, as shown in FIG. 4B. Here, a first fold portion 21 is formed at the middle position of the waist portion 5, which serves as a starting point when folding the waist portion 5 along the width direction D2. Therefore, the wearer M can easily fold the waist portion 5 starting from the first fold portion 21. Furthermore, since the rigidity of the waist portion 5 is reduced by the first fold portion 21, the folding position of the waist portion 5 is determined by the first fold portion 21. As a result, in the diaper 10 of the first embodiment, the folding position of the waist portion 5 is unlikely to deviate from the position where the first fold portion 21 is formed, and the wearer M can fold the waist portion 5 parallel to the width direction D2.

[0027] Furthermore, in the diaper 10 of Example 1, the waist portion 5 is folded at the position where the first fold portion 21 is formed, so that the end portion 17d of the absorbent pad 17 in the longitudinal direction D1 can be sandwiched by the waist portion 5. Therefore, the diaper 10 can prevent the end portion 17d of the absorbent pad 17 from protruding and becoming an obstacle when the wearer M inserts the feet M1, M2 into the leg insertion opening 6.

[0028] In particular, in the diaper 10 of Example 1, the first fold portion 21 is formed between the center position S between the upper end portion 5a of the waist portion 5 and the end portion 17d of the absorbent pad 17, and the end portion 17d of the absorbent pad 17. Therefore, as shown in Fig. 4B, when the waist portion 5 is folded inward of the diaper 10 starting from the first fold portion 21, the waist portion 5 can overlap the end portion 17d of the absorbent pad 17. This allows the diaper 10 to appropriately prevent the absorbent pad 17 from protruding out.

[0029] Furthermore, the diaper 10 of Example 1 can ensure a gap between the end 17d of the absorbent pad 17 and the first folding portion 21. Therefore, when the waist portion 5 is folded starting from the first folding portion 21, the absorbent pad 17 is not folded together with the waist portion 5. This prevents the absorbent pad 17 from being folded together with the waist portion 5, and allows the wearer M to easily fold the waist portion 5.

[0030] Furthermore, in the diaper 10 of Example 1, the stretching stress of the elastic members 14 arranged in the first region 7 of the waist portion 5 is higher than the stretching stress of the elastic members 14 arranged in the second region 8. Therefore, in the diaper 10, the first region 7, which is closer to the upper end portion 5a of the waist portion 5 than the first fold portion 21, shrinks more than the second region 8, as shown in Fig. 5. As a result, the upper end portion 5a of the waist portion 5 is pulled toward the inside of the diaper 10 by the elastic members 14 arranged in the first region 7, allowing the wearer M to more easily fold the upper end portion 5a of the waist portion 5 toward the inside of the diaper 10.

[0031] Next, the wearer M folds the waist portion 5 of the diaper 10 toward the outside of the diaper 10, as shown in FIG. 4C. Here, the waist portion 5 is formed with a second fold portion 22 that serves as a starting point when folding the waist portion 5 along the width direction D2. Therefore, the wearer M can easily fold the waist portion 5 starting from the second fold portion 22. In addition, since the rigidity of the waist portion 5 is reduced by the second fold portion 22, the folding position of the waist portion 5 is determined by the second fold portion 22. As a result, in the diaper 10 of the first embodiment, the folding position of the waist portion 5 is unlikely to deviate from the position where the second fold portion 22 is formed, and the wearer M can fold the waist portion 5 parallel to the width direction D2.

[0032] Moreover, both end portions 17d of the absorbent pad 17 in the longitudinal direction D1 are sandwiched in the waist portion 5 in advance. Therefore, when the waist portion 5 is folded starting from the second folding portion 22, the absorbent pad 17 is folded outward of the diaper 10 together with the waist portion 5 with both end portions 17d sandwiched in the waist portion 5. This makes it possible to shorten the length of the waist portion 5 in the longitudinal direction D1 while preventing both end portions 17d of the absorbent pad 17 from being exposed. Therefore, the diaper 10 makes it possible to prevent the absorbent pad 17 from interfering with the insertion of the feet M1, M2 into the leg insertion opening 6, and allows the wearer M to easily insert the feet M1, M2.

[0033] In particular, in the diaper 10 of Example 1, the second fold 22 is formed at a position away from the first fold 21 by a distance equal to the distance from the first fold 21 to the central position S. Therefore, as shown in Fig. 4C, when the waist portion 5 is folded outward from the diaper 10 starting from the second fold 22, the wearer M can maintain a state in which the waist portion 5 presses the absorbent pad 17. This prevents the upper end portion 5a of the waist portion 5 from spreading out, thereby preventing both end portions 17d of the absorbent pad 17 from being exposed.

[0034] Then, the wearer M inserts the legs M1, M2 into the leg insertion openings 6, and then pulls up the diaper 10. At this time, the wearer M holds the upper end portion 5a of the waist portion 5 and pulls the diaper 10, so that the waist portion 5 easily unfolds and fits along the abdomen and back of the wearer M. This allows the wearer M to easily put on the diaper 10.

[0035] Example 2 6, a pants-type disposable diaper in Example 2 (hereinafter referred to as "diaper 10A") has a plurality of elastic members 14 arranged in a waist portion 5, and a fold portion 20 having a first fold portion 21 and a second fold portion 22 formed in the waist portion 5. Similarly to Example 1, a first region 7 that is a region from an upper end portion 5a of the waist portion 5 to the first fold portion 21, and a second region 8 that is a region from the first fold portion 21 to the crotch portion 3 are defined in the waist portion 5.

[0036] In the diaper 10A of Example 2, the arrangement direction of the multiple elastic members 14 is different from that of Example 1. Other configurations are similar to those of Example 1, and therefore detailed description will be omitted.

[0037] 6 and 7, the multiple elastic members 14 of Example 2 are arranged along the folds 20 (the first folds 21 and the second folds 22) in a central region α of the first region 7 set in the waistband portion 5, the central region α facing the abdomen and back of the wearer M. In other words, the arrangement direction of the elastic members 14 in the central region α of the first region 7 is set parallel to the width direction D2.

[0038] Furthermore, in the side region β of the first region 7 set in the waistline portion 5 that faces the flanks of the wearer M, the multiple stretchable members 14 are arranged diagonally from the joining position γ (side seal portions 4a, 4b) where the abdominal portion 1 and the back portion 2 are joined toward the upper end portion 5a of the waistline portion 5. In other words, the arrangement direction of the stretchable members 14 in the side region β of the first region 7 is set so as to gradually slope diagonally upward from the boundary position between the central region α and the side region β toward the side seal portions 4a, 4b.

[0039] Furthermore, the multiple elastic members 14 are arranged along the folds 20 (the first folds 21 and the second folds 22) in the entire central region α and the side regions β in the second region 8 set in the waistband portion 5. That is, the arrangement direction of the elastic members 14 in the second region 8 is set parallel to the width direction D2.

[0040] Thus, in the diaper 10A of Example 2, in the first region 7 of the waist region 5, the elastic members 14 are arranged along the folds 20 in the central region α, and in the side regions β, the elastic members 14 are arranged so as to gradually incline obliquely upward from the joining position γ. Therefore, in the side regions β, the exterior backsheet 11 is pulled toward the inside of the diaper 10A by the elastic members 14. This makes the side regions β of the first region 7 more likely to collapse toward the inside of the diaper 10A starting from the first folds 21, and the wearer M can easily fold the waist region 5 inward starting from the first folds 21.

[0041] On the other hand, in the diaper 10A of Example 2, in the second region 8 of the waist portion 5, a plurality of elastic members 14 are arranged along the fold portions 20 (the first fold portion 21 and the second fold portion 22) all around the waist portion 5. Therefore, in the second region 8, the waist portion 5 is not pulled inwardly of the diaper 10A by the elastic members 14. Therefore, as shown in FIG. 4C, for example, when the wearer M folds the waist portion 5 toward the outside of the diaper 10A starting from the second fold portion 22, the elastic stress of the elastic members 14 is prevented from interfering with the folding action of the wearer M.

[0042] The pants-type disposable diaper of the present invention has been described above based on Examples 1 and 2. However, the specific configuration is not limited to these Examples, and design changes, combinations of the Examples, additions, etc. are permitted as long as they do not deviate from the gist of the invention according to each claim in the scope of the claims.

[0043] In the diaper 10 of Example 1, the first folded portion 21 and the second folded portion 22 are both formed by the difference in the number of sheet materials laminated on the exterior back sheet 11. However, the configuration for forming the folded portion 20 is not limited thereto.

[0044] For example, as in a diaper 10B of a first modified example shown in Fig. 8A, the back leakage prevention sheet 16 and the gather pressing sheet 15 may be divided into a plurality of parts along the longitudinal direction D1 by slits 15b, 16b extending in the width direction D2. In this case, the thickness of the waist part 5 is reduced at the position where the slit 16b is formed in the back leakage prevention sheet 16, and therefore the slit 16b forms a first folded part 21. The thickness of the waist part 5 is also reduced at the position where the slit 15b is formed in the gather pressing sheet 15. Therefore, the slit 15b forms a second folded part 22.

[0045] That is, the bent portions 20 may be formed by intermittently arranging the sheet materials (gather pressing sheet 15 and back leakage prevention sheet 16) of the diaper 10B along the longitudinal direction D1, as shown in FIG. 8A.

[0046] 8B, the waist portion 5 may have compressed portions 15c, 16c extending in the width direction D2. In this case, the waist portion 5 is thinner and more rigid than the general portion of the waist portion 5 at the position where the compressed portion 16c is formed so as to overlap the back leakage prevention sheet 16. Therefore, the first folded portion 21 is formed by the compressed portion 16c. Also, the waist portion is thinner and more rigid than the general portion of the waist portion 5 at the position where the compressed portion 15c is formed so as to overlap the gather pressing sheet 15. Therefore, the second folded portion 22 is formed by the compressed portion 15c.

[0047] That is, the bent portion 20 may be formed by compressed portions 15c, 16c provided in the waist portion 5 and extending in the width direction D2, as shown in FIG. 8B.

[0048] Furthermore, as in a third modified diaper 10D shown in Fig. 8C, the back leakage prevention sheet 16 and the gather pressing sheet 15 may be provided with laminated members 16d, 15d extending in the width direction D2. In this case, the thickness of the waist portion 5 is increased at the position where the laminated member 16d is provided on the back leakage prevention sheet 16, and the rigidity is higher than that of the general portion of the waist portion 5. Therefore, the laminated member 16d forms a first folded portion 21. Moreover, the thickness of the waist portion 5 is increased at the position where the laminated member 15d is provided on the gather pressing sheet 15, and the rigidity is higher than that of the general portion of the waist portion 5. Therefore, the laminated member 15d forms a second folded portion 22.

[0049] In other words, the folding portion 20 may be formed by laminating separate laminated members 15d, 16d to the sheet material (gather presser sheet 15 and back leakage prevention sheet 16) of the diaper 10D, as shown in FIG. 8C, to increase the thickness of the waist portion 5.

[0050] Moreover, in Examples 1 and 2, examples have been shown in which two folding portions 20 (first folding portion 21, second folding portion 22) are formed at a predetermined interval along the longitudinal direction D1. However, the number of folding portions 20 and the positions at which the folding portions 20 are formed are not limited to the examples shown in Examples 1 and 2. In other words, it is sufficient that at least one folding portion 20 is formed in the waist portion 5, and the number of folding portions 20 and the positions at which the folding portions 20 are formed can be set arbitrarily.

[0051] In addition, in the first embodiment, the first folded portion 21 is formed at a position 50 mm to 180 mm below the upper end portion 5a of the waist portion 5, and the second folded portion 22 is formed at a position 50 mm to 100 mm below the first folded portion 21. However, the position at which the folded portion 20 is formed is not limited to this. The first folded portion 21 may be formed at a position from the center position S between the upper end portion 5a of the waist portion 5 and the end portion 17d of the absorbent pad 17 in the longitudinal direction D1 to the end portion 17d of the absorbent pad 17. The second folded portion 22 may be formed at a position away from the first folded portion 21 by a distance equal to the distance from the first folded portion 21 to the center position S. Therefore, the positions at which the first folded portion 21 and the second folded portion 22 are formed can be changed depending on the length of the waist portion 5 in the longitudinal direction D1, the size of the absorbent pad 17 to be attached to the diaper 10, and the like.

[0052] In addition, in the first embodiment, the absorbent pad 17 is attached to the inside of the diaper 10. However, the absorbent pad 17 does not necessarily have to be used. When the absorbent pad 17 is not used, the waist portion 5 does not necessarily have to be folded to the inside of the diaper 10. Therefore, when the wearer M wears the diaper 10 without the absorbent pad 17, the wearer M may fold the waist portion 5 toward the outside of the diaper 10 at both the first fold portion 21 and the second fold portion 22. In other words, the wearer M may fold the waist portion 5 twice to the outside of the diaper 10.

[0053] Also, in Example 2, an example was shown in which, in the first region 7 of the waistband portion 5, the elastic members 14 are arranged along the folds 20 in the central region α, and in the side regions β, the elastic members 14 are arranged so as to gradually incline diagonally upward as they approach the joining position γ. However, this is not limited to this. In the central region α, the elastic members 14 do not necessarily have to be arranged along the folds 20, and for example, even in the central region α, the elastic members 14 may be arranged so as to gradually incline diagonally upward as they approach the joining position γ. [Explanation of symbols]

[0054] 10. Pants-type disposable diapers 1 ventral part 2 Dorsal part 3 Inseam 5. Waist 5a Upper end 7 First area 8 Second area 14 Elastic members 15 Gathering presser sheet 15a Lower edge 16 Back leakage prevention sheet 16a Lower edge 17 Absorbent Pads 20 Bend section 21 First bend 22 Second bend D1 Longitudinal direction D2 Width direction M wearer α central region β lateral region γ Junction position

Claims

1. A pants-type disposable diaper having a ventral portion, a dorsal portion, and a crotch portion located between the ventral portion and the dorsal portion, the longitudinal direction being a direction from the ventral portion through the crotch portion toward the dorsal portion, and the width direction being a direction perpendicular to the longitudinal direction, The waistband portion is formed by joining both widthwise sides of the abdominal portion and both widthwise sides of the dorsal portion, The waist portion has a folding portion formed at a middle position in the longitudinal direction, the folding portion extending along the width direction and serving as a starting point for folding the waist portion, The bent portion includes a first bent portion formed between a central position between an upper end of the waist portion and an end in a longitudinal direction of an absorbent pad disposed inside the crotch portion, and the end of the absorbent pad. A pants-type disposable diaper characterized by the above.

2. In the pants-type disposable diaper according to claim 1, The waist portion is provided with an elastic member that is elastic in the width direction, The elastic members are arranged in the side regions facing the sides of the wearer from the joining position between the abdominal side portion and the back side portion toward the upper end of the waist portion. A pants-type disposable diaper characterized by the above.

3. In the pants-type disposable diaper according to claim 1 or 2, The waist portion is provided with a plurality of elastic members that are elastic in the width direction at predetermined intervals along the longitudinal direction, The stretching stress of the stretchable member arranged in a first region closer to the upper end of the waistband than the first bend is higher than the stretching stress of the stretchable member arranged in a second region closer to the crotch portion than the first bend. A pants-type disposable diaper characterized by the above.

4. In the pants-type disposable diaper according to any one of claims 1 to 3, the folding portion has a second folding portion formed at a position away from the first folding portion by a distance equal to the distance from the first folding portion to the central position. A pants-type disposable diaper characterized by the above.

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