JP2022019135A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which is thin, can suppress reduction of an absorption rate in repeated absorption, can suppress an amount of reverse return, is excellent in diffusion of body fluid, and has an absorber excellent in absorbency and wearing feeling.SOLUTION: An absorbent article 50 comprises: a liquid permeable top sheet 10; a liquid impermeable back sheet 30; and an absorber 20 which is arranged therebetween and includes no fluff pulp. The absorber 20 has a high absorbent sheet 25, and a hydrophilic sheet 24 wrapping a part or whole part of the high absorbent sheet. The high absorbent sheet 25 comprises: a polyurethane continuous porous body sheet 21 provided on a skin side of a wearer; a composite type nonwoven fabric 22 which is provided on a non-skin side of the wearer, and is formed by laminating a pulp fiber web on a spunbonded nonwoven fabric and integrating them; a junction 23 which is provided therebetween, and divides a space therebetween into a plurality of independent block-shaped closed spaces 27; and high absorbent polymers 12 encapsulated in the plurality of block-shaped closed spaces 27.SELECTED DRAWING: Figure 2

Description

The present invention relates to an absorbent article.

Generally, the absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet. In recent years, as an absorbent article, there has been a demand for a product in which it is not noticeable that the absorbent article is worn, and there is no discomfort when wearing the product, and there is no feeling of wearing the absorbent article. In order to meet such demands, many absorbent articles using a thin absorber have been proposed.

Patent Document 1 includes a second sheet arranged between the top sheet and the absorber, the absorber has a density higher than 0.12 g / cm ³ , and the second sheet has a density of 1.5 × 10 ³ N or more. An absorbent article having a capillary force is disclosed. In Patent Document 1, by optimizing the density of the absorber and the capillary force of the second sheet, both the thinness of the absorber and the excellent absorbency are achieved at a high level, and the wearing feeling is safe and comfortable. Can be given, it is stated.

Patent Document 2 has an upper absorbent layer composed of a non-woven fabric and a highly absorbent polymer, and a lower absorbent layer composed of a hydrophilic porous body and a highly absorbent polymer, and has a lower absorbent layer. Discloses an absorbent article in which the lower absorbent layer is substantially vertically elongated and the distribution amount of the highly absorbent polymer is smaller in the central portion in the width direction of the lower absorbent layer than in other parts of the lower absorbent layer. In Patent Document 2, a hydrophilic porous body is used for the lower absorption layer, and the distribution of the highly absorbent polymer is optimized to maintain high body fluid diffusivity and liquid retention, while reducing the thickness and reducing the absorption rate. It is stated that it can be made faster.

In Patent Document 3, as an absorber using a urethane foam, a base material layer having a first surface and a second surface, a highly absorbent polymer material layer having a first surface and a second surface, and a first surface are described. It has an adhesive layer with a surface and a second surface, the highly absorbent polymer material layer is contained between the adhesive layer and the substrate layer, and the second surface of the highly absorbent polymer material layer is the substrate. An absorbent core is disclosed in which the first surface of the highly absorbent polymer material layer contacts the first surface of the layer, the first surface of the highly absorbent polymer material layer contacts the second surface of the adhesive layer, and the substrate layer comprises a foam material layer. In Patent Document 3, by incorporating a foam layer having a highly absorbent polymer material layer in a layer stably attached on the base material layer, the fit is good and comfortable, and the utilization rate of the core absorption capacity is utilized. It is stated that it can be maintained.

Patent Document 4 comprises a plastic foam layer and / or a latex foam layer (hereinafter collectively referred to as "foam layer") and highly absorbent polymer particles that absorb an aqueous liquid, and a predetermined amount thereof. The highly absorbent polymer particles of the above, below, or between the foam layers are arranged in a plane direction, and the layered body in which the quantitative ratio of the foam layer: the highly absorbent polymer is 1: 500 to 50: 1 is the absorber. It is disclosed as. Patent Document 4 describes that the above-mentioned configuration improves the absorption performance of the layered body against an aqueous liquid, particularly the absorption performance under a load.

Japanese Unexamined Patent Publication No. 2016-67897 Japanese Unexamined Patent Publication No. 2009-131349 Japanese Unexamined Patent Publication No. 2014-140770 Special Table No. 09-509909

When designing a thin absorbent article, it is usually considered to reduce the thickness of the absorber, which occupies most of the absorbent article. On the other hand, if the absorbers of Patent Documents 1 to 4 are made thinner and lighter while maintaining the above-mentioned configurations, the absorption performance must be sacrificed to some extent. In particular, light incontinence products and urine absorbing pads with a narrow absorber area do not maintain sufficient absorption performance. In addition, the speed of body fluid absorption and the small amount of reversion are both important as indicators of absorption performance, but it is difficult for a conventional thin absorber to satisfy both at a high level.

INDUSTRIAL APPLICABILITY The present invention provides an absorbent article having an absorbent body which is thin, does not decrease the absorption rate during repeated absorption, has a small amount of reversion, is excellent in diffusion of body fluid, and has good absorbency and wearing comfort. The purpose.

As a result of diligent research to solve the above problems, the present inventor has obtained a polyurethane continuous porous body sheet, a composite non-woven fabric in which a pulp fiber web is laminated and integrated on a spunbonded non-woven fabric, and a highly absorbent polymer. By forming a thin absorbent body using particles, it has been found that an absorbent article satisfying a purpose can be obtained, and the present invention has been completed. That is, the present invention relates to the following absorbent article provided with a thin absorber.

(1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between them and containing no fluff pulp.
The absorber comprises a highly absorbent sheet and a hydrophilic sheet that wraps at least a portion of the highly absorbent sheet.
The highly absorbent sheet is
Polyurethane continuous porous body sheet located on the skin side of the wearer,
A composite non-woven fabric of the polyurethane continuous porous body sheet, which is arranged to face the non-skin side of the wearer and has a pulp fiber web laminated and integrated on a spunbonded non-woven fabric.
A joint portion that is interposed between the polyurethane continuous porous body sheet and the composite non-woven fabric and divides the space between them into a plurality of independent block-shaped closed spaces.
An absorbent article comprising a plurality of highly absorbent polymers encapsulated in the block-shaped closed space.
(2) The polyurethane continuous porous body sheet has a basis weight of 30 g / m ² or more and 300 g / m ² or less, and an apparent density of 100 kg / m ³ or more and 200 kg / m ³ or less. Absorbent article.
(3) The polyurethane continuous porous body sheet is the absorbent article according to (1) or (2) above, wherein the skeleton surface is hydrophilic.
(4) In the tensile test of the composite nonwoven fabric with Tensilon, the tensile strength required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. , The absorbent article according to any one of (1) to (3) above.
(5) The spunbonded nonwoven fabric contains fibers made of one or two synthetic resins selected from the group consisting of nylon, vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene (1) to the above. An absorbent article according to any one of (4).
(6) The absorbent article according to any one of (1) to (5) above, wherein the composite nonwoven fabric is an integral product of the spunbonded nonwoven fabric and the pulp fiber web by water flow entanglement treatment.
(7) The water flow entanglement treatment is carried out by injecting water jets from a plurality of water jet nozzles arranged linearly at predetermined intervals, and the hole diameter Φ of the water jet nozzles is 0.06 mm or more. The absorbent article according to (6) above, which is 0.15 mm or less and the distance between the water jet nozzles is 0.4 mm or more and 1.0 mm or less.
(8) The absorbent article according to any one of (1) to (7) above, wherein the composite nonwoven fabric is arranged so that the surface of the pulp fiber web is in contact with the highly absorbent polymer.
(9) The absorbent article according to any one of (1) to (8) above, wherein the basis weight of the highly absorbent polymer in the highly absorbent sheet is 30 g / m ² or more and 300 g / m ² or less.

According to the present invention, there is provided an absorbent article having a thin absorbent body which does not decrease the absorption rate during repeated absorption, has a small amount of reversion, is excellent in diffusion of body fluid, and has good absorbency and wearing comfort.

It is a schematic plan view which shows the structure of the absorbent article which concerns on 1st Embodiment of this invention. It is _a schematic cross-sectional view in the width direction in the X1 _- X1 cutting line shown in FIG. It is _a schematic cross-sectional view in the longitudinal direction in the Y1 _- Y1 cutting line shown in FIG. It is a schematic cross-sectional view which shows the structure of a highly absorbent sheet precursor. It is a schematic sectional drawing which shows the structure of the absorbent article which concerns on 2nd Embodiment of this invention. It is a cross-sectional view in the width direction which shows the structure of the absorbent article which concerns on Comparative Example 1. It is a cross-sectional view in the width direction which shows the structure of the absorbent article which concerns on Comparative Example 2. FIG. It is a cross-sectional view in the width direction which shows the structure of the absorbent article which concerns on Comparative Example 3. FIG.

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 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 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 50 of the present embodiment will be described with reference to the drawings. 1 to 3 show the absorbent article 50 according to the first embodiment. FIG. 4 shows a precursor 25A of the highly absorbent sheet 25 before forming the joint portion 23. In addition, in FIG. 1, in order to clarify the structure of the highly absorbent sheet 25, it is intentionally shown by a solid line. Further, these drawings do not specify the shape, size, size relationship, etc. of each constituent member 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, and examples thereof include light incontinence products, urine absorbing pads, pants-type disposable diapers, and tape-stopping disposable diapers. Among these, it is preferable to use it as a light incontinence product, a urine absorption pad, or the like. 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 FIGS. 1 and 2, the absorbent article 50 faces the liquid-permeable top sheet 10 and the top sheet 10 which are relatively located on the skin side of the wearer when worn. An absorbent body arranged between the top sheet 10 and the back sheet 30 and a liquid-impermeable back sheet 30 located relatively on the non-skin side of the wearer when the absorbent article 50 is worn. 20 and a pair of three-dimensional gathers 40 provided on the skin-side surface of the top sheet 10. The absorber 20 has a structure sandwiched between the top sheet 10 and the back sheet 30, and body fluid such as urine is absorbed and held by the absorber 20 through the top sheet 10. Leg gathers, waist gathers, side flaps and the like can be appropriately provided depending on the use and type of the absorbent article 50.

According to the present embodiment, the polyurethane continuous porous body sheet 21 arranged on the skin side of the wearer and the composite non-woven fabric (pulp fiber web are laminated on the spunbonded non-woven fabric) arranged on the non-skin side of the wearer. A high-absorbency sheet 25 partially bonded at the joint portion 23 is provided between the layers with the integrated non-woven fabric) 22 so that a plurality of block-shaped closed spaces 27 capable of encapsulating the high-absorbency polymer 12 are formed. Moreover, it is provided as an absorber 20 in which a part or all of the highly absorbent sheet 25 is covered with the hydrophilic sheet 24. The absorber 20 does not decrease in absorption rate during repeated absorption and is excellent in diffusivity of body fluid.

More specifically, the absorber 20 is
First, since the polyurethane continuous porous body sheet 21 located on the skin side of the wearer contains many pores and has a structure rich in flexibility and elasticity, the hardness and body fluid of the superabsorbent polymer 12 itself It is hard to feel the hardness after swelling that has absorbed
Secondly, when the pulp fiber web of the composite non-woven fabric 22 located on the non-skin side of the wearer is configured to be in contact with the highly absorbent polymer 12, the pulp fiber web (particularly the pulp integrated by water flow entanglement) is used. The fiber web) is rich in unevenness, and the highly absorbent polymer 12 is arranged in the block-shaped closed space 27. As a result, the highly absorbent polymer 12 is suppressed from shifting and moving, and the thickness and tactile sensation are maintained even after absorption of body fluid. Since it can be kept more uniform in the longitudinal direction and the width direction, the wearing feeling is improved.
Thirdly, since the pulp fiber web of the composite nonwoven fabric 22 has a function of temporarily holding the body fluid, it is possible to remarkably prevent the body fluid from retreating.
Fourth, both the polyurethane continuous porous body sheet 21 and the composite type non-woven fabric 22 are rich in body fluid diffusivity, and as described above, the highly absorbent polymer 12 is less likely to shift or move, resulting in the highly absorbent polymer 12. Gel blocking due to body fluid absorption is unlikely to occur, and since almost all of the highly absorbent polymers 12 in the high absorbency sheet 25 are used for body fluid absorption, the body fluid absorption rate at the time of initial absorption is maintained even during repeated absorption. However, it has an absorption capacity that can handle multiple discharges of body fluids.
Therefore, the absorbent article 50 including the absorber 20 of the present embodiment has excellent body fluid diffusivity while being thin, has a good wearing feeling before and after body fluid absorption, and absorbs even after a plurality of body fluid absorptions. High levels of rate and absorption are maintained and fluid regurgitation is highly prevented.

Hereinafter, each sheet-shaped component will be described in more detail in the order of the top sheet 10, the absorber 20, the back sheet 30, and the three-dimensional gather 40. In addition, these constituent members may have a three-dimensional structure other than the sheet shape.

(Top sheet)
The top sheet 10 is a liquid-permeable sheet-like member that allows body fluid to quickly pass toward the absorber 20, and is arranged so as to face the back sheet 30 with the absorber 20 interposed therebetween. Since the top sheet 10 may come into contact with the wearer's skin, a base material having a soft feel and a property of not irritating 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. Examples of the hydrophilic sheet include air-through non-woven fabrics, thermal bond non-woven fabrics, and spunlaced non-woven fabrics made of synthetic fibers made of synthetic resins such as polypropylene and polyethylene, recycled fibers such as rayon, and natural fibers such as cotton. Examples thereof include non-woven fabrics such as spunbonded non-woven fabrics.

The surface of the top sheet 10 may be embossed or perforated according to a known method from the viewpoint of improving liquid permeability. Further, from the viewpoint of reducing irritation to the skin, the top sheet 10 may contain one or more of lotions, antioxidants, anti-inflammatory components, pH regulators, antibacterial agents, moisturizers and the like. good. The basis weight of the top sheet 10 is, for example, in the range of 18 g / m ² or more and 400 g / m ² or less from the viewpoint of strength, workability and liquid return amount. The shape of the top sheet 10 is not particularly limited, and may be any shape that covers a part or all of the absorber 20 required for guiding the body fluid to the absorber 20 so as not to leak.

(Absorber)
The length of the absorber 20 of the present embodiment is, for example, a range of 100 mm or more and 800 mm or less, a range of 150 mm or more and 500 mm or less, or a range of 270 mm or more and 500 mm or less. The widthwise dimension of the absorber 20 is, for example, a range of 50 mm or more and 500 mm or less, a range of 60 mm or more and 400 mm or less, or a range of 90 mm or more and 190 mm or less. When the plan view shape of the absorber 20 is an hourglass shape, the longitudinal dimension is in the range of 180 mm or more and 480 mm or less, and the widthwise dimension of the ventral and dorsal portions that abut on the wearer's abdomen and back, respectively. Both are in the range of 60 mm or more and 160 mm or less, and the widthwise dimension of the crotch portion in contact with the crotch portion of the wearer is in the range of 50 mm or more and 140 mm or less. Further, the thickness dimension of the absorber 20 can be made thin, for example, in the range of 1 mm or more and 5 mm or less by adopting the configuration described later. The entire surface or a part of the absorber 20 may be embossed. Examples of the plan view shape of the absorber 20 include an hourglass shape, an I-shape, a rectangle, a quadrangle with rounded corners, an oval, and the like.

As shown in FIGS. 2 to 4, the absorber 20 includes a highly absorbent sheet 25 and a hydrophilic sheet 24 that encloses the entire high absorbent sheet 25. In the present embodiment, the hydrophilic sheet 24 is folded inward from the non-skin side surface of the highly absorbent sheet 25 (hereinafter, also referred to as “C fold”), and the periphery of both ends in the width direction is the skin side of the highly absorbent sheet 25. It is configured to cover the skin side surface, the non-skin side surface, and both end faces in the width direction of the highly absorbent sheet 25 so as to wrap the entire high absorbent sheet 25. With such a configuration, for example, the body fluid that has permeated through the top sheet 10 spreads almost uniformly over the entire area of the highly absorbent sheet 25, and the body fluid diffusibility is improved.

(Highly absorbent sheet)
The highly absorbent sheet 25 faces the polyurethane continuous porous body sheet 21 relatively located on the wearer's skin side and the polyurethane continuous porous body sheet 21 when the absorbent article 50 is worn on the body. Partially intervenes between the polyurethane continuous porous sheet 21 and the composite non-woven fabric 22 and the composite non-woven fabric 22 which is arranged on the non-woven fabric side of the wearer and is relatively located on the non-skin side of the wearer. 1. It is a seed. The high-absorbent sheet 25 mainly encloses the high-absorbent polymer 12 in a plurality of block-shaped closed spaces 27, and gel blocking of the high-absorbent polymer 12 which contributes to a decrease in body fluid diffusivity and absorption rate is extremely high. It has the characteristic that it is unlikely to occur. By combining this highly absorbent sheet 25 with the improvement of body fluid diffusivity by the hydrophilic sheet 24, the above-mentioned excellent effect can be obtained for the first time.

In the highly absorbent sheet 25 of the present embodiment, the space between the polyurethane continuous porous sheet 21 and the composite nonwoven fabric 22 is divided into a plurality of block-shaped closed spaces 27 by the joint portion 23. The joint portion 23 partially intervenes between the polyurethane continuous porous body sheet 21 and the composite nonwoven fabric 22, and joins the two. The joint portion 23 of the present embodiment has a plan-view strip-like shape, is provided along the four peripheral edges of the high-absorbency sheet 25, and further, from one edge in the width direction of the high-absorbency sheet 25 to another. A plurality of widthwise transverse joints 23 extending substantially parallel to the edges and substantially linearly at regular intervals are provided. The widthwise transverse joint portion 23 is not limited to the three in the present embodiment, and may be one, two, or four or more. Further, the present invention is not limited to the widthwise transverse type joint portion 23, and one or a plurality of longitudinal direction transverse type joint portions 23 may be provided, and the widthwise transverse type joint portion 23 and the longitudinal direction transverse type joint portion 23 may be provided. Both may be provided, one or a plurality of diagonally transverse joint portions 23 may be provided, and the annular joint portions 23 may be provided concentrically. Here, the diagonal direction is a direction that intersects both the width direction and the longitudinal direction.

The width of the joint portion 23 is not particularly limited and can be appropriately selected from a wide range according to the width direction and the longitudinal direction of the high absorption sheet 25, but from the viewpoint of the airtightness of the block-shaped closed space 27, etc. For example, the range is 1 mm or more and 10 mm or less. By selecting the width of the joint portion 23 from the above range, the airtightness of the block-shaped closed space 27 is well maintained until the end of use of the absorbent article 50, and the absorption performance such as absorption rate and absorption amount and the wearing feeling are maintained. Etc. are maintained well. If the width of the joint portion 23 is less than 1 mm, the airtightness of the block-shaped closed space 27 is impaired due to swelling due to body fluid absorption of the highly absorbent polymer 12 and unexpected external force being applied to the absorbent article 50. As a result, the absorption performance of the highly absorbent sheet 25 tends to deteriorate. When the width of the joint portion 23 exceeds 10 mm, the swellable volume of the highly absorbent polymer 12 in the block-shaped closed space 27 decreases, and the capacity or basis weight of the highly absorbent polymer 12 decreases. There is a tendency that sufficient absorption performance cannot be obtained.

The joint portion 23 can be formed, for example, by subjecting a predetermined portion of the precursor 25A of the highly absorbent sheet 25 shown in FIG. 4 to heat welding, ultrasonic welding, or the like. Here, the precursor 25A of the highly absorbent sheet 25 is formed by sandwiching the highly absorbent polymer 12 between the polyurethane continuous porous sheet 21 and the composite nonwoven fabric 22 at a predetermined basis weight. Further, the joint portion 23 may be formed at a predetermined portion of the precursor 25A having a size larger than that of the high absorbency sheet 25 and then cut along the joint portion 23 to obtain a highly absorbent sheet 25 having a desired size. Further, the joint portion 23 can also be heated or pressurized by arranging a hot melt adhesive in the region where the joint portion is planned to be formed between the polyurethane continuous porous body sheet 21 of the precursor 25A and the composite nonwoven fabric 22. Can be formed.

Inside the highly absorbent sheet 25, a plurality of independent block-shaped closed spaces 27 are formed, which are surrounded by the polyurethane continuous porous sheet 21, the composite nonwoven fabric 22, and the joints 23 arranged around the polyurethane continuous porous sheet 21. Has been done. The closed space 27 has a form such as an internal space and a gap. Further, the closed space 27 may have a form in which the polyurethane continuous porous body sheet 21 and the composite nonwoven fabric 22 are not joined and partially or wholly overlap each other. A predetermined amount of the highly absorbent polymer 12 is enclosed in each closed space 27. A part or all of the highly absorbent polymer 12 may be fixed to the polyurethane continuous porous sheet 21 and / or the composite nonwoven fabric 22 by a hot melt adhesive in each closed space 27. By enclosing the highly absorbent polymer 12 in the block-shaped closed space 27, the effect of the pulp fiber web of the composite nonwoven fabric 22 described later is also combined, and the highly absorbent polymer 12 is displaced, moved, and from the highly absorbent sheet 25. It is possible to suppress dropout and prevent deterioration of absorption performance due to gel blocking.

In the present embodiment, block-shaped closed spaces 27 having substantially the same shape and having substantially the same dimensions in a plan view are arranged, but the present invention is not limited to this, and a plane having two or more different shapes and / or different dimensions. A block-shaped closed space 27 having a visual shape may be arranged. At this time, the plan view shape of the block-shaped closed space 27 is not particularly limited, and examples thereof include a square shape, a rectangular shape, a rhombus shape, a parallel quadrilateral shape, and a polygonal shape having a triangle or more.

(Polyurethane continuous porous body sheet)
The polyurethane continuous porous body sheet 21 is a liquid permeable sheet containing a flexible polyurethane foam (hereinafter, also simply referred to as “soft polyurethane foam”) which is an open cell foam. As a specific example of the polyurethane continuous porous body sheet 21, from the viewpoint of imparting various properties such as flexibility and elasticity of polyurethane to the highly absorbent sheet 25, for example, it contains 50% by mass or more of flexible polyurethane foam. Sheets, sheets made of flexible polyurethane foams, composite sheets formed by dispersing particles and / or fibers of flexible polyurethane foams in other synthetic resins, particles and / or fibers made of flexible polyurethane foams, non-woven fabrics, knitted fabrics, textiles. Examples thereof include composite sheets mixed in textile products such as. The sheet made of flexible polyurethane foam includes a foamed sheet obtained by simultaneously or continuously performing polyurethane synthesis, open cell foaming and molding. Among these, the above-mentioned foamed sheet is preferable.

The flexible polyurethane foam is prepared by mixing, for example, a raw material compound such as a polyol or polyisocyanate, an additive such as a foaming agent, a foaming agent, or a catalyst, and heating the obtained mixture to foam according to a known production method. Can be obtained by Further, a gas-based foaming agent may be injected while reacting the raw material compound under heating. By appropriately selecting reaction conditions such as the type of raw material compound, the type and amount of additives added, the heating temperature during foaming, the foaming time, and the pressing force during foaming, the foaming ratio, apparent density, tensile strength, tensile elongation at break, Each characteristic such as elongation stress, average friction coefficient, and friction coefficient fluctuation can be adjusted.

The foaming ratio of the flexible polyurethane foam is, for example, in the range of 10 times or more and 60 times or less. The flexible polyurethane foam having such a foaming ratio is rich in flexibility and elasticity, has a good fit, and further absorbs body fluids and swells even if the highly absorbent sheet 25 is thinned in order to make it thinner. The rugged feeling of the highly absorbent polymer 12 can be alleviated, and the wearing feeling of the absorbent article 50 can be improved.

The basis weight of the polyurethane continuous porous body sheet 21 is not particularly limited, but from the viewpoints of achieving both liquid permeability, flexibility, elasticity, etc. at a high level, improving breathability, and reducing stuffiness. From, for example, the range is 30 g / m ² or more and 300 g / m ² or less, or 50 g / m ² or more and 250 g / m ² or less. The apparent density of the polyurethane continuous porous sheet 21 is not particularly limited, but is, for example, 100 kg from the viewpoints of weight reduction and fit of the absorbent article 50, imparting mechanical strength to the highly absorbent sheet 25, and the like. It is in the range of / m ³ or more and 200 kg / m ³ or less, or 120 kg / m ³ or more and 180 kg / m ³ or less.

The thickness of the polyurethane continuous porous body sheet 21 is, for example, in the range of 1.0 mm or more and 4.0 mm or less, or 1.5 mm or more and 3.2 mm or less. By setting the thickness within the above range, it is possible to achieve both the body fluid diffusivity and rigidity of the highly absorbent sheet 25 and the wearing feeling and fitting feeling of the absorbent article 50 at a high level and in a well-balanced manner. The thickness can be measured under no-load conditions using, for example, a height gauge (manufactured by Mitutoyo Co., Ltd.).

In a preferred embodiment, for example, in order to further improve the body fluid diffusivity of the highly absorbent sheet 25, the flexible polyurethane foam contained as the main component (50% by mass or more of the whole) in the polyurethane continuous porous body sheet 21 has a skeleton thereof. The surface is hydrophilic. Specific examples of the flexible polyurethane foam having a hydrophilic skeleton surface include a flexible polyurethane foam having a hydrophilic skeleton itself (the former) and a flexible polyurethane foam having a hydrophilic group introduced into the skeleton surface (the latter). Be done. The former can be obtained, for example, by using a compound containing a polyalkylene oxide polyol as a polyol component of the raw material compound. The latter can be obtained by reacting a flexible polyurethane foam with a surfactant, an ethylene oxide compound or the like according to a known method.

Whether or not the skeleton surface of the flexible polyurethane foam is hydrophilic can be determined by the following method. First, the flexible polyurethane foam (width 10 mm or more, length 10 mm or more) is allowed to stand so as not to bend. Then, 10 drops (0.05 mL) of ion-exchanged water are dropped on the flexible polyurethane foam, and the time until it is absorbed by the flexible polyurethane foam is measured. When this time is within 5 seconds, or when 8 or more drops of water are absorbed, it is judged to be hydrophilic.

(Composite non-woven fabric)
The composite nonwoven fabric 22 includes a spunbonded nonwoven fabric and a pulp fiber web laminated and integrated on at least one surface of the spunbonded nonwoven fabric. Here, "integration" means that the spunbonded nonwoven fabric and the pulp fiber web are not partially peeled off and their functions are not significantly reduced by at least the end of use of the absorbent article 50. do. By integrating the spunbonded nonwoven fabric and the pulp fiber web, the strength, softness, texture and the like of the composite nonwoven fabric 22 and thus the highly absorbent sheet 25 can be improved. Further, since the pulp fiber web has irregularities on the surface, the highly absorbent polymer 12 gets stuck in the irregularities in the block-shaped closed space 27, and the position of the highly absorbent polymer 12 shifts and moves. Etc. are less likely to occur. As a result, gel blocking of the highly absorbent polymer 12 does not occur in the block-shaped closed space 27, and deterioration of absorption performance such as absorption rate and absorption amount is suppressed.

In a preferred embodiment, for example, a pulp fiber web that contributes to preventing reversion in the absorber 20 is located inside the highly absorbent sheet 25 and is in contact with the highly absorbent polymer 12, for example, strength to the absorber 20. The composite nonwoven fabric 22 is arranged so that the spunbonded nonwoven fabric that contributes to the application or the like faces the outside. The basis weight of the spunbonded non-woven fabric is, for example, 7 g / m ² or more and 20 g / m ² or less, and the basis weight of the pulp fiber web is, for example, 30 g / m ² or more and 70 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 composite nonwoven fabric to an appropriate range described later.

In another preferred embodiment, the composite nonwoven fabric 22 is a water flow entangled integral of the spunbonded nonwoven fabric and the pulp fiber web. The integrated product is, for example, a composite nonwoven fabric 22 in which pulp fibers are entangled with a water jet on the surface of a spunbonded nonwoven fabric without using a binder, and the pulp fibers web is provided integrally. In such a composite non-woven fabric 22, the fibers constituting the spunbonded nonwoven fabric and the pulp fibers are entangled on one surface of the spunbonded nonwoven fabric to integrate the pulp fiber web, and a part of the pulp fibers is spunbonded nonwoven fabric. Is exposed on the other surface in the thickness direction, and the spunbonded non-woven fabric and the pulp fiber web are extremely firmly bonded. Further, due to the pressurization of the water flow entanglement, the unevenness of the surface of the pulp fiber web becomes more apparent, and the effect of preventing the highly absorbent polymer 12 from shifting or moving is further enhanced.

The above-mentioned water flow entanglement treatment is carried out by injecting water jets from a plurality of water jet nozzles arranged linearly at predetermined intervals. Here, the hole diameter Φ of the water jet nozzle is, for example, 0.06 mm or more and 0.15 mm or less, and the distance between the water jet nozzles is, for example, 0.4 mm or more and 1.0 mm or less.

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 spunbonded non-woven fabric is not particularly limited, but is a group consisting of nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene from the viewpoint of the strength and liquid permeability of the composite type non-woven fabric 22 as a whole. A spunbonded non-woven fabric composed of fibers made of one or two kinds of synthetic resins selected from the above is preferable, a spunbonded non-woven fabric containing polypropylene fibers as synthetic resin fibers is more preferable, and a spunbonded non-woven fabric made of polypropylene fibers is more preferable. Is more preferable.

In the composite nonwoven fabric 22, the weight ratio of the spunbonded nonwoven fabric and the pulp fiber web (spunbond 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 composite nonwoven fabric 22 tends to be poor in texture and absorption of sweat and tends to be stuffy, and when it exceeds 90% by mass, the composite nonwoven fabric 22 tends to be hard. ..

In the tensile test of the composite nonwoven fabric 22 with tencilon, the tensile strength required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction is in the range of 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. Since the composite nonwoven fabric 22 has the tensile strength as described above, the strength of the highly absorbent sheet 25 can be improved and the absorption and retention performance of body fluids can be enhanced.

The basis weight of the composite nonwoven fabric 22 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 composite nonwoven fabric 22 becomes too soft and the manufacturing 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 composite nonwoven fabric 22 increases in hardness and thickness. As a result, the absorber 20 becomes hard and tends to impair the wearing feeling and the fitting feeling.

(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 in the highly absorbent sheet 25 is, for example, in the range of 30 g / m ² or more and 300 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 25. 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 may be encapsulated in a plurality of block-shaped closed spaces 27 without being adhered, but a part or all thereof may be partially or entirely of the polyurethane continuous porous sheet 21 and / or the composite nonwoven fabric 22. It may be adhered to the facing surface with a hot melt adhesive. At this time, 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 impairing the body fluid 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 the hydrophilic sheet 24, any of those commonly used in this field can be used, and examples thereof include tissue paper, absorbent paper, and hydrophilic non-woven fabric. Examples of the hydrophilic non-woven fabric include thermal-bonded non-woven fabric, spun-bonded non-woven fabric, air-laid non-woven fabric, and air-through non-woven fabric. Among these, tissue paper, hydrophilic non-woven fabric and the like are preferable, and hydrophilic non-woven fabric such as thermal bond non-woven fabric, spun-bonded non-woven fabric and air-through non-woven fabric are more preferable from the viewpoint of availability and cost. The basis weight of the hydrophilic sheet 24 is, for example, 7 g / m ² or more and 45 g / m ² or less, or 13 g / m ² or more and 50 g / m ² or less.

(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 20 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 in the range of 15 g / m ² or more and 40 g / m ² or less, for example, from the viewpoint 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 sides in the width direction of the skin side surface of the top sheet 10 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 near the ends. In the three-dimensional gather 40 of the present embodiment, one end in the width direction is fixed in the vicinity of both side ends in the width direction of the skin side surface of the back sheet 30, and the middle portion in the width direction is fixed in the vicinity of both side ends in the width direction of the skin side surface of the top sheet 10. The other end in the width direction is a free end 40a that is not fixed to the top sheet 10. 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 fixed 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 10 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 20 inside, and the vicinity of both ends in the width direction of the skin side surface of the top sheet 10. The absorbent article 50 of the present embodiment also includes an embodiment that does not include the three-dimensional gather 40.

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.

<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 20 between the top sheet 10 and the back sheet 30 and a part or all of the top sheet 10 and the back sheet 30 are included. Manufacturing including a step of fixing with hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over the circumference, and a step of installing a three-dimensional gather 40 at predetermined positions of the back sheet 30 and the top sheet 10. The method can be mentioned. 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.

<Absorbable article (second embodiment)>
FIG. 5 shows the absorbent article 51 according to the second embodiment. The absorbent article 51 has the same configuration and the same modification as the absorbent article 50 except that the absorbent body 26 is provided in place of the absorbent body 20 and the transfer sheet 11 is provided between the top sheet 10 and the absorbent body 26. Have.

(Absorber)
The absorber 26 has the same configuration and the same modification as the absorber 20 except that the hydrophilic sheet 24 wraps not all but a part of the highly absorbent sheet 25. More specifically, the hydrophilic sheet 24 is C-folded from the non-skin side surface of the highly absorbent sheet 25, but both ends in the width direction face each other on the skin side of the high absorbent sheet 25 without overlapping. ing. Therefore, the hydrophilic sheet 24 covers the non-skin side surface of the high-absorbency sheet 25, both end faces in the width direction, and the vicinity of both ends in the width direction of the skin side surface, and the vicinity of the center portion in the width direction of the skin side surface of the high-absorbency sheet 25. Does not cover. Even in such an embodiment, the same effect as that of the first embodiment can be obtained by combining with the transfer sheet 11.

(Transfer sheet)
The transfer sheet 11 is arranged between the top sheet 10 and the absorber 26, and for example, the body fluid that has permeated the top sheet 10 is intensively transferred to the absorber 26. The transfer sheet 11 is not particularly limited as long as it is a liquid-permeable substrate, and is, for example, a non-woven fabric such as an air-through non-woven fabric, a thermal bond non-woven fabric, and a spunbond non-woven fabric, and a non-woven fabric of the same type or different types such as a thermal bond non-woven fabric / spunbond non-woven fabric. Examples thereof include a composite non-woven fabric such as a laminated body, a foamed film made of urethane foam, polyethylene foam and the like, and a composite sheet which is a laminated body 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 11 is, for example, a range of 20 g / m ² or more or a range of 20 g / m ² or more and 60 g / m ² or less.

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)
A polyurethane continuous porous body sheet (soft polyurethane foam, open cell, 80 g / m ² of basis weight per sheet, apparent density 160 kg / m ³ , foaming magnification 6.3, thickness 2 mm) was prepared. A sample having a width of 20 mm and a length of 50 mm was prepared from the porous body sheet, and 10 drops (0.05 mL) of ion-exchanged water were dropped on the surface of the sample while being placed on a flat laboratory table. Since the water droplets were absorbed within 5 seconds, it was confirmed that at least the surface skeleton of the porous body was hydrophilic.

Next, a composite non-woven fabric (thickness 0.5 mm) was prepared. The composite non-woven fabric is a water flow in which a pulp fiber web (a basis weight of 40 g / m ² per pulp fiber web) is integrated on one surface of a polypropylene spunbonded non-woven fabric (basis weight 15 g / m ² ) by water flow confounding. It was an intertwined product. In this composite non-woven fabric, 3,000 water jet nozzles (hole diameter Φ0.1 mm) were linearly arranged at equal intervals of 0.67 mm with respect to the laminate of the spunbonded nonwoven fabric and the pulp fiber web. It was manufactured by injecting a water jet from a water flow entanglement device. Further, in the tensile test of the composite nonwoven fabric with Tencilon, the tensile strength required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction was 3N / 25 mm.

The SAP was placed between the above-mentioned polyurethane continuous porous body sheet and the pulp fiber web of the composite non-woven fabric at the basis weight shown in Table 1 except for the region where the joint is to be formed, and by ultrasonic welding, FIG. 1 A joint portion having a width of 3 mm similar to that of the above was formed, and a highly absorbent sheet having the dimensions shown in Table 1 was produced. The skin side surface, non-skin side surface and both end surfaces in the width direction of this highly absorbent sheet were wrapped with a spunbonded non-woven fabric (hydrophilic sheet, basis weight 15 g / m ² ) in the same manner as in FIG. 2, to prepare an absorbent body.

The absorbent property of Example 1, which is a urine absorbing pad, uses an air-through non-woven fabric (20 g / m ^{2) as a top sheet, a breathable polyethylene film (basis weight 35 g / m 2 )} as a back sheet, and the absorber obtained above. The article was made.

(Comparative Examples 1 to 3)
Absorbent 31 (FIG. 6, Comparative Example 1) produced in the same manner as in Example 1 except that the positions of the polyurethane continuous porous body sheet and the composite non-woven fabric are exchanged, and the polyurethane continuous porous body sheet is replaced with the composite non-woven fabric. The same as in Example 1 except that the absorber 32 (FIG. 7, Comparative Example 2) produced in the same manner as in Example 1 or the composite non-woven fabric is used instead of the polyurethane continuous porous body sheet. Using the prepared absorber 33 (FIG. 8), absorbent articles of Comparative Examples 1 to 3 which are urine absorbing pads were prepared in the same manner as in Example 1.

The absorbent articles obtained in Example 1 and Comparative Examples 1 to 3 were subjected to the next evaluation test. The results are shown in Table 1.
(Total absorption amount)
After immersing each absorbent article of Example 1 and Comparative Examples 1 to 3 in physiological saline for 5 minutes, the product was drained on a wire mesh for 30 seconds, and the weight difference before and after absorption was measured to obtain the total absorption amount.
(Repeat absorption rate)
A jig having a bottom surface of 140 mm × 100 mm, an outer diameter of 40 mm, an inner diameter of 35 mm, and a weight of 1400 g was placed on each of the absorbent articles of Examples 1 and Comparative Examples 1 to 3, and 100 ml of physiological saline was placed under load. Water was injected three times at minute intervals, and the time for absorbing 100 ml of the third water injection was measured and used as the repeated absorption rate.
(Amount of liquid return)
After the third measurement of the repeated absorption rate is completed, leave it for 10 minutes, put a filter paper with a diameter of 55 mm on it, put a weight on it so that it is under a load of 35 gf / cm ² , and after 1 minute, it is absorbed by the filter paper. The amount of water collected was measured and used as the amount of reversion.
(Diffusion length)
After the third measurement of the repeated absorption rate was completed, the maximum length of the portion where the physiological saline was absorbed was measured and used as the diffusion length.

From Table 1, the highly absorbent polymer is sandwiched between the polyurethane continuous porous sheet and the composite non-woven fabric, and the highly absorbent polymer is enclosed in a plurality of block-shaped closed spaces formed by the joints. By arranging the polyurethane continuous porous body sheet and the composite non-woven fabric in predetermined positions, the total absorption amount is large, the repeated absorption rate is high, the liquid return amount is small, and the diffusion length is large (good body liquid diffusivity). ) It can be seen that a thin, highly absorbent sheet can be obtained.

10 Top sheet 11 Transfer sheet 12 Highly absorbent polymer 20, 26, 31, 32, 33 Absorbent 21 Polyurethane continuous porous body sheet 22 Composite non-woven fabric 23 Joint 24 Hydrophilic sheet 25 Highly absorbent sheet 25A Highly absorbent sheet Precursor 27 Closed space 30 Backsheet 40 Three-dimensional gather 50, 51 Absorbent article

Claims (9)

An absorbent article comprising a liquid permeable top sheet, a liquid permeable back sheet, and an absorber disposed between them and containing no fluff pulp.
The absorber comprises a highly absorbent sheet and a hydrophilic sheet that wraps at least a portion of the highly absorbent sheet.
The highly absorbent sheet is
Polyurethane continuous porous body sheet located on the skin side of the wearer,
A composite non-woven fabric of the polyurethane continuous porous body sheet, which is arranged to face the non-skin side of the wearer and has a pulp fiber web laminated and integrated on a spunbonded non-woven fabric.
A joint portion that is interposed between the polyurethane continuous porous body sheet and the composite non-woven fabric and divides the space between them into a plurality of independent block-shaped closed spaces.
An absorbent article comprising a plurality of highly absorbent polymers encapsulated in the block-shaped closed space. The absorbent according to claim 1, wherein the polyurethane continuous porous body sheet has a basis weight of 30 g / m ² or more and 300 g / m ² or less, and an apparent density of 100 kg / m ³ or more and 200 kg / m ³ or less. Goods. The absorbent article according to claim 1 or 2, wherein the polyurethane continuous porous body sheet has a hydrophilic skeleton surface. Claimed that the tensile strength required to stretch a test piece formed in a width of 25 mm by 2 mm in the vertical direction in a tensile test of the composite nonwoven fabric with Tensilon is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. The absorbent article according to any one of 1 to 3. The spunbonded nonwoven fabric comprises any of claims 1 to 4, comprising fibers made of one or two synthetic resins selected from the group consisting of nylon, vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene. The absorbent article according to item 1. The absorbent article according to any one of claims 1 to 5, wherein the composite nonwoven fabric is an integral product of the spunbonded nonwoven fabric and the pulp fiber web by a water flow entanglement treatment. The water flow entanglement treatment is carried out by injecting water jets from a plurality of water jet nozzles arranged linearly at predetermined intervals, and the hole diameter Φ of the water jet nozzles is 0.06 mm or more and 0.15 mm. The absorbent article according to claim 6, wherein the distance between the water jet nozzles is 0.4 mm or more and 1.0 mm or less. The absorbent article according to any one of claims 1 to 7, wherein the composite nonwoven fabric is arranged so that the surface of the pulp fiber web is in contact with the highly absorbent polymer. The absorbent article according to any one of claims 1 to 8, wherein the highly absorbent polymer has a basis weight of 30 g / m ² or more and 300 g / m ² or less in the highly absorbent sheet.

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