JP2020099445A - Absorbent article - Google Patents

Abstract

To provide an absorbent article in which fluidized excretion with relatively high viscosity is hardly adhered to a skin.SOLUTION: An absorbent article has a laminate obtained by laminating a rear face sheet, an absorber layer, and a front face sheet, in which an open hole penetrating the laminate is formed in a range including a position facing an anal of a wearer in wearing time.SELECTED DRAWING: Figure 1A

Description

The present invention relates to absorbent articles.

2. Description of the Related Art In absorbent articles such as disposable diapers, there has been known a structure that copes with leakage of highly viscous fluidized excrement such as loose stool.

For example, in Patent Document 1, a through hole 24 is formed that penetrates from the topsheet 21 to the absorber 20 in the thickness direction, and is made of a non-woven fabric or the like between the absorber 20 and the backsheet 22 and is in contact with the skin. Disclosed is an absorbent article 10 that has a diffusion layer 25 having an uneven structure formed on the contact surface, the diffusion layer 25 forms the bottom of the through hole 24, and the bottom is exposed on the skin contact surface side. .. According to the configuration disclosed in Patent Document 1, the highly viscous excrement diffuses in the in-plane direction in the diffusion layer 25 that has reached through the through hole 24.

JP, 2016-112232, A

However, in the configuration described in Patent Document 1, when the excrement has a higher viscosity or when the excrement is excreted in a large amount at one time, the diffusion in the diffusion layer does not proceed at a sufficient speed, May stay in the through hole and may overflow from the through hole in some cases. Therefore, the excrement may come into contact with the skin to cause discomfort to the wearer or cause a rash.

In view of the above points, it is an object to provide an absorbent article in which fluid excrement having a relatively high viscosity does not easily adhere to the skin.

A first aspect of the present invention includes a laminated body in which a back sheet, an absorber layer, and a surface sheet are laminated, and a through hole penetrating the laminated body has a position facing the wearer's anus when worn. It is formed within the included range.

According to the first aspect, the back sheet, the absorber layer, and the through hole penetrating the laminate formed by laminating the top sheet are formed in a range including the position facing the anus, The excrement can be dropped to the non-skin side (back side) of the laminate through the through holes. Thereby, for example, when another absorbent article (disposable diaper or the like) is attached to the non-skin side of the absorbent article, excrement can be dropped to the side of the other absorbent article.

Further, when the excreted matter is fluid and highly viscous, the excrement is partially absorbed by the other absorbent article but is not sufficiently absorbed and the surface of the other absorbent article is absorbed. It flows to the surroundings and spreads. When the excrement spread in such a wide range comes into contact with the wearer's skin, the wearer may experience discomfort or a rash. On the other hand, if the absorbent article according to the present embodiment is interposed, it is possible to prevent the excrement that has spread around the skin from directly contacting the skin. As a result, it is possible to prevent discomfort or a rash that may occur to the wearer.

In the second aspect of the present invention, the front edge of the through hole has a forward convex shape at the center in the width direction.

According to the second aspect, at the time of mounting, the absorbent article easily bends with the convex tip of the front edge of the through hole serving as a base point, and the width direction center of the front portion from the front end of the through hole is the skin direction. It can be raised (towards the front side of the laminate), creating a space between the laminate and another absorbent article attached to the non-skin side. This makes it possible to more effectively prevent the excretions once excreted from coming into contact with the skin in front of the anus.

In the third aspect, the rear edge of the through hole has a rearward convex shape at the center in the width direction.

According to the third aspect of the present invention, at the time of mounting, the absorbent article is bent with the convex tip of the rear edge of the through hole as a base point, and the widthwise center of the rear portion from the rear end of the through hole is skinned. Can be raised in a direction to create a space between the laminate and another absorbent article attached to the non-skin side. This makes it possible to more effectively prevent the excretions once excreted from coming into contact with the skin behind the anus.

In a fourth aspect of the present invention, an expansion/contraction mechanism is provided on the back surface side of the laminate along the width direction in front of and/or behind the through hole.

According to the fourth aspect, the expansion/contraction mechanism along the width direction contracts toward the center in the width direction on the back surface side of the stacked body at the position in front of and/or behind the through hole. As a result, the surface side of the laminated body is easily raised, and the above-described action of raising the portion from the front end to the front side of the through hole and/or the portion from the rear end to the rear side of the through hole in the skin direction can be further enhanced.

In a fifth aspect of the present invention, expansion/contraction mechanisms are provided along the front-rear direction on both sides of the back surface of the laminate.

According to the fifth aspect, the expansion/contraction mechanism along the front-rear direction contracts inward in the front-rear direction at both sides on the back surface side. As a result, the surface side of the laminated body is easily raised, and both sides of the through hole can be curved so as to be raised in the skin direction, and thus the region between the expansion and contraction mechanisms can be also curved so as to be raised in the skin direction. it can. Thereby, formation of the space between the laminated body and another absorbent article that is stacked on the non-skin side can be assisted.

In the sixth aspect of the present invention, the back sheet and the top sheet are liquid-permeable.

According to the sixth aspect, excrement having low viscosity such as urine can be absorbed by the absorbent body of the laminated body, and can also be absorbed and diffused into another absorbent article stacked on the non-skin side.

In the seventh aspect of the present invention, the laminated body includes a liquid-proof sheet on the back surface side, which extends rearward from a position facing the anus.

According to the seventh aspect, the liquid-proof sheet can prevent the excrement from returning to the skin direction through the laminated body in the region behind the position facing the anus. On the other hand, in a region in front of the position facing the anus, excrement having low viscosity such as urine can be absorbed and diffused into another absorbent article that is stacked on the back surface side of the laminate.

In the eighth aspect of the present invention, a porous pocket forming sheet is provided on the back surface side of the laminate so as to cover the through holes.

According to the eighth aspect, since the pocket-forming sheet is provided, the pocket can be formed on the back surface side of the laminate when worn, and the pocket is formed on the non-skin side through the through hole. It can accept the excreted waste. Even if a relatively large amount of excrement is excreted, it becomes difficult for the excrement to spread in the plane direction, and leakage can be prevented. In addition, since the pocket forming sheet is porous, excrement can be filtered and the liquid content can be absorbed by another absorbent article on the non-skin surface side. As a result, the fluidity of the excrement can be rapidly lost, so that the unabsorbed excrement can be prevented from flowing and leaking.

A ninth aspect of the present invention is an absorbent article that is used as an auxiliary pad by being stacked on the surface side of another absorbent article.

According to the ninth aspect, the main absorbent article is made more comfortable by using the absorbent article as a disposable auxiliary pad arranged on the surface side (inner side) of another main absorbent article such as a disposable diaper. Can be used for

According to one aspect of the present invention, it is possible to provide an absorbent article in which fluid excrement having a relatively high viscosity is unlikely to adhere to the skin.

1 is a plan view of an absorbent article according to an aspect of the present invention. It is the X1-X1 sectional view taken on the line of FIG. FIG. 2 is a sectional view taken along line X1′-X1′ of FIG. It is a perspective view showing the state where the absorptive article by one form of the present invention was attached to another disposable diaper as an auxiliary pad. It is an enlarged view of a through hole. It is a figure which shows the modification of a through-hole. It is a top view of the absorbent article by another form of the present invention. It is the X2-X2 sectional view taken on the line of FIG. 5A. It is sectional drawing corresponding to FIG. 5B(b) of the modification of the absorbent article by another form of this invention. It is a top view of the absorbent article by another form of the present invention. It is the X3-X3 sectional view taken on the line of FIG. 6A. It is a top view of the absorbent article by another form of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, the same or corresponding configurations are denoted by the same reference numerals and the description thereof may be omitted unless otherwise specified.

(Basic structure of absorbent article)
First, the basic structure of the absorbent article according to the embodiment of the present invention will be described. The absorbent article according to one aspect of the present invention can be suitably used as an auxiliary pad that is used by being stacked on the inside (skin side or surface side) of a disposable diaper, and therefore the absorbent article will be described based on an example of the auxiliary pad.

FIG. 1A shows a plan view of an absorbent article 100 according to one embodiment of the present invention as viewed from the skin side (front surface side). 1B shows a cross-sectional view taken along line X1-X1 of FIG. 1A, and FIG. 1C shows a cross-sectional view taken along line X1′-X1′ of FIG. 1A. As shown in FIGS. 1A to 1C, the absorbent article 100 has a laminated body S in which at least the back sheet 22, the absorber layer 30, and the top sheet 21 are laminated.

The form of the main disposable diaper to which the absorbent article 100 is applied as an auxiliary pad is not particularly limited, and may be a tape type, a pants type, a pad type or the like. The absorbent article 100 is attached to the inside (skin side) of such a main diaper, for example, on the surface sheet so as to correspond to the region corresponding to the crotch of the wearer, and is fixed with an adhesive tape or the like in some cases.

FIG. 2 shows a state in which the absorbent article 100, which is an auxiliary pad, is attached to the main disposable diaper 10 of the tape type as an example. As shown in FIG. 2, when the main disposable diaper 10 has gathers G, G standing on the skin side, the absorbent article 100 should be attached to the diaper 10 so as to be located between the gathers G, G. You can When the absorbent article 100 is attached to the main disposable diaper 10, the topsheet 21 of the absorbent article 100 comes into direct contact with the wearer's skin, while the backsheet 22 of the absorbent article 100 is the main disposable diaper 10. Of the top sheet of the sheet is overlapped.

Returning to FIG. 1A, the absorbent article 100 has a predetermined length in a first direction (front-back direction) D1 and a predetermined direction in a second direction (width direction) D2 orthogonal to the first direction D1 in plan view. Has a width of. In the configuration of FIG. 1A, the absorbent article 100 has a width that is shorter than its length. That is, the absorbent article 100 has an elongated rectangular shape in plan view as a whole. The front side and the rear side of the absorbent article 100 correspond to the abdomen side and the back side, respectively, when worn (in a state where the absorbent article 100 is worn).

The length (total length) of the absorbent article 100 in the front-rear direction D1 can be about 300 to 550 mm, and the length (width) in the width direction D2 can be about 150 to 300 mm. Although the width of the absorbent article 100 is constant over the front-rear direction D1, the width in the vicinity of the center in the front-rear direction D1 may be narrower than the front-rear region to be narrowed. The size and shape of the absorbent article 100 are preferably such that the main diaper to be stacked upon use does not stick out. Further, the shape of the absorbent article 100 can be line-symmetrical with the center line CL extending in the front-rear direction as a line of symmetry, but it is not necessarily required to be line-symmetrical. The configuration of the absorbent article 100 (size, shape, arrangement, etc. of each element such as the topsheet 21, the backsheet 22, and the absorber 30) may be line-symmetrical, but is similar to the shape of the absorbent article 100. , Need not be axisymmetric.

The absorbent article 100 is worn so as to correspond to the wearer's crotch area (at least a portion extending from the urine outlet to the anus) when worn. FIG. 1A shows a position (anus facing position) 48 that faces the wearer's anus when worn. In the illustrated form, the anus facing position 48 is located in a region behind the center of the absorbent article 100 when viewed in the front-rear direction D1, but the position of the anus facing position 48 in the front-rear direction D1 is the absorbent article. Depending on the overall length and shape of 100, the absorbent article 100 may be near the center of the front-rear direction D1 or may be located forward of the center of the front-rear direction D1.

The topsheet 21 and the backsheet 22 can have the same shape and size. In addition, the outer contours of the topsheet 21 and the backsheet 22 may be the same as the outer contours of the absorbent article 100 itself. Further, the outer shapes of the topsheet 21 and the backsheet 22 are larger than that of the absorber layer 30, and the topsheet 21 and the backsheet 22 are heat-sealed, ultrasonic-sealed, and bonded around the absorber layer 30. It is joined by a chemical agent.

Both the topsheet 21 and the backsheet 22 may be liquid-permeable. By making both the top sheet 21 and the back sheet 22 liquid-permeable, liquid excrement such as urine can pass from the front side to the back side, and is quickly absorbed by the main diaper (Fig. 2). It becomes possible. Therefore, the absorbent article 100 can be preferably used as an auxiliary pad. The liquid permeability of both sheets may be the same or different.

As the top sheet 21 and the back sheet 22, a perforated or non-perforated non-woven fabric, a perforated plastic sheet, or the like can be used. As the material fibers constituting the non-woven fabric, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and amides, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used.

In addition, it is preferable to use spunbonded nonwoven fabric as the material of the surface sheet 21. Further, as the material of the back sheet 22, it is preferable to use an air-through nonwoven fabric.

When the topsheet 21 and the backsheet 22 are made of the same material or have the same liquid permeability, the absorbent article 100 can be used with its front and back reversed. In that case, the back sheet 22 side is not provided with a member (described later) such as a liquid-proof sheet or a stretchable member.

The absorbent body layer 30 may be a laminated body of pulp fibers, an aggregate of filaments such as cellulose acetate, a non-woven fabric, or the like, and is formed by mixing and adhering particulate superabsorbent polymer as necessary. Can be used. In order to prevent the particles from spilling when the superabsorbent polymer particles are mixed, the absorbent layer is preferably wrapped with a packaging sheet such as a nonwoven fabric or crepe paper.

The absorber layer 30 may be composed of one layer or may be composed of a plurality of layers. When it is composed of a plurality of layers, each layer may be wrapped with a packaging sheet, or the packaging sheet may be sandwiched between layers. The packaging sheet may be uncolored (that is, white) or may be colored. The color can be a color that makes the color of the discharged body fluid inconspicuous, for example, a color close to the color of the body fluid, or a color complementary to or close to the color of the body fluid.

The fiber areal weight and the superabsorbent polymer areal weight in the absorber 30 can be appropriately determined, but the fiber areal weight is preferably about 100 to 700 g/m ^2, and the absorptive polymer has a basis weight of 50 to 550 g/m ^2. It is preferably about the same. Moreover, the total thickness of the absorber layer 30 can be 1 to 8 mm.

(Through hole)
As shown in FIGS. 1A and 1B, the absorbent article 100 has a through hole 40 penetrating the laminated body S in the thickness direction of the absorbent article 100. That is, holes are formed in all of the topsheet 21, the absorber layer 30, and the backsheet 22. As shown in FIG. 1A, the through hole 40 is provided over a range (region) including the anus facing position 48. Thereby, the excrement excreted from the wearer (for example, stool excreted from the anus) is passed through the through hole 40 to the back side of the laminate S, that is, the main diaper attached to the back side of the absorbent article 100. 10 (FIG. 2) side.

When the excrement is a fluid and viscous excrement such as loose stool, the excrement dropped on the main diaper is partially absorbed by the main diaper, but on the surface sheet of the main diaper. Remains, and flows and spreads while expanding the area to the surrounding area. Here, if the main diaper is directly applied to the wearer, the excrement can contact the skin in a large area. On the other hand, by using the absorbent article 100 according to the present embodiment, the absorbent article 100 can be interposed between the wearer's skin and the main diaper, so that the expanded excrement directly contacts the wearer's skin. You can avoid contact. More specifically, since the part of the laminated body S around the through hole 40 is interposed between the wearer's skin and the main diaper, the excrement dropped on the back surface side of the laminated body S is the main diaper. Even if it spreads above, the contact of excrement with the skin can be prevented, or the contact area between the excrement and the skin can be minimized.

As shown in FIG. 1A, the through hole 40 is formed so as to have a predetermined spread so as to include the anus facing position 48. In the illustrated form, the anus-facing position 48 is included in the area rearward from the center of the absorbent article 100 in the front-rear direction D1, so the through hole 40 is also mainly located in the area rearward of the center of the absorbent article 100 in the front-rear direction D1. Is formed in. However, the position of the through hole 40 in the absorbent article 100 may be formed near the center of the absorbent article 100 in the front-rear direction D1 depending on the position of the anus-facing position 48, or a region from the center of the front-rear direction D1 to the front. It may be formed in.

In order to describe the configuration of the through hole 40 in more detail, FIG. 3 shows an enlarged view of the through hole 40 and its periphery in the absorbent article 100 of FIG. 1A. In FIG. 3, a part of the configuration is omitted.

The through holes 40 allow the excrement to pass through in the thickness direction of the absorbent article 100, and even if the fluid excrement spreads slightly to the periphery when excreted from the anus, it does not easily adhere to the stack S. Shape and size. The maximum length L of the entire through hole 40 in the front-rear direction D1 can be about 50 to 200 mm, and the maximum length (maximum width) W of the entire through hole 40 in the width direction D2 is about 50 to 150 mm. be able to. Further, it is preferable that the through hole 40 has a line-symmetrical shape with the longitudinal centerline CL as the axis of symmetry. The value of the ratio of the maximum length L to the maximum width W is preferably 0.8 to 1.4, and more preferably 0.9 to 1.3.

For convenience of description, the through hole 40 can be divided into a front convex portion 41, an intermediate portion 42, and a rear convex portion 43 in plan view, as shown in FIG.

In the illustrated form, the intermediate portion 42 is a rectangle having long sides along the width direction D2. The lateral contour in the width direction D2 may be curved, and may be curved so as to bulge outward in the width direction D2, for example. The front end and the rear end of the intermediate portion 42 may extend linearly along the width direction D2.

As shown in FIG. 3, the anus-facing position 48 is preferably included in the intermediate portion 42. Since the front convex portion 41 and the rear convex portion 43 may be narrowed and closed at the time of mounting as described later, it is better that the anus facing position 48 is included in the intermediate portion 42 so that the excrement is more reliably discharged. It can be dropped to the back surface side of the absorbent article 100 (laminate S) through the through hole 40.

The length of the intermediate portion 42 in the front-rear direction D1 is preferably 20 to 55 mm, more preferably 25 to 45 mm. Further, the width w2 of the intermediate portion 42 (the maximum width when the width of the intermediate portion 42 is not constant in the front-rear direction D1) is equal to the maximum width W of the entire through hole 40, and can be about 50 to 150 mm. The width w2 of the intermediate portion 42 may be 65 to 85% of the width of the absorber layer 30.

The front convex portion 41 is a portion that projects forward from the front end of the intermediate portion 42. In the illustrated form, the shape of the front convex portion 41 is an isosceles triangle having a bottom side at the rear and a vertex facing the bottom side at the front on the longitudinal centerline CL. The rear end of the front convex portion 41 overlaps with the front end of the intermediate portion 42, but has a shorter length than the front end of the intermediate portion 42. That is, at the front end of the through hole 40, only a part in the width direction D2, specifically, the central portion in the width direction D2 is convex toward the front.

Since the absorbent article 100 is arranged mainly so as to correspond to the wearer's crotch portion when worn, it is deformed by receiving the force from both legs from the outside in the width direction D2 toward the center. In that case, the tip of the front edge of the through hole 40 (the apex of the convex of the front convex portion 41) is bent as a base point, and the tip of the front edge and the peripheral portion can be easily raised to the skin side. At this time, the absorbent article 100 rises so that the two sides extending from the front apex of the front convex portion 41 approach the front-rear direction center line CL.

As described above, since the front end of the through hole 40 and the periphery thereof can be raised to the skin side at the time of wearing, the absorbent article 100 and the back surface side thereof are overlapped at the center in the width direction D2 of the region in front of the through hole 40. A space can be formed between the main diaper 10 (FIG. 2) that has been created. Since excretions once excreted can be stored in such a space, direct contact of excrements with the skin in front of the anus can be more effectively prevented.

The maximum length (length on the front-rear direction center line CL) L1 of the front convex portion 41 is preferably 20 to 55 mm, and more preferably 30 to 40 mm. Further, the maximum width (width of the rear end of the front convex portion 41) w1 of the front convex portion 41 is preferably 10 to 55 mm, and more preferably 30 to 45 mm.

As shown in FIG. 3, the maximum width w1 of the front convex portion 41 is smaller than the width w2 of the intermediate portion 42 (width W of the through hole 40). As a result, a step portion is formed in front of the through hole 40, and a flap-like portion protruding obliquely rearward is formed by the stacked bodies S on both sides of the front convex portion 41. Generally, when the disposable diaper is worn, the skin in front of the anus easily adheres to the diaper, but the flap-like portion is formed in front of the through hole 40 as in the present embodiment, so that the anal region of the wearer's anus is prevented. The front skin can be well protected from excretions once excreted and spread in the surface direction. The maximum width W1 of the front convex portion 41 can be set to about 20 to 60% with respect to the width W2 of the intermediate portion 42 (width W of the through hole 40).

The angle α of the front vertex of the front convex portion 41 can be 30 to 100°. By setting the angle α in the above range, the laminated body around the front end of the through hole 40 and its periphery can be easily raised toward the skin side, and the raised state can be favorably maintained when the absorbent article 100 is mounted. it can.

In the illustrated embodiment, the front end of the front convex portion 41 is sharp, but it may be rounded. By rounding the tip of the absorbent article 100, the tip of the front convex portion 41 is deformed so as to be curved and bulges when the absorbent article 100 is attached, so that it is possible to reduce the discomfort caused by the tip hitting the skin.

The rear convex portion 43 is a portion that projects rearward from the rear end of the intermediate portion 42. As shown in FIG. 3, the shape of the rear convex portion 43 is an isosceles triangle having a bottom side in the front and a vertex facing the bottom side in the rear on the front-rear direction center line CL.

By having the rear convex portion 43, the shape of the rear edge of the through hole 40 is a rear convex shape at the center in the width direction D2. Therefore, when the absorbent article 100 receives a force from both legs at the time of wearing, the tip of the trailing edge of the through hole 40 (the apex of the convex of the trailing convex portion 43) bends, and the tip of the trailing edge and the periphery thereof. The part of can be easily raised to the skin side. At this time, the absorbent article 100 rises so that the two sides extending from the rear vertex of the rear convex portion 43 approach the front-rear centerline CL.

As described above, since the rear end of the through hole 40 and the periphery thereof can be raised to the skin side at the time of wearing, the absorbent article 100 and the back surface side thereof are located at the center in the width direction D2 of the region behind the through hole 40. A space can be formed between the stacked main diapers 10 (FIG. 2). Since the excretions once excreted can be stored in such a space, it is possible to more effectively prevent the excrements from directly contacting the skin behind the anus.

The maximum length (length on the front-rear direction center line CL) L3 of the rear convex portion 43 can be set to about 20 to 60 mm. By setting the maximum length of the rear convex portion 43 in the above range, the rear end of the through hole 40 and its periphery are easily raised to the skin side, and the raised state is good when the absorbent article 100 is mounted. Can be maintained.

The angle β of the apex behind the rear convex portion 43 is preferably 80 to 150°. By setting the angle β in the above range, the region behind the through-hole 40 can be deformed so as to follow the shape of the groove of the buttocks gradually increasing in the backward direction at the time of wearing, and the buttocks are attached to the excrement. Can be effectively protected from.

Further, in the illustrated form, the width of the front end of the rear convex portion 43 is equal to the width W2 of the intermediate portion 42. Accordingly, the rear convex portion 43 can be configured in a shape in which the width gradually decreases from the intermediate portion 42 toward the rear. Disposable diapers are often used when the wearer is lying in a supine position, and fluid excrements such as loose stools tend to move from the front to the rear. Therefore, the width of the front end of the rear convex portion 43 is set to be the same as the width W2 of the intermediate portion 42 in this way, and the rear portion of the through hole 40 is formed wider than the front portion. It is possible to prevent the absorbent article 100 (the laminated body S) around the periphery of the sheet from being easily attached.

In the illustrated embodiment, the rear end of the rear convex portion 43 is sharp, but it may be rounded like the front end of the front convex portion 41. With the rounded tip, the tip of the rear convex portion 43 is deformed so as to be curved and bulges when the absorbent article 100 is attached, so that it is possible to reduce discomfort caused by the tip hitting the skin.

FIG. 4 shows a modification of the through hole 40. The through hole 40a illustrated in FIG. 4A has a front convex portion 41a, an intermediate portion 42a, and a rear convex portion 43a, like the through hole 40, but of the front convex portion 41a and the rear convex portion 43a. The shape is different from that of the through hole 40. That is, although the shape of the front convex portion 41a is a substantially triangular shape, the two sides extending from the front apex are not straight lines but curved lines that bulge outward in the width direction D2. Further, the shape of the rear convex portion 43a is also a substantially triangular shape, but the two sides extending from the rear apex are not straight lines but curved lines that bulge outward in the width direction D2.

The through-hole 40b shown in FIG. 4B has a front convex portion 41b, an intermediate portion 42b, and a rear convex portion 43b, similarly to the through hole 40, but the front convex portion 41b and the rear convex portion 43b are different from each other. The shape is different from that of the through hole 40. That is, although the shape of the front convex portion 41b is a substantially triangular shape, the two sides extending from the front apex are not straight lines but curved lines that swell inward in the width direction D2. Further, the shape of the rear convex portion 43a is also a substantially triangular shape, but the two sides extending from the rear apex are not straight lines but curved lines that swell inward in the width direction D2.

The shapes of the front convex portion and the rear convex portion shown in FIG. 1A and FIGS. 4A and 4B can be combined with each other. For example, the shape of the front convex portion is an isosceles triangle having straight sides as shown in FIG. 1A, and the shape of the rear convex portion is a curve bulging outward in the width direction D2 as shown in FIG. 4A. The shape may be a substantially triangular shape having a curved side.

(Liquid-proof sheet)
As shown in FIGS. 1A and 1C, the absorbent article 100 may include a liquid-proof sheet 25 that is stacked on the back sheet 22 side. That is, the laminated body S may include the liquid-proof sheet 25. The liquid-proof sheet 25 may have the same shape as the back sheet 22 in the range where it is overlapped with the back sheet 22. That is, the through hole 40 may be provided so as to penetrate the topsheet 21, the absorber layer 30, the backsheet 22, and the liquid-proof sheet 25.

As the liquid-proof sheet 25, a polyolefin film such as polyethylene or polypropylene can be used. From the viewpoint of preventing stuffiness, a sheet having moisture permeability without impairing water impermeability can also be used. For example, it may be a microporous sheet obtained by melt-kneading an inorganic filler in a resin to form a sheet and then stretching the sheet in a uniaxial or biaxial direction.

By providing the liquid-proof sheet 25 on the back side of the back sheet 22, even if the excrement is dropped from the through-hole 40 into the diaper 10 (FIG. 2) and spreads in the surface direction, the excrement can be recovered again. It is possible to prevent the return to the skin side via the absorbent article 100.

In the illustrated form, the liquid-proof sheet 25 absorbs the middle portion 42 of the through hole 40 in the front-rear direction D1, specifically from the front end of the middle portion 42 to the rear end of the absorbent article 100, and in the width direction D2. It extends over the entire width of the sex article 100. The absorbent article 100 is often used in a state in which the wearer is lying down in the supine position, and excrement easily spreads rearward, but the liquid-proof sheet 25 is provided rearward from the intermediate portion 42 of the through hole 40. By doing so, it is possible to effectively prevent the return of excrement. Therefore, the front end of the liquid-proof sheet 25 is preferably positioned at least immediately behind the anus-facing position 48, and more preferably is located at a position beyond the anus-facing position 48 forward.

The liquid-proof sheet 25 is not provided from the rear end of the front convex portion 41 of the through hole 40 to the front end of the absorbent article 100. Thus, urine excreted from the urine outlet located in front of the wearer's anus can be transferred to the diaper 10 having a larger amount of absorbent body, which is stacked on the back surface side through the absorbent article 100. Therefore, from the viewpoint of preventing urine leakage, it is preferable that the front end of the liquid-proof sheet 25 does not exceed the front end of the through hole 40 as viewed in the front-rear direction D1.

(Form with expansion mechanism)
FIG. 5A shows an absorbent article 100A according to another embodiment of the present invention. The absorbent article 100A has the same basic configuration as the absorbent article 100 (FIG. 1A), but the width direction stretching mechanism capable of stretching in the width direction D2 on the back sheet 22 side and before and after the through hole 40, respectively. The absorbent article 100 differs from the absorbent article 100 in that it includes 51, 51.

The width direction expansion/contraction mechanisms 51, 51 are arranged on the back sheet 22 side. Further, the width-direction expansion/contraction mechanisms 51, 51 may include thread-shaped elastic members 51a, 51a extending in the width direction D2 so as to cross the front-rear direction center line CL and extending in the width direction D2. More specifically, the width direction expansion/contraction mechanism 51 is, for example, one in which the elastic member 51a is arranged in the stretched state on the back sheet 22 or the liquid-proof sheet 25 and is fastened so as to be covered with a band-shaped tape, or the elastic member 51a. It may be one in which two strip-shaped tapes are sandwiched from the front and back sides in the stretched state and adhered to the back sheet 22 or the liquid-proof sheet 25. At the time of mounting (in use), the elastic member 51a and the contraction mechanism 51 change from the expanded state to the unloaded contracted state.

The elastic member 51a may be manufactured from styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, or the like, which is formed into a thread shape, a string shape, a band shape, or the like. The expansion rate of the elastic member 51a, that is, the maximum length when expanded with respect to the natural length (the above-described contracted state) of 100% is preferably 240 to 290%, and more preferably 260 to 280%.

FIG. 5B shows a cross-sectional view taken along line X2-X2 in FIG. 5A, that is, a cross-sectional view cut in the width direction D2 at the position of the rear width-direction expansion/contraction mechanism 51. FIG. 5B(a) shows the stretched state of the widthwise stretching mechanism 51 in a state in which the absorbent article 100A is pulled to both sides in the widthwise direction D2, and FIG. 5B(b) shows that the force outward in the widthwise direction D2 is released. The contracted state of the width direction expansion-contraction mechanism 51 is shown.

As shown in FIG. 5B(a), both ends in the width direction D2 of the width direction expansion/contraction mechanism 51 are both end adhesive portions 51c and 51c, which are adhered to the liquid-proof sheet 25, but the central portion in the width direction D2 is the back surface. It is not adhered to the sheet 22. Therefore, as shown in FIG. 5B(b), when the expansion in the width direction expanding/contracting mechanism 51 to both sides in the width direction D2 is released, the adhesive portions 51c of the width direction expanding/contracting mechanism 51 approach each other in the front-rear direction D1 center. Become. As a result, a force is applied to the stack S in a direction that shrinks in the width direction D2, so that the central portion of the stack S that is not bonded to the width-direction stretching mechanism 51 can be easily raised in the skin direction.

According to the present embodiment, as described above, in the portion of the laminated body S from the front end of the through hole 40 to the front side, the front end of the through hole 40 serves as a base point in the skin direction (toward the surface side of the laminated body). Although it can be raised, such an action can be further enhanced by the presence of the front widthwise expansion/contraction mechanism 51. Further, the rear widthwise expansion/contraction mechanism 51 further enhances the action of causing the rear end of the through hole 40 of the laminated body S to be raised in the skin direction with the rear end of the through hole 40 as a base point.

Although the cross-section of the front widthwise expansion/contraction mechanism 51 is not shown, the front widthwise expansion/contraction mechanism 51 is directly bonded to the back sheet 22 instead of the liquid-proof sheet 25.

It is preferable that both the front and rear widthwise expansion/contraction mechanisms 51, 51 do not overlap the through hole 40 in a plan view so as not to obstruct the excrement when it is dropped on the back surface side of the absorbent article 100. For example, it is preferable that the width-direction expansion/contraction mechanisms 51, 51 are provided at a distance of about 5 to 25 mm from the front edge of the through-hole 40 to the front side or the rear edge to the rear side in plan view.

Further, in the illustrated embodiment, the width direction expansion/contraction mechanisms 51, 51 are provided both before and after the through hole 40, but may be provided at either the front or the rear of the through hole.

FIG. 5C shows a modified example of the absorbent article 100A (FIG. 5B(b)) including the width-direction stretching mechanisms 51, 51. FIG. 5C shows a contracted state of the width-direction expansion/contraction mechanisms 51, 51 (corresponding to FIG. 5B(b)). In the example of FIG. 5C, the entire width direction expansion/contraction mechanism 51 is configured to be bonded to the liquid-proof sheet 25 along the width direction D2. In this example, when the widthwise expansion/contraction mechanism 51 is in a contracted state, a fold is formed at the backsheet 22 side of the laminated body S, that is, a part of the absorber layer 30, the backsheet 22, and the liquid-proof sheet 25 at the center in the width direction D2. The laminated body portion that is formed and includes the topsheet 21, the absorber layer 30, and the backsheet 22 rises in the skin direction.

FIG. 6A shows an absorbent article 100B according to another embodiment of the present invention. Further, FIG. 6B shows a cross-sectional view taken along line X3-X3 of FIG. 6A. As shown in FIGS. 6A and 6B, an absorbent article 100B is provided with front-rear direction expansion/contraction mechanisms 52, 52 that are expandable/contractible in the front-rear direction D1 in addition to the configuration of the absorbent article 100 (FIG. 1A). ..

As shown in FIGS. 6A and 6B, the front-rear direction expansion/contraction mechanism 52, 52 includes elastic members 52a, 52a, and can be configured as a belt-shaped sheet extending from the front end to the rear end on both sides of the absorbent article 100B. .. The front-rear direction expansion/contraction mechanism 52, 52 may be provided by extending the elastic member 52a in the front-rear direction D1 in an expanded state. For example, the elastic member 52a is sandwiched between two strip-shaped sheets in an expanded state. Can be A front end and a rear end of the front-rear direction expansion/contraction mechanism 52, and a side end outside the width direction D2 are bonded to the back sheet 22 or the liquid-proof sheet 25 with an adhesive or the like, and at least an area including the elastic members 52a and 52a is bonded. It is not done and is free (Fig. 6B). The front-rear direction expansion/contraction mechanism 52 is different in that it is provided on the back sheet 22 side, but the front-rear direction expansion/contraction mechanisms 52, 52 have the same configuration and arrangement as a side-leakage prevention gather sheet known in the art. You can

The elastic member 52a can be made of the same material as the elastic member 51a described above. It is preferable that the elastic members 52a, 52a extend so as to include at least the through hole 40 in the front-rear direction D1 in a plan view. That is, it is preferable that the front end of the elastic member 52a extends forward beyond the front end of the through hole 40, and the rear end of the elastic member 52a extends rearward beyond the rear end of the through hole 40.

When used, the front-rear direction expansion/contraction mechanisms 52, 52 are released from the extended state and are in a contracted state, so that gathers are formed. Thereby, the laminated body S can be curved so as to bulge in the skin direction. Therefore, in the region where the through hole 40 is formed, it becomes easier to form a space between the absorbent article 100B and the main diaper stacked on the back surface side thereof. In addition, the absorbent article 100B easily adheres to the skin, and the skin can be reliably protected from contact with excrement.

Further, even when a relatively large amount of excrement is excreted on the back surface side of the stack S and spreads in the lateral direction D2, the front-rear direction expansion/contraction mechanisms 52, 52 prevent the excrement from moving outward in the lateral direction D2. Therefore, it is possible to prevent side leakage around the legs.

The width direction expansion/contraction mechanism 51, 51 (FIGS. 5A and 5B) and the front/rear direction expansion/contraction mechanism 52, 52 (FIG. 6) can be combined. In this case, for example, the front and/or rear width direction expansion/contraction mechanism 51 and front/rear direction expansion/contraction mechanisms 52, 52 may be combined. By providing the width direction expansion/contraction mechanism 51 and the front/rear direction D1 expansion/contraction mechanism 52, the through hole 40 and the area around it can be curved in the front/rear direction D1 and the width direction D2, and the skin becomes dome-shaped. It can be easily piled up in any direction. This facilitates forming a space between the absorbent article and the main diaper. Therefore, even if the excrement spreads in the surface direction on the main diaper after the excrement is discharged, the excrement is more difficult to adhere to the wearer's skin.

(Pocket forming sheet)
FIG. 7 shows an absorbent article 100C according to another embodiment of the present invention. The absorbent article 100C has the same basic configuration as the absorbent article 100 (FIG. 1A), but differs from the absorbent article 100 in that the pocket forming sheet 28 is provided on the back sheet 22 side.

As shown in FIG. 7, the pocket forming sheet 28 may be provided in a range that covers the through hole 40. Therefore, in the illustrated embodiment, the pocket forming sheet 28 has a rectangular shape, but may have a shape along the contour of the through hole 40 in plan view.

The pocket forming sheet 28 is provided on the back sheet 22 side (joined to the back sheet 22 and, in some cases, the back sheet 22 and the liquid-proof sheet 25) so that the pocket is formed on the back side when in use. can do. Since this pocket can receive the excrement that has passed through the through hole 40, even if a relatively large amount of excrement is excreted, it is difficult to spread in the plane direction from the excreted position, and thus side leakage is prevented. be able to.

The pocket forming sheet 28 is preferably porous and can be formed of a relatively low density, for example, a non-woven fabric having a lower density than the top sheet 21 and the back sheet 22. As a result, the excrement dropped on the pocket forming sheet 28 can be filtered, and the liquid content can be absorbed by the main diaper (FIG. 2) provided on the back surface side. Therefore, even if the excrement contains a large amount of water, the fluidity of the excrement can be promptly lost, and the excrement can be prevented from flowing and leaking from the excreted position to the surroundings.

As shown in FIG. 7, both ends of the pocket forming sheet 28 in the width direction D2 are joined to the back sheet 22 and the liquid-proof sheet 25 in a state in which a plurality of folds (tucks) are moved in the front-rear direction D1. Is preferred. Accordingly, since the pocket forming sheet 28 can swell like a bag when the absorbent article 100C is used, a relatively large amount of excrement can be received.

21 Top Sheet 22 Back Sheet 25 Liquidproof Sheet 28 Pocket Forming Sheet 30 Absorber Layer 40 Through Hole
41 Front convex part 42 Intermediate part 43 Rear convex part 48 Anus facing position 51 Width direction expansion-contraction mechanism 52 Front-back direction expansion-contraction mechanism 51a, 52a Elastic member 51c End part adhesion part 100, 100A, 100B, 100C Absorbent article CL Front-rear direction center line (Center line along the first direction D1)
D1 longitudinal direction (first direction)
D2 width direction (second direction)
L Length of through hole L1 Maximum length of front convex portion 41 L2 Length of intermediate portion L3 Maximum length of rear convex portion S Stacked body W Width of through hole W1 Maximum width of front convex portion 41 W2 Middle portion width

Claims (9)

A back sheet, an absorber layer, and a laminate formed by laminating a top sheet,
The absorbent article, wherein a through-hole penetrating the laminated body is formed in a range including a position facing the anus of the wearer at the time of wearing. The absorbent article according to claim 1, wherein a front edge of the through hole has a forward convex shape in the center in the width direction. The absorbent article according to claim 1 or 2, wherein a rear edge of the through hole has a rearward convex shape at the center in the width direction. The absorbent article according to any one of claims 1 to 3, wherein a stretching mechanism is provided on the back surface side of the laminate along the width direction in front of and/or behind the through hole. The absorbent article according to any one of claims 1 to 4, wherein expansion and contraction mechanisms are provided along the front-rear direction on both sides of the back surface of the laminate. The absorbent article according to claim 1, wherein the back sheet and the top sheet are liquid-permeable. The absorbent article according to any one of claims 1 to 6, wherein the laminated body includes a liquid-proof sheet on a back surface side that extends rearward from a position facing the anus. The absorbent article according to any one of claims 1 to 7, wherein a porous pocket-forming sheet is provided on the back surface side of the laminated body so as to cover the through holes. The absorbent article according to any one of claims 1 to 8, which is used as an auxiliary pad by being stacked on the front surface side of another absorbent article.

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