CN109475441B

CN109475441B - Absorbent article

Info

Publication number: CN109475441B
Application number: CN201680088024.4A
Authority: CN
Inventors: 木下英之; 西谷和也; 安井真理; 西村规世子
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2016-07-29
Filing date: 2016-07-29
Publication date: 2021-07-27
Anticipated expiration: 2036-07-29
Also published as: KR102341224B1; CN109475441A; WO2018020690A1; KR20190038575A; MY190356A; JP6705839B2; JPWO2018020690A1

Abstract

An absorbent article (1) is provided with: an absorbent core (31) disposed in the crotch region (S1) and the rear region (S3); a skin surface sheet (10) disposed on the skin-facing surface side of the absorbent core (31); and a central pressing groove (81) formed in the absorbent core (31) and the skin surface sheet (10). At the center of the rear side region (S3) in the width direction (W): a plurality of high rigidity regions (R1) in which a central pressing groove (81) is arranged along the longitudinal direction (L); and low-rigidity regions (R2) which are arranged between the high-rigidity regions (R1) in the longitudinal direction (L) and have lower rigidity than the high-rigidity regions (R1).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a sanitary napkin.

Background

Patent document 1 discloses an absorbent article having a concave groove. The concave grooves of patent document 1 are formed in the absorbent body, and are intermittently arranged in the longitudinal direction in the rear region. In the absorbent article of patent document 1, the absorbent body is folded in the region between the concave grooves, and the rear region is arranged along the buttocks.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2006-263205

Disclosure of Invention

Since the concave groove of patent document 1 is formed only in the absorbent body and is not formed integrally with the top sheet, sufficient rigidity may not be obtained. Therefore, when the absorbent article is repeatedly deformed with the concave grooves as base points, the shape of the concave grooves is deformed, and the desired deformed state of the absorbent body may not be maintained. Therefore, curling or undesired bending of the absorbent body may occur, and the fit to the body may be reduced.

The present invention has been made in view of the above problems, and an object thereof is to provide an absorbent article which can suppress curling or undesired bending and improve fit to the body.

An absorbent article according to the present invention includes a longitudinal direction (longitudinal direction L) and a width direction (width direction W) orthogonal to each other, a crotch region (crotch region S1) located in the crotch of a wearer, a rear region (rear region S3) located more rearward than the crotch region, absorbent cores (absorbent members 31) disposed in the crotch region and the rear region, a skin sheet (skin sheet 10) disposed on the skin-facing side than the absorbent cores, and a central pressing groove (central pressing groove 81) formed in the absorbent cores and the skin sheet, and is characterized in that: a plurality of high rigidity regions (high rigidity regions R1) in which the central pressing groove is arranged along the longitudinal direction; and low rigidity regions (low rigidity regions R2) which are arranged between the high rigidity regions in the longitudinal direction and have lower rigidity than the high rigidity regions.

Drawings

Fig. 1 is a plan view of an absorbent article in one embodiment.

Fig. 2 is a rear view of the absorbent article shown in fig. 1.

Fig. 3 is an enlarged view of the X portion shown in fig. 1.

Fig. 4 is a view schematically showing a wearing state of the absorbent article in a cross section taken along the line a-a shown in fig. 1.

Fig. 5 is a view schematically showing a wearing state of the absorbent article in a cross section taken along the line B-B shown in fig. 1. Fig. 5(a) shows a state in which a wearer wearing the absorbent article stands, and fig. 5(b) shows a state in which the body of a supine wearer is pressed by bedding and deformed.

Fig. 6 is a perspective view of the absorbent article in a state worn by a wearer in a standing state.

Detailed Description

At least the following matters will be made clear from the description of the present specification and the drawings.

An absorbent article having:

a length direction and a width direction orthogonal to each other;

a crotch region located below the crotch of the wearer;

a rear region located on the rear side of the crotch region;

an absorbent core disposed in the crotch region and the back region;

a skin surface sheet disposed on the skin-facing surface side of the absorbent core; and

a central compressed groove formed in the absorbent core and the skin panel,

it is characterized in that the preparation method is characterized in that,

at the center in the width direction of the rear region, there are provided: a plurality of high rigidity regions in which the central pressing groove is arranged along the longitudinal direction; and a low rigidity region that is disposed between the high rigidity regions in the longitudinal direction and has a rigidity lower than that of the high rigidity regions.

A high rigidity region having a central compressed groove arranged along the longitudinal direction is provided at the center of the absorbent core in the width direction. When a force is applied from the outside in the width direction to the inside in the width direction during wearing, the center in the width direction of the absorbent core is deformed into a convex shape toward the wearer with the high-rigidity region as a deformation base point in a cross section along the width direction, and fits into the gap between the left and right buttocks. Low rigidity regions are provided between the high rigidity regions in the longitudinal direction. The center in the width direction of the absorbent core is arranged along the curvature of the body in the front-back direction with the low-rigidity region as a deformation base point in a cross section along the longitudinal direction.

The central crush groove of the high stiffness region is formed in the skin panel and the absorbent core, and has high stiffness as compared to a structure formed only in the absorbent core. Therefore, even when the absorbent article is repeatedly deformed during wearing, the high rigidity region continuously acts as a deformation base point, and the curling and the undesired bending of the absorbent core can be suppressed, and the fit to the body can be improved.

In such an absorbent article, it is preferable that,

having a joint for securing the absorbent article to the undergarment,

the low rigidity region is located on the front side of the rear end edge of the joint portion.

The curvature of the arc of the buttocks varies in a section along the longitudinal direction. The portion of the hip where the curvature of the arc changes greatly is a portion that is easily deformed when worn. In order to make the absorbent article more conform to the contours of the buttocks, it is preferable to dispose a low rigidity region at a portion where the change in curvature of the body is large. On the other hand, in order to maintain the fixed state to the underwear by the joint portion, the joint portion is preferably arranged on the rear side of the portion where the change in curvature of the hip is large. Since the low rigidity region is located on the front side of the rear end edge of the joint portion, the low rigidity region can be disposed so as to correspond to a portion where the change in curvature of the buttocks is large, and the joint portion can be disposed so as to correspond to a portion located on the rear side of the portion where the change in curvature of the buttocks is large. The low rigidity region serves as a deformation base point, and can deform the absorbent article along the curvature of the buttocks. Further, since the joint portion is located on the rear side of the portion where the curvature change of the curvature of the hip is large, the joint portion is not easily deformed during wearing, and the joined state to the underwear is easily maintained.

In such an absorbent article, it is preferable that,

the absorbent core having a low basis weight region having a lower basis weight of absorbent material than the surrounding absorbent core,

the low-basis weight region is disposed in the low-rigidity region and has an inclined portion extending outward in the width direction from the low-rigidity region,

the outer edge of the inclined portion extends from the outer side in the width direction to the inner side in the width direction as it goes to the rear side.

According to such an absorbent article, since the low rigidity region is disposed in the low basis weight region, the low rigidity region is easily deformed, and more easily functions as a deformation base point of the absorbent article. Further, when the wearer wears the wearing device, the crotch region is sandwiched between the legs of the wearer, and a force is applied to the rear region from the outside in the width direction to the inside in the width direction and from the crotch region side to the rear region. Since the outer edge of the inclined portion extends inward in the width direction as it goes to the rear side, the inclined portion deforms by a force from the crotch region side. Therefore, deformation due to force from the legs of the wearer is absorbed by the inclined portion, and occurrence of undesired wrinkles or curls can be suppressed, thereby improving fit to the body.

In such an absorbent article, it is preferable that,

in the inclined portion of the low basis weight region, a lateral crush groove formed at least in the absorbent core and extending in the width direction is provided.

According to such an absorbent article, the lateral pressing groove serves as a deformation base point extending in the width direction in the inclined portion. Therefore, the absorbent article is easily deformed in accordance with the curvature of the body in the front-rear direction not only at the center of the rear region in the width direction but also over the entire width direction of the rear region. The absorbent article is disposed further along the buttocks, and the fit to the body can be further improved.

In such an absorbent article, it is preferable that,

the lateral pressing groove extends from the outer side in the width direction to the inner side in the width direction as going toward the rear side.

When the wearer's legs are sandwiched between the wearer's legs, a force is applied to the rear region in a direction from the front side to the rear side and from the widthwise outer side to the widthwise inner side. The lateral pressing groove extends from the outer side in the width direction to the inner side in the width direction as it goes to the rear side, and easily transmits the force along the force from the wearer's legs. The lateral pressing grooves transmit forces from both legs of the wearer to the center side in the width direction, and the high-rigidity region is easily raised toward the wearer. The absorbent article is disposed further along the buttocks, and the fit to the body can be further improved.

In such an absorbent article, it is preferable that,

on both outer sides of the high rigidity region of the back region, a pair of longitudinal pressing grooves formed at least in the absorbent core and extending in the longitudinal direction are provided.

According to such an absorbent article, when a force is applied to the rear region in a direction from the outer side in the width direction toward the inner side in the width direction, the pair of longitudinal pressing grooves serve as deformation base points, and the region between the pair of longitudinal pressing grooves is likely to bulge toward the wearer. The high rigidity region is likely to bulge toward the wearer's side, and the absorbent article is arranged further along the buttocks, whereby the fit to the body can be further improved.

In such an absorbent article, it is preferable that,

the longitudinal pressing grooves are arranged at intervals in the length direction,

the regions between the longitudinal squeezing grooves are provided at positions that constitute the base points of deformation together with the low rigidity regions when worn.

According to such an absorbent article, since the longitudinal pressing grooves are arranged at intervals, the region between the longitudinal pressing grooves in the cross section along the longitudinal direction serves as a deformation base point, and the absorbent article is easily arranged along the curvature in the front-rear direction of the body. Further, since the region between the longitudinal compressed grooves and the low rigidity region together constitute a base point of deformation when worn, the entire region in the width direction including the center in the width direction of the rear region is easily arranged along the curvature in the front-rear direction of the body, and fitting to the body can be further improved.

In such an absorbent article, it is preferable that,

the rigidity of the central pressing groove is lower than that of the longitudinal pressing grooves.

According to such an absorbent article, when a force in a direction from the widthwise outer side toward the widthwise inner side is applied to the rear region, the central compressed groove is more easily deformed than the longitudinal compressed groove, and is more easily raised toward the wearer's side. Further, since the rigidity of the central compressed groove is low, even when the central compressed groove is in close contact with the buttocks during wearing, the feeling of discomfort during wearing can be suppressed, and the feeling of touch on the skin can be improved. Further, since the rigidity of the longitudinal pressing grooves is higher than that of the central pressing groove, the force in the direction from the outer side in the width direction toward the inner side in the width direction can be easily transmitted to the region between the longitudinal pressing grooves in the width direction by the longitudinal pressing grooves, and the central pressing groove is more likely to bulge toward the wearer's side. The high rigidity region is likely to bulge toward the wearer's side, and the absorbent article is arranged further along the buttocks, whereby the fit to the body can be further improved.

In such an absorbent article, it is preferable that,

the low rigidity region has a first low rigidity region and a second low rigidity region located at a rear side than the first low rigidity region.

By having the first low rigidity region and the second low rigidity region, the deformation base points at least two locations are formed in the cross section along the longitudinal direction, and are arranged further along the curvature of the buttocks, and the high rigidity region is more likely to rise toward the wearer, and the fit to the body can be further improved. The first low rigidity region is disposed so as to be able to be in contact with the front end portion (end portion on the crotch side) of the portion where the bulging portions of the buttocks of the wearer are squashed in the state where the wearer lies on the back. The second low rigidity region can be disposed so as to be in contact with a portion of the wearer's hip that protrudes outward and has a large curvature change when the wearer is standing. By providing the first low rigidity region and the second low rigidity region in this way, the deformation base point of the absorbent article can be provided at a portion of the body where the curvature change is large regardless of whether the wearer is lying on his back or standing, and curling or undesired bending of the absorbent core can be suppressed, and the fit to the body can be further improved.

In such an absorbent article, it is preferable that,

a pair of three-dimensional gathers which can rise toward the wearer side are provided on both outer sides in the width direction of the absorbent article,

each of the three-dimensional gathers has an elastic member that expands and contracts in the longitudinal direction, and has a standing portion that can stand up from the top sheet,

at least a part of the low rigidity region is disposed on the rear side of the rear end edge of the rising portion.

At least a part of the low rigidity region may be disposed so as to be a deformation origin point in a cross section along the front-rear direction, and to be in contact with a portion where the curvature of the hip portion changes greatly. The absorbent article deforms at a position in contact with a portion where the curvature change of the buttocks is large, with the low rigidity region as a base point, and bends so as to be close to the front region and the rear region of the low rigidity region. In addition, in a state where the wearer stands, the standing portions of the three-dimensional gathers stand up so as to connect the front end edges of the standing portions and the rear end edges of the standing portions in a cross section along the front-rear direction. Since at least a part of the low rigidity region is provided on the rear side of the raised portion with respect to the raised region, in the raised region of the raised portion of the three-dimensional gather, the deformation base point corresponding to the portion where the curvature change of the buttocks is large is not formed, and the raised state of the base gather can be maintained.

In such an absorbent article, it is preferable that,

the low rigidity region has a first low rigidity region and a second low rigidity region located at a rear side than the first low rigidity region,

the first low rigidity region is disposed on the front side of the rear end edge of the rising portion,

the second low rigidity region is disposed on the rear side of the rear end edge of the rising portion.

According to such an absorbent article, the deformation origin point by the first low rigidity region and the deformation origin point by the second low rigidity region can be provided, and the absorbent article can be easily arranged along the curvature in the front-rear direction of the body. The first low rigidity region is disposed so as to be able to be in contact with the front side end portion of the portion where the bulging portions of the buttocks of the wearer are squashed in a state where the wearer lies on the back. The second low rigidity region is disposed so as to contact a portion of the wearer, which protrudes outward from the buttocks and has a large curvature change, while the wearer is standing.

Since the second low rigidity region is provided on the rear side of the raised portion in the standing state of the wearer, the raised state of the three-dimensional gather can be maintained without forming a base point of deformation by the second low rigidity region in the raised portion of the three-dimensional gather in the standing state of the wearer. In addition, the absorbent article is sandwiched between the wearer and the bedding in a state in which the wearer is sleeping. Specifically, the wearer in the supine position has the swollen portions of the buttocks squashed. The absorbent article is sandwiched between the wearer and the bedding on the rear side of the front end of the squashed portion of the buttocks, and is disposed along the body without being sandwiched between the wearer and the bedding on the front side of the squashed portion of the buttocks (on the front side of the front end of the squashed portion of the buttocks). Therefore, the standing part of the three-dimensional gather stands up so as to connect the position where the front end edge of the standing part and the part crushed by the swelling part of the hip part come into contact with each other in the cross section along the front-rear direction. Therefore, in the raised region of the raised portion in the bedtime state, the deformation base point by the first low rigidity region is not formed, and the raised state of the three-dimensional gathers can be maintained.

The present invention relates to an absorbent article according to the present embodiment

Next, an absorbent article according to an embodiment will be described with reference to the drawings. The absorbent article may be any absorbent article such as a pantiliner (panty liner), a sanitary napkin, an incontinence pad, a disposable diaper, and the like. In the following embodiments, a disposable sanitary napkin will be described as an example of an absorbent article.

In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic, and in some cases, the ratio of each dimension or the like is different from the actual case. Thus, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings may include portions having different dimensional relationships and ratios from each other.

Fig. 1 is a plan view of an absorbent article in one embodiment. Fig. 2 is a rear view of the absorbent article. Fig. 3 is an enlarged view of the X portion shown in fig. 1. In fig. 3, the three-dimensional gathers are omitted. The absorbent article 1 has a longitudinal direction L and a width direction W orthogonal to each other, and has a thickness direction T extending from the skin facing surface side T1 of the wearer to the non-skin facing surface side T2. The skin facing side T1 corresponds to a side facing the skin of the user when in use. The non-skin facing surface side T2 corresponds to the side opposite to the skin facing surface side T1 in use, i.e., the side opposite to the skin of the wearer.

The absorbent article 1 has a crotch region S1, a front region S2, and a back region S3. The crotch region S1 is a region facing an excretory opening of the wearer, for example, a vaginal opening. When the absorbent article 1 is attached to underwear, the crotch region S1 is disposed in the crotch portion of the underwear and is a region disposed between the legs of the wearer. The front region S2 is located more anteriorly than the crotch region S1. The front end edge of the front side region S2 defines the front end edge of the absorbent article 1. The rear region S3 is located more rearward than the crotch region S1. The rear end edge of the rear region S3 defines the rear end edge of the absorbent article 1.

The absorbent article 1 has flaps 3 and hip flaps 4. The flaps 3 and the hip flaps 4 extend outward in the width direction W from the outer edge of the absorbent body 30 in the crotch region S1. The flap 3 is disposed in the crotch region S1. The leading edge of the vane 3 is defined by the root of the vane 3 and corresponds to a portion located on the front side of two portions that are most recessed inward in the width direction W. The front end edge of the flap 3 defines the boundary between the crotch region S1 and the front region S2. The rear end edge of the vane 3 is defined by the root of the vane 3 and corresponds to a portion located on the rear side of the two portions that are most recessed inward in the width direction W. The rear end edge of the flap 3 defines the boundary between the crotch region S1 and the rear region S3. The center in the longitudinal direction L of the crotch region S1 coincides with the center in the longitudinal direction of the flap. The hip flap 4 is provided in the rear region S3.

The absorbent article 1 includes a skin-facing sheet 10, a non-skin-facing sheet 20, and an absorber 30. The skin sheet 10 is provided on the skin facing surface side T1 with respect to the absorber 30. The skin sheet 10 has a top sheet 11 and side sheets 12. The top sheet 11 is a liquid-permeable sheet that permeates liquid such as body fluid. The side sheet 12 covers the outer edge of the top sheet 11 in the width direction W and extends outward in the width direction W than the top sheet 11. The non-skin top sheet 20 is a liquid impermeable sheet. The non-skin surface sheet 20 is provided on the non-skin surface side T2 with respect to the absorber 30.

The non-skin-facing sheet 20 is provided with a joint 60 for fixing the absorbent article to underwear. The joint 60 has: the first body joint 61 disposed in the crotch region S1 in the region overlapping the absorbent body 30, the second body joint 62 disposed in the rear side region S3 in the region overlapping the absorbent body 30, the flap joint 63 disposed in the flap 3, and the flap joint 64 disposed in the hip flap 4.

A pair of three-dimensional gathers 70 that can rise toward the wearer's side are provided on both outer sides of the absorbent article 1 in the width direction W. Each of the three-dimensional gathers 70 has an elastic member 71 that stretches and contracts in the longitudinal direction L. The elastic member 71 is disposed on the inner edge of the side sheet 12. Each of the three-dimensional gathers 70 has: a rising portion 72 that can rise from the top sheet 11 as the skin sheet 10, and a base end portion 73 that is fixed to the top sheet 11 and cannot rise. The base end portions 73 are disposed on the front and rear sides of the rising portion 72. The base end 73 is a portion indicated by hatching in fig. 1.

The absorber 30 is disposed between the skin sheet 10 and the non-skin sheet 20. The absorber 30 is disposed at least in the crotch region S1 and the rear region S3. The absorbent body 30 has an absorbent core 31 made of an absorbent material for absorbing liquid, and a cover sheet (not shown in the figure) for covering the absorbent core 31. The absorber 30 has a low basis weight region 41 and a high basis weight region 42. Here, the "low area weight region" refers to a region constituted by the absorbent core 31 having a lower weight per area than the absorbent core 31 around it, or a region without the absorbent core 31. The high basis weight region 42 is a region other than the low basis weight region 41.

The low area weight region 41 has: a first low area weight region 411 spanning the boundary between the crotch region S1 and the rear region S3, a second low area weight region 412 disposed along the longitudinal direction L in the rear region S3, and a third low area weight region 413 extending along the width direction W in the rear region S3. The absorbent article of the present embodiment may have at least the second low basis weight region 412. The second low area weight region 412 extends in the longitudinal direction L at the center in the width direction W of the rear side region S3. The front end edge of the second low area weight region 412 is continuous with the rear end edge of the first low area weight region 411, and the rear end edge of the second low area weight region 412 is located on the front side of the rear end edge of the absorbent core 31.

The third low area weight region 413 is continuous with the second low area weight region 412 and extends outward in the width direction W from the second low area weight region 412. A plurality of third low area weight regions 413 are provided at intervals in the longitudinal direction L. The inner edge of the third low area weight region 413 is continuous with the second low area weight region 412, and the outer edge of the third low area weight region 413 is positioned further inward in the width direction than the outer edge of the absorbent core 31. The third low area weight region 413 has an inclined portion 44. The inclined portion 44 extends in the width direction W from a low rigidity region R2 described later. The outer edge 44E of the inclined portion 44 extends from the outer side in the width direction to the inner side in the width direction as it goes to the rear side. The shape of the inclined portion 44 in plan view is, for example, a trapezoid, a semicircle, or a triangle in which the length in the width direction becomes shorter as it goes to the rear side. In fig. 1, the inclined portion 44 is indicated by hatching.

In the present specification, "the basis weight of the absorbent body" is measured by the following measurement method. When the absorbent article 1 is sealed in a packaging bag or the like, it is taken out from the packaging bag, and a sample is used which is left in this state for 12 hours in an atmosphere of 20 ℃ ± 2 ℃ and a relative humidity of 60% ± 5% RH.

In an absorbent article packaged in a package, the package is opened, the folded absorbent article is unfolded, a portion for measuring the weight per unit area is cut out from the absorbent article, and the weight of the cut portion is measured. Next, the parts other than the absorbent body, such as the skin sheet and the non-skin sheet, were removed from the cut parts, and the weight of the absorbent body was measured. The basis weight was calculated based on the weight of the absorbent body and the area of the portion for measuring the basis weight.

The absorbent article 1 is formed with a compressed groove. The pressing groove has a central pressing groove 81, a lateral pressing groove 82, and a longitudinal pressing groove 83. The pressing groove may have at least the central pressing groove 81. The central compressed groove 81 is formed by compressing at least the top sheet 11 as the skin-facing sheet 10 and the absorbent core 31 in the thickness direction T. The lateral crush grooves 82 and the longitudinal crush grooves 83 are formed by compressing at least the absorbent core 31 in the thickness direction T. The central pressing groove 81, the lateral pressing groove 82, and the longitudinal pressing groove 83 of the present embodiment are formed in the top sheet 11, the covering sheet surface, and the absorbent core 31 in the rear side region S3. The central pressing groove 81, the lateral pressing groove 82, and the vertical pressing groove 83 are formed by an aggregate of a plurality of point-like pressing portions.

The central pressing groove 81 extends in the longitudinal direction L and constitutes a deformation base point extending in the longitudinal direction L when worn. The rigidity of the central pressing groove 81 is lower than that of the longitudinal pressing groove 83. Specific examples of the structure of the central pressing groove and the longitudinal pressing groove include: a structure in which the length of the central extrusion groove in the width direction is shorter than the length of the longitudinal extrusion groove in the width direction; the weight per unit area of the region having the central pressing groove is lower than that of the region having the longitudinal pressing groove. The lateral compressed grooves 82 extend in the width direction W at both outer sides in the width direction W than the central compressed groove 81, and constitute deformation base points extending in the width direction W during wearing. The lateral pressing groove 82 extends from the outside in the width direction W to the inside in the width direction W as it goes from the front side to the rear side. The central pressing groove 81 and the lateral pressing grooves 82 are formed in the low area weight region 41. At least a part of the lateral pressing groove 82 is provided in the inclined portion 44 of the low basis weight region 41.

The longitudinal squeezing grooves 83 extend in the longitudinal direction L at both outer sides in the width direction W than the central squeezing groove 81 and the lateral squeezing grooves 82, and constitute deformation base points extending in the longitudinal direction L during wearing. The longitudinal pressing groove 83 is formed across the low unit area weight region 41 and the high unit area weight region 42. The longitudinal pressing grooves 83 are provided at intervals in the longitudinal direction. The regions 83G between the longitudinal pressing grooves 83 are provided at positions which constitute base points of deformation together with a low rigidity region R2 to be described later when worn. Examples of the position that constitutes the base point of deformation together with the low rigidity region R2 include: a region overlapping with the second low area weight region 412; a region on an extension of the second low area weight region 412; an area on an extension of the lateral pressing groove 82; a region extending outward in the width direction from the low rigidity region R2; and a region extending diagonally forward from the low rigidity region R2 to the outer side in the width direction.

A high stiffness region R1 and a low stiffness region R2 are provided at the center in the width direction W of the rear region S3 of the absorbent article 1. In fig. 3, the high rigidity region R1 and the low rigidity region R2 are indicated by different oblique lines. The high rigidity region R1 and the low rigidity region R2 are provided in the low basis weight region 41 and function as deformation base points of the absorbent article 1. The high rigidity region R1 is a region where the central compressed groove 81 is arranged, and serves as a deformation origin point bulging toward the wearer when worn. The length of the high rigidity region R1 in the longitudinal direction L is longer than the length of the low rigidity region R2 in the longitudinal direction L. The low rigidity region R2 is a region between the central compressed grooves 81, and serves as a base point of curvature deformation of the absorbent article along the front-rear direction of the body when worn. In the low rigidity region R2, the center pressing groove 81 is not provided. The high stiffness region R1 and the low stiffness region R2 are provided in the second low basis weight region 412, and since the absorbent core has a low basis weight, it is easily deformed, and therefore easily functions as a deformation base point.

The low rigidity region R2 has lower rigidity than the high rigidity region R1. This rigidity is an index indicating the degree of difficulty of deformation, and the higher the rigidity, the harder it is to bend. The rigidity can be measured by a gurley rigidity value based on the measurement method of JIS L1096. In the present embodiment, three high rigidity regions R1 are provided at intervals in the longitudinal direction L. The low rigidity region R2 has a first low rigidity region R21, and a second low rigidity region R22 located at the rear side of the first low rigidity region R21. Therefore, at least two deformation base points are formed in the cross section of the absorbent article 1 along the longitudinal direction L, and the absorbent article is easily arranged along the curvature of the buttocks.

The curvature of the shape, particularly the curvature of the buttocks, varies greatly depending on the body position and the part of the wearer, in the cross section along the longitudinal direction of the wearer. Specifically, as shown in fig. 5, in the portion P2 where the buttocks project outward most in the standing state, the curvature of the buttocks changes greatly, and in the state where the wearer is lying on his back, the curvature of the buttocks changes greatly at the front end P1 of the portion where the buttocks contact the bedding and are squashed. In order to make the rear region of the absorbent article more fit to the body, the first and second low rigidity regions R21 and R22 may be provided at positions corresponding to a portion P1 where the change in curvature of the buttocks is large in a state where the wearer lies on the back (the front side end portion of the portion where the buttocks are pressed into contact with bedding) and a portion P2 where the change in curvature of the buttocks is large in a state where the wearer stands up (the portion where the buttocks protrude most outward).

The first low rigidity region R21 may be disposed at a position 90mm to 130mm rearward from the center in the longitudinal direction L of the crotch region S1. The crotch region S1 is easily arranged at a position 90mm to 130mm rearward from the center in the longitudinal direction L, corresponding to the portion P1 where the curvature of the buttocks changes greatly in the state where the wearer lies on his back. By providing the first low rigidity region R21 so as to correspond to a portion where the curvature of the buttocks changes greatly in the state where the wearer is lying on his back, the absorbent article is easy to follow the body in the state where the wearer is lying on his back, and the gap between the absorbent article and the body can be reduced.

The second low rigidity region R22 may be disposed at a position 130mm to 170mm rearward from the center in the longitudinal direction L of the crotch region S1. The crotch region S1 is easily arranged at a position 130mm to 170mm rearward from the center in the longitudinal direction L thereof so as to correspond to the portion P2 where the change in curvature of the buttocks is large in a standing state of the wearer. By providing the second low rigidity region R22 so as to correspond to the portion P2 where the change in curvature of the buttocks is large in the state where the wearer stands, the absorbent article is easy to follow the body at the portion P2 where the buttocks protrude most outward in the state where the wearer stands, and the gap between the absorbent article and the body can be reduced.

The first low rigidity region R21 is disposed on the front side of the rear end edge of the standing portion 72 of the three-dimensional gather 70. The first low rigidity region R21 is provided at a position in contact with the front side portion P1 where the bulging portions of the buttocks are squashed in a state where the wearer lies on his back. The absorbent article is sandwiched between the wearer and the bedding on the rear side of the front side portion P1 where the bulge portions of the buttocks are crushed, and the absorbent article is arranged along the body without being sandwiched between the wearer and the bedding on the front side of the portion where the bulge portions of the buttocks are crushed. Therefore, the standing portion 72 of the three-dimensional gather is raised so as to connect the position where the front end edge of the standing portion contacts the squashed portion of the raised portion of the hip portion in the cross section along the front-rear direction. Therefore, even if the first low rigidity region R21 is disposed on the front side of the rear end edge of the standing part 72 of the three-dimensional gather 70, the standing state of the three-dimensional gather 70 can be maintained without forming a deformation base point by the first low rigidity region R21 in the standing region of the standing part in the bedtime state.

The second low rigidity region R22 is located on the rear side of the rear end edge of the standing portion 72 of the three-dimensional gather 70. Since the second low rigidity region R22 is provided on the rear side of the standing region of the standing part in the state where the wearer stands, the standing state of the three-dimensional gather can be maintained without forming a deformation base point by the second low rigidity region R22 in the standing region of the standing part 72 of the three-dimensional gather 70.

The low rigidity region R2 is located on the front side of the rear end edge of the joint portion 60. The rear end edge of the joint portion is the rear end edge of the entire joint portion, and in the present embodiment, the rear end edge of the second body joint portion 62. The first low rigidity region R21 is located on the front side of the rear end edge of the flap joint portion 64 and on the front side of the rear end edge of the second body joint portion 62. The second low rigidity region R22 is located further to the front side than the rear end edge of the second body joint portion 62. In order to maintain the fixed state to the underwear, the joint portion 60 is preferably arranged on the rear side of the portion where the curvature change of the curvature of the hip is large. Since the joint portion is located on the rear side of the portion where the curvature change of the curvature of the hip is large, the joint portion is less likely to be deformed when worn, and the joined state to the underwear is easily maintained. By arranging the low rigidity region R2 corresponding to a portion where the change in curvature of the buttocks is large, the low rigidity region R2 is arranged along the curvature of the buttocks, and by providing the joint portion on the rear side of the portion where the change in curvature of the buttocks is large, the joined state to the underwear by the joint portion can be maintained. Thus, the fit to the body can be improved.

Next, a wearing state of the absorbent article will be described with reference to fig. 4 to 6. Fig. 4 schematically shows a deformed state of the absorbent article in a cross section along the width direction. The deformation state of the absorbent article configured as described above when worn will be described. The absorbent article is sandwiched between the legs of the wearer when worn, and exerts a force from the outside in the width direction toward the inside in the width direction. When a force is applied to the absorbent article 1 from the outside in the width direction W toward the inside in the width direction while wearing, the region between the central compressed grooves 81 bulges toward the wearer side with the longitudinal compressed grooves 83 as a base point, and deforms so that the central compressed grooves 81 form vertices. The center of the absorbent core in the width direction is deformed into a convex shape toward the wearer with the high-rigidity region as a deformation origin point, and fits in the gap between the left and right buttocks. In this case, since the rigidity of the central compressed groove is lower than that of the longitudinal compressed groove, when a force in a direction from the outer side in the width direction to the inner side in the width direction is applied to the rear region, the central compressed groove is more easily deformed than the longitudinal compressed groove and more easily bulges toward the wearer's side. In addition. Since the rigidity of the central pressing groove is low, the feeling of discomfort during wearing can be suppressed and the feeling of the skin can be improved even when the central pressing groove is in close contact with the buttocks during wearing.

Fig. 5 schematically shows a deformed state of the absorbent article in a cross section along the longitudinal direction. Fig. 5(a) shows a state in which a wearer wearing the absorbent article stands, and fig. 5(b) shows a state in which the body of a supine wearer is pressed by bedding and deformed. The second low rigidity region R22 is disposed in contact with the portion P2 where the curvature of the wearer changes greatly when the wearer stands. In the center in the width direction of the absorbent core in a state where the wearer stands, the second low stiffness region R22 is arranged along the curvature in the front-back direction of the body as a deformation base point in a cross section along the longitudinal direction. The first low rigidity region R21 is disposed in contact with a portion P1 having a large curvature change at the front end of the portion where the bulging portions of the buttocks are squashed in a state where the wearer lies on the back. The central compressed groove 81 formed in the high rigidity region R1 is formed in the top sheet 11 and the absorbent core 31, and has a higher rigidity than a structure formed only in the absorbent core 31. Therefore, even when the absorbent article 1 is repeatedly deformed during wearing, the high rigidity region R1 continues to function as a deformation base point, and the curling or the undesired bending of the absorbent core 31 can be suppressed, thereby improving the fit to the body.

In the rear region, a central pressing groove 81, a lateral pressing groove 82, and a vertical pressing groove 83 are formed, and the pressing grooves divide the rear region into a plurality of sections. Therefore, even when the absorbent article 1 is repeatedly deformed during wearing, the high rigidity region R1 continues to function as a deformation base point, and the curling or the undesired bending of the absorbent core 31 can be suppressed, thereby improving the fit to the body. In the rear region, a central pressing groove 81, a lateral pressing groove 82, and a vertical pressing groove 83 are formed, and a plurality of sections are defined by the pressing grooves. Therefore, even when the absorbent article 1 is repeatedly deformed during wearing, the absorbent material is less likely to be displaced, and the absorbent core can be kept in contact with the body.

Further, outside the low rigidity region R2 in the width direction, an inclined portion 44 extending outward in the width direction from the low rigidity region and a lateral pressing groove 82 formed in the inclined portion are provided. The inclined portion and the lateral pressing groove 82 each function as a deformation base point extending in the width direction. Thus, the absorbent core is disposed along a cross section along the front-rear direction of the body in not only the center in the width direction of the rear side region but also the entire width direction of the rear side region. The absorbent article is disposed more along the buttocks, and the fit can be improved.

Further, since the vertical squeezing grooves 83 are arranged at intervals, in a cross section along the longitudinal direction, the region 83G between the vertical squeezing grooves 83 is arranged along the curvature of the body as a deformation base point. Since the regions between the longitudinal compressed grooves and the low rigidity region R2 together constitute the base points of deformation, the entire region in the width direction including the center in the width direction of the posterior region is arranged along the curvature in the anterior-posterior direction of the body. Thus, the entire back side area of the absorbent article is easily fitted to the body.

Fig. 6 is a perspective view schematically showing the absorbent article in a state of being worn by a standing wearer. When worn, the crotch region is sandwiched between the legs of the wearer, and a force is applied from the outside in the width direction to the inside in the width direction and from the crotch region side to the rear region in the rear region. Since the outer edge of the inclined portion extends inward in the width direction as it goes to the rear side, the inclined portion deforms by a force from the crotch region side, and wrinkles extending inward in the width direction as it goes to the rear side are formed in the inclined portion. The inclined portion absorbs deformation caused by a force from the legs of the wearer, and suppresses the occurrence of undesired wrinkles or curls, thereby making it possible to arrange the absorbent article more along the body. Further, since the lateral pressing groove 82 extends from the outer side in the width direction to the inner side in the width direction as it goes to the rear side, the force is easily transmitted along the force from the legs of the wearer. The lateral compressed groove 82 transmits a force from the leg of the wearer to the center side in the width direction, and the high rigidity region is easily raised toward the wearer's side. The absorbent article can be arranged further along the buttocks, and the fitting property can be improved.

The present invention has been described in detail with reference to the above embodiments, but it will be understood by those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. The description is thus for the purpose of illustration and is not intended to limit the invention in any way.

The low rigidity region in the present invention may be configured to have a lower rigidity than the high rigidity region, and may include, for example: a structure in which the weight per unit area of the absorbent material is low as compared with the high stiffness region; a structure in which the area ratio of the extrusion groove is low as compared with a high-rigidity region; at least any one of the structures forming the slits in the absorbent core.

Industrial applicability of the invention

The present invention can provide an absorbent article that can improve fit to the body by suppressing curling or undesired bending.

Description of the reference numerals

1: absorbent article

10: skin patch

20: non-skin patch

30: absorbent body

31: absorbent core

41: low area weight region

81: central extrusion groove

82: transverse extrusion groove

83: longitudinal extrusion groove

R1: high rigidity region

R2: low rigidity region

R21: first low rigidity region

R22: second low rigidity region

L: length direction of the film

W: width direction of the sheet

Claims

1. An absorbent article having:

a length direction and a width direction orthogonal to each other;

a crotch region located below the crotch of the wearer;

a rear region located on the rear side of the crotch region;

an absorbent core disposed in the crotch region and the back region;

a central compressed groove formed in the absorbent core and the skin panel,

it is characterized in that the preparation method is characterized in that,

at the center in the width direction of the rear region, there are provided: a plurality of high rigidity regions in which the central pressing groove is arranged along the longitudinal direction; and a low rigidity region which is disposed between the high rigidity regions in the longitudinal direction and has a rigidity lower than that of the high rigidity region,

the low stiffness regions are regions located between the central crush slots,

on both outer sides of the high rigidity region of the rear region, there are provided: a pair of longitudinal crush slots formed in at least the absorbent core and extending along the length direction; and a lateral crush groove formed at least in the absorbent core and extending in the width direction,

the region between the longitudinal pressing grooves is a region on an extension line of the lateral pressing grooves and is disposed in a region extending outward in the width direction from the low rigidity region,

the absorbent article further comprises a pair of three-dimensional gathers which can rise toward the wearer's side,

each of the three-dimensional gathers has an elastic member that stretches and contracts in the longitudinal direction, and has a standing portion that can stand up from the skin surface sheet,

at least a part of the low rigidity region is disposed on the rear side of a rear end edge of the rising portion.

2. The absorbent article of claim 1,

having a joint for securing the absorbent article to the undergarment,

the low rigidity region is disposed on the front side of the rear end edge of the joint portion.

3. The absorbent article of claim 1 or 2,

an outer edge of the inclined portion extends from the outer side in the width direction to the inner side in the width direction as going toward the rear side.

4. The absorbent article of claim 3,

at least the lateral pressing groove is provided in the inclined portion of the low basis weight region.

5. The absorbent article of claim 4,

6. The absorbent article of claim 1 or 2,

7. The absorbent article of claim 1 or 2,

8. The absorbent article of claim 1,

the low rigidity region has a first low rigidity region and a second low rigidity region located at the rear side than the first low rigidity region,