Absorbent articles

Abstract

To provide a relatively thin-type absorbent article having excellent humor diffusibility and humor absorption, preventing humor leak and fluid return, and being comfortable to wear.SOLUTION: An absorbent article 50 comprises a liquid permeable top sheet 10, a liquid impermeable back sheet 30 and an absorber 20 disposed therebetween. The absorber 20 includes a bulky porous layer 21, and a superabsorbent polymer 12 fixed to the inside of the bulky porous layer 21. The bulky porous layer 21 includes a hollow flow path 25 penetrating the inside thereof from a longitudinal one end to the other end. A skin-side surface and a non-skin-side surface in the flow path 25 respectively support superabsorbent polymer 12.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] The absorbent article, for example, comprises a liquid-permeable top sheet located on the wearer's skin side, a liquid-impermeable back sheet located on the wearer's non-skin side, and an absorbent body (hereinafter also referred to as "fluff absorbent body") located between them and containing absorbent fibers such as fluff pulp and highly absorbent polymers as bodily fluid absorbing components, and is configured to absorb and retain bodily fluids such as urine that have permeated the top sheet with the fluff absorbent body. Absorbent articles come in various forms depending on the purpose, such as pad products such as light incontinence pads, light incontinence liners, urine absorption pads, and sanitary napkins, and paper diaper products such as pants-type paper diapers and tape-fastened paper diapers, and are widely used by both adults and infants.

[0003] In conventional absorbent articles, for example, in order to prevent urine leakage in people who urinate a large amount, the content of the bodily fluid absorbing component is increased or the width of the absorbent is widened. However, while such measures provide a sense of security by preventing leakage, there is a first problem in that the wearer's crotch area becomes stiff because of the large amount of bodily fluid absorbing component, and the wearer feels cramped because the width of the absorbent is wider than the wearer's crotch width, resulting in poor wearing comfort. If the amount of bodily fluid absorbing component is not changed and the width of the absorbent is narrowed, the cramped feeling in the crotch area is alleviated, but side leakage becomes more likely to occur.

[0004] On the other hand, underwear-like thin paper diapers that claim to be comfortable to wear and have improved aesthetic appearance are available on the market. In these paper diapers, instead of the conventional fluff absorbent body containing absorbent fibers such as fluff pulp and a superabsorbent polymer, a thin absorbent sheet containing two hydrophilic nonwoven fabrics and a superabsorbent polymer fixed and supported between them is used. However, since the amount of the body fluid absorbing component (superabsorbent polymer) in these paper diapers is small and the absorbent body width is narrow, there is a second problem that the paper diapers are more prone to leakage than pants-type paper diapers with high absorption capacity for people who urinate a lot. Furthermore, if the amount of the body fluid absorbing component is not changed and the absorbent body width is narrowed, the feeling of tightness in the crotch area is alleviated, but there is a third problem that side leakage is likely to occur. Various absorbent articles using thin absorbent sheets have been proposed.

[0005] Patent Document 1 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 such as a sponge 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 1 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. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-131349 A Summary of the Invention [Problem to be solved by the invention]

[0007] The absorbent article described in Patent Document 1 uses a hydrophilic porous material such as a sponge, which is a familiar product that is soft and has excellent liquid absorption speed and liquid retention, but the skin-side absorbent layer is simply a sprinkling of superabsorbent polymer, and therefore does not yet solve the above-mentioned problem 2. In addition, the simple sprinkling of superabsorbent polymer is prone to gel blocking, which hinders the function of the sponge in the lower layer in the later stages of urination.

[0008] An object of the present invention is to provide a relatively thin absorbent article which is excellent in bodily fluid diffusion and absorption properties, prevents bodily fluid leakage and return, and is comfortable to wear. [Means for solving the problem]

[0009] As a result of intensive research into solving the above problems, the present inventors have found that by using soft urethane foam sheets as the skin-side sheet placed on the skin side and the non-skin-side sheet placed on the non-skin side and laminated on the skin-side sheet, forming grooves so as to face the mating surfaces of the skin-side sheet and the non-skin-side sheet, and fixing and supporting a superabsorbent polymer on the skin-side bottom surface of the grooves of the skin-side sheet and the non-skin-side bottom surface of the grooves of the non-skin-side sheet to form an absorbent body, and wrapping the absorbent body as is or with an absorbent sheet having a structure different from that of conventional absorbent sheets, it is possible to obtain an absorbent article that meets the purpose, for example, an absorbent article that has excellent body fluid absorbency and can absorb body fluids multiple times, including an absorbent body that prevents leakage and provides a good wearing feeling even if the crotch portion that mainly contacts the wearer's crotch is made thicker and narrower, and has thus completed the present invention. The present invention provides the following absorbent article.

[0010] (1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed therebetween, The absorbent body includes a bulky porous layer and a highly absorbent polymer fixed to the inside of the bulky porous layer, the bulky porous layer has a hollow flow path penetrating therethrough from one end to the other end in the longitudinal direction, The absorbent article has a highly absorbent polymer supported on each of the skin side and non-skin side in the flow path. (2) Further comprising an absorbent sheet that wraps the outer surface of the bulky porous layer, The absorbent sheet is an absorbent article according to (1) above, comprising a base nonwoven fabric having an inner surface which is a raised surface having a plurality of raised fibers arranged upright and an outer surface which is a non-raised surface, and the superabsorbent polymer fixed between the plurality of raised fibers. (3) The absorbent body is divided into a front portion that mainly contacts the lower abdomen of a wearer of the absorbent article, a crotch portion that is connected to the front portion and mainly contacts the crotch portion of the wearer, and a rear portion that is connected to the crotch portion and mainly contacts the buttocks of the wearer, The absorbent article according to (1) or (2) above, wherein the crotch portion has a portion having a relatively narrow crotch width and portions connected to the front and rear of the portion having a relatively wide crotch width. (4) An absorbent article as described above in (3), wherein the longitudinal dimension of the absorbent body is 400mm or more and 500mm or less, the width dimensions of the front and rear portions are 90mm or more and 110mm or less, respectively, the width dimension of the crotch portion, which is the crotch width, is 50mm or more and 70mm or less, and the longitudinal dimension of the crotch portion is 100mm or more and 150mm or less. (5) The bulky porous material layer has a skin-side bulky porous material layer located on the skin side and a non-skin-side bulky porous material layer located on the non-skin side and overlapped with the skin-side bulky porous material layer, a first groove portion recessed toward the skin side and a second groove portion recessed toward the non-skin side are disposed on a mating surface of the skin-side bulky porous material layer with the non-skin-side bulky porous material layer and on a mating surface of the non-skin-side bulky porous material layer with the skin-side bulky porous material layer, the first groove portion recessed toward the skin side and the second groove portion recessed toward the non-skin side are disposed opposite each other to form the flow path; The absorbent article according to any one of (1) to (4) above, wherein the superabsorbent polymer is fixed to the bottom surface of the first groove portion and the bottom surface of the second groove portion. (6) The absorbent article according to any one of (1) to (5) above, wherein the bulky porous layer contains a hydrophilic soft urethane foam. (7) The absorbent article according to (6) above, wherein the soft urethane foam has pores therein with a pore size of 0.1 mm or more and 3 mm or less, and a porosity of 70 vol. % or more and 95 vol. % or less. (8) The absorbent article according to any one of (1) to (7) above, wherein the flow path has a longitudinal dimension of 100 mm or more and 150 mm or less and a width dimension of 3 mm or more and 13 mm or less. (9) The superabsorbent polymer bonded to the skin side surface and the non-skin side surface of the flow path has a basis weight of 50 g / m 2 More than 400g / m 2 An absorbent article according to any one of (1) to (8) above, which is as follows: (10) The base nonwoven fabric is an air-through nonwoven fabric, and the air-through nonwoven fabric has a basis weight of 20 g / m 2 More than 200g / m 2 The absorbent article according to any one of the above (2) to (9), having a thickness of 0.3 mm or more and 11.0 mm or less, and a fiber thickness constituting the air-through nonwoven fabric of 1.6 dtex or more and 14 dtex or less. Effect of the Invention

[0011] According to the present invention, there is provided a relatively thin absorbent article which is excellent in bodily fluid diffusion and absorbency, prevents bodily fluid leakage and return, and is comfortable to wear. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a pants-type absorbent article according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic development view showing the configuration of the pants-type absorbent article shown in FIG. [Diagram 3] 3 is a schematic cross-sectional view in the width direction taken along the X1-X1 cutting line shown in FIG. 2. [Figure 4] FIG. 2 is a perspective view showing a schematic configuration of an absorbent sheet. [Diagram 5] FIG. 2 is a perspective view showing a schematic external configuration of an absorbent body. [Figure 6] 2 is a side view showing a schematic diagram of deformation of an absorbent body when the pants-type absorbent article shown in FIG. 1 is worn. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In this specification, wearing the absorbent article 50 refers to a state where the absorbent article 50 is attached to the wearer's body, regardless of whether it is before or after absorbing bodily fluids. The longitudinal direction (or vertical direction) of the absorbent article 50 is the direction indicated by Y in the figure, which extends from front to back through the crotch of the wearer when the absorbent article 50 is worn, the width direction (or horizontal direction) is the direction indicated by X in the figure, which is approximately perpendicular to the longitudinal direction, and the thickness direction is the direction indicated by Z in the figure, in which each component is laminated. The skin-side surface (hereinafter also referred to as the "skin-side surface") of the absorbent article 50 and each component thereof is the surface that contacts the wearer's skin or faces the skin, and the non-skin-side surface (hereinafter also referred to as the "non-skin-side surface") is the surface that contacts the wearer's clothing or faces the clothing. Body fluid refers to liquid discharged from the body to the outside, such as urine, blood, and water in loose stool.

[0014] <Absorbent articles> Hereinafter, an absorbent article 50 relating to a pants-type disposable diaper of this embodiment will be described with reference to the drawings. Figs. 1 and 2 show a pants-type absorbent article 50 (hereinafter also simply referred to as "absorbent article 50"). Fig. 3 mainly shows an absorbing part 55. Fig. 4 shows an absorbent sheet 24. Figs. 5 and 6 show the effect of the absorber 20. Each figure does not specify the shape of the absorbent article 50 and each component, or the size relationship, etc. of the absorbent article 50. The absorbent article 50 of this embodiment is a pants-type disposable diaper for adults, but can also be used as various absorbent articles for infants, adults, and the elderly, for example, light incontinence pads, light incontinence liners, urine absorption pads, pad products such as sanitary napkins, disposable diapers for incontinence, tape-fastened disposable diapers, pants-type disposable diapers, and the like.

[0015] The pants-type absorbent article 50 includes an absorbent section 55 having a substantially belt-like shape in the front-rear direction (longitudinal direction) that covers the crotch region of a wearer from the front and rear, and an exterior body 60 that extends around the absorbent section 55 while supporting the absorbent section 55 from the outside and forms the outer shape of the pants-type absorbent article 50. The pants-type absorbent article 50 has a longitudinal dimension in the unfolded state shown in Fig. 2 that is, for example, in the range of 600 mm to 1000 mm, and a width dimension in the range of 450 mm to 900 mm. The pants-type absorbent article 50 having these unfolded dimensions can be made into pants-type absorbent articles 50 for adults in various sizes, such as S size, M size, and L size, after providing elastically stretchable members in predetermined regions as necessary.

[0016] According to this embodiment, for example, the following excellent effects can be obtained. First, since the absorbent body 20 does not contain absorbent fibers such as fluff pulp, the amount of liquid returning is less than that of conventional absorbent articles equipped with absorbent bodies using absorbent fibers, the absorbent body is thinner, and discomfort such as a feeling of pressure caused by the absorption of bodily fluids is greatly reduced. Secondly, when body fluids are discharged, first the bulky porous layer 21 retains the body fluid, and then the superabsorbent polymer 12 absorbs the body fluid in the bulky porous layer 21, returning the bulky porous layer 21 to a relatively dry state. This cycle is repeated, allowing a single absorbent article 50 to smoothly absorb body fluids multiple times without reducing the body fluid absorption rate. Thirdly, by providing a hollow flow path 25 as a bodily fluid flow path inside the bulky porous layer 21 and fixing superabsorbent polymer 12 to the skin side and non-skin side of the flow path 25, the efficiency of absorbing bodily fluids from the bulky porous layer 21 is increased, and even if a large amount of bodily fluid is suddenly excreted (for example, bodily fluids excreted at an average urination rate of 10 mL / sec or more in the elderly), lateral leakage is extremely unlikely to occur. Fourth, even if the superabsorbent polymer 12 fixed in the flow path 25 absorbs body fluids and swells, it does not expand beyond the flow path 25, the hollow area is not blocked, and the part where the superabsorbent polymer 12 is not placed remains as a path for body fluids, so that liquid permeability is maintained even at the end of one body fluid discharge and at the end of the use of one absorbent article 50, and the body fluid absorption rate is kept at a high level. Fifth, since the superabsorbent polymer 12 is present inside the bulky porous layer 21 having cushioning properties, and since the superabsorbent polymer 12 is fixedly supported between a plurality of cushioning brushed fibers 11x in the absorbent sheet 24 even when the absorbent 20 is wrapped in the absorbent sheet 24, the rough feeling of the superabsorbent polymer 12 before the discharge of bodily fluids, the jelly-like pressure feeling immediately after the superabsorbent polymer 12 absorbs bodily fluids and swells, and the rough uneven feeling after the superabsorbent polymer 12 swells and hardens are less likely to be felt, and the material feels good against the skin even after the bodily fluids are discharged, providing excellent wearing comfort. Sixth, because of the excellent bodily fluid absorption performance as described above, even if the crotch width of the crotch part of the absorbent body 20 is narrowed, side leakage of bodily fluids is unlikely to occur, and by further narrowing the crotch width, the feeling of tightness around the crotch of the wearer can be reduced, further improving the wearing comfort in this respect as well. Seventh, by folding the absorbent sheet 24 into a C-shape to wrap the absorbent body 20 and aligning both ends of the absorbent sheet 24 in the width direction between the top sheet 10 and the absorbent body 20 to form a slit-like space 22 extending in the longitudinal direction, the bodily fluid diffusion is further improved, further enhancing the bodily fluid absorption performance, and is also very effective in preventing side leakage even if the crotch width of the crotch part of the absorbent body 20 is narrowed.

[0017] The exterior body 60 and the absorbent section 55 of the pants-type absorbent article 50 of this embodiment have, for example, the following configuration.

[0018] <Exterior body> 1 and 2 is divided into a ventral region 3 that mainly contacts the wearer's abdomen, a dorsal region 5 that mainly contacts the wearer's back, and a crotch region 4 that is interposed between the ventral region 3 and the dorsal region 5 and mainly contacts the wearer's crotch. The crotch region 4 supports part or all of the back sheet 30 side of the absorbent portion 55 on its skin side. In addition, the region where the side seal portion 66 described later is provided (the region where the leg openings 2 are not formed) may be the ventral region 3 or the dorsal region 5, and the region where the side seal portion 66 is not provided (the region where the leg openings 2 are formed) may be the crotch region 4.

[0019] 1 and 2, the exterior body 60 has a ventral region 3 and a dorsal region 5 which are substantially symmetrical with respect to an imaginary center line extending in the width direction at the longitudinal center of the crotch region 4, and the absorbent section 55 is also disposed substantially symmetrically with respect to the imaginary center line. The exterior body 60 is folded in half along the imaginary center line so that the absorbent section 55 is on the inside, and both widthwise side edges of the ventral region 3 and the dorsal region 5 are joined by a pair of side seal sections 66. The side seal sections 66 are formed by joining nonwoven fabric or the like in a predetermined region of the exterior body 60 by a welding method such as heat sealing or ultrasonic welding, thereby forming a stretchable waist opening 1 and a pair of left and right leg openings 2 in the exterior body 60, and configuring the pants-type absorbent article 50 as a whole into a pants-like shape that can be put on and taken off.

[0020] The exterior body 60 is composed of two or more sheets of nonwoven fabric. As shown in Figs. 1 and 2, the exterior body 60 of this embodiment includes an exterior nonwoven fabric sheet 67, an interior nonwoven fabric sheet 68 arranged on the skin side of the exterior nonwoven fabric sheet 67, and an auxiliary nonwoven fabric sheet 69 arranged as necessary. The auxiliary nonwoven fabric sheet 69 covers, for example, the end of the absorbent section 55 to soften the contact of the absorbent section 55 with the skin. At one widthwise edge of the longitudinal end of the ventral region 3, there may be an area in which the exterior nonwoven fabric sheet 67 and the interior nonwoven fabric sheet 68 are laminated in two layers, and an area in which the auxiliary nonwoven fabric sheet 69 is included and the exterior nonwoven fabric sheet 67 and the interior nonwoven fabric sheet 68 are laminated in three layers along the longitudinal direction. Although not shown, such a nonwoven fabric laminate structure is similar at the other widthwise edge of the ventral region 3 and both widthwise edges of the dorsal region 5. The nonwoven fabric laminate structure of the exterior body 60 is not limited to this embodiment, and various conventionally known embodiments can be adopted without particular limitation.

[0021] The exterior nonwoven fabric sheet 67, the interior nonwoven fabric sheet 68, and the auxiliary nonwoven fabric sheet 69 can each be made of a nonwoven fabric such as a thermal bonded nonwoven fabric, an air-through nonwoven fabric, or a spunbonded nonwoven fabric, preferably a spunbonded nonwoven fabric made of a thermoplastic resin such as polypropylene, polyester, or polyethylene. When such a nonwoven fabric is used, its basis weight is, for example, 10 g / m 2 More than 40g / m 2 The range is as follows:

[0022] In a predetermined region of the exterior body 60, one or more elastic stretch members 61, 62, 63, 64, 65, etc. may be arranged as necessary, as shown in Fig. 1 and Fig. 2. For example, a plurality of waist region elastic stretch members 61, 62 are arranged along the width direction in the ventral waist region 3A and the back waist region 5A, a plurality of waist region elastic stretch members 63, 64 are arranged along the width direction in the ventral waist region 3B and the back waist region 5B, and a leg elastic stretch member 65 is arranged along the edge of the leg opening 2. By arranging the elastic stretch members, a plurality of gathers are formed on the surface of the exterior body 60. Any of the known elastic stretch members 61, 62, 63, 64, 65 can be used, and examples of such members include thread-like, string-like, and band-like members made of natural rubber, synthetic rubber, polyurethane, etc., and one type can be used alone or two or more types can be used in combination.

[0023] <Absorption section> As shown in Figures 2 and 3, the absorbent section 55 includes a liquid-permeable top sheet 10, a liquid-impermeable back sheet 30, an absorbent body 20 disposed between the top sheet 10 and the back sheet 30, and a three-dimensional gather 40 provided for the purpose of preventing leakage. The absorbent section 55 of this embodiment has the top sheet 10, the absorbent body 20, and the back sheet 30 as basic structural units, and can be modified as necessary with various known modifications, such as the above-mentioned three-dimensional gather 40, a liquid-permeable transfer sheet (not shown) or a liquid-permeable second sheet (not shown) between the top sheet 10 and the absorbent body 20, etc. The components of the absorbent section 55 will be described in more detail below in the order of the top sheet 10, the absorbent body 20, the back sheet 30, and the three-dimensional gather 40.

[0024] <Top sheet> The top sheet 10 is a liquid-permeable sheet-like substrate that quickly passes bodily fluids toward the absorbent 20 and diffuses the bodily fluids in the surface direction of 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 be directly in 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, each nonwoven fabric is preferable.

[0025] 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, 15 g / m2 from the viewpoints of strength, processability, and liquid return. 2 ) or more 40g / 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, which is necessary for guiding bodily fluids to the absorbent body 20 without leakage.

[0026] <Absorbent> The absorbent 20 is disposed, for example, between the top sheet 10 and the back sheet 30, and absorbs and retains bodily fluids that have passed through the top sheet 10. The absorbent 20 is divided, for example, into a front side portion 55a that mainly contacts the lower abdomen of the wearer, a crotch portion 55b that is connected to one end of the front side portion 55a in the longitudinal direction and mainly contacts the crotch portion of the wearer, and a rear side portion 55c that is connected to an end of the crotch portion 55b opposite to the front side portion 55a in the longitudinal direction and mainly contacts the buttocks of the wearer. In a preferred embodiment, the crotch portion 55a has a portion with a relatively narrow crotch width and a portion with a relatively wide crotch width that is connected to the front and rear of the crotch portion 55a (both sides in the longitudinal direction). According to this embodiment, the feeling of tightness in the crotch portion of the wearer is sufficiently eliminated, the movement of both legs of the wearer becomes smooth, and walking becomes easier, and side leakage is prevented due to the excellent absorption performance described above.

[0027] In the absorbent body 20 classified as described above, the longitudinal dimension is, for example, in the range of 400 mm or more and 500 mm or less, the widthwise dimensions of the front side portion 55a and the rear side portion 55c are, for example, in the range of 90 mm or more and 110 mm or less, respectively, the widthwise dimension of the crotch portion, which is the crotch width, is, for example, in the range of 50 mm or more and 70 mm or less, and the longitudinal dimension of the crotch portion 55b is, for example, in the range of 100 mm or more and 150 mm or less. By setting each dimension of the absorbent body 20 within the above-mentioned range, it is possible to improve the absorption performance such as the absorption speed and the absorption amount while preventing the wearer's crotch portion from becoming cramped and the occurrence of side leakage, and to obtain an absorbent body 20 that can absorb body fluids multiple times (for example, four times or more). The planar shape of the absorbent body 20 is not particularly limited as long as the widthwise dimension of the crotch portion is within the above-mentioned range, and examples thereof include an hourglass shape, an I-shape, a rectangle, a rounded rectangle with four rounded corners, an oval, and the like.

[0028] In this embodiment, the absorbent 20 has a bulky porous layer 21, and the bulky porous layer 21 is wrapped in an absorbent sheet 24, but this is not limited to this embodiment, and the bulky porous layer 21 does not have to be wrapped in an absorbent sheet 24.

[0029] (Bulky porous layer of the first embodiment) The bulky porous layer 21 is composed of a resin foam, which is called a sponge in the field of foams. As the resin foam, any resin foam having a liquid-permeable sponge material with a large number of pores inside and a high porosity, and having hydrophilicity (including those that have been hydrophilized) can be used without any particular limitation. In this embodiment, for example, a resin foam having a pore diameter of 0.1 mm to 3 mm and a porosity of 70 vol% to 95 vol% and having hydrophilicity can be preferably used. One example is soft urethane foam. If the pore diameter is less than 0.1 mm and / or the porosity is less than 70 vol%, the liquid permeability and bodily fluid diffusion of the bulky porous layer 21 tend to decrease, and bodily fluid leakage such as lateral leakage tends to occur easily. If the pore diameter exceeds 3 mm and / or the porosity exceeds 95 vol%, the temporary bodily fluid storage ability of the bulky porous layer 21 tends to decrease, and liquid backflow tends to occur easily. Since the bulky porous layer 21 has many pores therein, a high porosity, and is highly elastic, for example, when a wearer of the absorbent article 50 excretes bodily fluids, the bulky porous layer 21 temporarily retains the bodily fluids before they are absorbed by the superabsorbent polymer 12, significantly reducing the occurrence of fluid backflow and improving the wearing comfort of the absorbent article 50.

[0030] The bulky porous layer 21 has a plurality of hollow flow paths 25 penetrating its interior from one end to the other in the longitudinal direction. The plurality of flow paths 25 are arranged substantially parallel to each other at predetermined intervals (e.g., substantially equal intervals) in the width direction as shown in Fig. 3. The flow paths 25, for example, serve as paths for bodily fluids, improving the bodily fluid diffusibility of the bulky porous layer 21 and maintaining a high level of bodily fluid diffusibility from the beginning to the end of use of the absorbent article 50. The dimensions of the bulky porous layer 21 are the same as those of the absorbent body 20 described above.

[0031] The flow path 25 has a skin side surface and a non-skin side surface inside, and the superabsorbent polymer 12 is fixed to each surface. A hot melt adhesive or the like is used to support the superabsorbent polymer 12 on each surface. There is no particular restriction on the type or shape of the superabsorbent polymer 12 used here, but it is preferable that the liquid permeation rate is 20 mL / min or more at 0.3 psi. The basis weight of the superabsorbent polymer 12 on the skin side surface and the non-skin side surface is, for example, 50 g / m2 More than 400g / m 2 By setting the basis weight within the above-mentioned range, even if the superabsorbent polymer 12 absorbs body fluids and swells, the hollow flow paths 25 are not blocked until the end of the use of the absorbent article 50, and the liquid permeability of the sides of the flow paths 25 is maintained, so that excellent body fluid diffusibility is maintained.

[0032] The longitudinal dimension of the flow channels 25 is provided over the entire longitudinal length of the bulky porous layer 21, and is, for example, in the range of 100 mm to 150 mm, the width dimension is in the range of 3 mm to 13 mm or 3 mm to 10 mm, and the thickness dimension is in the range of 2 mm to 5 mm. If the width dimension is less than 3 mm, bodily fluid diffusibility tends to decrease, and if the width dimension exceeds 13 mm, the width of the flow channels 25 becomes too large, the number of flow channels 25 decreases, the amount of superabsorbent polymer 12 in the bulky porous layer 21 as a whole decreases, and the superabsorbent polymer 12 fixed in the flow channels 25 tends to fall off from the flow channels 25, tending to cause lateral leakage.

[0033] 5 shows the absorbent body 20 (bulky porous layer 21) of this embodiment in which four flow paths 25 are formed over the entire length in the longitudinal direction, but the number of flow paths 25 is not limited to this embodiment and can be any number of 1 or 2 or more, for example, in the range of 2 to 6, or 3 to 5. When flow paths 25, particularly multiple flow paths 25, are formed, the absorbent body 20 becomes more likely to bend in the widthwise inward direction as shown in FIG 6, and discomfort felt when worn in the crotch region of the wearer (the crotch region of the absorbent body 20) is reduced.

[0034] (Bulky porous layer of the second embodiment) As shown in Figure 3, the bulky porous layer 21 of the second embodiment has a skin-side bulky porous layer 21a located on the skin side, and a non-skin-side bulky porous layer 21b located on the non-skin side and overlapped on the skin-side bulky porous layer 21a, and on the overlapping surface of the skin-side bulky porous layer 21a with the non-skin-side bulky porous layer 21b and on the overlapping surface of the non-skin-side bulky porous layer 21b with the skin-side bulky porous layer 21a, a first groove portion recessed toward the skin side and a second groove portion recessed toward the non-skin side are arranged opposite each other to form a flow path 25, and a superabsorbent polymer 12 is fixed to the bottom surface (skin-side surface) of the first groove portion and the bottom surface (non-skin-side surface) of the second groove portion. The bulky porous layer 21 of the second embodiment has the same configuration as the bulky porous layer 21 of the first embodiment, except that the bulky porous layer 21 of the first embodiment is divided into two in the thickness direction. In a preferred embodiment, the skin-side bulky porous layer 21a and the non-skin-side bulky porous layer 21b are bonded with a hot melt adhesive or the like so that the first groove portion and the second groove portion do not shift in position when the wearer of the absorbent article 50 moves their body. Although the adhesive surface has reduced liquid permeability, the first and second groove portions and each side surface are permeable to body fluids, so that the body fluid absorbency of the bulky porous layer 21 of the second embodiment is of a level that does not cause any practical problems.

[0035] (Absorbent sheet) As shown in Figures 3 and 4, the absorbent sheet 24 comprises a base nonwoven fabric 11 having one surface which is a raised surface 11a on which a plurality of raised fibers 11x are arranged upright and the other surface which is a non-raised surface 11b, and a superabsorbent polymer 12 fixed and supported between the plurality of raised fibers 11x on the raised surface 11a of the base nonwoven fabric 11. The superabsorbent polymer 12 is fixed and supported between the raised fibers 11x by, for example, a hot melt adhesive. The superabsorbent polymer 12 may be the same as that fixed in the bulky porous layer 21, without any particular limitation. The basis weight of the superabsorbent polymer 12 in the absorbent sheet 24 is, for example, 200 g / m 2 More than 1200g / m 2 The range is as follows:

[0036] The absorbent sheet 24 of this embodiment wraps the bulky porous layer 21 such that the bodily fluid absorbent layer having the superabsorbent polymer 12 fixedly supported between the raised fibers 11x on the raised surface 11a faces the bulky porous layer 21, and both widthwise ends of the superabsorbent polymer 12 face each other and are spaced apart in the widthwise direction between the bulky porous layer 21 and the top sheet 10, forming slit-like spaces 22. The manner in which the absorbent sheet 24 wraps the bulky porous layer 21 is also called C-folding.

[0037] More specifically, the C-folding of the bulky porous layer 21 using the absorbent sheet 24 is carried out in the following order: a first step of placing the bulky porous layer 21 with the non-skin side facing down near the widthwise center of the raised surface 11a (body fluid absorbent layer) of the absorbent sheet 24, and, if necessary, bonding the surface of the body fluid absorbent layer and the non-skin side of the bulky porous layer 21 with, for example, a hot melt adhesive; a second step of folding back both widthwise sides of the absorbent sheet 24 towards the bulky porous layer 21 to cover both widthwise sides of the bulky porous layer 21; and a third step of folding back both widthwise ends of the absorbent sheet 24 so as to cover both widthwise ends of the skin-side side of the bulky porous layer 21, thereby obtaining a C-folded body of the absorbent body 20 (bulky porous layer 21) having slit-like spaces 22 between the bulky porous layer 21 and the top sheet 10.

[0038] By wrapping the bulky porous layer 21 with the absorbent sheet 24, the bulky porous layer 21 absorbs bodily fluids while the bodily fluid absorbent layer of the absorbent sheet 24 located in the width direction of the bulky porous layer 21 prevents side leakage, making it possible to absorb bodily fluids multiple times, for example, four or more times. In addition, the raised fibers 11x of the absorbent sheet 24 exhibit cushioning properties, improving the fit and wearing comfort of the absorbent article 50 as a whole. Note that this is not limited to the present embodiment, and for example, both ends in the width direction of the absorbent sheet 24 may be configured to overlap between the top sheet 10 and the bulky porous layer 21. The overlapping portions may be bonded with a hot melt adhesive or the like.

[0039] (Slit-shaped space) As shown in Fig. 3, the slit-like space 22 is a spatial region between the top sheet 10 and the bulky porous layer 21 where both ends of the absorbent sheet 24 in the width direction are spaced apart and face each other, and extends in the longitudinal direction. The slit-like space 22 may extend from one end of the absorbent body 20 in the longitudinal direction to the other end of the absorbent body 20, but from the viewpoint of the mechanical strength and bodily fluid retention capacity of the absorbent body 20 as a whole, the longitudinal dimension is, for example, in the range of 100 mm to 150 mm, and the width dimension is in the range of 5 mm to 20 mm, or 7 mm to 15 mm. By setting the longitudinal dimension and the width dimension in the above-mentioned ranges, for example, bodily fluid diffusion can be improved while maintaining the mechanical strength and bodily fluid retention capacity of the absorbent body 20 at a high level. Furthermore, if the width dimension of the slit-like space 22 is less than 5 mm, the effect of improving bodily fluid diffusion tends to be insufficient, and if it exceeds 20 mm, the width dimension of the absorbent sheet 24 becomes shorter, reducing the amount of superabsorbent polymer 12 in the entire absorbent body 20, and the mechanical strength of the absorbent body 20 decreases, tending to lead to leakage. Hereinafter, each material used in the construction of the bulky porous layer 21 and the absorbent sheet 24 will be described.

[0040] (Soft urethane foam) The soft urethane foam, which is one type of resin foam used in the bulky porous layer 21, is a foam of urethane resin, and satisfies the above-mentioned ranges of pore size and porosity, and has excellent body fluid diffusibility and flexibility. The soft urethane foam can be obtained, for example, by mixing raw material compounds such as polyol and polyisocyanate, additives such as a foaming agent, a foam stabilizer, and a catalyst, and heating the resulting mixture to foam. Alternatively, a gaseous foaming agent may be injected while reacting the raw material compounds under heating. The expansion ratio and other properties of the soft urethane foam can be appropriately adjusted by appropriately selecting reaction conditions such as the type of raw material compound, the type and amount of additive, the heating temperature during foaming, the foaming time, and the pressure during foaming.

[0041] The basis weight and apparent density of the soft urethane foam are determined from the viewpoints of bodily fluid diffusion, flexibility, prevention of liquid return and bodily fluid leakage, breathability, stuffiness, etc., and the basis weight is set to, for example, 30 g / m2 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 3 More than 180g / m 3 It is selected from the following ranges:

[0042] The skeleton surface of the flexible urethane foam may be hydrophilic or hydrophobic, but in a preferred embodiment, the skeleton surface is hydrophilic from the viewpoint of wettability with body fluids. Examples of the skeleton having hydrophilicity include those containing polyol and polyalkylene oxide polyol. In addition, the skeleton may 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 with a width of 10 mm or more and a length of 10 mm or more from the flexible urethane foam and placing it on a flat surface without bending, then dropping 10 drops of ion-exchanged water (0.05 mL) on the sample and measuring the time until the sample is absorbed. If this time is within 5 seconds or if 8 or more drops of water are absorbed, it is judged to be hydrophilic.

[0043] (Base nonwoven fabric) A hydrophilic nonwoven fabric is used as the base nonwoven fabric 11 used in the absorbent sheet 24. The thickness of the base nonwoven fabric 11 is not particularly limited, but from the viewpoint of a balance between wearing comfort and absorbency, it is in the range of 0.3 mm to 11.0 mm, 0.5 mm to 5.0 mm, or 0.5 mm to 2.0 mm. The thickness of the fibers constituting the base nonwoven fabric 11 is, for example, in the range of 1.6 dtex to 14 dtex, 1.8 dtex to 9.0 dtex, or 2.0 dtex to 6.0 dtex. The basis weight of the base nonwoven fabric 11 is, for example, 35 g / m 2 More than 120g / m 2The range is as follows: Among such hydrophilic nonwoven fabrics, air-through nonwoven fabrics are preferred.

[0044] The plurality of raised fibers 11x standing on the raised surface 11a are formed by subjecting the surface of the base nonwoven fabric 11 to a raising process such as nap raising. The plurality of raised fibers 11x of the base nonwoven fabric 11 imparts appropriate thickness and softness to the highly absorbent sheet 24 in addition to the bulkiness inherent to the nonwoven fabric, resulting in good cushioning properties and improving the fit and comfort when worn. Furthermore, by raising the base nonwoven fabric 11, the highly absorbent polymer 12 can be dispersed and fixed between the raised fibers 11x. Methods for raising one side surface 11a of the base nonwoven fabric 11 include methods using a rotary saw blade, needle punching, etc., and the method using a rotary saw blade is preferred from the viewpoints of in-line productivity and cost.

[0045] The degree of raising in the base nonwoven fabric 11 is not particularly limited as long as the raising can be visually confirmed. For example, the raising rate as the degree of raising is in the range of 5% to 90% or 8% to 80%. The raising rate means the rate of increase in the thickness of the base nonwoven fabric 11 by the raising process. When the thickness of the base nonwoven fabric 11 before raising is T1 and the thickness of the base nonwoven fabric 11 after raising is T2, the raising rate (%)=[(T2-T1) / T1]×100. The thicknesses T1 and T2 are measured under no load using a height gauge (manufactured by Mitutoyo Corporation). In addition, the fibers may be raised on the non-raised surface 11b of the base nonwoven fabric 11 as well.

[0046] For example, a hot melt adhesive is used to fix and support the superabsorbent polymer 12 between the multiple raised fibers 11x arranged upright on the raised surface 11a of the base nonwoven fabric 11. 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 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 can be used. The content of the hot melt adhesive is, for example, 10 g / m2 from the viewpoint of not impairing the absorbency of the superabsorbent polymer and the feel on the skin when worn. 2 The range is as follows:

[0047] (Superabsorbent polymer) The superabsorbent polymer 12 used in the bulky porous layer 21 and the absorbent sheet 24 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, alkali metal polyacrylates are more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymers can be used alone or in combination of two or more.

[0048] 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 the superabsorbent polymer 12 that has poor flowability as a powder and using a superabsorbent polymer having a median particle size, it is possible to improve the basic performance regarding absorption and reduce the rough feel caused by the hardening of the fluff absorbent body 21. 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.

[0049] <Carrier sheet> In this embodiment, the absorbent 20 (bulky porous layer 21) before being wrapped in the absorbent sheet 24 may be entirely wrapped in a carrier sheet (not shown). As the carrier sheet, any hydrophilic sheet commonly used in this field may be used, and examples thereof include hydrophilic nonwoven fabrics such as thermal bonded nonwoven fabrics, spunbonded nonwoven fabrics, airlaid nonwoven fabrics, air-through nonwoven fabrics, and pulp-containing nonwoven fabrics, tissue paper, and absorbent paper. Among hydrophilic nonwoven fabrics, hydrophilic nonwoven fabrics such as thermal bonded nonwoven fabrics, spunbonded nonwoven fabrics, air-through nonwoven fabrics, and pulp-containing nonwoven fabrics are more preferred, and air-through nonwoven fabrics, pulp-containing nonwoven fabrics, spunbonded nonwoven fabrics, and the like are even more preferred. The thickness of the carrier sheet 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:

[0050] <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.

[0051] 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.

[0052] <3D gathers> The three-dimensional gathers 40 are fixed to the skin side of the top sheet 10 near both widthwise ends of the absorbent section 55 along the length of the absorbent section 55 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 stretchable member 40a and a water-repellent and / or waterproof sheet member 40b.

[0053] The elastically stretchable member 40a is disposed in the vicinity of the free end (other end) of the sheet member 40b along the length 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.

[0054] 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.

[0055] <Method of manufacturing absorbent articles> The absorbent article 50 can be manufactured by a known manufacturing method, and examples of such manufacturing methods include a step of arranging the absorbent body 20 or the absorbent body 20 folded in a C-shape with the absorbent sheet 24 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, a step of providing three-dimensional gathers 40 at predetermined positions on the back sheet 30 and the top sheet 10 to obtain an absorbent section 55, a step of producing an exterior body 60 of a predetermined shape as shown in FIG. 2 using a nonwoven fabric or the like, a step of attaching the absorbent section 55 to a predetermined position on the exterior body 60, and a step of forming the exterior body 60 to which the absorbent section 55 is attached into a pants-type external shape. The absorbent article 50 is then folded along a predetermined fold line and individually packaged in a package to obtain a product. In addition, the absorbent section 55 can be provided with leg gathers, waist gathers, side flaps, or the like as necessary.

[0056] 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

[0057] The present embodiment will be described more specifically below with reference to examples and comparative examples.

[0058] (Examples 1 to 6 and Comparative Examples 1 to 3) As the absorbent article, a disposable pants-type diaper was prepared. Soft urethane foam (skeleton surface is hydrophilic, basis weight 80g / m 2 , thickness 2.0mm, apparent density 140kg / m 3) and two sheets of bulky porous layers shown in Table 1 were used, aligned so that the grooves faced each other to form hollow flow paths, and bonded with a hot melt adhesive to prepare absorbent bodies of Examples 1 to 6. In addition, absorbent bodies made of 16 g of superabsorbent polymer were prepared as absorbent bodies of Comparative Examples 1 to 3. Next, air-through nonwoven fabric (grammage 60 g / m 2 One side of the nonwoven fabric (0.96 mm thick, 2.0 dtex fiber) was subjected to a nap raising treatment using a rotary saw blade to prepare a base nonwoven fabric with a nap raising rate of 25% and a thickness of 1.2 mm after raising. A highly absorbent polymer was applied to the raised surface of the base nonwoven fabric at a rate of 280 g / m 2 The mixture was fixed and supported with a hot melt adhesive to form a fixed support layer, thereby preparing an absorbent sheet.

[0059] Top sheet with a basis weight of 30 g / m 2 Air-through nonwoven fabric, 32g / m2 as backsheet 2 Each absorbent body obtained above was placed between the top sheet and the back sheet of a breathable polyethylene film, and two sheets of polypropylene spunbond nonwoven fabric (basis weight 20 g / m) were used as the outer body. 2 ) were used to prepare disposable pants-type paper diapers of Examples 1 to 6 and Comparative Examples 1 to 3.

[0060] The following evaluation tests were carried out on the disposable pants-type paper diapers obtained above in Examples 1 to 6 and Comparative Examples 1 to 3. The results are shown in Table 1. <Absorption speed 3 times method> Bottom area 16.8cm 2 A measuring tool with a weight of 755.6 g and a hole with an inner diameter of 19 mm was placed on the center of the lengthwise and widthwise directions of the pants-type absorbent article, and 150 ml of saline was dropped from the hole at the top. The time was measured from the point when the saline came into contact with the pants-type absorbent article to the point when the liquid was completely absorbed into the circumference of the center circle of the tool (first time). The same time was then measured after 3 minutes had passed (second time), and a third time was measured in the same way. <Amount of liquid returning> With the top sheet facing up, 500 ml of saline was poured towards the centre of the absorbent body and left for 10 minutes. After that, a filter paper (Advantec No. 2 filter paper, diameter 55 mm) whose weight had been measured in advance was placed on the area where the saline was absorbed, and a pressure of 35 kgf / cm was applied on top of it. 2 A weight was placed on the filter paper, and after 60 seconds, the weight of the filter paper was measured. The difference in the weight of the filter paper was recorded as the amount of liquid returned. <Wearing comfort: softness before absorption> Twenty panelists chose "soft" or "hard" for the softness before absorption. The survey was conducted by selecting the products and evaluating them according to the following criteria. The results are shown in Table 1. ◎: When 16 to 20 people choose "soft" ○: When 11 to 15 people choose "soft" △: When 6 to 10 people choose "soft" ×: When there are no "soft" people or when there are 1 to 5 people <Wearing comfort: No discomfort due to change in thickness after absorption> Twenty panelists rated the effect of the thickness change after absorption as "not uncomfortable" and "not uncomfortable." The survey was conducted by selecting either "There is a feeling of discomfort" or "There is no discomfort," and the evaluation was conducted according to the following criteria. The wearing evaluation was carried out by 0 panelists. The results are shown in Table 1. ◎: When 16 to 20 people feel "natural" ○: When 11 to 15 people answered "No discomfort" △: When 6 to 10 people answered "No discomfort" <Leaking body fluids> The subjects were asked to wear each of the disposable pants-type paper diapers of Examples 1 to 6 and Comparative Examples 1 to 3, and 20 panelists judged whether there was leakage and rated according to the following criteria. ◎: When there are 16 to 20 people who are "all in one place" ○: When there are 11 to 15 people who have "no omissions" △: When there are 6 to 10 people who are "all in one place" ×: When there are no "no omissions" or when there are 1 to 5 people

[0061] [Table 1]

[0062] From Table 1, it can be seen that by using an absorbent body made of a bulky porous material as is, or by folding it into a C shape and covering it with an absorbent sheet having a highly absorbent polymer fixed between multiple brushed fibers on one surface of the base nonwoven fabric, it is possible to obtain a pants-type absorbent article that maintains a high absorption rate even after multiple absorptions, virtually prevents liquid return, has a good fit and wearing comfort, and prevents leakage of body fluids. [Explanation of symbols]

[0063] 1. Waist opening 2 Leg opening 3 Ventral region 3A, 3B Ventral torso area 4 Inseam area 5 Dorsal region 5A, 5B Dorsal torso area 10 Top sheet 11 Base nonwoven fabric 11a Brushed surface 11b Non-brushed surface 11x brushed fibers 12 Superabsorbent polymer 20 Absorber 21 Bulky porous layer 21a Skin side bulky porous layer 21b Non-skin side bulky porous layer 22 Slit-shaped space 24 Absorbent Sheet 30 Back Seat 40 Three-dimensional gathers 40a Elastic elastic member 40b Sheet member 50 Absorbent articles 55 Absorption section 55a Front side 55b Crotch 55c Rear side 60 Exterior body 61, 62, 63, 64, 65 Elastic elastic member 66 Side seal part 67 Exterior nonwoven sheet 68 Interior non-woven sheet 69 Auxiliary nonwoven sheet

Claims

1. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed therebetween, The absorbent body includes a bulky porous layer and a highly absorbent polymer fixed to the inside of the bulky porous layer, the bulky porous layer has a hollow flow path penetrating therethrough from one end to the other end in the longitudinal direction, The absorbent article has a highly absorbent polymer supported on each of the skin side and non-skin side in the flow path.

2. The present invention further includes an absorbent sheet that wraps the outer surface of the bulky porous layer, 2. The absorbent article according to claim 1, wherein the absorbent sheet comprises a base nonwoven fabric having an inner surface which is a raised surface having a plurality of raised fibers arranged upright and an outer surface which is a non-raised surface, and the superabsorbent polymer bonded between the plurality of raised fibers.

3. The absorbent body is divided into a front side portion that mainly contacts the lower abdomen of a wearer of the absorbent article, a crotch portion that is connected to the front side portion and mainly contacts the crotch portion of the wearer, and a rear side portion that is connected to the crotch portion and mainly contacts the buttocks of the wearer, 3. The absorbent article according to claim 1, wherein the crotch portion has a portion with a relatively narrow crotch width and portions connected to the front and rear of the portion with a relatively wide crotch width.

4. 4. The absorbent article of claim 3, wherein the longitudinal dimension of the absorbent body is 400 mm or more and 500 mm or less, the width dimensions of the front and rear portions are each 90 mm or more and 110 mm or less, the width dimension of the crotch width of the relatively narrow part of the crotch portion is 50 mm or more and 70 mm or less, and the longitudinal dimension of the crotch portion is 100 mm or more and 150 mm or less.

5. the bulky porous material layer has a skin-side bulky porous material layer located on the skin side, and a non-skin-side bulky porous material layer located on the non-skin side and superimposed on the skin-side bulky porous material layer, a first groove portion recessed toward the skin side and a second groove portion recessed toward the non-skin side are disposed on a mating surface of the skin-side bulky porous material layer with the non-skin-side bulky porous material layer and on a mating surface of the non-skin-side bulky porous material layer with the skin-side bulky porous material layer, the first groove portion recessed toward the skin side and the second groove portion recessed toward the non-skin side are disposed opposite each other to form the flow path; The absorbent article according to claim 1 , wherein the superabsorbent polymer is fixed to a bottom surface of the first groove portion and a bottom surface of the second groove portion.

6. The absorbent article according to claim 1 , wherein the bulky porous layer contains a hydrophilic soft urethane foam.

7. 7. The absorbent article according to claim 6, wherein the soft urethane foam has pores therein with a pore size of 0.1 mm or more and 3 mm or less, and a porosity of 70 vol. % or more and 95 vol. % or less.

8. 8. The absorbent article according to claim 1, wherein the flow path has a longitudinal dimension of 100 mm or more and 150 mm or less and a width dimension of 3 mm or more and 13 mm or less.

9. The superabsorbent polymer attached to the flow channel has a basis weight of 50 g / m ２ More than 400g / m ２ 9. The absorbent article according to claim 1, wherein:

10. The base nonwoven fabric is an air-through nonwoven fabric, and the air-through nonwoven fabric has a basis weight of 20 g / m ２ More than 200g / m ２ 10. The absorbent article according to claim 2, wherein the thickness is 0.3 mm or more and 11.0 mm or less, and the fineness of the fibers constituting the air-through nonwoven fabric is 1.6 dtex or more and 14 dtex or less.

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