CN116747079A

CN116747079A - Pants-type absorbent article

Info

Publication number: CN116747079A
Application number: CN202310843240.7A
Authority: CN
Inventors: 有田光佑; 恩田蓝子; 藏前亮太
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2019-12-26
Filing date: 2020-12-23
Publication date: 2023-09-15
Also published as: JP7377705B2; CN114929173A; WO2021132293A1; JP2021104151A

Abstract

The application provides a pants-type absorbent article. The absorbent body (2) of the absorbent article (1) comprises an absorber (5) having an absorbent sheet (51), and the absorbent sheet (51) has particles of an absorbent polymer (513) disposed between 2 fibrous sheets (511, 512). The back side outer body (3B) has a back side extension portion (39) extending downward from the side seal portion (S). The back-side extension (39) has a back-side first expansion/contraction region (X1) that extends in the transverse direction (Y) and is expandable/contractible in the transverse direction (Y). When the absorbent article (1) is viewed from above, the back side first stretchable region (X1) does not overlap with the central region (5A) of the absorber (5) in the lateral direction (Y), and overlaps with the side regions (5B) adjacent to the central region.

Description

Pants-type absorbent article

The present application is a divisional application of patent application number CN202080089970.7, entitled "pants-type absorbent article" of which the original application date is 12/23 in 2020.

Technical Field

The present application relates to a pants-type absorbent article such as a pants-type disposable diaper.

Background

Pants-type disposable diapers are known which mainly comprise 3 panels, i.e., a stomach-side panel, a back-side panel, and a crotch panel. This type of diaper has the advantage that the legs of the wearer can easily move because the leg band in the crotch can be secured greatly, and the appearance in the worn state becomes tidy. However, on the other hand, buttocks are easily exposed, and coverage is not sufficient. Therefore, there has been proposed a method in which elastic members extending in the lateral direction are arranged and stretchable portions are provided on the back side sheet to improve the coverage of buttocks (see patent documents 1 and 2).

In addition to the above-mentioned techniques, there has been proposed a technique for improving the fit of a diaper by making the absorber thin. For example, patent document 3 describes that in a disposable diaper having an absorber formed of 2 layers of an upper layer absorber and a lower layer absorber, the upper layer absorber is composed of pulp and an absorbent polymer, and the lower layer absorber is composed of a structure in which the absorbent polymer is disposed between 2 sheets.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication 2016-202569

Patent document 2: US2018/271715A1

Patent document 3: japanese patent laid-open publication No. 2018-50987

Disclosure of Invention

The present invention relates to a pants-type absorbent article.

The absorbent article has a abdomen-side outer body disposed on the abdomen side of a wearer, a back-side outer body disposed on the back side of the wearer, and an absorbent body fixed to the outer bodies so as to span between the abdomen-side outer body and the back-side outer body.

The absorbent article has a longitudinal direction extending between the abdomen-side outer body and the back-side outer body and a transverse direction orthogonal to the longitudinal direction, and has side seals formed by joining both side edges of the abdomen-side outer body and the back-side outer body to each other.

The absorbent body includes an absorbent body having absorbent sheets with 2 fibrous sheets that are the same or different, and particles of absorbent polymer disposed between the fibrous sheets.

The back side outer body has a back side extension portion extending downward from the side seal portion.

The backside extension has a backside first telescoping region extending along the lateral direction and telescoping along the lateral direction.

The back side first stretchable region does not overlap the lateral center region of the absorber and overlaps a side region adjacent to the center region when the absorbent article is viewed from above.

Drawings

Fig. 1 is a diagram schematically showing a natural state of a pants-type disposable diaper as an embodiment of the pants-type absorbent article of the present invention.

Fig. 2 is a developed plan view schematically showing the skin-facing surface side of the diaper shown in fig. 1 in a developed and extended state.

Fig. 3 is an exploded perspective view schematically showing the skin-facing side of the diaper shown in fig. 1 in an unfolded and extended state.

Fig. 4 is a cross-sectional view schematically showing a cross-section along the longitudinal center line CLx of fig. 2 in the wearing state of the diaper shown in fig. 1.

Fig. 5 is a cross-sectional view schematically showing the section I-I of fig. 2 in the wearing state of the diaper shown in fig. 1.

Fig. 6 is a cross-sectional view schematically showing a cross-section along the thickness direction of one embodiment of an absorbent sheet that can be used as an absorbent body of the present invention.

Fig. 7 is a schematic perspective view of the absorbent sheet shown in fig. 6.

Fig. 8 is a schematic enlarged view illustrating another arrangement of the auxiliary layer.

Fig. 9 is a schematic diagram illustrating a structure of a modification of the auxiliary layer.

Fig. 10 is a schematic view illustrating the structure of an auxiliary layer having a low rigidity portion.

Fig. 11 is an exploded plan view schematically showing the structure of a pants-type absorbent article having a different back side outer cover.

Fig. 12 is an exploded plan view schematically showing the structure of a pants-type absorbent article having a different back side outer cover.

Fig. 13 is an exploded plan view schematically showing the structure of a pants-type absorbent article having a different structure of an absorbent main body.

Detailed Description

In the diapers described in patent documents 1 and 2, the absorber is disposed in the vicinity of the leg circumference in the wearing state, and the absorber is easily deformed by the action of the wearer. In particular, when the absorber at the position corresponding to the buttocks is deformed, the deformed absorber enters the buttocks, and there is a possibility that the wearing appearance is deteriorated, wearing discomfort, and leakage of liquid occur. When a thin absorber as described in patent document 3 is used, the absorber is deformed more seriously due to the lower rigidity of the absorber.

Accordingly, the present invention provides a pants-type absorbent article which can prevent deformation of an absorber to a good degree without impairing the fit of the absorber, and which can exhibit a good appearance in a worn state.

Hereinafter, the pants-type absorbent article of the present invention will be described with reference to the drawings based on preferred embodiments thereof. Fig. 1 to 4 show a pants-type diaper 1 which is one embodiment of the pants-type absorbent article of the present invention.

As shown in fig. 2, the diaper 1 has a longitudinal direction X corresponding to the front-rear direction of the wearer and a transverse direction Y orthogonal thereto. The diaper 1 has a crotch portion C and a front side portion a and a back side portion B extending in the longitudinal direction X from the front and rear of the crotch portion C. The diaper 1 extends in the longitudinal direction X from the abdominal side portion a to the back side portion B. In the present specification, the "front-rear direction of the wearer" refers to a direction extending between the abdomen side and the back side of the wearer via the crotch. The crotch portion C is a portion that is disposed in the crotch of the wearer in the worn state of the diaper 1. The abdomen-side portion a is a portion disposed on the front side, which is the abdomen side of the wearer, of the crotch portion C in the wearing state of the diaper 1. The back side portion B is a portion disposed on the back side of the wearer, that is, on the rear side of the crotch portion C in the worn state of the diaper 1.

The diaper 1 has a longitudinal center line CLx located at the center in the longitudinal direction X. The longitudinal centerline CLx is an imaginary straight line which bisects the diaper 1 in the developed and elongated state in the longitudinal direction X and extends in the lateral direction Y as shown in fig. 2. The term "developed and extended state" of the diaper 1 means that the diaper 1 is cut at a side seal portion described later to form a developed state, and the diaper 1 in the developed state is extended to a state in which the elastic members of each portion are extended to a designed size (the same size as when the elastic members are extended to a planar shape in a state in which the influence of the elastic members is completely removed).

The diaper 1 has an absorbent main body 2 and an outer body 3. As shown in fig. 3, the outer body 3 has outer sheets 31 and 32 and inner sheets 33 and 34 from the non-skin-facing surface side to the skin-facing surface side. The outer sheet 31 and the inner sheet 33 are joined to each other to form an abdomen-side outer case 3A disposed on the abdomen side of the wearer, and the outer sheet 32 and the inner sheet 34 are joined to each other to form a back-side outer case 3B disposed on the back side of the wearer.

The outer layers 31, 32 are stretchable. The outer sheets 31 and 32 form a non-skin-facing surface which is the outer surface of the diaper 1 at least on the abdomen side portion a and the back side portion B. The inner plies 33, 34 are non-stretch panels. The outer layer sheets 31 and 32 are joined to the inner layer sheets 33 and 34 in a state stretched in the transverse direction Y by a known joining method such as an adhesive.

The diaper 1 has a pair of side seals S, S formed by mutually joining the side portions AS, BS of the abdomen-side casing 3A and the back-side casing 3B to each other by a known joining method such AS an adhesive, heat sealing, and ultrasonic sealing. As shown in fig. 1, the diaper 1 is a pants-type absorbent article in which a waist opening WH through which the waist of the wearer passes and a pair of leg openings LH and LH through which the lower limbs of the wearer pass are formed by joining the abdomen-side outer body 3A and the back-side outer body 3B at the side seal portions S, S.

In the present specification, the "skin-facing surface" refers to a surface of the absorbent article, i.e., the diaper 1 or a component (e.g., the absorbent body) thereof, which faces the skin side of the wearer when the diaper 1 is worn, i.e., is relatively close to the skin side of the wearer, and the "non-skin-facing surface" refers to a surface of the diaper 1 or a component thereof, which faces the opposite side of the skin side, i.e., is relatively far from the skin side of the wearer when the diaper 1 is worn. The term "when worn" as used herein means that a state in which a normal proper wearing position, that is, a state in which a correct wearing position of the absorbent article is maintained, and that the absorbent article is not in a state shifted from the wearing position is not included.

In the diaper 1, the abdomen-side casing 3A and the back-side casing 3B are divided in the longitudinal direction X, and the absorbent main body 2 is fixed to the abdomen-side casing 3A and the back-side casing 3B so as to bridge between these casings.

As shown in fig. 2, the absorbent main body 2 has a rectangular shape in plan view, and is disposed in the center portion in the lateral direction Y of the abdomen-side outer cover 3A and the back-side outer cover 3B so that its longitudinal direction matches the longitudinal direction X of the diaper 1, and extends in the longitudinal direction X from the abdomen-side portion a to the back-side portion B. One end 2A of the absorbent body 2 is fixed to the inner layer sheet 33 by the body fixing portion 72, and one end 2B of the absorbent body 2 is fixed to the inner layer sheet 34 by the body fixing portion 73. The absorbent body 2 has an absorber 5. The absorber 5 includes a thin absorbent sheet 51 and an auxiliary layer 52 stacked on the absorbent sheet 51, and forms the thin absorber 5.

As shown in fig. 2, each of the abdomen-side casing 3A and the back-side casing 3B includes a plurality of linear or belt-shaped waist elastic members 41, 41 disposed in an elongated state between the outer layer sheet 31 and the inner layer sheet 33 and between the outer layer sheet 32 and the inner layer sheet 34. Specifically, in the regions of the respective side portions a and B, which are the open ends of the waist opening WH and the vicinity thereof, the respective elastic members 41 are arranged at intervals in the longitudinal direction X in the stretched state in the transverse direction Y. The waist elastic member 41 is disposed between the side seals S along the longitudinal direction X in each of the abdominal side portion a and the back side portion B, and is disposed in a region extending outward in the longitudinal direction X from the end edge of the absorbent main body 2. This region corresponds to the waist circumference of the wearer and its vicinity in the worn state. The waist elastic member 41 is disposed in a state of exhibiting elastic stretchability over substantially the entire length of the lateral direction Y of the outer body 3. As a result, as shown in fig. 1, a substantially continuous annular waist gather WG is formed over the entire circumference of the waist opening WH.

As shown in fig. 1, a waist fold BG is formed on the abdominal side portion a and the back side portion B. The waist gather of the abdomen side portion a includes an abdomen side outer body 3A and a plurality of elastic members 42 for forming the waist gather fixed to the abdomen side outer body 3A. The waist gather of the back side portion B includes a back side outer body 3B and a plurality of elastic members 42 for forming the waist gather fixed to the back side outer body 3B. The elastic member 42 is disposed in a region overlapping the absorbent body 5 in the lateral direction Y when the diaper 1 is viewed in the longitudinal direction X. The elastic members 42 extend in the lateral direction Y and are arranged on the abdomen-side casing 3A and the back-side casing 3B at intervals in the longitudinal direction X. The elastic member 42 is a plurality of linear or belt-like elastic members disposed in an elongated state between the outer layer sheets 31, 32 and the inner layer sheets 33, 34. The waist gathers BG are formed by fixing the elastic member 42 to the back outer case 3B in a state of being elongated in the lateral direction Y, and then releasing the elastic member 42 from the elongated state. When the diaper 1 is worn, the waist gather BG is formed in a region below the waist gather WG by contraction of the elastic member 42. Hereinafter, the stretch region in the abdomen-side portion a of the diaper 1 in which the waist gather BG is formed is also referred to as "first stretch region X2 on the abdomen-side.

The elastic member 42 disposed in the back side exterior body 3B in an elongated state in the range where the side seal S is formed is a back side second elastic member extending in the lateral direction Y. When the diaper 1 is seen in the longitudinal direction X, the elastic member 42 is disposed in a region where the back-side outer body 3B and the absorber 5 overlap in the lateral direction Y. The stretch region in the back side portion B of the diaper 1 in which the waist gather BG is formed is also referred to as a "back side second stretch region X3".

In the back-side second stretch region X3, the elastic member 42 located in a region from the lower end Sa of the side seal S in the longitudinal direction X to the upper end 5A of the absorber 5 is formed shorter than the other elastic members 42 so as not to be disposed in the central region 5A of the absorber 5 in the lateral direction Y in a region where the absorber 5 overlaps the back-side outer body 3B in the lateral direction Y. In the present embodiment, the elastic member 42 is not disposed in the central region 5A of the absorber 5, but when the elastic member 42 is also disposed in the central region 5A, it is preferable that the elastic member be disposed so as not to exhibit stretchability.

The inner end 42a, which is one end of the elastic member 42, is fixed by a backside second fixing portion 71 formed in a side region 5B adjacent to the central region 5A in the absorber 5.

As shown in fig. 2, the back outer body 3B has a back extension 39 extending from the lower end Sa of the side seal S toward the crotch C located at the longitudinal center line CLx as a lower side. The back extension 39 has a back expansion region X1 extending in the lateral direction and being expandable and contractible in the lateral direction Y. The back-side extension portion 39 is formed with curved portions 39a and 39b that curve so that the length of the lateral direction Y becomes shorter as going toward the lower crotch portion C. The bent portions 39a, 39b are formed from side edges 39c, 39d of the back-side extension portion 39 located in the lateral direction Y to terminal ends 39e, 39f located on the center side. The width W of the transverse direction Y from the terminal end 39e to the terminal end 39f is formed wider than the width W1 of the transverse direction Y of the absorbent main body 2, and the absorbent main body 2 is formed so as not to protrude from the back-side extension 39 to the transverse direction Y.

The back side stretchable region X1 has leg elastic members 43, 43 which become back side first elastic members extending in the lateral direction Y. At least a part of the leg elastic members 43, 43 is disposed in the back extension region X1 along the curved portions 39a, 39b of the back extension portion 39 so as to draw a curve along the leg circumference of the wearer. The back expansion/contraction region X1 is configured to be expandable and contractible by the leg elastic members 43, 43 being arranged in an expanded state. The leg elastic members 43, 43 are constituted by a plurality of linear or belt-like elastic members.

The outer ends 43a, 43a of the leg elastic members 43, 43 are positioned on the side edges 39c, 39d side of the back-side extension 39 and fixed. Inner ends 43b, which are one end of the leg elastic members 43, are disposed to be close to the terminals 39e, 39 f. These inner ends 43B, 43B are disposed so as to reach the side regions 5B adjacent to the central region 5A, without reaching the central region 5A of the absorbent body 2 (absorber 5). The inner ends 43B, 43B of the leg elastic members 43, 43 are fixed at least by the back side first fixing portions 70, 70 formed in the side regions 5B, 5B.

According to the diaper 1 of the present embodiment, the outer body divided into the abdomen-side outer body 3A and the back-side outer body 3B is constituted, and the absorbent main body 2 using the thin absorbent sheet 51 is disposed in the crotch portion C, so that the wearer can easily move the legs, and the fit is good. Further, since the back extension portion 39 having the back expansion region X1 which can expand and contract in the lateral direction Y is formed to extend downward from the lower end Sa of the side seal portion S in the back outer case 3B, the shape of the back outer case in the hip portion and the appearance in the wearing state are good like underpants.

Further, the back-side extension region X1 can be extended and contracted by the leg elastic members 43, and thus the stiff feel of the back-side extension portion 39 in the crotch portion C can be further reduced. Therefore, the comfort of the wearer is improved, and the appearance in the worn state becomes that of underpants, exhibiting an excellent appearance. Further, since the leg elastic members 43 are not disposed in the central region 5A of the absorbent body 5, the contraction effect on the central region 5A can be reduced, and therefore, deformation of the absorbent body 5 (absorbent sheet 51) in the central region 5A can be suppressed, which is preferable. In the following description, the back expansion region X1 is also referred to as "back first expansion region X1".

According to the diaper 1 of the present embodiment, the inner ends 43B, 43B of the leg elastic members 43, 43 are fixed by the back side first fixing portions 70, 70 formed in the side regions 5B, 5B of the absorbent body 5 adjacent to the central region 5A. Therefore, when the leg elastic members 43, 43 are stretched during wearing of the diaper 1, the tensile force of each elastic member 43 acts outward in the lateral direction Y with respect to the side region 5B of the absorbent body 5. Therefore, even in the case of the thin absorber 5, the occurrence of warp and wrinkles in the lateral direction Y can be effectively prevented.

In addition, since the inner end 42a of the elastic member 42 is fixed by the backside second fixing portion 71 formed in the side region 5B of the absorber 5 adjacent to the central region 5A, when the elastic member 42 is elongated at the time of wearing, a tensile force thereof acts on the side region 5B of the absorber 5. With such a structure, the absorber 5 can be more effectively prevented from being twisted or wrinkled in the lateral direction Y.

According to the diaper 1 of the present embodiment, the back side stretchable region X1 is stretchable by the leg elastic members 43, and at least a part of the stretchable region X is arranged so as to draw a curve along the circumference of the leg of the wearer. As a result, the stiffness of the back-side extension 39 in the crotch portion C can be reduced. The appearance of the diaper 1 in the worn state is also a pants-like appearance, and the diaper 1 exhibits a good appearance.

In the present embodiment, the leg elastic members 43, 43 are not disposed in the central region 5A of the absorber 5, but in the case where the leg elastic members 43, 43 are disposed in the central region 5A, it is preferable that they are disposed so as not to exhibit stretchability. In this case, it is advantageous in that the inner ends 43B, 43B are fixed by the back side first fixing portions 70, 70 formed in the side regions 5B, and the occurrence of twisting or wrinkles in the lateral direction Y can be effectively prevented even in the thin absorber 5.

As shown in fig. 2, the diaper 1 is configured such that the back side first extension/contraction region X1 formed by the leg elastic members 43, 43 does not overlap the central region 5A of the absorber 5 in the lateral direction Y in a plan view, and overlaps the side regions 5B, 5B adjacent to the central region 5A. The back side first fixing portion 70 serving as a fixing portion of the leg elastic member 43 and the back side second fixing portion 71 serving as a fixing portion of the elastic member 42 are arranged to be spaced apart from each other in the longitudinal direction X. By adopting such a structure, the total area of the back side first fixing portion 70 and the back side second fixing portion 71 is smaller than in the case of integrating both fixing portions. In general, the rigidity of the back side first fixing portion 70 and the back side second fixing portion 71 tends to be high due to the presence of the adhesive, and the rigidity can be reduced by narrowing the total area of both fixing portions, and thus the tensile force of the leg elastic members 43 can be effectively applied to the central region 5A of the absorber 5. As a result, the occurrence of twisting in the central region 5A can be effectively prevented, and the insertion of the absorber 5 into the intergluteal cleft due to the twisting, the deterioration of the wearing appearance of the diaper 1, the occurrence of wearing discomfort of the diaper 1, and the leakage of liquid can be effectively prevented.

As shown in fig. 2, 3 and 5, the back-side outer case 3B and the absorbent main body 2 are fixed by the main body fixing portion 73. The main body fixing portion 73 is disposed so as to overlap the back side first fixing portion 70 in a top plan view of the diaper 1. By overlapping the fixing portions with each other in this way, the tensile force of the leg elastic members 43, 43 is effectively transmitted to the side regions 5B of the absorber 5 via the 2 fixing portions. Thus, even in the case of the thin absorber 5, the occurrence of twisting or wrinkling in the lateral direction Y can be effectively prevented.

As shown in fig. 4 and 5, the absorbent main body 2 includes: a liquid-permeable front sheet 10 disposed relatively close to the skin of the wearer; a back sheet 11 disposed at a position relatively distant from the skin of the wearer and having liquid impermeability or water repellency (in short, leakage resistance); and an absorber 5 disposed between the front sheet 10 and the back sheet 11.

The absorber 5 includes an absorbent sheet 51, an auxiliary layer 52, and a core-in-sheet (not shown) covering the outer surfaces of the absorbent sheet 51 and the auxiliary layer 52. These members constituting the absorbent main body 2 are integrally formed with each other by a known joining method such as an adhesive. As these members constituting the absorbent main body 2, members that can be generally used in such an absorbent article can be used without particular limitation, on the premise of following the description of the members.

The front sheet 10 is wound around the non-skin-facing surface side of the absorbent body 5 while traversing the skin-facing surface side of the absorbent body 5 (a pair of first standing portions 50 and a non-standing portion 53 described later) in the lateral direction Y, and the extending portions 10E of the front sheet 10 from both side edges (a pair of first standing portions 50, first extension regions) along the longitudinal direction X of the absorbent body 5.

In the present embodiment, the pair of extending portions 10E and 10E of the front sheet 10 are fixed between the absorber 5 and a leak-proof cuff forming sheet 80 described later at the base end portion 81 of the leak-proof cuff 8 described later. The front sheet 10 does not cover the entire area of the non-skin-facing surface of the absorbent body 5, and the central portion (the portion between the pair of base end portions 81, 81) in the lateral direction Y of the non-skin-facing surface of the absorbent body 5 is not covered by the front sheet 10 (the extension portion 10E).

In the present embodiment, a pair of leakage preventing cuffs 8, 8 and a pair of main body first stretch regions 90, 90 extending in the longitudinal direction X are disposed on both sides of the absorbent main body 2 (absorbent body 5) along the longitudinal direction X, as shown in fig. 2. The pair of leakage preventing cuffs 8, 8 and the pair of main body first expansion regions 90, 90 are disposed so as not to overlap the central region 5A in the lateral direction but to overlap the side regions 5B adjacent to the central region 5A. The main body first expansion and contraction regions 90, 90 are arranged outside the pair of leakage preventing cuffs 8, 8 in the lateral direction Y.

More specifically, the main body first expansion and contraction regions 90, 90 have a plurality of leg hole elastic members 91 extending in the longitudinal direction X. The leg elastic member 91 is enclosed in the sheet 92 in an elongated state so as to extend in the longitudinal direction X through the crotch portion C. The sheet 92 is joined to the absorber 5 side via the joining member 86. The main body first expansion and contraction regions 90, 90 are expandable and contractible by the leg hole elastic members 91, 91 being disposed in an expanded state. The leg elastic members 91, 91 are constituted by a plurality of linear or belt-like elastic members.

In the present embodiment, leg gathers LG are also formed in the left and right parts of the leg circumference of the wearer, that is, in both side parts in the longitudinal direction X of the diaper 1, by contraction of the leg circumference elastic members 91, as shown in fig. 1. As shown in fig. 2, the plurality of leg hole elastic members 91 are arranged such that one end 91a side thereof is located in the back side first expansion/contraction region X1 and the other end 91b thereof is located in the abdomen side first expansion/contraction region X2. The leg elastic member 91 is formed to have a length along the entire length in the longitudinal direction X such that one end 91a is located in the back side first expansion region X1 and the other end 91b is located in the abdomen side first expansion region X2 in the extended state. That is, the leg elastic members 91 are arranged with the length at which the one ends 91a do not overlap the back side second expansion/contraction region (X3). As shown in fig. 2 and 5, the one end 91a is disposed so as to overlap the inner ends 43b, 43b of the leg elastic members 43, 43 in the back side first expansion/contraction region X1. In the present embodiment, the main body first expansion and contraction regions 90 and 90 do not overlap the back side second expansion and contraction region X3, and overlap the abdomen side first expansion and contraction region X2.

In the absorbent main body 2, the sheet 92 is fixed to the abdomen-side casing 3A and the back-side casing 3B by the main body fixing parts 72, 73, whereby the abdomen-side casing 3A and the back-side casing 3B are integrated.

As described above, in the diaper 1 of the present embodiment, the main body first stretchable region 90 and the back side first stretchable region X1 of the absorbent main body 2 overlap each other in the top plan view of the diaper 1. Specifically, the inner ends 43b, 43b of the leg elastic members 43, 43 are fixed so as to overlap with the one ends 91a, 91a of the leg elastic members 91, 91. Therefore, when the back first extension/contraction region X1 is extended and the leg elastic members 43, 43 are extended during wearing of the diaper 1, the leg elastic members 91, 91 are also extended outward in the longitudinal direction X in conjunction with the extension. As a result, since the tensile forces of the leg elastic members 43, 43 and the leg elastic members 91, 91 act on the outer sides of the back-side lateral direction Y and the outer sides of the longitudinal direction X in the side regions 5B, 5B of the absorbent body 5 where both overlap, the occurrence of twisting or creasing in both the longitudinal direction X and the lateral direction Y can be effectively prevented even in the thin absorbent body 5.

Further, since the main body first stretchable region 90 does not overlap with the back side second stretchable region X3 having the plurality of elastic members 42, the force applied in the longitudinal direction X can be appropriately suppressed on the back side of the thin absorbent sheet 51 in particular. As a result, the absorbent sheet 51 is less likely to be twisted or wrinkled in the vicinity of the buttocks, and good fit and wearing appearance can be obtained.

In the diaper of the present embodiment, the first stretchable region X2 on the abdomen side provided in the abdomen side casing 3A overlaps the first stretchable region 90 on the main body. Specifically, the elastic member 42 of the abdomen-side first expansion area X2 and the other ends 91b, 91b of the leg elastic members 91, 91 are fixed in a state of being overlapped with each other in the abdomen-side casing 3A. With this configuration, when the first abdomen-side stretchable region X2 is stretched and the plurality of elastic members 42 are stretched during wearing of the diaper 1, the leg elastic members 91, 91 are also stretched outward in the longitudinal direction X in conjunction with the stretching. As a result, tensile forces of the elastic members 42 and the leg elastic members 91, 91 act in the lateral direction Y and the longitudinal direction X on the side regions 5B, 5B of the absorbent body 5, which are regions where the elastic members overlap. As a result, even if the absorbent sheet 51 is thin, the occurrence of skew or wrinkles in both the longitudinal direction X and the lateral direction Y can be effectively prevented.

The leakage preventing cuff 8 has a base end portion 81 where the leakage preventing cuff forming sheet 80 is fixed to another member, and an upright portion 82 where the sheet 80 is upright toward the wearer. The base end portion 81 is a portion that becomes a raised base end when the raised portion 82 is raised toward the skin side of the wearer during wearing of the diaper 1. The leakage preventing cuff forming sheet 80 is fixed to other members, for example, the back sheet 11, by a known fixing method such as hot melt or the like with an adhesive agent. The free end portion of the rising portion 82 (the portion closest to the skin of the wearer when the rising portion 82 is rising) is provided with a leakage preventing cuff forming elastic member 83 extending in the longitudinal direction X. The elastic member 83 for forming the leakage preventing cuff is fixed in an elongated state between the two sheets 80, 80 for forming the leakage preventing cuff, by a fixing method such as an adhesive. The number of the elastic members 83 is not particularly limited, and may be 1 or more.

When the diaper 1 is worn, the rising portion 82 rises toward the skin of the wearer with the base end portion 81 as the rising base end by the contraction force of the leakage preventing cuff forming elastic member 83. In such a standing state of the leakage preventing cuff 8, the standing portion 82 blocks movement of body fluid such as urine excreted by the wearer to the outside in the lateral direction Y, and therefore, the standing portion is combined with the blocking effect of body fluid by the pair of opposite side portions 50, 50 on both sides of the lateral direction Y of the absorber 5 described later, and side leakage can be effectively suppressed.

In the raised state of the leakage preventing cuff 8, the contraction force of the leakage preventing cuff forming elastic member 83 causes the entire diaper 1 to bend and deform so that the central region 5A of the longitudinal direction X of the absorbent main body 2 protrudes toward the non-skin-facing surface side (back sheet 11 side), and therefore the diaper 1 easily conforms to the body shape of the wearer. Further, since the rising portion 82 extends outward in the longitudinal direction X beyond the back side end portion 52d of the auxiliary layer 52 on the back side, the rising portion 82 can be more reliably raised, which is preferable.

As shown in fig. 4, the absorber 5 has: a pair of rising portions 50, 50 located at both side portions 5B, 5B at least in the crotch portion C across the central region 5A of the lateral direction Y of the absorbent body 5, rising toward the skin side of the wearer when worn; and a non-rising portion 53 located in the central region 5A and sandwiched by the pair of opposite portions 50, 50.

Specifically, as shown in fig. 4 and 5, side elastic members 9 for raising the raising portions 50 are disposed at or near both side edges of the absorber 5 in the longitudinal direction X (specifically, for example, in a region within 15mm from the side edges of the absorber 5 in the longitudinal direction X). The side elastic member 9 is disposed between the front sheet 10 and the absorbent sheet 51. That is, the absorbent body 2 is formed with a pair of rising portions 50, 50 extending in the longitudinal direction X on both sides of the absorber 5. The rising portions 50, 50 extend outward in the longitudinal direction X beyond the rear end portion 52d of the auxiliary layer 52. The side elastic members 9 are disposed between the absorbent sheet 51 and the front sheet 10 in a state of extending in the longitudinal direction X, and are fixed to at least the absorbent sheet 51 and further to the front sheet 10 by a known fixing method such as an adhesive. The side elastic members 9 may be arranged at least in the crotch portion C, and may be 1 or more as shown in the figure.

The rising portions 50 and 82 do not necessarily have to extend beyond the rear end portion 52d of the auxiliary layer 52, and the rising portions 550 and 82 can be sufficiently raised as long as they extend at least to the vicinity of the rear end portion 52 d. The vicinity here means that the end edge position of the rising portion 50 (end edge position of the side elastic member 9) and the end edge position of the rising portion 82 (end edge position of the elastic member 83) in the longitudinal direction X are within a permissible range in terms of design in the longitudinal direction X, with reference to the back side end portion 52d being coincident with the longitudinal direction X. For example, the vicinity is within a range of ±35mm with respect to the rising portion 50 and within a range of ±10mm with respect to the rising portion 82 when the rear end portion 52d is set as a reference position in the longitudinal direction.

In the present embodiment, the side elastic members 9 are fixed in an elongated state to both side portions of the absorbent body 5 in the lateral direction Y, and therefore, when the diaper 1 is worn, both side portions of the absorbent body 5 in the lateral direction Y stand up as a pair of standing portions 50, 50 toward the skin side of the wearer by contraction of the side elastic members 9. At this time, the absorber 5 has a tray shape having a non-standing portion 53 as a bottom portion and a pair of opposite portions 50, 50 extending obliquely from the bottom portion toward the skin side of the wearer as side portions in a cross-sectional view along the lateral direction Y.

As described above, in the present embodiment, the elastic member, the elastic region having an elastic function, and the side regions 5B, 5B of the thin absorber 5 of the diaper 1 are connected via the fixing portions. Therefore, when the elastic members and the elastic regions are elastically deformed during wearing of the diaper 1, the deformation is transmitted to the side regions 5B and 5B of the absorbent body 5. As a result, a tensile force in the stretching direction (for example, outward in the transverse direction Y) acts on the side regions 5B, 5B of the absorber 5, and therefore the absorber 5 extends in the stretching direction. With this structure, the absorber 5 can be effectively prevented from being twisted or wrinkled during wearing.

As the material of the various elastic members in the diaper 1 represented by the side elastic members 9, various known elastic materials commonly used in such an absorbent article can be used without particular limitation unless otherwise specified, and examples thereof include synthetic rubbers such as styrene-butadiene, isoprene, and chloroprene rubber, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member, a linear form (wire rubber, etc.) or a rope form (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, etc., or a multifilament linear form, etc. can be preferably used.

In the present embodiment, an example in which the auxiliary layer 52 is provided as the structure of the absorber 5 is described. The absorbent body 5 is rectangular in plan view, and is disposed in the center of the absorbent sheet 51 in the lateral direction Y so that the long side thereof extends along the longitudinal direction X, thereby being disposed in the central region 5A of the absorbent body 5. The auxiliary layer 52 is disposed in a region where the back side stretchable region X1 and the absorber 5 overlap in the lateral direction Y when the diaper 1 is viewed in the longitudinal direction X. That is, in the absorbent body 5, the central region 5A has a multilayer structure in which the absorbent sheet 51 and the auxiliary layer 52 are laminated, and the side regions 5B and 5B adjacent to the central region 5A have a single-layer structure in which the absorbent sheet 51 is independent. The auxiliary layer 52 is formed to have the same thickness and the same density (grammage) in the longitudinal direction X and the transverse direction Y. Therefore, the rigidity of the central region 5A of the absorber 5 is higher than that of the side regions 5B, 5B.

When the auxiliary layer 52 is disposed in the central region 5A (non-rising portion 53) in the lateral direction Y, the bending start points at which the pair of rising portions 50 perform the rising operation can be formed by the corner portions 52a1, 52b1 located at the end portions 52a, 52b of the auxiliary layer 52 in the lateral direction Y. Therefore, when wearing, the pair of rising portions 50 are lifted up in the crotch portion C, and the rising operation can be performed more reliably, so that the fit is improved. Further, when the pair of rising portions 50 extend beyond the back end portion 52d of the auxiliary layer 52 on the back side outer body 3B side, the rising operation in which the rising portions 50 are raised in the crotch portion C can be performed more reliably, and hence the fit is improved.

According to the diaper 1 of the present embodiment, since the length of the back-side extension 39 in the lateral direction Y becomes shorter as going downward, the stiff feel of the back-side extension 39 in the crotch portion C can be reduced. As a result, the comfort of the wearer is improved, the fit is improved, and the appearance in the worn state is changed to the appearance of underpants, and a good appearance is exhibited.

The auxiliary layer 52 is preferably a layer composed of a hybrid fiber body containing at least water-absorbent natural fibers and an absorbent polymer. The hybrid fiber product may be formed of, for example, only the water-absorbent natural fibers and the absorbent polymer, or may be formed by adding other materials, for example, including synthetic fibers, to the water-absorbent natural fibers and the absorbent polymer. By adopting this structure, the absorber 5 and the absorbent sheet 51 can be mutually engaged, and high liquid absorption can be obtained.

Next, the length of the auxiliary layer 52 in the longitudinal direction X will be described. As shown in fig. 8, the length L of the auxiliary layer 52 from the back-side end 52d to the abdomen-side end 52c on the opposite side thereof is formed longer than the length L1 from the end 52a to the end 52b in the lateral direction Y. In the present embodiment, the back end portion 52d is disposed on the absorbent sheet 51 so as to be located substantially at the center of the back extension region X1 of the back extension portion 39 in the longitudinal direction X, and the abdomen end portion 52c is located near the longitudinal center line CLx. If the auxiliary layer 52 is disposed on the backrest side outer body 3B in this manner, the rigidity of the absorber 5, particularly in the vicinity of the buttocks or the intergluteal cleft of the wearer, can be improved. This effectively prevents the occurrence of twisting or wrinkling at these locations.

As another arrangement of the auxiliary layer 52, for example, as shown in fig. 8, the lower end Sa of the side seal S, which is the start position of the back expansion/contraction region X1, may be arranged so as to match (e.g., align) with the position of the back end 52d, from the viewpoint of further improving the rigidity on the hip side. In this case, the length L (total length) of the auxiliary layer 52 is preferably at least the length of the back expansion region X1 or more.

Next, a modification of the auxiliary layer will be described with reference to fig. 9. The auxiliary layer 152 shown in the figure is disposed in the central region 5A in the transverse direction Y of the absorbent sheet 51. The auxiliary layer 152 is formed in a substantially rectangular shape extending from the back side outer body 3B to the abdomen side outer body 3A, and a widened portion 153 is formed on the abdomen side end 152c side. The auxiliary layer 152 is fixed to the absorbent sheet 51 so that the back end 152d located on the back side of the auxiliary layer 152 overlaps the back side stretch region X1 of the back side outer body 3B and the widened portion 153 overlaps the abdominal stretch region X2 of the abdominal side outer body 3A in plan view. The end surfaces 152a and 152b of the auxiliary layer 152 other than the widened portion 153 extend in the longitudinal direction X in a plan view, and the width of each end surface 152a and 152b substantially coincides with the width L1 of the back-side end portion 152 d.

The widened portion 153 is a portion whose length in the lateral direction Y increases as going from the back-side outer body 3B to the abdomen-side outer body 3A, and its width L2 is formed longer than the width L1 of the back-side end 152 d. The widened portion 153 is formed as inclined surfaces on the end surfaces 153a and 153b located in the lateral direction Y so that the length of the lateral direction Y continuously increases in order to fit the outer shape of the leg when worn. The inclined portion is disposed so as to overlap with the lower end edge 3Aa of the abdomen-side outer body 3A in a plan view. The widened portion 153 may be formed to be stepwise increased instead of continuously increasing the length of the lateral direction Y. In the present embodiment, the lower edge 3Aa of the abdomen-side outer body 3A is disposed so as to overlap the widened portion 153.

The auxiliary layer 152 preferably has a length extending from the back-side outer body 3B to the abdomen-side outer body 3A, and thus can increase the rigidity of the absorber 5 in the entire region in the longitudinal direction X of the crotch portion C. Further, since the widened portion 153 formed so that the length of the lateral direction Y continuously increases is disposed on the abdomen-side outer cover 3A side, the liquid absorption capacity of the abdomen-side absorbent body 5 can be ensured, which is preferable.

Since the end surfaces 153A, 153b inclined so as to overlap the lower end edge 3Aa of the abdomen-side outer body 3A are located at the widened portion 153, the widened portion 153 deforms along the leg circumference when the diaper is worn. Thus, fit when worn is improved, and the wearer can easily move the legs. Further, the auxiliary layer 152 is preferably overlapped with the back side stretch region X1 of the back side outer body 3B in a plan view and the widened portion 153 is overlapped with the waist stretch region X2 of the abdomen side outer body 3A, so that the fit in wearing is further improved.

In the above-described embodiment, the auxiliary layer 52 is formed to have the same density (grammage) in the longitudinal direction X and the transverse direction Y with the same thickness, but may have a structure having a low rigidity portion 521 that extends in the longitudinal direction X and has a lower rigidity than other portions in the auxiliary layer 52, as shown in fig. 10. The low rigidity portion 521 is a groove-like recess recessed from the auxiliary layer 52 toward the absorbent sheet 51, and is a plurality of low rigidity portions formed in an aligned manner in the lateral direction Y extending in the longitudinal direction X in the central region of the absorber 5. The low rigidity portion 521 is not limited to a plurality of portions, and may be a single low rigidity portion formed of 1 low rigidity portion 521, for example.

In the absorber 5, a portion overlapping with the groove-shaped concave portion in a plan view has a lower grammage than the surrounding area, that is, a material formed with a smaller mass per unit area (grammage) than the surrounding area, and becomes a low rigidity portion 521.

One end 521a of the low rigidity portion 521 located on the abdomen-side outer body 3A side extends beyond the lower end edge 3Aa of the abdomen-side outer body 3A until reaching a position overlapping the waistline fold BG. The other end 521B of the low rigidity portion 521 located on the back side exterior body 3B side does not reach the back side exterior body 3B.

In this way, when the auxiliary layer 52 is locally formed with the low rigidity portions 521, the rigidity of the auxiliary layer 52 and, therefore, the rigidity of the absorber 5 can be easily adjusted by adjusting the number of the low rigidity portions 521, the length in the longitudinal direction X, or the length in the lateral direction Y (width). In addition, when the low rigidity portion 521 is formed as a groove-like concave portion, it is more preferable because it is positioned on the side that contacts the skin of the wearer when worn, and therefore, it can function as a liquid guide passage.

In the above-described embodiment, the configuration in which the leg elastic members 43, 43 are arranged in the back expansion region X1 of the back outer body 3B has been described, but the configuration other than the leg elastic members 43, 43 described in the above-described embodiment can be applied to the diaper 1 having other back outer bodies.

For example, in the diaper 1A shown in fig. 11, the structure of the back side outer case is different from the above-described embodiment. Specifically, the structure of the back side outer case of the diaper 1A shown in fig. 11 is different from that of the previous embodiment in that the elastic member is provided in the back side stretch region X1 of the back side extension portion 39. The elastic member 47 is an elastic member linearly arranged in an extended state along the lateral direction Y so that the back-side casing can expand and contract in the lateral direction Y.

The elastic member 47 is a plurality of linear or belt-like elastic members disposed in an elongated state between the outer sheet 32 and the inner sheet 34, similarly to the elastic member 41. The elastic members 47 extend in the lateral direction Y, and are disposed on the back-side outer case 3B at intervals in the longitudinal direction X. Therefore, the back side outer case can form wrinkles similar to the waist wrinkles BG generated by the elastic members 41 in the back side extension 39. The elastic member 47 is not disposed in the central region of the absorber 5, but is cut in the lateral direction Y with the absorber 5 as a boundary. The diaper 1A having such a structure can provide the same operational effects as those of the diaper 1 according to the embodiment described above.

Next, a preferred embodiment of the absorbent sheet 51 will be described with reference to fig. 6 and 7. The absorbent sheet 51 is a thin absorbent sheet having a first fibrous sheet 511, a second fibrous sheet 512, and a plurality of particles of absorbent polymer 513 disposed between the two sheets 511, 512. The two sheets 511, 512 are joined to each other by an adhesive 514. In the illustrated embodiment, the adhesive 514 is disposed on the inner surface (the surface opposite to the absorbent polymer 513) of each of the two sheets 511 and 512. The plurality of particles of the absorbent polymer 513 are arranged with a constant uniformity in the surface direction of the absorbent sheet 51, and form an arrangement region of the absorbent polymer 513.

In the arrangement region of the absorbent polymer 513 in the absorbent sheet 51, the absorbent polymer 513 is arranged such that a macroscopically visible gap is not visible. The "gap that is not visually observable" herein means that the absorbent polymers 513 are disposed so as to cover the entire surface (without omission) of one surface of the fiber sheet, but when the region is visually observed at a microscopic level, the gaps between the absorbent polymers 513 are allowed to be formed unintentionally. The voids are approximately 10 to 1000 μm. In the following description, the microscopic voids between the absorbent polymers 513 observed in the arrangement region of the absorbent polymers 513 are also referred to as "microscopic voids".

In the placement region of the absorbent polymer 513, there is a portion (hereinafter, also simply referred to as "direct bonding portion") 515 where the first fiber sheet 511 and the second fiber sheet 512 are directly bonded to each other with the adhesive 514 not interposed between the absorbent polymers 513. The direct bonding sites 515 are formed in the microscopic voids, respectively. In the direct bonding portion 515, the adhesive 514 is columnar when viewed in cross section in the sheet thickness direction, and directly bonds the two sheets 511 and 512 to each other. When the absorbent sheet 51 is viewed in the sheet plane direction, a plurality of direct bonding sites 515 are formed in a regular or irregular scattered pattern. By forming the direct bonding sites 515, the absorbent polymer 513 can be held at a predetermined position of the absorbent sheet 51, and the liquid absorbency of the absorbent polymer 513 can be fully exerted. The direct bond 515 can be formed by appropriately adjusting the gram weight or particle diameter of the absorbent polymer 513 or the application amount and area of the adhesive 514, for example.

As shown in fig. 6 and 7, the absorbent sheet 51 preferably has not only a direct bonding portion 515 but also a portion (hereinafter also referred to as "indirect bonding portion") 516 where the two sheets 511, 512 are bonded by an adhesive 514 via an absorbent polymer 513. At the indirect joining portion 516, the application portion of the adhesive 514 in the first fibrous sheet 511, the site where the absorbent polymer 513 exists, and the application portion of the adhesive 514 in the second fibrous sheet 512 overlap in the thickness direction. By forming such a structure, the absorbent polymer 513 can be held at a predetermined position of the absorbent sheet 51, and unexpected movement or bias of the absorbent polymer 513 can be further reduced, and the liquid absorbency of the absorbent sheet 51 can be further improved.

As the adhesive 514, an adhesive having flexibility that can be elongated according to swelling change of the absorbent polymer 513 accompanying liquid absorption can be preferably used. Examples of such a raw material include one or more acrylic adhesives such as (co) polymers (ethylene-vinyl acetate copolymer, etc.) containing vinyl monomers represented by ethylhexyl 2-acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, etc., silicone adhesives such as polydimethylsiloxane polymers, etc., natural rubber adhesives such as natural rubber, one or more isoprene adhesives such as polyisoprene, chloroprene, etc., and rubber adhesives such as one or more styrene adhesives including styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), etc. 1 kind of them may be used alone or 2 or more kinds may be used in combination. As shown in fig. 6, when the adhesive 514 is disposed on the surface (inner surface) of each of the sheets 511 and 512 facing the absorbent polymer 513, the adhesive 514 disposed on the first fiber sheet 511 and the adhesive 514 disposed on the second fiber sheet 512 may be the same type or different types.

Among them, from the viewpoint of excellent flexibility and stretchability, the two sheets 511 and 512 are kept in a state of direct bonding even after swelling of the absorbent polymer 513, and contraction force is exerted, and the absorbent polymer 513 is easily held between the two sheets 511 and 512, it is preferable to use a rubber-based adhesive as the adhesive 514, and it is more preferable to use a styrene-based adhesive as the rubber-based adhesive.

The adhesive 514 is preferably a hot melt adhesive from the viewpoint of both the flexibility of the adhesive and the adhesion to the sheet. As the hot melt adhesive, for example, a tackifier such as petroleum resin or polyterpene resin, a plasticizer such as paraffin wax, and an oxidation inhibitor such as phenols, amines, phosphorus, benzimidazole, if necessary, can be contained in the above-mentioned various adhesives.

According to the absorbent sheet 51 having the above-described structure, the adhesive 514 present at the direct bonding portion 515 can provide a proper bonding force between the fibrous sheets 511 and 512 to such an extent that the absorbent polymer 513 does not move or fall off, and the absorbent polymer 513 can be carried at a proper position between the fibrous sheets 511 and 512. Further, since a moderate bonding force is exhibited to such an extent that the absorbent polymer 513 can sufficiently swell, the liquid absorbency of the absorbent polymer 513 can be sufficiently exhibited. According to the preferred embodiment of the present invention, since the adhesive 514 has stretchability, the balance between the elongation of the adhesive 514 existing at the direct bonding portion 515 and the contraction force of the adhesive 514 due to the swelling of the absorbent polymer 513 is easily generated, and the bonding force that can satisfy both the holding of the absorbent polymer 513 at the appropriate position and the securing of the space in which the absorbent polymer 513 can swell can be efficiently exhibited. As a result, the liquid absorbency of the absorbent sheet 51 is further improved.

The adhesive 514 is preferably applied to the inner surface of each of the two sheets 511, 512, i.e., the surface opposite the absorbent polymer 513. By adopting such a configuration, the adhesive 514 applied to the two sheets 511 and 512 can be bonded to each other, the direct bonding portion 515 can be efficiently formed in the absorbent sheet 51, and both the supporting of the absorbent polymer 513 in place and the securing of the space in which the absorbent polymer 513 can swell can be achieved. In addition, since the adhesive 514 can easily exist in the gaps between the fibers constituting the two sheets 511 and 512, there is also an advantage that peeling is not easily generated at the interfaces between the two sheets 511 and 512 and the adhesive 514.

From the viewpoint of suppressing unexpected movement or falling of the absorbent polymer 513 and further improving the absorption rate of the liquid, it is preferable that the adhesive 514 is discontinuously applied in such a manner as to have a non-application portion in the joining region with the second fiber sheet 512 in the first fiber sheet 511, and the adhesive 514 is continuously applied without a gap in the entire region of the joining region with the first fiber sheet 511 in the second fiber sheet 512, as shown in fig. 6 and 7. In addition, the non-existing surface of the adhesive 514 in the first fibrous sheet 511, that is, the outer surface of the absorbent sheet 51 on the first fibrous sheet 511 side is preferably used as the liquid receiving surface, that is, the surface where the absorbent sheet 51 is first contacted with the liquid. The bonding region is a region where the absorbent polymer 513 is disposed such that a macroscopically visible gap is not visible.

The first fiber sheet 511 may be formed by discontinuously applying the adhesive 514 so as to have a non-application portion, for example, in a spiral shape, a peak shape, an omega shape, a curtain shape, or a stripe shape. In the present embodiment, the adhesive 514 applied to the first fiber sheet 511 is in a spiral shape.

The thickness of the absorbent sheet 51 is, for example, 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness measured under the pressure of (2) is preferably 0.3mm or more, more preferably 0.6mm or more, and preferably 5mm or less, more preferably 2mm or less.

The proportion of the particles of the absorbent polymer 513 in the absorbent sheet 51 (hereinafter also referred to as "SAP proportion") is, for example, preferably 60 mass% or more, more preferably 70 mass% or more, and preferably 95 mass% or less, more preferably 90 mass% or less.

When such an absorbent sheet 51 is used, the absorbent performance can be maintained and formed thin.

The SAP ratio is measured, for example, by the following method.

(1) The absorbent sheet 51 is attached to the diaper 1 in a predetermined area (for example, 9cm ² ～100cm ² ) And (5) taking out. In this case, note that the absorbent sheet 51 is cut only at a portion where a macroscopic gap between the absorbent polymers 513 cannot be observed.

(2) The absorbent sheet 51 is decomposed using a solvent that dissolves the adhesive, and the 2 fibrous sheets 511, 512 and the absorbent polymer 513 are separated.

(3) The mass of the fibrous sheets 511, 512 and the mass of the absorbent polymer 513 were measured.

(4) The SAP ratio was calculated according to the following equation.

SAP ratio= ((mass of absorbent polymer 513)/(mass of absorbent polymer 513+mass of each fiber sheet 511, 512)) ×100

The thickness of the absorbent sheet 51 was measured using a KES-G5 hand-held compression tester manufactured by KATO TECH Co. Specifically, the absorbent sheet 51 was mounted on a test stand of a measuring apparatus, and the test stand had an area of 2cm ² To apply 4.9mN/cm to the absorbent sheet 51 by compressing the sample between the circular planar veneers ² (＝0.5gf/cm ² ) Is a load of (a). The thickness of the absorbent sheet 51 is measured in this state. The compression speed was set to 0.5mm/sec, and the compression maximum load was set to 490mN/cm ² (＝50gf/cm ² )。

The absorbent sheet may be configured other than the configuration described as the absorbent sheet 51. For example, a sheet in which water-absorbent fibers are mixed and which is sandwiched between sheets by press embossing without using an adhesive can be exemplified.

The present invention has been described above based on preferred embodiments thereof, but the present invention is not limited to the specific embodiments, and various modifications and alterations are possible within the scope of the gist of the present invention unless otherwise specified in the above description.

For example, as shown in fig. 12, the backside extension 39 may be rectangular in a top view.

As shown in fig. 13, the absorber 5 may have an absorbent sheet 51 without the auxiliary layer 52.

The auxiliary layer 52 may be disposed over the entire region where the back stretchable region X1 and the absorber 5 overlap in the lateral direction Y when the diaper 1 is viewed in the longitudinal direction X.

With respect to the above-described embodiments, the present invention further discloses the following pants-type absorbent article.

<1>

A pants-type absorbent article comprising a belly-side outer body disposed on the belly side of a wearer, a back-side outer body disposed on the back side of the wearer, and an absorbent main body fixed to the outer bodies so as to be stretched between the belly-side outer body and the back-side outer body, and comprising a longitudinal direction extending between the belly-side outer body and the back-side outer body and a transverse direction orthogonal to the longitudinal direction, and comprising side seal portions formed by joining both side portions of the belly-side outer body and the back-side outer body to each other,

the absorbent body includes an absorbent body having absorbent sheets having 2 fibrous sheets that are the same or different, and particles of an absorbent polymer disposed between the fibrous sheets,

The back side outer body has a back side extension portion extending downward from the side seal portion,

the backside extension has a backside first telescoping region extending along the lateral direction and telescoping along the lateral direction,

<2> the pants-type absorbent article according to <1>, wherein,

the back side first stretchable region is stretchable by being provided with a back side first elastic member extending in the lateral direction,

one end portion of the back side first elastic member is fixed with at least a back side first fixing portion formed in the side region adjacent to the central region in the absorber,

in the region where the side seal is formed, the back side outer body has a back side second stretch region formed by disposing a back side second elastic member extending in the lateral direction in a region where the back side outer body and the absorbent body overlap in the lateral direction when the absorbent article is viewed in the longitudinal direction,

the backside second elastic member is not arranged in the lateral center region in the absorber, or is arranged so as not to exhibit stretchability in the case of being arranged in the center region,

One end portion of the backside second elastic member is fixed with at least a backside second fixing portion formed in the absorber in the side region adjacent to the central region.

<3> the pants-type absorbent article according to <2>, wherein,

the back side first securing portion is spaced apart from the back side second securing portion in the longitudinal direction.

<4> the pants-type absorbent article according to <3>, wherein,

at least a portion of the back side first elastic member is disposed in a manner that describes a curve along the circumference of the leg of the wearer.

<5> the pant-type absorbent article according to any of the above <2> to <4>, wherein,

the back side outer body and the absorbent main body are fixed by a main body fixing part,

the main body fixing portion overlaps the back side first fixing portion when the absorbent article is viewed in plan.

<6> the pant-type absorbent article according to any of the above <1> to <5>, wherein,

on both sides of the absorbent body there are main body first telescopic areas extending in the longitudinal direction,

the main body first stretchable region overlaps the back side first stretchable region when the absorbent article is viewed in plan.

<7> the pant-type absorbent article according to any of the above <2> to <5>, wherein,

The absorbent body has body first stretch regions extending in the longitudinal direction on both sides of the absorbent body,

the main body first telescoping region does not overlap the backside second telescoping region.

<8> the pants-type absorbent article according to <7>, wherein,

the abdomen-side outer body has an abdomen-side first stretchable region having stretchability in the lateral direction,

the main body first telescoping region overlaps the ventral first telescoping region.

<9> the pant-type absorbent article according to any of the above <1> to <8>, wherein,

the absorbent body has an auxiliary layer superposed on the absorbent sheet,

the auxiliary layer is composed of a hybrid fiber body containing at least water-absorbent natural fibers and an absorbent polymer.

<10> the pants-type absorbent article according to <9>, wherein,

a pair of leakage-proof flanges extending in the longitudinal direction are provided on both sides of the absorbent main body in the longitudinal direction,

the leakage preventing cuff has an upright portion which is upright to the wearer side,

the rising portion extends outward in the longitudinal direction X so as to exceed a rear end portion of the auxiliary layer located on the rear side.

<11> the pants-type absorbent article according to <10>, wherein,

Side elastic members for raising the raising portion are disposed at or near both side edges of the absorber in the longitudinal direction.

<12> the pants-type absorbent article according to <9>, wherein,

the auxiliary layer has a widened portion with the lateral length increasing as going from the back side outer body to the abdomen side outer body.

<13> the pants-type absorbent article according to <12>, wherein,

the auxiliary layer has the widened portion at a position at or near a lower end edge of the abdomen-side outer body, in which the lateral length of the auxiliary layer continuously increases.

<14> the pants-type absorbent article according to <12> or <13>, wherein,

the abdomen-side first stretchable region overlaps the widened portion when the absorbent article is viewed in plan.

<15> the pants-type absorbent article according to <13> or <14>, wherein,

the lower end edge of the abdomen-side outer body overlaps the widened portion.

<16> the pant-type absorbent article according to any of the above <1> to <15>, wherein,

the back side extension portion is formed with a curved portion that is curved so that the lateral length becomes gradually shorter as going toward the crotch portion that is the lower side.

<17> the pant-type absorbent article according to any of the above <1> to <16>, wherein,

the backside extension is formed such that a width in a lateral direction from a terminal end of one side to a terminal end of the other side is greater than a width in the lateral direction of the absorbent body.

<18> the pant-type absorbent article according to any of the above <1> to <17>, wherein,

the absorbent body has a liquid permeable topsheet disposed relatively close to the skin of the wearer,

the front sheet transversely crosses the skin-facing surface side of the absorber, and the extension of the front sheet extending from both side edges of the absorber in the longitudinal direction is rolled up to the non-skin-facing surface side of the absorber.

<19> the pant-type absorbent article according to any of the above <1> to <18>, wherein,

the pair of leakage preventing cuffs are provided so as to overlap the first back side stretch region when the pants-type absorbent article is viewed in plan.

<20> the pant-type absorbent article according to any of the above <1> to <19>, wherein,

the rigidity of the central region of the absorber is higher than the rigidity of the side regions of the absorber.

<21> the pant-type absorbent article according to any of the above <1> to <20>, wherein,

the auxiliary layer has a low rigidity portion extending in the longitudinal direction and having a rigidity lower than that of other portions in the auxiliary layer.

<22> the pants-type absorbent article according to <21>, wherein,

one end of the low rigidity portion located on the abdomen-side outer body side exceeds the lower end edge of the abdomen-side outer body to a position overlapping with the waist wrinkles of the abdomen-side outer body.

<23> the pant-type absorbent article according to any of the above <1> to <22>, wherein,

in the arrangement region of the absorbent polymer in the absorbent sheet, the absorbent polymer is arranged in such a manner that a macroscopically visible gap is not observed.

<24> the pants-type absorbent article according to <23>, wherein,

the 2 fibrous sheets have sites directly joined by an adhesive without the absorbent polymer.

<25> the pant-type absorbent article according to any of the above <1> to <24>, wherein,

the proportion of the particles of the absorbent polymer in the absorbent sheet is preferably 60 mass% or more, more preferably 70 mass% or more, and preferably 95 mass% or less, more preferably 90 mass% or less.

<26> the pant-type absorbent article according to any of the above <1> to <25>, wherein,

at application of 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness of the absorbent sheet measured under the pressure of (a) is preferably 0.3mm or more, more preferably 0.6mm or more, and preferably 5mm or less, more preferably 2mm or less.

Industrial applicability

According to the pants-type absorbent article of the present invention, deformation of the absorber can be prevented without impairing the fit of the thin absorber. Further, according to the pants-type absorbent article of the present invention, the wearer can easily move the legs. Further, according to the pants-type absorbent article of the present invention, the appearance in the worn state is good like pants.

Claims

1. A pants-type absorbent article comprising a abdomen-side outer body disposed on the abdomen side of a wearer, a back-side outer body disposed on the back side of the wearer, and an absorbent body fixed to the abdomen-side outer body and the back-side outer body so as to bridge between the abdomen-side outer body and the back-side outer body, and comprising a longitudinal direction extending between the abdomen-side outer body and the back-side outer body and a transverse direction orthogonal to the longitudinal direction, and comprising a side seal portion formed by joining both side portions of the abdomen-side outer body and the back-side outer body to each other, characterized in that:

the back side first stretchable region does not overlap the lateral center region of the absorber and overlaps a side region adjacent to the center region when the absorbent article is viewed from above,

2. The pant-type absorbent article of claim 1, wherein:

3. The pant-type absorbent article of claim 2, wherein:

4. A pant-type absorbent article according to claim 2 or 3, wherein:

5. The pant-type absorbent article according to any of claims 1 to 4, wherein:

6. The pant-type absorbent article according to any of claims 2 to 5, wherein:

7. The pant-type absorbent article of claim 6, wherein:

8. The pant-type absorbent article according to any of claims 1 to 7, wherein:

the absorbent body has an auxiliary layer superposed on the absorbent sheet,

9. The pant-type absorbent article of claim 8, wherein:

the rising portion extends longitudinally outward beyond a back end portion of the auxiliary layer on the back side.

10. The pant-type absorbent article of claim 9, wherein:

11. The pant-type absorbent article of claim 8, wherein:

12. The pant-type absorbent article of claim 11, wherein:

13. The pant-type absorbent article of claim 11 or 12, wherein:

14. The pant-type absorbent article of claim 12 or 13, wherein:

the lower end edge of the abdomen-side outer body overlaps the widened portion.

15. The pant-type absorbent article according to any of claims 1 to 14, wherein:

16. The pant-type absorbent article according to any of claims 1 to 15, wherein:

17. The pant-type absorbent article according to any of claims 1 to 16, wherein:

18. The pant-type absorbent article according to any of claims 1 to 17, wherein:

19. The pant-type absorbent article according to any of claims 1 to 18, wherein:

20. The pant-type absorbent article according to any of claims 1 to 19, wherein:

21. The pant-type absorbent article of claim 20, wherein:

22. The pant-type absorbent article according to any of claims 1 to 21, wherein:

23. The pant-type absorbent article of claim 22, wherein:

24. The pant-type absorbent article according to any of claims 1 to 23, wherein:

the proportion of the particles of the absorbent polymer in the absorbent sheet is 60 mass% or more and 95 mass% or less.

25. The pant-type absorbent article according to any of claims 1 to 23, wherein:

the proportion of the particles of the absorbent polymer in the absorbent sheet is 70 mass% or more and 90 mass% or less.

26. The pant-type absorbent article according to any of claims 1 to 25, wherein:

at application of 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness of the absorbent sheet is 0.3mm or more and 5mm or less as measured under the pressure of (a).

27. The pant-type absorbent article according to any of claims 1 to 25, wherein:

At application of 4.9mN/cm ² (＝0.5gf/cm ² ) The thickness of the absorbent sheet is 0.6mm or more and 2mm or less as measured under the pressure of (a).