Absorbent articles

Abstract

To provide an absorbent article that suitably prevents leakage from the side.SOLUTION: An absorbent article 1 satisfies all features (i) to (iii) below in an opened and maximally stretched state in plan view. (i) A crotch part M has "a portion in which, when an imaginary straight line is drawn crossing the absorbent article 1 in a lateral direction X, a length of a portion of the imaginary straight line overlapping a separation part 85 between a pair of leakproof cuffs 8, 8 is greater than a length of a portion of the imaginary straight line overlapping a first core 6" (corresponding to the portion, in one embodiment of the present invention, at a same position with respect to the vertical direction X as a reduced width part 62 of the first core 6). (ii) Overlap parts where there is an overlap between an upright part 82 of the leakproof cuffs 8 and a second core 7 are present in the crotch part M. (iii) The leakproof cuffs 8 and the first core 6 overlap at a position, in a stomach-side region Fr and / or a back-side region Rr, outward, with respect to the vertical direction X, of the overlap parts of the aforementioned feature (ii).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an absorbent article with leak-proof cuffs. [Background technology]

[0002] Background Art Known absorbent articles, such as disposable diapers, include an absorbent body having a vertical direction corresponding to the front-to-back direction of a wearer and a horizontal direction perpendicular to the vertical direction, which absorbs and retains bodily fluids, and a pair of leak-proof cuffs arranged along both sides of the absorbent body in the vertical direction and which stand up toward the wearer's skin when worn. Patent Document 1 describes the above-mentioned known disposable diaper having a high basis weight part in the lateral center of the crotch part corresponding to the wearer's crotch part, and low basis weight parts having a lower basis weight than the high basis weight part on both lateral sides of the high basis weight part. In the diaper described in Patent Document 1, the absorbent body has a laminated structure of an upper absorbent layer and a lower absorbent layer arranged farther from the wearer's skin than the upper absorbent layer and having larger longitudinal and lateral dimensions than the upper absorbent layer, and the laminated structure forms the high basis weight part, and the part on which the upper absorbent layer is not laminated forms the low basis weight part. Both the upper absorbent layer and the lower absorbent layer are made of a fiber assembly or a fiber assembly holding a functional material such as water-absorbing polymer particles. Figure 2 of Patent Document 1 shows the skin-facing side of the diaper in an unfolded and stretched state. According to this Figure 2, in the crotch area, the lateral distance between one and the other of a pair of leakage-proof cuffs is longer than the lateral length of the upper absorbent layer, but Patent Document 1 does not provide any specific explanation on this point. Patent Document 2 describes a disposable diaper having an absorbent body with a two-layer structure similar to the diaper described in Patent Document 1, in which one layer of the two-layer structure is configured by disposing a water-absorbent polymer between a substrate layer made of nonwoven fabric and a thermoplastic material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-16435 A [Patent Document 2] Special Publication No. 2006-513824 Summary of the Invention [Problem to be solved by the invention]

[0004] In absorbent articles equipped with leak-proof cuffs, the leak-proof cuffs stand up when the article is worn, preventing so-called side leakage, in which waste material such as urine excreted by the wearer leaks outward in the lateral direction of the diaper. However, for example, when the wearer of the diaper sits down, the leak-proof cuffs, which should be in an upright position, may become collapsed due to body pressure, causing waste material to overflow the collapsed leak-proof cuffs and leak outward in the lateral direction of the diaper. No technology has yet been provided that can prevent side leakage even when the leak-proof cuffs are in a collapsed position.

[0005] Therefore, an object of the present invention is to provide an absorbent article that has excellent side leakage prevention performance. [Means for solving the problem]

[0006] The present invention provides an absorbent article having a ventral side portion that is arranged on the ventral side of a wearer when worn, a dorsal side portion that is arranged on the dorsal side of the wearer, and a crotch portion located therebetween, and having a vertical direction extending from the ventral side portion through the crotch portion to the dorsal side portion and a horizontal direction perpendicular to the vertical direction, the article comprising an absorbent body that absorbs and retains bodily fluids, and a pair of leakproof cuffs that are arranged from the ventral side portion to the dorsal side portion along both side portions along the vertical direction of the absorbent body. In one embodiment of the absorbent article of the present invention, the absorbent body has a laminated structure of a first core and a second core arranged farther from the wearer's skin than the first core, and the second core has a configuration in which an absorbent polymer is interposed between base sheets arranged opposite each other in the thickness direction of the absorbent body. In one embodiment of the absorbent article of the present invention, each of the pair of leakproof cuffs has an upstanding portion in at least the crotch area that stands up toward the wearer's skin when worn, and when viewed in a plan view of the skin-facing surface of the absorbent article in an unfolded and maximum stretched state, one of the leakproof cuffs is separated from the other of the leakproof cuffs by a separation portion. In one embodiment of the absorbent article of the present invention, all of the following (i) to (iii) are satisfied in a plan view of the absorbent article in an unfolded and maximally stretched state. (i) When a single imaginary straight line is drawn in the crotch portion that crosses the absorbent article in the horizontal direction, the length of the portion of the imaginary line that overlaps with the separation portion is longer than the length of the portion of the imaginary line that overlaps with the first core. (ii) An overlapping portion between the standing portion and the second core is present in the crotch portion. (iii) When the absorbent article in its unfolded and maximum stretched state is divided into two equal parts in the vertical direction and a virtual line extending in the horizontal direction is used as a reference, the region of the absorbent article closer to the ventral side portion is defined as the ventral region, and the region of the absorbent article closer to the dorsal side portion is defined as the dorsal region, the leakproof cuff and the first core overlap at a position in the vertical direction outer than the overlapping portion of (ii) in at least one of the ventral region and the dorsal region. Other features, advantages and embodiments of the present invention are described below. Effect of the Invention

[0007] The absorbent article of the present invention has excellent side leakage prevention performance, and side leakage is unlikely to occur even when the wearer is in a sitting position. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a natural state of a pants-type disposable diaper, which is one embodiment of the absorbent article of the present invention. In this specification, the term "natural state" refers to a state in which the absorbent article is not stretched (relaxed state) without applying an external force to each elastic member arranged in the absorbent article. [Diagram 2]FIG. 2 is a developed plan view showing a schematic view of the skin-facing side (top sheet side) of the diaper shown in FIG. 1 in a developed and maximum stretched state. [Diagram 3] FIG. 3 is a cross-sectional view showing a schematic cross section of the diaper shown in FIG. 2 taken along line II (a cross section along the thickness direction and the lateral direction). [Figure 4] FIG. 4 is a cross-sectional view showing a schematic cross section of the diaper shown in FIG. 2 taken along line II-II (a cross section along the thickness direction and the lateral direction). [Diagram 5] FIG. 5 is a cross-sectional view illustrating the natural state of the diaper illustrated in FIG. [Figure 6] FIG. 6 is a cross-sectional view illustrating the natural state of the diaper illustrated in FIG. [Figure 7] FIG. 7 is a view corresponding to FIG. 2, showing a pants-type disposable diaper which is another embodiment of the absorbent article of the present invention. [Figure 8] FIG. 8 is a view corresponding to FIG. 2, showing a pants-type disposable diaper which is still another embodiment of the absorbent article of the present invention. [Figure 9] FIG. 9 is a view corresponding to FIG. 3, showing a pants-type disposable diaper which is still another embodiment of the absorbent article of the present invention. [Figure 10] FIG. 10 is a cross-sectional view illustrating the natural state of the diaper illustrated in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described below based on preferred embodiments with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

[0010] 1 to 6 show a pants-type disposable diaper 1, which is one embodiment of the absorbent article of the present invention. The diaper 1 has a ventral portion F that is arranged on the ventral side of a wearer when worn, a ventral portion R that is arranged on the ventral side of the wearer, and a crotch portion M located between the ventral portion F and the ventral portion R, and also has a longitudinal direction X that extends from the ventral portion F through the crotch portion M to the ventral portion R, corresponding to the front-to-rear direction of the wearer, and a lateral direction Y that is perpendicular to the longitudinal direction X. The diaper 1 also includes an absorbent body 5 that absorbs and retains bodily fluids, and a pair of leak-proof cuffs 8, 8 that are arranged from the ventral portion F to the ventral portion R along both sides of the absorbent body 5 along the longitudinal direction X.

[0011] The crotch portion M extends in the longitudinal direction X across the longitudinal centerline CLx of the diaper 1. The longitudinal centerline CLx is an imaginary straight line extending in the transverse direction Y, dividing the diaper 1 in the fully stretched and unfolded state as shown in FIG. The crotch portion M includes an excretory part facing portion (not shown) that faces the wearer's excretory part such as the penis, and typically includes a portion of the diaper 1 whose length (width) in the lateral direction Y is the shortest. In the present invention, the abdominal portion F, the crotch portion M and the back portion R may be each of the regions obtained by dividing the absorbent article in an unfolded and maximally stretched state into three equal parts in the longitudinal direction X.

[0012] In this specification, the term "unfolded and maximally stretched state" refers to a state in which the absorbent article is spread out flat to an unfolded state, and the elastic members of each part of the absorbent article in the unfolded state are stretched to their maximum extent until the absorbent article is expanded to the same dimensions as the design dimensions, i.e., the dimensions when the absorbent article is unfolded flat in a state in which the influence of the elastic members is completely eliminated. In the case of an absorbent article having side seals, the absorbent article is cut at the side seals and spread out flat to the unfolded state.

[0013] In this embodiment, the diaper 1 is formed symmetrically on one side and the other side with respect to a lateral centerline CLy in the unfolded and maximally stretched state as shown in Fig. 2. The lateral centerline CLy is an imaginary straight line extending in the longitudinal direction X and dividing the diaper 1 in the unfolded and maximally stretched state into two equal parts in the lateral direction Y. The diaper 1 comprises an absorbent body 2 including an absorbent substratum 5, and an exterior body 10 disposed on the non-skin-facing side of the absorbent body 2. The absorbent body 2 and the exterior body 10 are joined together by a known joining means such as an adhesive. The exterior body 10 is a member that forms the outer shape of the diaper 1. The peripheral edges of the exterior body 10 form the contour lines of the ventral portion F and the dorsal portion R of the diaper 1. The exterior body 10 includes a ventral-side exterior body 10F that extends in the lateral direction Y and is located in the ventral portion F, and a dorsal-side exterior body 10R that is separate from the ventral-side exterior body 10F and that extends in the lateral direction Y and is located in the dorsal portion R. In other words, the diaper 1 is a so-called split-type pants-type disposable diaper in which the exterior body is divided into a member disposed on the ventral side and a member disposed on the dorsal side. The absorbent body 2 has a rectangular shape in a plan view, and is positioned in the center of the exterior body 10 in the horizontal direction Y with its longitudinal direction aligned with the vertical direction X of the diaper 1. It extends in the vertical direction X from the ventral portion F to the dorsal portion R, and is bridged between the ventral exterior body 10F and the dorsal exterior body 10R, which are arranged at a predetermined distance in the vertical direction X.

[0014] In this specification, the "skin-facing side" refers to the side of the absorbent article or its constituent member (e.g., absorbent body) that faces the wearer's skin when the absorbent article is worn, i.e., the side relatively close to the wearer's skin, and the "non-skin-facing side" refers to the side of the absorbent article or its constituent member that faces the opposite side to the skin when the absorbent article is worn, i.e., the side relatively far from the wearer's skin. Note that "when worn" here refers to the normal, appropriate wearing position, i.e., a state in which the absorbent article is maintained in the correct wearing position.

[0015] As shown in Fig. 1, the diaper 1 has a pair of side seal portions S, S formed by joining both side portions of the ventral exterior body 10F along the longitudinal direction X to both side portions of the rear exterior body 10R along the longitudinal direction X. This allows the exterior bodies 10F, 10R to be connected in a ring shape. The side seal portions S are formed by known joining means such as adhesives, heat sealing, ultrasonic sealing, etc. The diaper 1 also has a waist opening WH through which the wearer's torso passes, and a pair of leg openings LH, LH through which the wearer's lower legs pass.

[0016] The absorbent body 2 is configured to include a liquid-permeable top sheet 3 arranged relatively close to the wearer's skin, a liquid-impermeable or poorly liquid-permeable or water-repellent back sheet 4 arranged relatively far from the wearer's skin, and an absorbent body 5 interposed between the two sheets 3, 4. These members constituting the absorbent body 2 are integrated with each other by a known joining means such as an adhesive. As the top sheet 3 and the back sheet 4, any sheet that is normally used in this type of absorbent article can be used without any particular limitation. As the top sheet 3, various sheets having liquid permeability can be used, for example, nonwoven fabric, woven fabric, and paper. As the back sheet 4, a sheet having leakproof properties, specifically a sheet having liquid impermeability (a property that does not allow liquid to pass through at all) or poorly liquid permeability (a property that is not liquid impermeable but does not allow liquid to pass through easily), for example, a moisture-permeable resin film or a laminate of the resin film and a nonwoven fabric can be used.

[0017] In this embodiment, the absorbent body 5 has a shape that is elongated in one direction, such as a rectangular shape, in a plan view as shown in Fig. 2, and is arranged so that its longitudinal direction coincides with the longitudinal direction X of the diaper 1. The absorbent body 5 is arranged in the crotch portion M. In the diaper 1, the absorbent body 5 is continuous from the abdominal portion F through the crotch portion M to the dorsal portion R. 3 and 4, the topsheet 3 traverses the skin-facing surface of the absorbent body 5 in the horizontal direction Y, and the extending portions of the topsheet 3 from both side edges along the vertical direction X of the absorbent body 5 are wrapped around the non-skin-facing surface of the absorbent body 5 (more specifically, the second core 7 described below). The pair of extending portions of the topsheet 3 are each fixed to a cuff sheet 80 that constitutes the main part of a leakproof cuff 8 described below, and a pair of fixing portions 83 between the topsheet 3 and the cuff sheet 80 are formed. The topsheet 3 does not cover the entire non-skin-facing surface of the absorbent body 5, and the central portion in the horizontal direction Y of the non-skin-facing surface of the absorbent body 5 (the portion located between the pair of fixing portions 83, 83) is not covered by the topsheet 3. In this embodiment, the top sheet 3 is large enough to cover the entire skin-facing surface of the absorbent body 5, covers the entire skin-facing surface of the absorbent body 5 and both side edges along the longitudinal direction X of the absorbent body 5, and further covers a predetermined area extending inward in the transverse direction Y from both side edges on the non-skin-facing surface of the absorbent body 5.

[0018] The absorbent body 5 has a laminated structure of a first core 6 and a second core 7 arranged farther from the wearer's skin than the first core 6. As shown in Figures 3 to 6, the second core 7 has a configuration in which a water-absorbing polymer 72 is interposed between base material sheets 71, 71 arranged opposite each other in the thickness direction of the absorbent body 5.

[0019] The first core 6 is typically composed mainly of an aggregate of fibrous absorbent material, and the fiber aggregate may contain small pieces of absorbent polymer as necessary. Such an absorbent body composed mainly of a fiber aggregate can be manufactured by a conventional method using a conventionally known fiber stacking device. The fibrous absorbent material is preferably one having a property (absorbency) capable of absorbing body fluids such as urine, feces, sweat, and blood, and examples thereof include natural fibers such as wood pulp, hydrophilic synthetic fibers, and the like, and one type may be used alone or two or more types may be used in combination. The absorbent polymer may be any one that has been conventionally used in this type of absorbent body without any particular limitation, and examples thereof include polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid.

[0020] The second core 7 has a structure in which a plurality of particulate water-absorbent polymers 72 are fixed to a base sheet 71, and is characterized by being thinner and more flexible than the first core 6 which is mainly made of a fiber aggregate. The base sheet 71 is preferably a liquid-permeable sheet, and for example, paper, nonwoven fabric, etc. can be used. As the water-absorbent polymer which is the material of the water-absorbent polymer 72, any water-absorbent polymer that has been conventionally used in this type of absorbent can be used without any particular restriction, and may be the same as that used in the first core 6. In the second core 7, the base sheets 71, 71 and the base sheet 71 and the water-absorbent polymer 72 may be bonded to each other with an adhesive. The content of the water-absorbent polymer in the second core 7 is not particularly limited, but from the viewpoint of further enhancing the above-mentioned characteristics, it is preferably 80% by mass or more based on the total mass of the second core 7.

[0021] The skin-facing surface and / or non-skin-facing surface of each of the cores 6, 7 may be covered with a core wrap sheet (not shown). In this case, each of the cores 6, 7 may be individually covered with a core wrap sheet, or both of the cores 6, 7 may be integrally covered with a core wrap sheet. The core wrap sheet is preferably a liquid-permeable sheet, and for example, paper, nonwoven fabric, etc. may be used. The core wrap sheet is a component of the absorbent body 5.

[0022] In this embodiment, the first core 6 and the second core 7 have different shapes and dimensions in a plan view. That is, in a plan view of the diaper 1 in an unfolded and maximum stretched state as shown in Fig. 2, the second core 7 has a rectangular shape, whereas the first core 6 has, in the longitudinal direction X, a wide portion 61 having a relatively long length (width) in the lateral direction Y, a narrow portion 62 having a relatively short length (width) in the lateral direction Y, and a width-changing portion 63 located between the portions 61, 62 and having a gradually increasing length (width) in the lateral direction Y from the inside to the outside in the longitudinal direction X. The end portion (abdominal end portion) of the first core 6 in the longitudinal direction X on the ventral portion F side is the wide portion 61, and the end portion (dorsal end portion) of the first core 6 in the longitudinal direction X on the dorsal portion R side is the narrow portion 62. The width of the wide portion 61 is approximately the same as that of the second core 7 (see FIG. 4), whereas the width of the narrow portion 62 is narrower than that of the second core 7 (see FIG. 3). The second core 7 has a pair of extending portions 7E, 7E at least in the crotch portion M, which extend outward in the lateral direction Y from side edges of the first core 6 (narrow portion 62) along the longitudinal direction X. The length of the first core 6 in the longitudinal direction X is shorter than that of the second core 7, and a region extending a predetermined distance inward in the longitudinal direction X from an end of the second core 7 on the back side portion R side is a region where the first core 6 is not arranged. In the diaper 1, the first core 6 is biased toward the abdominal side portion F.

[0023] As described above, the exterior body 10 of the diaper 1 includes a ventral exterior body 10F and a rear exterior body 10R which are independent members. The ventral exterior body 10F has a rectangular shape that is long in the lateral direction Y when the diaper 1 is in an unfolded and maximally extended state as shown in Fig. 2. In the same state, the rear exterior body 10R has an end region in the longitudinal direction X farther from the longitudinal centerline CLx having a rectangular shape that is long in the lateral direction Y, and an end region in the longitudinal direction X closer to the longitudinal centerline CLx having a shape whose length (width) in the lateral direction Y gradually decreases toward the longitudinal centerline CLx. The exterior body 10 is disposed relatively far from the absorbent body 5 and is configured to include an outer layer sheet 11 which forms the outer surface of the diaper 1, and an inner layer sheet 12 which is disposed relatively close to the absorbent body 5 and forms the inner surface of the diaper 1. Both sheets 11, 12 are joined together and integrated by known joining means such as heat sealing, ultrasonic sealing, etc. The sheets 11 and 12 constituting the exterior body 10 may be the same type of sheet or different types of sheets. The sheets 11 and 12 may have elasticity, particularly elasticity in the lateral direction Y. As the sheets 11 and 12, nonwoven fabrics produced by various manufacturing methods can be used, and specific examples thereof include single-layer nonwoven fabrics or laminated nonwoven fabrics of two or more layers, such as air-through nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbonded nonwoven fabrics, and meltblown nonwoven fabrics. The sheets 11 and 12 may be composite sheets in which these nonwoven fabrics and films are laminated together.

[0024] In this embodiment, waist gathers are formed in the ventral portion F and the back portion R. The waist gathers include an exterior body 10 and a plurality of waist gather forming elastic members 13 fixed to the exterior body 10. The plurality of elastic members 13 extend in the width direction Y and are arranged intermittently in the longitudinal direction X. The waist gathers are produced by fixing the elastic members 13 between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 in a state in which the elastic members 13 are stretched in the width direction Y, and then releasing the elastic members 13 from the stretched state. This allows the exterior body 10 to exhibit stretchability in the width direction Y. When the diaper 1 is worn, the elastic members 13 contract to form a plurality of folds (gathers) in both sheets 11 and 12 extending in a direction intersecting the contraction direction of the elastic members 13, thereby forming the waist gathers in which the folds are substantially continuous all around the wearer's waist.

[0025] In this embodiment, leg gathers are formed at the leg edges that form the opening edges of each of the pair of leg openings LH, LH. The leg gathers are configured to include an exterior body 10 and an elastic member 14 for forming leg gathers that is fixed to the exterior body 10. The leg gathers are produced by fixing the elastic member 14 in a stretched state between the outer layer sheet 11 and the inner layer sheet 12 that constitute the exterior body 10, and then releasing the elastic member 14 from the stretched state. When the diaper 1 is worn, the contraction of the elastic member 14 forms a plurality of folds (gathers) in both sheets 11, 12 that extend in a direction intersecting the contraction direction of the elastic member 14, thereby forming the leg gathers in which the folds are substantially continuous all around the opening edges of the leg openings LH. The elastic member 14 may be one or more.

[0026] Each of the pair of leakage prevention cuffs 8, 8 has, at least in the crotch region M, a standing portion 82 that stands up toward the wearer's skin when worn, and when viewed in a plan view of the skin-facing side (top sheet 3 side) of the diaper 1 in an unfolded and maximum stretched state as shown in Figure 2, one leakage prevention cuff 8 (standing portion 82) is separated from the other by a separating portion 85. The spaced portion 85 is a gap between the free end portion 82F of the standing portion 82 of one leakage preventing cuff 8 and the free end portion 82F of the other leakage preventing cuff 8 when the diaper 1 is unfolded and fully stretched, and in this embodiment, the topsheet 3 is exposed in the spaced portion 85. In this embodiment, the length (width) W8 in the lateral direction Y of the spaced portion 85 is constant over the entire length in the longitudinal direction X of the standing portion 82 (leakage preventing cuff 8).

[0027] In this embodiment, the leakage preventing cuff 8 comprises a cuff sheet 80 which constitutes the main part of the leakage preventing cuff 8, and one or more cuff elastic members 81 which are fixed to the cuff sheet 80 and are stretchable in the longitudinal direction X. The leakage preventing cuff 8 (cuff sheet 80) is continuously disposed along the side portion of the absorbent main body 2 which is aligned in the longitudinal direction X, over substantially the entire length of the absorbent main body 2 in the longitudinal direction X. The leakproof cuff 8 mainly comprises a single cuff sheet 80 folded at a crease extending in the longitudinal direction X, and includes opposing portions of the cuff sheets 80 formed by folding the cuff sheets 80. A cuff elastic member 81 is interposed between the sheets 80, 80 at the opposing portions, and is fixed to the surrounding cuff sheet 80 by a fixing means such as an adhesive. The cuff elastic member 81 is fixed to the cuff sheet 80 in a stretched state in the longitudinal direction X at an upright portion 82, and the upright portion 82 is an elastic region that is stretchable in the longitudinal direction X. The standing portion 82 stands toward the wearer's skin from the fixed portion 83 (see Figs. 3 and 4). The standing portion 82 is a portion of the cuff sheet 80 that is not fixed to another member. The fixed portion 83 is a portion where the cuff sheet 80 is fixed to another member by a known joining means such as an adhesive or fusion. The other member to which the cuff sheet 80 is fixed in the fixed portion 83 is not particularly limited, and may be appropriately selected from the constituent members of the diaper 1 located around the cuff sheet 80 at the position where the fixed portion 83 is formed. In this embodiment, the other member is the top sheet 3 and / or the back sheet 4. The fixed portion 83 extends continuously or discontinuously in the longitudinal direction X over substantially the entire length of the cuff sheet 80 in the longitudinal direction X. As the cuff sheet 80, any material used as a leak-proof cuff in this type of absorbent article can be used without any particular restriction, such as a single-layer or multi-layer water-repellent nonwoven fabric, a laminate of a resin film and a nonwoven fabric, etc. As various elastic members in the diaper 1, including the cuff elastic member 81, any of various known elastic members normally used in this type of absorbent article can be used without any particular restriction.

[0028] 2, in this embodiment, standing inhibition sections 84, which are sections where the standing of the cuff sheet 80 is inhibited, are formed at both ends in the longitudinal direction X of the leakproof cuff 8. The standing inhibition sections 84 are formed on the ventral side section F and the dorsal side section R, and the section along the longitudinal direction X sandwiched between the standing inhibition sections 84, 84 is the standing section 82. The standing inhibition section 84 is typically formed by fixing the cuff sheet 80 to the skin-facing surface (top sheet 3) of the absorbent main body 2, and the fixing section can be formed by known joining means such as adhesives or fusion bonding. A pair of rising inhibition parts 84, 84 are formed at both ends of the leakage preventing cuff 8 in the longitudinal direction X, and when the diaper 1 is worn, a rising part 82, which is a part sandwiched between the rising inhibition parts 84, 84, rises from the fixing part 83 as a rising point toward the wearer's skin due to the contractile force of the cuff elastic member 81, as shown in Figures 5 and 6. In such an upright state of the leakage preventing cuff 8, the rising part 82 blocks the outward movement of bodily fluids, such as urine excreted by the wearer, in the lateral direction Y, so that leakage of excrement outward in the lateral direction Y (lateral leakage) is effectively suppressed. In addition, although not shown in the figure, when the leakproof cuffs 8 are in the upright state, the contractile force of the cuff elastic members 81 causes the entire diaper 1 to curve and deform so that the central portion of the absorbent body 2 in the longitudinal direction X becomes convex toward the non-skin-facing side (the back sheet 4 side), making it easier for the diaper 1 to fit the wearer's body shape.

[0029] The diaper 1 is characterized in that it satisfies all of the following (i) to (iii) when viewed in plan in an unfolded and maximally extended state as shown in FIG. (i) In the crotch portion M, "if a single imaginary straight line is drawn across the diaper 1 in the lateral direction Y, The length W8 of the portion of the imaginary straight line that overlaps with the separation portion 85 is longer than the length W6 (width of the first core 6) of the portion of the imaginary straight line that overlaps with the first core 6 (hereinafter also referred to as the “characteristic portion (i)”). (ii) In the crotch portion M, there is an overlapping portion between the standing portion 82 and the second core 7 (more specifically, the extension portion 7E). (iii) When the diaper 1 in the unfolded and maximum stretched state is taken as a reference point along a longitudinal center line CLx, which is an imaginary straight line that bisects the diaper 1 in the longitudinal direction X and extends in the transverse direction Y, the region of the diaper 1 closer to the ventral region F is taken as a ventral region Fr, and the region of the diaper 1 closer to the dorsal region R is taken as a dorsal region Rr, Fr In at least one of the back region Rr and the rear region Rr, the leakage preventing cuff 8 and the first core 6 overlap at a position outward in the longitudinal direction X from the overlapping portion of (ii) above.

[0030] With regard to (i), for example, the vertical center line CLx is the "single imaginary straight line". In this embodiment, the characteristic portion (i) includes the entire area of ​​the portion where the narrow width portion 62 of the first core 6 exists (the portion at the same position as the narrow width portion 62 in the vertical direction X), and may further include a portion of the width-changing portion 63 of the first core 6 close to the narrow width portion 62.

[0031] Since the diaper 1 satisfies all of the above (i) to (iii), even if the leakproof cuffs 8 are collapsed while the diaper 1 is being worn, for example when the wearer of the diaper 1 assumes a sitting position, a gap G is formed at least in the crotch area M between the collapsed leakproof cuffs 8 and the opposing second core 7 (more specifically, the topsheet 3 covering the skin-facing surface of the second core 7) as shown in Fig. 3, so that excrement such as urine that has migrated outward in the lateral direction Y from the first core 6 is temporarily contained in the gap G and can be absorbed by the second core 7 (the side portion of the second core 7 along the longitudinal direction X) that overlaps with the gap G in a plan view. Therefore, the diaper 1 can prevent side leakage even when the leakproof cuffs 8 are collapsed while the diaper 1 is being worn. The gap G is formed when, in a plan view of the diaper 1 in its unfolded and maximum stretched state, the standing portions 82 of the crotch portion M overlap the second core 7 without overlapping the first core 6 (satisfying the above (i) and (ii)), and the leakage preventing cuffs 8 overlap the first core 6 at a position in at least one of the abdominal region Fr and the dorsal region Rr that is outward in the longitudinal direction X from the overlapping portion between the standing portions 82 of the crotch portion M and the second core 7 (satisfying the above (iii)). That is, the standing portions 82 of the leakage preventing cuffs 8 in the collapsed state that are outward in the longitudinal direction X from the overlapping portion between the crotch portion M and the second core 7 are supported from below by the laminated structure of the first core 6 and the second core 7 as shown in Fig. 4, so that in the overlapping portion of the crotch portion M, a gap G can exist on the skin-facing surface side of the second core 7 without support from below the first core 6 as shown in Fig. 3.

[0032] In addition to the above (i) to (iii), the gap G may be formed because the second core 7 is not mainly made of a fiber aggregate as in the typical example of the first core 6, but is a so-called sheet-type absorbent having a configuration in which a water-absorbing polymer is interposed between base sheets 71 arranged opposite each other in the thickness direction. In general, absorbents mainly made of a fiber aggregate have relatively high liquid diffusibility, and liquid absorbed in the absorbent spreads quickly throughout the absorbent. Therefore, if the second core 7 is mainly made of a fiber aggregate, when the second core 7 (fiber aggregate) absorbs excrement, the excrement quickly reaches both sides of the second core 7 along the vertical direction X, causing the both sides to swell, making it difficult for the gap G to be formed. Even if the gap G is formed, it has a volume that can accommodate a certain amount of excrement, and there is a concern that it will not be an effective gap for preventing lateral leakage. In contrast, sheet-type absorbents have lower liquid diffusion properties (especially in the direction perpendicular to the thickness direction) than those mainly made of fiber aggregates, and also swell less when they absorb liquid and have excellent shape retention. Therefore, by using a sheet-type absorbent as the second core 7 arranged on the non-skin-facing side of the first core 6, it becomes easier to form a gap G that is effective in preventing lateral leakage.

[0033] With regard to the above (iii), in this embodiment, in a plan view of the diaper 1 in an unfolded and maximum stretched state as shown in Fig. 2, the leakage preventing cuffs 8 and the first core 6 overlap in the ventral region Fr. That is, in this embodiment, as shown in Fig. 2, the wide portion 61 of the first core 6 overlaps with a portion of the leakage preventing cuffs 8 at the same position in the longitudinal direction X as the wide portion 61. Such an embodiment in which the overlapping portion between the leakage preventing cuffs 8 and the first core 6 exists in the ventral region Fr is particularly effective when the wearer of the diaper 1 is a male, including a boy. When the wearer is a male, excrement such as urine is concentrated in the ventral region Fr rather than in the dorsal region Rr, so that the overlapping portion between the leakage preventing cuffs 8 and the first core 6 exists in the ventral region Fr, which is an effective portion for preventing lateral leakage, and thus lateral leakage in the ventral region Fr can be effectively prevented.

[0034] It is preferable that the first core 6 contains a water-absorbent polymer. This increases the degree of swelling of the first core 6 after absorbing liquid, and therefore increases the thickness of the first core 6 after swelling, and accordingly increases the gap G, so that the gap G can more reliably prevent side leakage. The content of the water-absorbent polymer in the first core 6 is preferably 45% by mass or more, more preferably 55% by mass or more, and preferably 75% by mass or less, more preferably 65% ​​by mass or less, based on the total mass of the first core 6, from the viewpoint of balancing the significance of including the water-absorbent polymer in the first core 6 with the prevention of adverse effects due to an excessive amount of water-absorbent polymer. The above-mentioned "adverse effects due to an excessive amount of water-absorbent polymer" means, for example, that when the first core 6 contains an excessive amount of water-absorbent polymer, the content of the fibrous water-absorbent material such as wood pulp in the first core 6 is reduced accordingly, and as a result, the thickness of the first core 6 before absorbing liquid is reduced, making it difficult to form a gap G between the collapsed leakage preventing cuff 8 and the opposing second core 7.

[0035] When the first core 6 contains a water-absorbent polymer, it is preferable that the water-absorbent polymer in the first core 6 has a larger basis weight than that in the second core 7. This allows the first core 6 to swell to a greater extent after absorbing liquid, making it easier to ensure the volume of the gap G, and the gap G can more reliably prevent side leakage. The ratio of the basis weight of the water-absorbent polymer in the first core 6 to that in the second core 7, assuming the former is greater than the latter, is preferably 1.4 or more, more preferably 1.7 or more, and is preferably 3.0 or less, more preferably 2.5 or less, in terms of former / latter, assuming the former is greater than the latter. The basis weight of the water-absorbing polymer in the first core 6 is preferably 140 g / m2, provided that the basis weight is larger than that of the second core 7. 2 More preferably, 180 g / m 2 More than 350 g / m 2 Less than 280 g / m 2 The following is the result. The basis weight of the water-absorbent polymer in the second core 7 is preferably 50 g / m 2 , assuming that the basis weight is smaller than that of the first core 6. 2More preferably, 90 g / m 2 More than 150 g / m 2 Less than 120 g / m 2 The following is the result.

[0036] In the case where the first core 6 contains a water-absorbent polymer, if the water-absorbent polymer has a relatively large absorption capacity under pressure, the shape retention of the first core 6 is improved, and even if a relatively large pressure is applied to the first core 6, for example, when the wearer sits down while wearing the diaper 1, the first core 6 is less likely to collapse, and the volume of the gap G is more likely to be secured. The absorption capacity under pressure is a measure of the maximum amount that the water-absorbent polymer contained in the absorbent body can absorb when pressure is applied to the absorbent body by wearing the absorbent article. Therefore, from the viewpoint of more reliably achieving the side leakage prevention effect by the above-mentioned gap G, the absorption capacity under pressure of the water-absorbent polymer contained in the first core 6 under pressure of 2.0 kPa is preferably 25 g / g or more, more preferably 28 g / g or more. The above-mentioned "under pressure of 2.0 kPa" is assumed to be the pressure applied to the absorbent body when the wearer sits down while wearing the absorbent article. The upper limit of the absorbency under pressure of 2.0 kPa of the water-absorbent polymer contained in the first core 6 is not particularly limited, but from the viewpoint of suppressing the discomfort during wearing caused by an excessive difference in level between the first core 6 and the second core 7 after liquid absorption, it is preferably 45 g / g or less, more preferably 35 g / g or less. The absorbency under pressure of the water-absorbent polymer is measured by the following method.

[0037] <Method for measuring absorbency under pressure> The absorbency under pressure is measured using the method and device described in JP 2003-235889 A. Specifically, it is measured in the following manner in an environment with an ambient temperature of 25±2° C. and a relative humidity of 50%±5%. That is, 0.10 g of sample (water-absorbent polymer) is weighed into a cylindrical plastic tube (inner diameter 30 mm, height 60 mm) with a 63 μm mesh nylon net (JIS Z8801-1:2000) attached to the bottom, the cylindrical plastic tube is vertically arranged so that the sample is of almost uniform thickness on the nylon net, and a weight with an outer diameter of 29.5 mm and a thickness of 22 mm is inserted into the cylindrical plastic tube so that a pressure of 2.0 kPa is applied to the sample. The masses of the cylindrical plastic tube and the weight are measured in advance. Next, immerse the cylindrical plastic tube containing the sample and weight vertically with the nylon mesh side facing down into a petri dish (diameter: 120 mm) containing 60 ml of physiological saline, making sure that the cylindrical plastic tube is immersed to the very limit of the bottom of the petri dish. After 60 minutes, the cylindrical plastic tube containing the sample and the weight is removed from the water and weighed, and the mass of the cylindrical plastic tube and the weight, which were previously measured, is subtracted to calculate the mass of the saline solution absorbed by the sample. This mass of the saline solution absorbed is multiplied by 10 to obtain the absorption amount under pressure (g / g).

[0038] From the viewpoint of ensuring the capacity of the gap G and ensuring the effect of preventing lateral leakage by the gap G, the thickness of the first core 6 in a dry state (before absorbing liquid) under a load of 2.0 kPa is preferably 2 mm or more, more preferably 3 mm or more. There is no particular upper limit to the thickness of the first core 6 in a dry state (before absorbing liquid) under a load of 2.0 kPa, but from the viewpoint of suppressing the thickness of the absorbent body 5 and improving the wearing comfort of the diaper 1, the thickness is preferably 7 mm or less, more preferably 5 mm or less. Note that the "thickness of the first core 6 under a load of 2.0 kPa" referred to here refers to the thickness of a portion of the first core 6 related to the formation of the gap G, specifically, the thickness of a portion of the first core 6 that overlaps with the leakage preventing cuff 8 in a plan view of the diaper 1 in the unfolded and maximum stretched state as shown in FIG. 2, and in this embodiment, the thickness of a side portion of the wide portion 61 along the longitudinal direction X. However, in this embodiment, the thickness of the first core 6 is uniform except for the recesses 64 described below, so the "thickness of the first core 6 under a load of 2.0 kPa" refers to the thickness of the first core 6 under a load of 2.0 kPa other than the recesses 64.

[0039] Furthermore, the ratio of "the thickness of the first core 6 in a dry state (before liquid absorption) under a load of 2.0 kPa" to "the thickness of the absorbent 5 (laminated structure of the first core 6 and the second core 7) in a dry state (before liquid absorption) under a load of 2.0 kPa" (latter / former) is preferably 0.6 or more, more preferably 0.7 or more, and preferably 0.9 or less, more preferably 0.8 or less. The thickness of the absorbent 5 (laminated structure of the first core 6 and the second core 7) in a dry state (before liquid absorption) under a load of 2.0 kPa is preferably 3 mm or more, more preferably 4 mm or more, and preferably 8 mm or less, more preferably 6 mm or less, from the viewpoint of the balance between liquid absorption performance and wearing comfort, etc. The thickness of the absorbent (first core, second core) is measured by the following method.

[0040] <How to measure thickness> A measurement target portion (for example, the first core 6) is cut out from a measurement target (for example, the absorbent body 5) to prepare a measurement sample, and the measurement sample is placed on a horizontal surface without wrinkles or bends. Then, the thickness of the measurement sample is measured under a load of 2.0 kPa. Specifically, for example, a thickness gauge PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) is used to measure the thickness. At this time, a plate (an acrylic plate with a thickness of about 5 mm) with a circular or square shape in plan view, the size of which is adjusted so that the load is 2.0 kPa, is placed between the tip of the thickness gauge and the measurement sample, and the thickness is measured. In the thickness measurement, 10 arbitrary points on the measurement sample are measured, and the average value of the thicknesses of the 10 points is calculated to be the thickness of the measurement sample.

[0041] As described above, the second core 7 has a pair of extensions 7E, 7E (see FIG. 2, etc.) at least in the crotch portion M, which extend outward in the horizontal direction Y from the side edge along the vertical direction X of the first core 6, and from the viewpoint of ensuring the capacity of the gap G and more reliably preventing lateral leakage by the gap G, in the absorbent 5 in a dry state (before liquid absorption), the separation distance H (see FIG. 5) between the skin-facing surface of the extensions 7E of the second core 7 and the skin-facing surface of the first core 6 is preferably 2.0 mm or more, more preferably 3.0 mm or more. Note that the "skin-facing surface of the first core 6" referred to here is more specifically the skin-facing surface of the side portion along the vertical direction X of the first core 6 (preferably within 10 mm from the side edge along the vertical direction X of the first core 6) which is in the vicinity of the extensions 7E of the first core 6. There is no particular upper limit to the distance H in the absorbent 5 in a dry state (before absorbing liquid), but from the viewpoint of reducing the thickness of the absorbent 5 and improving the wearing comfort of the diaper 1, it is preferably 6.0 mm or less, and more preferably 5.0 mm or less. In the diaper 1, since the second core 7 is a so-called sheet-type absorbent, the separation distance H is likely to be within the above-mentioned preferred range. That is, a sheet-type absorbent is thinner and less likely to be crushed when compressed in the thickness direction than an absorbent mainly made of a fiber aggregate such as the first core 6. Therefore, if the second core 7 is a sheet-type absorbent, when the absorbent 5 (a laminated structure of the first core 6 and the second core 7) is compressed in the thickness direction during the manufacture or wearing of the diaper 1, for example, the second core 7 is likely to be crushed and the first core 6 is likely to be prevented from sinking into the crushed portion of the second core 7. Therefore, the separation distance H between the skin-facing surface of the extension 7E of the second core 7 and the skin-facing surface of the first core 6 is likely to be 2.0 mm or more.

[0042] In order to ensure the capacity of the gap G even after the absorbent body 5 has absorbed the excrement and to more reliably prevent side leakage due to the gap G, the distance H (see FIG. 5) between the skin-facing surface of the extension 7E of the second core 7 and the skin-facing surface of the first core 6 in the absorbent body 5 in a saturated water absorption state is preferably 5 mm or more, more preferably 7 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. The "skin-facing surface of the first core 6" here is as described above. The "absorbent body in a saturated water absorption state" refers to a state in which the entire absorbent body is immersed in physiological saline at 25°C for 60 minutes and then excess water that has not been absorbed is removed from the absorbent body. This excess water can be removed, for example, by placing the absorbent body taken out of the physiological saline solution on a liquid-permeable sheet such as a net with its absorption surface (skin-facing surface) facing down and leaving it for 30 minutes in a state in which a space is formed below the absorbent body. In the diaper 1, since the second core 7 is a so-called sheet-type absorbent, the separation distance H tends to fall within the above-mentioned preferred range for the reasons described above.

[0043] The difference between the thickness of the second core 7 in a dry state (before liquid absorption) under a load of 0.05 kPa and the thickness of the second core 7 under a load of 7 kPa, calculated by subtracting the latter from the former, is preferably 0.5 mm or less, more preferably 0.3 mm or less, and ideally zero. This reduces the change in thickness of the second core 7 while the diaper 1 is being worn, thereby preventing a decrease in the separation distance H while the diaper 1 is being worn, thereby ensuring the capacity of the gap G and more reliably preventing side leakage through the gap G. load The "pressure at 7 kPa" assumes both the pressure applied to the absorbent body before the absorbent article is worn and the pressure applied to the absorbent body when the wearer stands up while wearing the absorbent article. load"Below" simulates the pressure exerted on the absorbent core when a wearer of the absorbent article (e.g., an infant) is supported by a third party (e.g., the infant's mother) via a support device such as a baby carrier or bouncer. Since the second core 7 of the diaper 1 is a so-called sheet-type absorbent core, the difference in thickness between the two types of second core 7 under load tends to be zero or close to zero.

[0044] In this embodiment, as shown in Figs. 2 and 3, the first core 6 has a recess 64 having an opening on at least one of the skin-facing surface and the non-skin-facing surface. In the illustrated embodiment, as shown in Fig. 2, the first core 6 has a rectangular shape elongated in the longitudinal direction X in a plan view, and a pair of recesses 64, 64 are formed on both sides of the transverse center line CLy of the diaper 1 in the transverse direction Y. The pair of recesses 64, 64 are each disposed at least in the crotch portion M, and further extend to the portions of the abdominal portion F and the dorsal portion R near the crotch portion M. In the illustrated embodiment, the recess 64 is a through hole penetrating the first core 6 in the thickness direction, as shown in Fig. 3, and has openings on both the skin-facing surface and the non-skin-facing surface of the first core 6. Since the second core 7 does not have the recess 64, the absorbent body 5 (a laminated structure of the first core 6 and the second core 7) has a groove-shaped recess extending in the longitudinal direction X and having a bottom at a position corresponding to the recess 64 on the skin-facing surface.

[0045] The recesses 64 are more easily permeable to excrement such as urine than are portions of the first core 6 where no recesses 64 are formed, and the excrement that has entered the recesses 64 passes through the recesses 64 in the thickness direction and is preferentially absorbed by the portions of the second core 7 that overlap with the recesses 64 in a plan view. In this embodiment, the first core 6 has the recesses 64, which have excellent liquid uptake and liquid permeability, in the portions of the first core 6 that correspond to the separated portions 85, i.e., the portions that do not overlap with the leakproof cuffs 8 (standing portions 82) in a plan view of the diaper 1 in the unfolded and maximum stretched state as shown in Fig. 2. Therefore, in the second core 7, the excrement is preferentially supplied to the portions of the second core 7 that correspond to the separated portions 85 (the center portion in the horizontal direction Y), and the excrement reaches both sides of the portion in the horizontal direction Y (both sides along the vertical direction X of the second core 7) relatively slowly. Therefore, in the diaper 1 of this embodiment, the capacity of the gap G formed at a position overlapping with both side portions of the second core 7 along the longitudinal direction X in a planar view is easily ensured, and the effect of preventing lateral leakage by the gap G can be more reliably achieved.

[0046] From the viewpoint of ensuring the above-mentioned operational effects of the recess 64, it is preferable to set the dimensions of the recess 64 as follows. From the same viewpoint, it is preferable that the recess 64 is formed in the crotch portion M as in this embodiment. The length (width) of the recess 64 in the lateral direction Y is preferably 3 mm or more, more preferably 8 mm or more, and is preferably 25 mm or less, more preferably 15 mm or less. The length of the recess 64 in the longitudinal direction X is preferably 30% or more, more preferably 40% or more, and preferably 70% or less, more preferably 60% or less of the entire length of the first core 6 in the longitudinal direction X.

[0047] The recesses 64 can be formed by not depositing the forming material (water-absorbent material) of the first core 6 in the area where the recesses 64 are to be formed, or by making the amount of the forming material deposited in the area where the recesses 64 are to be formed smaller than that in the surrounding area during the manufacturing process of the first core 6. Another method for forming the recesses 64 includes a method in which a precursor of the first core 6 having a uniform amount of the forming material deposited is manufactured, and the area where the recesses 64 are to be formed in the precursor is subjected to a compression process such as embossing. The recesses 64 formed by such a compression process have a higher density and a higher rigidity than the surrounding area of ​​the recesses 64 in the first core 6.

[0048] 7 to 10 show other embodiments of the absorbent article of the present invention (diapers 1A, 1B, 1C). In the other embodiments described below, configurations different from the diaper 1 described above will be mainly described, and configurations similar to those of the diaper 1 will be given the same reference numerals and description will be omitted. For configurations not specifically described in the other embodiments described below, the description of the diaper 1 will be applied as appropriate.

[0049] With regard to the above point (iii), in the above-mentioned diaper 1, the leakage preventing cuffs 8 and the first core 6 overlap in the ventral region Fr when viewed from above in the unfolded and maximum stretched state (see FIG. 2), but in the diaper 1A shown in FIG. 7, the leakage preventing cuffs 8 and the first core 6 overlap in the dorsal region Rr. The first core 6 of the diaper 1A has a narrow portion 62 at its ventral end in the longitudinal direction X and a wide portion 61 at its dorsal end in the longitudinal direction X, which is reversed from the first core 6 of the diaper 1. In the diaper 1A, the first core 6 is biased toward the dorsal region R. The diaper 1A also achieves the same effects as the diaper 1.

[0050] 8, in the above (iii), the leakage preventing cuffs 8 and the first core 6 overlap in both the ventral region Fr and the dorsal region Rr. The first core 6 of the diaper 1B has wide portions 61 at both ends in the longitudinal direction X (the ventral end and the dorsal end), a narrow portion 62 located in the central portion in the longitudinal direction X, and width changing portions 63 located between each of the pair of front and rear wide portions 61, 61 and the narrow portion 62. In the diaper 1B, both ends in the longitudinal direction X of the standing portions 82 of the leakage preventing cuffs 8 in the collapsed state, i.e., the portions located on both sides in the longitudinal direction X outward from the overlapping portion (the overlapping portion (ii) above) with the second core 7 (extension portion 7E) in the crotch portion M, are supported from below by the laminated structure of the first core 6 and the second core 7 as shown in Fig. 4. Therefore, compared to the diaper 1, 1A in which only one end in the longitudinal direction X of the standing portions 82 in the collapsed state (the portion located on the outer side in the longitudinal direction X outward from the overlapping portion with the second core 7 in the ventral region Fr or the dorsal region Rr of the crotch portion M), a gap G is more likely to be formed between the standing portions 82 in the collapsed state and the extension portion 7E of the second core 7 in the characteristic portion (i) of the crotch portion M. Therefore, the diaper 1B can be as effective as or better than the diapers 1, 1A in preventing side leakage.

[0051] 9 is different from the diaper 1 not having the outwardly folded portion 86 in that the leakage preventing cuff 8A has a portion (outwardly folded portion) 86 formed by folding back a portion of the cuff sheet 80 extending from the inside to the outside in the lateral direction Y outward in the lateral direction Y. The leakage preventing cuff 8A has a cuff elastic member 81A arranged at an intermediate position between the free end 82F and the fixed portion 83 in addition to one or more cuff elastic members 81 arranged at or near the free end 82F of the standing portion 82, and the standing portion 82 of the leakage preventing cuff 8A can bend at the position of the cuff elastic member 81A in the standing state as shown in FIG. 10. The leakage preventing cuff 8A has a higher leakage preventing performance than the leakage preventing cuff 8 not having the outwardly folded portion 86 because the outwardly folded portion 86 comes into contact with the wearer's body in a face-to-face manner. As shown in FIG. 10, the diaper 1C is different from the diaper 1 not configured in that both side portions (extension portions 7E) of the second core 7 along the longitudinal direction X are configured to be able to rise toward the wearer's skin while the diaper 1C is worn. In the diaper 1C, an absorbent body elastic member 51 for standing the extension portions 7E is disposed on both side edges of the second core 7 along the longitudinal direction X or in the vicinity thereof (specifically, for example, in an area within 10 mm from the side edges of the second core 7 along the longitudinal direction X). The absorbent body elastic member 51 is disposed between the second core 7 and the top sheet 3 so as to be stretchable in the longitudinal direction X, and is fixed to at least the second core 7 and further to the top sheet 3 by a known fixing means such as an adhesive. The absorbent body elastic member 51 is disposed at least in the crotch portion M, and may be one as shown in the figure, or may be multiple. In the diaper 1C, the absorber elastic members 51 are fixed in a stretched state to the extensions 7E of the second core 7, so that in the natural state of the diaper 1C, the extensions 7E stand up toward the wearer's skin due to contraction of the absorber elastic members 51, as shown in Fig. 10. At this time, the second core 7 has a tray-like shape with a bottom portion sandwiched between the pair of extensions 7E, 7E (the central portion of the second core 7 in the lateral direction Y) and a pair of extensions 7E, 7E extending obliquely from the bottom portion toward the wearer's skin as side portions. The second core 7 deforms in the same manner as in the relaxed state when the diaper 1C is worn. The diaper 1C is provided with an outwardly folded type leakage prevention cuff 8A that has excellent leakage prevention performance, and further, when worn, a part of the absorbent body 5 (extension portion 7E of the second core 7) stands up toward the wearer's skin, which, combined with the side leakage prevention effect provided by the aforementioned gap G, can more effectively prevent side leakage.

[0052] The absorbent article of the present invention is not limited to the pants-type disposable diaper as in the above embodiment, but broadly includes articles used for absorbing body fluids discharged from the human body (urine, menstrual blood, loose stool, sweat, etc.), and also includes flat-type disposable diapers, sanitary napkins, sanitary shorts, etc. equipped with so-called fastening tapes.

[0053] Although the present invention has been described based on the embodiment, the present invention is not limited to the embodiment and can be modified as appropriate. For example, the planar shape of the first core 6 is not limited to that of the above embodiment, and may be appropriately set on the condition that the desired effects of the present invention are achieved. For example, the first core 6 may not have the width varying portion 63, and may be configured to include only the wide portion 61 and the narrow portion 62. In addition, in the above embodiment, the exterior body 10 was formed separately into a ventral exterior body and a dorsal exterior body, but instead, the exterior body 10 may be formed to extend continuously from the ventral portion F to the dorsal portion R. All parts that are unique to one of the above-described embodiments can be used interchangeably as appropriate.

[0054] The following supplementary notes are further disclosed regarding the above-described embodiment of the present invention. <1> An absorbent article comprising an absorbent body having a ventral side portion arranged on the ventral side of a wearer when worn, a ventral side portion arranged on the back side of the wearer, and a crotch portion located therebetween, and having a longitudinal direction extending from the ventral side portion through the crotch portion to the back side portion and a lateral direction perpendicular to the longitudinal direction, the absorbent body absorbing and retaining bodily fluids, and a pair of leak-proof cuffs arranged from the ventral side portion to the back side portion along both side portions along the longitudinal direction of the absorbent body, The absorbent body has a laminated structure of a first core and a second core arranged farther from the wearer's skin than the first core, and the second core has a configuration in which a water-absorbent polymer is interposed between base material sheets arranged opposite each other in a thickness direction of the absorbent body, each of the pair of leakage preventing cuffs has an upstanding portion at least in the crotch portion that stands up toward the wearer's skin when worn, and one of the leakage preventing cuffs and the other of the leakage preventing cuffs are separated from each other via a separating portion in a plan view of the skin-facing surface side of the absorbent article in an unfolded and maximally stretched state; An absorbent article that satisfies all of the following (i) to (iii) when viewed in a plan view in an unfolded and maximally stretched state. (i) When a single imaginary straight line is drawn in the crotch portion that crosses the absorbent article in the horizontal direction, the length of the portion of the imaginary line that overlaps with the separation portion is longer than the length of the portion of the imaginary line that overlaps with the first core. (ii) An overlapping portion between the standing portion and the second core is present in the crotch portion. (iii) When the absorbent article in its unfolded and maximum stretched state is divided into two equal parts in the vertical direction and a virtual line extending in the horizontal direction is used as a reference, the region of the absorbent article closer to the ventral side portion is defined as the ventral region, and the region of the absorbent article closer to the dorsal side portion is defined as the dorsal region, the leakproof cuff and the first core overlap at a position in the vertical direction outer than the overlapping portion of (ii) in at least one of the ventral region and the dorsal region. <2> In the above (iii), the leak-proof cuff and the first core overlap in the abdominal region. <1> An absorbent article as described above. <3> In the above (iii), the leakage preventing cuff and the first core overlap in the back region. <1> An absorbent article as described above. <4> In the above (iii), the leakage preventing cuff and the first core overlap each other in both the ventral region and the dorsal region. <1> An absorbent article as described above.

[0055] <5> The first core comprises a water-absorbing polymer. <1> ~ <4> 13. An absorbent article according to any one of claims 1 to 12. <6> The content of the water-absorbing polymer in the first core is preferably 45% by mass or more, more preferably 55% by mass or more, and preferably 75% by mass or less, more preferably 65% ​​by mass or less, based on the total mass of the first core. <5> An absorbent article as described above. <7> The first core has a larger basis weight of the water-absorbing polymer than the second core. <5> or <6> An absorbent article as described above. <8> The ratio of the basis weight of the water-absorbing polymer in the first core to the basis weight of the water-absorbing polymer in the second core, as the former / latter, is preferably 1.4 or more, more preferably 1.7 or more, and preferably 3.0 or less, more preferably 2.5 or less; The basis weight of the water-absorbing polymer in the first core is preferably 140 g / m 2 More preferably, 180 g / m 2 More than 350 g / m 2 Less than 280 g / m 2 is as follows: The basis weight of the water-absorbing polymer in the second core is preferably 50 g / m 2 More preferably, 90 g / m 2 More than 150 g / m 2 Less than 120 g / m 2 The above-mentioned <7> An absorbent article as described above. <9> The absorbency under pressure of 2.0 kPa of the water-absorbing polymer contained in the first core is preferably 25 g / g or more, more preferably 28 g / g or more, and preferably 45 g / g or less, more preferably 35 g / g or less. <5> ~ <8> 13. An absorbent article according to any one of claims 1 to 12.

[0056] <10> The thickness of the first core in a dry state under a load of 2.0 kPa is preferably 2 mm or more, more preferably 3 mm or more, and preferably 7 mm or less, more preferably 5 mm or less. <1> ~ <9> 13. An absorbent article according to any one of claims 1 to 12. <11> The thickness of the absorbent body (a laminated structure of the first core and the second core) in a dry state under a load of 2.0 kPa is preferably 3 mm or more, more preferably 4 mm or more, and preferably 8 mm or less, more preferably 6 mm or less. <1> ~ <10> 13. An absorbent article according to any one of claims 1 to 12. <12> the second core has, at least in the crotch portion, a pair of extension portions extending outward in the lateral direction from side edges of the first core along the longitudinal direction, In the absorbent body in a dry state, the distance between the skin facing surface of the extension of the second core and the skin facing surface of the first core is preferably 2.0 mm or more, more preferably 3.0 mm or more, and preferably 6.0 mm or less, more preferably 5.0 mm or less. <1> ~ <11> 13. An absorbent article according to any one of claims 1 to 12. <13> In the absorbent body in a saturated water absorption state, the distance between the skin facing surface of the extension part of the second core and the skin facing surface of the first core is preferably 5 mm or more, more preferably 7 mm or more, and is preferably 15 mm or less, more preferably 10 mm or less. <12> An absorbent article as described above. <14> The difference between the thickness of the second core in a dry state under a load of 0.05 kPa and the thickness of the second core under a load of 7 kPa, when subtracted from the former, is preferably 0.5 mm or less, more preferably 0.3 mm or less, and even more preferably zero. <1> ~ <13> 13. An absorbent article according to any one of claims 1 to 12. <15> a recess having an opening on at least one of a skin-facing surface and a non-skin-facing surface is formed in a portion of the first core corresponding to the spaced portion; <1> ~ <14> 13. An absorbent article according to any one of claims 1 to 12. <16> The length (width) of the recess in the lateral direction is preferably 3 mm or more, more preferably 8 mm or more, and is preferably 25 mm or less, more preferably 15 mm or less; The length of the recess in the vertical direction is preferably 30% or more, more preferably 40% or more, and preferably 70% or less, more preferably 60% or less, of the entire length of the first core in the vertical direction. <15> An absorbent article as described above. <17> The leakage preventing cuff includes a cuff sheet which constitutes the main body of the leakage preventing cuff, and a portion (outer folded portion) formed by folding back a portion of the cuff sheet extending from the inside to the outside in the lateral direction to the outside in the lateral direction. <1> ~ <16> 13. An absorbent article according to any one of claims 1 to 12. <18> The first core includes a fiber aggregate of a fibrous water-absorbent material. <1> ~ <17> 13. An absorbent article according to any one of claims 1 to 12. <19> The base sheet is a liquid-permeable sheet, The content of the water-absorbing polymer in the second core is preferably 80% by mass or more based on the total mass of the second core. <1> ~ <18> 13. An absorbent article according to any one of claims 1 to 12. <20> The first core and the second core each have a skin-facing surface and / or a non-skin-facing surface covered with a core wrap sheet. <1> ~ <19> 13. An absorbent article according to any one of claims 1 to 12. <21> In a plan view of the absorbent article in an unfolded and maximally stretched state, the first core has in the vertical direction a wide portion having a relatively long length (width) in the horizontal direction, a narrow portion having a relatively short length (width) in the horizontal direction, and a width changing portion located between the wide portion and the narrow portion and having a length (width) in the horizontal direction that gradually increases from the inside to the outside in the vertical direction, and the second core has, at least in the crotch portion, a pair of extension portions that extend outward in the horizontal direction from side edges of the first core (the narrow portion) along the vertical direction, The first core has a length in the vertical direction shorter than that of the second core, and a region extending from a vertical end of the back side portion of the second core to a predetermined distance inward in the vertical direction is a non-placement region of the first core. <1> ~ <20> 13. An absorbent article according to any one of claims 1 to 12. [Explanation of symbols]

[0057] 1, 1A, 1B, 1C Pants-type disposable diapers (absorbent articles) 2. Absorbent body 3 Surface sheet 4 Back sheet 5. Absorber 51 Elastic member for absorbent body 6 First Core 61 Wide section 62 Narrow part 63 Width change section 64 Recess 7 Second Core 71 Base sheet 72 Water-absorbent polymer 7E Extension 8,8A leak proof cuff 80 Cuff Sheet 81, 81A Elastic member for cuff 82 Standing part 85 Separation part 10 Exterior body X vertical direction Y Horizontal F ventral part Fr ventral region M Inseam R dorsal part Rr dorsal region

Claims

1. An absorbent article comprising an absorbent body having a ventral side portion arranged on the ventral side of a wearer when worn, a ventral side portion arranged on the back side of the wearer, and a crotch portion located therebetween, and having a longitudinal direction extending from the ventral side portion through the crotch portion to the back side portion and a lateral direction perpendicular to the longitudinal direction, the absorbent body absorbing and retaining bodily fluids, and a pair of leak-proof cuffs arranged from the ventral side portion to the back side portion along both side portions along the longitudinal direction of the absorbent body, The absorbent body has a laminated structure of a first core and a second core disposed farther from the wearer's skin than the first core, The first core is mainly made of a fiber aggregate containing a water-absorbent polymer, the second core has a configuration in which a water-absorbent polymer is interposed between base sheets arranged opposite each other in a thickness direction of the absorbent body, The content of the water-absorbing polymer in the second core is 80% by mass or more based on the total mass of the second core; The ratio of the basis weight of the water-absorbent polymer in the first core to the basis weight of the water-absorbent polymer in the second core is 1.4 or more and 3.0 or less, as the former / latter; each of the pair of leakage preventing cuffs has an upstanding portion at least in the crotch portion that stands up toward the wearer's skin when worn, and one of the leakage preventing cuffs and the other of the leakage preventing cuffs are separated from each other via a separating portion in a plan view of the skin-facing surface side of the absorbent article in an unfolded and maximally stretched state; An absorbent article that satisfies all of the following (i) to (iii) when viewed in a plan view in an unfolded and maximally stretched state: (i) When a single imaginary straight line is drawn in the crotch portion that crosses the absorbent article in the horizontal direction, the length of the portion of the imaginary line that overlaps with the separation portion is longer than the length of the portion of the imaginary line that overlaps with the first core. (ii) An overlapping portion between the standing portion and the second core is present in the crotch portion. (iii) When a virtual line extending laterally and dividing the absorbent article in an unfolded and fully stretched state into two equal parts in the vertical direction is taken as a reference, the region of the absorbent article closer to the ventral side portion is taken as the ventral region, and the region of the absorbent article closer to the dorsal side portion is taken as the dorsal region, the leakproof cuff and the first core overlap at a position vertically outward of the overlapping portion of (ii) in at least one of the ventral region and the dorsal region.

2. The absorbent article according to claim 1 , wherein in (iii), the leak-proof cuffs and the first core overlap in the abdominal region.

3. The absorbent article according to claim 1 , wherein in (iii), the leak-proof cuffs and the first core overlap each other in both the ventral region and the dorsal region.

4. The absorbent article according to any one of claims 1 to 3, wherein the content of the water-absorbent polymer in the first core is 45% by mass or more and 75% by mass or less with respect to the total mass of the first core.

5. The absorbent article according to claim 4 , wherein the absorbent polymer contained in the first core has an absorption capacity under pressure of 2.0 kPa of 25 g / g or more.

6. The absorbent article according to any one of claims 1 to 5, wherein the first core in a dry state has a thickness of 2 mm or more under a load of 2.0 kPa.

7. the second core has, at least in the crotch portion, a pair of extension portions extending outward in the lateral direction from side edges of the first core along the longitudinal direction, The absorbent article according to any one of claims 1 to 6, wherein in the absorbent body in a dry state, the distance between the skin-facing surface of the extension portion of the second core and the skin-facing surface of the first core is 2 mm or more.

8. The absorbent article according to claim 7 , wherein in the absorbent body in a saturated water absorption state, a distance between the skin facing surface of the extension portion of the second core and the skin facing surface of the first core is 5 mm or more.

9. The absorbent article according to any one of claims 1 to 8, wherein the difference between the thickness of the second core in a dry state under a load of 0.05 kPa and the thickness of the second core under a load of 7 kPa is 0.5 mm or less when the latter is subtracted from the former.

10. The absorbent article according to any one of claims 1 to 9, wherein a recess having an opening is formed in at least one of a skin-facing surface and a non-skin-facing surface in a portion of the first core corresponding to the spaced portion.

Images