WO2016063638A1

WO2016063638A1 - Underwear-type disposable diaper

Info

Publication number: WO2016063638A1
Application number: PCT/JP2015/075134
Authority: WO
Inventors: いづみ神山; 優子福田
Original assignee: 花王株式会社
Priority date: 2014-10-20
Filing date: 2015-09-03
Publication date: 2016-04-28

Abstract

An absorbent core (23) of an underwear-type disposable diaper (10) is provided with a central absorbent body (23c) and side absorbent bodies (23d) and has bending guide portions therebetween that comprise openings that extend in the longitudinal direction X. The absorbent core (23) is covered by a surface sheet (21). Extending sites (21E) where the surface sheet (21) extends towards the non-skin-facing-surface side are joined to members (42) that are located closer to an outer body (30) than the extending sites (21E) and that are adjacent to the extending sites (21E). Joints (43) between the extending sites (21E) and the members (42) are located outward of the bending guide portions in the width direction Y. Elastic members (25') are arranged at both side edges of the absorbent core (23) and the side absorbent bodies (23d) are bent between the elastic members (25') and the joints (43).

Description

Pants-type disposable diaper

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

TECHNOLOGY Known to raise the right and left sides of the absorbent body of a disposable diaper toward the wearer's body to improve the fit of the diaper and prevent side leakage of liquid. For example, in Patent Document 1, the base end portion of the three-dimensional gather is fixed to the non-skin facing surface on both sides of the absorbent body, and the contraction force of the yarn elastic elastic member attached to the three-dimensional gather is used. It is described that the side portion of the absorber is bent and erected. In this diaper, a portion of the surface sheet that extends outward from the side edge of the absorber extends to the back surface side of the absorber and is fixed, and the extended surface sheet and the three-dimensional gather Is fixed on the back side of the absorber.

In addition to the technique described in Patent Document 1, a technique is also known in which an absorbent body is deformed by providing a bending induction part in the absorbent body of a disposable diaper. For example, Patent Document 2 describes that a bending guide portion is formed at a predetermined position from a center line that bisects the absorbent body in the longitudinal direction to a rear edge on the back body side. The bending guide portions are provided on both sides of the absorber along the longitudinal center line at the position of the central portion in the longitudinal direction.

JP 2001-340380 A JP 2008-012197 A

In the disposable diaper of the type which bends an absorber as described in patent document 1 and patent document 2, the operation | movement which opens and closes a leg frequently like a young child is often performed. Due to the movement, the standing absorber may tend to fall down inward. As a result, the space for receiving the excrement becomes narrow, and as a result, the excrement may not be accepted or the excrement may get over the fallen absorber and leak out.

The present invention is a pants-type disposable diaper comprising an absorbent core and an exterior body arranged on the outside thereof,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies that are disposed on both sides of the central absorbent body and extend in the longitudinal direction, and the central absorbent body and the pair of side absorbent bodies Between each of them, there is a bending guide part consisting of an opening extending in the longitudinal direction,
The absorbent core has a skin-facing surface coated with a surface sheet, and the surface sheet has extending portions extending outward in the width direction from both side edges of the absorbent core. The part is folded back to the non-skin facing surface side of the absorbent core, covering the non-skin facing surface,
The extension part of the surface sheet is located on the exterior body side of the extension part and joined to a member adjacent to the extension part,
The joining position of the extension part and the member adjacent to the extension part is outside in the width direction from the bending guide part,
Provided is a pants-type disposable diaper in which elastic members are arranged along both side edges of the absorbent core along the side edges so that the side absorbent body is bent between the elastic members and the joining position. To do.

FIG. 1 is a perspective view showing an 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 top sheet side when the diaper shown in FIG. 3 (a) is a plan view of the absorbent core in the diaper shown in FIG. 1, FIG. 3 (b) is a cross-sectional view taken along the line bb in FIG. 3 (a), and FIG. FIG. 4 is a cross-sectional view taken along the line cc in FIG. 4A is a cross-sectional view taken along line IV-IV in FIG. 2, and FIG. 4B is an enlarged view of a main part in FIG. 4A. FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 6 is a plan view (corresponding to FIG. 2) showing an arrangement state of the elastic members. FIG. 7 is a cross-sectional view (corresponding to FIG. 5) showing another embodiment of the diaper of the present invention. FIG. 8 is a cross-sectional view (corresponding to FIG. 5) showing still another embodiment of the diaper of the present invention. FIG. 9 is a cross-sectional view (corresponding to FIG. 5) showing still another embodiment of the diaper of the present invention. FIG. 10 is a perspective view showing still another embodiment of the diaper of the present invention.

The present invention relates to improvement of disposable diapers, and more particularly to a pants-type disposable diaper that can stably maintain a wide space for receiving excrement.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The perspective view of one Embodiment of the underpants type disposable diaper of this invention is shown by FIG. FIG. 2 is a plan view of the diaper shown in FIG. 1 as viewed from the top sheet side in a state where the diaper is opened at the side seal portion S and developed in a plane. The diaper 10 shown in FIGS. 1 and 2 is a so-called pants-type diaper. The diaper 10 includes an absorbent main body 20 and an exterior body 30 located on the non-skin contact surface side of the absorbent main body 20. The diaper 10 is divided into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the wearer's dorsal side, and a crotch C positioned therebetween. 10, the direction extending from the ventral side A to the back side B is referred to as the longitudinal direction X, and the direction orthogonal thereto is referred to as the width direction Y. The crotch portion C is a region in which a side edge of an exterior body 30 to be described later is bound inward in the width direction Y, and is arranged in a crotch portion of the wearer when the diaper 10 is worn. The back side portion A is a region located on the abdomen side of the wearer from the crotch portion C when the diaper 10 is worn. The back side portion B is a region located on the back side of the wearer from the crotch portion C when the diaper 10 is worn.

In the present invention, the “skin facing surface side” is a side (surface) arranged on the skin side of the wearer in the wearing state of the diaper 10 among the front and back sides (surfaces) of each member of the diaper 10. . The “non-skin contact surface side” is a side (surface) disposed on the opposite side of the skin side of the wearer in the wearing state of the diaper 10 among the front and back sides (surfaces) of each member of the diaper 10. In the following description, the “longitudinal direction” is a direction parallel to the long side of each member. In the following description, the term “width direction” may be used, which is a direction orthogonal to the longitudinal direction.

The absorbent main body 20 has a vertically long rectangular shape, and a known joining means such as a hot-melt adhesive is used so that its longitudinal direction coincides with the longitudinal direction of the diaper 10 and extends from the ventral side A to the back side B. Thus, the outer body 30 is joined to the central portion in the width direction. In the exterior body 30, both side edge portions of the portion located on the ventral side portion A and both side edge portions of the portion located on the back side portion B are joined to each other by known joining means such as heat sealing and ultrasonic sealing. Yes. Accordingly, a pair of side seal portions S is formed on the diaper 10. Moreover, the waist opening part 11 and a pair of

leg opening parts

12 and 12 are formed in the diaper 10 by the joining, and the exterior body 30 becomes a pants-type solid shape.

As shown in FIG. 2, the exterior body 30 includes an inner layer sheet 31 and an outer layer sheet 32, and a thread-like elastic member of each part fixed between these two sheets. The elastic member of each part will be described later. The inner layer sheet 31 and the outer layer sheet 32 have the same shape in the width direction Y. In the longitudinal direction X, the outer layer sheet 32 extends from the front and rear end portions of the inner layer sheet 31, and the extended portion 32 E covers the longitudinal front and rear end regions of the absorbent main body 20. The outer edge of the exterior body 30 forms the outline of the unfolded diaper 10. The inner layer sheet 31 and the outer layer sheet 32 are preferably composed of the same or different breathable sheets, for example, non-woven fabrics manufactured by various methods.

A plurality of waist elastic members 33 extending in the width direction of the diaper 10 along the opening edge are arranged in an extended state on the waist opening edge of the exterior body 30. In addition, a plurality of leg elastic members 34 are arranged in a stretched state along the opening edge at the leg opening edge in the exterior body 30. As shown in FIG. 1, the leg elastic member 34 is not arranged in the crotch part C of the diaper 10 so as to cross the exterior body 30 in the width direction. Therefore, the exterior body 30 has a non-stretchable region in the center region in the width direction of the exterior body 30 in the crotch part C of the diaper 10.

The leg elastic member 34 is separately disposed on each of the ventral side A and the back side B of the exterior body 30 as shown in FIG. That is, the leg elastic member 34 includes a ventral leg elastic member 34A disposed on the ventral side A and a dorsal leg elastic member 34B disposed on the dorsal side B, and includes the ventral leg elastic member 34A. The leg elastic member 34B is formed of a continuous body that is separate from each other. In other words, a continuous body of elastic members extending from the ventral side A to the back side B does not exist in the exterior body 30.

As shown in FIG. 2, the crotch portion C of the diaper 10 is bound toward the inner side in the width direction Y, and the most constricted position (the position indicated by the alternate long and short dash line L in FIG. 2) is the longitudinal direction of the diaper 10. It is biased closer to the ventral side A side than the position that bisects X back and forth. Also, the position T1 where the ventral leg elastic member 34A intersects the side edge of the absorbent core 23 and the position T2 where the back side leg elastic member 34B intersects the side edge of the absorbent core 23 are not coincident. Instead, the intersection positions T1 and T2 are separate positions along the longitudinal direction X. Further, the abdominal leg elastic member 34A and the back leg elastic member 34B intersect at an inner position in the width direction Y from the side edge of the absorbent main body 20, and the

elastic members

34A and 34B intersect. The position T3 is biased closer to the ventral portion A side than the position where the diaper 10 is divided into two in the longitudinal direction X. The position T3 substantially coincides with the most narrowed position in the crotch part C (the position indicated by the alternate long and short dash line L in FIG. 2).

Between the waist elastic member 33 and the leg elastic member 34, a plurality of waistline elastic members 35 extending in the width direction Y of the diaper 10 are arranged in an extended state. The waistline elastic member 35 is arranged in an extended state at positions on the outer side in the width direction Y from both side edges of the absorbent main body 20 in the abdominal side portion A and the back side portion B of the exterior body 30. Further, the waistline elastic member 35 is disposed so as not to cross the absorbent main body 20.

The absorbent main body 20 has an absorbent core 23 as shown in FIG. 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 absorber 23b is substantially T-shaped in plan view. The lower absorbent body 23a has a size larger than that of the upper absorbent body 23b, and has a vertically long rectangular shape as a whole. The lower absorber 23a has a pair of vertically long openings 231a along the longitudinal direction X thereof. The opening 231a extends in the longitudinal direction X of the lower absorbent body 23a. The opening 231a does not extend to each edge in the longitudinal direction X of the lower absorbent body 23a, and is formed only in a substantially central region in the longitudinal direction X of the lower absorbent body 23a.

Each opening 231a is formed at a symmetrical position with respect to the longitudinal center line of the lower absorber 23a. The opening 231a has a substantially arcuate and elongated shape defined by a linear portion 231b and a circular arc portion 231c connected to each end of the linear portion 231b. In each opening 231a, the linear portion 231b is located on the outer side in the width direction Y of the lower absorbent body 23a, and the arc portion 231c is located on the inner side in the width direction Y of the lower absorbent body 23a.

Meanwhile, the leg portion 232a of the upper absorbent body 23b having a substantially T-shape is positioned in a region between the pair of openings 231a in the lower absorbent body 23a. The length of the leg portion 232a is substantially the same as the length of the opening 231a. The head 232b of the upper absorbent body 23b is located in the region on the ventral side of the lower absorbent body 23a. The width of the head 232b is slightly narrower than the width of the lower absorbent body 23a.

The absorbent core 23 including the lower absorbent body 23a and the upper absorbent body 23b includes a central absorbent body 23c and a pair of sides extending in the longitudinal direction X disposed on both sides of the central absorbent body 23c in plan view. And an absorber 23d. The central absorber 23c and the side absorber 23d are separated by an opening 231a. The opening 231a that separates the central absorbent body 23c and the side absorbent body 23d functions as a bending guide portion that bends and stands up in the absorbent core 23.

As shown in FIG. 4A, the absorbent main body 20 including the absorbent core 23 covers the surface sheet 21 that covers the skin facing surface of the absorbent core 23 and the non-skin facing surface of the absorbent core 23. And a back sheet 22. The top sheet 21 is made of a liquid-permeable sheet and faces the wearer's skin when the diaper 10 is worn. The topsheet 21 has an extended portion 21E extending outward in the width direction from both side edges of the absorbent core 23, and the extended portion 21E is folded back to the non-skin facing surface side of the absorbent core 23, The non-skin facing surface of the absorbent core 23 is also covered. The side edge 21E 'of the extension part 21E reaches the central absorbent body 23c substantially beyond the opening 231a of the absorbent core 23. “Generally” means that the side edge 21E ′ of the extension part 21E reaches the central absorber 23c, and the distance between the side edge 21E ′ and the side edge of the central absorber 23c is 10 mm or less. Including both. 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 exterior body 30. An adhesive 22 a 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 22 a is applied at a position facing the absorbent core 23.

As shown in FIG. 4 (a), the absorbent core 23 is covered with a covering sheet 24 on both the skin facing surface and the non-skin facing surface, and the absorbent core 23 and the covering sheet 24 form an absorbent body 25. ing. 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 along the side edges are arranged in an extended state on the left and right side edges of the absorber 25. The elastic member 25 ′ is disposed over almost the entire length of the absorbent core 23. The elastic member 25 ′ is located between the top sheet 25 and the covering sheet 24 constituting the absorber 25, and is joined to both sheets. The elastic member 25 ′ is used for the purpose of assisting the bending and standing of the side absorbent body 23 d described above. The “substantially full length” is not only the case where the elastic member 25 ′ is arranged over the entire length of the absorbent core 23, but also the elastic member 25 having a length of 60% to 100% with respect to the total length of the absorbent core 23. Includes cases where 'is placed.

As the top sheet 21 and the back sheet 22, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the top sheet 21, a liquid-permeable nonwoven fabric or a perforated film can be used. As the back sheet 22, a water-repellent nonwoven fabric with high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. When the back sheet 22 is liquid impermeable, the sheet 22 may have water vapor permeability. From the viewpoint of leakage prevention and breathability, the back sheet 22 is preferably a liquid-impermeable film made of a synthetic resin having water vapor permeability. The absorbent core 23 is composed of, for example, a mixture of liquid-absorbing fibers made of cellulosic fibers such as pulp and particles made of a hydrogel material such as a superabsorbent polymer, or the mixture is made of tissue paper, It is configured by being covered with a liquid-permeable sheet made of a nonwoven fabric or the like. The lower absorbent body 23a and the upper absorbent body 23b constituting the absorbent core 23 may be made of a material having the same composition, or may be made of materials having different compositions.

As shown in FIG. 4 (a), the absorbent main body 20 has a pair of leak-

proof cuffs

40, 40 on both sides along the longitudinal direction X of the diaper. The leak-proof cuff 40 is formed by folding a rectangular water-repellent sheet material 42 in two, the side regions of the sheet material 42 in a folded state, the back sheet 22, and the extended portion 21 E of the top sheet 21. And the folding line in the sheet material 42 in a folded state is positioned outside in the width direction Y. The sheet material 42 constituting the leak-proof cuff 40 is joined to the extending portion 21E of the topsheet 21 and the adhesive 40a on the non-skin facing side of the side absorbent body 23d in the absorbent body 25. In other words, the extension part 21E of the topsheet 21 is joined to the sheet material 42, which is a member located on the exterior body 30 side of the extension part 21E and adjacent to the extension part 21E. By this joining, a joining portion 43 extending in the longitudinal direction X is formed. The joint portion 43 is located further outward in the width direction Y than the bending guide portion including the opening 231a described above, and the joint portion 43 is not formed inward in the width direction Y than the bending guide portion. The sheet material 42 constituting the leak-proof cuff 40 is also bonded to the skin facing surface of the back sheet 22 by an adhesive (not shown).

As shown in FIG. 4 (b), which is an enlarged view of the main part of FIG. 4 (a), the joint portion 43 by the adhesive 40a on the non-skin facing side of the side absorbent body 23d is in the width direction Y of the side absorbent body 23d. Is formed in a region biased toward the opening 231a (hereinafter, this region is referred to as a “joining region 43a”). Adhesive 40a is not applied to the outer region in the width direction Y from the joining region 43a, and the extension portion 21E of the topsheet 21 and the sheet material 42 constituting the leak-proof cuff 40 are not joined. (Hereinafter, this region is referred to as “non-bonded region 43b”). Thus, on the non-skin facing side of the side absorbent body 23d, the joining region 43a and the non-joining region 43b are arranged in parallel along the width direction Y from the inside toward the outside.

The elastic member 41a is fixed to the sheet material 42 in an expanded state at the free end 40 'of the leak-proof cuff 40, that is, at the position of the folding line in the folded sheet material 42. In addition, an elastic member 41b is fixed to the sheet material 42 in an extended state at a fixed end of the leak-proof cuff 40, that is, at a joint position between the sheet material 42 and the back sheet 22. When these

elastic members

41a and 41b contract, the leak-proof cuff 40 stands up toward the wearer's body when the diaper 10 is worn.

FIG. 5 shows a cross-sectional view in the width direction when the diaper 10 shown in FIGS. 1 to 4 is worn. As shown in the figure, in the absorbent core 23 of the diaper 10, the side absorbent body 23 d of the absorbent core 23 starts from the bending guide portion formed by the opening 231 a due to contraction of the elastic member 25 ′. Bends away from the body 30. In this case, when the covering sheet 24 on the skin facing surface side and the covering sheet 24 on the non-skin facing surface side are bonded by a bonding means such as an adhesive in the bending guiding portion including the opening 231a, The side absorber 23d bends smoothly starting from. As a result, bending at an unintended position in the absorbent core 23 is effectively prevented.

When the side absorbent body 23d is bent toward the wearer's body starting from the bending guide portion, the entire side absorbent body 23d is not bent uniformly, and the degree of bending depends on the portion in the width direction Y. Is different. Specifically, in the side absorber 23d, the portion corresponding to the bonding region 43a shown in FIG. 4B and the portion corresponding to the non-bonding region 43b are bent with reference to the central absorber 23c. The degree of is different. The reason for this is as follows. As described above, in the side absorbent body 23d, on the non-skin contact surface side, the extension portion 21E of the topsheet 21 and the sheet material 42 constituting the leak-proof cuff 40 are joined at the position of the joint portion 43. . When the side absorber 23d is bent starting from the bending induction portion under this bonded state, bending at a portion corresponding to the bonding region 43a of the side absorber 23d is restricted due to the bonding, and side absorption is performed. The body 23d is preferentially bent between the elastic member 25 ′ and the joint portion 43 in the width direction Y, that is, a portion corresponding to the non-joint region 43b.

For the above reasons, as shown in FIG. 5, the side absorbent body 23d is bent and deformed with respect to the central absorbent body 23c, and the side absorbent body 23d itself has a substantially L shape in a direction protruding outward in the width direction. Bend to. By bending the absorbent core 23 in two stages in this way, in the diaper 10 of the present embodiment, the movement of the wearer in the wearing state, particularly the leg often observed in young children, is opened and closed violently. Even if an excessive external force is applied to the absorbent core 23 due to the operation, the space defined by the central absorbent body 23c and the side absorbent body 23d on the skin facing surface side of the diaper 10, that is, the width and the height are Maintained stably. As a result, the acceptability of excrement is improved, and the lateral excretion of the accepted excrement is effectively prevented.

In particular, in the present embodiment, since the fixed end of the leak-proof cuff 40 is provided on the non-skin facing surface side from the absorbent body 25, the two-stage bending of the side absorbent body 23d is promoted by the standing of the leak-proof cuff 40. There is an advantage of being. In particular, as shown in FIGS. 4 and 5, the fixed end of the leak-proof cuff 40 is wider than the joint portion 43 between the extended portion 21 E of the topsheet 21 and the sheet material 42 constituting the leak-proof cuff 40. Positioning outside Y is advantageous because the substantially L-shaped bending deformation of the side absorber 23c is further promoted. Further, when the elastic member 41b is disposed at the fixed end of the leak-proof cuff 40 or in the vicinity thereof, the substantially L-shaped bending deformation of the side absorbent body 23d due to the standing of the leak-proof cuff 40 is further promoted. Particularly preferred.

As described above, the leg elastic member 34 (see FIG. 2) is disposed on the outer package 30 of the diaper 10. Regarding the positional relationship between the leg elastic member 34 and the joint portion 43 described above, the leg elastic member 34 in the crotch part C of the exterior body 30 is positioned in the width direction Y more than the joint portion 43 as shown in FIGS. When positioned outward, the deformation force generated in the exterior body 30 due to the contraction of the leg elastic member 34 propagates to the absorbent main body 20, and as a result, the substantially L-shaped side absorbent body 23 c is formed. This is preferable because bending deformation is further promoted. In this case, when the leg elastic member 34 is disposed along the periphery of the crotch part C of the exterior body 30 as shown in FIG. 2, the deformation force generated in the exterior body 30 due to the contraction of the leg elastic member 34 is absorbed by the absorbent body. This is advantageous because it is more easily propagated to 20.

As for the leg elastic member 34, as described above, the leg elastic member 34 is separately disposed on each of the abdominal side A and the back side B of the exterior body 30 (see FIGS. 2 and 6). . Then, as shown in FIG. 6, a position T 1 where the ventral leg elastic member 34 A intersects the side edge of the absorbent core 23, and a position T 2 where the dorsal leg elastic member 34 B intersects the side edge of the absorbent core 23. Is different. As a result, when the

elastic members

34A and 34B contract, deformation forces generated in the exterior body 30 due to the contraction are generated in directions D1 and D2 opposite to each other in the extending direction of the

elastic members

34A and 34B. . As described above, in the side absorber 23d, the deformation force acts in different directions from different intersection positions T1 and T2, so that the side absorber 23d is not intended to fall down toward the central absorber. Is prevented.

In particular, as shown in FIGS. 2 and 6, the positions T1 and T2 at which the abdominal leg elastic member 34A and the back leg elastic member 34B intersect the absorbent core 23 are different, and the

elastic members

34A and 34B intersect. When the position T3 is biased closer to the ventral side A than the position where the diaper 10 is divided into two in the longitudinal direction X, the side absorbent body 23d and the central absorbent body 23c after bending are defined. A sufficient space can be secured, and the acceptability of the excrement is further improved, and the lateral leakage of the received excrement is more effectively prevented.

Regarding the leg elastic member 34, as described above, the abdominal side leg elastic member 34 A and the back side leg elastic member 34 B intersect at an inner position in the width direction Y from the side edge of the absorbent main body 20. ing. Moreover, in the crotch part C of the diaper 10, the exterior body 30 has the non-stretchable area | region 36 in the width direction center area. That is, the leg elastic member 34 is joined to the exterior body 30 outside the non-stretchable region 36 in the width direction. And the area | region of the width direction outer side rather than the width direction inner side edge part 34E in the junction part of the leg elastic member 34 and the exterior body 30 is an expansion-contraction area | region. Thus, in this embodiment, the width direction inner side edge part 34E in the expansion-contraction area | region of the leg elastic member 34 is the junction part of the sheet material 42 which is the above-mentioned extension site | part 21E of the surface sheet 21, and its adjacent member. 43 is disposed inside the width direction outer side end portion. In addition, a part of the expansion / contraction region of the leg elastic member 34 intersects the width direction outer side end portion of the joint portion 43. Due to these reasons, when the ventral leg elastic member 34A and the back leg elastic member 34B contract, the deformation force generated in the exterior body 30 by the contraction is directed in the extending direction of the

elastic members

34A and 34B. The deformation force is generated in directions D1 and D2 opposite to each other, and the deformation force further acts in the vicinity of the central region in the width direction of the exterior body 30. As a result, the side absorber 23d is effectively prevented from falling down toward the center absorber 23c side unintentionally.

In addition to the leg elastic member 34, a waistline elastic member 35 is disposed on the exterior body 30 of the diaper 10. In plan view of the exterior body 30, as shown in FIG. 6, in the waistline elastic member 35, a part of the waistline elastic member 35 and a part of the leg elastic member 34 overlap each other. Specifically, in the exterior body 30, the waistline elastic member 35 and the leg elastic member 34 are disposed so as to overlap each other at a site where the side seal portion S is formed and a site in the vicinity thereof. Also by arranging both

elastic members

34 and 35 in such a relationship, the deformation force due to the contraction of these

elastic members

34 and 35 is effectively propagated to the side absorber 23d, and the side absorber 23c. This is preferable because the substantially L-shaped bending deformation is further promoted.

In the diaper 10, in the surface sheet 21 constituting the absorbent main body 20, a region in the width direction Y extending from a part of one side absorbent body 23d to a part of the other side absorbent body 23d has an uneven surface facing the skin. It preferably has a structure. This is because the uneven structure makes it difficult for the side absorbent body 23d to unintentionally fall toward the central absorbent body. It is preferable that the uneven structure portion of the surface sheet 21 covers the entire area of the central absorbent body 23c and the opening 231a in the width direction Y, and covers the position near the opening 231a of the side absorbent body 23d. From the viewpoint of more effectively preventing the side absorber 23d from falling down, it is advantageous that the uneven structure of the topsheet 21 is a thick and bulky structure. Such a concavo-convex surface sheet is described in, for example, Japanese Patent Application Laid-Open No. 2004-174234. The surface sheet described in the publication has an upper layer that is directed to the skin side of the wearer and is made of a sheet-like material, and a lower layer that is arranged on the absorber side and is made of a sheet-like material. The lower layer is partly joined to form a large number of joints, and the upper layer protrudes toward the wearer's skin side at portions other than the joints, and the interior is hollow. The convex part is formed.

From the viewpoint of ensuring a sufficient space defined by the side absorbent body 23d and the central absorbent body 23c after bending, it is preferable that the side absorbent body 23d has a lower basis weight than the central absorbent body 23c. It is. In this case, the basis weight of the side absorbent 23d (g / ^{m 2),} the basis weight of the central absorbent body 23c against (g / ^{m 2),} preferably 20% or more, particularly 35% or more, 80 % Or less, and particularly preferably 65% or less. For example the basis weight of the side absorbent 23d (g / ^{m 2)} is basis weight of the central absorbent body 23c against ^{(g / m 2), 80} % 20% or more or less, 65% or less, especially 35% or more Is preferred. In the present embodiment, the central absorbent body 23c is composed of a laminated structure of a lower layer absorbent body 23a and an upper absorbent body 23b. The basis weight of the central absorbent body 23c is the lower layer absorbent corresponding to the central absorbent body 23c. It is the total basis weight of the body 23a and the upper layer absorbent body 23b.

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

7 to 9 show another embodiment of the diaper of the present invention. For points that are not particularly described with respect to these embodiments, the description in detail regarding the embodiments shown in FIGS. 1 to 6 is applied as appropriate. 7 to 9, the same members as those in FIGS. 1 to 6 are denoted by the same reference numerals. In the diaper 10 of the embodiment shown in FIGS. 7 to 9, the member to be joined to the extending portion 21 E of the topsheet 21 is different from the embodiment shown in FIGS. 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 21 E of the topsheet 21 is located on the exterior body 30 side of the extended portion 21 E and is a member adjacent to the extended portion 21 E. 22 is joined. Both are joined by the adhesive 40a, and the junction part 43 is formed by it. In the present embodiment, the fixing portions of the leak-proof cuff 40 are located on both sides of the backsheet 22.

8, the back sheet 22 is disposed between the inner layer sheet 31 and the outer layer sheet 32 in the outer package 30. Among these sheets, the sheet facing the absorber 25 is the inner layer sheet 31. Therefore, the extension part 21E of the topsheet 21 is joined to the inner layer sheet 31 which is a member located on the exterior body 30 side of the extension part 21E and adjacent to the extension part 21E. Both are joined by the adhesive 40a, and the junction part 43 is formed by it. In the present embodiment, the fixing portions of the leak-proof cuff 40 are located on both side portions of the inner layer sheet 31.

In the diaper 10 of the embodiment shown in FIG. 9, the outer package 30 has a single layer structure. The exterior body 30 also serves as a back sheet. Therefore, the extension part 21 E of the topsheet 21 is joined to the single-layer exterior body 30. Both are joined by the adhesive 40a, and the junction part 43 is formed by it. In the present embodiment, the fixing portions of the leak-proof cuff 40 are located on both sides of the exterior body 30.

In the embodiment shown in FIGS. 7 to 9, the same advantageous effects as those of the embodiment shown in FIGS.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the diaper according to each of the embodiments described above, the exterior body 30 including the

sheets

31 and 32 that are continuous over the entire length in the longitudinal direction from the abdominal side A to the back side B is disposed. As shown in FIG. 10, a split-type pants-type disposable diaper in which the exterior body 30 is divided into the abdominal sheet member 30 A and the back sheet member 30 B may be used.

This invention discloses the following underpants type disposable diaper regarding embodiment mentioned above further.
<1>
A pants-type disposable diaper comprising an absorbent core and an exterior body disposed outside the absorbent core,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies that are disposed on both sides of the central absorbent body and extend in the longitudinal direction, and the central absorbent body and the pair of side absorbent bodies Between each of them, there is a bending guide part consisting of an opening extending in the longitudinal direction,
The absorbent core has a skin-facing surface coated with a surface sheet, and the surface sheet has extending portions extending outward in the width direction from both side edges of the absorbent core. The part is folded back to the non-skin facing surface side of the absorbent core, covering the non-skin facing surface,
The extension part of the surface sheet is located on the exterior body side of the extension part and joined to a member adjacent to the extension part,
The joining position of the extension part and the member adjacent to the extension part is outside in the width direction from the bending guide part,
An underpants-type disposable diaper in which elastic members are arranged on both side edges of the absorbent core along the side edges so that the side absorbent body is bent between the elastic members and the joining position.

<2>
A joint region between the extension part and the member adjacent to the extension part, and a non-joint region between the extension part and the member are arranged in parallel on the non-skin facing side of the side absorbent body along the width direction. The pants-type disposable diaper according to <1>.
<3>
The exterior body has an abdominal side part arranged on the wearer's belly side when the diaper is worn, a back side part arranged on the wearer's back side, and a crotch part positioned therebetween,
The exterior body includes a leg elastic member in the crotch portion at a position outward in the width direction from a joint position between the extension part and the member adjacent to the extension part. Or the underpants type disposable diaper as described in <2>.
<4>
The pants-type disposable diaper according to <3>, wherein the leg elastic member is disposed along a leg opening edge in the crotch part of the exterior body.
<5>
The leg elastic member is separately disposed in each of the ventral side portion and the back side portion of the exterior body,
The position where the leg elastic member arranged on the ventral side intersects with the side edge of the absorbent core, and the position where the leg elastic member arranged on the back side intersects with the side edge of the absorbent core The pants-type disposable diaper according to the above <3> or <4>, wherein are different.
<6>
The width direction inner end portion in the stretchable region of the leg elastic member is arranged on the inner side than the width direction outer end portion of the joint portion between the extended portion of the topsheet and the member adjacent to the extended portion, The underpants-type disposable diaper according to any one of <3> to <5>, wherein a part of the stretchable region of the leg elastic member intersects with an outer end portion in the width direction of the joint portion.
<7>
The position where the leg elastic member arranged on the ventral side intersects with the side edge of the absorbent core, and the position where the leg elastic member arranged on the back side intersects with the side edge of the absorbent core The pants-type disposable diaper according to any one of <3> to <6>, wherein is biased toward the ventral side.

<8>
The position where the leg elastic member arranged on the ventral side and the leg elastic member arranged on the dorsal side intersect the ventral side relative to the position where the diaper is divided into two parts in the longitudinal direction. The pants-type disposable diaper according to the above <7>, which is biased toward the part side.
<9>
The exterior body has a waist elastic member extending in the width direction at a position on the ventral side portion or the back side portion at the outer side in the width direction than both side edges of the absorbent main body,
The underpants-type disposable according to any one of <3> to <8>, wherein a part of the waistline elastic member and a part of the leg elastic member are overlapped in a plan view in a developed state of the diaper. Diapers.
<10>
The skin facing surface and the non-skin facing surface of the absorbent core are covered with a covering sheet,
<1> thru | or <9> in which the said coating sheet of the skin opposing surface side and the said coating sheet of the non-skin opposing surface side are joined in the said bending | flexion induction | guidance | derivation part of the said absorptive core. Pants-type disposable diapers.
<11>
<1> thru | or <where the skin opposing surface has uneven structure in the area | region of the width direction ranging from a part of one said side absorber to a part of the said other side absorber among the said surface sheets. The pants-type disposable diaper according to any one of 10>.
<12>
The pants-type disposable diaper according to any one of <1> to <11>, wherein the side absorbent body of the absorbent core has a basis weight lower than that of the central absorbent body.
<13>
The pants-type disposable diaper according to any one of <1> to <12>, wherein the outer package has a non-stretchable region in a central region in the width direction of the outer package at the crotch part of the diaper.

<14>
The bending induction portion extends in the longitudinal direction of the absorbent core and does not extend to each edge in the longitudinal direction of the absorbent core, but only in a substantially central region in the longitudinal direction X of the absorbent core. The pants-type disposable diaper according to any one of <1> to <13>, which is formed.
<15>
The bending guide part is formed at a position symmetrical with respect to the longitudinal center line of the absorbent core,
The bending guide part has a substantially arcuate and elongated shape defined by a linear part and an arc part connected to each end of the linear part,
In the bending guide portion, the linear portion is positioned outward in the width direction of the absorber, and the arc portion is positioned inward in the width direction of the absorber. The underpants type disposable diaper according to any one of <14>.
<16>
The pants-type disposable diaper according to any one of the above items <1> to <15>, wherein a side edge of the extension part reaches the central absorbent body substantially beyond the bending guide part.
<17>
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
<1> thru | or <16> any one of said <1> thru | or <16> with which the sheet material which comprises the said leak-proof cuff is joined with the said extension part and the adhesive agent in the non-skin facing side of the said side absorber. Pants-type disposable diaper.
<18>
The joint between the sheet material and the extended portion by the adhesive on the non-skin facing side of the side absorbent body is not formed in the entire width direction of the side absorbent body, and is on the side of the bending induction part. The pants-type disposable diaper according to <17>, wherein the pants-type disposable diaper is formed in a biased region.

<19>
Adhesive is not applied to the outer region in the width direction than the joint region between the extension part and the member adjacent to the extension part, and the extension part and the extension part are adjacent to each other. The underpants-type disposable diaper according to any one of <1> to <18>, wherein the member is in a non-bonded state.
<20>
The pants type according to any one of <1> to <19>, wherein the side absorbent body is bent and deformed with respect to the central absorbent body and is bent so that the side absorbent body itself is substantially L-shaped. Disposable diapers.
<21>
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
The sheet material constituting the leak-proof cuff is joined to the extension part on the non-skin facing side of the side absorber,
<1> to <20> according to any one of <1> to <20>, wherein the fixed end of the leak-proof cuff is positioned outward in the width direction from the joint between the extension portion and the sheet material. Pants-type disposable diaper.
<22>
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
The pants-type disposable diaper according to any one of <1> to <21>, wherein an elastic member is disposed at a fixed end of the leak-proof cuff or in the vicinity thereof.

As described above in detail, according to the pants-type disposable diaper of the present invention, even if the wearer opens and closes the leg violently in the wearing state, a wide space for receiving excrement and preventing leakage thereof is stabilized. Can be maintained.

Claims

A pants-type disposable diaper comprising an absorbent core and an exterior body disposed outside the absorbent core,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies that are disposed on both sides of the central absorbent body and extend in the longitudinal direction, and the central absorbent body and the pair of side absorbent bodies Between each of them, there is a bending guide part consisting of an opening extending in the longitudinal direction,
The absorbent core has a skin-facing surface coated with a surface sheet, and the surface sheet has extending portions extending outward in the width direction from both side edges of the absorbent core. The part is folded back to the non-skin facing surface side of the absorbent core, covering the non-skin facing surface,
The extension part of the surface sheet is located on the exterior body side of the extension part and joined to a member adjacent to the extension part,
The joining position of the extension part and the member adjacent to the extension part is outside in the width direction from the bending guide part,
An underpants-type disposable diaper in which elastic members are arranged on both side edges of the absorbent core along the side edges so that the side absorbent body is bent between the elastic members and the joining position.
A joint region between the extension part and the member adjacent to the extension part, and a non-joint region between the extension part and the member are arranged in parallel on the non-skin facing side of the side absorbent body along the width direction. The underpants-type disposable diaper according to claim 1.
The exterior body has an abdominal side part arranged on the wearer's belly side when the diaper is worn, a back side part arranged on the wearer's back side, and a crotch part positioned therebetween,
The said exterior body has a leg elastic member in the width direction outward position in the said crotch part rather than the joining position of the said extension site | part and the said member adjacent to this extension site | part. The pants-type disposable diaper according to 2.
The pants-type disposable diaper according to claim 3, wherein the leg elastic member is disposed along a leg opening edge in the crotch part of the exterior body.
The leg elastic member is separately disposed in each of the ventral side portion and the back side portion of the exterior body,
The position where the leg elastic member arranged on the ventral side intersects with the side edge of the absorbent core, and the position where the leg elastic member arranged on the back side intersects with the side edge of the absorbent core The pants-type disposable diaper according to claim 3 or 4, wherein are different from each other.
The width direction inner end portion in the stretchable region of the leg elastic member is arranged on the inner side than the width direction outer end portion of the joint portion between the extended portion of the topsheet and the member adjacent to the extended portion, The pants-type disposable diaper according to any one of claims 3 to 5, wherein a part of the stretchable region of the leg elastic member intersects with the widthwise outer end of the joint.
The position where the leg elastic member arranged on the ventral side intersects with the side edge of the absorbent core, and the position where the leg elastic member arranged on the back side intersects with the side edge of the absorbent core The pants-type disposable diaper according to claim 3, wherein is biased toward the abdomen side.
The position where the leg elastic member arranged on the ventral side and the leg elastic member arranged on the dorsal side intersect the ventral side relative to the position where the diaper is divided into two parts in the longitudinal direction. The pants-type disposable diaper according to claim 7, wherein the pants-type disposable diaper is biased toward a portion side.
The exterior body has a waist elastic member extending in the width direction at a position on the ventral side portion or the back side portion at the outer side in the width direction than both side edges of the absorbent main body,
The pants-type disposable diaper according to any one of claims 3 to 8, wherein a part of the waistline elastic member and a part of the leg elastic member overlap each other in a plan view in a developed state of the diaper.
The skin facing surface and the non-skin facing surface of the absorbent core are covered with a covering sheet,
The pants according to any one of claims 1 to 9, wherein the covering sheet on the skin facing surface side and the covering sheet on the non-skin facing surface side are joined to each other in the bending guiding portion of the absorbent core. Type disposable diaper.
The skin facing surface has a concavo-convex structure in a region in a width direction extending from a part of one of the side absorbent bodies to a part of the other side absorbent body of the top sheet. The underpants type disposable diaper as described in any one of Claims.
The pants-type disposable diaper according to any one of claims 1 to 11, wherein the side absorbent body of the absorbent core has a basis weight lower than that of the central absorbent body.
The pants-type disposable diaper according to any one of claims 1 to 12, wherein the exterior body has a non-stretchable region in a central region in the width direction of the exterior body at a crotch part of the diaper.
The bending induction portion extends in the longitudinal direction of the absorbent core and does not extend to each edge in the longitudinal direction of the absorbent core, but only in a substantially central region in the longitudinal direction X of the absorbent core. The pants-type disposable diaper according to any one of claims 1 to 13, which is formed.
The bending guide part is formed at a position symmetrical with respect to the longitudinal center line of the absorbent core,
The bending guide part has a substantially arcuate and elongated shape defined by a linear part and an arc part connected to each end of the linear part,
In the bending induction part, the straight line part is located outward in the width direction of the absorber, and the arc part is located inward in the width direction of the absorber. The underpants type disposable diaper as described in any one of these.
The pants-type disposable diaper according to any one of claims 1 to 15, wherein a side edge of the extension part reaches the central absorbent body substantially beyond the bending guide part.
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
The pants type according to any one of claims 1 to 16, wherein the sheet material constituting the leak-proof cuff is joined to the extending portion by an adhesive on the non-skin facing side of the side absorbent body. Disposable diapers.
The joint between the sheet material and the extended portion by the adhesive on the non-skin facing side of the side absorbent body is not formed in the entire width direction of the side absorbent body, and is on the side of the bending induction part. The pants-type disposable diaper according to claim 17, which is formed in a biased region.
Adhesive is not applied to the outer region in the width direction than the joint region between the extension part and the member adjacent to the extension part, and the extension part and the extension part are adjacent to each other. The pants-type disposable diaper according to any one of claims 1 to 18, which is in a non-joined state with the member.
The pants-type disposable diaper according to any one of claims 1 to 19, wherein the side absorbent body is bent and deformed with respect to the central absorbent body and is bent so that the side absorbent body itself is substantially L-shaped. .
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
The sheet material constituting the leak-proof cuff is joined to the extension part on the non-skin facing side of the side absorber,
The pants-type mold according to any one of claims 1 to 20, wherein a fixed end of the leak-proof cuff is positioned outward in the width direction with respect to a joint portion between the extension portion and the sheet material. Disposable diapers.
Has a pair of leak-proof cuffs on both sides along the longitudinal direction,
The pants-type disposable diaper according to any one of claims 1 to 21, wherein an elastic member is disposed at a fixed end of the leak-proof cuff or in the vicinity thereof.