Absorbent articles

Abstract

To provide an absorbent article retaining favorable fit and humor diffusibility even after absorption of humor.SOLUTION: An absorbent article 50 for inner pads comprises a top sheet 10, a back sheet 30 and an absorber 20 therebetween, and has the length of 600 to 800 mm and the width of 300 to 400 mm. The absorber 20 includes a skin-side absorber 21 and a non-skin-side absorber 22 that contain absorbent fibers and first high-absorbent polymers. The skin-side absorber 21 has an absorbent sheet 23 embedded in the skin-side surface layer. The absorbent sheet 23 causes a brushed surface 11a of a base nonwoven fabric 11 to support second high-absorbent polymers 12 with a prescribed basis weight and has the length of 160 to 740 mm and the width of 60 to 150 mm, where the base nonwoven fabric has a prescribed hydrophilicity, basis weight and apparent specific volume. A difference in surface level between a skin-side surface of the skin-side absorber 21 and a skin-side surface of the absorbent sheet 23 is 0.5 mm or less under a load of 35 g / cm2, and a diffusion sheet with a prescribed basis weight is provided between the top sheet 10 and the skin-side absorber 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Due to the recent labor shortage in nursing care sites, there is a demand for absorbent articles with high absorbency and large capacity to reduce the number of times disposable diapers are changed. Conventionally, absorbents containing a large amount of absorbent fibers such as fluff pulp and a high-absorbent polymer have been used to increase the absorbency and capacity of absorbent articles. However, such absorbent articles have a characteristic of the high-absorbent polymer, which is responsible for most of the absorption amount, that is, after absorbing bodily fluids, the article swells relatively significantly in the thickness direction. Therefore, it is difficult to avoid a feeling of pressure on the wearer due to long-term wear and multiple discharges of bodily fluids, which induces a deterioration in the fit and stuffiness, and also causes skin troubles.

[0003] With a view to making the absorbent body thinner, various thin absorbent sheets (hereinafter also referred to as "SAP sheets") have been developed and proposed in which a superabsorbent polymer (hereinafter also referred to as "SAP") is fixed between two sheets of hydrophilic nonwoven fabric with a hot melt adhesive, and which do not contain absorbent fibers such as fluff pulp.

[0004] Patent Document 1 proposes an absorbent article (claims 1 and 4) in which the absorbent is configured as a laminate of a skin-side absorbent located on the skin side of the wearer and a non-skin-side absorbent located on the non-skin side of the wearer, the skin-side absorbent is an absorbent sheet (hereinafter also simply referred to as "absorbent sheet") in which an absorbent polymer is fixed between two hydrophilic nonwoven fabrics, and the non-skin-side absorbent is a fluff absorbent (hereinafter also simply referred to as "fluff absorbent") containing absorbent fibers and a highly absorbent polymer. Patent Document 1 describes that the absorbent increases the amount of bodily fluid absorbed while preventing a decrease in the strength of the absorbent and an increase in the thickness of the absorbent. It is also said that the absorbent of Patent Document 1 can reduce backflow.

[0005] Patent Document 2 discloses an absorbent article in which a front absorbent body, a middle absorbent body and a rear absorbent body are arranged in series in the longitudinal direction in this order, the middle absorbent body is a fluff absorbent body, the front absorbent body and the rear absorbent body are absorbent sheets, the rear end of the front absorbent body is adjacent to or overlaps with the front end of the middle absorbent body, and the rear end of the middle absorbent body is adjacent to or overlaps with the front end of the rear absorbent body. Patent Document 2 describes that the absorbent article is kept thin while preventing leakage of bodily fluids. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-164633 A [Patent Document 2] JP 2020-049178 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the absorbent article described in Patent Document 1, bodily fluids in the absorbent sheet (upper absorbent element) 40 are easily diffused to the surroundings, and bodily fluids are supplied to the fluff absorbent body (lower absorbent element) 50 over a wider area (paragraph 0008). On the other hand, the fluff absorbent body 50 is formed larger in both the length and width directions than the absorbent sheet 40 (FIG. 1, etc.), and the absorbent sheet 40 and the fluff absorbent body 50 have different degrees of swelling when absorbing bodily fluids. For this reason, a step may be generated between the periphery of the absorbent sheet 40 and the surface (skin side) of the fluff absorbent body 50, or the buttocks may be compressed due to swelling after absorbing bodily fluids, resulting in a noticeable decrease in wearing comfort. In addition, when worn for a long time, the above-mentioned step is likely to cause skin troubles such as rashes on the wearer's skin. Furthermore, since the absorbent sheet is in direct contact with the wearer's skin, the wearer is likely to feel the roughness of the superabsorbent polymer before absorbing bodily fluids, and the pressure of the jelly-like superabsorbent polymer that has absorbed the bodily fluids and swelled after absorbing the bodily fluids, which also reduces the wearing comfort of the absorbent article.

[0008] The absorbent article described in Patent Document 2 uses a fluff absorbent body and an absorbent sheet in combination to increase the amount of body fluid absorbed, but since there is an area where the absorbent sheet contacts the wearer's skin, the roughness and pressure of the absorbent polymer are easily felt, and the wearing comfort is not fully satisfactory. In addition, since the fluff absorbent body and the absorbent sheet have different absorption speeds and amounts of body fluid, when a large amount of body fluid is discharged at one time, there is a tendency for steps to occur and for side leakage of body fluid to occur at the boundary area between the fluff absorbent body and the absorbent sheet.

[0009] Patent Documents 1 and 2 do not describe a structure or method for preventing the occurrence of unevenness due to differences in swelling properties between the fluff absorbent and the absorbent sheet when a fluff absorbent is used in combination with an absorbent sheet, even when body fluids are repeatedly absorbed, maintaining good fit, and preventing skin problems for the wearer.

[0010] An object of the present invention is to provide an absorbent article which prevents the occurrence of unevenness even after multiple body fluid absorptions during long-term use, maintains a good fit, and has excellent body fluid diffusibility. [Means for solving the problem]

[0011] As a result of intensive research by the inventors to solve the above problems, it was discovered that a desired absorbent article can be obtained by providing a through-hole region in the thickness direction at the center of the surface direction of the skin-side absorbent body and fitting the above-mentioned absorbent sheet in an absorbent article including an absorbent body using a combination of a fluff absorbent body and an absorbent sheet, the fluff absorbent body including a skin-side absorbent body arranged on the skin side and a non-skin-side absorbent body arranged on the non-skin side, using a specific absorbent sheet having a superabsorbent polymer fixedly supported between the raised fibers, and providing a through-hole region in the thickness direction at the center of the surface direction of the skin-side absorbent body, and fitting the above-mentioned absorbent sheet in the through-hole region, thereby completing the present invention. That is, the present invention relates to the following absorbent article.

[0012] (1) An absorbent article used as an inner pad, comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent disposed therebetween, The length dimension is 600mm to 800mm, and the maximum width dimension is 300mm to 400mm. the absorbent body includes a skin-side absorbent body arranged on the skin side and a non-skin-side absorbent body arranged on the non-skin side, the skin-side absorbent body and the non-skin-side absorbent body each containing absorbent fibers and a first highly absorbent polymer; the skin-side absorbent body has an absorbent sheet embedded in approximately the center in the width direction of the skin-side surface layer of the skin-side absorbent body, the absorbent sheet being a bulky hydrophilic sheet having one side raised to support a second superabsorbent polymer, and having a length dimension of 160 mm to 740 mm and a width dimension of 60 mm to 150 mm; The skin-side absorbent body has a minimum width dimension equal to or larger than the width dimension of the non-skin-side absorbent body, a maximum width dimension of 230 mm to 360 mm, a minimum width dimension of 120 mm to 250 mm, and a length dimension of 470 mm to 740 mm, and a basis weight of the absorbent fibers of 180 g / m 2 More than 390g / m 2 The first superabsorbent polymer has a basis weight of 70 g / m 2 More than 270g / m 2 is as follows: The hydrophilic sheet is made of a hydrophilic air-through nonwoven fabric having a water permeability of 10 points or more in the first pass and 9 points or more in the second pass, as measured by the hydrophilicity measurement method described below. The hydrophilic air-through nonwoven fabric has a basis weight of 55 g / m 2 More than 110g / m 2 and the second superabsorbent polymer has a basis weight of 70 g / m on the raised side. 2 More than 320g / m 2 The apparent specific volume of the raised side in the unloaded state is 35 cm 3 / g or more 120cm 3 / g or less, When the absorbent article is placed on a flat, smooth surface, the difference in level between the skin side of the skin-side absorbent body and the skin side of the absorbent sheet is 35 g / cm 2 0.5mm or less under load, A diffusion sheet made of a hydrophilic sheet is disposed between the top sheet and the skin-side absorbent body, covering the skin-side surface of the absorbent sheet, and the diffusion sheet has a basis weight of 30 g / m 2 More than 70g / m 2 An absorbent article comprising: (Hydrophilicity measurement method) Place the sample on 2 sheets of absorbent paper x 5 sets = 10 sheets, and place the 10-point measurement plate on top. Drop one drop (0.05 mL) of 37°C 0.9% saline solution onto each of the 10 points, and count the number of points absorbed within 2 seconds as the number of times water permeates. Repeat dropping onto the same points every 3 minutes. (2) The absorbent sheet has a basis weight of the second superabsorbent polymer of 30 g / m2 or more within an area of ​​10% to 20% of the length direction of the absorbent sheet. 2 The absorbent article of (1) above, having the following regions: (3) An absorbent article according to (1) or (2) above, wherein the vortex speed of the first superabsorbent polymer used in the skin-side absorbent body is 30 seconds or more and 70 seconds or less, and the vortex speed of the second superabsorbent polymer used in the absorbent sheet is 1 second or more and 30 seconds or less. Effect of the Invention

[0013] According to the present invention, there is provided an absorbent article which prevents the occurrence of unevenness even after multiple body fluid absorptions during long-term use, maintains a good fit, and has excellent body fluid diffusibility. [Brief description of the drawings]

[0014] [Figure 1] 1 is a plan view showing 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] FIG. 2 is an exploded perspective view showing a schematic configuration of an absorbent body. [Figure 4] FIG. 2 is a schematic cross-sectional view in the thickness direction showing the configuration of the skin-side absorbent body. [Diagram 5] FIG. 1 is a schematic plan view showing the arrangements (a) to (e) of absorbent sheets in a skin-side absorbent body. [Figure 6] FIG. 11 is a schematic plan view showing the configuration of an absorbent sheet in another embodiment. [Figure 7] FIG. 2 is a schematic diagram showing the absorbent article according to the present embodiment worn on the side in a supine position. [Figure 8] 1 is a schematic diagram showing an absorbent article according to an embodiment of the present invention worn in a supine position on the front. FIG. [Figure 9] FIG. 2 is a schematic diagram showing a method for measuring hydrophilicity. 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 are absorbed or not. In an absorbent article, the length direction (or longitudinal direction) is the direction shown by Y in the figure that extends from the front to the back of the body via the wearer's crotch when the absorbent article is worn on the body, the width direction is the direction shown by X in the figure that is perpendicular to the length direction, and the thickness direction is the direction shown by Z in the figure 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 clothes or faces the clothes. Bodily 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. Figures 1 and 2 show the absorbent article 50. Figures 3 to 6 show the absorbent body 20. 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 this embodiment can be suitably used as an inner pad to be used in combination with a paper diaper product (outer) such as pants-type paper diapers and tape-fastened paper diapers for infants and adults. The form of the inner pad is not particularly limited as long as it can be attached inside the paper diaper product, and examples thereof include a light incontinence pad and a urine absorption pad. The absorbent article 50 is not limited to being used as an inner pad, and may be used alone as a pad product. The length direction dimension (hereinafter also simply referred to as "length") of the absorbent article 50 is in the range of 600 mm to 800 mm, and the width direction dimension (maximum dimension in the width direction, hereinafter also simply referred to as "width") is in the range of 300 mm to 400 mm. By selecting the length and width from each of the above-mentioned ranges, it is possible to easily obtain the absorbent article 50 as an inner pad that can be attached inside the outer with good fit and wearing comfort (wearing comfort).

[0018] 1 and 2, the absorbent article 50 of this embodiment comprises a liquid-permeable top sheet 10 located on the skin side, a liquid-impermeable back sheet 30 arranged opposite the top sheet 10 and located on the non-skin side, an absorbent body 20 arranged between the top sheet 10 and the back sheet 30, and a pair of three-dimensional gathers 40 provided on the skin side of the top sheet 10. As shown in Figs. 2 to 4, the absorbent body 20 comprises a skin-side absorbent body 21 arranged on the skin side and containing absorbent fibers and a first superabsorbent polymer, and a non-skin-side absorbent body 22 arranged on the non-skin side and containing absorbent fibers and the first superabsorbent polymer, with an absorbent sheet 23 that does not contain absorbent fibers such as fluff pulp embedded in the approximate widthwise center of the skin side of the skin-side absorbent body 21, and a diffusive sheet 15 made of a hydrophilic sheet arranged between the top sheet 10 and the absorbent body 20 so as to cover the skin side of the absorbent sheet 23. The absorbent sheet 23 is a body fluid absorbent member having a body fluid absorbent layer in which a second superabsorbent polymer 12 is fixedly supported between multiple raised fibers 11x formed by raising one side 11a of a base nonwoven fabric 11, which is a bulky hydrophilic sheet.

[0019] According to this embodiment, in a fluff absorbent body in which the skin-side absorbent body 21 and the non-skin-side absorbent body 22 are overlapped in the thickness direction, an absorbent sheet 23 having excellent body fluid absorbency, cushioning properties in the thickness direction due to the plurality of raised fibers 11x, softness, and excellent body fluid diffusion due to the gaps between the raised fibers 11x is fitted into the widthwise center of the skin-side surface of the skin-side absorbent body 21 that mainly contacts the wearer's crotch, and the basis weights of the first superabsorbent polymer and absorbent fibers contained in the skin-side absorbent body 21, the basis weight and specific volume of the base nonwoven fabric 11, the basis weight of the second superabsorbent polymer fixedly supported on the raised surface 11a of the base nonwoven fabric 11, the basis weight of the diffusion sheet 15, etc. are set within predetermined ranges. As a result, firstly, the bodily fluid diffusion and absorption speed throughout the absorbent body 20 are maintained well even after multiple body fluid absorptions due to long-term wear, and even when the absorbent article 50 absorbs bodily fluids while under a certain load, the cushioning properties of the absorbent sheet 23 reduce the difference in swelling rate after body fluid absorption between the skin-side absorbent body 21 and the absorbent sheet 23, and the skin-side surface of the skin-side absorbent body 21 and the skin-side surface of the absorbent sheet 23 are kept almost flush, suppressing the occurrence of large differences in level that may cause a decrease in fit or skin troubles for the wearer, and thus an absorbent article 50 can be provided that is very comfortable to wear and can withstand multiple excretions of bodily fluids over a long period of time. As shown in Figures 7 and 8, when absorbent article 50 is worn, absorbent sheet 23 is disposed in an area where body pressure is likely to be applied in the supine position, where diffusion of bodily fluids is retarded and bodily fluids are likely to accumulate, but due to the action of absorbent sheet 23 described above, diffusion and absorption of bodily fluids proceeds quickly even under body pressure, and the wearing comfort is not impaired. In Figures 7 and 8, the position of absorbent sheet 23 when absorbent article 50 is worn is shown by a solid line in order to clearly show the position.

[0020] Secondly, by arranging the non-raised surface 11b of the base nonwoven fabric 11 as the skin-side surface of the absorbent sheet 23, the occurrence of a step between the skin-side surface of the skin-side absorbent body 21 and the skin-side surface of the absorbent sheet 23 is further suppressed, thereby maintaining a better wearing comfort. Thirdly, the napped surface 11a of the absorbent sheet 23, on which the plurality of napped fibers 11x are arranged, has the function of retaining body fluids immediately after they are discharged, and thus provides the effect of preventing wet-back.

[0021] Fourth, in the absorbent sheet 23, the basis weight of the second superabsorbent polymer 12 is 30 g / m2 or less in the range of 10% to 20% of the length direction dimension. 2 By configuring the absorbent article 50 to have the following regions, and / or by configuring the vortex speed of the first superabsorbent polymer (not shown) used in the skin-side absorbent body 21 to be 30 seconds or more and 70 seconds or less, and the vortex speed of the second superabsorbent polymer 12 used in the absorbent sheet 23 to be 1 second or more and 30 seconds or less, flexibility and mobility are less likely to decrease even after the absorbent article 50 has absorbed bodily fluids, and good wearability is maintained from the start to the end of use of the absorbent article 50.

[0022] The absorbent article 50 of this embodiment has the top sheet 10, the diffusive sheet 15, the absorbent body 20, and the back sheet 30 as basic constituent units, and can be modified in various known ways as necessary, such as providing the above-mentioned three-dimensional gathers 40, or providing a liquid-permeable second sheet other than the diffusive sheet 15 between the top sheet 10 and the absorbent body 20. The constituent members of the absorbent article 50 will be described in more detail below in the order of the top sheet 10, the liquid-diffusive sheet 15, the absorbent body 20, the back sheet 30, and the three-dimensional gathers 40.

[0023] <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.

[0024] 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 planar shape of the top sheet 10 (hereinafter also simply referred to as the "planar shape") is not particularly limited, and may be any shape that covers all or part of the absorbent body 20, which is necessary for guiding bodily fluids to the absorbent body 20 without leakage.

[0025] <Diffusion sheet> The diffusive sheet 15 is made of a hydrophilic sheet and is provided between the top sheet 10 and the absorbent body 20 so as to mainly cover the skin side of the absorbent sheet 23, and has the function of, for example, evenly supplying bodily fluid that has passed through the top sheet 10 to the skin-side absorbent body 21 and the absorbent sheet 23. As the liquid diffusive sheet 15, any hydrophilic sheet can be used without particular limitation, and examples thereof include hydrophilic nonwoven fabrics such as air-through nonwoven fabric, point-bonded nonwoven fabric, spunbonded nonwoven fabric, meltblown nonwoven fabric, and composite hydrophilic nonwoven fabrics such as spunbonded nonwoven fabric / meltblown nonwoven fabric laminates, and spunbonded nonwoven fabric / meltblown nonwoven fabric / spunbonded nonwoven fabric laminates.

[0026] The basis weight of the diffusion sheet 15 is 30 g / m 2 More than 70g / m 2 By selecting the basis weight of the diffusive sheet 15 from the above range, bodily fluids can be distributed evenly over the entire skin side of the absorbent sheet 23, and the entire absorbent sheet 23 can be used to absorb bodily fluids. 2 If the basis weight is less than 70 g / m, bodily fluids tend to be supplied locally to the absorbent sheet 23, and the entire absorbent sheet 23 tends not to be uniformly utilized. 2 If the thickness exceeds this range, the bodily fluid permeability of the diffusive sheet 15 becomes insufficient, and wet-back tends to occur easily. In addition, the overlapping portion of the diffusive sheet 15 and the absorbent sheet 23 tends to feel hard to the touch, and the fit tends to deteriorate. The planar shape of the diffusive sheet 15 may be, for example, a shape that covers all or part of the skin side of the absorbent sheet 23.

[0027] <Absorbent> The absorbent body 20 is disposed between the diffusive sheet 15 and the back sheet 30 in the thickness direction, and absorbs and retains, for example, bodily fluids that have permeated through the top sheet 10 and the diffusive sheet 15. As shown in Figures 2 to 4, the absorbent body 20 comprises a skin-side absorbent body 21 disposed on the skin side, a non-skin-side absorbent body 22 disposed on the non-skin side, and an absorbent sheet 23 fitted into the skin-side surface of the skin-side absorbent body 21 at approximately the center in the width direction.

[0028] <Absorbent material on the skin side> The skin-side absorbent body 21 is a fluff absorbent body containing absorbent fibers and a first superabsorbent polymer (not shown, the same applies below), and in this embodiment has an hourglass-shaped planar shape, with the dimension (minimum dimension) of the widthwise minimum part that mainly abuts against the wearer's crotch being equal to or larger than the widthwise dimension of the non-skin-side absorbent body 22, the widthwise dimension of the maximum part (both ends in the lengthwise direction) being in the range of 230 mm to 360 mm, the widthwise dimension of the minimum part (near the center in the lengthwise direction, the part that mainly abuts against the wearer's crotch) being in the range of 120 mm to 250 mm, and the lengthwise dimension being in the range of 470 mm to 740 mm. By having these dimensions, the rigidity of the absorbent body 20 as a whole and the absorption performance (absorption amount, absorption speed) of the absorbent article 50 as a whole can be maintained at a high level, while the absorbent sheet 23 inside it can be stably held, and the absorbent sheet 23 can be prevented from falling off from the skin-side absorbent body 21.

[0029] The absorbent fiber basis weight of the skin side absorbent body 21 is 180 g / m 2 More than 390g / m 2 and the basis weight of the first superabsorbent polymer is 70 g / m 2 More than 270g / m 2 The range is as follows. By setting the basis weights of the absorbent fibers and the first superabsorbent polymer within the above-mentioned ranges, it is possible to achieve a high level of absorption performance, rigidity, and fit of the skin-side absorbent body 21, and further to ensure that the absorbent sheet 23 is held by the skin-side absorbent body 21. The absorbent fibers and the first superabsorbent polymer will be described later.

[0030] The skin-side absorbent body 21 has a recess 24 (a through-hole that penetrates in the thickness direction in this embodiment) recessed toward the non-skin side in a region that mainly abuts against the wearer's crotch near the center of the width of the skin-side surface, and the absorbent sheet 23 is fitted into this recess 24. The recess 24 is formed, for example, from the center of the width of the skin-side absorbent body 21 to a position that is approximately equidistant on both sides. The length and width dimensions of the recess 24 are formed to be the same as or slightly larger than the length and width dimensions of the absorbent sheet 23. Since the absorbent sheet 23 has an appropriate cushioning property, the skin-side surface of the skin-side absorbent body 21 and the skin-side surface of the absorbent sheet 23 are approximately flush with each other under body pressure when the absorbent article 50 is worn, and even after absorbing bodily fluids, there is no significant change to the above-mentioned flush state, and the occurrence of a step that may adversely affect the balance of the wearer's skin is suppressed.

[0031] <Absorbent core not on the skin side> The non-skin-side absorbent body 22 is a fluff absorbent body that contains absorbent fibers and a first superabsorbent polymer and is disposed on the non-skin-side of the skin-side absorbent body 21. In this embodiment, the planar shape of the non-skin-side absorbent body 22 is substantially rectangular, but is not limited thereto, and examples thereof include an hourglass shape, an I-shape, an oval shape, an ellipse shape, and a rounded rectangle with four rounded corners. In a preferred embodiment, the length and width dimensions of the non-skin-side absorbent body 22 are formed slightly larger than the length and width dimensions of the absorbent sheet 23, respectively. According to this embodiment, for example, when the recess 24 of the skin-side absorbent body 21 is the through-hole of this embodiment, it is possible to prevent the absorbent sheet 23 from falling off from the skin-side absorbent body 21, particularly after absorbing body fluids multiple times.

[0032] In the non-skin side absorbent body 22, the basis weight of the absorbent fiber is, for example, 100 g / m 2 More than 800g / m 2 Below range or 180g / m 2 More than 450g / m 2 The basis weight of the first superabsorbent polymer in the non-skin side absorbent body 22 is, for example, 50 g / m 2 More than 800g / m 2The following range or 90g / m 2 More than 400g / m 2 The basis weight of the first superabsorbent polymer is within the range described above. By selecting the basis weight of the first superabsorbent polymer from the above-mentioned range, gel blocking in the non-skin side absorbent body 22 can be prevented, and the non-skin side absorbent body 22 can absorb body fluids multiple times. In the non-skin side absorbent body 22, the ratio of the weight of the first superabsorbent polymer to the total weight of the non-skin side absorbent body 22, (weight of first superabsorbent polymer / total weight of non-skin side absorbent body 22)×100(%), is, for example, in the range of 15% by weight or more, or in the range of 15% by weight or more and 70% by weight or less.

[0033] (Absorbent fiber) The absorbent fiber is not particularly limited as long as it is generally used in absorbent articles such as sanitary napkins, paper diapers, and urine pads, and examples thereof include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic nonwoven fabric, etc. Among these, fluff pulp is preferred from the viewpoint of absorbency. Examples of fluff pulp include wood pulp (e.g., coniferous bleached kraft pulp (N-BKP) such as southern pine and Douglas fir), synthetic fiber, resin fiber, cotton-like defibrated material such as non-wood pulp, etc.

[0034] (First superabsorbent polymer) The first superabsorbent polymer refers to a superabsorbent polymer commonly used in this field. The superabsorbent polymer 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 absorption per weight, polyacrylates are preferred, polyacrylic acid alkali metal salts are more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymers can be used alone or in combination of two or more.

[0035] The superabsorbent polymer is used in the form of, for example, particles or fibers, 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 finely powdered superabsorbent polymer having poor flowability as a powder and using a superabsorbent polymer having a median particle size, it is possible to improve basic absorption performance and reduce the rough feel caused by the hardening of the skin-side absorbent body 21 and the non-skin-side absorbent body 22. The median particle size of the superabsorbent polymer is, for example, in the range of 50 μm to 600 μm or in the range of 100 μm to 500 μm.

[0036] The form of the absorbent fiber and the superabsorbent polymer in the skin side absorbent body 21 and the non-skin side absorbent body 22 can be, for example, a mixture of absorbent fiber and SAP particles molded into a specific shape, a laminated mat in which absorbent fiber and SAP particles are laminated, etc. Examples of the specific shape can be a plate shape, an hourglass shape, a gourd shape, etc.

[0037] <Absorbent sheet> 2 to 4, the absorbent sheet 23 is fitted into a recess 24 (a through-hole in this embodiment) having an opening on the skin side surface of the skin side absorbent body 21, and comprises a base nonwoven fabric 11 as a hydrophilic sheet, one surface of which is a raised surface 11a on which a plurality of raised fibers 11x are arranged upright by a raising process, and the other surface of which is a non-raised surface 11b, and a second highly absorbent polymer 12 fixedly supported between the raised fibers 11x to form a bodily fluid absorbent layer. In this embodiment, the base nonwoven fabric 11 is fitted into the recess 24 of the skin side absorbent body 21 so that the non-raised surface 11b of the base nonwoven fabric 11 becomes the skin side surface of the absorbent sheet 23. In this embodiment, the absorbent sheet 23 is entirely wrapped in a wrapping sheet (not shown). By having a raised surface 11a on which a plurality of raised fibers 11x are arranged, the material has excellent cushioning properties and flexibility, and by having spaces between the raised fibers 11x, the material exhibits good bodily fluid diffusion properties and anti-wetback properties even after absorbing bodily fluids multiple times.

[0038] The plurality of raised fibers 11x standing on the raised surface 11a of the base nonwoven fabric 11 are formed by subjecting the surface of the base nonwoven fabric 11 to a raising process such as a nap raising process. The plurality of raised fibers 11x of the base nonwoven fabric 11 imparts an appropriate thickness and softness to the absorbent sheet 23 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 second highly absorbent polymer 12 can be dispersed and fixed between the raised fibers 11x while maintaining the spaces 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.

[0039] 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.

[0040] The absorbent sheet 23 has a length dimension in the range of 160 mm to 740 mm, and a width dimension in the range of 60 mm to 150 mm. With these dimensions, the absorbent sheet 23 can easily come into contact with the wearer's crotch area, and can smoothly absorb bodily fluids in response to discharge of bodily fluids. If the length dimension and / or width dimension are less than the respective lower limit values ​​mentioned above, the bodily fluid diffusion in the absorbent body 20 tends to be insufficient, and the absorption rate tends to decrease. If the length dimension and / or width dimension exceed the respective upper limit values ​​mentioned above, the durability during wearing is insufficient, and the absorbent sheet 23 tends to easily fall off from the skin-side absorbent body 21.

[0041] The hydrophilic sheet constituting the base nonwoven fabric 11 is made of a hydrophilic air-through nonwoven fabric that has a water permeation number of 10 points or more in the first pass and 9 points or more in the second pass, as measured by the hydrophilicity measurement method described below. The hydrophilic air-through nonwoven fabric has a basis weight of 55 g / m 2 More than 110g / m 2 The second highly absorbent polymer 12 fixedly supported between the plurality of raised fibers 11x on the raised surface 11a has a basis weight of 70 g / m 2 More than 320g / m 2 The apparent specific volume of the base nonwoven fabric 11 with no load on the raised surface 11a is 35 cm 3 / g or more 120cm 3 / g or less, and further, when the absorbent article 50 is placed or laid on a flat, smooth surface without being folded, the difference in level between the skin side surface of the skin-side absorbent body 21 and the skin side surface of the absorbent sheet 23 is 35 g / cm 2 The apparent specific volume is calculated by dividing the thickness of one sheet of the base nonwoven fabric 11 by the basis weight, and expressing the volume cm per 1 g. 3 This is expressed as:

[0042] By setting the basis weight of the second superabsorbent polymer 12 forming the bodily fluid absorbent layer on the napped surface 11a of the base nonwoven fabric 11 and / or the apparent specific volume of the base nonwoven fabric 11 in a no-load state on the napped surface 11a within the above-mentioned ranges, it is possible to maintain a high level of absorption performance such as absorption amount and absorption speed from the start to the end of use of the absorbent article 50 without causing inconvenience such as gel blocking or a decrease in fit. 2 This load is the average body pressure applied to the absorbent body 20 when the absorbent article 50 is worn. This indicates that when the absorbent article 50 is worn, the difference in level between the skin side of the skin-side absorbent body 21 and the skin side of the absorbent sheet 23 is 0.5 mm or less. If the difference in level is 0.5 mm or less, it is possible to significantly reduce the cause of skin troubles for the wearer.

[0043] (Hydrophilicity measurement method) 1. Test item: Repeated point absorption 2. Purpose of Repeated Point Absorption Test This is the process of confirming the degree to which a certain amount of test liquid can be repeatedly absorbed when it is injected at a certain time interval into a specific location on the specimen. The higher the hydrophilicity, the more times it can be repeatedly absorbed. 3. Repeated point absorption test method As shown in Figure 9, a specimen 60 is placed on a mount 61 made of 2 sheets of absorbent paper x 5 sets = 10 sheets stacked together, a 10-point measurement plate 62 is placed on top, and one drop (0.05 mL) of 37°C 0.9% saline urine is dripped onto each of the 10 points using a dropper 63. The number of points absorbed within 2 seconds is counted and used as the number of times water is permeated. The dripping is repeated at the same points every 3 minutes.

[0044] As shown in Fig. 3, the absorbent sheet 23 of this embodiment has a substantially band-like shape extending in the length direction in plan view to correspond to the recesses 24 (through-holes in this embodiment) formed to extend from one end in the length direction to the other end of the skin side absorbent body 21, leaving both widthwise ends. This is the same as the combination of the skin side absorbent body 21a and absorbent sheet 23a shown in Fig. 5(a). The combination of the skin side absorbent body 21 and absorbent sheet 23 is not limited to this embodiment, and may be a combination of a skin side absorbent body 21b having a rectangular recess arranged in the center of each of the length and width directions and having a lengthwise dimension longer than the widthwise dimension, and an absorbent sheet 23b having a planar shape corresponding to the planar shape of the recess (Fig. 5(b)); a skin side absorbent body 23c having two rectangular recesses whose lengthwise dimension is longer than the widthwise dimension, arranged at a predetermined interval in the length direction, and two rectangular recesses having a planar shape corresponding to the planar shape of the recess (Fig. 5(c)); Examples of such a combination include a combination with absorbent sheet 23c (Figure 5(c)), a combination of skin-side absorbent body 21d having a rectangular recess that is longer in the width direction than in the length direction and provided at the rear side that abuts from the crotch to the buttocks of the wearer, and absorbent sheet 23d having a planar shape corresponding to the planar shape of the aforementioned recess (Figure 5(d)), and a combination of skin-side absorbent body 21e having a narrow band-shaped recess that extends in a band-like shape in the central portion in the length direction, and absorbent sheet 23e having a planar shape corresponding to the planar shape of the aforementioned recess (Figure 5(e)).

[0045] (Second superabsorbent polymer) The second superabsorbent polymer 12 is a superabsorbent polymer commonly used in this field, similar to the first superabsorbent polymer. Therefore, the second superabsorbent polymer 12 can be any of the various superabsorbent polymers exemplified as the first superabsorbent polymer in the same embodiment as the first superabsorbent polymer. For example, a hot melt adhesive is used to fix and support the second superabsorbent polymer 12 to the raised fiber 11x. 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, and 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 / m from the viewpoint of not impairing the absorbency of the highly absorbent polymer and the feel on the skin when worn. 2 The range is as follows:

[0046] In a preferred embodiment of the absorbent sheet 23, the second superabsorbent polymer 12 has a basis weight of 30 g / m2 or less in a range of 10% to 20% of the length direction dimension. 2 The absorbent article 50 has the following low basis weight regions. In FIG. 6, the absorbent sheet 23e shown in FIG. 5(e) extends in a narrow strip shape in the length direction, and the low basis weight regions 26 are formed between the normal basis weight regions 25, and the ratio of the length dimension of the low basis weight regions 26 to the length dimension of the absorbent sheet 23e is configured to be in the range of 10% to 20%. According to this embodiment, even after multiple body fluid absorptions, the flexibility and mobility of the absorbent sheet 23e are unlikely to decrease, and the absorbent article 50 as a whole maintains better wearability. If the ratio is less than 10%, the effect of providing the low basis weight regions 26 tends to be insufficient. If the ratio is more than 20%, the absorption performance of the absorber 20 as a whole tends to decrease.

[0047] In another preferred embodiment of the absorbent sheet 23, the vortex speed of the first superabsorbent polymer used in the skin-side absorbent body 21 is 30 seconds or more and 70 seconds or less, and the vortex speed of the second superabsorbent polymer 12 used in the absorbent sheet 23 is 1 second or more and 30 seconds or less. According to this embodiment, even after multiple body fluid absorptions, the flexibility and mobility of the absorbent sheet 23 are less likely to decrease, and better wearability is maintained as a whole for the absorbent article 50. Since superabsorbent polymers having various vortex speeds, which are obtained by selecting the manufacturing method and raw materials, can be appropriately selected from these polymers that fit the above-mentioned ranges.

[0048] The vortex absorption rate (seconds) of the superabsorbent polymer is determined by placing 50.0 ml (±0.5 ml) of saline solution with a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) in an experimental glass container, then adding 2.00 g (±0.02 g) of superabsorbent polymer into the container while stirring at 600 rpm (±30 rpm) so that the saline solution in the container forms a vortex, and measuring the time (seconds) from the moment the superabsorbent polymer 12 is placed in the container until the vortex disappears and the liquid level becomes horizontal.

[0049] (packaging sheet) The packaging sheet is a hydrophilic sheet, and is provided so as to wrap the entire absorbent sheet 23 as necessary. The packaging sheet, for example, diffuses the body fluid almost uniformly throughout the body fluid absorbent layer, and prevents the second superabsorbent polymer 12 from falling off from the body fluid absorbent layer. When wrapping the absorbent sheet 23 in the packaging sheet, for example, the body fluid absorbent layer of the absorbent sheet 23 is placed near the center of the width of the packaging sheet, and the packaging sheet and the body fluid absorbent layer are bonded together with a hot melt adhesive or the like as necessary, and then both widthwise ends of the packaging sheet are folded toward the non-raised surface 11b of the absorbent sheet 23 to form a C-fold.

[0050] The hydrophilic sheet constituting the packaging sheet may be any sheet commonly used in this field, 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, absorbent paper, etc. 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, etc. are even more preferred. The thickness of the packaging sheet is in the range of 0.10 mm to 0.25 mm, and the basis weight is 5 g / m 2 More than 40g / m 2 The range is as follows:

[0051] <Back sheet> The back sheet 30 may be formed using a liquid-impermeable substrate that prevents the body fluid held by the absorber 20 from wetting clothing, and 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.

[0052] The basis weight of the back sheet 30 is, for example, 15 g / m 2 More than 60g / 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.

[0053] <3D gathers> The three-dimensional gathers 40 are fixed to the skin side of the top sheet 10 along the length of the absorbent article 50 near both ends in the width 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 stretchable member 40a and a water-repellent and / or waterproof sheet member 40b.

[0054] 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.

[0055] 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.

[0056] <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.

[0057] 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

[0058] The present embodiment will be described more specifically below with reference to examples and comparative examples.

[0059] (Examples 1 to 4 and Comparative Examples 1 to 7) Air-through nonwoven fabric (grammage 25g / m) as the top sheet 2 ) was used to prepare an absorbent having the configurations shown in Tables 1 and 2 (the raised surface was physically raised with a rotary saw blade to a predetermined apparent specific volume (cm 3 A breathable polyethylene sheet (basis weight 30 g / m) was used as a liquid-impermeable back sheet. 2 ) was used for the three-dimensional gathers, and a composite nonwoven fabric (basis weight 15 g / m2) was used, which is a laminate of spunbond nonwoven fabric, meltblown nonwoven fabric, and spunbond nonwoven fabric. 2 ) was used to prepare absorbent articles (urine absorption pads) of Examples 1 to 4 and Comparative Examples 1 to 7.

[0060] In Comparative Example 1, no absorbent sheet was used, and only a fluff absorbent body containing fluff pulp and a highly absorbent polymer was used. In Comparative Example 2, an absorbent sheet was placed on the skin side of the skin-side absorbent body. Comparative Examples 3 to 7 have the configurations shown in Tables 1 and 2.

[0061] The urine absorption pads of Examples 1 to 4 and Comparative Examples 1 to 7 obtained above were used in combination with tape-fastened disposable diapers to carry out the following evaluations. The results are shown in Table 3.

[0062] <Monitor evaluation after wearing for one week> With the cooperation of eight disposable diaper wearers (user monitors) who spend their daily lives mainly lying down (supine position) and eight caregiver monitors who assist the user monitors, the user monitors observed the comfort and fit (softness of wear, ease of movement) of each urine absorption pad of Examples 1 to 4 and Comparative Examples 1 to 7 when worn by the user monitors in combination with a tape-fastened disposable diaper, and the caregiver monitors observed the skin condition of the wearer, and evaluated them according to the following criteria. The wearers used the pads for 8 hours each time for one week, and the evaluation was performed on daily activities such as changing posture when sleeping, eating, and undressing. When 6 to 8 people rated "good, comfortable to wear, and no redness on the skin," the rating was given as "O." When 3 to 5 people rated "good, comfortable to wear, and no redness on the skin," the rating was given as "△." When 2 or less people rated "good, comfortable to wear, and no redness on the skin," the rating was given as "X."

[0063] <Absorption speed> The urine absorption pad was stretched out flat and fixed in an open state, and a cylindrical absorption rate tool with an inner diameter of 30 mm was placed at the center of the width and length of the skin contact side of the urine absorption pad, and 150 ml of 0.9% saline was poured in each time, and the time until the liquid level was absorbed on the surface of the paper diaper was measured. Three minutes after absorption, the next 150 ml was poured in, and the time until it was absorbed was measured in the same way. This operation was repeated, and the total time required for absorption of 150 ml x 3 times was taken as the absorption rate (seconds). The weight of the absorption rate tool was 35 g / cm2 The measurements were carried out under pressure.

[0064] <Difference in height between the skin-side absorbent body and absorbent sheet> 35g / cm for the skin-side absorbent body and absorbent sheet after measuring the absorption rate 2 The thickness of each was measured under load using a height gauge (trade name, manufactured by Mitutoyo Corporation), and the difference between the thickness of the skin-side absorbent body and the thickness of the absorbent sheet was determined and taken as the step.

[0065] <Reverse flow amount> The urine pad was stretched flat and fixed in an unfolded state, and 150 ml of 0.9% saline was poured into the center of the width and length of the rear side of the pad on the skin side (the area that contacts the wearer's crotch and buttocks) 8 times at 3-minute intervals, and left to stand for 10 minutes after the water was poured. Filter paper was placed in the center of the width and length of the pad on the skin side, and a weight of 35 g / m2 was placed on top of it and left to stand for 1 minute. After leaving it to stand for 1 minute, the weight was removed, and the weight of 0.9% saline absorbed by the filter paper was calculated from the weight difference before and after absorption, and this was taken as the amount of return (wet back, g).

[0066] [Table 1]

[0067] [Table 2]

[0068] [Table 3]

[0069] Example 1 By providing a large absorbent sheet in one central location on the skin-side absorbent body, as shown in Figure 5(a), good monitoring results were obtained after long-term use. It is believed that the good skin condition was due to the fact that embedding the absorbent sheet increased the absorbency of the absorbent article surface while suppressing the occurrence of unevenness and steps. Example 2 As shown in Figure 5(b), even when two small absorbent sheets were placed at intervals in the longitudinal direction on the skin-side absorbent body, good monitoring results were obtained after long-term use. In particular, male wearers (4 / 8 people) commented that they felt less urine running down the skin and staying inside the absorbent article. It is believed that the diffusion on the front side was good even after absorption. Example 3 By providing a slit-shaped absorbent sheet extending longitudinally in the widthwise center of the skin-side absorbent body as shown in Figure 5(e), the swelling around the sacrum after absorption when in the supine position was suppressed, and effective absorption was achieved even under body pressure, maintaining good skin condition. Example 4 In the absorbent sheet shown in Figure 5(e), a comment was received that the feeling of pressure after wearing for a long time was slightly reduced when an absorbent sheet with non-supported areas of superabsorbent polymer as shown in Figure 6 was used. It is considered that the non-supported areas maintained flexibility in the length direction even after the superabsorbent polymer swelled due to the absorption of bodily fluids, suppressing the decrease in fit. In addition, the absorbent articles according to Examples 1 to 4 reduce costs compared to the case where the absorbent body is made of three layers. Comparative Example 1 Since this absorbent does not use an absorbent sheet and contains fluff pulp and highly absorbent polymer, it was evaluated that there was no difference in level between different absorbents. The absorbency of the surface was insufficient when used for a long time, the amount of return increased after repeated absorption, and redness was observed on the skin after wearing. Comparative Example 2 When an absorbent sheet was placed on the skin side of the skin-side absorbent body, the absorbency was high, but after absorbing body fluids and swelling, the difference in height between the skin-side absorbent body and the absorbent sheet became large, resulting in a decrease in comfort and redness of the skin at the pressure points. The cost was also relatively high. Comparative Example 3 When an absorbent sheet having a basis weight and volume ratio of the superabsorbent polymer different from those of the present embodiment was used, the absorbent sheet did not support enough superabsorbent polymer, and the physical stress of wearing the absorbent sheet for an extended period of time caused the placement of the superabsorbent polymer to become uneven, resulting in unevenness and a feeling of pressure in some areas after swelling. Comparative Example 4 When two absorbent sheet units were embedded in the skin-side absorbent body in the width direction, the two pairs of absorbent sheets on the left and right sides peeled off from the skin-side absorbent body due to long-term absorption and the stress of wearing the garment, and absorbency and wearing comfort could not be maintained. Comparative Example 5 When the basis weight of the diffusion sheet was lower than the specified range, diffusion of body fluids over the entire area of ​​the skin-side absorbent was insufficient, and sufficient absorption performance was not obtained during repeated absorption over long periods of use, resulting in redness of the skin. Comparative Example 6 When an absorbent sheet was placed inside the non-skin side absorbent body, the absorbency was improved by the placement of the absorbent sheet. No improvement was observed, and the wearing comfort was slightly reduced due to swelling from the non-skin side. Comparative Example 7 Instead of the absorbent sheet folded in C-shape from the spunbond nonwoven fabric of Example 1, a non-brushed three-layer nonwoven fabric [air-through nonwoven fabric (basis weight 20 g / m 2 ) + Air-through nonwoven fabric (grammage 20g / m 2 ) + spunlace nonwoven fabric (grammage 35g / m 2 When an absorbent sheet was used that was not folded in a C shape and had two superabsorbent polymer-carrying layers between each layer of the absorbent sheet, the amount of backflow was reduced, but the swelling in the thickness direction due to the swelling of the superabsorbent polymer after absorbing body fluids increased, resulting in a relatively large difference in level between the skin side of the absorbent body and the skin side of the absorbent sheet, which reduced the comfort of wearing the sheet and affected the skin condition after wearing. [Explanation of symbols]

[0070] 10 Top sheet 11 Base nonwoven fabric 11a Brushed surface 11b Non-brushed surface 11x brushed fibers 12 Second superabsorbent polymer 15 Diffusion Sheet 20 Absorber 21, 21a, 21b, 21c, 21d, 21e Skin side absorbent 22 Non-skin side absorbent 23, 23a, 23b, 23c, 23d, 23e Absorbent sheets 24 Recess (through hole) 25 Normal basis weight area 26 Low basis weight area 30 Back Seat 40 Three-dimensional gathers 50 Absorbent articles 60 specimens 61 Mount 62 10-point measuring board 63 Dropper

Claims

1. An absorbent article used as an inner pad, comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed therebetween, The length direction dimension is 600 mm or more and 800 mm or less, and the maximum width direction dimension is 300 mm or more and 400 mm or less, the absorbent body includes a skin-side absorbent body arranged on the skin side and a non-skin-side absorbent body arranged on the non-skin side, the skin-side absorbent body and the non-skin-side absorbent body each containing absorbent fibers and a first highly absorbent polymer; the skin-side absorbent body has an absorbent sheet embedded in a widthwise central portion of a skin-side surface layer of the skin-side absorbent body, the absorbent sheet being a bulky hydrophilic sheet having one side raised to support a second superabsorbent polymer, the absorbent sheet having a lengthwise dimension of 160 mm or more and 740 mm or less and a widthwise dimension of 60 mm or more and 150 mm or less; The skin-side absorbent body has a minimum widthwise dimension equal to or larger than the widthwise dimension of the non-skin-side absorbent body, a maximum widthwise dimension of 230 mm to 360 mm, a minimum widthwise dimension of 120 mm to 250 mm, and a lengthwise dimension of 470 mm to 740 mm, and a basis weight of the absorbent fibers of 180 g / m ２ 390g / m or more ２ The first superabsorbent polymer has a basis weight of 70 g / m ２ More than 270g / m ２ is as follows: The hydrophilic sheet is composed of a hydrophilic air-through nonwoven fabric having a water permeability of 10 points or more in the first pass and 9 points or more in the second pass, as measured by the hydrophilicity measurement method described below. The hydrophilic air-through nonwoven fabric has a basis weight of 55 g / m ２ 110g / m or more ２ and the second superabsorbent polymer has a normal basis weight of 70 g / m on the raised side. ２ 320g / m or more ２ The apparent specific volume of the raised side in the unloaded state is 35 cm ３ / g or more 120cm ３ / g or less, The difference in level between the skin side of the skin-side absorbent body and the skin side of the absorbent sheet when the absorbent article is placed on a flat, smooth surface is 35 g / cm ２ 0.5 mm or less under load; A diffusion sheet made of a hydrophilic sheet is disposed between the top sheet and the skin-side absorbent body, covering the skin-side surface of the absorbent sheet, and the diffusion sheet has a basis weight of 30 g / m ２ 70g / m or more ２ is as follows: An absorbent article, wherein the vortex speed of the first superabsorbent polymer used in the skin-side absorbent body is 30 seconds or more and 70 seconds or less, and the vortex speed of the second superabsorbent polymer used in the absorbent sheet is 1 second or more and 30 seconds or less. (Hydrophilicity measurement method) Place the sample on 2 sheets of absorbent paper x 5 sets (10 sheets) and place the 10-point measurement plate on top. Drop one drop (0.05 mL) of 0.9% saline solution at 37°C onto each of the 10 points, and count the number of points absorbed within 2 seconds to determine the number of times water permeates. Repeat instillation into same point every 3 minutes.

2. The absorbent sheet has a base weight of 30 g / m2 or more between regions of normal base weight in a range of 10% to 20% of the length direction of the absorbent sheet. ２ 2. The absorbent article of claim 1 having the following regions:

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