JP2022006518A - Absorbent article - Google Patents

Abstract

To provide an absorbent article including a highly absorbent sheet, giving excellent wearing feeling and fitting feeling, and excellent in diffusivity of body fluid and an absorption rate.SOLUTION: An absorbent article 50 comprises a top sheet 25, a back sheet 30 and an absorber 1. The absorber 1 includes a substrate nonwoven fabric 11 having a raising surface 11a and a non-raising surface 11b, super absorbent polymers 12 fastened and carried on the raising surface 11a, and a hydrophilic sheet 20 covering the raising surface 11a. The hydrophilic sheet 20 includes a pulp-containing nonwoven fabric having flexural rigidity of 0.02 gf cm2/cm or more, and wet strength of 10 N/50 mm or more. The absorber 1 is folded in three inward so that both end faces 1A, 1B in a width direction of the substrate nonwoven fabric 11 face each other at a non-skin side of the top sheet 25 with the non-raising surface 11b of a super absorbent sheet 10 arranged on the inner side. A dimension between both end faces 1A, 1B of the substrate nonwoven fabric 11 is 10% or more and 90% or less of a widthwise dimension of the absorber 1.SELECTED DRAWING: Figure 4

Description

The present invention relates to an absorbent article.

The absorbent article generally comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between them, and absorbs body fluid such as urine that has permeated the top sheet. Absorb and hold in the body. There are various types of absorbent articles, regardless of whether they are for adults or infants, depending on the application, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads.

Conventionally, as an absorber, it is common to use a fluff pulp and a super absorbent polymer (hereinafter, also referred to as “SAP”) in combination. However, for the purpose of further improving the wearing feeling, appearance, touch, etc. of the absorbent article, and further reducing the reversion of body fluids such as urine, the two non-woven fabrics were fixed with a hot melt adhesive between them. Various absorbent articles using a highly absorbent sheet containing SAP particles (hereinafter, also referred to as “SAP sheet”) as an absorber have been proposed.

In Patent Document 1, one surface is arranged in a stripe shape extending in the longitudinal direction between the first and second nonwoven fabrics, each of which is an adhesive coated surface, and the adhesive coated surfaces of the first and second nonwoven fabrics. A plurality of SAP layers are provided, and the adhesive is intermittently applied in the area facing the SAP layer on the adhesive-coated surface of the second nonwoven fabric, and the adhesive is directly opposed to each other on both sides in the width direction of the SAP layer without interposing the SAP layer. A SAP sheet to which an adhesive is continuously applied in the longitudinal direction is disclosed on each of the adhesive-applied surfaces of the first and second nonwoven fabrics.

In Patent Document 2, the absorber disposed between the top sheet and the back sheet includes first and second absorbers containing two non-woven fabrics and SAP particles arranged between them, respectively. The SAP sheet is disclosed in which the first and second absorbers arranged on one side and the other side in the width direction have first and second folds extending in the longitudinal direction, respectively, and the first and second folds face each other. ing. Further, Patent Document 2 further includes a third absorber containing two nonwoven fabrics and SAP particles arranged between them, and the third absorber is an absorbent arranged on the upper side of the first and second absorbers. Sexual articles are disclosed.

Japanese Unexamined Patent Publication No. 2006-158676 JP 2013-42882 (Claim 1, Claim 5)

Since the SAP sheet used in Patent Documents 1 and 2 and many other absorbent articles has poor compressibility in the thickness direction, the wearer feels the rugged and hard feel of the SAP particles and the cured product of the hot melt adhesive on the skin. It is easy to feel, the feeling of wearing and the fit are greatly reduced, and the feeling of discomfort when wearing is increased. Further, in many SAP sheets, by fixing SAP particles to a non-woven fabric with a hot melt adhesive, SAP particles are present at a high density on the surface thereof, and as a result, a space for the SAP particles to absorb body fluid and expand. Is reduced. Therefore, the conventional SAP sheet is not sufficiently satisfactory in terms of the diffusivity of the body fluid, the absorption rate (particularly, the absorption rate after repeated absorption), and the absorbability.

Further, the conventional SAP sheet is made of SAP and a non-woven fabric in order to reduce the thickness, and does not contain fluff pulp, so that there is a problem that wet back immediately after water absorption is poor. Also, if a paper sheet is used instead of the non-woven fabric, the tensile strength when wet is low, so the SAP sheet may be torn by body pressure after water absorption, causing SAP to leak to the outside of the absorbent article. I have a problem.

An object of the present invention is to provide an absorbent article having a highly absorbent sheet, having a good wearing feeling and a good fit, and having excellent diffusivity and absorption rate of body fluid.

As a result of diligent research to solve the above problems, the present inventor has a substrate nonwoven fabric having a raised surface and supporting a highly absorbent polymer between the raised fibers on the raised surface, and a predetermined bending stiffness and wet strength. A highly absorbent sheet is formed by combining a pulp-containing non-woven fabric as a hydrophilic sheet having a The present invention was completed. The present invention relates to the following absorbent articles.

(1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet.
The absorber is
A substrate nonwoven fabric having a raised surface and a non-raised surface and arranged so that the non-raised surface faces the top sheet.
A highly absorbent polymer fixedly supported between the raised fibers on the raised surface of the substrate nonwoven fabric, and
A highly absorbent sheet comprising the hydrophilic sheet covering the raised surface of the substrate nonwoven fabric is provided.
The hydrophilic sheet contains a pulp-containing non-woven fabric having a bending stiffness of 0.02 gf · cm ² / cm or more and a wet strength of 10 N / 50 mm or more.
The absorber has a three-dimensional shape in which the non-raised surface of the highly absorbent sheet is inside and both end faces in the width direction of the substrate nonwoven fabric are internally folded in three so as to face each other on the non-skin side of the top sheet. death,
An absorbent article in which the distance dimension between the widthwise both end faces of the substrate nonwoven fabric is 10% or more and 90% or less of the widthwise dimension of the absorber.
(2) The absorber has a groove portion having a slit space between both end faces in the width direction of the substrate non-woven fabric and a bottom surface having the non-raised surface, and the hydrophilic sheet has both ends in the width direction. The absorption of the above (1), which is stretched in the width direction so as to cover the slit space portion of the groove portion and overlap each other, and the overlapping width direction dimension is 5% or more and 50% or less of the width direction dimension of the absorber. Sex goods.
(3) The pulp-containing nonwoven fabric is the absorbent article according to (1) or (2) above, which has a basis weight of 30 g / m ² or more and 80 g / m ² or less.
(4) The substrate nonwoven fabric is an air-through nonwoven fabric, the basis weight of the air-through nonwoven fabric is 20 g / m ² or more and 80 g / m ² or less, and the thickness of the fibers constituting the air-through nonwoven fabric is 1.6 dtex or more and 14 dtex or less. An absorbent article according to any one of (1) to (3) above.
(5) The absorbent article according to any one of (1) to (4) above, wherein the basis weight of the highly absorbent polymer in the highly absorbent sheet is 150 g / m ² or more and 800 g / m ² or less.

According to the present invention, it is possible to provide an absorbent article having a highly absorbent sheet, having a good wearing feeling and a good fit, and having excellent diffusivity of body fluid and absorption rate.

It is a top view schematically showing the structure of the absorbent article which concerns on 1st Embodiment of this invention. It is a perspective view which shows typically the structure of the substrate nonwoven fabric in the absorbent article shown in FIG. It is a side view schematically showing the structure in which a highly absorbent polymer is fixedly supported on the substrate nonwoven fabric in the absorbent article shown in FIG. 1. It is a schematic cross-sectional view which shows the structure of the absorber in the absorbent article shown in FIG. It is a schematic cross-sectional view which shows the structure of the 2nd Embodiment of an absorber.

In the present specification, the wearing of the absorbent article means a state in which the absorbent article is attached to the body before and after the absorption of the body fluid. In the absorbent article, the longitudinal direction is the direction indicated by Y in the figure, which extends to the front and back of the body through the crotch portion of the wearer when the absorbent article is worn on the body, and the width direction is the longitudinal direction. The direction is orthogonal to each other and is indicated by X in the figure, and the thickness direction is the direction in which the constituent members are laminated and indicated by Z in the figure. 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 faces the clothes. be. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Absorbable article (first embodiment)>
Hereinafter, the absorbent article of the present embodiment will be described with reference to the drawings. FIG. 1 shows an absorbent article 50 according to the first embodiment. FIG. 2 shows the substrate nonwoven fabric 11. FIG. 3 shows a substrate nonwoven fabric 11 on which a highly absorbent polymer 12 is fixedly supported. 4 and 5 show absorbers 1 and 2, respectively. These drawings do not specify the shape, size, size relationship, etc. of each component in the absorbent article 50.

The absorbent article 50 of the present embodiment can be used as various absorbent articles regardless of whether it is for babies or adults, but typically, a light incontinence pad, a urine absorbing pad, a pants-type disposable diaper, a tape-stopping disposable diaper and the like are used. Can be mentioned. Various paper diapers as an outer and an absorbent article 50 as an inner may be combined. The lengthwise dimension and the widthwise dimension of the absorbent article 50 are not particularly limited, but are, for example, a range of 100 mm or more and 800 mm or less, and a range of 50 mm or more and 500 mm or less. By adjusting the dimensions of the absorbent article 50 to the above range, absorbent articles of various uses can be easily obtained.

As shown in FIG. 1, the absorbent article 50 is arranged so as to face the liquid-permeable top sheet 25, which is relatively close to the skin when worn, and the absorbent article 25. The liquid-impermeable back sheet 30 located relatively on the non-skin side when the 50 is worn, the absorber 1 arranged between the top sheet 25 and the back sheet 30, and the skin side of the top sheet 25. It includes a pair of three-dimensional gathers 40 provided on the surface. The absorber 1 has a structure sandwiched between the top sheet 25 and the back sheet 30, and body fluid such as urine is absorbed and held by the absorber 1 through the top sheet 25. Leg gathers, waist gathers, side flaps and the like can be appropriately provided depending on the use and type of the absorbent article 50.

In the absorbent article 50, the highly absorbent sheet 10 as the absorber 1 does not contain fluff pulp, has good absorption performance, and even if the body fluid is repeatedly absorbed, the absorption rate is lowered due to gel blocking of the highly absorbent polymer 12. Since it is unlikely to occur, it maintains a silky and comfortable feel, has a good fit and fit, does not cause discomfort while wearing, absorbs body fluids quickly, has excellent body fluid diffusivity, and has a high absorption rate. Will have. Further, the absorbent article 50 has a raised surface 11a, and includes a substrate nonwoven fabric 11 in which a highly absorbent polymer is fixedly supported on the raised surface 11a, and a pulp-containing nonwoven fabric having predetermined characteristics as a hydrophilic sheet 20. By providing the absorber 1 in which the absorbent sheet 10 is combined in a predetermined inner tri-fold structure, not only the liquid returns in the state of holding the body fluid but also the body fluid is sufficiently retained immediately after the wearer discharges the body fluid. It has the advantage that the liquid return is remarkably suppressed even in the non-woven fabric state.

Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in more detail in the order of the top sheet 25, the absorber 1, the back sheet 30, and the three-dimensional gather 40. In addition, these constituent members may have a three-dimensional structure other than a sheet shape and a plate shape.

(Top sheet)
The top sheet 25 is a liquid-permeable sheet-like member that allows body fluid to quickly pass toward the absorber 1, and is arranged so as to face the back sheet 30 with the absorber 1 interposed therebetween. Since the top sheet 25 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 sheet, a composite non-woven fabric which is a laminate of the same or different types of hydrophilic sheets, an open film such as an open polyethylene film, and a foamed film such as polyethylene foam and urethane foam. As the hydrophilic sheet, for example, a synthetic fiber made of a synthetic resin such as polypropylene or polyethylene, a recycled fiber such as rayon, a natural fiber such as cotton, etc. are used, and an air through method, a thermal bond method, a spunlace method, a spunbond method, etc. It is obtained by processing by a known method.

The surface of the top sheet 25 may be embossed or perforated according to a known method from the viewpoint of improving the liquid permeability. Further, from the viewpoint of reducing irritation to the skin, the top sheet 25 may contain one or more of lotions, antioxidants, anti-inflammatory components, pH regulators, antibacterial agents, moisturizers and the like. good.

From the viewpoint of strength, workability and liquid return amount, the basis weight of the top sheet 25 is, for example, in the range of 15 g / m ² or more and 40 g / m ² or less. The shape of the top sheet 25 is not particularly limited, and may be any shape that covers a part or all of the absorber 1 required for guiding the body fluid to the absorber 1 so as not to leak.

<First Embodiment of Absorber>
FIG. 4 is a schematic cross-sectional view showing the absorber 1. The absorber 1 is a three-dimensional object obtained by folding a highly absorbent sheet (hereinafter, also referred to as “SAP sheet”) 10 including a substrate nonwoven fabric 11 in which a highly absorbent polymer 12 is fixedly supported on a raised surface 11a and a hydrophilic sheet 20 in three. Has a structure. The substrate nonwoven fabric 11 has a raised surface 11a on one surface and a non-raised surface 11b on the other surface, and the highly absorbent polymer 12 is fixedly supported between the raised fibers 11x on the raised surface 11a of the substrate nonwoven fabric 11. In the highly absorbent sheet 10, the highly absorbent polymer 12 is dispersed and fixedly supported between the raised fibers 11x of the substrate nonwoven fabric 11, so that body fluids such as urine are appropriately diffused around the highly absorbent polymer 12 and quickly. It is retained, the absorption performance is improved, and sufficient absorption performance can be ensured even if it does not contain fluff pulp.

In the absorber 1 of the present embodiment, the highly absorbent sheet 10 in which the entire raised surface 11a of the substrate nonwoven fabric 11 is covered with the hydrophilic sheet 20 is folded in three with the non-raised surface 11b of the substrate nonwoven fabric 11 inside. Hereinafter referred to as "C-folding"), the cross-sectional view in the width direction has a three-dimensional shape in which the letter C is rotated 90 degrees to the left. In the absorber 1, a part of the non-raised surface 11a of the substrate nonwoven fabric 11 faces the top sheet 25, one end surface 1A in the width direction of the substrate nonwoven fabric 11, the other end surface 1B, and one in the width direction of the hydrophilic sheet 20. The end surface 20a and the other end surface 20b of the top sheet 25 face each other in the width direction on the non-woven fabric side of the top sheet 25, respectively. Here, one end face 1A and the other end face 1B in the width direction of the substrate nonwoven fabric 11 are covered with one end face 20a and the other end face 20b in the width direction of the hydrophilic sheet 20 and are not exposed to the top sheet 25. It is configured as follows.

Further, in the absorber 1 of the present embodiment, one end face 20a in the width direction of the hydrophilic sheet 20 and the other end face 20b face each other, and one end face 1A in the width direction of the substrate nonwoven fabric 11 and another. It has a groove portion 21 having a space facing each other of the end surface 1B as an opening and a non-raised surface 11b of the substrate nonwoven fabric 11 facing the top sheet 25 as a bottom surface portion. The groove 21 functions like a slit, for example, and cooperates with the top sheet 25 and the hydrophilic sheet 20 to form a diffusion layer so that the body fluid can be evenly distributed to the vicinity of both ends in the longitudinal direction of the absorber 1. can. As a result, the diffusibility of the body fluid in the absorber 1 and the absorption rate can be further increased, and the return of the body fluid to the top sheet 25 side can be reduced. Length dimension C between one end face 1A in the width direction of the substrate nonwoven fabric 11 and the other end face 1B (or between one end face 20a and the other end face 20b in the width direction of the hydrophilic sheet 20) (FIG. 4, opening of groove 21) The width dimension of the portion) is, for example, a range of 10% or more and 90% or less or a range of 15% or more and 35% or less of the width dimension D of the absorber 1. As a result, the absorption rate of the absorber 1 is further improved.

In the present embodiment, when the highly absorbent polymer 12 is fixedly supported between the raised fibers 11x on the raised surface 11a of the substrate nonwoven fabric 11, the high-yielding polymer 12 is supported by the raised surface 11a and the raised fibers 11x, and the highly absorbent polymer is supported. Since the dispersion of the 12 is easy, the amount of the hot melt adhesive used can be reduced, the high density of the high-absorbent polymer 12 is suppressed, and the high-absorbent polymer 12 is formed around the high-absorbent polymer 12. It can absorb body fluids and form an inflatable space. In addition, gel blocking in which highly absorbent polymers 12 that have absorbed and swollen body fluids are bound to each other is extremely unlikely to occur. As a result, the body fluid diffusibility of the absorber 1 as a whole and the body fluid absorption rate become high, and the stiff feeling derived from the hot melt adhesive is less likely to occur. Further, since the raised surface 11a of the substrate nonwoven fabric 11 which is a constituent member of the absorber 1 is covered with the pulp-containing nonwoven fabric as the hydrophilic sheet 20, the body fluid is uniformly distributed over the entire absorber 1 and the entire absorber 1 is provided. The highly absorbent polymer 12 distributed in the above can be used evenly to efficiently absorb body fluids. Therefore, the absorbent article 50 provided with the absorber 1 has high diffusivity and absorption rate of body fluid, is excellent in body fluid absorption, and has a good wearing feeling.

Further, in the present embodiment, since the substrate non-woven fabric 11 and the hydrophilic sheet 20 are C-folded, the cushioning property and the fit are further improved, a good wearing feeling can be obtained, and the substrate non-woven fabric 11 and the hydrophilic sheet 20 are fixedly supported on the raised surface 11a. The absorption layer of the highly absorbent polymer 12 is divided into two upper and lower layers, and the upper absorption layer has a groove 21 which is a slit and is excellent in body fluid diffusivity and body fluid absorption, and the lower absorption layer and the width direction in the C-folded state. Both ends are fixed supporting layers of the highly absorbent polymer 12 having excellent repeatability. According to such a configuration, it is possible to achieve both a fit and a feeling of wearing and an absorption rate at the time of repeated absorption at a high level, and it is possible to sufficiently prevent wet back immediately after the body fluid is discharged.

The absorber 1 of the present embodiment has dimensions in the longitudinal direction, for example, in the range of 100 mm or more and 800 mm or less, or in the range of 150 mm or more and 500 mm or less. Further, the dimension D in the width direction of the absorber 1 is, for example, a range of 50 mm or more and 500 mm or less, or a range of 60 mm or more and 400 mm or less. The entire surface or a part of the absorber 1 may be embossed.
The substrate nonwoven fabric 11, the highly absorbent polymer 12, and the hydrophilic sheet 20 constituting the highly absorbent sheet 10 of the absorber 1 are as follows in detail.

(Base non-woven fabric)
As shown in FIG. 2, the one-sided surface 11a of the substrate nonwoven fabric 11 is a raised fiber 11x in which the fibers constituting the substrate nonwoven fabric 11 are raised. Therefore, in addition to the original bulkiness of the non-woven fabric, by imparting an appropriate thickness and softness to the highly absorbent sheet 10, an appropriate cushioning property can be generated and a fit feeling when worn can be improved. Further, when the substrate nonwoven fabric 11 is raised as described above, the highly absorbent polymer 12 can be dispersed and fixedly supported between the raised fibers 11x of the substrate nonwoven fabric 11. Examples of the method for raising the one-sided surface 11a of the substrate nonwoven fabric 11 include a method using a rotary saw blade, a needle punch, and the like, and a method using a rotary saw blade is preferable from the viewpoint of in-line productivity and cost.

The raised state in the present embodiment is not particularly limited as long as the raised state can be visually confirmed, but more specifically, the raised rate of the substrate nonwoven fabric 11 is preferably 5% or more and 90% or less, and 8% or more and 80. % Or less is more preferable. The brushing rate means the rate of increase in the thickness of the substrate nonwoven fabric 11 due to the brushing process. For example, when the thickness of the base nonwoven fabric 11 before raising is T1 and the thickness of the substrate nonwoven fabric 11 after raising is T2, the raising rate (%) is expressed by [(T2-T1) / T1] × 100. Can be done. The above thickness is obtained by measuring the thickness under no load using a height gauge (manufactured by Mitutoyo Co., Ltd.). The other surface of the substrate nonwoven fabric 11 is a non-raised surface 11b in the present embodiment, but the present invention is not limited to this, and the fibers may be raised.

The substrate non-woven fabric 11 includes, for example, a non-woven fabric such as an air-through non-woven fabric, a point bond non-woven fabric, a spunbond non-woven fabric, and a melt-blow non-woven fabric, or a composite such as a spunbond non-woven fabric / melt-blow non-woven fabric laminate, a spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric laminate, and the like. Non-woven fabric and the like can be mentioned. Among these non-woven fabrics, air-through non-woven fabrics are preferable from the viewpoint of increasing the bulk.

The thickness of the substrate nonwoven fabric 11 is not particularly limited, but from the viewpoint of the balance between wearing feeling and absorption performance, a range of 0.3 mm or more and 11.0 mm or less, a range of 0.5 mm or more and 5.0 mm or less, or 0.5 mm or more 2 The range is 0.0 mm or less. The basis weight of the substrate nonwoven fabric 11 is not particularly limited, but is, for example, 20 g / m ² or more and 200 g / m ² or less, 20 g / m ² or more and 160 g / m ² or less, or 20 g / m ² or more and 80 g / g. The range is m ² or less.

When the air-through nonwoven fabric is used as the substrate nonwoven fabric 11, the basis weight of the air-through nonwoven fabric is in the range of 20 g / m ² or more and 80 g / m ² or less, and the thickness of the fibers constituting the air-through nonwoven fabric is in the range of 1.6 dtex or more and 14 dtex or less. The range is 1.8 dtex or more and 9.0 dtex or less, or 2.0 dtex or more and 6.0 dtex or less. By adjusting the thickness of the fibers constituting the air-through nonwoven fabric within the above range, the highly absorbent polymer 12 can be easily dispersed and fixedly supported between the raised fibers 11x of the air-through nonwoven fabric, and the highly absorbent polymer on the raised surface 11a can be easily fixed and supported. The uniform dispersibility of 12 is improved.

(Highly absorbent polymer)
The highly absorbent polymer 12 is not particularly limited as long as it can absorb urine and prevent backflow, and is a polyacrylic acid salt, a polyaspartate salt, a (starch / acrylic acid) graft copolymer, ( Examples thereof include a copolymer (acrylic acid / vinyl alcohol), a (isobutylene / maleic anhydride) copolymer, and a saponified product thereof. Among these, polyacrylic acid salt is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of absorption per weight. The basis weight of the highly absorbent polymer 12 on the raised surface 11a of the highly absorbent sheet 10 (or the substrate nonwoven fabric 11) is, for example, in the range of 150 g / m ² or more and 800 g / m ² or less.

Further, by avoiding the use of the highly absorbent polymer 12 as a fine powder having poor fluidity as a powder, the basic performance regarding absorption is enhanced, and the rugged tactile sensation generated by the hardening of the high absorbent sheet 10 is achieved. From the viewpoint of reducing the amount of particles, it is preferable to use the highly absorbent polymer 12 in the form of particles having a medium particle size as the highly absorbent polymer 12. The medium particle size is, for example, in the range of 50 μm or more and 600 μm or less, or 100 μm or more and 500 μm or less.

The highly absorbent polymer 12 is preferably fixedly supported between the raised fibers 11x on the raised surface 11a of the base nonwoven fabric 11 by a hot melt adhesive, and has high absorption when the basis weight of the substrate nonwoven fabric 11 is relatively low. Hot melt adhesives function particularly effectively to reinforce the fixation and support of the sex polymer 12. The content of the hot melt adhesive is, for example, in the range of 10 g / m ² or less from the viewpoint of not inhibiting the absorbability of the highly absorbent polymer 12 and not impairing the touch when worn. As the hot melt adhesive, one having a melting point of 100 ° C. or higher and 180 ° C. or lower can be used without particular limitation. Examples thereof include melt adhesives and olefin-based hot melt adhesives such as ethylene-vinyl acetate copolymers. As a method for applying the hot melt adhesive, known methods such as a curtain coat method in which the hot melt adhesive in a molten state is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which the hot melt adhesive is applied by a contact method can be used.

(Hydrophilic sheet)
As described above, the hydrophilic sheet 20 that covers the raised surface 11a on which the highly absorbent polymer 12 of the substrate nonwoven fabric 11 is fixedly supported by a C-fold structure has a bending stiffness (flexural rigidity) of 0.02 gf · cm ² / cm or more. Or 0.02 gf · cm ² / cm or more and 0.6 gf · cm ² / cm or less and the wet strength (tensile strength when wet) is 10 N / 50 mm or more or 10 N / 50 mm or more 70 N / Includes pulp-containing non-woven fabrics in the range of 50 mm or less. Here, the bending stiffness and the wet strength are values measured by the method described later.

When the bending stiffness of the hydrophilic sheet 20 is less than 0.02 gf · cm ² / cm and / or the wet strength is less than 10 N / 50 mm, the rigidity of the absorber 1 is lowered, and the body is repeatedly absorbed with body fluid or after the body fluid is absorbed. When it is removed from the absorber 1, the absorber 1 tends to be easily torn or the like. If the bending stiffness of the hydrophilic sheet 20 exceeds 0.6 gf · cm ² / cm and / or the wet strength exceeds 70 N / 50 mm, the absorber 1 becomes too hard and the absorbent article 50 is easy to wear and fits. There is a tendency for the feeling to decrease and for the feeling of discomfort when worn to increase.

By using the pulp-containing non-woven fabric having the above-mentioned range of bending stiffness and wet strength as the hydrophilic sheet 20, the absorber 1 is not too soft while maintaining the thinness, and has appropriate flexibility and rigidity. Not only the wearing feeling and fit are improved, but also the strength of the absorber 1 after absorbing the body fluid is increased, and when the absorbent article 50 is removed from the body during wearing or after absorbing the body fluid, the absorber 1 is torn, damaged, etc. Can be removed cleanly. Further, as described above, the absorber 1 has an appropriate rigidity, and even if the operating speed is increased at the time of production, tearing or the like is extremely unlikely to occur, so that the production efficiency and the yield can be improved. For the adhesion between the raised surface 11a of the substrate nonwoven fabric 11 and the hydrophilic sheet 20, for example, a hot melt adhesive, heat embossing, or the like can be used. By adhering the hydrophilic sheet 20 to the raised surface 11a of the substrate nonwoven fabric 11, it is possible to prevent the highly absorbent polymer 12 from leaking to the outside of the highly absorbent sheet 10, and it is possible to improve the feel when worn.

(Non-woven fabric containing pulp)
The pulp-containing nonwoven fabric used as the hydrophilic sheet 20 includes a nonwoven fabric and a pulp fiber web laminated on at least one surface of the nonwoven fabric (first embodiment of the pulp-containing nonwoven fabric). In the present embodiment, for example, the pulp fiber web that contributes to body fluid diffusivity in the absorber 1 faces the raised surface 11a of the substrate nonwoven fabric 11, and the nonwoven fabric that contributes to imparting strength to the absorber 1, for example, faces the outside. It is preferable that the pulp-containing non-woven fabric is arranged so as to face it.

A preferred pulp-containing nonwoven fabric comprises a nonwoven fabric and a pulp fiber web integrated on at least one surface of the nonwoven fabric (second embodiment of the pulp-containing nonwoven fabric). Here, "integration" means that at least before and after the use of the absorbent article, the nonwoven fabric and the pulp fiber web are partially peeled off and their functions are not significantly reduced. The basis weight of the non-woven fabric is, for example, 7 g / m ² or more and 30 g / m ² or less, and the basis weight of the pulp fiber web is, for example, 30 g / m ² or more and 50 g / m ² or less. By setting each basis weight of the nonwoven fabric and the pulp fiber web to the above range, it becomes easy to adjust the basis weight of the pulp-containing nonwoven fabric to an appropriate range described later.

Among the pulp-containing non-woven fabrics, an integrated product due to water flow confounding is preferable (the third embodiment of the pulp-containing non-woven fabric). The integrated product is, for example, a pulp-containing nonwoven fabric in which pulp fibers are entangled with a water jet on the surface of the nonwoven fabric without using a binder, and the pulp fiber web is provided integrally. In such a pulp-containing nonwoven fabric, the fibers constituting the nonwoven fabric and the pulp fibers are entangled on one surface of the nonwoven fabric to integrate the pulp fiber web, and a part of the pulp fibers penetrates the nonwoven fabric in the thickness direction to the other. The non-woven fabric and the pulp fiber web are extremely firmly bonded to each other (the fourth embodiment of the pulp-containing non-woven fabric).

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, slush pine, southern pine, lodge pole pine, spruce and Douglas-firs. .. NBKP can be used alone or in combination of two or more. The non-woven fabric laminated on the pulp fiber web is not particularly limited, but a spunbonded non-woven fabric composed of synthetic resin fibers is preferable from the viewpoint of the strength and liquid permeability of the entire pulp-containing non-woven fabric, and polypropylene is the synthetic resin fiber. A spunbonded nonwoven fabric containing fibers is more preferable, and a spunbonded nonwoven fabric made of polypropylene fibers is even more preferable.

In the pulp-containing non-woven fabric, the weight ratio between the non-woven fabric and the pulp fiber web (nonwoven fabric / pulp fiber web) is, for example, in the range of 40/60% by weight or more and 10/90% by weight or less. When the content of the pulp fiber web is less than 60% by mass, the pulp-containing nonwoven fabric tends to be poor in texture and absorption of sweat and tends to be stuffy, and when it exceeds 90% by mass, the pulp-containing nonwoven fabric tends to be hard. The nonwoven fabric integrated with the pulp fiber web is not particularly limited, but a spunbonded nonwoven fabric is preferable from the viewpoint of supportability to the pulp fiber web, strength and softness of the entire pulp-containing nonwoven fabric, texture, and the like. The spunbonded nonwoven fabric containing the above is more preferable, and the spunbonded nonwoven fabric made of polypropylene fiber is further preferable.

The basis weight of the pulp-containing non-woven fabric is, for example, in the range of 30 g / m ² or more and 80 g / m ² or less or 40 g / m ² or more and 60 g / m ² from the viewpoint of the thickness and strength of the product. If it is less than 30 g / m ² , the pulp-containing nonwoven fabric becomes too soft and the production yield tends to decrease, and at the same time, it tends to be easily torn after absorption of body fluid. If it exceeds 80 g / m ² , the pulp-containing nonwoven fabric increases in hardness and thickness. , The absorber 1 tends to become stiff and impair the comfort when worn.

The bending stiffness and wet strength of the pulp-containing nonwoven fabric can be adjusted to desired values by appropriately selecting, for example, the material, thickness, basis weight, weight ratio thereof, and the like of the pulp fiber web and the nonwoven fabric.

<Manufacturing method of absorber>
The method for producing the absorber 1 is not particularly limited, and examples thereof include the following methods. The surface of one side of the substrate nonwoven fabric 11 is raised using a rotary saw blade or a needle punch. Then, the highly absorbent polymer 12 is fixedly supported between the raised fibers 11x on the raised surface 11a of the substrate nonwoven fabric 11 with a hot melt adhesive or the like. After that, the raised surface 11a of the substrate nonwoven fabric 11 and the hydrophilic sheet 20 are adhered with a hot melt adhesive or the like, C-folded with the non-raised surface 11b inside, and one end surface 20a in the width direction of the hydrophilic sheet 20 and The other end face 20b, one end face 1A in the width direction of the substrate nonwoven fabric 11, and the other end face 1B are opposed to each other in the width direction on the non-skin side of the top sheet 25 to obtain the absorber 1. The C-fold fold may be configured to draw a smooth arc or may be configured to be angular.

<Second Embodiment of Absorber>
FIG. 5 is a schematic cross-sectional view showing the absorber 2. The absorber 2 is a modified example of the absorber 1. As the highly absorbent sheet 15 as the absorber 2, the same substrate nonwoven fabric 11 as the absorber 1, the highly absorbent polymer 12, and the hydrophilic sheet (pulp-containing nonwoven fabric) 20 are used, and the same as the highly absorbent sheet 10 is used. After the hydrophilic sheet 20 is bonded to the raised surface 11a of the substrate nonwoven fabric 11, the non-woven fabric 11 is folded C with the non-raised surface 11b inside, and one end surface 1A and the other end surface 1B in the width direction of the substrate nonwoven fabric 11 are folded. Is opposed to each other on the non-woven fabric side of the top sheet 25, and one end face 20a in the width direction of the hydrophilic sheet 20 and the other end face 20b are stretched in the width direction to form an overlapping region. The overlapping region is fixed by the adhesive layer 16, but the present invention is not limited to this, and the overlapping region may not be fixed. For the formation of the adhesive layer 16, for example, the above-mentioned hot melt adhesive can be used.

Further, although the opening of the absorber 2 is closed by the overlapping region of the hydrophilic sheet 20, one end surface 1A in the width direction of the substrate nonwoven fabric 11 and the other end surface 1B face each other in the width direction. It has a groove portion (or a hollow portion) 21 having a non-raised surface 11b of the substrate nonwoven fabric 11 as a bottom surface portion as a slit space portion. Since the hydrophilic sheet 20 that closes the opening of the groove 21 is excellent in body fluid permeability and body fluid diffusivity, the groove portion 21 cooperates with the hydrophilic sheet 20 and its overlapping region to enhance the uniform diffusivity of body fluid. , The repeated absorption rate is further improved. Further, as in the absorber 1, the substrate non-woven fabric 11 for improving cushioning property and fit is partially formed into two layers, so that the absorber 2 has a feeling of wearing and fitting in combination with the space of the groove portion 21. Will be very good.

The above-mentioned absorber 2 has the same longitudinal dimension and width dimension as the absorber 1, and can be manufactured in the same manner as the absorber 1. Further, in the absorbers 1 and 2, as shown in FIGS. 4 to 5, the creases of the C folds are formed in a curved shape so as to draw a smooth arc, but the creases are not limited to this and the folds are angular. It may be configured as follows. In the absorbent article 50 of the present embodiment, the absorber 2 can be used instead of the absorber 1.

(Back sheet)
The back sheet 30 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 1 does not wet the clothes, and the base material may be, for example, a resin film. Examples thereof include a composite sheet which is a laminate of a resin film and a non-woven fabric. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, and for example, spunbond non-woven fabric, melt-blow non-woven fabric, composite non-woven fabric which is a laminate of spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric. Examples thereof include a composite non-woven fabric which is a laminated body, and a composite material which is a laminated body of two or more of these. Examples of the resin film include films such as polyester, polyvinyl alcohol, polyethylene and polypropylene, and composite films of polyethylene and polypropylene.

The basis weight of the back sheet 30 is, for example, in the range of 15 g / m ² or more and 40 g / m ² or less in terms of strength and workability. Further, from the viewpoint of preventing stuffiness at the time of mounting, the back sheet 30 having breathability is preferable. In order to impart air permeability to the back sheet 30, for example, a method of blending a filler in the resin film, a method of embossing the back sheet 30 for perforation, and the like can be used. Here, examples of the filler include calcium carbonate, and the filler can be blended according to a known method.

(Three-dimensional gather)
As shown in FIG. 1, the absorbent article 50 has, for example, both end portions of the skin side surface of the top sheet 25 along the longitudinal direction of the absorbent article 50 in order to prevent lateral leakage of body fluid excreted by the user. A pair of three-dimensional gathers 40 are provided in the vicinity. In the three-dimensional gather 40 of the present embodiment, one end in the width direction is fixed near both ends of the skin side surface of the back sheet 30, and the middle portion in the width direction is fixed near both side ends of the skin side surface of the top sheet 25, and the width thereof is fixed. The other end 40a in the direction is a free end 40a that is not fixed to the top sheet 25. An elastic stretchable member (not shown) is arranged in the vicinity of the free end 40a along the longitudinal direction to give the free end 40a uprightness and to be deformable according to the wearer's body shape.

The fixing position of one end in the width direction of the three-dimensional gather 40 is not limited to the present embodiment, and for example, the vicinity of both ends in the width direction of the non-skin side surface of the back sheet 30, and each edge of the top sheet 25 and the back sheet 30 is partially or Examples thereof include the vicinity of both ends in the width direction of the bag body which is entirely joined and houses the absorber 1 inside, and the vicinity of both ends in the width direction of the skin side surface of the top sheet 25. The absorbent article of the present embodiment also includes an embodiment that does not include three-dimensional gathers.

As the sheet member constituting the three-dimensional gather 40, a water-repellent and / or liquid-impermeable nonwoven fabric formed of hydrophobic fibers can be used without particular limitation, and for example, a spunbonded nonwoven fabric, a melt blow nonwoven fabric, and a spunbonded nonwoven fabric / Examples thereof include a composite nonwoven fabric which is a laminate of melt blow nonwoven fabric / spunbonded nonwoven fabric. As the elastic elastic member, regular items in this field can be used without particular limitation, and examples thereof include polyurethane yarn, strip-shaped polyurethane film, thread-shaped or strip-shaped natural rubber, and the like.

(Transfer sheet)
In this embodiment, a transfer sheet (not shown) may be provided. The transfer is placed, for example, between the topsheet 25 and the absorber 1. The transfer sheet is not particularly limited as long as it is a liquid-permeable substrate, and is, for example, the same type or different types of non-woven fabrics such as air-through non-woven fabrics, thermal bonded non-woven fabrics, and spunbonded non-woven fabrics, and thermal-bonded non-woven fabrics / spunbonded non-woven fabric laminates. Examples thereof include a composite non-woven fabric in which non-woven fabrics are laminated, a foamed film made of urethane foam, polyethylene foam and 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 40. The basis weight of the transfer sheet is, for example, in the range of 20 g / m ² or more or in the range of 20 g / m ² or more and 60 g / m ² or less.

<Manufacturing method of absorbent articles>
The absorbent article 50 can be manufactured by a known manufacturing method. For example, a step of arranging the absorber 1 or the absorber 2 between the top sheet 25 and the back sheet 30, and the top sheet 25 and the back sheet 30 are included. A process of fixing using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference, and a process of installing a three-dimensional gather 40 at predetermined positions of the back sheet 30 and the top sheet 25. , A manufacturing method including. When the absorbent article 50 is a urine absorbing pad or a light incontinence pad, it may be individually wrapped in a package and then folded in three in the longitudinal direction. Further, leg gathers, waist gathers, side flaps and the like can be provided as needed.

Although the present invention has been described above with reference to the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. It is also clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

Hereinafter, the present embodiment will be described in detail with reference to Examples and Comparative Examples. The present embodiment is not limited to the examples shown below.

(Example 1)
First, an air-through non-woven fabric (basis weight 30 g / m ² , bending stiffness 0.018 gf · cm ² / cm, width direction dimension 90 mm, longitudinal dimension 300 mm) is prepared as the substrate non-woven fabric, and one side surface of the substrate non-woven fabric is surfaced with a rotary saw blade. It was physically raised (thickness after raising 1.2 mm, raising rate 25%). A highly absorbent polymer was dispersed between the fibers of the raised portion of the substrate nonwoven fabric (basis weight 300 g / m ² ), and fixed and supported by a hot melt adhesive. Further, a pulp-containing non-woven fabric (width direction dimension 140 mm, longitudinal direction dimension 300 mm) shown in Table 1 is prepared as a hydrophilic sheet, and a hot melt adhesive is applied to the raised surface side on which the highly absorbent polymer of the substrate non-woven fabric is fixedly supported. It was adhered to the hydrophilic sheet. Next, the hydrophilic sheet is folded in three, both ends of the hydrophilic sheet are overlapped above the non-raised surface of the substrate nonwoven fabric, the overlapped region is fixed with a hot melt adhesive, and the substrate nonwoven fabric is formed by the hydrophilic sheet. An absorber of Example 1 having the structure shown in FIG. 5 was obtained by covering the entire raised surface, both end faces in the width direction, and the entire non-brushed surface.

Next, an air-through non-woven fabric (basis weight 25 g / m ^{2) was used as the top sheet, an air-through non-woven fabric (basis weight 30 g / m 2 )} was used as the transfer sheet, and the absorber was used so that the brushed surface faced the back sheet side. A breathable polyethylene sheet (basis weight 30 g / m ² ) is used as a liquid-impermeable back sheet, and a composite non-woven fabric (basis weight 15 g / m 2) which is a laminate of spunbond non-woven fabric / melt blown non-woven fabric / spunbond non-woven fabric is used as a three-dimensional gather. Using m ² ), the absorbent article of Example 1 was prepared.

(Examples 2 to 4)
Absorbents and absorbent articles of Examples 2 to 4 were prepared in the same manner as in Example 1 except that the pulp-containing nonwoven fabric shown in Table 1 was used as the hydrophilic sheet.

(Example 5)
Using the pulp-containing non-woven fabric (dimensions 100 mm in the width direction) shown in Table 1 as the hydrophilic sheet, fold the hydrophilic sheet in three so that the left and right sides are folded 20 mm toward the center, leaving the central part 60 mm, and hot melt adhesive. An absorber and an absorbent article of Example 5 having the structure shown in FIG. 4 were produced in the same manner as in Example 1 except for fixing with. In this absorber, the non-raised surface of the substrate nonwoven fabric was exposed so as to extend in the longitudinal direction with a width of 20 mm at the central portion in the width direction of the substrate nonwoven fabric.

(Comparative Example 1)
Absorbents and absorbent articles were prepared in the same manner as in Example 1 except that the pulp-containing nonwoven fabric shown in Table 1 was used as the hydrophilic sheet.

(Comparative Example 2)
An absorber and an absorbent article of Comparative Example 2 were prepared in the same manner as in Example 1 except that the spunbonded nonwoven fabric shown in Table 1 was used as the hydrophilic sheet.

(Comparative Example 3)
An absorber and an absorbent article of Comparative Example 3 were prepared in the same manner as in Example 1 except that the crepe paper shown in Table 1 was used as the hydrophilic sheet.

(Comparative Example 4)
As the hydrophilic sheet, the pulp-containing non-woven fabric (dimensions of 60 mm in the width direction) shown in Table 1 was used, and the absorbent body of Comparative Example 4 was used in the same manner as in Example 1 except that the non-woven fabric was arranged in a plane without being folded in three. And absorbent articles were made.

(Comparative Example 5)
Air-through non-woven fabric (basis weight 25 g / m ² ) / high-absorbency polymer (basis weight 140 g / m ² ) / air-through non-woven fabric (basis weight 30 g / m ² ) / high-absorbent polymer (basis weight 140 g / m ² ) / span lace A 5-layer laminated sheet (all dimensions in the width direction are 60 mm) in which a non-woven fabric (basis weight 20 g / m ² ) is laminated is used as an absorber of Comparative Example 5, and the same top sheet and back sheet as in Example 1 are used. An absorbent article of Comparative Example 5 was prepared by interposing it between them. The non-woven fabric used in Comparative Example 5 was not brushed like the substrate non-woven fabric used in Example 1.

[Measurement item]
Using each absorber and each absorbent article obtained in Examples 1 to 5 and Comparative Examples 1 to 5, the thickness, the absorption rate, and the amount of reversion were measured, and the results are shown in Table 1.
(Thickness)
The thickness of the center of the absorber was measured under no load condition and under a load condition of 35 gf / cm ² .
(Absorption rate)
40 ml of 0.9 mass% physiological saline (37 ° C.) was poured into each of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 5 from a cylinder having an inner diameter of 30 mm under a pressure of 46 g / cm ² . The time (seconds) until the physiological saline is absorbed on the surface of the absorber is measured as the first absorption rate. After 3 minutes have passed, 40 ml of 0.9% by mass physiological saline (37 ° C.) is injected again, and the time (seconds) until the physiological saline is absorbed on the surface of the absorber is measured as the second absorption rate. The smaller the value, the better the absorbability.
(Amount of reversion)
100 ml of physiological saline was poured into each of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 5, and 90 seconds after the water was poured, the filter paper was pressure-bonded to the surface of the absorber under a load of 35 gf / cm ² . Measure the amount of water (wetback amount) that has returned to the filter paper in a minute. The smaller the amount of reversion, the drier the absorber.

Further, each of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 5 was subjected to an absorber tear evaluation, an operability evaluation, and a sensory evaluation, and evaluated according to the following evaluation criteria. The results are shown in Table 1.
(Evaluation of tearing absorber)
Each of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 5 was placed on a laboratory table, 100 ml of physiological saline was injected, and 10 minutes after the water was injected, using a 12 kg roller, 30 mm / sec. After reciprocating twice at a speed, the absorber in the absorbent article was confirmed.
〇: Absorber was not torn ×: Absorber was torn and SAP popped out (operability)
〇: Normal production was possible without slowing down the operation.
Δ: The speed of operation was 1% or more and 10% or less lower than usual.
X: The operating speed decreased by more than 10% as compared with the normal case.
(sensory evaluation)
Eight panelists were asked to wear each of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 5, and the wearing feeling (fitness, softness) and absorbency (presence or absence of leakage to the outside of the absorbent article). Was evaluated by sensory evaluation with two choices, "good" or "bad". The wearer used it for 8 hours and evaluated it in daily activities, and the results are shown in Table 1.
〇: When the number of wearers who chose "good" is 6 or more and 8 or less △: When the number of wearers who chose "good" is 3 or more and 5 or less ×: 1 wearer who chose "good" When there are one or two people, or when there is no wearer who chose "good"

The bending stiffness (flexural rigidity) and wet strength of each hydrophilic sheet were measured by the following methods.
(Bending stiffness)
Bending stiffness (flexural rigidity) was measured by inserting a sample (100 mm × 100 mm) into a fixed chuck and a moving chuck of a bending tester (trade name: KES-FB2, manufactured by Kato Tech Co., Ltd.). 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 complete the measurement with a curvature of 0. In this way, a reciprocating curve of the bending moment with respect to the curvature of one cycle is obtained. In the reciprocating curve of the bending moment, the average value of the slope between the curvatures 0.5 cm ^-1 and 1.5 cm ^-1 and the slope between the curvatures -0.5 cm ^-1 and -1.5 cm ^-1 was taken as the bending stiffness. ..
(Wet strength Wet tensile strength)
The wet strength (tensile strength at the time of wetting) was measured in the CD direction of each hydrophilic sheet based on the tensile test method of JIS8135.

1, 2 Absorbent 10, 15 Highly absorbent sheet 11 Base non-woven fabric 11a Raised surface 11b Non-raised surface 11x Raised fiber 1A, 1B End face (both ends in width direction of base non-woven fabric)
12 Highly absorbent polymer 16 Adhesive layer 20 Hydrophilic sheet 20a, 20b End faces (both end faces in the width direction of the hydrophilic sheet)
25 Top sheet 30 Back sheet 40 Three-dimensional gather 40a Free end of three-dimensional gather 50 Absorbable article

Claims (5)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet.
The absorber is
A substrate nonwoven fabric having a raised surface and a non-raised surface and arranged so that the non-raised surface faces the top sheet.
A highly absorbent polymer fixedly supported between the raised fibers on the raised surface of the substrate nonwoven fabric, and
A highly absorbent sheet comprising the hydrophilic sheet covering the raised surface of the substrate nonwoven fabric is provided.
The hydrophilic sheet is
It contains a pulp-containing non-woven fabric having a bending stiffness of 0.02 gf · cm ² / cm or more and a wet strength of 10 N / 50 mm or more.
The absorber has a three-dimensional shape in which the non-raised surface of the highly absorbent sheet is inside and both end faces in the width direction of the substrate nonwoven fabric are internally folded in three so as to face each other on the non-skin side of the top sheet. death,
An absorbent article in which the distance dimension between the widthwise both end faces of the substrate nonwoven fabric is 10% or more and 90% or less of the widthwise dimension of the absorber. The absorber has a groove portion having a slit space between both end faces in the width direction of the substrate non-woven fabric and a bottom surface having the non-raised surface, and the hydrophilic sheet has the groove portions at both ends in the width direction. The absorbent article according to claim 1, wherein the absorbent articles are stretched in the width direction so as to cover the slit space and overlap each other, and the overlapping width direction dimensions are 5% or more and 50% or less of the width direction dimensions of the absorber. .. The absorbent article according to claim 1 or 2, wherein the pulp-containing nonwoven fabric has a basis weight of 30 g / m ² or more and 80 g / m ² or less. The substrate nonwoven fabric is an air-through nonwoven fabric, the basis weight of the air-through nonwoven fabric is 20 g / m ² or more and 80 g / m ² or less, and the thickness of the fibers constituting the air-through nonwoven fabric is 1.6 dtex or more and 14 dtex or less. , The absorbent article according to any one of claims 1 to 3. The absorbent article according to any one of claims 1 to 4, wherein the highly absorbent polymer has a basis weight of 150 g / m ² or more and 800 g / m ² or less in the highly absorbent sheet.

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