JP2022099539A - Absorbent body and absorbent article - Google Patents

Abstract

To provide an absorbent article that includes a thin absorbent body that is superior in body fluid diffusibility, combines absorption performance, absorption speed and reversion prevention property at a high level, and is also superior in wearing feeling and fitness.SOLUTION: An absorbent article 50 includes a top sheet 10, an absorbent body 20, and a back sheet 30. The absorbent body 20 has a high-absorbent sheet not containing absorbent fibers. The high-absorbent sheet is laminated in the order of first and second continuous porous body sheets, 21 and 22, and composite-type non-woven fabric 23 from a wearer's skin surface side, and is provided with SAP enclosed between respective sheets. The first and second continuous porous body sheets, 21 and 22, each comprise polyurethane open-cell foam. Spaces 29 for enclosing the first SAP and the second SAP are formed between the first and second continuous porous body sheets, 21 and 22, and between the second continuous porous body sheet 22 and the composite-type non-woven fabric 23. The number of the spaces 29 in the second SAP is more than that in the first SAP. The spaces 29 in the first SAP comprises the spaces 29A extending in the longitudinal direction in the width direction central part and not containing the first SAP.SELECTED DRAWING: Figure 1

Description

The present invention relates to an absorber and an absorbent article comprising the absorber.

Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between them, and body fluid such as urine permeates the top sheet and is an absorbent body. Absorbed and retained in. In recent years, there has been a demand for a thin absorbent article in which it is not noticeable to wear the absorbent article, and there is no discomfort when worn, and there is no feeling of wearing the absorbent article. When designing a thin absorbent article, it is usually considered to reduce the thickness of the absorbent body which occupies most of the absorbent article, and many absorbent articles using the thin absorbent body have been proposed (Patent Documents 1 to 1 to). 4).

In Patent Document 1, in an absorbent article in which a second sheet is arranged between a surface sheet and an absorber, the absorber has a density higher than 0.12 g / cm ³ and the second sheet has a density of 1.5 × 10. Absorbent articles having a capillary force of ³ N or more are disclosed. According to 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 it is safe and comfortable to wear. It is stated that it can give a feeling of wearing.

Patent Document 2 has a skin-side absorbent layer containing a non-woven fabric and a highly absorbent polymer, and a non-skin-side absorbent layer containing a hydrophilic porous material and a highly absorbent polymer, and the non-skin-side absorbent layer is substantially. Disclosed are absorbent articles that are vertically elongated and have a smaller distribution amount of the highly absorbent polymer in the central portion in the width direction as compared with other parts. According to Patent Document 2, a hydrophilic porous material is used for the non-skin side absorbent layer, and by optimizing the distribution of the highly absorbent polymer, the thickness is thin while maintaining high liquid diffusivity and liquid retention. , It is stated that the absorption rate can be increased.

Patent Document 3 includes a base material layer including a polyurethane foam layer as an absorbent gel material, a highly absorbent polymer layer, an adhesive layer, and a laminated body in which a cover layer is laminated in this order, and adheres to the substrate layer. An absorber is disclosed in which the agent layer comprises a hot melt adhesive and the cover layer comprises a non-woven fabric (claims 1, 2, 4, paragraph 0010, paragraph 0016). As the material constituting the base material layer and the cover layer, only non-woven fabric materials such as spunbonded non-woven fabric, curd non-woven fabric, and air-laid non-woven fabric are described (paragraph 0045). According to Patent Document 3, it is described that by incorporating a polyurethane foam layer that can be stably attached on a base material layer, the fit is good and comfortable, and the utilization rate of the absorption capacity of the absorber can be maintained. (Paragraph 0009, paragraph 0043).

In Patent Document 4, in a layered absorber containing a plastic foam layer and / or a latex foam layer and a body liquid absorbing layer containing a particulate highly absorbent polymer, the highly absorbent polymer is a plastic foam layer and / Or placed directly on top of the latex foam layer, between them, or underneath, in a predetermined amount and / or in a predetermined position, and a foamed plastic layer and / or a foamed latex layer: a quantity of highly absorbent polymer. Disclosed are layered absorbers having a ratio of 1: 500 to 50: 1, preferably 1:50 to 25: 1, most preferably 1: 5 to 10: 1. According to Patent Document 4, it is described that by adopting the above-mentioned layered absorber, the absorption performance for water and an aqueous liquid, particularly the absorption performance under a load, is enhanced.

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

All of the absorbers described in Patent Documents 1 to 4 belong to a thin absorbent sheet that does not contain absorbent fibers such as fluff pulp, and are effective in reducing the thickness and weight of the absorbent article. However, the absorption performance must be sacrificed to some extent. In particular, light incontinence products and urine absorbing pads with a narrow absorber area cannot maintain sufficient absorption performance.

Further, in an absorbent article, the speed of absorption (hereinafter also referred to as "absorption rate") and the small amount of reversion are both important as indicators of absorption performance, but a conventional absorbent sheet is used as an absorber. In the thin absorbent article, it is difficult to satisfy both at a high level.

An object of the present invention is to provide an absorbent article having a thin absorber which is excellent in body fluid diffusivity, has absorption performance, absorption rate and reversion prevention property at a high level, and is also excellent in wearing feeling and fit. ..

As a result of intensive research to solve the above problems, the present inventor has obtained a polyurethane continuous porous sheet, a composite non-woven fabric in which a pulp fiber web is laminated and integrated on a spunbonded non-woven fabric, and highly absorbent polymer particles. By forming a thin absorbent body (absorbent sheet) using the above, it has been found that a desired absorbent body and absorbent article can be obtained, and the present invention has been completed. That is, 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 provided between them.
The absorber does not contain absorbent fibers and has a highly absorbent sheet.
The highly absorbent sheet is
From the skin surface side of the wearer, at least the first continuous porous sheet, the second continuous porous sheet, and the composite non-woven fabric in which the pulp fiber web is laminated and integrated on the spunbonded nonwoven fabric are laminated in this order. , Has a highly absorbent polymer encapsulated between the sheets,
The first continuous porous sheet and the second continuous porous sheet each contain a polyurethane open cell foam.
Between the first continuous porous sheet and the second continuous porous sheet, and between the second continuous porous sheet and the composite nonwoven fabric, the first highly absorbent polymer and the said It is bonded so as to form a block-shaped space for enclosing the second highly absorbent polymer.
The number of block-shaped spaces of the second highly absorbent polymer is formed to be larger than the number of block-shaped spaces of the first highly absorbent polymer.
The block-shaped space of the first high-absorbent polymer is characterized in that a block-shaped space containing no first high-absorbent polymer is formed along the longitudinal direction in the central portion in the width direction. Goods.
(2) The continuous porous 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.
(3) The absorbent article according to (1) or (2) above, wherein the continuous porous sheet has a hydrophilic skeleton surface.
(4) The strength required to stretch the 25 mm width test piece of the composite nonwoven fabric by 2 mm in the longitudinal direction in the Tensilon tensile test is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. An absorbent article according to any one of 3).
(5) The spunbonded nonwoven fabric contains one or more fibers made of a resin material selected from the group consisting of nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene. The absorbent article according to any one of (1) to (4).
(6) The composite non-woven fabric is a water flow entanglement integrated product of the spunbonded non-woven fabric and the pulp fiber web, and the water flow entanglement has a hole diameter Φ of a water jet nozzle for injecting a water jet of 0.06 mm or more. The absorbent article according to any one of (1) to (5) above, which is carried out under the conditions of 15 mm or less and the interval between the water jet nozzles is 0.4 mm or more and 1.0 mm or less.
(7) The absorbent article according to any one of (1) to (6) above, wherein the composite nonwoven fabric has irregularities on the surface of the pulp fiber web in contact with the second highly absorbent polymer.
(8) The absorbent article according to any one of (1) to (7) above, wherein the highly absorbent polymer includes a highly absorbent type and a highly absorbent type.
(9) The absorbent article of the above (8), wherein the absorption ratio of the high absorption type is 1.2 times or more of the absorption ratio of the high liquid passage type.
(10) The absorbent article according to (8) or (9) above, wherein the liquid passing speed of the high liquid passing type is 5 times or more the liquid passing speed of the high absorption type.
(11) The above (1) to (10), wherein the basis weight of the high-absorbent polymer in the first high-absorbent polymer and the second high-absorbent polymer is 30 g / m ² or more and 300 g / m ² or less, respectively. Any absorbent article.
(12) The width of the block-shaped space of the first high-absorbent polymer, which does not contain the first high-absorbent polymer along the longitudinal direction in the central portion in the width direction, is 2 mm or more and 20 mm or less. The absorbent article according to any one of 1) to (11).

INDUSTRIAL APPLICABILITY According to the present invention, there is provided an absorbent article having a thin absorber which is excellent in body fluid diffusivity, has absorption performance, absorption rate and reversion prevention property at a high level, and is also excellent in wearing feeling and fit.

It is a top view which shows typically the structure of the absorbent article which concerns on this embodiment. (A) shows the skin side surface, and (b) shows the non-skin side surface. It is a schematic cross-sectional view in the width direction by the X1 _- X1 cutting line shown in FIG. _1A . It is sectional drawing which shows typically the structure of the absorber precursor before forming a joint part. It is a schematic diagram which shows the structure of the main part (absorbent body) of the absorbent article which concerns on Comparative Example 1. (A) is a schematic plan view showing the skin side surface of the absorber, (b) is a schematic plan view showing the non-skin side surface of the absorber, and (c) is the absorber by the X1 _- X1 cutting line shown in ( _a ). It is a schematic cross-sectional view in the width direction of. It is a schematic diagram which shows the structure of the main part (absorbent body) of the absorbent article which concerns on Comparative Example 2. (A) is a schematic plan view showing the skin side surface of the absorber, (b) is a schematic plan view showing the non-skin side surface of the absorber, and (c) is the absorber by the X1 _- X1 cutting line shown in ( _a ). It is a schematic cross-sectional view in the width direction of. It is a schematic diagram which shows the structure of the main part (absorbent body) of the absorbent article which concerns on Comparative Example 3. (A) is a schematic plan view showing the skin side surface of the absorber, (b) is a schematic plan view showing the non-skin side surface of the absorber, and (c) is the absorber by the X1 _- X1 cutting line shown in ( _a ). It is a schematic cross-sectional view in the width direction of. It is a schematic diagram which shows the structure of the main part (absorbent body) of the absorbent article which concerns on Comparative Example 4. FIG. (A) is a schematic plan view showing the skin side surface of the absorber, (b) is a schematic plan view showing the non-skin side surface of the absorber, and (c) is the absorber by the X1 _- X1 cutting line shown in ( _a ). It is a schematic cross-sectional view in the width direction of.

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 length direction is the direction extending to the front and back of the body through the crotch portion of the wearer when the absorbent article is attached to the body, and the width direction is a direction orthogonal to the length 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>
Hereinafter, the absorbent article 50 according to the present embodiment will be described with reference to the drawings. 1 and 2 show the absorbent article 50. FIG. 3 shows the absorber precursor 20A before forming the junction 27 and the junction 28. 4 to 7 show absorbent articles 60, 70, 80, 90 according to Comparative Examples 1 to 4. 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 for babies and adults, for example, light incontinence products, light incontinence liners, urine absorbing pads, pad products such as menstrual napkins, pants-type disposable diapers. , Tape-stop type disposable diapers and other disposable diaper products. Among these, it can be particularly suitably used as a pad product such as a light incontinence product and a urine absorbing pad. Further, various paper diapers as an outer and an absorbent article 50 as an inner may be combined. The lengthwise dimension (maximum dimension) and the widthwise dimension (maximum 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, various forms of the absorbent article can be easily obtained.

The absorbent article 50 shown in FIGS. 1 and 2 has a liquid-permeable top sheet 10 located on the skin side and a liquid-impermeable back sheet 30 arranged opposite to the top sheet 10 and located on the non-skin side. And an absorber 20 arranged between the top sheet 10 and the back sheet 30, and a pair of three-dimensional gathers 40 provided on the skin side surface of the top sheet 10.

The absorber 20 is a highly absorbent sheet that does not contain absorbent fibers such as fluff pulp, and as shown in FIG. 2, the first continuous porous sheet 21 and the second continuous porous sheet 21 are directed from the skin side to the non-skin side. The porous sheet 22 and the composite nonwoven fabric 23 in which the pulp fiber web is laminated and integrated on the spunbonded nonwoven fabric are laminated in this order, and the first continuous porous sheet 21 and the second continuous porous sheet 22 are laminated. It has a first SAP layer 24 in which a highly absorbent polymer is enclosed, and a second SAP layer 25 in which a highly absorbent polymer is enclosed between the second continuous porous sheet 22 and the composite nonwoven fabric 23, and is a first SAP layer. The 24 has a planed visual band-shaped first joining portion 27 that divides the layer into block-shaped spaces in the plane direction and partially joins the first continuous porous sheet 21 and the second continuous porous sheet 22. In the second SAP layer 25, the layer is divided into block-shaped spaces in the plane direction, and the second continuous porous sheet 22 and the composite nonwoven fabric 23 are partially bonded to each other in a plan view band-shaped second bonding portion 28. Is provided. The first continuous porous sheet 21 and the second continuous porous sheet 22 each contain a polyurethane open cell foam.

By adopting the highly absorbent sheet of the present embodiment, the diffusivity of body fluids such as urine is excellent, especially in the longitudinal direction, and the initial absorption rate and absorption amount are maintained even if the body fluids are repeatedly absorbed. It is possible to obtain the absorbent article 50 provided with the absorbent body 20 in which leakage and reversion are remarkably prevented and the wearing feeling and the fit are good. In the present embodiment, in particular, the number of block-shaped spaces 29 for enclosing the highly absorbent polymer is formed more on the non-skin surface side than on the skin surface side, and is formed in the central portion in the width direction on the skin surface side in the longitudinal direction. By forming a block-shaped space 29A that does not contain a highly absorbent polymer, the flow of body fluid is directed from the thickness direction to the longitudinal and lateral directions (longitudinal and widthwise directions), particularly in the longitudinal direction. The amount of absorption can be increased while improving the diffusivity of body fluid. Due to its flexibility, the continuous porous sheets 21 and 22 alleviate the graininess of the highly absorbent polymer itself before draining the body fluid, and alleviate the rugged feeling of the highly absorbent polymer that has swollen by absorbing the body fluid after draining the body fluid. In addition, in the composite type non-woven fabric 23, the uneven surface formed by the water jet formed on the water flow entanglement surface is in contact with the highly absorbent polymer, and the highly absorbent polymer 12 is further arranged in the space 29 formed in a block shape. As a result, the displacement and movement of the highly absorbent polymer are suppressed, and the thickness and tactile sensation can be kept more uniform in the longitudinal direction and the width direction even after the absorption of the body fluid, so that the wearing feeling of the absorbent article 50 is remarkable. improves.

The absorbent article 50 of the present embodiment has the top sheet 10, the absorber 20, and the back sheet 30 as basic constituent units, and if necessary, the arrangement of the three-dimensional gathers 40 as described above and the top sheet are provided. Various known modifications can be made, such as the arrangement of a liquid-permeable transfer sheet (not shown) and a liquid-permeable second sheet between the 10 and the absorber 20. Hereinafter, the constituent members of the absorbent article 50 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.

<Top sheet>
The top sheet 10 is a liquid-permeable sheet-like base material that allows body fluids to quickly pass toward the absorber 20. The top sheet 10 is preferably a base material that has a soft feel and does not irritate the skin so that it may come into contact with the wearer's skin. 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 include spunbonded non-woven fabric. Among these, non-woven fabric is preferable, and thermal-bonded non-woven fabric, spun-bonded non-woven fabric and the like are more preferable.

The surface of the top sheet 10 may be embossed or perforated from the viewpoint of improving liquid permeability. The top sheet 10 may contain one or more of lotions, antioxidants, anti-inflammatory components, pH regulators, antibacterial agents, moisturizers and the like from the viewpoint of reducing irritation to the skin. 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 size (maximum length) of the absorber 20 in the length direction 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 dimension (maximum width) in the width direction 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 70 mm or more and 105 mm or less. When the plan view shape of the absorber 20 is an hourglass shape, the length direction dimension is in the range of 180 mm or more and 800 mm or less, and the width direction dimension of the ventral and dorsal parts that abut on the wearer's abdomen and back, respectively. Both are in the range of 60 mm or more and 400 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 90 mm or more and 250 mm or less. 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.

The absorber 20 of the present embodiment includes a highly absorbent sheet that does not contain absorbent fibers such as fluff pulp, and a hydrophilic sheet 26 that wraps the highly absorbent sheet. The highly absorbent sheet will be described in detail later. For the hydrophilic sheet 26, for example, the non-skin side surface of the highly absorbent sheet is placed near the central portion in the width direction, and after adhering these as necessary, both ends of the hydrophilic sheet 26 in the width direction are folded by C. The high-absorbency sheet is overlapped on the skin side, and if necessary, the overlapped parts are adhered to wrap the entire high-absorbency sheet. The hydrophilic sheet 26 not only wraps the entire high-absorbent sheet as described above, but also covers the non-skin side surface, both side surfaces in the width direction, and the vicinity of both ends in the width direction of the skin side surface of the high-absorbency sheet. A highly absorbent sheet may be wrapped.

(Hydrophilic sheet)
As the hydrophilic sheet 26, any of those commonly used in this field can be used, for example, hydrophilic non-woven fabric such as thermal bond non-woven fabric, spunbond non-woven fabric, air-laid non-woven fabric, air-through non-woven fabric, pulp-containing non-woven fabric, tissue paper, absorbent paper. And so on. Among the hydrophilic non-woven fabrics, hydrophilic non-woven fabrics such as thermal bonded non-woven fabrics, spun-bonded non-woven fabrics, air-through non-woven fabrics and pulp-containing non-woven fabrics are more preferable, and air-through non-woven fabrics, pulp-containing non-woven fabrics and spunbonded non-woven fabrics are further preferable. The thickness of the hydrophilic sheet 26 is, for example, in the range of 0.10 mm or more and 0.25 mm or less, and the basis weight is, for example, in the range of 5 g / m ² or more and 40 g / m ² or less. Hereinafter, each member constituting the highly absorbent sheet will be described.

(Continuous porous sheet)
The first continuous porous sheet 21 and the second continuous porous sheet 22 each contain a polyurethane open cell foam (hereinafter, also referred to as "soft polyurethane foam") as a main component, and are excellent in body fluid diffusivity and flexibility. .. Here, "containing as a main component" means that the flexible polyurethane foam is contained in an amount of 50% by mass or more of the whole. For the first continuous porous sheet 21 and the second continuous porous sheet 22, for example, a single-layer sheet containing a flexible polyurethane foam as a main component, a single-layer sheet made of a flexible polyurethane foam, or the like can be used.

For example, the first continuous porous sheet 21 evenly diffuses the body fluid that has permeated the top sheet 10 throughout the absorber (highly absorbent sheet) 20. The second continuous porous sheet 22 divides the adhesive support layer of the highly absorbent polymer into a first SAP layer 24 and a second SAP layer 25 in the thickness direction, and the body fluid diffusibility of the first SAP layer 24 and the second SAP layer 25. In particular, it enhances the diffusivity of body fluid in the longitudinal direction and prevents gel blocking in which the highly absorbent polymer that has absorbed the body fluid swells and binds to occur in a wide range, and the absorption rate, absorption amount, etc. are lowered. The first continuous porous sheet 21 and the second continuous porous sheet 22 also have flexibility, alleviate the graininess of the particles of the highly absorbent polymer before the absorption of the body fluid, and the highly absorbent polymer swells after the absorption of the body fluid. Since the rugged feeling is alleviated, the wearing feeling of the absorbent article 50 is improved.

The flexible polyurethane foam can be obtained, for example, by mixing a raw material compound such as a polyol or polyisocyanate, an additive such as a foaming agent, a foam stabilizer, or a catalyst, and heating and foaming the obtained mixture. 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, and tensile strength of the flexible polyurethane foam can be determined. Each characteristic such as tensile elongation at break, elongation stress, average friction coefficient (MIU), and friction coefficient fluctuation (MMD) can be adjusted. For example, the foaming ratio of the flexible polyurethane foam is in the range of 10 times or more and 60 times or less from the viewpoint of body fluid diffusivity, flexibility and the like. Further, the flexible polyurethane foam can also be produced according to an extraction method, a W / O emulsion method, or the like.

The basis weight and apparent density of the first continuous porous sheet 21 and the second continuous porous sheet 22 are different from the viewpoints of body fluid diffusivity and flexibility, wetback and body fluid leakage prevention, air permeability and stuffiness, respectively. The basis weight is selected from the range of, for example, 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, and the apparent density is the mechanical strength of the absorber 20 as a whole and body fluid absorption. From the viewpoint of preventing the absorber 20 from slipping off and flexibility, it is selected from a range of 100 kg / m ³ or more and 200 kg / m ³ or less, or 120 g / m ² or more and 180 g / m ² or less. The basis weight and / or apparent density of the first continuous porous sheet 21 and the second continuous porous sheet 22 may be the same or different.

In one embodiment, the basis weight of the first continuous porous sheet 21 is larger than the basis weight of the second continuous porous sheet 22, and the apparent density of the first continuous porous sheet 21 is the second continuous porous sheet 22. Is smaller than the apparent density of. According to this embodiment, the first continuous porous sheet 21 relatively arranged on the skin side has a bulky structure, and the absorption rate during repeated absorption is improved. Further, by arranging the second continuous porous sheet 22 having a relatively low basis weight and a high apparent density and the composite nonwoven fabric 23 from the skin side to the non-skin side, the flow of body fluid can be increased. The flow in the vertical and horizontal directions (longitudinal direction) is larger than the flow in the thickness direction, and the diffusivity of the highly absorbent sheet or the absorbent body 20 as a whole is improved.

The thickness of the first continuous porous sheet 21 and / or the second continuous porous sheet 22 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. The thickness is measured under no-load conditions using, for example, a "height gauge" (manufactured by Mitutoyo Co., Ltd.). The thicknesses of the first continuous porous sheet 21 and the second continuous porous sheet 22 may be the same or different.

The skeleton surface of the flexible polyurethane foam contained in the first continuous porous sheet 21 and / or the second continuous porous sheet 22 may be hydrophilic or hydrophobic, but in a preferred embodiment, the skeleton surface is hydrophilic. Examples of the hydrophilic skeleton include those containing a polyol and a polyalkylene oxide polyol. Further, the hydrophobic skeleton may be hydrophilized by introducing a hydrophilic group derived from a surfactant, ethylene oxide or the like. Whether or not the skeleton surface is hydrophilic is first determined by cutting out from the first continuous porous sheet 21 or the second continuous porous sheet 22 and allowing a sample having a width of 10 mm or more and a length of 10 mm or more to stand without bending. Then, add 10 drops (0.05 mL) of ion-exchanged water to the sample, measure the time until it is absorbed by the sample, and if this time is within 5 seconds, or 8 or more drops are formed. When it is absorbed, it is judged to be hydrophilic.

(Composite non-woven fabric)
The composite nonwoven fabric 23 is a nonwoven fabric in which the pulp fiber web 13 is laminated or laminated on the surface of the spunbonded nonwoven fabric 14 (FIG. 3). Here, "integration" means that the spunbonded nonwoven fabric 14 and the pulp fiber web 13 are partially peeled off during the period of use of the absorbent article 50, and the function of the composite nonwoven fabric 23 is not significantly reduced. It means that there is. The composite nonwoven fabric 23 of the present embodiment is, for example, as shown in the absorber precursor 20A before the formation of the first junction 27 and the second junction 28 in FIG. 3, the second continuous porous sheet 22 and the composite nonwoven fabric. The pulp fiber web 13 of 23 is arranged so as to face each other. By arranging in this way, the function of the pulp fiber web 13 described later is fully exhibited, and the desired absorber 20 can be obtained.

The composite nonwoven fabric 23 can be produced by various methods. For example, according to the water flow confounding method, the composite nonwoven fabric 23 can be produced by injecting pulp fibers into a spunbonded nonwoven fabric together with a water jet. In the water jet entanglement method, the hole diameter Φ of the water jet nozzle that injects the water jet is, for example, 0.06 mm or more and 0.15 mm or less, and the water jet nozzle is in the range from the viewpoint of the balance between the appearance, the softness of the touch, and the efficiency. The interval is, for example, in the range of 0.4 mm or more and 1.0 mm or less.

In the composite nonwoven fabric 23, which is an integrated product due to water flow entanglement, the pulp fiber web 13 is integrated by entwining the fibers constituting the spunbonded nonwoven fabric 14 with the pulp fibers on one surface of the spunbonded nonwoven fabric 14. A part of the pulp fiber penetrates the spunbonded nonwoven fabric 14 in the thickness direction and is exposed on the other surface, and the spunbonded nonwoven fabric 14 and the pulp fiber web 13 are firmly fixed. In the composite nonwoven fabric 23 produced by the water flow confounding method, fine irregularities (not shown) are formed on the surface of the pulp fiber web 13. Therefore, when these are arranged so that the second continuous porous sheet 22 and the pulp fiber web 13 of the composite nonwoven fabric 23 face each other, the position of the powdery highly absorbent polymer is determined by the fine irregularities of the pulp fiber web 13. It is fixed and has the advantage of preventing the position of the highly absorbent polymer from shifting due to the movement of the wearer and the accompanying deterioration of absorption performance and deterioration of the wearing feeling.

In a preferred embodiment, the composite nonwoven fabric 23 has a tensile strength required for stretching a test piece formed in a width of 25 mm by 2 mm in the vertical direction (hereinafter, also referred to as “tensile strength of the Tensilon test”) in a tensile test with Tensilon. , 1.5N / 25mm or more and 5.0N / 25mm or less. As a result, it is possible to achieve both the shape-retaining property of the absorbent body 20 and the wearing feeling when the absorbent article 50 is worn at a high level.

In another preferred embodiment, the mass composition ratio of the spunbonded nonwoven fabric 14 and the pulp fiber web 13 (spunbonded nonwoven fabric 14 / pulp fiber web 13, mass% standard) in the composite nonwoven fabric 23 is 35/65 or more and 10 /. The range is 90 or less, or 40/60 or more and 25/75 or less. When the mass composition ratio is within the above range, the shape-retaining effect of the pulp fiber web 13 by the spunbonded nonwoven fabric 14 is maintained, and not only the effect of preventing the position shift of the highly absorbent polymer by the pulp fiber web 13 but also the effect of the pulp fiber web 13 by the pulp fiber web 13. Temporary retention of body fluid is sufficiently exhibited, wet back and body fluid leakage at the initial stage of body fluid discharge are sufficiently prevented, and the composite non-woven fabric 23 maintains a predetermined softness, which is good for the absorbent article 50. It is possible to give a comfortable wearing feeling and feel.

Here, as the spunbonded nonwoven fabric 14, those produced by a spunbond method, a melt blow method, a flash spinning method, or the like can be used without particular limitation, but polyamide (nylon (trade name), vinylon, polyester, acrylic resin, polyethylene) can be used. A spunbonded nonwoven fabric containing one or more of resin fibers made of a resin material such as polypropylene and polystyrene is preferable. Further, the spunbonded nonwoven fabric 14 is hydrophilized with a known hydrophilic agent such as a surfactant. The hydrophilization treatment makes it easier for the body fluid to pass through the spunbonded nonwoven fabric 14 and reach the pulp fiber web 13.

The basis weight of the spunbonded nonwoven fabric 14 is, for example, 7 g / m ² or more and 20 g / m ² or less, or 10 g / m ² or more and 17 g / m ² or less. The basis weight of the pulp fiber web 13 is, for example, in the range of 30 g / m ² or more and 70 g / m ² or less, or 30 g / m ² or more and 50 g / m ² or less. When the basis weights of the spunbonded nonwoven fabric 14 and the pulp fiber web 13 are set to the above-mentioned ranges, it becomes easy to adjust the basis weight of the composite nonwoven fabric 23 to an appropriate range.

The pulp fiber contained in the pulp fiber web 13 is not particularly limited, and examples thereof include coniferous bleached kraft pulp (NBKP) such as radiata pine, slush pine, southern pine, lodge pole pine, spruce, and Douglas fur. NBKP can be used alone or in combination of two or more.

(Highly absorbent polymer)
In the present embodiment, a highly absorbent polymer is encapsulated between the first continuous porous sheet 21 and the second continuous porous sheet 22 to form the first SAP layer 24, and the second continuous porous sheet 22 and the second continuous porous sheet 22 are formed. A highly absorbent polymer is sealed between the composite nonwoven fabric 23 and the second SAP layer 25 is formed.

The first SAP layer 24 has a planar visual band shape in which the layer is divided into a plurality of block-shaped spaces 29 in the plane direction, and the first continuous porous sheet 21 and the second continuous porous sheet 22 are partially joined. The first joint portion 27 is provided in a straight line with predetermined intervals in the vertical and horizontal directions. The first SAP layer 24 of the present embodiment has a first joint portion 27 provided along the outer periphery of the first SAP layer 24 and each extending linearly in the inside of the first SAP layer 24 substantially parallel to the longitudinal direction and the width direction. It has a plurality of first joints 27. A predetermined amount of the highly absorbent polymer is usually enclosed in a plurality of block-shaped (or rectangular) spaces 29 separated by the first joint portion 27. As a result, the highly absorbent polymer swollen due to the absorption of the body fluid is bound over a wide range, and the occurrence of gel blocking that hinders the diffusion of the body fluid is prevented. Therefore, even if the body fluid is repeatedly absorbed, the absorption rate, absorption amount, etc. The decrease in absorption performance is significantly reduced. The amount of the highly absorbent polymer encapsulated in the plurality of block-shaped spaces 29 provided in the first SAP layer 24 may be the same or different. The plan view shape of the plurality of block-shaped spaces 29 provided in the first SAP layer 24 is substantially rectangular in the present embodiment, but is not limited to this, and is not limited to this, and is a triangle (particularly an equilateral triangle) or a hexagon (particularly a regular hexagon). It can have various shapes such as a circular shape and a concentric circular shape. Further, the width direction dimension, the number and arrangement of the first joint portion 27 in the longitudinal direction and the width direction, and the like are appropriately selected according to the amount of the highly absorbent polymer encapsulated in the block-shaped space 29 and the like. The first joint portion 27 may be configured to contain, for example, a hot melt adhesive, or may be a welded region by heat sealing, ultrasonic sealing, or the like.

In the first SAP layer 24 of the present embodiment, a band-shaped block-shaped space 29A extending in the longitudinal direction is provided in the central portion in the width direction. Unlike other block-shaped spaces 29, this band-shaped block-shaped space 29A does not contain a highly absorbent polymer and functions as a slit, for example, which improves the diffusivity of body fluid in the longitudinal direction. It is an area. The widthwise dimension of the block-shaped space (hereinafter also referred to as “slit space”) 29A is, for example, from the viewpoint of the amount of the highly absorbent polymer encapsulated in the other block-shaped space 29 and the sufficient expression of the slit function. The range is 2 mm or more and 20 mm or less. Further, the longitudinal direction of the slit space 29A is from one end to the other end of the first SAP layer 24 in the present embodiment, but the present invention is not limited to this, and the longitudinal direction of the first SAP layer 24 is one end or the other end from the middle portion in the longitudinal direction. It may be up to, or it may be from one halfway portion in the longitudinal direction of the first SAP layer 24 to the other halfway part.

In the second SAP layer 25, the layer is divided into a plurality of block-shaped spaces 29 in the plane direction, and the second continuous porous sheet 22 and the composite nonwoven fabric 23 are partially bonded to each other in a plan-viewing band-shaped second bonding. The portions 28 are provided in a straight line with predetermined intervals in the vertical and horizontal directions. The second SAP layer 25 of the present embodiment has a second joint portion 28 provided along the outer circumference of the second SAP layer 25 and each extending linearly in the inside of the second SAP layer 25 substantially parallel to the longitudinal direction and the width direction. It has a plurality of second joints 28. A predetermined amount of a highly absorbent polymer is usually enclosed in a plurality of block-shaped (or rectangular) spaces 29 separated by these second joints 28 to prevent gel blocking. The amount of the highly absorbent polymer encapsulated in the plurality of block-shaped spaces 29 provided in the second SAP layer 25 may be the same or different. The plan view shape of the plurality of block-shaped spaces 29 provided in the second SAP layer 25 is substantially rectangular in the present embodiment, but is not limited to this, and is not limited to this, and is a triangle (particularly an equilateral triangle) or a hexagon (particularly a regular hexagon). It can have various shapes such as a circular shape and a concentric circular shape. Further, the width direction dimension, the number and arrangement of the second joint portion 28 in the longitudinal direction and the width direction, and the like are appropriately selected according to the amount of the highly absorbent polymer encapsulated in the block-shaped space 29 and the like. The second joint portion 28 may be configured to contain, for example, a hot melt adhesive, or may be a welded region by heat sealing, ultrasonic sealing, or the like.

In the present embodiment, the number of block-shaped spaces 29 formed in the second SAP layer 25 is larger than the number of block-shaped spaces 29 formed in the first SAP layer 24. According to this configuration, the diffusibility of body fluid to the highly absorbent sheet or the entire absorber 20 is further improved, the absorption rate is maintained at the initial setting, and the absorption amount is further increased while preventing the occurrence of gel blocking. Can be done. The slit-shaped space 29A is not formed in the second SAP layer 25.

The highly absorbent polymer used in the highly absorbent sheet of the present embodiment is not particularly limited as long as it can absorb body fluids and prevent backflow, and is not particularly limited as long as it can absorb body fluids and prevent backflow. -Acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and its saponified product and the like can be mentioned. Among these, polyacrylic acid salt is preferable, polyacrylic acid alkali metal salt is more preferable, and sodium polyacrylate is further preferable, from the viewpoint of the amount of absorption per weight. The highly absorbent polymer can be used alone or in combination of two or more.

The highly absorbent polymer is used, for example, in the form of particles, fibers, etc., but is preferably used in the form of particles from the viewpoint of ease of handling and the like. At this time, by avoiding the use of a highly absorbent polymer of fine powder having poor fluidity as a powder and using a highly absorbent polymer having a medium particle size, the basic performance regarding absorption is enhanced and the absorber 20 is used. It is possible to reduce the rugged tactile sensation generated by the hardening of the polymer. The medium particle size of the highly absorbent polymer is, for example, in the range of 50 μm or more and 600 μm or less, or 100 μm or more and 500 μm or less.

The high-absorbency polymer includes a relatively high-permeable type and a relatively high-absorbency type, depending on the production conditions, raw materials, and the like. The high-confluence type is a type that emphasizes the diffusivity of the body fluid rather than the absorbability of the body fluid, and the high-absorption type is a type that emphasizes the absorbability of the body fluid rather than the diffusivity of the body fluid. Usually, a high-absorption polymer having an absorption rate of 1.2 times or more of the absorption rate of a high-permeable type body fluid is regarded as a high-absorption type, and a high-absorption type having an absorption rate of 5 times or more of the high-absorption type body fluid absorption rate is used. The polymer is a highly liquid-permeable type. In the present embodiment, for example, a high liquid flow type is enclosed in a block-shaped space 29 on both sides of the slit space 29A of the first SAP layer 24 in the width direction, and a high absorption type is further filled in each block-shaped space 29 provided in the second SAP layer 25. Examples thereof include an embodiment in which the above-mentioned material is enclosed.

<Manufacturing method of highly absorbent sheet and absorber>
The highly absorbent sheet of the present embodiment includes, for example, a step of turning over the first continuous porous sheet 21 and the second continuous porous sheet 22 and applying a hot melt adhesive to each non-woven fabric side surface in a predetermined pattern. In addition, a step of spraying a predetermined amount of the highly absorbent polymer on the block-shaped space formation planned area to which the hot melt adhesive is not applied, and if necessary, the highly absorbent polymer is applied to each non-woven fabric side surface with the hot melt adhesive. In the step of fixing, the non-skin side surface of the first continuous porous sheet 21 and the skin side surface of the second continuous porous sheet 22 face each other, and the non-skin side surface of the second continuous porous sheet 22 and the pulp of the composite nonwoven fabric 23 are opposed to each other. It can be produced by a production method including a step of laminating these so as to face the fiber web 13 and a step of pressurizing and / or heating as necessary. The first joint portion 27 and the second joint portion 28 may be formed by a method such as heat sealing or ultrasonic sealing without using a hot melt adhesive. By wrapping the obtained highly absorbent sheet with the hydrophilic sheet 26 as described above, the absorbent body 20 is obtained.

The hot melt adhesive used here may have a melting point of 100 ° C. or higher and 180 ° C. or lower without particular limitation. For example, a styrene-butadiene-styrene-based copolymer, a styrene-isoprene-styrene-based copolymer, or the like can be used. Examples thereof include synthetic rubber-based hot-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. The basis weight 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 feel when worn.

<Back sheet>
The back sheet 30 may be formed by using a breathable or non-breathable 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 used as the base material. For example, a resin film, a composite sheet which is a laminate of a resin film and a non-woven fabric, and the like can be mentioned. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method. Examples thereof include composite non-woven fabrics such as bodies and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

The basis weight of the back sheet 30 is, for example, a range of 15 g / m ² or more and 60 g / m ² or less, or a range of 15 g / m ² or more and 40 g / m ² or less from the viewpoint of strength and workability. Further, in order to prevent stuffiness when worn, it is preferable that the back sheet 30 is provided with breathability. In order to provide the back sheet 30 with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet 30 may be embossed. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Three-dimensional gather>
The three-dimensional gather 40 is, for example, a top sheet along the length direction of the absorbent article 50 near both ends in the width direction of the absorbent article 50 in order to prevent lateral leakage of the body fluid excreted by the wearer of the absorbent article 50. It is fixed to the side of the skin of 10. The three-dimensional gather 40 includes an elastic stretchable member 40a and a water-repellent and / or waterproof sheet member 40b.

The elastic elastic member 40a is arranged along the length direction near the free end (the other end) of the seat member 40b, imparts erectability to the free end, and wears the free end of the seat member 40b and a region in the vicinity thereof. Make it deformable according to the body shape of the person. In the present embodiment, one end (fixed end) in the width direction of the sheet member 40b is fixed near both 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 near both 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 having uprightness. The fixing position of the fixed end (one end in the width direction) of the sheet member 40b is not limited to the present embodiment, and for example, the non-skin side surface of the back sheet 30, the top sheet 10 and the back sheet 30 in which the absorber 20 is housed inside. Examples thereof include the vicinity of both ends in the width direction of the skin side surface or the non-skin side surface of the skin side surface or the non-skin side surface of all or part of each edge of the top sheet, and the vicinity of both ends in the width direction of the skin side surface of the top sheet 10.

The sheet member 40b is a sheet having water repellency and / or waterproofness, and is made of, for example, a non-woven fabric. As the non-woven fabric for the first sheet member, a water-repellent and / or waterproof (liquid impermeable) non-woven fabric formed of hydrophobic fibers can be used without particular limitation, and for example, a spunbond non-woven fabric, a melt blow non-woven fabric, and a spunbond. Examples thereof include a composite non-woven fabric (SMS non-woven fabric) which is a non-woven fabric / melt blow non-woven fabric / spunbond non-woven fabric laminate. The basis weight of the sheet member 40b is, for example, in the range of 13 gsm or more and 20 gsm or less. As the elastic elastic member 40a, for example, a thread-shaped, string-shaped, or strip-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used.

<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 the entire circumference of the top sheet 10 and the back sheet 30. A manufacturing method including a step of fixing using a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc., and a step of installing a three-dimensional gather 40 at predetermined positions of the back sheet 30 and the top sheet 10. 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.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. 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 more detail with reference to Examples and Comparative Examples.

(Example 1 and Comparative Examples 1 to 4)
(Making absorbent articles)
An absorbent article having the configuration shown in FIG. 1 (Example 1), FIG. 4 (Comparative Example 1), FIG. 5 (Comparative Example 2), FIG. 6 (Comparative Example 3) or FIG. 7 (Comparative Example 4) was prepared. .. As the first continuous porous sheet and the second continuous porous sheet, a polyurethane open cell porous sheet (skeletal surface is hydrophilic, basis weight 80 g / m ² , thickness 2.0 mm, apparent density 140 kg / m ³ ) is used. As a composite non-woven fabric, a water flow entanglement integrated product of a polypropylene spunbonded non-woven fabric (basis weight 15 g / m ² ) and a pulp fiber web (basis weight 40 g / m ² ) (water jet nozzle hole diameter 0.10 mm, water jet nose) Using a spacing of 0.7 mm, a tensile strength of 3.0 N / 25 mm in the Tencilon tensile test, a spunbonded non-woven fabric: pulp fiber web = 30:70 (mass ratio)), a highly absorbent sheet having the configuration shown in Table 1 was used. An absorber having a size of 420 mm × 150 mm, which was C-folded and wrapped with a spunbonded non-woven fabric (hydrophilic sheet, basis weight 12 g / m ² ), was used. When the surface of the pulp fiber web of the composite non-woven fabric was observed under a microscope, it was confirmed that the entire surface of the pulp fiber web had irregularities on the order of microns.

In addition, an air-through non-woven fabric (basis weight 20 g / m ² ) is used as a liquid-permeable top sheet, a breathable polyethylene sheet (basis weight 35 g / m ² ) is used as a liquid-impermeable back sheet, and a spunbonded non-woven fabric / is used as a three-dimensional gather. A composite non-woven fabric (basis weight 15 g / m ² ) in which melt-blown non-woven fabric / spunbond non-woven fabric was laminated in this order was used. When integrating the top sheet, back sheet, and absorber, the top sheet and the skin side surface of the absorber are joined using a hot melt adhesive, and the longitudinal dimension of Example 1 and Comparative Examples 1 to 4 is 480 mm. An absorbent article having a width dimension of 200 mm was produced.

The following evaluations were carried out for the absorbent articles of Example 1 and Comparative Examples 1 to 4. The results are shown in Table 1.
(Total absorption amount)
After soaking in physiological saline for 5 minutes, drain the water on a wire mesh for 30 seconds, and measure the weight difference before and after absorption.
(Repeat absorption rate)
Using a jig with a bottom surface of 140 x 100 mm, an outer diameter of 40 mm, an inner diameter of 35 mm, and a weight of 1400 g, 120 ml of physiological saline under load was injected three times at 10-minute intervals, and the time for absorbing 120 ml of the third water injection was measured. do.
(Liquid return)
Absorption rate Three times After the measurement is completed, 10 minutes later, under the condition of 35 gf / cm ² load, the amount of water absorbed back in 1 minute on a filter paper having a diameter of 55 mm is measured.
(Diffusion length)
Absorption rate The maximum length of the part that absorbed the saline solution after 3 measurements.
(Wearing feeling, from wearing to replacement)
A monitor test was conducted by 20 people, and the wearing feeling was evaluated according to the following criteria.
◯: “Good wearing feeling” was 16 or more and 20 or less.
Δ: “Good wearing feeling” was 11 or more and 15 or less.
X: There was no "feeling good to wear", or there were 1 or more and 10 or less.

From Table 1, according to the present embodiment, the total amount of body fluid absorbed is not reduced, the repeated absorption rate is not lowered, the liquid return is small, and the body fluid diffusibility in the longitudinal direction is particularly excellent. It can be seen that an absorbent article having a good wearing feeling can be obtained.

10 Top sheet 13 Pulp fiber web 14 Spun-bonded non-woven fabric 20 Absorber 21 1st continuous porous sheet 22 2nd continuous porous sheet 23 Composite non-woven fabric 24 1st SAP layer 25 2nd SAP layer 26 Hydrophilic sheet 27 1st joint 28 2nd junction 29 Block-shaped space 29A Block-shaped space (slit space)
30 Back sheet 40 Three-dimensional gather 40a Elastic elastic member 40b Seat member 50 Absorbable article

Claims (12)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber provided between them.
The absorber does not contain absorbent fibers and has a highly absorbent sheet.
The highly absorbent sheet is
From the skin surface side of the wearer, at least the first continuous porous sheet, the second continuous porous sheet, and the composite non-woven fabric in which the pulp fiber web is laminated and integrated on the spunbonded nonwoven fabric are laminated in this order. , Has a highly absorbent polymer encapsulated between the sheets,
The first continuous porous sheet and the second continuous porous sheet each contain a polyurethane open cell foam.
Between the first continuous porous sheet and the second continuous porous sheet, and between the second continuous porous sheet and the composite nonwoven fabric, the first highly absorbent polymer and the said It is bonded so as to form a block-shaped space for enclosing the second highly absorbent polymer.
The number of block-shaped spaces of the second highly absorbent polymer is formed to be larger than the number of block-shaped spaces of the first highly absorbent polymer.
The block-shaped space of the first high-absorbent polymer is characterized in that a block-shaped space containing no first high-absorbent polymer is formed along the longitudinal direction in the central portion in the width direction. Goods. The absorbent article according to claim 1, wherein the continuous porous 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. The absorbent article according to claim 1 or 2, wherein the continuous porous sheet has a hydrophilic skeleton surface. Any of claims 1 to 3, wherein the strength required to stretch the 25 mm width test piece of the composite nonwoven fabric by 2 mm in the longitudinal direction in the Tensilon tensile test is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. Or the absorbent article according to item 1. The spunbonded nonwoven fabric comprises one or more fibers made of a resin material selected from the group consisting of nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene. The absorbent article according to any one of claim 4. The composite non-woven fabric is a water flow entanglement integrated product of the spunbonded non-woven fabric and the pulp fiber web, and the water flow entanglement has a hole diameter Φ of a water jet nozzle for injecting a water jet of 0.06 mm or more and 0.15 mm or less. The absorbent article according to any one of claims 1 to 5, which is carried out under the condition that the water jet nozzle spacing is 0.4 mm or more and 1.0 mm or less. The absorbent article according to any one of claims 1 to 6, wherein the composite nonwoven fabric has irregularities on the surface of the pulp fiber web in contact with the second highly absorbent polymer. The absorbent article according to any one of claims 1 to 7, wherein the highly absorbent polymer includes a highly absorbent type and a highly absorbent type. The absorbent article according to claim 8, wherein the absorption ratio of the high absorption type is 1.2 times or more the absorption ratio of the high liquid passage type. The absorbent article according to claim 8 or 9, wherein the liquid passing speed of the high liquid passing type is 5 times or more the liquid passing speed of the high absorption type. One of claims 1 to 10, wherein the basis weight of the high-absorbent polymer in the first high-absorbent polymer and the second high-absorbent polymer is 30 g / m ² or more and 300 g / m ² or less, respectively. Absorbent articles described in the section. Claim 1 to claim 1, wherein the width of the block-shaped space in the first high-absorbent polymer, which does not contain the first high-absorbent polymer along the longitudinal direction in the central portion in the width direction, is 2 mm or more and 20 mm or less. Item 2. The absorbent article according to any one of Item 11.

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