WO2020059507A1

WO2020059507A1 - Absorbent article

Info

Publication number: WO2020059507A1
Application number: PCT/JP2019/034891
Authority: WO
Inventors: 了一山本; 美奈富田; 拓也幸田
Original assignee: 花王株式会社
Priority date: 2018-09-19
Filing date: 2019-09-05
Publication date: 2020-03-26
Also published as: RU2765143C1; GB2593298B; GB202103113D0; GB2593298A

Abstract

An absorbent article (1) according to the present invention is provided with: a front surface sheet (2) with an uneven structure having a plurality of protrusions (24) and recesses; and a rear surface sheet (3). End flap parts (1E) in end regions in the longitudinal direction (X) are each configured from at least the front surface sheet (2) and the rear surface sheet (3). In at least one of the end regions, the protrusions (24) on the front surface sheet (2) among the sheet members that configure the end flap parts (1E), protrude from an edge (e1) of the rear surface sheet toward the outside in the longitudinal direction (X).

Description

Absorbent articles

The present invention relates to an absorbent article.

技術 A technique for improving the wearing feeling of an absorbent article by treating the longitudinal edge of the absorbent article is known. For example, the present applicant has previously described an absorbent sheet in which, at each of the front and rear ends in the longitudinal direction, the topsheet has an extended portion that extends outside any edge of the absorber and the backsheet. An article was proposed (see Patent Document 1). According to this absorbent article, during wearing, there is an advantage that it is possible to reduce discomfort and discomfort caused by the front and rear ends of the absorbent article hitting the skin.

Patent Literature 2 discloses that a liquid-permeable topsheet and a backsheet extend outside the longitudinal edge of the absorber, and the liquid-permeable topsheet is attached to the front and rear ends of the absorbent body, respectively. An absorbent article provided with an outer extension portion extending more outward is disclosed. According to this document, the absorbent article has a structure in which the end of the back sheet does not directly contact the skin, thereby reducing discomfort when worn.

JP 2009-100878 A JP 2013-154016 A

The present invention is an absorbent article including a surface sheet having an uneven structure having a plurality of convex portions and concave portions, and a back sheet, and having a longitudinal direction corresponding to a wearer's longitudinal direction and a width direction orthogonal to the longitudinal direction. . The end portion in the longitudinal direction is constituted by at least the top sheet and the back sheet. In at least one of the end regions, the protrusions on the topsheet extend outward in the longitudinal direction from the edge of the backsheet.

FIG. 1 is a partially cutaway plan view schematically showing a deployable disposable diaper which is one embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view in the thickness direction of the edge of the end flap portion shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 is a partially broken plan view schematically showing a state in which a deployable disposable diaper according to another embodiment of the present invention is viewed from the non-skin contact surface side. FIG. 6 is a sectional view in the thickness direction of the edge of the end flap portion shown in FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view schematically illustrating a state in which the end flap portion of the disposable diaper according to still another embodiment of the present invention is cut along the diaper longitudinal direction.

Detailed description of the invention

In order to wear the absorbent article more comfortably, it is required to further reduce discomfort and discomfort caused by the edge of the article hitting the skin.

Therefore, the present invention relates to an absorbent article that does not easily give a feeling of discomfort or discomfort even when the edge of the end area of the absorbent article comes into contact with the skin.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 shows a schematic configuration of a deployable disposable diaper which is an embodiment of the absorbent article of the present invention. The diaper 1 shown in FIG. 1 has a vertically long shape having a longitudinal direction X corresponding to a direction extending from the wearer's abdomen to the dorsal side via the crotch portion and a width direction Y perpendicular to the longitudinal direction. The diaper 1 has a dorsal region 1A arranged on the back of the wearer, an abdominal region (not shown) arranged on the abdomen of the wearer, and a crotch region 1B located therebetween. The crotch region 1 B has an excretion portion facing portion that is disposed to face the excretion portion of the wearer when the diaper 1 is worn.

As shown in FIG. 1, the diaper 1 has both side edges in the width direction Y of the back side region 1A and both side edges in the width direction Y of the abdominal region (not shown) more than both side edges in the width direction Y of the crotch region 1B. Also extend outward in the width direction Y. Both side edges in the width direction Y of the crotch region 1B are curved in an arc shape inward in the width direction Y, and have a shape in which a central region in the longitudinal direction X is constricted inward as a whole.

As shown in FIG. 1, the diaper 1 includes a liquid-retentive absorbent body 4 long in the longitudinal direction X, a surface sheet 2 disposed on the skin-contacting surface of the absorbent body 4, and a non-skin-absorbing body of the absorbent body 4. And a back sheet 3 disposed on the contact surface. The top sheet 2 and the back sheet 3 respectively extend outward from both side edges in the width direction Y and both end edges in the longitudinal direction X of the absorber 4. The top sheet 2 and the back sheet 3 are joined to each other at an extending portion extending outward from the peripheral edge of the absorber 4, and hold and fix the absorber 4. On each of the left and right sides along the longitudinal direction X of the topsheet 2, side sheets 5 forming a leak-proof cuff on the skin contact surface of the topsheet 2 are arranged and fixed.

In the present specification, the skin contact surface is a surface that is directed to the wearer's skin side when the absorbent article is worn, that is, a side relatively closer to the wearer's skin, and the non-skin contact surface is an absorbent surface. The surface facing the skin side when the sexual article is worn, that is, the surface relatively far from the wearer's skin.

As shown in FIG. 1, the diaper 1 is disposed at both end regions in the longitudinal direction X located in the dorsal region 1 A and the abdominal region (not shown) outside the longitudinal edges of the absorber 4 in the longitudinal direction X. It has an extended end flap portion 1E. The end flap portion 1E is a horizontally long region extending along the width direction Y. The end flap portion 1E is composed of a plurality of sheet materials including a top sheet 2 and a back sheet 3. For example, the end flap portion 1E includes a top sheet 2, a back sheet 3, and a side sheet 5.

FIGS. 1 to 4 show an example of the topsheet 2 used in the present embodiment. The topsheet 2 shown in these figures has a concavo-convex structure having a plurality of convex portions projecting toward the wearer's skin side when worn, and concave portions arranged between the convex portions. The topsheet 2 has a laminated structure in which an upper nonwoven fabric 21 located on the skin side of the wearer and a lower nonwoven fabric 22 located farther from the skin of the wearer are joined to each other at a plurality of joints 23. The upper nonwoven fabric 21 has a large number of projections 24 protruding away from the lower nonwoven fabric 22 at portions other than the joint 23. The joint portion 23 located between the adjacent convex portions 24 forms the bottom of the concave portion of the topsheet 2 having the uneven structure. As a result, an uneven structure is formed in the upper nonwoven fabric 21 that forms the skin contact surface of the topsheet 2.

On the other hand, the lower nonwoven fabric 22 in the topsheet 2 has a substantially flat shape as shown in FIGS. This contributes to preventing the thickness of the diaper 1 from becoming excessively large while maintaining the cushioning properties of the topsheet 2. In the longitudinal direction X of the lower nonwoven fabric 22, the position of the edge 22e constitutes the end flap portion 1E of the back region 1A and the abdomen region (not shown), as shown in FIGS. Of the sheet material, it matches the position of the edge e1 of the back sheet 3 in the longitudinal direction X. The edge e1 is the same as the edge sheet of the back sheet 3 and the side sheet 5 even when the edge positions of the back sheet 3 and the side sheet 5 do not match. 3 refers to the edge.

In the upper nonwoven fabric 21 of the topsheet 2, as shown in FIG. 1, the protrusions 24 formed on the upper nonwoven fabric 21 are formed by the edge e 1 of the backsheet 3 in the back region 1 A and the abdominal region (not shown). From the outside in the longitudinal direction X. Accordingly, focusing on the end flap portion 1E of the diaper 1, the upper nonwoven fabric 21 of the topsheet 2 is located at the outermost side in the longitudinal direction X among the sheet materials constituting the end region. By adopting such a configuration, even if the end flap portion 1E comes into contact with the skin while wearing the diaper 1 of the present embodiment, the convex portion 24 extending from the edge e1 serves as a cushion, and It is difficult to give a sense of discomfort or discomfort due to this.

As shown in FIGS. 2 to 4, the convex portion 24 protrudes so that the upper nonwoven fabric 21 is separated from the lower nonwoven fabric 22 at a portion other than the joining portion 23, thereby forming a space between the upper nonwoven fabric 21 and the lower nonwoven fabric 22. Is formed. In addition, as shown in FIG. 2, in the back edge region 1 A and the abdominal region (not shown), when the edge e 1 is viewed along the width direction, the space of the protrusion 24 is visible. It has become. That is, the topsheet 2 has a hollow structure having a space inside the projection 24. Due to this, the topsheet 2 has a high air permeability and a high cushioning property against the skin.

(2) As shown in FIG. 2, the topsheet 2 includes a central region 2C and a pair of

side regions

2S, 2S located on both sides of the central region 2C. The central region 2C is located at a central portion of the diaper 1 in the width direction Y and extends along the longitudinal direction X of the diaper 1. Each

side area

2S, 2S is adjacent to the center area 2C and extends along the longitudinal direction X of the diaper 1. The side area 2S is formed at a position overlapping the side seat 5 as shown in FIG.

As shown in FIG. 1, the convex portion 24 includes a plurality of first convex portions 41 disposed in the central region 2C and a plurality of second convex portions 42 disposed in the side region 2S. The first convex portion 41 and the second convex portion 42 may have the same height or different heights. When the heights are different, it is preferable that the first protrusion 41 is higher than the second protrusion 42. By doing so, it is easy to make the amount of extension of the first convex portion 41 outward in the longitudinal direction X larger than the amount of extension of the second convex portion 42 outward in the longitudinal direction X. As a result, the cushioning property in the wearer's abdominal region, in which the friction is likely to increase due to the wearer's abdominal girth occurring while wearing the diaper 1, is further improved. Also in the back side region 1A, uncomfortable feeling and discomfort when the end flap portion 1E comes into contact with the wearer's skin are further reduced. In the present embodiment, it is particularly preferable that the protrusion 24 extends from the entire area of the edge e1 from the viewpoint of not giving uncomfortable feeling or discomfort when contacting the skin of the wearer. It is not necessary that the protruding portion 24 extends from.

As shown in FIGS. 3 and 4, when the first convex portion 41 and the second convex portion 42 are compared, the area of the space of the first convex portion 41 is larger than the area of the space of the second convex portion 42. I have. The area of the space is an area when the edge e1 of the back sheet 3 in the back region 1A and the abdomen region (not shown) is viewed in cross section along the width direction. With this configuration, the cushioning property in the wearer's abdominal region, in which the friction is likely to increase due to the wearer's abdominal girth that occurs while wearing the diaper 1, is further improved. Also in the back side region 1A, uncomfortable feeling and discomfort when the end flap portion 1E comes into contact with the wearer's skin are further reduced.

From the viewpoint of further exerting the advantageous effects of the present invention described above, the ratio of the height L1 of the first protrusion 41 (see FIG. 3) to the height L2 of the second protrusion 42 (see FIG. 4). Is preferably 0.2 or more, more preferably 0.5 or more, and preferably less than 1.0, and more preferably 0.8 or less. The height L1 of the first convex portion 41 itself is preferably 0.7 mm or more, more preferably 1.0 mm or more, and preferably 3.0 mm or less, more preferably 2.0 mm or less. On the other hand, the height L2 of the second convex portion 42 itself is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 2.0 mm or less, more preferably 1.5 mm or less. The heights of the

convex portions

41 and 42 are measured by a method described below.

<Method of measuring the height of the

convex portions

41 and 42 of the topsheet 2>
The topsheet 2 to be measured is cut with a sharp razor along its width direction. Thereafter, the cut surface is observed, and the height at the apex of the convex portion 24 on the skin contact surface of the topsheet 2 under no load is measured. The means for observing the cut surface of the topsheet 2 is not particularly limited, and may be the naked eye or an optical microscope. When an optical microscope is used, observation can be performed at a magnification of 20 to 100 times using, for example, a microscope (VHX-100 manufactured by KEYECE).

From the viewpoint of improving the feel of the top sheet 2 in the wearer, in plan view, the area of each first convex portion 41, is preferably 5 mm ² or more, more preferably 10 mm ² or more and, preferably 30 mm ² Or less, more preferably 25 mm ² or less. On the other hand, the area of each of the second convex portions 42 is preferably 1 mm ² or more, more preferably 3 mm ² or more, and is preferably 20 mm ² or less, more preferably 10 mm ² or less.

From the same viewpoint, the first convex portion 41 preferably extends from the edge e1 by 2 mm or more, more preferably extends by 3 mm or more, and preferably extends by 10 mm or less, More preferably, the extension is 5 mm or less. Further, the second convex portion 42 preferably extends from the edge e1 by 1 mm or more, more preferably extends by 2 mm or more, and preferably extends by 5 mm or less, and preferably extends by 3 mm or less. It is more preferable that it is provided. The lengths of the protruding

portions

41 and 42 are measured by the following method.

<Method of measuring the length of the protruding portion 24>
The end regions in the back region 1A and the ventral region (not shown) are cut with a sharp razor along the longitudinal direction of the absorbent article. The cut surface is observed, and the length of the protruding portion 24 extending from the edge e1 is measured under no load. The cut surface is observed using an optical microscope. As the optical microscope, for example, VHX-100 manufactured by KEYECE can be used. The measurement magnification is 20 to 100 times.

表面 The topsheet 2 having the above configuration can be manufactured using, for example, the apparatus shown in FIG. 2 of JP-A-2005-111908. In this device, a first roll and a second roll whose peripheral surfaces are in mesh with each other are arranged in a meshing state. Furthermore, the device has an anvil roll arranged to abut the peripheral surface of the first roll. Using this apparatus, the belt-shaped upper nonwoven fabric 21 is supplied between the first roll and the second roll to deform the upper nonwoven fabric 21 into an uneven shape. In this case, the upper nonwoven fabric 21 is supplied at a higher speed than the lower nonwoven fabric 22 in view of the fact that the upper nonwoven fabric 21 is deformed into an uneven shape and the length is shortened from the viewpoint of forming the convex portion 24 having rich cushioning properties. Is preferred. Thereafter, the upper nonwoven fabric 21 is moved from the meshing portion along the peripheral surface portion of the first roll, and then the lower nonwoven fabric 22 is supplied so as to overlap the belt-shaped lower nonwoven fabric 22 with the upper nonwoven fabric 21 having irregularities. A pressure is applied under heating between the convex portion of the roll and the heat roll. With this pinching pressure, the upper nonwoven fabric 21 and the lower nonwoven fabric 22 are partially joined, whereby the topsheet 2 is obtained. In the topsheet 2 obtained in this manner, the upper nonwoven fabric 21 and the lower nonwoven fabric 22 are conveyed before joining because the supply amount of the upper nonwoven fabric 21 is larger than the supply amount of the lower nonwoven fabric 22. The length along the direction is longer in the upper nonwoven fabric 21 than in the lower nonwoven fabric 22. When the convex portion 24 has the first convex portion 41 and the second convex portion 42, the first roll and the second roll are formed at the central portion and the side portion in the width direction of the upper nonwoven fabric 21 when deforming into an uneven shape. It can be formed by differentiating the concavo-convex shape of the roll and the pattern of the joint formed by the first roll and the heat roll.

The diaper 1 described above can be manufactured using a so-called vertical flow type disposable diaper manufacturing apparatus. Specifically, the absorber 4 is intermittently arranged along the transport direction on the belt-shaped back sheet 3 transported in one direction. The strip-shaped top sheet 2 conveyed in the same direction as the back sheet 3 is supplied on the back sheet 3 on which the absorber 4 is arranged so as to overlap. The belt-shaped topsheet 2 has an uneven structure on one surface, and is arranged on the absorber 4 such that the surface having the uneven structure faces the opposite side to the absorber 4. The continuous body of the diaper 1 is formed by fixing the overlapped top sheet 2 and the absorber 4, between the absorber 4 and the back sheet 3, and between the top sheet 2 and the back sheet 3. When the diaper 1 is provided with a leak-proof cuff, it is preferable to fix the band-shaped

side sheets

5 and 5 on both sides of the top sheet 2 before overlapping the top sheet 2 on the back sheet 3. Then, using a known cutting means, the continuous body of the diaper 1 is cut across the width direction between the absorbers 4 adjacent to each other in the transport direction so as to have a desired size of the diaper 1. Thereby, the desired diaper 1 is manufactured. When cutting the continuous body of the diaper 1, it is preferable that the tension applied to the continuous body in the transport direction be higher than usual. Further, the cutting position of the continuous body of the diaper 1 is preferably at a joining portion between the upper nonwoven fabric 21 and the lower nonwoven fabric 22 in the topsheet 2. By performing cutting under such conditions, the convex portion of the topsheet 2 can be easily extended outward from the edge e1 of the end flap portion 1E. In addition, since the length of the upper nonwoven fabric 21 is set to be longer than that of the lower nonwoven fabric 22 in anticipation that the upper nonwoven fabric 21 is deformed into an uneven shape as described above, the upper nonwoven fabric 21 is transported more continuously than usual when the continuous body of the diaper 1 is transported. Even if a high tension is applied, the protrusions 24 formed on the upper nonwoven fabric 21 are less likely to be crushed. As a result, it is possible to secure a sufficient amount of extension of the protrusion 24.

Examples of the upper nonwoven fabric 21 and the lower nonwoven fabric 22 constituting the topsheet 2 of the diaper 1 include an air-through nonwoven fabric, a spunbonded nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a resin-bonded nonwoven fabric, and a needle-punched nonwoven fabric. A laminate in which two or more of these nonwoven fabrics are combined or a laminate in which these nonwoven fabrics are combined with a film or the like can also be used. Among these, it is preferable to use an air-through nonwoven fabric or a spunbonded nonwoven fabric. The basis weight of the nonwoven fabric is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, and preferably 40 g / m ² or less, more preferably 35 g / m ² or less. The types of the nonwoven fabrics constituting the upper nonwoven fabric 21 and the lower nonwoven fabric 22 may be the same or different.

As the back sheet 3 and the side sheet 5, for example, a liquid-impermeable film, a spunbonded / meltblown / spunbonded laminated nonwoven fabric, or the like can be used. The absorber 4 has an absorbent core. The absorbent core is, for example, a pile of a hydrophilic fiber such as cellulose such as pulp, a pile of a mixture of the hydrophilic fiber and an absorbent polymer, a pile of an absorbent polymer, and a sheet between two absorbent sheets. And a laminated structure in which an absorbent polymer is supported. The absorbent core may have at least the skin contact surface covered with a liquid permeable core wrap sheet, or the entire surface including the skin contact surface and the non-skin contact surface is covered with the core wrap sheet. May be. As the core wrap sheet, for example, a thin paper made of hydrophilic fibers, a liquid-permeable nonwoven fabric, or the like can be used.

Next, the present invention will be described based on another preferred embodiment with reference to the drawings. FIG. 5 shows a schematic configuration of a deployable disposable diaper according to another embodiment. In the diaper 1 shown in FIG. 1, the back sheet 3 has a laminated structure including a first sheet 31 having poor liquid permeability and a second sheet 32 disposed on the non-skin contact surface of the first sheet 31. ing.

The first sheet 31 has a substantially flat shape as shown in FIGS. As the first sheet 31, a liquid-impermeable film or the like can be used. As the second sheet 32, a nonwoven fabric such as an air-through nonwoven fabric and a spunbonded nonwoven fabric can be used.

5) The second sheet 32 has an uneven structure having a plurality of second convex portions 33 and second concave portions 34, as shown in FIGS. In the embodiment shown in FIGS. 5 and 6, the second convex portion 33 has a ridge shape protruding outward from the non-skin contact surface of the first sheet 31 and extending in the longitudinal direction X. A region defined by the first sheet 31 and the second sheet 32 in the second convex portion 33 is hollow. The second concave portion 34 is formed between the ridge-shaped second convex portions 33 adjacent to each other in the width direction Y and extends in the longitudinal direction X. As a result, the second sheet 32 has a ridge groove shape. The second sheet 32 is bonded to the first sheet 31 via an adhesive (not shown) at a portion where the groove-shaped second concave portion 34 is disposed.

In the diaper 1 shown in FIGS. 5 to 7, the end flaps 1E at both end portions in the longitudinal direction X located in the dorsal region 1A and the abdominal region (not shown) include the top sheet 2, the back sheet 3, and the side sheets. The seat 5 is configured. In the diaper 1 shown in the figure, the position of the longitudinal edge X1 of the first sheet 31 on the back sheet 3 coincides with the position of the edge of the side sheet 5 and the top sheet 2. In the diaper 1 shown in the figure, the edge e1 is the first edge regardless of whether the edge positions of the first sheet 31, the top sheet 2, and the side sheet 5 are coincident with each other. Refers to the edge of the sheet 31.

In the diaper 1 shown in FIGS. 5 to 7, as shown in FIG. 7, the second protrusions 33 of the second sheet 32 of the back sheet 3 are connected to the first area 1A in the back area 1A and the first area in the abdominal area (not shown). The sheet 31 extends outward from the edge e1 of the sheet 31 in the longitudinal direction X. Accordingly, focusing on the end flap portion 1E of the diaper 1, the second sheet 32 is located at the outermost side in the longitudinal direction X among the sheet materials constituting the end area. By adopting such a configuration, the diaper 1 shown in the figure has a cushion in which the second convex portion 33 extending from the edge e1 becomes a cushion even if the end flap portion 1E comes into contact with the skin during the wearing. It is difficult to give a sense of discomfort or discomfort caused by the contact.

From the viewpoint of further exerting the above-described effects, the height of the second protrusion 33 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and preferably 3 mm or less, more preferably 2 mm or less. It is as follows. The height of the second projection 33 is measured in the same manner as the height of the

projections

41 and 42 described above. From the same viewpoint, the second convex portion 33 preferably extends from the edge e1 by 1 mm or more, more preferably extends by 3 mm or more, and preferably extends by 10 mm or less. More preferably, the extension is 5 mm or less. The length of the extended portion of the second convex portion 33 is measured by the same method as the length of the extended portions of the

convex portions

41 and 42 described above.

The above-described ridge groove shape of the second sheet 32 is, for example, a band-like and multiple-layer adhesive applied to one surface of one sheet to which tension is applied, and then the other sheet to which higher tension is applied than the one sheet. The sheet is formed by laminating the adhesive-coated surface of the one sheet to form a bonded sheet, and then lowering the tension applied to the bonded sheet to be lower than the tension applied to the other sheet. can do.

The first sheet 31 and the second sheet 32 constituting the diaper 1 will be described in detail by way of example. First, the first sheet 31 and the second sheet 32 are extended in the transport direction of the second sheet 32 with respect to one surface of the long strip-shaped second sheet 32. Then, a plurality of strips of the adhesive are preferably applied so as to extend in the direction along the transport direction of the second sheet 32. That is, the application portion (joining area) to which the adhesive has adhered and the non-application portion to which the adhesive has not adhered to the second sheet 32 are preferably arranged in a direction intersecting the transport direction of the second sheet 32. The second sheets 32 are formed alternately in a direction orthogonal to the conveying direction.

Next, the second sheet 32 is attached to the long strip-shaped first sheet 31 being conveyed in the same direction while tension is applied to the second sheet 32 in the same direction as the conveyance direction. At this time, the tension applied to the second sheet 32 is set to a high tension state higher than the tension when the first sheet 31 is conveyed. Thereafter, the first laminated sheet 31 is conveyed to a downstream process so that the tension applied to the laminated sheet becomes the same as the tension when the first sheet 31 is conveyed.

張力 Since the tension applied to the second sheet 32 after the formation of the laminated sheet is lower than the tension applied before the formation of the laminated sheet, the high tension state on the second sheet 32 is released. As a result, the width of the second sheet 32 recovers so as to increase in the width direction Y, and the second sheet 32 located in the non-applied portion projects so as to be separated from the first sheet 31 so that the adhesive application direction The second ridge 33 has a ridge shape extending along. In addition, since the application portion of the adhesive is fixed without being separated from the first sheet 31, the application portion becomes the groove-shaped second concave portion 34 extending along the application direction of the adhesive. Thus, the ridge-shaped second sheet 32 is formed.

When the second sheet 32 is composed of a plurality of sheets, for example, the adhesive is applied to the inner layer side sheet of the second sheet 32 that forms the skin-facing surface side of the diaper 1 by applying a plurality of strips of adhesive. Then, the inner layer side sheet and the other sheet in a high tension state are attached. Thereafter, the high tension state of the other sheet is released, and a ridge shape may be formed on the other sheet. It is preferable to use an air-through nonwoven fabric for at least the other sheet.

お The diaper 1 shown in FIGS. 5 to 7 can be manufactured using a vertical flow type unfoldable disposable diaper manufacturing apparatus, similarly to the diaper 1 shown in FIG. 1 described above. That is, the belt-shaped back sheet 3 in which the extending direction of the ridge-shaped second convex portion 33 and the groove-shaped second concave portion 34 matches the transport direction of the back sheet 3 is prepared. Then, the absorber 4 is intermittently arranged along the transport direction on the first sheet 31 of the belt-shaped back sheet 3 to be transported. The absorber 4 is arranged on a surface of the first sheet 31 opposite to the surface on which the second sheet 32 is arranged. The strip-shaped top sheet 2 conveyed in the same direction as the back sheet 3 is supplied on the back sheet 3 on which the absorber 4 is arranged so as to overlap. The continuous body of the diaper 1 is formed by fixing the overlapped top sheet 2 and the absorber 4, between the absorber 4 and the back sheet 3, and between the top sheet 2 and the back sheet 3. Then, using a known cutting means, the continuous body of the diaper 1 is cut across the width direction between the absorbers 4 adjacent to each other in the transport direction so as to have a desired size of the diaper 1. Thereby, the desired diaper 1 is manufactured. When cutting the continuous body of the diaper 1, it is preferable that the tension applied to the continuous body in the transport direction be higher than usual. By performing cutting under such conditions, the second convex portion 33 of the second sheet 32 can be easily extended outward from the edge e1 of the end flap portion 1E.

Next, FIG. 8 shows a schematic configuration of a main part of a deployable disposable diaper according to another preferred embodiment of the present invention. In the diaper 1 shown in FIG. 1, the back sheet 3 has a laminated structure having a first sheet 31 and a second sheet 32. In addition, the topsheet 2 has a laminated structure including the upper nonwoven fabric 21 having the convex portions 24 and the lower nonwoven fabric 22. In the diaper 1 shown in FIG. 1, the end flap portion 1E is composed of a top sheet 2, a back sheet 3 and a side sheet 5. In the diaper 1 shown in the figure, the position of the edge X1 in the longitudinal direction of the first sheet 31 on the back sheet 3 is the same as the position of the edge 22e of the lower nonwoven fabric 22 and the edge of the side sheet 5 on the topsheet 2. I do.

In the diaper 1 shown in FIG. 8, the II-th convex portion 33 of the second sheet 32 in the back sheet 3 extends in the longitudinal direction from the edge e1 of the first sheet 31 in the back region 1A and the abdominal region (not shown). It extends outside of X. In addition, the convex portions 24 of the upper nonwoven fabric 21 in the topsheet 2 extend outward from the edge e1 of the first sheet 31 in the longitudinal direction X. By adopting such a configuration, the diaper 1 shown in the figure can have the convex portion 24 and the second convex portion 33 extending from the edge e1 even if the end flap portion 1E comes into contact with the skin during wearing. Are cushions, making it difficult to give a sense of discomfort or discomfort caused by the contact. In addition, from the viewpoint of improving the appearance, as shown in the drawing, the end 24e of the portion of the convex portion 24 extending from the edge e1 and the end 33e of the portion of the II convex portion 33 extending from the edge e1. Are preferably engaged. It is preferable that the engagement is performed by pressure bonding instead of fusion bonding from the viewpoint of feel.

As described above, the present invention has been described based on the embodiments. However, the present invention can be appropriately changed without being limited to the above embodiments.
For example, in the embodiment, the uneven structure is formed on the topsheet 2 using two nonwoven fabrics, the upper nonwoven fabric 21 and the lower nonwoven fabric 22. Instead, the uneven structure is formed only by one nonwoven fabric. You may.

The topsheet 2 used in the above embodiment has an uneven structure in which a plurality of projections 24 are formed in a scattered manner. Alternatively, for example, the topsheet described in JP-A-8-302555 may be used. Like a sheet, it may have an uneven structure in which ridges and grooves extending in one direction are alternately formed on the skin contact surface side of the topsheet.

The convex portion 24 of the topsheet 2 used in the above embodiment has two types of convex portions, that is, a first convex portion 41 and a second convex portion 42, but instead of this, the convex portion 24 It may have only a single height or a random height. As the protrusions having a single height, not only those having the same height and the same area of the space of the protrusion, but also those having the same height and different areas of the space of the protrusion are also available. No.

In the above-described embodiment, the convex portion 24 extends outward from the edge e1 in the longitudinal direction X of the back sheet 3 and the side sheet 5 in the back region 1A and the abdominal region (not shown). May extend outward from at least one edge e1 of the dorsal region 1A and the abdominal region (not shown).

吸収 Examples of the absorbent article of the present invention having the above configuration include, but are not limited to, pants-type disposable diapers, sanitary napkins, incontinence pads, etc., in addition to the deployable disposable diapers.

With respect to the embodiment of the present invention described above, the following absorbent article is further disclosed.
<1>
An absorbent article having a topsheet having an uneven structure having a plurality of projections and recesses, and a backsheet, having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction,
The end region in the longitudinal direction, at least comprises the top sheet and the back sheet,
An absorbent article in which at least one of the end regions, the convex portion of the topsheet extends outward in the longitudinal direction from an edge of the backsheet.
<2>
The topsheet has a laminated structure in which an upper nonwoven fabric located on the skin side of the wearer and a lower nonwoven fabric located on a side far from the wearer's skin are joined,
The convex portion, the upper nonwoven fabric is formed so as to protrude so as to be separated from the lower nonwoven fabric at a portion other than a bonding portion for joining the upper nonwoven fabric and the lower nonwoven fabric,
The upper nonwoven fabric and the lower nonwoven fabric have a length along the longitudinal direction before joining them, the upper nonwoven fabric is longer than the lower nonwoven fabric,
The absorbent article according to <1>, wherein the upper nonwoven fabric extends outward in the longitudinal direction from an edge of the back sheet.
<3>
The absorbent article according to <2>, wherein, in a plan view of the absorbent article, a position of an edge in a longitudinal direction of the lower nonwoven fabric coincides with a position of an edge of the back sheet.
<4>
The absorbent article according to <2> or <3>, wherein the lower nonwoven fabric has a substantially flat shape.
<5>
The protrusion is such that the upper layer nonwoven fabric projects so as to be separated from the lower layer nonwoven fabric at a portion other than a joining portion for joining the upper layer nonwoven fabric and the lower layer nonwoven fabric, so that the upper layer nonwoven fabric and the lower layer nonwoven fabric are separated from each other. Is formed to have a space in,
The absorbent article according to any one of <2> to <4>, wherein a space of the convex portion is visible at an edge of the back sheet.
<6>
<5> In the cross-sectional view along the width direction of the edge of the back sheet, the area of the space of the protrusion is larger in the width direction central region than in the width direction side region, according to <5>. Absorbent articles.
<7>
The item according to any one of <1> to <6>, wherein the amount of extension of the convex portion outward in the longitudinal direction is larger in the width direction central region than in the width direction side region. Absorbent articles.
<8>
The absorbent article comprises a ventral region, a dorsal region, and a crotch region between the ventral region and the dorsal region, and the at least one of the ventral region and the dorsal region includes the crotch region in the topsheet. The absorbent article according to any one of <1> to <7>, wherein the convex portion extends outward in the longitudinal direction from an edge of the back sheet.
<9>
The absorbent article includes a ventral region, a dorsal region, and a crotch region between the ventral region and the dorsal region, and the convexities on the topsheet in both the ventral region and the dorsal region. The absorbent article according to any one of <1> to <8>, wherein the portion extends outward in the longitudinal direction from an edge of the back sheet.

<10>
An absorbent article having a liquid-impervious back sheet disposed on the non-skin contact surface of the absorber, having a longitudinal direction corresponding to the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction,
The back sheet has a layered structure including a first sheet having poor liquid permeability and a second sheet disposed on a non-skin contact surface of the first sheet,
The second sheet has a concave-convex structure having a plurality of second convex portions and second concave portions,
The end portion in the longitudinal direction is constituted by at least the back sheet,
An absorbent article in which at least one of the end regions, the second convex portion of the second sheet extends longitudinally outward from an edge of the first sheet.
<11>
The absorbent article includes a surface sheet having an uneven structure having a plurality of convex portions and concave portions,
The end region in the longitudinal direction, at least comprises the top sheet and the back sheet,
The absorbent article according to <10>, wherein in at least one of the end regions, the protrusions on the topsheet extend outward in the longitudinal direction from an edge of the first sheet.
<12>
An end of a portion of the convex portion extending from an edge of the first sheet is engaged with an end of a portion of the second convex portion extending from an edge of the first sheet, The absorbent article according to <10> or <11>.

ADVANTAGE OF THE INVENTION According to the absorbent article of this invention, even if the edge of the edge area of an absorbent article contacts skin, it is hard to give a feeling of strangeness or discomfort.

Claims

An absorbent article having a topsheet having an uneven structure having a plurality of projections and recesses, and a backsheet, having a longitudinal direction corresponding to the front-back direction of the wearer and a width direction orthogonal to the longitudinal direction,
The end region in the longitudinal direction, at least comprises the top sheet and the back sheet,
An absorbent article in which at least one of the end regions, the convex portion of the topsheet extends outward in the longitudinal direction from an edge of the backsheet.
The topsheet has a laminated structure in which an upper nonwoven fabric located on the skin side of the wearer and a lower nonwoven fabric located on a side far from the wearer's skin are joined,
The convex portion, the upper nonwoven fabric is formed so as to protrude so as to be separated from the lower nonwoven fabric at a portion other than a bonding portion for joining the upper nonwoven fabric and the lower nonwoven fabric,
The upper nonwoven fabric and the lower nonwoven fabric have a length along the longitudinal direction before joining them, the upper nonwoven fabric is longer than the lower nonwoven fabric,
The absorbent article according to claim 1, wherein the upper nonwoven fabric extends outward in the longitudinal direction from an edge of the back sheet.
3. The absorbent article according to claim 2, wherein, in a plan view of the absorbent article, a position of an edge in a longitudinal direction of the lower-layer nonwoven fabric coincides with a position of an edge of the back sheet.
The absorbent article according to claim 2, wherein the lower nonwoven fabric has a substantially flat shape.
The protrusion is such that the upper layer nonwoven fabric projects so as to be separated from the lower layer nonwoven fabric at a portion other than a joining portion for joining the upper layer nonwoven fabric and the lower layer nonwoven fabric, so that the upper layer nonwoven fabric and the lower layer nonwoven fabric are separated from each other. Is formed to have a space in,
The absorbent article according to any one of claims 2 to 4, wherein a space of the convex portion is visible at an edge of the back sheet.
6. The cross-sectional view along the width direction at the edge of the back sheet, wherein the area of the space of the convex portion is larger in the width direction central region than in the width direction side region, according to claim 5. Absorbent articles.
The absorptive material according to any one of claims 1 to 6, wherein the amount of protrusion of the convex portion outward in the longitudinal direction is larger in the width direction central region than in the width direction side region. Goods.
The absorbent article comprises a ventral region, a dorsal region, and a crotch region between the ventral region and the dorsal region, and the at least one of the ventral region and the dorsal region includes the crotch region. The absorbent article according to any one of claims 1 to 7, wherein the projections extend outward in the longitudinal direction from the edge of the back sheet.
The absorbent article includes an abdominal region, a dorsal region, and a crotch region between the abdominal region and the dorsal region, and the convexities on the topsheet in both the abdominal region and the dorsal region. The absorbent article according to any one of claims 1 to 8, wherein the portion extends outward in the longitudinal direction from an edge of the back sheet.
An absorbent article having a liquid-impervious back sheet disposed on the non-skin contact surface of the absorber, having a longitudinal direction corresponding to the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction,
The back sheet has a layered structure including a first sheet having poor liquid permeability and a second sheet disposed on a non-skin contact surface of the first sheet,
The second sheet has a concave-convex structure having a plurality of second convex portions and second concave portions,
The end portion in the longitudinal direction is constituted by at least the back sheet,
An absorbent article in which at least one of the end regions, the second convex portion of the second sheet extends longitudinally outward from an edge of the first sheet.
The absorbent article includes a surface sheet having an uneven structure having a plurality of convex portions and concave portions,
The end region in the longitudinal direction, at least comprises the top sheet and the back sheet,
The absorbent article according to claim 10, wherein in at least one of the end regions, the protrusions on the topsheet extend longitudinally outward from an edge of the first sheet.
An end of a portion of the convex portion extending from an edge of the first sheet is engaged with an end of a portion of the second convex portion extending from an edge of the first sheet, The absorbent article according to claim 10.