Absorbent bodies and absorbent articles

Abstract

To provide an absorbent article including a thin-type absorber having excellent fluid diffusibility. combining a high-level absorption performance, absorption rate and backflow prevention performance, at high level, and also having excellent wearing comfort and fittability.SOLUTION: An absorbent article 50 comprises a top sheet 10, a back sheet 30 and an absorber 20. The absorber 20 includes an absorbent sheet 25 without including absorbent fibers, and the absorbent sheet 25 is formed by superposing from a skin surface side of a wearer in an order of a polyurethane continuous porous body sheet 21, a perforated film 22 and a composite nonwoven fabric 23, The absorbent article further includes a first SAP layer between the polyurethane continuous porous body sheet 21 and the perforated film 22, and a second SAP layer between the perforated film 22 and the composite nonwoven fabric 23; and is formed by joining them so as to form a first block-like space 62 and a second block-like space 63 for including a high-absorbent polymer 12 between the polyurethane continuous porous body sheet 21 and the perforated film 22, and between the perforated film 22 and the composite nonwoven fabric 23, respectively.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an absorbent body and an absorbent article including the absorbent body. [Background technology]

[0002] Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between them, and body fluids such as urine pass through the top sheet and are absorbed and held by the absorbent body. In recent years, there has been a demand for thin absorbent articles that are not noticeable when worn, and that do not feel strange or uncomfortable when worn. When designing a thin absorbent article, consideration is usually given to reducing the thickness of the absorbent body, which occupies a large part of the absorbent article, and many absorbent articles using thin absorbent bodies have been proposed (Patent Documents 1 to 4).

[0003] In Patent Document 1, in an absorbent article in which a second sheet is disposed between a top sheet and an absorbent body, the absorbent body has a compressibility of 0.12 g / cm 3 It has a higher density and the second sheet is 1.5 x 10 3 The document discloses an absorbent article having a capillary force of 1000 nm or more. According to the document, by optimizing the density of the absorbent body and the capillary force of the second sheet, it is possible to achieve a high level of both a thin absorbent body and excellent absorbency, thereby providing a sense of security and comfort when worn.

[0004] Patent Document 2 discloses an absorbent article having a skin-side absorbent layer containing a nonwoven fabric and a superabsorbent polymer, and a non-skin-side absorbent layer containing a hydrophilic porous material and a superabsorbent polymer, the non-skin-side absorbent layer being substantially elongated, with the amount of superabsorbent polymer distributed in the widthwise central portion being smaller than in other portions. Patent Document 2 describes that by using a hydrophilic porous material for the non-skin-side absorbent layer and optimizing the distribution of the superabsorbent polymer, it is possible to achieve a thin thickness and a fast absorption rate while maintaining high liquid diffusion and liquid retention properties.

[0005] Patent Document 3 discloses an absorbent body including a laminate in which a base layer including a polyurethane foam layer as an absorbent gel material, a superabsorbent polymer layer, an adhesive layer, and a cover layer are laminated in this order, the adhesive layer including a hot melt adhesive, and the cover layer including a nonwoven fabric (claims 1, 2, 4, paragraphs 0010 and 0016). As materials constituting the base layer and the cover layer, only nonwoven fabric materials such as spunbond nonwoven fabric, carded nonwoven fabric, and airlaid nonwoven fabric are described (paragraph 0045). Patent Document 3 describes that by incorporating a polyurethane foam layer that is stably attached onto the base layer, the absorbent body has a good fit and is comfortable, and the utilization rate of the absorbent body's absorption capacity can be maintained (paragraphs 0009 and 0043).

[0006] Patent Document 4 discloses a layered absorbent body including a plastic foam layer and / or a latex foam layer and a body fluid absorbent layer including a particulate superabsorbent polymer, in which the superabsorbent polymer is disposed in a predetermined amount and / or at a predetermined position directly on, between, or below the plastic foam layer and / or the latex foam layer, and the quantitative ratio of the foamed plastic layer and / or the foamed latex layer to the superabsorbent polymer is 1:500 to 50:1, preferably 1:50 to 25:1, and most preferably 1:5 to 10:1. Patent Document 4 describes that the use of the above-mentioned layered absorbent body improves the absorption performance for water and aqueous liquids, particularly the absorption performance under load. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-67897 A [Patent Document 2] JP 2009-131349 A [Patent Document 3] JP 2014-140770 A [Patent Document 4] Special Publication No. 09-509909 Summary of the Invention [Problem to be solved by the invention]

[0008] The absorbents described in Patent Documents 1 to 4 are all thin absorbent sheets that do not contain absorbent fibers such as fluff pulp, and although they are effective in making absorbent articles thinner and lighter, they must sacrifice some absorption performance. In particular, they are unable to maintain sufficient absorption performance in light incontinence products and urine pads, which have a small absorbent surface area.

[0009] In addition, in absorbent articles, the speed of absorption (hereinafter also referred to as "absorption rate") and the small amount of backflow are both important indicators of absorption performance, but it is difficult to satisfy both of them at a high level in thin absorbent articles that use conventional absorbent sheets as the absorbent body.

[0010] An object of the present invention is to provide an absorbent article having a thin absorbent body which has excellent bodily fluid diffusibility, high levels of absorption performance, absorption speed and backflow prevention, and which also has excellent wearing comfort and fit. [Means for solving the problem]

[0011] As a result of intensive research into solving the above problems, the present inventors have found that a desired absorbent body and absorbent article can be obtained by forming a thin absorbent body (absorbent sheet) using a polyurethane continuous porous sheet, a perforated film, a composite nonwoven fabric in which a pulp fiber web is laminated and integrated onto a spunbonded nonwoven fabric, and a highly absorbent polymer, and have thus completed the present invention. That is, the present invention relates to the following absorbent article.

[0012] (1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided therebetween, The absorbent sheet is The garment is made of at least a polyurethane continuous porous body sheet, a perforated film, and a composite nonwoven fabric obtained by laminating and integrating a pulp fiber web onto a spunbond nonwoven fabric in this order from the wearer's skin side, and has a highly absorbent polymer enclosed between the sheets; An absorbent article characterized in that the polyurethane continuous porous body sheet and the perforated film, and the perforated film and the composite nonwoven fabric are bonded together so as to form a block-shaped space in which the superabsorbent polymer is enclosed. (2) The open porous polyurethane sheet has a basis weight of 30 g / m 2 More than 300g / m 2 and the apparent density is 100 kg / m or less 3 More than 200kg / m 3 The absorbent article according to (1) above, which is as follows: (3) The absorbent article according to (1) or (2) above, wherein the surface of the skeleton of the polyurethane continuous porous sheet is hydrophilic. (4) The perforated film has through holes penetrating from the skin side to the non-skin side, the aperture diameter of the through holes is 0.3 mm or more and 1.5 mm or less, and the number of the through holes is 50 / cm 2 An absorbent article as defined in any one of (1) to (3) above. (5) The absorbent article according to (4) above, wherein the through holes have different opening diameters on the skin side and the non-skin side, the difference in opening diameter being 0.03 mm or more and 0.15 mm or less. (6) The absorbent article according to (4) or (5) above, wherein the aperture diameter of the through-hole on the skin side is larger than the aperture diameter on the non-skin side. (7) An absorbent article according to any one of (1) to (5) above, wherein the strength required to stretch a 25 mm wide test piece of the composite nonwoven fabric by 2 mm in the longitudinal direction in a Tensilon tensile test is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less. (8) An absorbent article according to any one of (1) to (7) above, wherein the spunbond nonwoven fabric contains one or more types of fibers made of a resin material selected from the group consisting of nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene. (9) The absorbent article according to any one of (1) to (8) above, wherein the composite nonwoven fabric is a hydroentangled integrated product of the spunbond nonwoven fabric and the pulp fiber web, and the hydroentanglement is carried out under the conditions that the hole diameter Φ of the water jet nozzle for spraying the water jet is 0.06 mm or more and 0.15 mm or less, and the interval between the water jet nozzles is 0.4 mm or more and 1.0 mm or less. (10) The absorbent article according to any one of (1) to (9) above, wherein the composite nonwoven fabric has irregularities on the surface of the pulp fiber web that is in contact with the highly absorbent polymer. (11) The basis weight of the superabsorbent polymer enclosed between the sheets is 30 g / m 2 More than 300g / m 2 An absorbent article according to any one of (1) to (10) above, which is as follows: Effect of the Invention

[0013] According to the present invention, there is provided an absorbent article having a thin absorbent body which has excellent bodily fluid diffusibility, high levels of absorption performance, absorption speed and backflow prevention, and which is also excellent in terms of comfort and fit when worn. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view illustrating a schematic configuration of an absorbent article according to an embodiment of the present invention. [Diagram 2] 2 is a schematic cross-sectional view in the width direction taken along the X1-X1 cutting line shown in FIG. 1. [Diagram 3] 2 is a schematic longitudinal cross-sectional view taken along the line Y1-Y1 shown in FIG. 1. [Figure 4] FIG. 2 is a schematic cross-sectional view showing the configuration of an absorbent sheet. [Diagram 5] 2 is a schematic cross-sectional view showing the flow of bodily fluids in the absorbent article shown in FIG. 1. [Figure 6] 1 is a schematic cross-sectional view in the width direction showing the configuration of an absorbent article according to Comparative Example 1. FIG. [Figure 7] 1 is a schematic cross-sectional view in the width direction showing the configuration of absorbent articles according to Comparative Examples 2 and 3. FIG. [Figure 8] 1 is a schematic cross-sectional view in the width direction showing the configuration of absorbent articles according to Comparative Examples 4 and 5. FIG. [Figure 9] 11 is a schematic cross-sectional view in the width direction showing the configuration of an absorbent article according to Comparative Example 6. FIG. [Figure 10] 11 is a schematic cross-sectional view in the width direction showing the configuration of an absorbent article according to Comparative Example 7. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] In this specification, wearing an absorbent article refers to a state in which the absorbent article is worn on the body, regardless of whether bodily fluids have been absorbed or not. In an absorbent article, the length direction is the direction that spans the front and back of the body via the wearer's crotch when the absorbent article is worn on the body, the width direction is the direction perpendicular to the length direction, and the thickness direction is the direction in which each component is stacked. The skin side is the surface that contacts the wearer's skin and faces the skin when the absorbent article is worn, and the non-skin side is the surface that contacts the wearer's clothing or faces the clothing. Body fluids refer to liquids discharged from the body to the outside, such as urine, blood, and water in loose stools.

[0016] <Absorbent articles> Hereinafter, an absorbent article 50 according to this embodiment will be described with reference to the drawings. Figs. 1 to 3 show the absorbent article 50. Fig. 4 shows an absorbent sheet precursor 25a. Fig. 5 shows a typical flow of bodily fluids in an absorbent body 20. Figs. 6 to 10 show absorbent articles 70, 71, 72, 73, 74, 75, and 76 according to comparative examples 1 to 7, respectively. These drawings do not stipulate the shape, dimensions, size relationship, etc. of each component member in the absorbent article 50.

[0017] The absorbent article 50 of the present embodiment can be used as various absorbent articles for infants, adults, and the elderly, and examples thereof include light incontinence products, light incontinence liners, urine absorption pads, pad products such as sanitary napkins, pants-type paper diapers, tape-type paper diapers, and other paper diaper products. Among these, the absorbent article 50 can be particularly suitably used as pad products such as light incontinence products and urine absorption pads, taking advantage of its thinness and the fact that the absorption amount and absorption speed do not decrease even after multiple absorptions. In addition, various paper diapers as outerwear and the absorbent article 50 as innerwear may be combined. The longitudinal dimension (maximum dimension) and width dimension (maximum dimension) of the absorbent article 50 are not particularly limited, and are, for example, in the range of 100 mm to 800 mm and 50 mm to 500 mm, respectively. By adjusting the dimensions of the absorbent article 50 to the above ranges, various types of absorbent articles can be easily obtained.

[0018] The absorbent article 50 shown in Figures 1 and 2 comprises a liquid-permeable top sheet 10 located on the skin side, a liquid-impermeable back sheet 30 positioned opposite the top sheet 10 and located on the non-skin side, an absorbent body 20 disposed between the top sheet 10 and the back sheet 30, and a pair of three-dimensional gathers 40 provided on the skin side of the top sheet 10.

[0019] The absorbent body 20 includes an absorbent sheet 25 that does not contain absorbent fibers such as fluff pulp, and as shown in FIG. 2, a continuous porous polyurethane sheet 21, a perforated film 22, and a composite nonwoven fabric 23 formed by laminating and integrating a pulp fiber web 26 on a spunbond nonwoven fabric 27 are laminated in this order from the skin side to the non-skin side. A first SAP layer having a superabsorbent polymer 12 (FIG. 4) enclosed between the continuous porous polyurethane sheet 21 and the perforated film 22, and a composite nonwoven fabric 23 having a superabsorbent polymer 12 (FIG. 4) enclosed between the perforated film 22 and the composite nonwoven fabric 23 are laminated in this order from the skin side to the non-skin side. The first SAP layer has a first SAP layer in which superabsorbent polymer 12 is enclosed between the first SAP layer and the composite nonwoven fabric 23, and the first SAP layer is provided with first bonding portions 60 which are strip-shaped in a planar view and run vertically and horizontally, dividing the first SAP layer into block-shaped spaces 62 in the planar direction and partially bonding the continuous polyurethane porous body sheet 21 and the porous film 22, and the second SAP layer is provided with second bonding portions 61 which are strip-shaped in a planar view and run vertically and horizontally, dividing the second SAP layer into block-shaped spaces 63 in the planar direction and partially bonding the porous film 22 and the composite nonwoven fabric 23.

[0020] According to this embodiment, by providing an absorbent sheet 25 in which the layers of a polyurethane continuous porous body sheet 21, a perforated film 22, and a composite nonwoven fabric 23, which are arranged in this order from the wearer's skin side, are partially joined to form block-shaped spaces 62, 63 containing superabsorbent polymer 12 between each layer, it is possible to obtain an absorbent body 20 and an absorbent article 50 comprising the absorbent body 20, which have good absorbency and wearing comfort, and which do not reduce the absorption rate especially during repeated absorption, have little backflow, and have excellent diffusion of body fluids. Since the polyurethane continuous porous sheet 21 is highly flexible, the hardness of the superabsorbent polymer 12 is hardly felt before body fluids are absorbed, and the uneven surface of the pulp fiber web 26 formed by the water jet on the water flow entanglement surface of the composite nonwoven fabric 23 contacts the superabsorbent polymer 12, and further, since the superabsorbent polymer 12 is enclosed and arranged in the block-shaped spaces 63, shifting and movement of the superabsorbent polymer 12 is suppressed, and the thickness and feel can be maintained more uniformly in the longitudinal and transverse directions even after body fluids are absorbed, improving the wearing comfort.

[0021] The absorbent article 50 of this embodiment has the top sheet 10, absorbent body 20, and back sheet 30 as basic constituent units, and can be modified as necessary with various known modifications, such as the provision of the above-mentioned three-dimensional gathers 40, and the provision of a liquid-permeable transfer sheet (not shown) or a liquid-permeable second sheet between the top sheet 10 and absorbent body 20. The components of the absorbent article 50 will be described in more detail below in the order of the top sheet 10, absorbent body 20, back sheet 30, and three-dimensional gathers 40.

[0022] <Top sheet> The top sheet 10 is a liquid-permeable sheet-like substrate that allows bodily fluids to pass quickly toward the absorbent 20. The top sheet 10 is preferably a substrate that is soft to the touch and does not irritate the skin so that it may come into contact with the wearer's skin. Examples of the substrate include hydrophilic sheets, composite nonwoven fabrics that are laminates of the same or different hydrophilic sheets, open-ended films such as open-ended polyethylene films, and foamed films such as polyethylene foam and urethane foam. Examples of hydrophilic sheets include air-through nonwoven fabrics, thermal bond nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and the like, which are made using synthetic fibers made of synthetic resins such as polypropylene and polyethylene, regenerated fibers such as rayon, and natural fibers such as cotton. Among these, nonwoven fabrics are preferred, and air-through nonwoven fabrics, thermal bond nonwoven fabrics, spunbond nonwoven fabrics, and the like are more preferred.

[0023] The surface of the top sheet 10 may be embossed or perforated to improve liquid permeability. The top sheet 10 may contain one or more of lotions, antioxidants, anti-inflammatory components, pH adjusters, antibacterial agents, moisturizers, etc. to reduce irritation to the skin. The basis weight of the top sheet 10 is, for example, 18 g / m2 from the viewpoints of strength, processability, and liquid return. 2 More than 400g / m 2 The range is as follows: The shape of the top sheet 10 is not particularly limited, and may be any shape that covers all or a part of the absorbent body 20 necessary for guiding bodily fluids to the absorbent body 20 without leakage.

[0024] <Absorbent> The absorbent body 20 has a longitudinal dimension (maximum length) in the range of, for example, 100 mm to 800 mm, 150 mm to 500 mm, or 270 mm to 500 mm. The widthwise dimension (maximum width) of the absorbent body 20 is, for example, 50 mm to 500 mm, 60 mm to 400 mm, or 70 mm to 105 mm. When the planar shape of the absorbent body 20 is an hourglass shape, the longitudinal dimension is in the range of 180 mm to 800 mm, the widthwise dimensions of the ventral side and back side parts that contact the wearer's abdomen and back, respectively, are both in the range of 60 mm to 400 mm, and the widthwise dimension of the crotch part that contacts the wearer's crotch is in the range of 90 mm to 250 mm. The absorbent body 20 may be embossed all over or in part. Examples of the shape of the absorber 20 in plan view include an hourglass shape, an I-shape, a rectangle, a rounded rectangle with rounded corners, an oval, and the like.

[0025] The absorbent body 20 of this embodiment includes an absorbent sheet 25 that does not contain absorbent fibers such as fluff pulp, and a hydrophilic sheet 24 that wraps the absorbent sheet 25. The absorbent sheet 25 will be described in detail later. For example, the non-skin side of the absorbent sheet 25 is placed near the center of the width direction of the hydrophilic sheet 24, and after bonding them as necessary, both sides of the hydrophilic sheet 24 in the width direction are overlapped with the skin side of the absorbent sheet 25 by folding them in a C-shape, and the overlapped parts are bonded as necessary, thereby wrapping the entire absorbent sheet 25. The hydrophilic sheet 24 may not only wrap the entire absorbent sheet 25 as described above, but also cover the non-skin side, both width direction sides, and the vicinity of both width direction ends of the skin side of the absorbent sheet 25, and wrap the absorbent sheet 25 so that both width direction ends of the hydrophilic sheet 24 face each other and are separated from each other to form a slit-like space extending in the longitudinal direction between the top sheet 10 and the absorbent sheet 25.

[0026] (hydrophilic sheet) The hydrophilic sheet 24 may be any of those commonly used in this field, including, for example, hydrophilic nonwoven fabrics such as thermal bonded nonwoven fabric, spunbonded nonwoven fabric, airlaid nonwoven fabric, air-through nonwoven fabric, pulp-containing nonwoven fabric, tissue paper, absorbent paper, etc. Among hydrophilic nonwoven fabrics, hydrophilic nonwoven fabrics such as thermal bonded nonwoven fabric, spunbonded nonwoven fabric, air-through nonwoven fabric, pulp-containing nonwoven fabric, etc. are more preferred, and air-through nonwoven fabric, pulp-containing nonwoven fabric, spunbonded nonwoven fabric, etc. are even more preferred. The thickness of the hydrophilic sheet 24 is, for example, in the range of 0.10 mm to 0.25 mm, and the basis weight is, for example, 5 g / m 2 More than 40g / m 2 The range is as follows: Each member constituting the absorbent sheet will now be described.

[0027] (Polyurethane continuous porous sheet) The continuous porous polyurethane sheet 21 contains an open-cell polyurethane foam (hereinafter also referred to as "flexible polyurethane foam") as a main component, and has excellent bodily fluid diffusibility and flexibility. Here, "containing as a main component" means that the soft polyurethane foam accounts for 50% by mass or more of the total. The continuous porous polyurethane sheet 21 may be, for example, a single-layer sheet containing soft polyurethane foam as a main component, or a single-layer sheet made of soft polyurethane foam.

[0028] The continuous porous polyurethane sheet 21, for example, diffuses bodily fluids that have permeated the top sheet 10 evenly throughout the absorbent 20 (absorbent sheet 25). The continuous porous polyurethane sheet 21 is also flexible, and reduces the rough feeling of the particles of the superabsorbent polymer 12 before absorbing bodily fluids, and after absorbing bodily fluids, reduces the jelly-like pressure sensation caused by the swelling of the superabsorbent polymer 12 and the rough feeling after absorbing bodily fluids and swelling and hardening, thereby greatly improving the wearing comfort of the absorbent article 50.

[0029] Flexible polyurethane foams can be obtained, for example, by mixing raw material compounds such as polyols and polyisocyanates, additives such as foaming agents, foam stabilizers, and catalysts, and heating the resulting mixture to foam. Alternatively, a gaseous foaming agent may be injected while reacting the raw material compounds under heating. By appropriately selecting reaction conditions such as the type of raw material compounds, the type and amount of additives, the heating temperature during foaming, the foaming time, and the pressure during foaming, the properties of the flexible polyurethane foam, such as the foaming ratio, apparent density, tensile strength, tensile elongation at break, elongation stress, average coefficient of friction (MIU), and coefficient of friction variation (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 viewpoints of body fluid diffusibility, flexibility, and the like. Flexible polyurethane foams can also be produced according to an extraction method, a W / O emulsion method, and the like.

[0030] The basis weight and apparent density of the continuous porous polyurethane sheet 21 are determined from the viewpoints of bodily fluid diffusion, flexibility, prevention of return of liquid and leakage of bodily fluids, breathability, stuffiness, etc., and are set to, for example, 30 g / m 2 More than 300g / m 2 The following range or 50g / m 2 More than 250g / m 2 The apparent density is selected from the following ranges, and is 100 kg / m from the viewpoints of the mechanical strength of the absorbent body 20 as a whole, prevention of slipping of the absorbent body 20 after absorbing body fluids, flexibility, etc. 3 More than 200kg / m 3 The following range or 120g / m 2 More than 180g / m 2 It is selected from the following ranges:

[0031] The thickness of the continuous porous polyurethane sheet 21 is, for example, in the range of 1.0 mm to 4.0 mm, or in the range of 1.5 mm to 3.2 mm. The thickness is measured under no load conditions using, for example, a "height gauge" (manufactured by Mitutoyo Corporation).

[0032] The skeleton surface of the soft polyurethane foam contained in the continuous polyurethane porous sheet 21 may be hydrophilic or hydrophobic, but in a preferred embodiment, the skeleton surface is hydrophilic from the viewpoint of wettability with body fluids and the like. Examples of the skeleton having hydrophilic properties include those containing polyol and polyalkylene oxide polyol. The skeleton may also be hydrophilized by introducing a hydrophilic group derived from a surfactant or ethylene oxide into the hydrophobic skeleton. Whether the skeleton surface is hydrophilic or not is determined by first cutting a sample having a width of 10 mm or more and a length of 10 mm or more from the continuous polyurethane porous sheet 21 and placing it on a flat surface without bending, then dropping 10 drops (0.05 mL) of ion-exchanged water onto the sample and measuring the time until it is absorbed by the sample. If this time is within 5 seconds or if 8 or more drops of water are absorbed, it is determined to be hydrophilic.

[0033] (perforated film) 2 to 4, the perforated film 22 exhibits liquid permeability by having a plurality of openings 22a penetrating from one surface to the other surface. The perforated film 22 is provided in the absorbent sheet 25 as an intermediate sheet (hereinafter also referred to as "intermediate material") between the continuous porous polyurethane sheet 21, which is the skin-side sheet (hereinafter also referred to as "skin-side material") located on the skin side, and the composite nonwoven fabric 23, which is the non-skin-side sheet (hereinafter also referred to as "non-skin-side material") located on the non-skin side, and the fixed-support layer of the superabsorbent polymer 12 between the continuous porous polyurethane sheet 21 and the composite nonwoven fabric 23 is divided in the thickness direction into a first SAP layer (skin-side SAP layer) and a second SAP layer (non-skin-side SAP layer), and is arranged so that bodily fluids can pass between the first SAP layer and the second SAP layer.

[0034] 5, body fluid excreted into the absorbent 20 (or absorbent sheet 25) spreads once in the planar direction (particularly in the longitudinal direction) in the first SAP layer due to the resistance of the perforated film 22, and at the same time flows into the second SAP layer through the multiple perforations 22a of the perforated film 22, thereby improving the body fluid diffusion properties of the first and second SAP layers, particularly the body fluid diffusion properties in the longitudinal direction. At the same time, the perforated film 22 prevents, for example, gel blocking, which occurs when the superabsorbent polymer 12 that has absorbed body fluid swells and bonds, from occurring over a wide area, resulting in a decrease in the absorption rate and amount absorbed. As a result, even after multiple body fluid absorptions, there is very little decrease in the absorption rate of body fluid, and body fluid can be absorbed while preventing leakage.

[0035] As described above, the perforated film 22 has a plurality of perforations (through holes) 22a penetrating from the skin side to the non-skin side and opening on both surfaces. The number of perforations 22a in the perforated film 22 is, for example, 50 per cm. 2 The upper limit may be appropriately selected according to the aperture diameter of the apertures 22a so that the effect of creating a flow of body fluid in the surface direction in the first SAP layer and the effect of diffusing body fluid from the first SAP layer to the second SAP layer by the apertures 22a can be obtained at a high level in a well-balanced manner. From the viewpoint of body fluid permeability, the aperture area ratio is in the range of 25% to 50%, or in the range of 30% to 50%. The apertures 22a have, for example, a funnel-shaped three-dimensional shape in which the aperture diameter on one surface is larger than the aperture diameter on the other surface. The apertured film 22 of this embodiment is arranged so that the aperture diameter on the skin side surface is larger than the aperture diameter on the non-skin side surface, or the aperture diameter on the non-skin side surface is larger than the aperture diameter on the skin side surface, and this arrangement improves the body fluid diffusion from the first SAP layer to the second SAP layer, thereby improving the body fluid diffusion of the absorbent sheet 25 as a whole. Of the two configurations described above, from the viewpoint of bodily fluid diffusibility, etc., a configuration in which the pore size on the skin side is larger than the pore size on the non-skin side is preferred.

[0036] In the perforated film 22, the pore size on the skin side and non-skin side is selected from the range of 0.3 mm to 1.5 mm, for example. If the pore size is less than 0.3 mm, the permeability of bodily fluids from the first SAP layer to the second SAP layer tends to decrease. If the pore size is more than 1.5 mm, bodily fluids tend to pass through too easily and do not flow in the plane direction of the first SAP layer, particularly in the longitudinal direction. In a preferred embodiment, the perforated film 22 has a pore size on the skin side that is 0.03 mm to 0.15 mm larger than the pore size on the non-skin side. By setting the difference between the pore size on the skin side and the pore size on the non-skin side within the above-mentioned range, a good balance is achieved between the flow of bodily fluids in the plane direction in the first SAP layer by the perforated film 22 and the diffusion of bodily fluids to the second SAP layer, and the bodily fluid diffusion of the absorbent sheet 25 as a whole is improved.

[0037] The basis weight of the perforated film 22 is, for example, 10 g / m2 in order to prevent the absorbent article 50 from feeling hard and becoming less comfortable to wear. 2 More than 100g / m 2 The perforated film 22 is in the following range: As the perforated film 22, any plastic film having through holes with a three-dimensional shape of a funnel can be used without any particular limitation, and examples thereof include perforated polyethylene film and perforated polypropylene film.

[0038] (Composite nonwoven fabric) The composite nonwoven fabric 23 is a nonwoven fabric in which a pulp fiber web 26 is laminated or laminated and integrated on the surface of a spunbond nonwoven fabric 27 (FIGS. 2 to 4). Here, "integrated" means that the spunbond nonwoven fabric 27 and the pulp fiber web 26 are not even partially peeled off during the use period of the absorbent article 50, and the function of the composite nonwoven fabric 23 is not significantly reduced. In the composite nonwoven fabric 23 of this embodiment, as shown in the absorbent precursor 25a before the formation of the first bonded portion 60 and the second bonded portion 61 in FIG. 3, for example, the perforated film 22, which is an intermediate material, and the pulp fiber web 26 of the composite nonwoven fabric 23, which is a non-skin side material, are arranged so as to face each other. By arranging in this manner, the function of the pulp fiber web 26 described later is fully exhibited, and a desired absorbent 20 is obtained.

[0039] The composite nonwoven fabric 23 can be produced by various methods, for example, the hydroentanglement method, which involves spraying pulp fibers together with a water jet onto a spunbond nonwoven fabric. In the hydroentanglement method, from the viewpoint of the balance between appearance, softness to the touch, and efficiency, the hole diameter Φ of the water jet nozzle that sprays the water jet is, for example, in the range of 0.06 mm to 0.15 mm, and the interval between the water jet nozzles is, for example, in the range of 0.4 mm to 1.0 mm.

[0040] In the composite nonwoven fabric 23, which is an integrated product by hydroentanglement, the fibers constituting the spunbond nonwoven fabric 27 and the pulp fibers are entangled on one surface of the spunbond nonwoven fabric 27 to integrate the pulp fiber web 26, and a part of the pulp fibers penetrates the spunbond nonwoven fabric 27 in the thickness direction and is exposed on the other surface, so that the spunbond nonwoven fabric 27 and the pulp fiber web 26 are firmly fixed together. In the composite nonwoven fabric 23 produced by the hydroentanglement method, fine irregularities (not shown) are formed on the surface of the pulp fiber web 26. Therefore, when the perforated film 22 and the pulp fiber web 26 of the composite nonwoven fabric 23 are arranged so that they face each other, the position of the powdered superabsorbent polymer 12 is fixed by the fine irregularities of the pulp fiber web 26, which has the advantage of preventing the superabsorbent polymer 12 from shifting in position due to the wearer's movements and the associated deterioration in absorption performance and wearing comfort. Furthermore, since the pulp fiber web 26 has the function of temporarily storing body fluids, even if a large amount of body fluid is temporarily discharged, the amount of wet-back can be reduced.

[0041] In a preferred embodiment, the composite nonwoven fabric 23 has a tensile strength required to stretch a 25 mm wide test piece by 2 mm in the longitudinal direction in a Tensilon tensile test (hereinafter also referred to as "Tensilon test tensile strength") in the range of 1.5 N / 25 mm to 5.0 N / 25 mm. This allows the absorbent body 20 to achieve a high level of both shape retention and wearing comfort when the absorbent article 50 is worn.

[0042] In another preferred embodiment, the mass composition ratio of the spunbond nonwoven fabric 27 to the pulp fiber web 26 in the composite nonwoven fabric 23 (spunbond nonwoven fabric 27 / pulp fiber web 26, mass %) is in the range of 35 / 65 to 10 / 90, or in the range of 40 / 60 to 25 / 75. When the mass composition ratio is in the above-mentioned range, not only the shape retention effect of the pulp fiber web 26 due to the spunbond nonwoven fabric 27 is maintained, but also the effect of the pulp fiber web 26 in preventing the positional displacement of the superabsorbent polymer 12 is sufficiently exhibited, and the temporary storage ability of the pulp fiber web 26 is sufficiently exhibited, so that wetback and leakage of body fluids at the initial stage of excretion of body fluids are sufficiently prevented, and the composite nonwoven fabric 23 maintains a predetermined softness, thereby imparting a good wearing comfort and touch to the absorbent article 50.

[0043] Here, the spunbond nonwoven fabric 27 may be one produced by a spunbond method, a meltblowing method, a flash spinning method or the like, without any particular limitation. However, a spunbond nonwoven fabric containing one or more types of resin fibers made of a resin material such as polyamide (Nylon (trademark)), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene is preferred. Furthermore, the spunbond nonwoven fabric 27 may be hydrophilized with a known hydrophilic agent such as a surfactant. The hydrophilization treatment makes it easier for body fluids to pass through the spunbond nonwoven fabric 27 and reach the pulp fiber web 26.

[0044] The basis weight of the spunbond nonwoven fabric 27 is, for example, 7 g / m 2 More than 20g / m 2 The following range or 10g / m 2 More than 17g / m 2 The basis weight of the pulp fiber web 26 is, for example, 30 g / m 2 More than 70g / m 2 The following range or 30g / m 2 More than 50g / m 2 The ranges are as follows: When the basis weights of the spunbond nonwoven fabric 27 and the pulp fiber web 26 are within the above-mentioned ranges, it becomes easy to adjust the basis weight of the composite nonwoven fabric 23 to an appropriate range.

[0045] The pulp fibers contained in the pulp fiber web 26 are not particularly limited, but examples thereof include bleached coniferous kraft pulp (NBKP) such as radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. NBKP can be used alone or in combination of two or more types.

[0046] <Block-shaped space> In this embodiment, a first SAP layer is formed by sealing the superabsorbent polymer 12 between the continuous polyurethane porous sheet 21 and the porous film 22, and a plurality of first block-shaped spaces (closed spaces) 62 are formed in the first SAP layer by first bonding parts 60. A second SAP layer is formed by sealing the superabsorbent polymer 12 between the porous film 22 and the composite nonwoven fabric 23, and a plurality of second block-shaped spaces (closed spaces) 63 are formed in the second SAP layer by second bonding parts 61.

[0047] The first and second SAP layers are each divided into a plurality of block-shaped spaces 62, 63 in the surface direction, and have first and second bonding portions 60 and 61, which are strip-shaped in plan view and partially bond the continuous porous polyurethane sheet 21 and the porous film 22, linearly arranged at a predetermined interval in the vertical and horizontal directions. The first and second SAP layers in this embodiment extend substantially parallel to the outer edge of the absorbent article 50 in the longitudinal and width directions at a predetermined interval from the outer edge to form a rectangular closed space substantially similar to the shape of the outer edge of the absorbent article 50, and a plurality of first and second bonding portions 60 and 61 extend substantially parallel to the outer edge at substantially equal intervals in the width direction within the closed space to be connected to the first and second bonding portions 60 and 61 that form the outer frame of the closed space, thereby forming a plurality of first and second SAP layers arranged in parallel in the longitudinal direction. The first and second bonding portions 60 and 61 may be provided along the outer edge of the absorbent article 50.

[0048] A predetermined amount of superabsorbent polymer 12 is enclosed in each of a plurality of first block-shaped (or rectangular) spaces 62 and second block-shaped (or rectangular) spaces 63, which are respectively separated by the first joints 60 and the second joints 61. The amount of superabsorbent polymer 12 enclosed in each of the first block-shaped spaces 62 and the second block-shaped spaces 63 may be the same or different, but the basis weight of the superabsorbent polymer 12 is, for example, 30 g / m 2 More than 300g / m 2 This allows the superabsorbent polymer 12, which has swollen due to the absorption of body fluids, to bind over a wide area, preventing the occurrence of gel blocking that impedes the diffusion of body fluids, and therefore significantly reduces the decrease in absorption performance, such as absorption speed and absorption amount, even if body fluids are repeatedly absorbed.

[0049] The planar shapes of the first block-shaped spaces 62 and the second block-shaped spaces 63 provided in the first SAP layer and the second SAP layer are substantially rectangular in this embodiment, but are not limited thereto and may be various shapes such as triangles (particularly equilateral triangles), hexagons (particularly regular hexagons), circles, concentric circles, etc. The width dimension of the first bonding portions 60 and the number and arrangement of the first bonding portions 60 in the longitudinal and width directions are appropriately selected depending on the amount of superabsorbent polymer 12 to be enclosed in the block-shaped spaces 61, etc. The first bonding portions 60 and the second bonding portions 61 may be formed, for example, by including a hot melt adhesive, or may be welded regions by heat sealing, ultrasonic sealing, etc.

[0050] In a preferred embodiment, the number of block-shaped spaces 63 formed in the second SAP layer is configured to be greater than the number of block-shaped spaces 62 formed in the first SAP layer. This configuration further improves the diffusion of bodily fluids into the absorbent sheet 25 or the entire absorbent body 20, and makes it possible to prevent gel blocking, while maintaining the initial absorption rate and further increasing the absorption amount.

[0051] (Superabsorbent polymer) The superabsorbent polymer 12 is not particularly limited as long as it can absorb body fluids and prevent backflow, and examples thereof include polyacrylates, polyaspartates, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers, and saponification products thereof. Among these, from the viewpoint of the absorption amount per weight, polyacrylates are preferred, polyacrylate alkali metal salts are more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymer 12 can be used alone or in combination of two or more types.

[0052] The superabsorbent polymer 12 is used in the form of particles, fibers, etc., for example, but is preferably used in the form of particles from the viewpoint of ease of handling, etc. In this case, by avoiding the use of a fine powder of superabsorbent polymer 12 that has poor flowability as a powder and using a superabsorbent polymer 12 having a median particle size, it is possible to improve basic absorption performance and reduce the rough feel caused by the hardening of the absorbent body 20. The median particle size of the superabsorbent polymer 12 is, for example, in the range of 50 μm to 600 μm or in the range of 100 μm to 500 μm.

[0053] To seal the superabsorbent polymer 12 in the first block-shaped space 62 and the second block-shaped space 63, for example, a hot melt adhesive is used. As the hot melt adhesive, any hot melt adhesive having a melting point of 100° C. or more and 180° C. or less can be used without any particular limitation, and examples thereof include synthetic rubber hot melt adhesives such as styrene-butadiene-styrene copolymers and styrene-isoprene-styrene copolymers, and olefin hot melt adhesives such as ethylene-vinyl acetate copolymers. As a method for applying the hot melt adhesive, known methods can be used, such as a curtain coat method or a spiral method in which a molten hot melt adhesive is applied from a nozzle in a non-contact manner, or a slot method in which a hot melt adhesive is applied in a contact manner. The content of the hot melt adhesive is, for example, 10 g / m from the viewpoint of not impairing the absorbency of the superabsorbent polymer 12 and the feel on the skin when worn. 2 The range is as follows:

[0054] <Method of manufacturing absorbent sheet and absorbent body> The absorbent sheet 25 of this embodiment can be produced by a manufacturing method including, for example, the steps of spraying superabsorbent polymer 12 in a predetermined pattern on each of the non-skin sides of the polyurethane continuous porous sheet 21 and the perforated film 22, leaving areas where the first joint 60 and the second joint 61 are to be formed; if necessary, supplying a hot melt adhesive to bond and support the superabsorbent polymer 12; overlapping the skin side of the perforated film 22 on the non-skin side of the polyurethane continuous porous sheet 21 on which the superabsorbent polymer 12 has been sprayed or bonded, and overlapping the pulp fiber web 26 of the composite nonwoven fabric 23 on the non-skin side of the perforated film 22 on which the superabsorbent polymer 12 has been sprayed or bonded, to obtain a laminate; and, if necessary, forming the first joint 60 and the second joint 61 while pressurizing and / or heating the laminate. The first bonded portion 60 and the second bonded portion 61 can be formed, for example, using a hot melt adhesive or by a welding method such as heat sealing or ultrasonic sealing. The obtained absorbent sheet 25 is wrapped in the hydrophilic sheet 24 as described above to obtain the absorbent body 20. The hot melt adhesive used here and the method of applying it are the same as those for the hot melt adhesive that fixes and supports the superabsorbent polymer 12.

[0055] <Back sheet> The back sheet 30 may be formed using a breathable or non-breathable substrate that is impermeable to liquids so that the body fluids held by the absorber 20 do not wet clothing. Examples of the substrate include a resin film and a composite sheet that is a laminate of a resin film and a nonwoven fabric. The nonwoven fabric used in the composite sheet is not particularly limited in its manufacturing method, and examples thereof include single-layer nonwoven fabrics such as spunbond nonwoven fabrics and meltblown nonwoven fabrics, composite nonwoven fabrics such as spunbond nonwoven fabrics / meltblown nonwoven fabric laminates, and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and composite films of polyethylene and polypropylene.

[0056] The basis weight of the back sheet 30 is, for example, 15 g / m 2 More than 60g / m 2 The following range or 15g / m 2 More than 40g / m 2 The range is as follows. In order to prevent stuffiness during wearing, it is preferable that the back sheet 30 has breathability. In order to provide the back sheet 30 with breathability, for example, a filler may be blended into the resin film of the base material, or the back sheet 30 may be embossed. An example of the filler is calcium carbonate, and the blending method may be a known method without any restrictions.

[0057] <3D gathers> The three-dimensional gathers 40 are fixed to the skin side of the top sheet 10 near both ends in the width direction of the absorbent article 50 along the longitudinal direction of the absorbent article 50 in order to prevent, for example, lateral leakage of bodily fluids excreted by the wearer of the absorbent article 50. The three-dimensional gathers 40 include an elastic stretch member 40a and a water-repellent and / or waterproof sheet member 40b.

[0058] The elastically stretchable member 40a is disposed in the vicinity of the free end (other end) of the sheet member 40b along the longitudinal direction, imparting uprightness to the free end, and enabling the free end of the sheet member 40b and its neighboring area to be deformed to fit the wearer's body shape. In this embodiment, the sheet member 40b has one widthwise end (fixed end) fixed to the vicinity of both widthwise ends of the skin side of the back sheet 30, a widthwise intermediate portion fixed to the vicinity of both widthwise ends of the skin side of the top sheet 10, and the other widthwise end being a free end having uprightness. The fixing position of the fixed end (one widthwise end) of the sheet member 40b is not limited to this embodiment, and examples thereof include the non-skin side of the back sheet 30, the vicinity of both widthwise ends of the skin side or non-skin side of the joint of all or part of each edge of the top sheet 10 and the back sheet 30 containing the absorbent body 20 therein, and the vicinity of both widthwise ends of the skin side of the top sheet 10.

[0059] The sheet member 40b is a water-repellent and / or waterproof sheet, and is made of, for example, a nonwoven fabric. As the nonwoven fabric for the first sheet member, any water-repellent and / or waterproof (liquid-impermeable) nonwoven fabric made of hydrophobic fibers can be used without any particular limitation, and examples thereof include spunbond nonwoven fabric, meltblown nonwoven fabric, and composite nonwoven fabric (SMS nonwoven fabric) which is a spunbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric laminate. The basis weight of the sheet member 40b is, for example, 13 g / m 2 More than 20g / m 2 The range is as follows: As the elastic stretchable member 40a, for example, thread-, string- or band-shaped members made of natural rubber, synthetic rubber, polyurethane or the like can be appropriately used.

[0060] <Method of manufacturing absorbent articles> The absorbent article 50 can be manufactured by a known manufacturing method, for example, a manufacturing method including a step of arranging the absorbent body 20 between the top sheet 10 and the back sheet 30, a step of fixing the top sheet 10 and the back sheet 30 partially or entirely around the periphery using a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, or the like, and a step of providing three-dimensional gathers 40 at predetermined positions on the back sheet 30 and the top sheet 10. When the absorbent article 50 is a urine absorption pad or a light incontinence pad, it may be individually wrapped in a package and then folded in thirds in the longitudinal direction. Leg gathers, waist gathers, side flaps, and the like may be provided as necessary.

[0061] 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 embodiments and examples. It is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. In addition, it is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0062] The present embodiment will be described more specifically below with reference to examples and comparative examples.

[0063] (Examples 1 to 2 and Comparative Examples 1 to 7) (Production of absorbent articles) Absorbent articles having the configurations shown in Figure 2 (Examples 1 and 2), Figure 6 (absorbent article 70 related to Comparative Example 1), Figure 7 (absorbent article 71 related to Comparative Example 2 and absorbent article 72 related to Comparative Example 3, in which reference number 28 indicates an air-through nonwoven fabric), Figure 8 (absorbent article 73 related to Comparative Example 4 and absorbent article 74 related to Comparative Example 5, reference number 28 indicates an air-through nonwoven fabric), Figure 9 (absorbent article 75 related to Comparative Example 6), and Figure 10 (absorbent article 76 related to Comparative Example 7) were produced as follows.

[0064] The material placed on the skin side is an open-cell polyurethane foam sheet (with a hydrophilic skeleton surface and a basis weight of 80 g / m 2 , thickness 2.0mm, apparent density 140kg / m 3 ), and as an intermediate material, a perforated film (Examples 1 and 2, Comparative Examples 4 and 5), a composite nonwoven fabric (Comparative Example 1), the above-mentioned open-cell polyurethane foam sheet (Comparative Example 2) or an air-through nonwoven fabric (Comparative Example 3) was used, or no intermediate material was used (Comparative Examples 6 and 7), and as a non-skin-side material, a composite nonwoven fabric (Examples 1 and 2, Comparative Examples 1 to 3 and 6), the above-mentioned open-cell polyurethane foam sheet (Comparative Examples 4 and 7) or an air-through nonwoven fabric (Comparative Example 5) was used to prepare absorbent sheets. The obtained absorbent sheets were then transferred onto a spunbond nonwoven fabric (hydrophilic sheet, basis weight 12 g / m 2 An absorbent material measuring 420 mm x 150 mm was used, which was folded in a C-fold and wrapped in a paper wrapper.

[0065] In addition, an air-through nonwoven fabric (basis weight 20 g / m) was used as a liquid-permeable top sheet. 2 ) as a liquid-impermeable back sheet, and a breathable polyethylene sheet (basis weight 35 g / m 2 ) is a composite nonwoven fabric (basis weight 15g / m2) in which spunbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric are laminated in this order as a three-dimensional gather. 2When the top sheet, back sheet and absorbent body were integrated, the top sheet and the skin side of the absorbent body were joined using a hot melt adhesive to produce absorbent articles of Examples 1 and 2 and Comparative Examples 1 to 7, each having a longitudinal dimension of 480 mm and a width dimension of 200 mm.

[0066] The following evaluations were carried out on the absorbent articles of Examples 1 and 2 and Comparative Examples 1 to 7. The results are shown in Table 1. (Total Absorption) After immersion in physiological saline for 5 minutes, the sample is drained on a wire mesh for 30 seconds, and the weight difference before and after absorption is measured. (Repeated absorption rate) Using a jig with a base of 140 x 100 mm, an outer diameter of 40 mm, an inner diameter of 35 mm, and a weight of 1,400 g, 120 ml of saline solution is poured under load three times at 10-minute intervals, and the time it takes to absorb the third 120 ml of water is measured. (liquid return) Absorption rate: 35gf / cm after 10 minutes after three measurements 2 Under load conditions, the amount of moisture absorbed back into a 55 mm diameter filter paper in one minute is measured. (diffusion length) After measuring the absorption rate three times, the maximum length of the part that absorbed the saline solution was measured.

[0067] [Table 1]

[0068] From Table 1, it can be seen that by using an absorbent body in which the absorbent sheet of this embodiment is folded into a C shape with a hydrophilic sheet, it is possible to obtain a thin absorbent article in which the body fluid absorption amount and repeated absorption rate are maintained at a high level and which also has excellent prevention of liquid backflow. [Explanation of symbols]

[0069] 10 Top sheet 12 Superabsorbent polymer 20 Absorber 21 Polyurethane continuous porous sheet 22 Perforated film 23 Composite nonwoven fabric 22a Open hole (through hole) 24 Hydrophilic sheet 25 Absorbent Sheet 26 Pulp fiber web 27 Spunbond nonwoven fabric 30 Back Seat 40 Three-dimensional gathers 40a Elastic elastic member 40b Sheet member 50 Absorbent articles 60 1st joint 61 Second joint 62 First Block Space 63 Second Block Space

Claims

1. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body provided therebetween, The absorbent body does not contain absorbent fibers and has an absorbent sheet, The absorbent sheet is the garment is laminated in this order from the wearer's skin side, with at least a polyurethane continuous porous body sheet, a perforated film, and a composite nonwoven fabric obtained by laminating and integrating a pulp fiber web onto a spunbonded nonwoven fabric, and has a highly absorbent polymer enclosed between the polyurethane continuous porous body sheet and the perforated film, and between the perforated film and the composite nonwoven fabric; An absorbent article characterized in that the polyurethane continuous porous body sheet and the perforated film, and the perforated film and the composite nonwoven fabric are bonded together so as to form a block-shaped space in which the superabsorbent polymer is enclosed.

2. The polyurethane continuous porous sheet has a basis weight of 30 g / m ２ More than 300g / m ２ and an apparent density of 100 kg / m ３ More than 200kg / m ３ 2. The absorbent article of claim 1, wherein:

3. 3. The absorbent article according to claim 1, wherein the surface of the skeleton of the polyurethane continuous porous body sheet is hydrophilic.

4. The perforated film has through holes penetrating from the skin side to the non-skin side, the through holes have an opening diameter of 0.3 mm or more and 1.5 mm or less, and the number of the through holes is 50 / cm ２ The absorbent article according to any one of claims 1 to 3.

5. The absorbent article according to claim 4 , wherein the through-holes have different opening diameters on the skin side and the non-skin side, the difference in opening diameter being 0.03 mm or more and 0.15 mm or less.

6. The absorbent article according to claim 4 or 5, wherein the aperture diameter of the through-holes on the skin side is larger than the aperture diameter of the through-holes on the non-skin side.

7. 6. The absorbent article according to claim 1, wherein the strength required to stretch a 25 mm wide test piece of the composite nonwoven fabric by 2 mm in the longitudinal direction in a Tensilon tensile test is 1.5 N / 25 mm or more and 5.0 N / 25 mm or less.

8. The absorbent article according to any one of claims 1 to 7, wherein the spunbond nonwoven fabric contains one or more types of fibers made of a resin material selected from the group consisting of nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene.

9. 9. The absorbent article according to claim 1, wherein the composite nonwoven fabric is an integrated product formed by integrating the spunbond nonwoven fabric and the pulp fiber web by hydroentanglement, and the hydroentanglement is carried out under conditions in which the hole diameter Φ of the water jet nozzle for spraying the water jet is 0.06 mm or more and 0.15 mm or less, and the spacing of the water jet nozzles is 0.4 mm or more and 1.0 mm or less.

10. The absorbent article according to claim 1 , wherein the composite nonwoven fabric has irregularities on a surface of the pulp fiber web that is in contact with the highly absorbent polymer.

11. The basis weight of the superabsorbent polymer enclosed between the polyurethane continuous porous body sheet and the perforated film, and between the perforated film and the composite nonwoven fabric is 30 g / m, respectively. ２ More than 300g / m ２ 11. The absorbent article according to claim 1, wherein:

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