CN107106360B

CN107106360B - Underpants type disposable diaper

Info

Publication number: CN107106360B
Application number: CN201580055114.9A
Authority: CN
Inventors: 神山泉; 福田优子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2014-10-20
Filing date: 2015-09-03
Publication date: 2021-06-04
Anticipated expiration: 2035-09-03
Also published as: RU2017116524A3; JP2016077880A; CN107106360A; RU2017116524A; RU2678391C2; JP6674205B2

Abstract

An absorbent core (23) of a pants-type disposable diaper (10) comprises a central absorbent body (23c) and side absorbent bodies (23d), and a curved guide section formed by an opening extending in the longitudinal direction X is provided between these absorbent bodies. The absorbent core (23) is covered with the front sheet (21). An extended portion (21E) of the front sheet (21) extending toward the non-skin-facing surface is joined to a member (42) adjacent to the extended portion (21E) on the outer body (30) side of the extended portion (21E). The joint (43) between the extension part (21E) and the member (42) is located further outward in the width direction Y than the bend guide part. Elastic members (25') are arranged on both side edges of the absorbent core (23), and the side absorbent members (23d) are bent between the elastic members (25') and the joint sections (43).

Description

Underpants type disposable diaper

Technical Field

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

Background

There is known a technique of raising left and right side portions of an absorbent body of a disposable diaper toward a wearer's body to improve the fit of the diaper and to prevent liquid leakage from the sides. For example, patent document 1 describes that the proximal end portions of three-dimensional gathers are fixed to the non-skin-facing surfaces of both side portions of the absorbent body, and the side portions of the absorbent body are bent and raised by the contractive force of the elastic stretchable member of the yarn attached to the three-dimensional gathers. In this diaper, a portion of the top sheet extending outward from the side edge of the absorbent body is fixed while extending to the back side of the absorbent body, and the extended top sheet and the three-dimensional gathers are fixed to the back side of the absorbent body.

Unlike the technique described in patent document 1, a technique is also known in which a bending guide portion is provided in an absorbent body of a disposable diaper to deform the absorbent body. For example, patent document 2 describes that a curved guide portion is formed at a predetermined position from a center line bisecting the absorbent body in the longitudinal direction to a rear edge on the rear body side. The curved guide portions are provided on both sides of the absorbent body along the longitudinal center line at the position of the longitudinal center portion of the absorbent body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001-340380

Patent document 2: japanese laid-open patent publication No. 2008-012197

Disclosure of Invention

As described in patent documents 1 and 2, in a disposable diaper of a type in which an absorbent body is bent and raised, the raised absorbent body tends to fall inward in some cases due to the movement of a wearer who frequently opens and closes his or her legs, such as a low-age infant. As a result, the space for containing excrement becomes narrow, and therefore excrement cannot be contained or may leak over the laid absorbent body.

The invention provides a pants-type disposable diaper having an absorbent core and an outer covering disposed outside the absorbent core,

the absorbent core has a central absorbent body and a pair of side absorbent bodies arranged on both sides of the central absorbent body and extending in the longitudinal direction, and curved guide sections each having an opening extending in the longitudinal direction are provided between the central absorbent body and the pair of side absorbent bodies,

the skin-facing surface of the absorbent core is covered with a topsheet having extended portions extending outward in the width direction from both side edges of the absorbent core, the extended portions being folded back on the non-skin-facing surface side of the absorbent core to cover the non-skin-facing surface,

the extended portion of the front sheet is joined to a member which is closer to the outer body side than the extended portion and is adjacent to the extended portion,

the joint position between the extended portion and the member adjacent to the extended portion is located further outward in the width direction than the curved guide portion,

elastic members are disposed along both side edges of the absorbent core, and the side absorbers are bent between the elastic members and the joining positions.

Drawings

Fig. 1 is a perspective view showing one embodiment of a pants-type disposable diaper of the present invention.

Fig. 2 is a plan view of the diaper shown in fig. 1, as viewed from the front sheet side, in a state where the side seal portions thereof are opened and developed to be flat.

Fig. 3(a) is a plan view of the absorbent core of the diaper shown in fig. 1, fig. 3(b) is a sectional view taken along line b-b of fig. 3(a), and fig. 3(c) is a sectional view taken along line c-c of fig. 3 (a).

Fig. 4(a) is a sectional view taken along line IV-IV of fig. 2, and fig. 4(b) is an enlarged view of a main portion of fig. 4 (a).

Fig. 5 is a sectional view taken along line IV-IV of fig. 2 in a worn state of the diaper.

Fig. 6 is a plan view showing an arrangement state of the elastic member (corresponding to the diagram of fig. 2).

FIG. 7 is a sectional view showing another embodiment of the diaper of the present invention (corresponding to the view in FIG. 5).

FIG. 8 is a sectional view showing still another embodiment of the diaper of the present invention (corresponding to the view in FIG. 5).

FIG. 9 is a sectional view showing still another embodiment of the diaper of the present invention (corresponding to the view in FIG. 5).

Fig. 10 is a perspective view showing another embodiment of the diaper of the present invention.

Detailed Description

The present invention relates to an improvement of a disposable diaper, and more particularly, to a pants-type disposable diaper capable of stably maintaining a wide space for containing excrement.

The present invention will be described below based on preferred embodiments thereof with reference to the accompanying drawings. Fig. 1 is a perspective view showing an embodiment of a pants-type disposable diaper according to the present invention. Fig. 2 is a plan view of the diaper shown in fig. 1, as viewed from the front sheet side, in a state where the side seal S is opened and developed to be flat. The diaper 10 shown in fig. 1 and 2 is a so-called pant diaper. The diaper 10 includes an absorbent main body 20 and an exterior body 30 positioned on the non-skin contact surface side of the absorbent main body 20. In the diaper 10, a direction from the front side portion a to the back side portion B is referred to as a longitudinal direction X, and a direction perpendicular thereto is referred to as a width direction Y, in the diaper 10 which is divided into the front side portion a disposed on the front side of the wearer, the back side portion B disposed on the back side of the wearer, and the crotch portion C positioned therebetween. The crotch portion C is a region where the side edge of the outer package 30, which will be described later, is narrowed inward in the width direction Y, and is disposed in the crotch of the wearer in a state where the diaper 10 is worn. The abdomen portion a is a region closer to the abdomen of the wearer than the crotch portion C in the state where the diaper 10 is worn. The back portion B is a region closer to the back side of the wearer than the crotch portion C in the state where the diaper 10 is worn.

In the present invention, the "skin-facing surface side" refers to one (surface) of the front and back sides (surfaces) of each member of the diaper 10 that is disposed on the skin side of the wearer when the diaper 10 is worn. The "non-skin contact surface side" refers to one (surface) of the front and back sides (surfaces) of each member of the diaper 10 that is disposed on the opposite side of the skin side of the wearer when the diaper 10 is worn. In the following description, the "longitudinal direction" refers to a direction parallel to the long sides of the members. In the following description, a term "width direction" may be used, which is a direction perpendicular to the longitudinal direction.

The absorbent main body 20 is formed in a vertically long rectangular shape, and is joined to the widthwise central portion of the outer package 30 by a known joining means such as a hot melt adhesive so that the longitudinal direction thereof coincides with the longitudinal direction of the diaper 10 and extends from the front side portion a to the back side portion B. The exterior body 30 is joined to both side edges of the portion located on the front side a and both side edges of the portion located on the back side B by a known joining method such as heat sealing or ultrasonic sealing. Thereby, a pair of side seal portions S is formed in the diaper 10. By this joining, the waist opening 11 and the pair of

leg openings

12 and 12 are formed in the diaper 10, and the outer package 30 has an underpants-type three-dimensional shape.

As shown in fig. 2, the outer package 30 includes an inner layer sheet 31, an outer layer sheet 32, and thread-like elastic members fixed to respective portions between the 2 sheets. The elastic members of the respective portions will be described later. The inner layer sheet 31 and the outer layer sheet 32 have the same shape in the width direction Y. The outer layer sheet 32 extends from the front and rear end portions of the inner layer sheet 31 in the longitudinal direction X, and the extended portions 32E cover the front and rear end regions in the longitudinal direction of the absorbent main body 20. The outer edge of the outer package 30 forms the outline of the diaper 10 in the unfolded state. The inner layer sheet 31 and the outer layer sheet 32 are preferably made of the same or different air-permeable sheets, for example, nonwoven fabrics manufactured by various methods.

A plurality of waist elastic members 33 extending in the width direction of the diaper 10 are disposed along the waist opening edge of the outer package 30 in an extended state. Further, a plurality of leg elastic members 34 are disposed in an extended state along the opening edges of the leg portions of the exterior body 30. As shown in fig. 1, the leg elastic members 34 are not disposed across the outer package 30 in the width direction of the outer package 30 in the crotch portion C of the diaper 10. Therefore, the outer package 30 has a non-stretchable region in the crotch portion C of the diaper 10 and in the widthwise central region of the outer package 30.

As shown in fig. 2, the leg elastic members 34 are disposed separately in the front side portion a and the back side portion B of the outer package 30. That is, the leg elastic members 34 include a stomach-side leg elastic member 34A disposed in the stomach-side portion a and a back-side leg elastic member 34B disposed in the back-side portion B, and the stomach-side leg elastic member 34A and the leg elastic member 34B are formed of independent continuous bodies. In other words, the continuous body of the elastic member extending from the front side portion a to the back side portion B does not exist in the exterior body 30.

As shown in fig. 2, the crotch portion C of the diaper 10 is narrowed inward in the width direction Y, and the narrowest position (the position indicated by the one-dot chain line L in fig. 2) is located closer to the stomach side portion a than the position where the diaper 10 is divided into two halves in the longitudinal direction X. Further, a position T1 at which the stomach-side leg elastic member 34A intersects with the side edge of the absorbent core 23 and a position T2 at which the back-side leg elastic member 34B intersects with the side edge of the absorbent core 23 do not coincide, and the intersecting positions T1 and T2 are independent in the longitudinal direction X. Further, the abdomen-side leg elastic member 34A and the back-side leg elastic member 34B intersect each other at a position inward in the width direction Y with respect to the side edge of the absorbent main body 20, and the intersection position T3 of both the

elastic members

34A and 34B is offset toward the abdomen-side portion a side from a position at which the diaper 10 is divided into front and rear halves in the longitudinal direction X. The position T3 substantially coincides with the narrowest position in the crotch portion C (the position indicated by the one-dot chain line L in fig. 2).

Between the waist elastic member 33 and the leg elastic members 34, a plurality of waistline elastic members 35 extending in the width direction Y of the diaper 10 are disposed in an extended state. In the front side portion a and the back side portion B of the outer package 30, the waist elastic member 35 is disposed in an extended state at a position further outward in the width direction Y than both side edges of the absorbent main body 20. The waistline elastic member 35 is disposed so as not to straddle the absorbent main body 20.

As shown in fig. 2, the absorbent main body 20 has an absorbent core 23. As shown in fig. 3, the absorbent core 23 has a two-layer structure of a lower absorbent body 23a and an upper absorbent body 23b disposed thereon. The upper absorbent body 23b is formed in a substantially T-shape in plan view. The lower absorbent body 23a has a size larger than that of the upper absorbent body 23b, and is rectangular in longitudinal direction as a whole. The lower absorbent body 23a has a pair of longitudinal openings 231a along the longitudinal direction X. The opening 231a extends in the longitudinal direction X of the lower absorbent body 23 a. The openings 231a are formed only in the substantially central region in the longitudinal direction X of the lower absorbent body 23a, without extending to the respective end edges in the longitudinal direction X of the lower absorbent body 23 a.

Each opening 231a is formed at a position that is bilaterally symmetric with respect to the longitudinal center line of the lower absorbent body 23 a. The opening 231a has a substantially arcuate elongated shape defined by a straight portion 231b and an arc portion 231c connected to each end of the straight portion 231 b. In each opening 231a, the straight portion 231b is located outward in the width direction Y of the lower absorbent body 23a, and the arcuate portion 231c is located inward in the width direction Y of the lower absorbent body 23 a.

On the other hand, in the upper absorbent body 23b formed in a substantially T-shape, the leg portions 232a are positioned in the region between the pair of openings 231a of the lower absorbent body 23 a. The length of the leg 232a is substantially the same as the length of the opening 231 a. The head 232b of the upper absorbent body 23b is located in the region on the ventral side of the lower absorbent body 23 a. The width of the head 232b is narrower than the width of the lower absorbent body 23 a.

The absorbent core 23 having the lower absorbent body 23a and the upper absorbent body 23b has a central absorbent body 23c and a pair of side absorbent bodies 23d arranged on both side portions of the central absorbent body 23c and extending in the longitudinal direction X in plan view. The central absorbent body 23c and the side absorbent bodies 23d are separated by the opening 231 a. The openings 231a separating the central absorbent body 23c and the side absorbent bodies 23d function as bending guides in the absorbent core 23 for bending and raising the side absorbent bodies 23 d.

As shown in fig. 4(a), the absorbent body 20 including the absorbent core 23 includes a front sheet 21 covering the skin-facing surface of the absorbent core 23 and a back sheet 22 covering the non-skin-facing surface of the absorbent core 23. The front sheet 21 is a liquid-permeable sheet and faces the skin of the wearer when the diaper 10 is worn. The topsheet 21 has extended portions 21E extending outward in the width direction from both side edges of the absorbent core 23, and the extended portions 21E are folded back on the non-skin-facing surface side of the absorbent core 23 and also cover the non-skin-facing surface of the absorbent core 23. The side edge 21E' of the extended portion 21E passes over the opening 231a of the absorbent core 23 and reaches substantially the central absorbent body 23 c. The term "substantially" includes both a case where the side edge 21E 'of the extended portion 21E reaches the central absorbent body 23c and a case where the distance between the side edge 21E' and the side edge of the central absorbent body 23c is 10mm or less. The back sheet 22 covers the entire region in the longitudinal direction X of the absorbent core 23 and also covers the entire region in the width direction Y. The back sheet 22 is made of a liquid-impermeable or water-repellent sheet and faces the outer cover 30. An adhesive 22a is applied to the non-skin-facing surface of the back sheet 22, and the absorbent main body 20 and the exterior body 30 are fixed by the adhesive 22 a. The adhesive 22a is applied at a position opposed to the absorbent core 23.

As shown in fig. 4(a), both the skin-facing surface and the non-skin-facing surface of the absorbent core 23 are covered with the covering sheet 24, and the absorbent core 23 and the covering sheet 24 form an absorbent body 25. Depending on the specific form of the absorbent body 25, both the skin-facing surface and the non-skin-facing surface of the absorbent core 23 may not be covered with the covering sheet 24. Elastic members 25' extending in the longitudinal direction X are disposed along the left and right side edges of the absorber 25 in an extended state. The elastic member 25' is disposed over substantially the entire length of the absorbent core 23. The elastic member 25' is positioned between the topsheet 21 and the cover sheet 24 constituting the absorbent member 25, and is joined to the two sheets. The elastic member 25' is used for the purpose of assisting the bending and raising of the side absorbent member 23 d. The "substantially entire length" includes not only the case where the elastic member 25 'is disposed over the entire length of the absorbent core 23 but also the case where the elastic member 25' is disposed over a length of 60% to 100% of the entire length of the absorbent core 23.

The front sheet 21 and the back sheet 22 are not particularly limited, and the same materials as those currently used in the art may be used. For example, a liquid-permeable nonwoven fabric or a perforated film can be used as the front sheet 21. As the back sheet 22, a non-liquid-permeable film made of a synthetic resin, a nonwoven fabric having high water repellency against water pressure such as a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used. In the case where the back sheet 22 is liquid impermeable, the sheet 22 may also have water vapor permeability. From the viewpoint of leakage resistance and air permeability, the back sheet 22 preferably has a water vapor permeable synthetic resin liquid impermeable film. The absorbent core 23 may be composed of a mixture of liquid-absorbent fibers including cellulose fibers such as pulp and particles including hydrogel materials such as super absorbent polymers, or the mixture may be covered with a liquid-permeable sheet including tissue paper (tissue paper) and/or nonwoven fabric. The lower absorbent body 23a and the upper absorbent body 23b constituting the absorbent core 23 may be composed of materials of the same composition, or may be composed of materials of different compositions.

As shown in fig. 4(a), the absorbent main body 20 has a pair of containment flaps 40, 40 on both side portions in the longitudinal direction X of the diaper. The containment barriers 40 are formed as follows: the sheet 42 having a rectangular water repellent property is folded in half, and the side region of the sheet 42 in the folded state is disposed between the extension portions 21E of the back sheet 22 and the front sheet 21, and the fold line of the sheet 42 in the folded state is located outward in the width direction Y. The sheet 42 constituting the leakage-preventing barrier 40 is joined to the extended portion 21E of the topsheet 21 with the adhesive 40a on the non-skin-facing surface side of the side absorbent body 23d of the absorbent body 25. In other words, the extended portion 21E of the front sheet 21 is joined to the sheet 42, which is a member located closer to the outer package 30 than the extended portion 21E and adjacent to the extended portion 21E. By this joining, a joining portion 43 extending in the longitudinal direction X is formed. The joining portion 43 is located further outward in the width direction Y than the curve guide portion formed by the opening 231a, and the joining portion 43 is not formed further inward in the width direction Y than the curve guide portion. The sheet 42 constituting the leakage-preventing barrier 40 is also joined to the skin-facing surface of the back sheet 22 with an adhesive (not shown).

As shown in fig. 4b, which is an enlarged view of a main portion of fig. 4a, the joining portion 43 formed by the adhesive 40a on the non-skin-facing surface side of the side absorbent body 23d is formed not over the entire region in the width direction Y of the side absorbent body 23d but in a region biased toward the opening 231a (hereinafter, this region is referred to as "joining region 43 a"). The adhesive 40a is not applied to the region outward in the width direction Y from the joined region 43a, and the extended portion 21E of the topsheet 21 and the sheet 42 constituting the leakage protector 40 are in a non-joined state (hereinafter, this region is referred to as "non-joined region 43 b"). In this way, the joined region 43a and the non-joined region 43b are provided in the non-skin-facing surface side of the side absorbent body 23d in the width direction Y from the inside to the outside.

The elastic member 41a is fixed to the sheet 42 in an extended state at the free end 40' of the leakage protector 40, i.e., at the position of the fold line of the sheet 42 in the folded state. The elastic member 41b is fixed to the sheet 42 in an extended state at the fixed end of the leakage protection panel 40, i.e., at the joint between the sheet 42 and the back sheet 22. When the

elastic members

41a and 41b contract, the leakage preventive cuffs 40 stand up toward the body of the wearer when the diaper 10 is worn.

Fig. 5 is a cross-sectional view in the width direction of the diaper 10 shown in fig. 1 to 4 in a worn state. As shown in the figure, in the absorbent core 23 of the diaper 10, the side absorbent members 23d in the absorbent core 23 are bent so as to be separated from the outer package 30 from the bend guide portions formed by the openings 231a by contraction of the elastic members 25'. In this case, when the cover sheet 24 on the skin-facing surface side and the cover sheet 24 on the non-skin-facing surface side are joined by a joining method such as an adhesive in the bending guide portion formed by the opening 231a, bending of the side absorbent body 23d starting from the bending guide portion occurs smoothly. As a result thereof, bending at an undesired position of the absorbent core 23 can be effectively prevented.

When the side absorbent body 23d is curved toward the body of the wearer starting from the curve guide portion, the entire side absorbent body 23d is not curved in the same manner, and the degree of curvature differs depending on the region in the width direction Y. Specifically, the side absorbent body 23d has different degrees of bending with respect to the central absorbent body 23c between the portion corresponding to the joined region 43a and the portion corresponding to the non-joined region 43b shown in fig. 4 (b). The reason for this is as follows. As described above, in the side absorbent body 23d, the extended portion 21E of the top sheet 21 and the sheet 42 constituting the leakage-preventing barrier 40 are joined at the position of the joint portion 43 on the non-skin contact surface side. When the side absorbent body 23d is bent from the bend guide portion in this joined state, the bending of the portion of the side absorbent body 23d corresponding to the joined region 43a is restricted by the joining, and the side absorbent body 23d preferentially bends between the elastic member 25' and the joined portion 43 in the width direction Y, that is, the portion corresponding to the non-joined region 43 b.

For the above reasons, as shown in fig. 5, the side absorbent body 23d is bent and deformed relative to the center absorbent body 23c, and the side absorbent body 23d itself is bent in a substantially L-shape so as to protrude outward in the width direction. By the absorbent core 23 being thus bent in two stages, in the diaper 10 of the present embodiment, even if an excessive external force is applied to the absorbent core 23 by the action of the wearer, particularly the rapid and violent opening and closing action often observed in the low-age infant, in the worn state, the space formed by the central absorbent body 23c and the side absorbent bodies 23d, that is, the width and height can be stably maintained on the skin-facing surface side of the diaper 10. As a result thereof, the receptivity of excrement can be improved, and the side leakage of the received excrement can be effectively prevented.

In particular, in the present embodiment, since the fixed end of the leakage-preventing barrier 40 is provided on the non-skin-facing side of the absorbent body 25, there is an advantage that the rising of the leakage-preventing barrier 40 promotes the two-stage bending of the side absorbent body 23 d. In particular, as shown in fig. 4 and 5, when the fixed end of the leakage-preventing containment flaps 40 is positioned further outward in the width direction Y than the joining portion 43 between the extended portion 21E of the topsheet 21 and the sheet 42 constituting the leakage-preventing containment flaps 40, the substantially L-shaped bending deformation of the side absorbent body 23d is further promoted, which is advantageous. Further, when the elastic member 41b is disposed at the fixed end of the leakage-preventing barrier 40 or at a position near the fixed end, the substantially L-shaped bending deformation of the side absorbent body 23d erected by the leakage-preventing barrier 40 is further promoted, which is particularly preferable.

As described above, the leg elastic members 34 are disposed in the outer package 30 of the diaper 10 (see fig. 2). As for the positional relationship between the leg elastic members 34 and the joining portions 43, as shown in fig. 4 and 5, when the leg elastic members 34 are positioned further outward in the width direction Y than the joining portions 43 in the crotch portion C of the outer cover 30, the deformation force generated in the outer cover 30 by the contraction of the leg elastic members 34 is transmitted to the absorbent main body 20, and therefore, the substantially L-shaped bending deformation of the side absorbent body 23d can be further promoted, which is preferable. In this case, as shown in fig. 2, when the leg elastic members 34 are disposed along the periphery of the crotch portion C of the outer cover 30, the deformation force generated in the outer cover 30 by the contraction of the leg elastic members 34 is more easily transmitted to the absorbent main body 20, which is advantageous.

As described above, the leg elastic members 34 are disposed separately in the front side portion a and the back side portion B of the outer package 30 (see fig. 2 and 6). As shown in fig. 6, the position T1 at which the abdomen-side leg elastic member 34A intersects with the side edge of the absorbent core 23 and the position T2 at which the back-side leg elastic member 34B intersects with the side edge of the absorbent core 23 are different. Therefore, when the

elastic members

34A and 34B contract, the deformation force generated in the exterior body 30 by the contraction is generated in the directions D1 and D2 opposite to each other toward the extending direction of the

elastic members

34A and 34B. In this way, since the deformation forces act in different directions from different intersection positions T1 and T2 in the side absorbent body 23d, the side absorbent body 23d can be effectively prevented from undesirably falling toward the central absorbent body side.

In particular, as shown in fig. 2 and 6, when the positions T1, T2 at which the abdomen-side leg elastic member 34A and the back-side leg elastic member 34B intersect with the absorbent core 23 are different from each other, and the intersection position T3 of the

elastic members

34A, 34B is offset toward the abdomen-side a from the position at which the diaper 10 is divided into front and rear halves in the longitudinal direction X, the space formed by the curved side absorbent body 23d and the center absorbent body 23c can be sufficiently secured, the excrement receiving performance can be further improved, and the side leakage of the received excrement can be more effectively prevented.

As described above, the leg elastic members 34 intersect the front-side leg elastic member 34A and the back-side leg elastic member 34B at positions inward in the width direction Y from the side edges of the absorbent main body 20. In the crotch portion C of the diaper 10, the outer package 30 has a non-stretchable region 36 in the widthwise central region thereof. That is, the leg elastic members 34 are joined to the exterior body 30 at the widthwise outer sides of the non-stretchable region 36. Further, a region of the joint portion between the leg elastic member 34 and the exterior body 30, which region is located further outward in the width direction than the width direction inner end 34E, is an expansion/contraction region. In this way, in the present embodiment, the widthwise inner end 34E of the stretchable region of the leg elastic member 34 is disposed inward of the extended portion 21E of the topsheet 21 and the widthwise outer end of the joint portion 43 of the sheet 42, which is a member adjacent to the extended portion 21E. In addition, a part of the stretch region of the leg elastic member 34 intersects with the widthwise outer end of the joint portion 43. Therefore, when the front-side leg elastic member 34A and the back-side leg elastic member 34B contract, the deformation force generated in the exterior body 30 by the contraction is generated in the mutually opposite directions D1, D2 in the extending direction of these

elastic members

34A, 34B, and the deformation force further acts up to the vicinity of the widthwise central region of the exterior body 30. As a result, the side absorbent bodies 23d can be effectively prevented from undesirably falling toward the center absorbent body 23c side.

In addition to the leg elastic members 34, waist elastic members 35 are disposed on the outer package 30 of the diaper 10. As shown in fig. 6, the waist elastic member 35 is partially overlapped with the leg elastic members 34 of the waist elastic member 35 when the exterior body 30 is viewed in plan. Specifically, in the exterior body 30, the waist elastic member 35 and the leg elastic member 34 are disposed so as to overlap each other at a portion where the side seal portion S is formed and a portion in the vicinity thereof. By disposing the

elastic members

34 and 35 in such a relationship, the deformation force generated by contraction of the

elastic members

34 and 35 can be effectively transmitted to the side absorbent body 23d, and the substantially L-shaped bending deformation of the side absorbent body 23d can be further promoted, which is preferable.

In the diaper 10, the skin-facing surface preferably has an uneven structure in a region in the width direction Y from a part of the side absorbent member 23d on one side to a part of the side absorbent member 23d on the other side in the topsheet 21 constituting the absorbent main body 20. The reason is that the side absorbent body 23d is less likely to undesirably fall down toward the central absorbent body side due to the presence of the uneven structure. The uneven structure of the topsheet 21 preferably covers the entire region in the width direction Y of the central absorbent body 23c and the opening 231a, and also covers the side absorbent bodies 23d at positions near the opening 231 a. From the viewpoint of more effectively preventing the side absorbent bodies 23d from falling down, it is advantageous that the uneven structure of the topsheet 21 is a bulky structure having a thickness. For example, japanese patent application laid-open No. 2004-174234 describes a front surface sheet having such an uneven structure. The topsheet disclosed in this publication has an upper layer made of a sheet-like material and facing the skin of the wearer, and a lower layer made of a sheet-like material and disposed on the absorbent body side, wherein the upper layer and the lower layer are partially joined to form a plurality of joined portions, and the upper layer protrudes toward the skin of the wearer at portions other than the joined portions to form a plurality of projections having a hollow interior.

From the viewpoint of sufficiently securing the space formed by the curved side absorbent body 23d and the center absorbent body 23c, it is preferable that the side absorbent body 23d has a lower grammage than the center absorbent body 23 c. In this case, the grammage (g/m) of the side absorbent body 23d²) Grammage (g/m) of the central absorbent body 23c²) Preferably 20% or more, particularly preferably 35% or more, preferably 80% or less, and particularly preferably 65% or less. For example, the grammage (g/m) of the side absorbent body 23d²) Grammage (g/m) of the central absorbent body 23c²) Preferably 20% to 80%, and particularly preferably 35% to 65%. In the present embodiment, when the central absorbent body 23c is formed of a laminate structure of the lower absorbent body 23a and the upper absorbent body 23b, the grammage of the central absorbent body 23c is the total grammage of the lower absorbent body 23a and the upper absorbent body 23b corresponding to the central absorbent body 23 c.

From the same viewpoint as described above, it is preferable that the side absorbent bodies 23d have a smaller thickness than the central absorbent body 23 c. In this case, the thickness (mm) of the side absorbent body 23d is preferably 10% or more, particularly preferably 20% or more, preferably 70% or less, particularly preferably 60% or less, with respect to the thickness (mm) of the central absorbent body 23 c. For example, the thickness (mm) of the side absorbent body 23d is preferably 10% to 70%, particularly preferably 20% to 60%, of the thickness (mm) of the central absorbent body 23 c. In the present embodiment, when the central absorbent body 23c is formed of a laminate structure of the lower absorbent body 23a and the upper absorbent body 23b, the thickness of the central absorbent body 23c is the total thickness of the lower absorbent body 23a and the upper absorbent body 23b corresponding to the central absorbent body 23 c. The thickness was measured under no load using a CCD laser displacement meter (KEYENCE, LK-080).

Fig. 7 to 9 show other embodiments of the diaper of the present invention. The embodiments shown in fig. 1 to 6 are described in detail as appropriate for the aspects not specifically described in these embodiments. In fig. 7 to 9, the same components as those in fig. 1 to 6 are denoted by the same reference numerals. In the diaper 10 of the embodiment shown in fig. 7 to 9, the members to be joined to the extension portion 21E of the topsheet 21 are different from those of the embodiment shown in fig. 1 to 6. Hereinafter, each embodiment will be described in detail.

In the diaper 10 of the embodiment shown in fig. 7, the extended portion 21E of the front sheet 21 is joined to the back sheet 22, which is a member located closer to the outer package 30 than the extended portion 21E and adjacent to the extended portion 21E. The two are joined by the adhesive 40a, thereby forming a joint portion 43. In the present embodiment, the fixing portions of the leakage preventive cuffs 40 are located on both side portions of the back sheet 22.

In the diaper 10 of the embodiment shown in fig. 8, the back sheet 22 is disposed between the inner sheet 31 and the outer sheet 32 of the outer package 30. Of these sheets, the sheet facing the absorbent body 25 is an inner sheet 31. Therefore, the extended portion 21E of the front sheet 21 is joined to the inner sheet 31, which is a member located closer to the outer package 30 than the extended portion 21E and adjacent to the extended portion 21E. The two are joined by the adhesive 40a, thereby forming a joint portion 43. In the present embodiment, the fixing portions of the leakage barriers 40 are located on both sides of the inner sheet 31.

The outer package 30 of the diaper 10 of the embodiment shown in fig. 9 has a single-layer structure. The exterior body 30 also serves as a back sheet. Therefore, the extended portion 21E of the front sheet 21 is joined to the single-layer outer package 30. The two are joined by the adhesive 40a, thereby forming a joint portion 43. In the present embodiment, the fixing portions of the leakage-proof guards 40 are located on both side portions of the exterior body 30.

In the above embodiments shown in fig. 7 to 9, the same advantageous effects as those of the embodiments shown in fig. 1 to 6 can be achieved.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. For example, the diaper according to each of the above embodiments is a pants-type disposable diaper of a type in which the outer cover 30 is divided into the front side sheet member 30A and the back side sheet member 30B as shown in fig. 10, in addition to the outer cover 30 having the

sheets

31 and 32 continuous over the entire length in the longitudinal direction from the front side portion a to the back side portion B.

The present invention also discloses the following underpants type disposable diaper with respect to the above embodiment.

＜1＞

A pants-type disposable diaper having an absorbent core and an outer covering disposed outside the absorbent core,

the absorbent core has a central absorbent body and a pair of side absorbent bodies arranged on both sides of the central absorbent body and extending in the longitudinal direction, and curved guide sections each formed by an opening extending in the longitudinal direction are provided between the central absorbent body and the pair of side absorbent bodies,

＜2＞

The underpants type disposable diaper according to < 1 > above, wherein a joining region between the extended portion and the member adjacent to the extended portion, and a non-joining region between the extended portion and the member are provided side by side in a width direction on a non-skin-facing surface side of the side absorbent body.

＜3＞

The underpants type disposable diaper as described in the above < 1 > or < 2 >, wherein,

the outer package has a front side portion disposed on the front side of the wearer when the diaper is worn, a back side portion disposed on the back side of the wearer, and a crotch portion located therebetween,

the outer covering body has leg elastic members in the crotch portion and at positions further outward in the width direction than the joining positions of the extended portion and the members adjacent to the extended portion.

＜4＞

The underpants type disposable diaper according to < 3 > above, wherein the leg elastic members are disposed along leg opening edges of the crotch portion of the outer package.

＜5＞

The underpants type disposable diaper as described in the above < 3 > or < 4 >, wherein,

the leg elastic members are individually disposed in the front side portion and the back side portion of the exterior body,

the position where the leg elastic member disposed on the front side portion intersects with the side edge of the absorbent core is different from the position where the leg elastic member disposed on the back side portion intersects with the side edge of the absorbent core.

＜6＞

The underpants type disposable diaper according to any one of the above < 3 > -5 >, wherein a widthwise inner end of the stretchable region of the leg elastic member is disposed inward of a widthwise outer end of a joint portion between the extended portion of the front sheet and a member adjacent to the extended portion, and a part of the stretchable region of the leg elastic member intersects with the widthwise outer end of the joint portion.

＜7＞

The underpants type disposable diaper according to any one of the above < 3 > -6 >, wherein a position where the leg elastic member disposed in the abdomen side portion intersects with the side edge of the absorbent core and a position where the leg elastic member disposed in the back side portion intersects with the side edge of the absorbent core are biased to the abdomen side portion.

＜8＞

The underpants type disposable diaper according to < 7 > wherein a position where the leg elastic member disposed in the abdomen side portion and the leg elastic member disposed in the back side portion intersect each other is offset to the abdomen side portion side from a position where the diaper is divided into front and rear halves in the longitudinal direction.

＜9＞

The underpants type disposable diaper as described in any one of the above < 3 > - < 8 >, wherein,

the outer covering has a waist elastic member extending in the width direction at a position further outward in the width direction than both side edges of the absorbent main body in the stomach-side portion or the back-side portion,

a part of the waist elastic member overlaps a part of the leg elastic member when the diaper is viewed in a plan view in an unfolded state.

＜10＞

The underpants type disposable diaper as described in any one of the above < 1 > - < 9 >, wherein,

the skin-facing surface and the non-skin-facing surface of the absorbent core are covered with a covering sheet,

in the bending guide portion of the absorbent core, the cover sheet on the skin-facing surface side is joined to the cover sheet on the non-skin-facing surface side.

＜11＞

The underpants type disposable diaper according to any one of the above < 1 > -10 >, wherein the front sheet has an uneven structure in a region in a width direction from a part of the side absorbent body on one side to a part of the side absorbent body on the other side.

＜12＞

The underpants type disposable diaper according to any one of the above < 1 > -11 >, wherein the side absorbent body of the absorbent core has a lower grammage than the center absorbent body.

＜13＞

The underpants type disposable diaper according to any one of the above < 1 > -12 >, wherein the outer package has a non-stretchable region in a central region in a width direction of the outer package in a crotch portion of the diaper.

＜14＞

The underpants type disposable diaper according to any one of the above < 1 > -13 >, wherein the bending guide portion extends in the longitudinal direction of the absorbent core, does not extend to each end edge in the longitudinal direction of the absorbent core, and is formed only in a substantially central region in the longitudinal direction X of the absorbent core.

＜15＞

The underpants type disposable diaper as described in any one of the above < 1 > - < 14 >, wherein,

the bending guide portions are formed at positions which are bilaterally symmetrical with respect to the longitudinal center line of the absorbent core,

the curved guide portion has a substantially arcuate elongated shape defined by a straight portion and an arc portion connected to each end of the straight portion,

in the curved guide portion, the straight portion is located outward in the width direction of the absorber, and the arcuate portion is located inward in the width direction of the absorber.

＜16＞

The underpants type disposable diaper according to any one of the above < 1 > -15 >, wherein a side edge of the extended portion extends over the curved guide portion and reaches substantially the center absorbent body.

＜17＞

The underpants type disposable diaper as described in any one of the above < 1 > - < 16 >, wherein,

a pair of leakage-proof guards are arranged at two side parts along the length direction,

the sheet constituting the leakage preventive cuffs is joined to the extended portions on the non-skin-facing side of the side absorbent body with an adhesive.

＜18＞

The underpants type disposable diaper according to < 17 > above, wherein a joint portion between the extension portion formed by the adhesive and the sheet in the non-skin-facing surface side of the side absorbent body is formed not over the entire width direction of the side absorbent body but in a region biased to the bend guide portion side.

＜19＞

The underpants type disposable diaper according to any one of the above < 1 > -18 >, wherein no adhesive is applied to a region located laterally outward of the joined region of the extension portion and the member adjacent to the extension portion, and the extension portion and the member adjacent to the extension portion are in a non-joined state.

＜20＞

The underpants type disposable diaper according to any one of the above < 1 > - < 19 >, wherein the side absorbent body is bent and deformed relative to the center absorbent body, and the side absorbent body is bent so as to form a substantially L-shape.

＜21＞

The underpants type disposable diaper as described in any one of the above < 1 > - < 20 >, wherein,

the sheet constituting the leakage preventive cuffs is joined to the extended portions on the non-skin-facing side of the side absorbent body,

the fixed end of the leakage preventive guard is located outward in the width direction of the joint between the extended portion and the sheet.

＜22＞

The underpants type disposable diaper as described in any one of the above < 1 > - < 21 >, wherein,

an elastic member is disposed at or near a fixed end of the leakage preventive cuff.

Industrial applicability

As described above in detail, according to the pants-type disposable diaper of the present invention, even if the wearer opens and gathers the legs vigorously in the worn state, a wide space for accommodating excrement and preventing leakage thereof can be maintained stably.

Claims

1. A pants-type disposable diaper having an absorbent core and an outer covering disposed outside the absorbent core, characterized in that:

the diaper has a pair of containment flaps on both side portions of the absorbent core in the longitudinal direction of the diaper,

the fixed end of the leakage preventive barrier is arranged closer to the non-skin-facing side than the absorbent core,

the extended portion of the front sheet is joined to a member which is located closer to the outer casing than the extended portion and adjacent to the extended portion, the member adjacent to the extended portion being a sheet constituting the leakage-preventing barrier,

wherein a joining position of the extended portion and the sheet is located further outward in a width direction than the bend guide portion, and the extended portion and the sheet are not joined inward in the width direction than the bend guide portion, and the extended portion and the sheet cross the bend guide portion of the absorbent core in the width direction,

elastic members are arranged along both side edges of the absorbent core, and the side absorbers are bent between the elastic members and the joining positions.

2. A pants-type disposable diaper according to claim 1, characterized in that:

the extended portion and the member adjacent to the extended portion are joined at a joining position and a non-joining position in the width direction to each other on the non-skin-facing surface side of the side absorbent body.

3. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the outer covering body has leg elastic members in the crotch portion and at positions further outward in the width direction than the joining position of the extended portion and the member adjacent to the extended portion.

4. A pants-type disposable diaper according to claim 3, characterized in that:

the leg elastic member is disposed along a leg opening edge of the crotch portion of the outer package.

5. A pants-type disposable diaper according to claim 3, characterized in that:

the leg elastic members are disposed individually in the front side portion and the back side portion of the outer package,

the positions at which the leg elastic members disposed in the stomach-side portion intersect the side edges of the absorbent core are different from the positions at which the leg elastic members disposed in the back-side portion intersect the side edges of the absorbent core.

6. A pants-type disposable diaper according to claim 3, characterized in that:

the inner end in the width direction of the stretchable region of the leg elastic member is disposed more inward than the outer end in the width direction of the joining position between the extended portion of the topsheet and the member adjacent to the extended portion, and a part of the stretchable region of the leg elastic member intersects with the outer end in the width direction of the joining position.

7. A pants-type disposable diaper according to claim 5, characterized in that:

the positions where the leg elastic members disposed on the abdomen side portion intersect with the side edges of the absorbent core and the positions where the leg elastic members disposed on the back side portion intersect with the side edges of the absorbent core are biased toward the abdomen side portion.

8. A pants-type disposable diaper according to claim 7, wherein:

the position at which the leg elastic member disposed in the abdomen side portion intersects with the leg elastic member disposed in the back side portion is offset to the abdomen side portion side from the position at which the diaper is divided into front and rear halves in the longitudinal direction.

9. A pants-type disposable diaper according to claim 3, characterized in that:

the outer package has a waist elastic member extending in the width direction at a position further outward in the width direction than both side edges of the absorbent core in the abdominal section or the back section,

a part of the waist elastic member overlaps a part of the leg elastic member when the diaper is viewed from above in an unfolded state.

10. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

11. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the skin-facing surface has an uneven structure in a region in the width direction from a portion of the side absorbent body on one side to a portion of the side absorbent body on the other side in the front sheet.

12. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the side absorbent bodies of the absorbent core have a lower grammage than the central absorbent body.

13. A pants-type disposable diaper according to claim 3, characterized in that:

the outer cover has a non-stretchable region in a central region in a width direction of the outer cover in a crotch portion of the diaper.

14. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the bending guide portion extends in the longitudinal direction of the absorbent core, does not extend to each end edge in the longitudinal direction of the absorbent core, and is formed only in a substantially central region in the longitudinal direction of the absorbent core.

15. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the bending guide portions are formed at positions which are bilaterally symmetrical with respect to a longitudinal center line of the absorbent core,

in the curved guide portion, the straight portion is located outward in the width direction of the absorbent core, and the arcuate portion is located inward in the width direction of the absorbent core.

16. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the side edge of the extended portion extends over the curved guide portion and reaches the central absorbent body approximately.

17. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the sheet constituting the leakage preventive cuffs is joined to the extended portions on the non-skin-facing surface side of the side absorbent body with an adhesive.

18. A pants-type disposable diaper according to claim 17, wherein:

the joining position of the extension portion formed by the adhesive and the sheet on the non-skin-facing surface side of the side absorbent body is not formed over the entire width direction of the side absorbent body, but is formed in a region biased to the bend guide portion side.

19. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the adhesive is not applied to a region located outside in the width direction of the joining position between the extended portion and the member adjacent to the extended portion, and the extended portion and the member adjacent to the extended portion are in a non-joined state.

20. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the side absorbent body is bent and deformed relative to the central absorbent body, and the side absorbent body is bent so as to form a substantially L-shape.

21. A pants-type disposable diaper according to claim 1 or 2, characterized in that:

the fixed end of the leakage preventive guard is positioned further outward in the width direction than the joint position between the extended portion and the sheet.

22. A pants-type disposable diaper according to claim 1 or 2, characterized in that: