Absorbent article

Abstract

To provide an absorbent article having both of thinness and water absorption and hardly shifted.SOLUTION: An absorbent article 10 includes a top sheet 11, a back sheet 12 and an absorber 13. The absorber 13 includes an upper layer absorber 15, a lower layer absorber 16, a first intermediate sheet 17 wrapping both of the upper layer absorber 15 and the lower layer absorber 16, and a second intermediate sheet 18 disposed between the upper layer absorber 15 and the lower layer absorber 16. The upper layer absorber 15 includes: 40-100 wt.% of pulp fibers having a basis weight of 50 g / m2-130 g / m2, and 0-60 wt.% of highly-absorbent polymer. The lower layer absorber 16 does not contain the pulp fibers and is constituted with the highly-absorbent polymer. The upper layer absorber 15 and the lower layer absorber 16 are provided with slits 19, 20 extending in a longitudinal direction. A plurality of protrusion parts 14 is formed on the top sheet 11, and the length of the protrusion parts 14 in the width direction is longer than the length of the protruding part 14 in the longitudinal direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to absorbent articles. [Background technology]

[0002] Patent Document 1 discloses a urine absorption pad as an absorbent article. This urine absorption pad comprises a liquid-permeable top sheet, a liquid-impermeable or water-repellent and moisture-permeable back sheet, and a water-absorbent sheet sandwiched between these two sheets. The water-absorbent sheet comprises a first sheet, a second sheet, and water-absorbent resin powder fixed between these two sheets with an adhesive. The water-absorbent sheet is an absorbent body with a so-called pulpless structure that does not contain fibers such as fluff pulp (opened pulp) fibers. The water-absorbent resin powder is granular (with numerous irregularities on the powder surface) polymer particles that absorb and swell with body fluids such as urine, and is present in large numbers between the first and second sheets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-061230 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, absorbent articles using thin absorbent bodies are in demand from the standpoints of wearing comfort, ease of movement, impact on outerwear, storage, transportability, etc. The absorbent body is made up of pulp fiber and superabsorbent polymer (hereinafter sometimes referred to as "SAP"), and while the thickness of the absorbent body can be reduced by reducing the proportion of pulp fiber, there is a problem that increasing the proportion of SAP reduces the water absorption rate. Furthermore, while the thickness of the absorbent body can be reduced by reducing the overall weight, reducing the overall weight reduces the maximum absorption capacity of the absorbent article, making it more susceptible to liquid return when a load is applied.

[0005] Furthermore, because a thin absorbent body is lightweight, it is prone to slippage when the absorbent article is worn and moved around. In particular, slippage in the front-to-back direction, with the belly side facing forward and the back side facing backward, is more likely to occur than slippage in the left-to-right direction, where movement is restricted by the base of the legs.

[0006] The absorbent article described in Patent Document 1 has a pulpless structure, which means that the absorption rate is slow and once liquid has been absorbed, the absorption performance tends to decrease. Also, because it is thin and lightweight, it tends to shift in the front and back directions when worn and moved.

[0007] Therefore, an object of the present disclosure is to provide an absorbent article that is both thin and has good water absorption performance and is less likely to slip. [Means for solving the problem]

[0008] In order to solve the above problems, a first aspect of the present invention is an absorbent article comprising a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet on the non-skin side, and an absorbent body arranged between the top sheet and the back sheet, wherein the absorbent body has an upper-layer absorbent body on the skin side, a lower-layer absorbent body on the non-skin side, a liquid-permeable first intermediate sheet that encases both the upper-layer absorbent body and the lower-layer absorbent body, and a liquid-permeable second intermediate sheet that is arranged between the upper-layer absorbent body and the lower-layer absorbent body, and the upper-layer absorbent body has a basis weight of 50 g / m 2 More than 130g / m 2 The absorbent article contains 40% by weight or more and 100% by weight or less of the following pulp fibers and 0% by weight or more and 60% by weight or less of superabsorbent polymer, the lower absorbent body does not contain pulp fibers and is made of superabsorbent polymer, the upper absorbent body and the lower absorbent body are provided with slits extending in the longitudinal direction of the absorbent article, the top sheet is formed with a plurality of protrusions that protrude toward the skin side, and the length of the protrusions along the width direction of the absorbent article is longer than the length of the protrusions along the longitudinal direction.

[0009] A second aspect of the present invention is the absorbent article of the first aspect, wherein the length of the projections of the top sheet in the longitudinal direction is 70% or less of the length of the projections in the width direction.

[0010] A third aspect of the present invention is an absorbent article according to the first or second aspect, wherein the plurality of convex portions of the top sheet form a plurality of rows extending in the width direction, the plurality of rows being arranged spaced apart from one another in the longitudinal direction, the row of convex portions being composed of a plurality of convex portions lined up in the width direction while being spaced apart from one another in the width direction, or a single convex portion extending in the width direction, and the total widthwise length of the convex portions in the row is 30% or more and 100% or less of the widthwise length of the top sheet.

[0011] A fourth aspect of the present invention is an absorbent article according to the third aspect, wherein the distance between adjacent rows in the longitudinal direction and the sum of the longitudinal lengths from both ends of the top sheet in the longitudinal direction to the nearest row is 10% or more and 90% or less of the longitudinal length of the top sheet.

[0012] A fifth aspect of the present invention is the absorbent article of the first aspect or the second aspect, wherein the height of the convex portions of the top sheet is 0.1 mm or more and 10 mm or less. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide an absorbent article that is both thin and has good water absorption performance and is resistant to slippage. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a plan view of an absorbent article according to one embodiment of the present invention, viewed from the skin side. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. [Figure 3] 1A and 1B are plan views of absorbent bodies, in which (a) shows the upper absorbent body as viewed from the skin side, and (b) shows the lower absorbent body as viewed from the non-skin side. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an absorbent article according to one embodiment of the present invention will be described with reference to the drawings.

[0016] In this specification, "wearing an absorbent article" refers to the state in which the absorbent article is worn on the body, regardless of whether the absorbent article is worn before, during, or after absorbing bodily fluids. Furthermore, "front side" refers to the direction that faces the wearer's ventral side when the absorbent article is worn, and "rear side" refers to the direction that faces the wearer's back. Furthermore, "left-right direction" refers to the left-right direction as seen from a wearer facing forward. Furthermore, "longitudinal direction" refers to the longitudinal direction of the absorbent article, a direction that runs along the front and back of the wearer when worn, and is the direction indicated by arrow X in the drawings. Furthermore, the "inner side in the longitudinal direction" refers to the direction toward the center in the longitudinal direction, and the "outer side in the longitudinal direction" refers to the direction away from the center in the longitudinal direction. Furthermore, the "width direction" refers to the direction intersecting (orthogonal to) the longitudinal direction, a direction that runs along the left and right sides of the wearer when worn, and is the direction indicated by arrow Y in the drawings. Furthermore, the "inner side in the width direction" refers to the direction toward the center in the width direction, and the "outer side in the width direction" refers to the direction away from the center in the width direction. Furthermore, "thickness direction" refers to the direction in which each component is layered, and is the direction intersecting (orthogonal to) both the longitudinal direction and the width direction, and is the direction along arrow Z in the figure. Furthermore, "skin side" refers to the direction in the thickness direction that faces the body of the wearer when the absorbent article is worn, and "non-skin side" refers to the direction in the thickness direction opposite to the skin side. Furthermore, body fluids refer to liquids excreted from the body to the outside, such as urine, blood, and water in loose stools.

[0017] (Absorbent articles) Fig. 1 is a plan view of an absorbent article according to one embodiment of the present invention, as seen from the skin side. Fig. 2 is a cross-sectional view taken along the line II-II in Fig. 1. Fig. 3 is a plan view of an absorbent body, in which (a) shows the upper absorbent body as seen from the skin side, and (b) shows the lower absorbent body as seen from the non-skin side. Fig. 2 shows a schematic cross section of the absorbent article.

[0018] The absorbent article 10 according to this embodiment can be used as various absorbent articles for both adults and children, representative examples of which include light incontinence pads, urine absorption pads, pants-type disposable diapers, tape-fastened disposable diapers, sanitary products, etc. Various types of disposable diapers may be used as outerwear in combination with the absorbent article 10 as innerwear.

[0019] 1 and 2, the absorbent article 10 comprises a liquid-permeable top sheet 11 on the skin side, a liquid-impermeable back sheet 12 on the non-skin side, and an absorbent body 13 disposed between the top sheet 11 and the back sheet 12. In addition to these, the absorbent article 10 may comprise three-dimensional gathers extending in the longitudinal direction (X direction) on both sides of the skin-side surface of the top sheet 11 in the width direction (Y direction).

[0020] (Top sheet) The top sheet 11 is a liquid-permeable sheet-like substrate that allows bodily fluids to pass quickly toward the absorbent body 13 and diffuse the bodily fluids in the plane direction of the absorbent body 13. The top sheet 11 is a sheet that is positioned on the skin side when worn and is arranged opposite the back sheet 12 with the absorbent body 13 in between. The top sheet 11 is preferably a substrate that is soft to the touch and does not irritate the skin so that it may come into direct 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, apertured films such as apertured polyethylene films, and foamed films such as polyethylene foam and urethane foam. Examples of hydrophilic sheets include air-through nonwoven fabrics, thermal-bonded nonwoven fabrics, spunlace nonwoven fabrics, and spunbonded nonwoven fabrics made from one or more of synthetic fibers made from synthetic resins such as polypropylene, polyethylene, and polyester, regenerated fibers such as rayon, and natural fibers such as cotton.

[0021] In order to reduce irritation to the skin, the top sheet 11 may contain lotion, antioxidant, anti-inflammatory component, pH adjuster, antibacterial agent, moisturizer, etc. The shape of the top sheet 11 is not particularly limited, and it may be of any shape as long as it has a size required to guide bodily fluids to the absorbent body 13 without leakage and covers part or all of the absorbent body 13.

[0022] (Convex part) As shown in Figures 1 and 2, the top sheet 11 has a plurality of protrusions 14 formed thereon that protrude toward the skin side. The plurality of protrusions 14 can be formed, for example, by embossing. Any known method can be used for embossing, without limitation. The plurality of protrusions 14 are provided primarily to prevent the absorbent article 10 from shifting in the front-to-back direction during use, but also contribute to improving liquid permeability to the absorbent body 13.

[0023] Each of the multiple protrusions 14 has a widthwise length A (the length of the protrusion 14 along the width direction of the absorbent article 10) that is longer than a longitudinal length B (the length of the protrusion 14 along the longitudinal direction). The shape of the protrusions 14 is not particularly limited, but may be a horizontally elongated shape that is longer in the width direction than in the longitudinal direction, such as a horizontally elongated rectangle, rhombus, ellipse, trapezoid, or combinations thereof. Note that the widthwise length A and longitudinal length B of the protrusion 14 refer to the maximum length in the width direction or longitudinal direction for each shape. Furthermore, while FIG. 1 illustrates the multiple protrusions 14 as having the same shape and size, this is not limiting and the protrusions 14 may have different shapes and sizes.

[0024] The length B of the protrusions 14 in the longitudinal direction is preferably 70% or less of the length A of the protrusions 14 in the width direction (when the length A is 100%, the same applies below). If the length B of the protrusions 14 in the longitudinal direction is longer than 70% of the length A of the protrusions 14 in the width direction, the protrusions 14 will be less likely to deform when a force is applied in the front-to-rear direction, which will make them more likely to slip between the protrusions 14 and the skin (contact area), reducing the anti-slip effect. Furthermore, the length B of the protrusions 14 in the longitudinal direction is preferably 1% or more of the length A of the protrusions 14 in the width direction. If the length B of the protrusions 14 in the longitudinal direction is shorter than 1% of the length A of the protrusions 14 in the width direction, the strength of the protrusions 14 will be insufficient, causing the protrusions 14 to be crushed when worn, reducing the anti-slip effect.

[0025] In this embodiment, the multiple protrusions 14 are arranged in areas defined in a grid pattern. Specifically, the multiple protrusions 14 form multiple rows r extending in the width direction. The multiple rows r of protrusions 14 are arranged spaced apart from one another in the longitudinal direction. The row r of protrusions 14 may be formed by multiple protrusions 14 lined up in the width direction while being spaced apart from one another in the width direction, or may be formed by a single protrusion 14 extending in the width direction. FIG. 1 illustrates a state in which seven rows r, each consisting of three protrusions 14 lined up in the width direction, are arranged spaced apart from one another in the longitudinal direction. Note that the number of protrusions 14 provided is not limited to this. Furthermore, in this embodiment, the multiple protrusions 14 are arranged in areas defined in a grid pattern, but this is not limited thereto and they may be arranged in any position.

[0026] When the multiple protrusions 14 are configured in multiple rows r extending in the width direction as described above, the total width direction length of the protrusions 14 in the row r (the sum of the width direction lengths A of the protrusions 14 in the row r) is preferably 30% to 100% of the width direction length C of the top sheet 11. If the total width direction length of the protrusions 14 in the row r is shorter than 30% of the width direction length C of the top sheet 11, the proportion of contact between the protrusions 12 and the skin relative to the size of the absorbent article 10 will be small, and the slippage suppression effect will be insufficient. Note that when the row r is configured with multiple protrusions 14, the total width direction length of the protrusions 14 in the row r is the sum of the width direction lengths A of the protrusions 14 in the row r (in this embodiment, total length = A + A + A), and when the row r is configured with a single protrusion 14, it is the width direction length A of that protrusion 14.

[0027] Furthermore, when the multiple protrusions 14 are configured in multiple rows r extending in the width direction as described above, the distance D between adjacent rows r in the longitudinal direction and the sum of the longitudinal lengths E from both longitudinal ends of the top sheet 11 to the nearest row r are preferably 10% to 90% of the longitudinal length F of the top sheet 11. If the distance D between the rows r and the sum of the lengths E on both sides of the longitudinal direction of the top sheet 11 are made shorter than 10% of the longitudinal length F of the top sheet 11, the proportion of contact between the protrusions 12 and the skin relative to the size of the absorbent article 10 will be reduced, resulting in an insufficient slippage prevention effect. On the other hand, if the distance D between the rows r and the sum of the lengths E on both sides of the longitudinal direction of the top sheet 11 are made longer than 90% of the longitudinal length F of the top sheet 11, there will be less space for the protrusions 14 to deform when a force is applied in the front-to-rear direction, which will make them more likely to slip against the skin and reduce the slippage prevention effect.

[0028] The height G of the protrusions 14 is preferably 0.1 mm or more and 10 mm or less. If the height E of the protrusions 14 is smaller than 0.1 mm, the friction between the protrusions 14 and the skin will be small, resulting in an insufficient slippage prevention effect. On the other hand, if the height E of the protrusions 14 is larger than 10 mm, the feel on the skin when worn will be poor.

[0029] (back seat) The backsheet 12 is a sheet positioned away from the skin when worn. The backsheet 12 may be formed using a liquid-impermeable substrate that prevents body fluids held by the absorbent body 13 from wetting the wearer's clothing. Examples of such substrates include resin films and composite sheets that are laminates of resin films and nonwoven fabrics. The nonwoven fabrics used in the composite sheets may be produced by any method, and examples include single-layer nonwoven fabrics such as spunbonded nonwoven fabrics and meltblown nonwoven fabrics, composite nonwoven fabrics such as spunbonded nonwoven fabric / meltblown nonwoven fabric laminates and spunbonded nonwoven fabric / meltblown nonwoven fabric / spunbonded nonwoven fabric laminates, and composite materials thereof. Examples of resin films include polyester, polyvinyl alcohol, polyethylene, polypropylene, and composite films of polyethylene and polypropylene.

[0030] It is preferable that the back sheet 12 be breathable to prevent stuffiness during wear. To provide breathability to the back sheet 12, for example, a filler may be blended into the resin film substrate or the back sheet 12 may be embossed. An example of the filler is calcium carbonate, and the blending method may be any known method without limitation.

[0031] (absorbent) 2 and 3, the absorbent body 13 includes an upper absorbent body 15 positioned relatively closer to the skin, a lower absorbent body 16 positioned relatively farther from the skin, a liquid-permeable first intermediate sheet 17 enveloping both the upper absorbent body 15 and the lower absorbent body 16, and a liquid-permeable second intermediate sheet 18 disposed between the upper absorbent body 15 and the lower absorbent body 16. The upper absorbent body 15 and the lower absorbent body 16 are layered and overlap each other with the second intermediate sheet 18 interposed therebetween. In the present disclosure, the layer positioned closer to the skin is referred to as the upper layer, and the layer positioned farther from the skin is referred to as the lower layer. In addition, in this embodiment, the upper absorbent body 15 and the lower absorbent body 16 are approximately the same size, but this is not limiting, and one of the upper absorbent body 15 and the lower absorbent body 16 may be larger than the other.

[0032] (Upper absorber) As shown in Fig. 2 and Fig. 3(a), the upper absorbent body 15 has a basis weight of 50 g / m 2 More than 130g / m 2 It is composed of the following pulp fibers and superabsorbent polymer (hereinafter referred to as "SAP").

[0033] The pulp fibers used in the upper absorbent body 15 are not particularly limited as long as they are generally used in absorbent articles such as sanitary napkins, disposable diapers, light incontinence liners, and urine absorption pads, and examples thereof include wood pulp (e.g., bleached coniferous kraft pulp (N-BKP) such as southern pine or Douglas fir), synthetic fibers, resin fibers, non-wood pulp, etc., which have been defibrated into a cotton-like state.

[0034] The SAP used in the upper-layer absorbent body 15 and the lower-layer absorbent body 16 described below 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 saponified products thereof. Among these, from the viewpoint of absorption per weight, polyacrylates are preferred, alkali metal polyacrylates are more preferred, and sodium polyacrylate is even more preferred. SAPs can be used alone or in combination of two or more.

[0035] The upper absorbent body 15 contains pulp fiber in an amount of 40% by weight to 100% by weight and SAP in an amount of 0% by weight to 60% by weight. That is, the upper absorbent body 15 contains pulp fiber in an amount of 40% by weight to 100% by weight and SAP in an amount of 0% by weight to 60% by weight. When SAP is contained in the upper absorbent body 15, the pulp fiber and SAP are preferably formed by mixing SAP particles in the pulp fiber.

[0036] The upper absorbent body 15 is provided with a slit 19 extending in the longitudinal direction. The slit 19 is an area where pulp fibers and SAP are not arranged, and extends in the longitudinal direction while penetrating the upper absorbent body 15 in the thickness direction (Z direction). In this embodiment, the slit 19 extending linearly in the longitudinal direction (X direction) is provided in the center of the upper absorbent body 15 in the width direction. In this embodiment, the longitudinal length of the slit 19 is shorter than the longitudinal length of the upper absorbent body 15, and both longitudinal ends of the slit 19 do not reach both longitudinal ends of the upper absorbent body 15. The longitudinal length of the slit 19 is not limited to the above, and may be long enough to reach both longitudinal ends of the upper absorbent body 15.

[0037] (Lower absorber) As shown in FIGS. 2 and 3(b), the lower absorbent body 16 does not contain pulp fibers and is made of SAP. The lower absorbent body 16 is provided with a slit 20 extending in the longitudinal direction. The slit 20 is an area where SAP is not disposed, and extends longitudinally while penetrating the lower absorbent body 16 in the thickness direction (Z direction). In this embodiment, the slit 20 extends linearly in the longitudinal direction (X direction) in the center of the width of the lower absorbent body 16. That is, in this embodiment, the slits 19, 20 of both the upper absorbent body 15 and the lower absorbent body 16 are positioned so as to overlap each other vertically. In this embodiment, the longitudinal length of the slit 20 is shorter than the longitudinal length of the lower absorbent body 16, and both longitudinal ends of the slit 20 do not reach both longitudinal ends of the lower absorbent body 16. The longitudinal length of the slit 20 is not limited to the above and may be long enough to reach both longitudinal ends of the lower absorbent body 16.

[0038] (Method for forming lower absorbent body) An example of a method for forming the lower absorbent body 16 will be described below. Note that the method for forming the lower absorbent body 16 is not limited to the following method, and any other method that does not contain pulp fibers and can arrange SAP at the position of the lower absorbent body 16 may be used.

[0039] As shown in FIG. 3(b), the lower absorbent body 16 may be formed by adhering the SAPs constituting the lower absorbent body 16 to at least one of the first intermediate sheet 17 (see FIG. 2) and the second intermediate sheet 18. In this case, the lower absorbent body 16 may be formed by applying adhesive to a predetermined region (the region where the lower absorbent body 16 will be located) of at least one of the first intermediate sheet 17 and the second intermediate sheet 18, and adhering the SAPs to the adhesive-applied region. From the viewpoint of shape retention, the SAPs constituting the lower absorbent body 16 are preferably adhered to both the first intermediate sheet 17 and the second intermediate sheet 18. Furthermore, when adhering the SAPs constituting the lower absorbent body 16 to either the first intermediate sheet 17 or the second intermediate sheet 18, it is preferable that they be adhered to the second intermediate sheet 18 from the viewpoint of preventing misalignment and separation of the lower absorbent body 16 relative to the upper absorbent body 15.

[0040] Alternatively, when forming the lower-layer absorbent body 16, a base nonwoven fabric (not shown) may be provided, adhesive may be applied to the predetermined region on the base nonwoven fabric, and SAP may be adhered to the adhesive-applied region to form the lower-layer absorbent body 16. Alternatively, the lower-layer absorbent body 16 may be formed by adhering two base nonwoven fabrics (not shown) together with SAP disposed between them in the predetermined region.

[0041] An example of an adhesive for bonding SAP is a hot melt adhesive. Examples of hot melt adhesives include hot melt adhesives such as styrene-butadiene-styrene copolymers, synthetic rubber hot melt adhesives such as styrene-isoprene-styrene copolymers, and olefin hot melt adhesives such as ethylene-vinyl acetate copolymers. Hot melt adhesives can be applied by known methods, such as the curtain coating method or spiral method, in which a molten hot melt adhesive is applied from a nozzle in a non-contact manner, or the slot method, in which a contact application is performed.

[0042] (First intermediate sheet) The first intermediate sheet 17 is a liquid-permeable sheet located between the top sheet 11 and the back sheet 12, and encases both the upper-layer absorbent body 15 and the lower-layer absorbent body 16 together. The base material of the first intermediate sheet 17 may be any material that has a faster body fluid permeation rate than the top sheet 11 and that quickly diffuses body fluid toward the upper-layer absorbent body 15 and the lower-layer absorbent body 16. Examples of the base material include tissue, absorbent paper, and hydrophilic nonwoven fabrics such as airlaid nonwoven fabrics and spunbond nonwoven fabrics. Although the first intermediate sheet 17 is shown in FIG. 2 as being cylindrical, it is not limited to a cylindrical shape. Both widthwise ends of the first intermediate sheet 17 may overlap each other on the skin side (top sheet 11 side) of the upper-layer absorbent body 15, or on the non-skin side (back sheet 12 side) of the lower-layer absorbent body 16.

[0043] (Second intermediate sheet) The second intermediate sheet 18 is a liquid-permeable sheet that is disposed between the upper absorbent body 15 and the lower absorbent body 16. The substrate of the second intermediate sheet 18 may be any hydrophilic material, such as tissue, absorbent paper, air-laid nonwoven fabric, or spunbond nonwoven fabric. The substrate of the second intermediate sheet 18 may be the same as or different from the substrate of the first intermediate sheet 17.

[0044] (3D gathers) To prevent side leakage of bodily fluids excreted by the wearer, left and right three-dimensional gathers may be provided on both the left and right sides of the skin-facing side of the absorbent article 10. The three-dimensional gathers are provided on both widthwise ends of the skin-facing side of the top sheet 11, extending along the longitudinal direction. The three-dimensional gathers include a water-repellent and / or waterproof gathered sheet, and an elastic, stretchable member such as rubber thread that is provided on the free end side (inner end side in the widthwise direction) of the gathered sheet to provide it with standing ability.

[0045] In the absorbent article 10 configured as described above, the basis weight of the pulp fiber of the upper absorbent body 15 is 130 g / m 2Since the lower absorbent body 16 does not contain pulp fibers, the thickness of the absorbent body 13 can be reduced, and the thickness of the absorbent article 10 as a whole can also be reduced.

[0046] Furthermore, the upper absorbent body 15 contains 40% by weight or more of pulp fiber and has slits 19, so that a high water absorption rate can be ensured.

[0047] Furthermore, the absorbent body 13 has a two-layer structure consisting of an upper absorbent body 15 and a lower absorbent body 16, and both the upper absorbent body 15 and the lower absorbent body 16 contain SAP, so that body fluids can be absorbed by the SAP of both the upper absorbent body 15 and the lower absorbent body 16, thereby preventing body fluids from flowing back.

[0048] In addition, the top sheet 11 is formed with a plurality of horizontally elongated convex portions 14 in the width direction, so that when the absorbent article 10 is worn and used, the plurality of horizontally elongated convex portions 14 in the width direction can prevent the absorbent article 10 from shifting forward and backward relative to the body.

[0049] As described above, according to this embodiment, it is possible to provide an absorbent article 10 that is both thin and has good water absorption performance, and that is resistant to slippage.

[0050] In addition, the absorbent body 13 has a liquid-permeable first intermediate sheet 17 that wraps around the upper absorbent body 15 and the lower absorbent body 16, which allows body fluids to be quickly diffused into the upper absorbent body 15 and the lower absorbent body 16, and also stabilizes the shape of the two-layer absorbent body 13.

[0051] In addition, the absorbent body 13 has a liquid-permeable second intermediate sheet 18 between the upper absorbent body 15 and the lower absorbent body 16, so that bodily fluids that are not fully absorbed by the upper absorbent body 15 can be quickly diffused into the lower absorbent body 16.

[0052] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the content of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Example]

[0053] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0054] (Examples 1 to 5 and Comparative Examples 1 to 8) Absorbent articles (pad-type absorbent articles) of Examples 1 to 5 and Comparative Examples 1 to 8 were produced under the conditions shown in Table 1. The top sheets of the absorbent articles of Examples 1 to 5 and Comparative Examples 1 to 7 had seven rows of protrusions elongated in the width direction, each row consisting of three rows in the width direction, spaced apart from each other in the longitudinal direction, as shown in Figure 1 of the above embodiment. The spacing between the multiple protrusions was uniform in both the width direction and the longitudinal direction. The size of the protrusions was 30 mm in the width direction and 10 mm in the longitudinal direction. Then, the following four items ("thickness," "absorption time (absorption speed)," "wet-back amount," and "resistance to slippage") were measured or evaluated for each absorbent article.

[0055] (Thickness) Regarding "thickness," the thickness of each absorbent article is measured at the center in the longitudinal direction and the center in the width direction. The thickness of the absorbent article can be measured, for example, by the following method.

[0056] The thickness of the absorbent article was measured using a thickness gauge (trade name: dial thickness gauge "PEACOCK (registered trademark)" manufactured by Ozaki Seisakusho Co., Ltd.) at 35 gf / cm 2 The measurements were carried out under the following loading conditions.

[0057] (Water absorption time (water absorption rate)) "Water absorption time (water absorption rate)" is the water absorption time measured after injecting saline into each absorbent article. When measuring water absorption time, 40 mL of saline is injected through the top sheet into the center of the absorbent article in the longitudinal and transverse directions, and after leaving it for 3 minutes, another 40 mL of saline is injected. Then, after the second injection of saline, the time until all of the injected saline is absorbed by the absorbent article is measured.

[0058] (amount of liquid returning) The "amount of liquid return" is the amount of liquid return from each absorbent article measured after injecting saline into the absorbent article. When measuring the amount of liquid return, first, 450 mL of saline is injected through the top sheet into the center of the absorbent article in the longitudinal and width directions, and the absorbent article is left to stand for 10 minutes. Next, a filter paper (NO. 2 manufactured by ADVANTEC, diameter 55 mm) whose weight before the test has been measured is placed in the center of the injected part of the top sheet of the absorbent article after being left to stand for 10 minutes, and a 35 g / cm2 solution is applied to the filter paper. 2 After one minute has passed since the weight was placed on the filter paper, the filter paper is removed and weighed after the test, and the difference in weight (g) of the filter paper before and after the test is calculated, and this calculated value is the amount of liquid returning.

[0059] (Difficult to slip) The evaluation of "non-slip" was a sensory evaluation by 20 monitors regarding slippage of the absorbent article when worn. For the evaluation of "non-slip", 20 monitors were asked to wear each absorbent article and select either "non-slip" or "easy to slip". The evaluation was then carried out according to the following criteria. 〇: 14 to 20 people answered "hard to slip" △: 7 to 13 people answered "hard to slip" ×: 0 to 6 people answered "difficult to shift"

[0060] The results obtained are shown in Table 1.

[0061] [Table 1]

[0062] As shown in Table 1, it was confirmed that the thickness of the absorbent article could not be reduced in Comparative Example 1, the amount of liquid return could not be reduced in Comparative Examples 2 and 5, the water absorption time could not be reduced in Comparative Examples 3, 4, 6, and 7, and that Comparative Example 8 was prone to slippage.

[0063] Thus, it has been confirmed that the present disclosure can provide an absorbent article that is both thin and has good water absorption performance, and is resistant to slippage. [Explanation of symbols]

[0064] 10: Absorbent articles 11: Top sheet 12: Back seat 13: Absorbent 14: Convex part 15: Upper absorber 16: Lower absorber 17: First intermediate sheet 18: Second intermediate sheet 19,20:Slit

Claims

1. An absorbent article comprising a liquid-permeable top sheet on the skin side, a liquid-impermeable back sheet on the non-skin side, and an absorbent body disposed between the top sheet and the back sheet, The absorbent body has an upper absorbent body on the skin side, a lower absorbent body on the non-skin side, a liquid-permeable first intermediate sheet that encases both the upper absorbent body and the lower absorbent body, and a liquid-permeable second intermediate sheet that is disposed between the upper absorbent body and the lower absorbent body, The upper absorbent body has a basis weight of 50 g / m ２ 130g / m or more ２ The present invention comprises 40% by weight or more and 100% by weight or less of the following pulp fibers and 0% by weight or more and 60% by weight or less of a superabsorbent polymer, The lower absorbent body does not contain pulp fibers and is made of a highly absorbent polymer, The upper absorbent body and the lower absorbent body are provided with slits extending in the longitudinal direction of the absorbent article, The top sheet is formed with a plurality of protrusions that protrude toward the skin side, The length of the protrusions along the width direction of the absorbent article is longer than the length of the protrusions along the longitudinal direction. An absorbent article characterized by:

2. The length of the projections of the top sheet in the longitudinal direction is 70% or less of the length of the projections in the width direction.

2. The absorbent article according to claim 1.

3. The plurality of protrusions of the top sheet form a plurality of rows extending in the width direction, The rows are spaced apart from one another in the longitudinal direction, the row of protrusions is composed of a plurality of protrusions spaced apart from each other in the width direction, or a single protrusion extending in the width direction, The total length of the convex portions in the row in the width direction is 30% or more and 100% or less of the length of the top sheet in the width direction.

3. The absorbent article according to claim 1 or claim 2.

4. The sum of the distance between adjacent rows in the longitudinal direction and the length in the longitudinal direction from both ends of the top sheet in the longitudinal direction to the nearest row is 10% or more and 90% or less of the length in the longitudinal direction of the top sheet.

4. The absorbent article according to claim 3.

5. The height of the convex portions of the top sheet is 0.1 mm or more and 10 mm or less.

3. The absorbent article according to claim 1 or claim 2.

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