JP2021171593A - Absorbent article - Google Patents

Abstract

To provide an inner type absorbent article whose back side is wide that is excellent in fitness to a paper diaper and prevents body fluid leakage.SOLUTION: An absorbent article has a top sheet 10, a back sheet 11, and an absorber 12. The absorbent article is 400 mm or longer in a longitudinal direction and is 140 mm or longer in a width direction. The absorbent article has a front area 6, an urination area 7 and a back area 8. A back area width is wider than the urination area and the front area, ranging from 200 mm to 350 mm; and an absorber width of the back area is wider than the absorber widths of the urination area and the front area, ranging from 160 mm to 320 mm. A proportion of the front area width and the back area width is 140:200 to 200:350, and a proportion of the absorber width of the front area and the absorber width of the back area is 125:160 to 190:340. The absorber of the back area configures a pair of ear parts 50, 51 on both outsides in the width direction, and there are provided absorption sheets 14, 16 on both sides or one side in a thickness direction of the ear parts. The absorption sheet supports a high absorbent polymer 37 among multilayer pulp-containing compound type non-woven fabric sheets 30, and flexure rigidity of at least the ear parts is 5.0 gf.cm2/cm or more.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

The composite non-woven fabric made of spunbonded non-woven fabric and pulp fiber web has both strength based on spunbonded non-woven fabric and liquid absorption property based on pulp fiber. It is widely used in various applications such as wipers.

Patent Document 1 discloses a composite non-woven fabric in which a spunbonded non-woven fabric and a pulp fiber web are superposed and integrated by a water flow entanglement treatment in which a high-pressure water jet (water stream) is sprayed onto the spunbonded non-woven fabric. Here, since the spunbonded non-woven fabric has excellent strength as described above, it functions as a backing layer of the manufactured composite non-woven fabric. On the other hand, the pulp fiber web has an excellent liquid absorbing function as described above. Therefore, this composite non-woven fabric is provided to consumers as an excellent wiper product having the advantages of a pulp fiber web having good liquid absorption against both water-based and oil-based liquids and a spunbonded non-woven fabric having excellent strength. Has been done.

On the other hand, general adult disposable diapers include a tape stopper type, a urine absorbing pad, a pants type, and the like, and these disposable diapers are appropriately selected and used according to the need for long-term care in excretion of the wearable person. An absorbent article such as a disposable diaper is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the two sheets. By adopting this configuration, body fluids such as urine permeate through the top sheet of the absorbent article and are absorbed by the absorber, and are prevented from leaking to the outside by the back sheet.

In addition to preventing leakage, absorbent articles are basically required to absorb body fluids quickly and to have little liquid return. For this purpose, a technique is adopted in which an air-through non-woven fabric made of a thermoplastic fiber is interposed between the top sheet and the absorber, or a slit or emboss is provided in the absorber.

Japanese Patent No. 2533260

Recently, many large-sized and large-capacity type pads that repeatedly absorb body fluids are commercially available. In particular, since body fluids easily leak from the back side at bedtime, it is desired that the back side of the pad to be inserted and attached to the outer paper diaper (tape type or pants type) be long in the width direction. However, when the conventional pad is inserted into the disposable diaper and attached, the pad does not fit well between the three-dimensional gathers of the disposable diaper, which may cause leakage of body fluid to the outside of the disposable diaper. In addition, since the back side of the pad has a wide ear portion, the side portion of the ear portion flutters and the degree of adhesion to the disposable diaper decreases, which may cause leakage or difficulty in wearing. .. There is still room for further improvement in terms of preventing leakage when using it at bedtime and attaching the pad to a disposable diaper.

An object of the present invention is to provide an inner type absorbent article which has a wide structure on the back side, has excellent wearability on an outer disposable diaper, and can prevent body fluid from leaking to the outside of the disposable diaper.

The present inventor has conducted diligent research in order to solve the above problems. As a result, by providing SAP sheets made of pulp-containing non-woven fabric on both sides of the wide portion of the rear portion (back side) of the absorbent article, a desired absorbent article was successfully obtained, and the present invention was completed. I arrived. That is, the present invention relates to the following absorbent articles.

(1) It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between them, and has a length of 400 mm or more in the longitudinal direction and a length in the width direction. An absorbent article having a size of 140 mm or more,
It has an anterior region that mainly contacts the wearer's abdomen, a urination region that mainly contacts the wearer's crotch, and a posterior region that mainly contacts the wearer's back.
The width of the posterior region is wider than the widths of the urination region and the anterior region, and is 200 mm or more and 350 mm or less.
The width of the absorber in the rear region is
It is wider than each width of the absorber in the urination area and the anterior area, and is 160 mm or more and 320 mm or less.
The ratio of the width of the front region to the width of the rear region (width of the front region: width of the rear region) is 140: 200 or more and 200: 350 or less, and the absorber width of the front region and the rear region. The ratio of the absorber width of is 125: 160 or more and 190: 340 or less (the absorber width in the front region: the absorber width in the rear region).
The absorber in the posterior region constitutes a pair of ears that extend outward on both sides in the width direction.
An absorption sheet arranged on the top sheet side and / or the back sheet side of the ear portion is provided.
The absorbent sheet includes a multi-layer pulp-containing composite non-woven fabric sheet and a highly absorbent polymer supported between the multi-layers thereof.
An absorbent article characterized in that the bending rigidity of the selvage portion is at least 5.0 gf · cm ^{2 / cm or more.}
(2) The pulp-containing composite non-woven fabric sheet contains a spunbonded nonwoven fabric and a pulp fiber web integrated on one surface of the spunbonded nonwoven fabric, and projects toward the spunbonded nonwoven fabric side in the thickness direction. The absorbent article according to (1) above, which has a convex portion and a concave portion recessed on the pulp fiber web side in the thickness direction alternately provided in a predetermined pattern in the surface direction.
(3) The absorbent sheet has high absorbency so that the internal space of the convex portion of one of the pulp-containing composite non-woven fabric sheets and the internal space of the convex portion of the other pulp-containing composite non-woven fabric sheet face each other. One and the other so that a polymer holding space is formed and the bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet and the bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet face each other. The absorbent article according to (2) above, wherein the pulp-containing composite non-woven fabric sheet is arranged, and the highly absorbent polymer is sealed in the highly absorbent polymer holding space.
(4) The absorbent article according to (2) or (3) above, wherein the concave portion is interposed between one said convex portion and another convex portion adjacent thereto and has a substantially groove-shaped cross-sectional view. ..
(5) The bottom surface of the recess of the pulp-containing composite non-woven fabric sheet on one side and the bottom surface of the recess of the recess of the pulp-containing composite non-woven fabric sheet on the other side are sealed in the highly absorbent polymer holding space. The absorbent article according to any one of (2) to (4) above, which is bonded to such an extent that the highly absorbent polymer is separated by swelling accompanying body fluid absorption.
(6) The pattern of the uneven portion is a grid pattern, a wavy pattern, an Aicon pattern pattern, a polka dot pattern, a scale pattern or a checkered pattern, or a plurality of polygons are arranged at equal intervals in the vertical and horizontal directions. The absorbent article according to any one of (2) to (5) above, which is the pattern obtained.
(7) the height of the inner space of the convex portion is 0.2mm or more 3.0mm or less, the area of the bottom surface of the convex portion is at 7 mm ² or more 95 mm ² or less, the opening area of the area ratio (the recess : The absorbent article according to any one of (2) to (6) above, wherein the convex portion has a top surface area of 38:62 or more and 62:38 or less.
(8) The pulp-containing composite non-woven fabric sheet is a water flow entangled integrated product of the spunbonded nonwoven fabric and the pulp fiber web, and in the water flow entangled integrated product, at least a part of the pulp fibers is the spunbonded nonwoven fabric. The pulp fiber web entangled with the fibers constituting the The absorbent article according to any one of (2) to (7) above.
(9) The absorbent article according to any one of (2) to (8) above, wherein the spunbonded non-woven fabric is a spunbonded non-woven fabric made of polypropylene.

According to the present invention, there is provided an inner type absorbent article which has a wide structure on the back side, is excellent in wearability to an outer disposable diaper, and can prevent body fluid from leaking to the outside of the disposable diaper.

It is a schematic diagram which shows the schematic structure of the absorbent article which concerns on 1st Embodiment of this invention. (A) is a plan view, and (b) is a cross-sectional view taken along the line BB shown in FIG. 1 (a). It is a schematic diagram which shows the schematic structure of the absorbent article which concerns on 2nd Embodiment of this invention. (A) is a plan view, and (b) is a cross-sectional view taken along the _{B 1-2 1 cutting line shown in FIG. 2 (a).} It is a schematic diagram which shows the schematic structure of the absorbent article which concerns on 3rd Embodiment of this invention. (A) is a plan view, (b) is a cross-sectional view taken along _B 2 -B ₂ cutting lines shown in FIG. 2 (a). It is a schematic plan view which shows the schematic structure of the absorption sheet laminated on the selvage part of the absorber in the absorbent article of this embodiment. It is a schematic cross-sectional view of the absorbent sheet in Y ₁ -Y ₁ cutting line shown in FIG. It is a schematic cross-sectional view of the absorption sheet after body fluid absorption.

In the present specification, the wearing of the absorbent article means a state in which the absorbent article is worn on the body before and after the absorption of the body fluid. In the absorbent article, the longitudinal direction is the direction extending to the front and back of the body through the wearer's crotch when the absorbent article is worn on the body, and the width direction is the direction orthogonal to the longitudinal direction. The thickness direction is the direction in which the constituent members are laminated. The skin side surface is the surface that comes into contact with the wearer's skin and the surface that faces the skin when the absorbent article is worn, and the non-skin side surface is the surface that comes into contact with the wearer's clothes or the surface that faces the clothes. .. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Absorbable article>
Hereinafter, the absorbent articles 1, 2 and 3 shown in FIGS. 1 to 3 are collectively referred to as the absorbent articles of the present embodiment. 1A and 1B are a plan view and a cross-sectional view of the absorbent article 1 of the first embodiment. FIG. 4 is a plan view showing a schematic configuration of absorbent sheets 14, 15, 16 and 17 (hereinafter, may be collectively referred to as “absorbent sheets 14 to 17”) used in the absorbent article of the present embodiment. Figure 5 is a cross-sectional view of the absorbent sheet 14 to 17 in the _Y 1 -Y ₁ cutting line shown in FIG. FIG. 6 is a schematic cross-sectional view of absorption sheets 14 to 17 after body fluid absorption. These drawings, including FIGS. 2 and 3 described later, do not define the shape, dimensions, size relationship, etc. of each component of the absorbent article of the present embodiment. Further, in FIGS. 1 (b), 2 (b) and 3 (b), some of the constituent members are described so as to be in close contact with each other in the thickness direction, but the present invention is not limited to this, and between them. There may be a gap in.

The absorbent article of the present embodiment can be used as various absorbent articles regardless of whether it is for babies or adults. For example, a light incontinence pad, a urine absorption pad, a pants-type disposable diaper, a tape-stopping disposable diaper, and the like can be mentioned. Among these, a combination of the absorbent article of the present embodiment inserted as an inner and various disposable diapers as an outer is preferable. Here, as the paper diaper, a tape stopper type or a pants type is preferable.

As shown in FIG. 1, the absorbent article 1 according to the first embodiment includes a liquid-permeable top sheet 10, a liquid-impermeable back sheet 11, and an absorber 12 arranged between them. have. In the present embodiment, both the skin side surface and the non-skin side surface of the absorber 12 are covered with the core wrap sheets 13A and 13B. The absorbent article 1 of the present embodiment has an anterior region 6 that mainly contacts the wearer's abdomen and urination that mainly contacts the wearer's crotch when the absorbent article 1 is worn in the longitudinal direction thereof. It is divided into a region 7 and a rear region 8 that mainly abuts on the back of the wearer.

As will be described in detail later, the absorber 12 of the absorbent article 1 of the present embodiment has a pair of ears 50, 51 extending outward in the width direction of the absorbent article 1 in the rear region 8. Absorbent sheets 14 and 16 are arranged between the portions 50 and 51 and the top sheet 10, respectively. The absorption sheets 14 and 16 each include a multi-layer pulp-containing composite non-woven fabric sheet 30 and a highly absorbent polymer 37 supported between the plurality of layers. Further, the bending rigidity of the laminated portion between the selvage portion 50 of the absorber 12 and the absorbent sheets 14 and 15 in the rear region 8 is 5.0 gf · cm ² / cm or more. Further, the absorbent article 1 may be provided with fixing means 19 and 20, if necessary.

In addition, the absorbent article 1 of the present embodiment has the following dimensional features.
The length a in the longitudinal direction is in the range of 400 mm or more or 400 mm or more and 720 mm or less, and the length b in the width direction is in the range of 140 mm or more or 140 mm or more and 200 mm or less. The width of the rear region 8 is wider than the width of the anterior region 6 and the width of the urination region 7, and is in the range of 200 mm or more and 350 mm or less. The ratio of the width of the front region 6 to the width of the rear region 8 is in the range of 140: 200 or more and 200: 350 or less as the width of the front region 6: the width of the rear region 8. The length a is in the range of 400 mm or more, the length b in the width direction is in the range of 140 mm or more, the width of the rear region 8 is the above-mentioned range, and the ratio of the width of the front region 6 to the width of the rear region 8 is set. By setting the above range, when the absorbent article 1 is used as the inner of various disposable diapers (outer), misalignment and partial turning over are unlikely to occur, and the absorbent article 1 tends to be stably stored in the disposable diaper. There is.

With the above-mentioned configuration, the rear area 8 (back side) has a wide structure, but it is easy to attach to the outer disposable diaper, and it is an absorbent article that can reduce the leakage of body fluid to the outside of the disposable diaper, in other words. , There is almost no leakage of the outer to the disposable diaper, good adhesion to the disposable diaper is maintained, and an absorbent article having an excellent wearing feeling can be obtained together with the outer.
Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in detail step by step. Each component may have a three-dimensional shape other than a sheet shape or a plate shape.

(Top sheet)
The top sheet 10 is a liquid-permeable sheet-like member that allows body fluids to quickly pass toward the absorber 12. As the top sheet 10, a liquid-permeable material can be used without particular limitation, but since it may come into contact with the wearer's skin, a base material having a soft feel and not irritating to the skin. Is preferable. Examples of the base material include a hydrophilic non-woven fabric, a composite non-woven fabric which is a laminate of the same or different types of hydrophilic non-woven fabric, an open film such as an open polyethylene film, and a foam film such as a urethane foam film. As the hydrophilic non-woven fabric, for example, synthetic fibers made of synthetic resin such as polypropylene or polyethylene, recycled fibers such as rayon, and natural fibers such as cotton are used, and known methods such as air-through method, thermal bond method, spunlace method, and spunbond method are used. It is obtained by processing by the method of.

The surface of the top sheet 10 may be embossed or perforated in order to improve liquid permeability. The embossing and drilling can be performed according to, for example, a known method. Further, in order to reduce irritation to the skin, the top sheet 10 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer and the like. From the viewpoint of strength, workability and liquid return amount, the basis weight of the top sheet 10 is, for example, 15 g / m ² or more and 40 g / m ² or less. The shape of the top sheet 10 is not particularly limited, but it may be a shape that covers the absorber 12 according to the plan view shape of the absorber 12 in order to guide the body fluid to the absorber 12 so as not to leak.

(Absorber)
The absorber 12 of the present embodiment is arranged between the top sheet 10 and the back sheet 12 in a state where both the skin side surface and the non-skin side surface are covered with the core wrap sheets 13A and 13B. Absorb and retain. As shown in FIG. 1, the absorber 12 of the present embodiment extends in a band shape from the middle portion of the front region 6 toward the urination region 7, and is recessed inward in the width direction from the urination region 7 to the rear region 8. A pair of ears 50, 51 in which the width direction dimension continuously increases along the arcuate edge, spreads in a fan shape from the urination area 7 toward the posterior area 8, and extends outward in both width directions in the posterior area 8. Consists of.

In the absorber 12, the ratio of the width of the absorber 12 in the front region 6 to the width of the absorber 12 in the rear region 8 is 125: The range is 160 or more and 190: 340 or less, or 125: 200 or more and 160: 260 or less. The width of the absorber 12 in the rear region 8 is wider than the widths of the absorber 12 in the front region 6 and the urination region 7, and is in the range of 160 mm or more and 320 mm or less or 200 mm or more and 260 mm or less. By configuring each dimension of the absorber 12 as described above and each dimension of the absorbent article 1 as described above, a pair of ears extending outward in the width direction to the absorber 12 in the rear region 8. Absorbent article 1 that has improved insertability and adhesion into the inside of the disposable diaper, is less likely to be displaced inside the disposable diaper, and does not impair the very good wearing feeling of the disposable diaper, despite the provision of the portions 50 and 51. Is obtained.

In the present embodiment, the width of the absorber in the posterior region 8 is read as "maximum width of the absorber in the rear region 8", and the width of the absorber in the urination region 7 is read as "maximum width of the absorber in the urination region 7". It is configured to meet the regulations. In the present embodiment, the absorber 12 has the above-mentioned fan-shaped plan view shape, but the dimension of the absorber 12 in the width direction is not limited to this, and the dimension of the absorber 12 is changed from the urination area 7 to the posterior area 8. It also includes an embodiment in which the size is gradually increased, an embodiment in which the size is gradually or continuously increased from the side adjacent to the urination area 7 in the posterior area 8 toward the side away from the urination area 7. Further, the absorber 12 may be provided with a slit or groove as shown in the second embodiment, and may be further embossed.

The absorber 12 includes, for example, an absorbing base material and an absorbing component supported on the absorbing base material.
As the absorbent base material, for example, an absorbent base material contained in a sanitary napkin, a diaper, a urine pad or the like can be used, and examples thereof include fluff pulp and a hydrophilic sheet. Fluff pulp includes, for example, cotton-like defibrated products such as wood pulp, synthetic fiber, and non-wood pulp such as synthetic resin fiber. Hydrophilic sheets include, for example, tissue, absorbent paper, hydrophilic non-woven fabric and the like. In addition, an acetate tow spread fiber can be used as an absorbent base material.

The absorbing component includes, for example, a super absorbent polymer (hereinafter, also referred to as “SAP”) and the like. As the highly absorbable polymer used in the present embodiment, various polymers capable of absorbing and retaining body fluid and preventing backflow of body fluid can be used without particular limitation. Examples thereof include polymers containing a carboxyl group-containing monomer as a constituent unit, such as a (acrylic acid) graft copolymer, a (acrylic acid / vinyl alcohol) copolymer, a (isobutylene / maleic anhydride) copolymer, and a saponified product thereof. .. The highly absorbent polymer may be used alone or in combination of two or more. Among these, polyacrylate is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of body fluid absorbed per weight.

The form of the highly absorbent polymer is not particularly limited, but is preferably in the form of particles, and more preferably in the form of particles having a medium particle size, from the viewpoint of suppressing the occurrence of gel blocking and the like. The medium particle size of the highly absorbent polymer is, for example, in the range of 50 μm or more and 600 μm or less, or in the range of 50 μm or more and 550 μm or less. ^{Further, the basis weight of the highly absorbent polymer is, for example, 90 g / m 2} or more and 240 g / m from the viewpoint of the balance between the body fluid absorption capacity (body fluid absorption amount) of the absorber 12 and the wearing feeling after repeatedly absorbing the body fluid. ^{It is 2} or less. The absorber 12 is formed in the form of a single-layer or multi-layer sheet by using the above-mentioned absorbing base material and absorbing component. Among these, those formed by mixing the hydrophilic fiber matrix of the web of fluff pulp from wood pulp with SAP particles are preferable.

The absorber 12 may be used by stacking two or more layers. The thickness of the absorber 12 is appropriately selected according to the type of body fluid to be absorbed, the form and material of the absorber 12, and the like. Further, from the viewpoints of absorbability and retention of body fluid, shape retention of the absorber 12, prevention of SAP falling off, and the like, the entire absorber 12 may be coated with a hydrophilic sheet, if necessary. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 12, the absorber 12 may be wrapped with a hydrophilic sheet (not shown) such as tissue.

(Core wrap sheet)
The core wrap sheets 13A and 13B cover the surface of the absorber 12 on the top sheet 10 side and the surface on the back sheet 11 side, respectively, and are between the absorber 12 and the absorbent sheets 14 and 16 in the thickness direction of the absorber article 1, respectively. It functions to spread the body fluid supplied through the top sheet 10, for example, substantially uniformly over the skin side surface or the non-skin side surface of the absorber 12. The basis weight of the core wrap sheets 13A, 13B is not particularly limited, for example 40 g / ^{m 2} or more ranges or 40 g / ^{m 2} or more 60 g / ^{m 2} or less.

The core wrap sheets 13A and 13B are not particularly limited as long as they are a liquid-permeable base material, and are, for example, air-through non-woven fabrics, thermal-bonded non-woven fabrics, spunbonded non-woven fabrics and other non-woven fabrics, thermal-bonded non-woven fabrics / spunbonded non-woven fabrics and the like. Examples thereof include a composite non-woven fabric in which the same or different types of non-woven fabrics are laminated, a foamed film made of urethane foam, polyethylene foam, or the like, and a composite sheet which is a laminate of two or more of these. Among these, an air-through non-woven fabric is preferable from the viewpoint of preventing the transfer of body fluid to the three-dimensional gather 18. The plan-view shape of the core wrap sheets 13A and 13B is not particularly limited as long as it covers the entire skin side surface or non-skin side surface of the absorber 12. In the present embodiment, the core wrap sheets 13A and 13B are arranged at the above-mentioned positions, but this embodiment also includes an embodiment in which the core wrap sheets 13A and 13B are not arranged.

(Absorption sheet)
As shown in FIGS. 4 and 5, the absorption sheets 14 and 16 are laminated on the skin side surfaces of the ears 50 and 51 of the absorber 12. By providing the absorbent bodies 12 with the ears 50 and 51 and disposing the absorbent sheets 14 and 16, the absorbent article 1 capable of preventing leakage of the body fluid to the outside, particularly to the back side, is provided. In this embodiment, the absorbent sheets 14 and 16 are arranged on the top sheet 10 side of the ears 50 and 51, but the present invention is not limited to this, and the top sheet 10 side and the back sheet 11 side of the ears 50 and 51 are not limited to this. The embodiment in which the ears are arranged only on the back sheet 11 side of the ears 50 and 51, and the ears 50 are arranged on either the top sheet 10 side or the back sheet 11 side of the ears 50. The embodiment and the like arranged on the other side of the top sheet 10 side and the back sheet 11 side of the part 51 are included.

In the present embodiment, the absorbent sheet 14, the core wrap sheet 13A, the ear portion 50, and the laminated portion composed of the core wrap sheet 13B, and the absorbent sheet 16, the core wrap sheet 13A, the ear portion 51, and the core wrap sheet 13B constructed laminate portion, respectively, a bending range rigidity following 5.0gf · ^cm 2 / ^cm or more ranges or 5.0gf · ^cm 2 / ^cm or more 30gf · ^cm 2 / ^cm. The lower the value of flexural rigidity, the easier it is to bend. By setting the flexural rigidity to 5.0 gf · cm ² / cm or more, the work of inserting the absorbent article 1 into the disposable diaper can be smoothly carried out, and the mounting stability of the absorbent article 1 in the disposable diaper (misalignment). Prevention, etc.) is improved. The flexural rigidity can be adjusted by appropriately selecting the thickness and material of the ears 50, 51, the absorbent sheets 14 to 17, the core wrap sheets 13A, 13B, and the like.

The laminated portion (hereinafter, also simply referred to as “laminated portion”) for which the bending rigidity is to be measured differs depending on the arrangement of the constituent members of the laminated portion in the thickness direction near the ears 50 and 51, and the core wrap sheets 13A and 13B are arranged. If not, for example, it is a laminated portion of the selvage portion 50 and the absorbent sheets 14 and 15, and if only the core wrap sheet 13A (or the core wrap sheet 13B) is arranged, the selvage portion 50 and the core wrap are arranged. It is a laminated portion of the sheet 13A (or core wrap sheet 13B) and the absorbent sheets 14 and 15, the core wrap sheets 13A and 13B are not arranged, and the absorbent sheet 14 on the top sheet 10 (or back sheet 11) side. When only (or the absorbent sheet 15) is arranged, it is a laminated portion of the ear portion 50 and the absorbent sheet 14 (or the absorbent sheet 15). It is the same as the laminated portion of the selvage portion 51 and the laminated portion of the selvage portion 50.

Flexural rigidity is measured by inserting a sample (predetermined laminated portion) into a fixed chuck and a moving chuck of a bending tester (trade name: KES-FB2, manufactured by Kato Tech Co., Ltd.) and setting it. The moving chuck moves to the maximum positive curvature + 2.5 cm ^-1 and reverses to pass the curvature 0, then ^{moves to the negative maximum curvature -2.5 cm -1} and reverses to end the measurement at 0 curvature. In this way, a reciprocating curve of the bending moment with respect to the curvature of one cycle can be obtained. In the reciprocating curve of bending moment, the slope between the curvature 0.5 cm ^-1 and 1.5 cm ^-1, and bending stiffness the average value of the slope between the curvature -0.5Cm ^-1 and -1.5Cm ^-1 do.

Each of the absorbent sheets 14 to 17 of the present embodiment has a form in which the highly absorbent polymer 37 is sealed between two pulp-containing composite non-woven fabric sheets 30. The number of laminated pulp-containing composite non-woven fabric sheets 30 of the present embodiment is not limited to two, and any number of laminated sheets can be selected for three or more. In one embodiment of the absorption sheets 14 to 17, the pulp-containing composite nonwoven fabric sheet 30 includes a spunbonded nonwoven fabric 31 and a pulp fiber web 32 integrated therein, and has an uneven portion 40 on the entire surface thereof. ing. In the present embodiment, the uneven portion 40 is formed on the entire surface of the pulp-containing composite non-woven fabric sheet 30, but the present invention is not limited to this, and may be formed on a part of the pulp-containing composite non-woven fabric sheet 30.

Further, in the absorption sheets 14 to 17 of one embodiment, the pulp fiber webs 32 of the two pulp-containing composite non-woven fabric sheets 30 face each other and partially contact each other, and the two pulp-containing composite non-woven fabric sheets 30. The convex portions 35 face each other to form a highly absorbent polymer holding space 34, and the internal spaces of the concave portions 36 of the two pulp-containing composite non-woven fabric sheets 30 face each other to form the bottom surface of the pulp fiber web 32 side. Two pulp-containing composite non-woven fabric sheets 30 are laminated so that is a contact surface or a loose joint surface 33. The material constituting the pulp-containing composite non-woven fabric sheet 30 will be described later, and here, the uneven portion 40 will be described first.

As shown in FIG. 4, the uneven portion 40 of the present embodiment has a convex portion 35 having a substantially hexagonal top surface and a groove-shaped concave portion 36 in a predetermined pattern in the surface direction of the pulp-containing composite nonwoven fabric sheet 30. It has a form in which it is provided alternately. The pattern of the present embodiment is one convex portion 35, six peripheral convex portions 35 in the left-right direction, the upper diagonal left-right direction, and the lower diagonal left-right direction, and one side of the six sides of the hexagon. Is a pattern arranged so as to be substantially parallel to each other and separated from each other by recesses 36 arranged along the periphery of the convex portion 35, and a plurality of polygons are arranged at equal intervals in the vertical and horizontal directions. Is one embodiment. Here, examples of the polygon include a substantially equilateral triangle, a substantially square, a substantially rectangle, a substantially rhombus, a substantially parallelogram, a substantially pentagon, a substantially polygon of a hexagon or more, and the like. The pattern of the uneven portion 40 is not limited to the present embodiment, and may be a grid pattern, a wavy shape, an acorn pattern (continuous acorn shape), a polka dot pattern, a scale pattern, a checkered pattern, or the like. Further, a pattern in which two or more patterns are combined may be used. It is self-evident that the same effect can be obtained because all the patterns are the same in that they form the highly absorbent polymer holding space 34, which is a closed space for the time being.

The convex portion 35 of the present embodiment protrudes toward the spunbonded nonwoven fabric 31 (or topsheet 10) in the thickness direction of the pulp-containing composite nonwoven fabric sheet 30, and the top surface thereof is a flat surface having a substantially hexagonal plan view shape. Is. The recess 36 is a groove that is recessed toward the pulp fiber web 32 (or bag sheet 12) side and extends linearly while being bent along the edge of the convex portion 35, and tends to be a diffusion path for body fluids. Therefore, the recess 36 further improves the liquid absorption property and the body fluid diffusivity inherent in the pulp fiber web 32, so that almost all the highly absorbent polymers 37 in the absorption sheets 14 to 17 can be used for the absorption of the body fluid. do. As a result, the amount of the highly absorbent polymer 37 enclosed in the absorbent sheets 14 to 17 can be adjusted within an appropriate range, and the thickness of the laminated portion between the ears 50 and 51 of the absorbent body 12 and the absorbent sheets 14 to 17 can be adjusted. The absorbent article 1 can be thinned to such an extent that it does not impair the good wearing feeling.

The recess 36 may have an inverted trapezoidal shape in cross section (a shape in which the diameter of the opening is larger than the diameter of the bottom surface), a U shape, a V shape, or the like. The width dimension X (FIG. 4) of the opening of the concave portion 36 is appropriately selected according to the area of the top surface of the convex portion 35, the shape in a plan view, the arrangement pattern of the convex portion 35 and the concave portion 36, and the like, which will be described later. From the viewpoint of realizing a loosely joined state, it is, for example, 0.3 mm or more and 1.0 mm or less.

The convex portion 35 of one pulp-containing composite nonwoven fabric sheet 30 (hereinafter, also referred to as “one convex portion 35”) and the convex portion 35 of the other pulp-containing composite nonwoven fabric sheet 30 (hereinafter, also referred to as “other convex portion 35”). The term ") means that the internal spaces face each other to form a highly absorbent polymer holding space 34. The highly absorbent polymer 37 enclosed in the highly absorbent polymer holding space 34 may or may not be fixed to the surface of the pulp fiber web 32 which is the inner wall surface of the highly absorbent polymer holding space 34. , A part may be fixed and the rest may not be fixed. For example, a hot melt adhesive or the like is used for fixing the highly absorbent polymer 37. As the highly absorbent polymer 37 enclosed in the highly absorbent polymer holding space 34, the same highly absorbent polymer used for the absorber 12 can be used without particular limitation.

The height of the internal space of the convex portion 35 is a balance between the amount of the highly absorbent polymer enclosed in the highly absorbent polymer holding space 34 and the thickness of the absorber 11 at the time when the body fluid is absorbed to the maximum, and the convex portion. From the viewpoint of shape retention of 35, for example, it is 0.2 mm or more and 3.0 mm or less. Here, the height of the internal space of the convex portion 35 is the height in the direction perpendicular to the virtual surface in which a plurality of contact surfaces or loose joint surfaces 33 are connected in the vertical and horizontal directions. Further, the area of the opening on the pulp fiber web 32 side of the convex portion 35 is, for example, 7 mm ² or more and 95 mm ² or less from the viewpoint of adjusting the encapsulation amount of the highly absorbent polymer 37. When the convex portion 35 is a columnar body, the area of the top surface of the convex portion 35 and the area of the opening on the pulp fiber web 32 side are substantially equal to each other.

Further, the bottom surface of the recess 36 (hereinafter, also referred to as “one recess 36”) of the one pulp-containing composite non-woven fabric sheet 30 on the pulp fiber web 32 (or back sheet 12) side (hereinafter, “bottom surface of one recess 36”). And the bottom surface (hereinafter, "bottom surface of the other recess 36") of the other pulp-containing composite non-woven fabric sheet 30 on the pulp fiber web 32 (or back sheet 12) side of the recess 36 (hereinafter, also referred to as "other recess 36"). (Also referred to as) means a contact surface or a loose joint surface 33 facing each other as shown in FIG. Here, loose bonding means that the bottom surfaces of one and the other recesses 36 are bonded to each other to make each highly absorbent polymer holding space 34 a closed space, but when the highly absorbent polymer 37 absorbs body fluid and swells. In addition, it refers to a joint in which the joint state is eliminated as the volume expands and the bottom surfaces of one and the other recesses 36 are separated from each other. Here, as the joining method, known methods such as heat fusion and ultrasonic bonding can be used. For loose bonding, the encapsulation amount of the highly absorbent polymer 37 is kept constant, various bonding conditions are set, repeated experiments are repeated, and the loose bonding described above is performed according to the encapsulation amount of the high absorption polymer 37. The joining conditions that can realize the joining may be appropriately selected.

On the surface of the pulp-containing composite non-woven fabric sheet 30 on the spunbonded non-woven fabric 31 side, the area ratio (opening area of the concave portion 36: top surface area of the convex portion 35) is the encapsulation amount of the highly absorbent polymer 37, the bonding strength, and the diffusibility. From the viewpoint of securing, for example, it is 38:62 or more and 62:38 or less. The dimensions of the convex portion 35 and the concave portion 36 are obtained by using, for example, an analysis application of a one-shot 3D shape measuring machine (trade name: controller VR-3000 Series, manufactured by KEYENCE CORPORATION). For example, when the height difference between the convex portion 35 and the concave portion 36 is measured using the analysis application, the height of the convex portion 35 and the depth of the concave portion 36 can be obtained. Further, when the distance between the centers of the convex portions 35 is measured, the distance between the convex portions 35 can be obtained.

As the spunbonded non-woven fabric 31 of the pulp-containing composite non-woven fabric sheet 30, a non-woven fabric produced by a spunbond method, a melt blow method, a flash spinning method or the like can be used without particular limitation, and the material thereof is, for example, nylon (trade name). ), Synthetic resins such as vinylon, polyester, acrylic resin, polyethylene, polypropylene and polystyrene can be preferably used. The spunbonded nonwoven fabric 31 may contain a plurality of synthetic resin fibers. Among these, the spunbonded non-woven fabric 31 containing polypropylene fibers is preferable from the viewpoint of strength, softness and the like, and the spunbonded non-woven fabric 31 in which all the constituent fibers are polypropylene fibers is more preferable. The basis weight of the spunbonded nonwoven fabric 31 is not particularly limited, but is, for example, 7 g / m ² or more and 20 g / m ² or less from the viewpoint of tensile strength and softness of touch.

The pulp fiber web 32 is not particularly limited, and for example, a layer made of a non-woven fabric mainly composed of pulp fibers (hereinafter, also referred to as “pulp non-woven fabric”), a layer in which pulp fibers are entangled with each other, a very small amount of adhesive for pulp fibers, and the like. Examples thereof include a layer fixed with a binder. Among these, a layer in which pulp fibers are entangled with each other is preferable from the viewpoint of strength, softness and the like. The pulp fiber used here is not particularly limited, and examples thereof include coniferous bleached kraft pulp (hereinafter, also referred to as “NBKP”) such as radiata pine, slash pine, southern pine, lodge pole pine, spruce and Douglas fur. .. NBKP can be used alone or in combination of two or more. The basis weight of the pulp fiber web 32 is not particularly limited, but is, for example, 30 g / m ² or more and 70 g / m ² or less from the viewpoint of uniformity, tactile sensation, absorbency and the like.

The content of the pulp fiber is, for example, 65% by mass or more and 90% by mass or less of the total amount of the pulp-containing composite nonwoven fabric sheet 30, and the balance is spunbonded nonwoven fabric 31 or 70% by mass or more and 85% by mass or less. The rest is the spunbonded non-woven fabric 31. If the content of the pulp fiber is less than 65% by mass, the pulp-containing composite non-woven fabric sheet 30 that is stable in terms of body fluid absorbability, diffusivity, etc. tends not to be formed, and if it exceeds 90% by mass, the pulp-containing composite non-woven fabric sheet 30 tends not to be formed. The sheet 30 tends to be stiff.

The basis weight of the pulp-containing composite non-woven fabric sheet 30 as a whole is, for example, 40 g / m ² or more and 80 g / m ² or less, or 40 g / m ² or more and 60 g / m ² or less. If it is less than 40 g / m ² , the pulp-containing composite non-woven fabric sheet 30 tends to be too soft, and if ^{it exceeds 80 g / m 2} , the pulp-containing composite non-woven fabric sheet 30 tends to be too hard.

Further, with respect to the pulp-containing composite nonwoven fabric sheet 30, the force (tensile strength) required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction in the tensile strength test with Tencilon is not particularly limited, but for example, 1 It is .5N / 25mm or more and 5.0N / 25mm or less.

The thickness of the pulp-containing composite non-woven fabric sheet 30 is, for example, 0.25 mm or more when measured using a thickness gauge (trade name: dial thickness gauge "PEACOCK (registered trademark), manufactured by Ozaki Seisakusho Co., Ltd.). 50 mm or less, or 0.30 mm or more and 0.45 mm or less. If the value is lower than this range, the pulp-containing composite non-woven fabric sheet 30 becomes too soft, and the pulp-containing composite non-woven fabric sheet 30 is used during the production of the absorbent article 1. There is a tendency that stable fixing cannot be performed. Further, when the value is higher than this range, the pulp-containing composite non-woven fabric sheet 30 tends to be hard.

The spunbonded non-woven fabric 31 and the pulp fiber web 32 can be integrated by, for example, a thermocompression bonding method, a water flow entanglement method, or an adhesive-based integration. Among these methods, if the water flow confounding method is used, a pulp-containing composite non-woven fabric sheet 30 having both appearance, softness of touch and strength can be obtained. According to the water flow entanglement method, by spraying wood pulp fibers together with water flow on the non-skin side surface of the spunbonded nonwoven fabric 31 without using a binder or an adhesive, the pulp fibers are entangled in the pulp fiber web 32 and the pulp fibers are entangled and spanned. The constituent fibers of the bonded nonwoven fabric 31 and the pulp fibers are entangled to obtain a water flow entangled integrated product in which the spunbonded nonwoven fabric 31 and the pulp fiber web 32 are firmly integrated.

As one embodiment of such a water flow entanglement integrated product, at least a part of the pulp fibers are entangled with the fibers (synthetic resin fibers) constituting the spunbonded nonwoven fabric 31 and / or other pulp fibers, and one of the spunpond nonwoven fabrics 21. Examples thereof include a water flow entangled integrated product containing a pulp fiber web 32 fixed to the surface of the surface and a pulp fiber penetrating the spunbonded non-woven fabric in the thickness direction and projecting outward from the other surface. When the above-mentioned uneven portion 40 is formed in this embodiment, pulp fibers are exposed on the surface of the convex portion 35 and the concave portion 36 on the spun-pound non-woven fabric 31 side, and the exposed pulp fibers serve as a guide path for body fluid, and the uneven portion 40 is formed. The three-dimensional structure (particularly the recess 36) and the pulp fiber web 32 cooperate synergistically to obtain extremely rapid diffusion and absorption retention of the body fluid throughout the absorber 12, increasing the absorption rate and improving wetback. .. The water flow entangled integrated product of the above embodiment can be obtained, for example, by appropriately adjusting the pressure of the water flow sprayed on the spunbonded nonwoven fabric 31. Among the water-flow entangled integrated products of the above embodiment, it is more preferable that the spunbonded non-woven fabric 31 is a spunbonded non-woven fabric made of polypropylene from the viewpoint of strength, softness and absorbability.

The uneven portion 40 is formed on the pulp-containing composite non-woven fabric sheet 30 by, for example, embossing. Examples of the embossing include known methods such as heat embossing, ultrasonic embossing, and high frequency embossing. Pressurization and / or heating and embossing may be performed at the same time.

<Making an absorbent sheet>
For the absorption sheets 14 to 17, for example, one pulp-containing composite non-woven fabric sheet 30 with the top surface of the convex portion 35 facing downward is prepared, and the highly absorbent polymer 37 is fixed and / or non-adhered to the internal space of the convex portion 35. It is stored by fixing, and another pulp-containing composite non-woven fabric sheet 30 is laminated with the top surface of the convex portion 35 facing upward, and the edges of one and the other pulp-containing composite non-woven fabric sheet 30 are joined to each other. Further, if necessary, it can be produced by loosely joining the bottom surfaces of the pulp fiber web 32 side of the recess 36. It is also possible to simultaneously join one and the other four peripheral edges of the pulp-containing composite non-woven fabric sheet 30 and the bottom surfaces of the recesses 36 on the pulp fiber web 32 side.

(Back sheet)
The backsheet 11 is arranged on the most non-skin side of the absorbent article 1, and is, for example, a breathable or non-breathable liquid such that the body fluid held by the absorber 12 does not wet clothing or adhere to the skin surface. It consists of an impermeable substrate. Examples of the liquid-impermeable base material for the back sheet 11 include a resin film, a composite sheet which is a laminate of a resin film and a non-woven fabric, and the like. Examples of the resin film include a film made of a synthetic resin such as polyester, polyvinyl alcohol, polyethylene, and polypropylene, and a composite film which is a laminate of a polyethylene film and a polypropylene film. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method. Examples thereof include a composite non-woven fabric which is a laminated body with.

The basis weight of the back sheet 11 is not particularly limited, but is, for example, 15 g / m ² or more and 40 g / m ² or less from the viewpoint of strength and workability. Further, in order to prevent stuffiness when worn, there is a form in which the back seat 11 is provided with breathability. The method of imparting breathability to the backsheet 11 is not particularly limited, and a known method can be adopted. For example, a method of making the resin film which is the base material for the backsheet porous, and embossing the base material for the backsheet. There is a method of applying. As an example of the method of making the resin film porous, there is a method of adding a filler to the resin to form a film, and removing the filler from the obtained film. Examples of the filler include inorganic salts such as calcium carbonate.

(Three-dimensional gather)
The three-dimensional gather 18 is provided, for example, to prevent lateral leakage of body fluid excreted by the wearer of the absorbent article 1. In the three-dimensional gather 18 of the present embodiment, one end in the width direction is fixed near both ends in the width direction of the skin side surface of the back sheet 11, and the middle part in the width direction is fixed near both ends in the width direction of the top sheet 10. The three-dimensional gather sheet 18a, which has free ends and covers the periphery of both ends in the width direction of the top sheet 10 and extends in the longitudinal direction, and the three-dimensional gather sheet 18a are arranged so as to extend in the longitudinal direction near the free ends. It is a constituent member that includes the elastic elastic member 18b and is provided so as to be bendable from an intermediate portion in the width direction of the three-dimensional gather sheet 18a. By arranging an elastic elastic member near the free end of the three-dimensional gather sheet 18a, the free end is provided with erectability and can be deformed according to the wearer's body shape. In the present embodiment, one end in the width direction of the three-dimensional gather 18 is fixed to the skin side surface of the back sheet 11, but the present embodiment is not limited to this, and for example, one end in the width direction is fixed to the non-skin side surface of the back sheet 11. It may be fixed to the laminate composed of the top sheet 10 and the back sheet 11, and may be further fixed to the skin side surface of the top sheet 10.

The three-dimensional gather sheet 13a is a laminated body of a water-repellent or liquid-impermeable non-woven fabric formed of hydrophobic fibers, for example, a spunbonded non-woven fabric, a melt-blown non-woven fabric, and a spunbond occupation / melt-blow non-woven fabric / spunbonded non-woven fabric. Examples include composite woven fabrics. Examples of the elastic elastic member 13b include thread-shaped, string-shaped, and strip-shaped members made of natural rubber, synthetic rubber, polyurethane, and the like. The absorbent article 1 of the present embodiment also includes an embodiment that does not include the three-dimensional gather 18.

(Fixing means)
In the front area 6 and the rear area 8, the back sheet 11 in the absorbent article 1 of the present embodiment fixes the front area 6 fixing means 20 and the rear area 8 as detachable fixing means to the top sheet 10 of the disposable diaper. The means 19 may be provided on each non-skin side surface. Also in the urination area 7, fixing means may be provided along both edges in the width direction of the top sheet 10. By having the fixing means at two or three places, the absorbent article 1 and the disposable diaper can be fixed without generating an extra space, sufficient fixing property and fit can be obtained, and lateral leakage can be prevented. Can be done. The fixing means is not particularly limited, and examples thereof include a hook tape and a hook-and-loop fastener. Among these, a hook tape is preferable.

<Manufacturing method of absorbent articles>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, the back sheet 12, the absorber 11, and the top sheet 10 are laminated in this order from the clothing side, and the top sheet is used. It can be manufactured by fixing the 10 and the back sheet 12 with a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, or the like over a part or the entire circumference, and further attaching a three-dimensional gather 18. Then, this may be individually wrapped in a package, and then folded in three in the longitudinal direction.

2A and 2B are a plan view and a cross-sectional view of the absorbent article 2 of the second embodiment. The absorbent article 2 is a modification of the absorbent article 1 and has the same configuration as the absorbent article 1 except that it has an absorbent body 12A instead of the absorbent body 12. In the absorbent article 2, each component having the same function as that of the absorbent article 1 is designated by the same reference numeral as that of the absorbent article 1, and the description thereof will be omitted. The absorber 12A is provided with a hollow slit 21 extending in the longitudinal direction and penetrating in the thickness direction at the central portion in the width direction.

The slit 21 is located in the central portion of the absorber 12A in the width direction in the longitudinal direction from the vicinity of the end on the side away from the urination region 7 in the rear region 8 to the vicinity of the end on the side close to the urination region 7 in the front region 6. It is extending. By providing the slit 21, when the body fluid is repeatedly absorbed, it is possible to suppress a decrease in the absorption amount and the absorption rate, and further reduce the leakage of the body fluid from the side, particularly from the back side. The plan view shape of the opening of the slit 21 is oval in the present embodiment, but is not limited to this, and may be a rectangle, a quadrangle with rounded rectangular corners, an elliptical shape long in one direction, or the like. .. The number of slits 21 is one in the present embodiment, but is not limited to this, and may be two or more. The length (longitudinal dimension) and width (width direction dimension) of the slit 21 are not particularly limited, but for example, the length is in the range of 100 mm or more and 300 mm or less, and the width is in the range of 10 mm or more and 40 mm or less. By setting the length and width in these ranges, it is possible to maintain the absorption rate even after repeated absorption while suppressing the decrease in the amount of body fluid absorbed due to the decrease in the strength of the absorber 12.

3A and 3B are a plan view and a cross-sectional view of the absorbent article 3 of the third embodiment. The absorbent article 3 is a modification of the absorbent article 1 and has the same configuration as the absorbent article 1 except that it has an absorbent body 12B instead of the absorbent body 12. In the absorbent article 3, each component having the same function as that of the absorbent article 1 is designated by the same reference numeral as that of the absorbent article 1, and the description thereof will be omitted.

The absorber 12B has a horizontal T-shaped plan view shape in which the T-shape is rotated 90 ° counterclockwise, and a pair of short side portions of the T-shape extend outward in both width directions in the rear region 8. It constitutes the ears 50 and 51. Further, the long side portion of the T-shape extends in the longitudinal direction from the center of the short side portion of the T-shape in the rear region 8 in the width direction through the urination region 7 toward the front region 6. Even with this configuration, the same effects as those of the absorbent articles 1 and 2 can be obtained. The plan view shape of the absorber 12B is a horizontal T shape in the present embodiment, but within each dimensional range of the above-mentioned absorber 12 (absorbent 12B), the short side of the horizontal T shape is an elliptical shape. , Elliptical shape, rectangular rounded quadrangle, etc. may be replaced, and the long side of the horizontal T shape is rounded to I-shaped, oval shape, elliptical shape, and rectangular square. It may be replaced with a shape such as a quadrangle with rounded corners.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the above embodiments, and various changes or improvements are made to the above embodiments. It is clear to those skilled in the art that is possible. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

Hereinafter, the present embodiment will be described in more detail with reference to Examples and Comparative Examples.

(Example 1)
Air-through non-woven fabric (basis weight 20 g / m ² ) as top sheet, breathable polyethylene film (basis weight 20 g / m 2) as back sheet, air-through non-woven fabric (basis weight 20 g / m ² ) as core wrap sheet, containing two layers of pulp Absorbent sheet (width direction dimension e: 70 mm) in which a highly absorbent polymer is supported between composite non-woven fabric sheets at a basis weight of 150 g / m ² , and hydroknit non-woven fabric (trade name, Kimberly Clark, USA) as a pulp-containing composite non-woven fabric sheet. company Ltd., by molding a mixture of the pulp to a polypropylene spunbonded nonwoven hydroentangled sheets, in the proportions indicated basis weight 40 g / m ²⁾ and the absorber to the fluff pulp and SAP and Table 1, located behind zone area A sheet-like material having a pair of ears extending outward in the width direction is used, and the dimensions a to e are shown in Table 1, and an absorbent sheet is formed between the core wrap sheet and the back sheet on the back sheet side. The absorbent article of Example 1 was prepared in the same manner as in FIG.

(Example 2)
Using the same material as in Example 1, an absorbent article of Example 2 having dimensions a to e shown in Table 1 and having the same structure as in FIG. 1 was prepared.

(Example 3)
Using the same material as in Example 1, in the central portion in the width direction of the absorber, an oval slit having a length dimension and a width dimension shown in Table 1 is formed from the rear region to the front region, and is shown in Table 1. The absorbent articles of Example 3 having dimensions a to e and having the same structure as in FIG. 2 were prepared.

(Comparative Example 1)
The absorbent article of Comparative Example 1 was prepared in the same manner as in Example 1 except that the absorbent sheet was not used.

(Comparative Example 2)
The absorbent article of Comparative Example 2 was produced in the same manner as in Example 1 except that the widthwise dimension b of the absorbent article was changed from 300 mm to 400 mm.

(Comparative Example 3)
An absorbent article of Comparative Example 3 was prepared in the same manner as in Comparative Example 1 except that the absorber was changed from an absorber provided with an ear portion to a straight type (rectangular) absorber having a width of 160 mm.

(sensory evaluation)
Using the pads, which are absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3, as inners of disposable diapers, 10 panelists who wear disposable diapers on a daily basis were asked to wear them overnight (10 hours), and after urination absorption. The following criteria were used to evaluate the discomfort when wearing the diaper and the feeling of leakage to the outside of the disposable diaper.
〇: When "there was almost no discomfort when wearing after absorption" and "there was almost no leakage to the outside of the disposable diaper" when 8 or more and 10 or less people △: "There was some discomfort when wearing after absorption" When "there was some leakage to the outside of the disposable diaper" was 5 or more and 7 or less. When

1, 2, 3 Absorbent article 6 Front area 7 Urinary area 8 Rear area 10 Top sheet 11 Back sheet 12, 12A, 12B Absorber 13A, 13B Core wrap sheet 14, 15, 16, 17 Absorption sheet 18 Solid gather 18a Solid Gathered sheet 18b Elastic elastic member 19 Fixing means 20 Fixing means 21 Slit 30 Composite non-woven fabric 31 Spunbonded non-woven fabric 32 Pulp fiber web 33 Contact surface or loose joint surface 34 Highly absorbent polymer holding space 35 Convex part 36 Concave part 37 Highly absorbent polymer 40 Concavo-convex part 50, 51 Ear part

Claims (9)

It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between them, and has a length of 400 mm or more in the longitudinal direction and a length of 140 mm in the width direction. The above-mentioned absorbent article
It has an anterior region that mainly contacts the wearer's abdomen, a urination region that mainly contacts the wearer's crotch, and a posterior region that mainly contacts the wearer's back.
The width of the posterior region is wider than the widths of the urination region and the anterior region, and is 200 mm or more and 350 mm or less.
The width of the absorber in the rear region is
It is wider than each width of the absorber in the urination area and the anterior area, and is 160 mm or more and 320 mm or less.
The ratio of the width of the front region to the width of the rear region (width of the front region: width of the rear region) is 140: 200 or more and 200: 350 or less, and the absorber width of the front region and the rear region. The ratio of the absorber width of is 125: 160 or more and 190: 340 or less (the absorber width in the front region: the absorber width in the rear region).
The absorber in the posterior region constitutes a pair of ears that extend outward on both sides in the width direction.
An absorption sheet arranged on the top sheet side and / or the back sheet side of the ear portion is provided.
The absorbent sheet includes a multi-layer pulp-containing composite non-woven fabric sheet and a highly absorbent polymer supported between the multi-layers thereof.
An absorbent article characterized in that the bending rigidity of the selvage portion is at least 5.0 gf · cm ^{2 / cm or more.} The pulp-containing composite non-woven fabric sheet contains a spunbonded nonwoven fabric and a pulp fiber web integrated on one surface of the spunbonded nonwoven fabric, and has a convex portion protruding toward the spunbonded nonwoven fabric in the thickness direction. The absorbent article according to claim 1, further comprising concave portions recessed on the web side of the pulp fiber in the thickness direction and uneven portions alternately provided in the surface direction in a predetermined pattern. The absorbent sheet is a highly absorbent polymer holding space in which the internal space of the convex portion of one of the pulp-containing composite non-woven fabric sheets and the internal space of the convex portion of the other pulp-containing composite non-woven fabric sheet face each other. One and the other pulp-containing so that the bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet and the bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet face each other. The absorbent article according to claim 2, wherein a composite non-woven fabric sheet is arranged, and the highly absorbent polymer is sealed in the highly absorbent polymer holding space. The absorbent article according to claim 2 or 3, wherein the concave portion is interposed between one said convex portion and another convex portion adjacent thereto and has a substantially groove-shaped cross-sectional view. The bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet and the bottom surface of the recess of the pulp-containing composite nonwoven fabric sheet are sealed in the highly absorbent polymer holding space. The absorbent article according to any one of claims 2 to 4, which is bonded to such an extent that the sex polymer is separated by swelling due to absorption of body fluid. The pattern of the uneven portion is a grid pattern, a wavy pattern, an Aicon pattern, a polka dot pattern, a scale pattern or a checkered pattern, or a pattern in which a plurality of polygons are arranged at equal intervals in the vertical and horizontal directions. The absorbent article according to any one of claims 2 to 5. The height of the inner space of the convex portion is 0.2mm or more 3.0mm or less, the area of the bottom surface of the convex portion is at 7 mm ² or more 95 mm ² or less, the opening area of the area ratio (the recess: the convex The absorbent article according to any one of claims 2 to 6, wherein the top surface area of the portion is 38:62 or more and 62:38 or less. The pulp-containing composite non-woven fabric sheet is a water flow entangled integrated product of the spunbonded nonwoven fabric and the pulp fiber web, and in the water flow entangled integrated product, at least a part of the pulp fibers constitutes the spunbonded nonwoven fabric. Includes said pulp fiber web entangled with fibers and / or other pulp fibers and fixed to one surface of the spunpond nonwoven fabric, and pulp fibers exposed outward from the other surface of the spunbonded nonwoven fabric. The absorbent article according to any one of claims 2 to 7. The absorbent article according to any one of claims 2 to 8, wherein the spunbonded non-woven fabric is a spunbonded non-woven fabric made of polypropylene.

Images