WO2024038638A1

WO2024038638A1 - Underpants-type disposable diaper

Info

Publication number: WO2024038638A1
Application number: PCT/JP2023/013975
Authority: WO
Inventors: 裕喜新井
Original assignee: 大王製紙株式会社
Priority date: 2022-08-19
Filing date: 2023-04-04
Publication date: 2024-02-22
Also published as: JP2024028031A

Abstract

In order to provide an underpants-type disposable diaper that can suppress leakage of bodily fluids through leg-encircling opening sections, this underpants-type disposable diaper (1) comprises: an interior body (10) that has an absorbent body (13) that is longer in a longitudinal direction (L), and solid gathers (15) that are disposed in both side sections of the absorbent body (13) in a width direction (W); and an exterior body (20) that covers non-skin sides of both end sections of the interior body (10) in the longitudinal direction (L). The underpants-type disposable diaper has formed therein a waist opening section (2) and a pair of leg-encircling opening sections (3), and is provided with a leakage prevention section (30) that: extends in the longitudinal direction (L) on the outer side of the solid gathers (15) in the width direction (W) so that one end section (31a) in the longitudinal direction (L) is continuous with the external body (20) on an abdominal side and another end section (31b) in the longitudinal direction (L) is continuous with the external body (20) on a dorsal side; and includes a non-stretch region (33) that is along the solid gathers (15) and a stretch region (34) that is provided on the outer side of the non-stretch region (33) in the width direction.

Description

Pants-type disposable diaper

The present invention relates to a pants-type disposable diaper.

Conventionally, an inner body having an absorbent body and an outer body attached to the non-skin side of the inner body are provided, and both sides of the outer body in the width direction are joined to form a waist opening and a pair of leg openings. Pants-type disposable diapers are known (see, for example, Patent Document 1 and Patent Document 2).

Here, in the pants-type disposable diaper described in Patent Document 1, a first leak-proof wall is formed along both widthwise edges of the absorbent body, and a second leak-proof wall is formed on the outside of the first leak-proof wall in the width direction. A wall is formed. A low-rigidity region having lower rigidity than other parts is formed between the first leakage-prevention wall and the second leakage-prevention wall, and a shirring elastic material is provided. As a result, in the pants-type disposable diaper described in Patent Document 1, both sides of the absorbent body in the width direction are easily bent downward (outside) along the wearer's legs.

Furthermore, in the pants-type disposable diaper described in Patent Document 2, a leak-proof sheet that can be expanded and contracted in the width direction is arranged on the skin side of the ventral end and the dorsal end of the absorbent body. Then, the leak-proof sheet contracts toward the inner side in the width direction (center side in the width direction) and separates from the absorber, thereby forming a pocket that opens toward the inner side in the longitudinal direction.

Patent No. 4014471 Patent No. 3771466

However, in conventional pants-type disposable diapers, when the wearer assumes a supine position, body fluids such as urine may exceed the dorsal end of the absorbent body and reach the outer body. Body fluids that reach the outer body beyond the back end of the absorbent body do not leak from the waist opening because the waist opening is compressed by the wearer's back, and instead flow through the outer body and prevent wear. It flows along the person's groin area. The body fluid that has flowed along the groin region may leak to the outside from the opening around the leg.

The present invention was made in view of the above problem, and an object of the present invention is to provide a pants-type disposable diaper that can suppress leakage of body fluids from openings around the legs.

In order to achieve the above object, the present invention provides an absorbent body that is long in the longitudinal direction, where the longitudinal direction is the direction extending from the ventral side to the dorsal side of the wearer, and the width direction is the direction perpendicular to the longitudinal direction; an interior body including three-dimensional gathers extending in the longitudinal direction on both sides of the absorbent body in the width direction and standing up on the skin side of the wearer; and at least non-skin at both ends of the interior body in the longitudinal direction. an exterior body that covers a side, wherein both sides of the exterior body on the ventral side in the width direction and both sides of the exterior body on the dorsal side in the width direction are respectively joined, and a waist opening and This is a pants-type disposable diaper with a pair of openings around the legs. Here, an outer side of the three-dimensional gathers in the width direction extends in the longitudinal direction, one end in the longitudinal direction is continuous with the exterior body on the ventral side, and the other end in the longitudinal direction A leak-proof part is provided, the part of which is continuous with the exterior body on the back side. The leakage prevention part has a non-stretchable region along the three-dimensional gathers, and a stretchable region provided outside the non-stretchable region in the width direction.

Thereby, the pants-type disposable diaper of the present invention can suppress leakage of body fluids from the openings around the legs.

1 is a developed view showing the pants-type disposable diaper of Example 1. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is a sectional view taken along line BB in FIG. 1. FIG. 1 is an external view showing the pants-type disposable diaper of Example 1. FIG. FIG. 2 is an explanatory diagram showing the flow of body fluid in the pants-type disposable diaper of Example 1. FIG. 2 is an explanatory diagram showing the flow of body fluid in the pants-type disposable diaper of Example 1. FIG. 2 is an explanatory diagram showing an overlapping state of leak-proof sheet materials in the pants-type disposable diaper of Example 1. FIG. 2 is a developed view showing a pants-type disposable diaper of Example 2. 9 is a sectional view taken along line CC in FIG. 8. FIG. It is a development view showing a pants-type disposable diaper of a first modification. It is a development view showing a pants-type disposable diaper of a second modification. It is a development view showing a pants-type disposable diaper of a third modification. 13 is a sectional view taken along line DD in FIG. 12. FIG. It is a development view showing a pants-type disposable diaper of a fourth modification.

A form for implementing the pants-type disposable diaper according to the present invention will be explained as follows based on Example 1 and Example 2 shown in the drawings. In the following description, the direction extending from the ventral side to the dorsal side of the wearer is referred to as the "longitudinal direction L", and the direction orthogonal to the longitudinal direction L is referred to as the "width direction W". Further, a direction perpendicular to both the longitudinal direction L and the width direction W is defined as a "thickness direction H." In the thickness direction H, the side closer to the wearer's body when worn is defined as the "skin side", and the side closer to the underwear when worn is defined as the "non-skin side".

(Example 1)
The pants-type disposable diaper of Example 1 (hereinafter referred to as "paper pants 1") includes an inner body 10, an outer body 20, and a leakage prevention part 30, as shown in FIG.

As shown in FIG. 1, the interior body 10 has a rectangular shape in which the longitudinal direction L is longer than the width direction W when viewed in plan from the thickness direction H. As shown in FIGS. 2 and 3, the interior body 10 includes a top sheet 11, a back sheet 12, an absorbent core 13, and a pair of gathered sheets 14. In the interior body 10, an absorbent body 13 is sandwiched between a top sheet 11 and a back sheet 12, a pair of gathered sheets 14 are arranged on both sides in the width direction W, and appropriate areas such as the periphery are covered with hot melt material. It is fixed and formed by adhesive or welding, etc.

The top sheet 11 is a sheet material placed on the skin side. The top sheet 11 has liquid permeability, which is a property of permeating body fluids, and allows the body fluids to quickly pass through toward the absorbent body 13. The top sheet 11 is made of, for example, a liquid-permeable nonwoven fabric.

The back sheet 12 is a sheet material placed on the non-skin side. The backsheet 12 has liquid impermeability, which is a property that does not allow liquid to pass through, and prevents body fluids held by the absorbent body 13 from permeating, thereby preventing clothing and the like from getting wet. The back sheet 12 is made of, for example, a resin film.

The absorbent body 13 is a liquid absorbent material sandwiched between the top sheet 11 and the back sheet 12. The absorbent body 13 includes, for example, absorbent polymer particles and pulp fibers, and may be wrapped with a core wrap sheet (not shown) made of crepe paper, nonwoven fabric, or the like. The absorbent body 13 has a smaller outer shape than the top sheet 11 and the back sheet 12. The absorbent body 13 may be a single layer or a multilayer.

The pair of gather sheets 14 are elongated sheet materials extending in the longitudinal direction L. The gather sheet 14 is formed of, for example, a water-repellent or liquid-impermeable nonwoven fabric. Here, the gather sheet 14 has one end 14a in the width direction W fixed to the non-skin side of the back sheet 12 using an adhesive such as hot melt or welding (see FIG. 2), and the other end 14a in the width direction W The portion 14b is a free end. At the other end 14b of the gather sheet 14 in the width direction W, which is a free end, a three-dimensional gather stretchable material 14c that can be stretched in the longitudinal direction L is provided in a predetermined stretched state.

The three-dimensional gather stretchable material 14c is composed of, for example, a plurality of thread-like or band-like synthetic rubbers arranged in parallel in the width direction W and stretchable in the longitudinal direction L. The gather sheet 14 is contracted by the elastic force of the three-dimensional gather elastic material 14c, stands up toward the wearer, and forms a wall-like three-dimensional gather 15. That is, the interior body 10 has three-dimensional gathers 15 that are arranged on both sides of the absorbent body 13 in the width direction W, extend in the longitudinal direction L, and stand up from the top sheet 11 toward the skin of the wearer. In the paper pants 1, the three-dimensional gathers 15 prevent body fluid from leaking from both sides of the absorbent body 13 in the width direction W.

The exterior body 20 covers at least both ends of the interior body 10 in the longitudinal direction L from the non-skin side, and is joined to the interior body 10. Here, the exterior body 20 has a rectangular shape that is long in the width direction W when viewed from the thickness direction H, and extends outward in the longitudinal direction L from the interior body 10 (see FIG. 1). ). Furthermore, the exterior body 20 extends outward in the width direction W from the interior body 10, and the exterior body 20 (hereinafter referred to as “first exterior body 21 '') in the width direction W, and the width direction W of the exterior body 20 (hereinafter referred to as the "second exterior body 22") at the other end (back side) in the longitudinal direction L of the interior body 10. Both

side portions

22a and 22b are joined by welding or the like. Accordingly, as shown in FIG. 4, the paper pants 1 have a waist opening 2 through which the wearer's torso passes, and a pair of leg openings 3 through which the wearer's legs pass. Formed in the shape of pants.

The exterior body 20 of Example 1 is provided separately at both ends of the interior body 10 in the longitudinal direction L, that is, on the ventral side and the dorsal side, and includes a first exterior body 21 on the ventral side and a second exterior body 21 on the dorsal side. It is a two-part type consisting of a body 22. Therefore, when the paper pants 1 are formed into a pants shape, the back sheet 12 of the interior body 10 is exposed in the portion that covers the wearer's crotch.

The exterior body 20 (the first exterior body 21 and the second exterior body 22) includes an inner sheet material 23a, an outer sheet material 23b (see FIG. 2), and a shirring elastic material 24 provided between these. have.

The inner sheet material 23a and the outer sheet material 23b each have liquid impermeability, which is a property of not allowing liquid to pass through. Note that the inner sheet material 23a and the outer sheet material 23b may be composed of separate sheet materials, or may be composed of a common sheet material. When the inner sheet material 23a and the outer sheet material 23b are composed of one sheet material, for example, one sheet material is folded back to form the inner sheet material 23a and the outer sheet material 23b.

The shirred elastic material 24 is an elastic member that can be expanded and contracted in the width direction W. The shirred elastic material 24 is fixed to the inner sheet material 23a and the outer sheet material 23b in a predetermined stretched state, and shrinks and returns to its natural length, thereby shrinking the inner sheet material 23a and the outer sheet material 23b. The shirred elastic material 24 is made of elongated elastic material such as a plurality of rubber threads that are arranged in parallel in the longitudinal direction L and expand and contract in the width direction W, for example. The exterior body 20 expands and contracts in the width direction W as the shirring elastic material 24 expands and contracts, and fits around the wearer's torso. As the shirring elastic material 24, in addition to an elongated elastic material such as a rubber thread, elastic materials in the form of a band, a net, a film, etc. can be used.

Furthermore, in the paper pants 1, in order to suppress the deformation of the interior body 10, the shirred elastic material 24 is not arranged in the region of the exterior body 20 where the interior body 10 overlaps and the surrounding area. Therefore, in the exterior body 20, the area where the shirred elastic material 24 is arranged, that is, the area other than the area where the interior body 10 overlaps and the surrounding area becomes a widthwise elastic area S that can be expanded and contracted in the width direction W.

Note that the shirring elastic material 24 may be arranged on the entire surface of the inner sheet material 23a and the outer sheet material 23b. In this case, it is preferable that the shirred elastic material 24 be subjected to a breaking treatment in the area where the interior body 10 overlaps and the surrounding area thereof, so that the elastic force of the shirred elastic material 24 is inhibited. The area in which the shirred elastic material 24 is not subjected to the breaking process becomes a widthwise elastic area S that can be expanded and contracted in the width direction W. Moreover, the breaking process for the shirred elastic material 24 is performed by, for example, forming a large number of fine through holes in the inner sheet material 23a and the outer sheet material 23b to which the shirred elastic material 24 is fixed, and breaks the shirred elastic material 24 by the through holes. It is done by

As shown in FIG. 1, the leak prevention part 30 is disposed at a position outside the three-dimensional gathers 15 in the width direction W, and extends in the longitudinal direction L. The leak prevention part 30 of Example 1 is constituted by leak prevention sheet materials 31 arranged on both sides of the interior body 10 in the width direction W, and leak prevention elastic materials 32 provided on the leak prevention sheet materials 31. ing.

The leak-proof sheet material 31 is a sheet material that is a separate member from the interior body 10 and the exterior body 20, and has an elongated band shape extending in the longitudinal direction L. The leak-proof sheet material 31 is made of water-repellent or liquid-impermeable nonwoven fabric.

Further, one end 31a of the leak-proof sheet material 31 in the longitudinal direction L is joined to the first exterior body 21, which is the exterior body 20 on the ventral side, by, for example, an adhesive such as hot melt, welding, or the like. In Example 1, one end 31a of the leak-proof sheet material 31 in the longitudinal direction L is joined to the non-skin side of the widthwise elastic region S of the first exterior body 21. As a result, one end portion of the leakage prevention portion 30 in the longitudinal direction L is continuous with the widthwise elastic region S of the first exterior body 21.

The other end 31b of the leak-proof sheet material 31 in the longitudinal direction L is joined to the second exterior body 22, which is the exterior body 20 on the back side, by, for example, an adhesive such as hot melt, welding, or the like. In Example 1, the other end 31b of the leak-proof sheet material 31 in the longitudinal direction L is joined to the non-skin side of the widthwise elastic region S of the second exterior body 22. Thereby, the other end portion of the leakage prevention portion 30 in the longitudinal direction L is continuous with the widthwise elastic region S of the second exterior body 22.

One end 31c of the middle part in the longitudinal direction L of the leak-proof sheet material 31 on the inner side in the width direction W is fixed to the non-skin side of the interior body 10 by, for example, an adhesive such as hot melt or welding. (See Figure 3).

The leakage prevention elastic material 32 is composed of, for example, a plurality of rubber threads arranged in parallel in the width direction W and elastic in the longitudinal direction L. The leak-proof elastic material 32 is fixed to the other end 31d on the outside in the width direction W of the leak-proof sheet material 31 in a predetermined stretched state. In addition, in Example 1, the leak-proof elastic material 32 is fixed over the entire length of the leak-proof sheet material 31. As the leak-proof elastic material 32 expands and contracts, the other end 31d of the leak-proof sheet material 31 in the width direction W stands up on the wearer's skin side (see FIG. 3).

Then, a region of the leak-proof sheet material 31 where the leak-proof elastic material 32 is not provided and where the leak-proof sheet material 31 does not expand or contract becomes a non-stretchable region 33 of the leak-proof part 30. Furthermore, the area of the leak-proof sheet material 31 where the leak-proof sheet material 31 expands and contracts due to the expansion and contraction force of the leak-proof elastic material 32 becomes the expandable area 34 of the leak-proof part 30 . Note that the non-stretchable region 33 is a region in which the leakage preventive portion 30 hardly stretches or contracts in both the longitudinal direction L and the width direction W. Further, the elastic region 34 is a region where the leakage prevention part 30 expands and contracts in the longitudinal direction L or the width direction W and stands up on the wearer's skin side.

Furthermore, since the leak-proof elastic material 32 is fixed to the other end 31d of the leak-proof sheet material 31 in the width direction W, the non-stretchable region 33 is set along the three-dimensional gathers 15 and has a predetermined width in the width direction W. It will have a width. Further, the stretchable region 34 is located outside the non-stretchable region 33 in the width direction W. That is, the leak prevention part 30 has a non-stretchable region 33 along the three-dimensional gathers 15 and a stretchable region 34 provided outside the non-stretchable region 33 in the width direction W.

The function of the paper pants 1 of Example 1 will be explained as follows.

When the wearer wearing the paper pants 1 of Example 1 assumes a supine position, some of the body fluids such as urine flow between the wearer and the inner body 10, as shown by the arrows in FIG. It may reach the exterior body 20 (second exterior body 22) beyond one end (back side end) of the interior body 10 in the longitudinal direction L. The body fluid that has flowed to the exterior body 20 (second exterior body 22) does not leak from the waist opening 2 due to reasons such as the waist opening 2 being compressed by the wearer's back, and the body fluid flows to the exterior body 20 (second exterior body 22). 2) and the wearer, and flows along the wearer's groin area.

Here, in the paper pants 1 of Example 1, the leakage prevention part 30 is provided outside the three-dimensional gathers 15 of the interior body 10 in the width direction W. The leak prevention part 30 extends in the longitudinal direction L, and one end 31a in the longitudinal direction L of the leak prevention sheet material 31 constituting the leak prevention part 30 is continuous with the first exterior body 21 on the ventral side. The other end 31b of 31 in the longitudinal direction L is continuous with the second exterior body 22 on the back side. Further, the leak prevention part 30 has a non-stretchable region 33 along the three-dimensional gathers 15 and a stretchable region 34 provided outside the non-stretchable region 33 in the width direction W.

For this reason, when the paper pants 1 are worn, the leak-proof part 30 extends along the wearer's groin region. Further, as shown in FIG. 6, the three-dimensional gathers 15 rises like a wall toward the wearer's skin as the three-dimensional gathers elastic material 14c contracts. Furthermore, as shown in FIG. 6, the elastic area 34 stands up like a wall toward the wearer's skin as the leak-proof elastic material 32 contracts. As a result, in the paper pants 1 of Example 1, a space (pocket) K that is open to the skin side and extends along the groin region is defined by the three-dimensional gathers 15, the stretchable region 34, and the non-stretchable region 33 between them. .

Thereby, the body fluid that has flowed along the wearer's groin region flows into the space K between the three-dimensional gathers 15 and the elastic region 34, as indicated by the arrows in FIGS. 5 and 6. As a result, the body fluid flowing along the inguinal region can be stored in the space K, and the paper pants 1 of Example 1 can suppress the leakage of body fluid from the leg openings 3.

Furthermore, in the paper pants 1 of Example 1, the exterior body 20 (the first exterior body 21 and the second exterior body 22) has a widthwise elastic region S that expands and contracts in the width direction W. The leak-proof sheet material 31 constituting the leak-proof part 30 has one end 31a and the other end 31b in the longitudinal direction L both joined to the widthwise stretchable region S of the exterior body 20, and leak-proof. The portion 30 is continuous with the widthwise elastic region S of the exterior body 20.

Therefore, the

ends

31a and 31b of the leak-proof sheet material 31 in the longitudinal direction L can be contracted in the width direction W integrally with the exterior body 20. As a result, the non-stretchable region 33 of the leakage prevention part 30 tends to bend in the direction away from the wearer's skin, and body fluids tend to accumulate in the space K between the three-dimensional gathers 15 and the stretchable region 34. As a result, the paper pants 1 of Example 1 can further suppress leakage of body fluids from the leg openings 3.

In addition, in the paper pants 1 of Example 1, the leak prevention part 30 includes a leak prevention sheet material 31 which is a sheet material extending in the longitudinal direction L of a member separate from the interior body 10 and the exterior body 20, and the leak prevention sheet material 31. and a leak-preventing elastic material 32 provided in the.

Thereby, the paper pants 1 of Example 1 can share the shape and specifications of the inner body 10 and the outer body 20 with those of a general pants-type disposable diaper that does not have the leakage prevention part 30. Therefore, diversification of materials can be suppressed and manufacturing costs can be reduced. Further, the paper pants 1 of Example 1 can be manufactured by adding the leak-proof sheet material 31 to a general pants-shaped disposable diaper that does not have the leak-proof part 30, and is easily manufactured. be able to.

Furthermore, in the paper pants 1 of Example 1, both ends 31a and 31b in the longitudinal direction L of the leak-proof sheet material 31 constituting the leak-proof part 30 are both joined to the non-skin side of the exterior body 20.

As a result, in the paper pants 1 of Example 1, as shown in FIG. The step D caused by the overlap can be lowered toward the downstream in the flow direction of body fluid. Therefore, the level difference D does not obstruct the flow of body fluid, and the body fluid can smoothly flow toward the space K. That is, the paper pants 1 of Example 1 can guide body fluid flowing along the exterior body 20 toward the space K, and can further suppress leakage of body fluid.

(Example 2)
The pants-type disposable diaper in Example 2 (hereinafter referred to as "paper pants 1A") includes an inner body 10, an outer body 20, and a leakage prevention part 40, as shown in FIGS. 8 and 9. ing.

In the paper pants 1A of Example 2, each structure of the inner body 10 and the outer body 20 is the same as the inner body 10 and the outer body 20 in the paper pants 1 of Example 1, so the same reference numerals are given. , the explanation is omitted.

On the other hand, the leak-proof part 40 of Example 2 is arranged at a position outside the three-dimensional gathers 15 in the width direction W, and includes a leak-proof sheet material 41 extending in the longitudinal direction L, a leak-proof elastic material 42, and a leak-proof sheet material 41 extending in the longitudinal direction L. The absorber 45 is composed of an absorber 45.

As in the first embodiment, the leak-proof sheet material 41 has one end 41a in the longitudinal direction L joined to the first exterior body 21 on the ventral side, and the other end 41b in the longitudinal direction L joined to the first exterior body 21 on the dorsal side. 2 is joined to the exterior body 22. In the second embodiment as well, one end 41a of the leak-proof sheet material 41 in the longitudinal direction L is joined to the non-skin side of the widthwise elastic region S of the first exterior body 21. Further, the other end 41b of the leak-proof sheet material 41 in the longitudinal direction L is joined to the non-skin side of the widthwise elastic region S of the second exterior body 22. Furthermore, in the intermediate portion of the leak-proof sheet material 41 in the longitudinal direction L, one end portion 41c in the width direction W is joined to the non-skin side of the interior body 10.

Similarly to the first embodiment, the leak-proof elastic material 42 is expandable and contractible in the longitudinal direction L, and is fixed to the other end 41d of the leak-proof sheet material 41 in the width direction W.

The leak-proof part 40 of Example 2 has a non-stretchable region 43 in which the leak-proof elastic material 42 is not provided, and a stretchable region 44 in which the leak-proof elastic material 42 is provided, and the leak-proof absorbent material 45 is provided on the skin side of the non-stretchable region 43.

Here, the leak-proof absorbent body 45 includes a top sheet 45a, a back sheet 45b, and an absorbent body 45c (see FIG. 9). The top sheet 45a is a sheet material formed from the same material as the top sheet 11 of the interior body 10 and placed on the skin side. Further, the back sheet 45b is a sheet material formed from the same material as the back sheet 12 of the interior body 10 and placed on the non-skin side. The absorbent body 45c is made of the same material as the absorbent body 13 of the interior body 10, and includes, for example, absorbent polymer particles and pulp fibers.

The leak-proof absorbent body 45 is constructed by sandwiching the absorbent body 45c between the top sheet 45a and the back sheet 45b, and fixing appropriate areas such as the peripheral edges of the top sheet 45a and the back sheet 45b by welding or the like. It is formed.

Furthermore, the leak-proof absorber 45 extends along the longitudinal direction L from the first exterior body 21 to the second exterior body 22. In the leak-proof absorbent body 45, the non-skin side of the back sheet 45b is fixed to the skin side of the leak-proof sheet material 41, and the top sheet 45a faces the wearer.

Thereby, the paper pants 1A of Example 2 can absorb body fluid accumulated in the space K formed between the three-dimensional gathers 15 and the elastic region 44 by the leak-proof absorbent body 45. Therefore, the paper pants 1A of the second embodiment can suppress leakage of bodily fluids from the leg openings 3 better than the paper pants 1 of the first embodiment.

Although the pants-type disposable diaper of the present invention has been described above based on Examples 1 and 2, the specific structure is not limited to these Examples, and the invention according to each claim Changes and additions to the design are permitted as long as they do not deviate from the gist.

In the paper pants 1 of Example 1, the exterior body 20 is provided separately at both ends of the inner body 10 in the longitudinal direction L, and is composed of a first exterior body 21 on the ventral side and a second exterior body 22 on the dorsal side. An example of a two-part type was shown. However, like the pants-type disposable diaper 1B of the first modification shown in FIG. It may be of a type that integrally covers the entire area (dorsal side). In this case, a pair of curved edges 51 are formed on both sides of the exterior body 50 in the width direction W. Each curved edge 51 is located at an intermediate portion of the exterior body 50 in the longitudinal direction L, and is formed by cutting the exterior body 50 so as to curve inward in the width direction W. The pair of curved edges 51 are formed when both

sides

50a and 50b in the width direction W of the exterior body 50 on the ventral side and both

sides

50c and 50d in the width direction W of the exterior body 50 on the dorsal side are respectively joined. A pair of leg openings 3 are formed.

Furthermore, in the paper pants 1 of Example 1, an example was shown in which the leak-proof part 30 was constituted by a leak-proof sheet material 31 that is a sheet material that is a separate member from the interior body 10 and the exterior body 20. However, as in the pants-type disposable diaper 1B of the first modification shown in FIG. It may be configured by

That is, in the pants-type disposable diaper 1B of the first modification, a region in which the shirring elastic material 24 is not arranged is set in the middle part of the exterior body 50 in the longitudinal direction L. Further, the leg elastic material 52 is arranged along the curved edge 51 with a predetermined distance from the interior body 10 (absorbent body 13). As a result, in the pants-type disposable diaper 1B of the first modification, both the shirring elastic material 24 and the leg elastic material 52 are disposed on both sides of the inner body 10 (absorbent body 13) in the width direction W of the outer body 50. The area where is not arranged becomes the non-stretchable area 53a of the leakage prevention part 53. In addition, in the outer body 50, the area where the leg elastic material 52 is arranged on both sides of the inner body 10 (absorbent body 13) in the width direction W becomes the elastic area 53b of the leakage prevention part 53.

In the pants-type disposable diaper 1B of the first modification, the outer case There is no boundary between the leakage prevention part 50 and the leakage prevention part 53. Therefore, the pants-type disposable diaper 1B of the first modification can smoothly flow the body fluid flowing along the exterior body 50 into the space K formed by the leakage prevention part 53, and from the leg opening 3. The leakage of body fluids can be suppressed.

In the pants-type disposable diaper 1B of the first modification, the leg elastic material 52 extends along the curved edge 51 and extends in the width direction W of the exterior body 50 at the center in the longitudinal direction L of the exterior body 50. curved towards the center. Furthermore, a leg elastic material 52 extending from the

sides

50a, 50b in the width direction W of the exterior body 50 on the ventral side, and a leg elastic material 52 extending from the

side parts

50c, 50d in the width direction W of the exterior body 50 on the dorsal side. and overlap each other at the center of the exterior body 50 in the longitudinal direction L.

However, the arrangement of the leg elastic material 52 is not limited to the pants-type disposable diaper 1B of the first modification. The leg elastic material 52 may be arranged, for example, as in the pants-type disposable diaper 1C of the second modification shown in FIG. 11. That is, the leg elastic material 52 has a curved edge 51 extending from the

sides

50a and 50b in the width direction W of the exterior body 50 on the ventral side to the

sides

50c and 50d in the width direction W of the exterior body 50 on the dorsal side. It may extend continuously in an arc shape along. Also in the pants-type disposable diaper 1C of the second modification, the area where both the shirring elastic material 24 and the leg elastic material 52 are not arranged on both sides of the outer body 50 in the width direction W is the non-elastic part of the leakage prevention part 53. This becomes the area 53a. Of both sides of the exterior body 50 in the width direction W, the area where the leg elastic material 52 is arranged becomes the elastic area 53b of the leakage prevention part 53.

Furthermore, in the paper pants 1 of Example 1, an example was shown in which the leak-proof sheet material 31 constituting the leak-proof part 30 was joined to the non-skin side of the exterior body 20. However, the leak-proof sheet material 61 may be joined to the skin side of the exterior body 50, as in the pants-type disposable diaper 1D of the third modification shown in FIGS. 12 and 13. That is, the leak-proof sheet material 61 may be sandwiched between the interior body 10 and the exterior body 50.

In the pants-type disposable diaper 1D of the third modification, the leak-proof sheet material 61 is joined to the skin side of the exterior body 50, so that body fluids can be absorbed into the space formed by the leak-proof part 60 inside the exterior body 20. Flows into K. Thereby, the pants-type disposable diaper 1D of the third modification can improve the effect of suppressing leakage of bodily fluids at the joint portion between the leak-proof sheet material 61 and the exterior body 50.

Furthermore, the leakage prevention part 70 is configured to have an integral type of exterior body 50 in the longitudinal direction L extending from the ventral side to the dorsal side, as in the pants-type disposable diaper 1E of the fourth modification shown in FIG. It may be constructed by arranging the shirring elastic material 24 that can be expanded and contracted in the width direction W over the entire surface and then breaking a part of the shirring elastic material 24.

That is, in the pants-type disposable diaper 1E of the fourth modification, the shirred elastic material 24 is subjected to a breaking treatment in a predetermined region along the longitudinal direction L on both sides of the inner body 10 (absorbent body 13) in the width direction W. Therefore, the elastic force of the shirring elastic material 24 is inhibited. In addition, the breaking process for the shirred elastic material 24 is performed by, for example, forming a large number of fine through holes in the inner sheet material 23a and the outer sheet material 23b to which the shirred elastic material 24 is fixed, and ruptures the shirred elastic material 24 by the through holes. It is done by

Furthermore, by not applying an adhesive for fixing the shirring elastic material 24 to the surrounding area of the interior body 10 and not fixing the shirring elastic material 24 to the surrounding area of the interior body 10, the elastic force of the shirring elastic material 24 is reduced. May be inhibited. In this case, it is not necessary to break the shirring elastic material 24 that forms the through hole in the exterior body 50. Therefore, fine through holes are not formed in the exterior body 50, and leakage of bodily fluids from the through holes formed in the exterior body 50 can be prevented.

In the pants-type disposable diaper 1E of the fourth modification, the area where the elastic force of the shirring elastic material 24 is inhibited is located on both sides of the inner body 10 (absorbent body 13) in the width direction W, and the leakage prevention part 70 is This becomes a non-stretchable region 71. Further, the area that is expanded and contracted by the shirred elastic material 24 arranged between the curved edge 51 formed on the exterior body 50 and the non-elastic area 71 becomes the elastic area 72 of the leakage prevention part 70.

In addition, in the pants-type disposable diaper 1E of the fourth modification, the elastic region 72 expands and contracts along the width direction W. Even in this case, the portion of the exterior body 50 along the curved edge 51 can rise toward the skin due to the elastic force of the shirring elastic material 24. A space K can be formed by the leakage prevention part 70, and leakage of body fluids from the leg opening 3 can be suppressed.

Cross-reference of related applications

This application claims priority based on Japanese Patent Application No. 2022-131335 filed with the Japan Patent Office on August 19, 2022, the entire disclosure of which is fully incorporated herein by reference.

Claims

When the longitudinal direction is defined as the direction extending from the ventral side to the dorsal side of the wearer, and the width direction is defined as the direction perpendicular to the longitudinal direction,
an inner body comprising: an absorbent body that is long in the longitudinal direction; and three-dimensional gathers that extend in the longitudinal direction on both sides of the absorbent body in the width direction and stand up on the skin side of the wearer;
an exterior body that covers at least both ends of the interior body in the longitudinal direction from the non-skin side;
Both sides in the width direction of the exterior body on the ventral side and both sides in the width direction of the exterior body on the dorsal side are respectively joined to form a waist opening and a pair of leg openings. It is a pants-type disposable diaper,
On the outside of the three-dimensional gathers in the width direction, the material extends in the longitudinal direction, one end in the longitudinal direction is continuous with the exterior body on the ventral side, and the other end in the longitudinal direction is continuous with the exterior body on the ventral side. A leakage prevention part continuous with the exterior body on the back side is provided,
The pants-type disposable diaper is characterized in that the leakage prevention part has a non-stretchable region along the three-dimensional gathers and a stretchable region provided outside the non-stretchable region in the width direction.
The pants-type disposable diaper according to claim 1,
The exterior body has a widthwise stretchable region that stretches in the widthwise direction,
The pants-type disposable diaper is characterized in that both ends of the leakage prevention part in the longitudinal direction are continuous with the widthwise stretchable region of the exterior body.
In the pants-type disposable diaper according to claim 1 or claim 2,
The leak prevention part is constituted by a leak prevention sheet material extending in the longitudinal direction, which is a separate member from the interior body and the exterior body, and a leak prevention elastic material provided on the leak prevention sheet material. Pants-type disposable diapers.
In the pants-type disposable diaper according to claim 3,
The pants-type disposable diaper, wherein both ends of the leak-proof sheet material in the longitudinal direction are joined to a non-skin side of the exterior body.
In the pants-type disposable diaper according to claim 1 or claim 2,
The pants-type disposable diaper is characterized in that the leakage prevention part is provided with an absorbent material capable of absorbing body fluids on the skin side of the non-stretchable region.