Absorbent article

Abstract

In an absorbent article (1) provided with an absorbent core (11a), the absorbent core (11a) has a central region (11aCV) and a side region (11aSV) in a crotch section spanning a central position (CL) in the lengthwise direction of an absorbent body (10), the absorbent core (11a) has a pair of guide sections (11G) in the lengthwise direction at the boundary between the central region (11aCV) and the side region (11aSV) in the left-right direction, and the guide sections (11G) are arranged in the lengthwise direction at the central position (CL). The length (L1) in the left-right direction of the central region (11aCV) is smaller than the length (L2) in the left-right direction of any one of the side regions (11aSV), and the inducing portions (11G) induce deformation when worn so that the portions from the inducing portions (11G) to the end portions (11ae) in the left-right direction of the absorbent core (11a) face the thighs of the wearer.

Description

Technical Field

[0001] The present invention relates to absorbent articles. Background Art

[0002] The following technology is known in the past: in an absorbent article having an absorbent body for absorbing excretion fluids such as urine or menstrual blood, when worn, the absorbent body is deformed by bending or the like, thereby achieving improved leakage resistance and improved matching. For example, Patent Document 1 discloses a disposable diaper having a central absorbent body and a second absorbent body, and when the diaper is worn, the central absorbent body and the second absorbent body are bent between them, and the second absorbent body is bent toward the thigh of the wearer. Patent Document 2 discloses an absorbent article, wherein the absorbent core has a central low basis weight portion of the absorbent core located in the central part in the width direction, the basis weight of which is lower than that of the surroundings, and a pair of side low basis weight portions located on both sides in the width direction, and when worn, the cross section of the absorbent core is deformed into a W shape with the two side ends of the central low basis weight portion and the side low basis weight portions as starting points.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4229581

[0006] Patent Document 2: Japanese Patent Application Publication No. 2017-217160 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Patent Document 1, when worn, takes the form of close-fitting shorts and has excellent anti-leakage performance. However, when worn by a user with thick thighs, due to the small crotch width, if the width direction length of the portion corresponding to the crotch is long, the absorbent body cannot withstand the external pressure of the thighs and is compressed from the outside in the width direction and loses its shape, the width of the absorbent body becomes smaller, and there is a possibility of leakage. In addition, Patent Document 2 makes the absorbent core close to the wearer to prevent the side leakage of body fluids, but if there are many deformation starting points in the width direction of the absorbent core, when rubbed by thick thighs, the outer part of the width direction of the absorbent body sometimes becomes so-called wrinkled, making it difficult to ensure the function as an absorbent core.

[0009] The present invention is made in view of the above-mentioned problems, and its purpose is to provide an absorbent article in which the absorbent core is unlikely to move out of shape in the crotch even when worn by a user with thick thighs, and can fit the body to suppress leakage.

[0010] Solutions to Solve Problems

[0011] The main invention for achieving the above-mentioned purpose is an absorbent article, which has a longitudinal direction, a left-right direction and a thickness direction that intersect each other in an unfolded and stretched state, and the absorbent article has an absorbent body with an absorbent core, characterized in that the absorbent core has a central area located in the center of the left-right direction and side areas located on the two outer sides of the left-right direction of the central area in the crotch part that spans the central position of the longitudinal direction of the absorbent body, and the absorbent core has a pair of inducing parts along the longitudinal direction at the junction of the central area and the side areas in the left-right direction, and at the central position, the length of the central area in the left-right direction is smaller than the length of any of the side areas located on the two outer sides in the left-right direction, and the inducing part induces deformation when the absorbent article is worn so that the part from the inducing part to the end of the absorbent core in the left-right direction faces the wearer's thigh.

[0012] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to provide an absorbent article in which, even when worn by a user with thick thighs, the absorbent core is unlikely to move out of shape at the crotch and can fit closely to the body to suppress leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic front view of the underpants type disposable diaper 1.

[0016] Figure 2 It is a schematic plan view of the diaper 1 in the unfolded state and the stretched state.

[0017] Figure 3 It is a plan view for explaining the structure of the absorbent body 10 and the leakage preventing wall 50.

[0018] Figure 4 yes Figure 3 A schematic cross-sectional view taken along the A-A line.

[0019] Figure 5A This is a schematic cross-sectional view showing deformation of the absorbent core 11a during wear.

[0020] Figure 5B Yes Figure 3 A magnified portion of the image.

[0021] Figure 6 This is a schematic plan view of the diaper 1 ′ in the unfolded and stretched state according to the second embodiment as viewed from the skin side.

[0022] Figure 7 It is a plan view explaining the structure of the absorbent body 10 according to the second embodiment.

[0023] Figure 8 yes Figure 7 A schematic cross-sectional view taken along the BB line of FIG.

[0024] Fig. 9 This is a schematic cross-sectional view showing deformation of the absorbent core 110 (111, 112) during wear. DETAILED DESCRIPTION

[0025] At least the following matters will be apparent from the description of this specification and the accompanying drawings.

[0026] Style 1 is an absorbent article, which has mutually intersecting longitudinal direction, left-right direction and thickness direction in the unfolded and stretched state, and the absorbent article has an absorbent body with an absorbent core, characterized in that the absorbent core has a central area located in the center of the left-right direction and side areas located on the two outer sides of the left-right direction of the central area in the crotch part spanning the central position of the longitudinal direction of the absorbent body, and the absorbent core has a pair of inducing parts along the longitudinal direction at the junction of the central area and the side areas in the left-right direction, at the central position, the length of the central area in the left-right direction is smaller than the length of any one of the side areas located on the two outer sides, and the inducing part induces deformation when the absorbent article is worn so that the part from the inducing part to the end of the absorbent core in the left-right direction faces the wearer's thigh.

[0027] According to the absorbent article of pattern 1, when the absorbent article is worn, the central area of ​​the absorbent core is easily deformed into a convex shape toward the skin side by the guide part, and the width (length in the left-right direction) of the central area convex toward the skin side is smaller than the width of the side area, so that the central area is difficult to be deformed by compression from both sides of the absorbent core in the left-right direction. Furthermore, by promoting deformation so that the area from the guide part to the left and right ends of the absorbent core faces the wearer's thighs, the shape deformation of the absorbent core caused by friction of the thick thighs can be suppressed, and leakage can be prevented.

[0028] Style 2 is an absorbent article having mutually intersecting longitudinal, left-right and thickness directions in an unfolded and stretched state, the absorbent article having an absorbent body with an absorbent core, characterized in that the absorbent core has a central region located in the center of the left-right direction and side regions located on both outer sides of the left-right direction of the central region in the crotch portion spanning the central position of the longitudinal direction of the absorbent body, the absorbent core having a pair of inducing portions along the longitudinal direction at the junction of the central region and the side regions in the left-right direction, at the central position, the length of the central region in the left-right direction is smaller than the length of any one of the side regions located on the two outer sides in the left-right direction, and the length of one of the side regions in the left-right direction is less than twice the length of the central region in the left-right direction.

[0029] According to the absorbent article of pattern 2, when the absorbent article is worn, the central area of ​​the absorbent core is easily deformed into a convex shape toward the skin side by the guide portion, and the width of the central area is smaller than the width of the side areas, so that the central area is difficult to be deformed by the external pressure from the left and right sides of the absorbent core. Compared with the case where the width of the side area (the length in the left and right direction) exceeds twice the width of the central area, when the width of the side area is less than twice the width of the central area, it is difficult for the side area to be twisted or deformed even if it is rubbed by thick thighs during wearing.

[0030] Style 3 is an absorbent article having mutually intersecting longitudinal, left-right and thickness directions in an unfolded and stretched state, the absorbent article having an absorbent body with an absorbent core, characterized in that the absorbent core has a central region located in the center of the left-right direction and side regions located on both outer sides of the left-right direction of the central region in a crotch portion at a central position in the longitudinal direction of the absorbent body, the absorbent core having a pair of inducing portions along the longitudinal direction at the junction of the central region and the side regions in the left-right direction, at the central position, the length of the central region in the left-right direction is smaller than the length of any one of the side regions located on the two outer sides in the left-right direction, the absorbent core having liquid-absorbent fibers, and in the absorbent core, when an area where the liquid-absorbent fibers exist is set as an existence area and an area where the liquid-absorbent fibers do not exist is set as a non-existence area, the side regions are constituted only by the existence area.

[0031] According to the absorbent article of pattern 3, when the absorbent article is worn, the central area of ​​the absorbent core is easily deformed into a convex shape toward the skin side by the guide portion, and the width of the central area is smaller than the width of the side areas, so that the central area is difficult to be deformed by the external pressure from the left and right sides of the absorbent core. Furthermore, in the side areas, since the liquid-absorbent fibers are present throughout the entire area, the rigidity is improved, and even if the side areas are rubbed by thick thighs during wearing, the shape of the absorbent core can be suppressed.

[0032] Mode 4 is the absorbent article according to any one of Modes 1 to 3, wherein at least the side regions have a mechanism for improving the rigidity of the absorbent core.

[0033] According to the absorbent article of the embodiment 4, by increasing the rigidity of the side regions, it is possible to further suppress the side regions from being deformed due to friction between the thighs during wear.

[0034] Mode 5 is the absorbent article according to any one of Modes 1 to 4, wherein the side regions have compressed portions.

[0035] According to the absorbent article of the embodiment 5, since the compressed portion is provided, the rigidity of the side regions is increased, and the displacement of the absorbent core due to the friction of the thick thighs can be suppressed.

[0036] Style 6 is an absorbent article as described in any one of Styles 1 to 5, wherein a central stretchable member that is stretchable in the longitudinal direction is provided in the central portion of the crotch portion in the left-right direction, and the central region has a portion that overlaps with the central stretchable member when viewed in the thickness direction.

[0037] According to the absorbent article of pattern 6, the central region is more easily deformed toward the skin side (crotch side) by utilizing the central stretch member, and it is easy to suppress the absorbent core from being deformed due to external pressure from the left and right directions during wearing.

[0038] Style 7 is an absorbent article as described in Style 6, wherein the absorbent core has a narrowing portion between the two ends in the longitudinal direction whose width in the left-right direction is smaller than that of the two ends, and the central telescopic member is provided in the region where the narrowing portion exists in the longitudinal direction.

[0039] According to the absorbent article such as style 7, the narrowing portion is the part corresponding to the crotch portion of the wearer when worn. By contracting the central telescopic member provided in the area of ​​such a narrowing portion, the distance between the absorbent core at the narrowing portion and the urination opening can be shortened, thereby suppressing leakage.

[0040] Pattern 8 is an absorbent article according to pattern 6 or 7, wherein when one side in the longitudinal direction is the wearer's ventral side and the other side in the longitudinal direction is the wearer's back side, the length from the end of the ventral side to the central position in the longitudinal direction of the central elastic member is greater than the length from the end of the back side to the central position.

[0041] According to the absorbent article of pattern 8, the central elastic member is arranged toward the so-called ventral side. By contraction of the central elastic member, the distance between the urination opening located on the front side (ventral side) and the absorbent core can be shortened accordingly, making it easier to absorb urine, thereby suppressing leakage.

[0042] Style 9 is an absorbent article as described in any one of Styles 1 to 3 and Styles 6 to 8, wherein the absorbent core has a first absorbent core and a second absorbent core arranged on the non-skin side in the thickness direction relative to the first absorbent core, and the side area has an overlapping area where the first absorbent core and the second absorbent core overlap when viewed in the thickness direction.

[0043] According to the absorbent article of the embodiment 9, the rigidity of the overlapping region where the first absorbent core and the second absorbent core overlap in the side region is improved, and the displacement of the absorbent core due to friction of thick thighs can be suppressed.

[0044] Style 10 is an absorbent article as described in Style 9, wherein at least one of the first absorbent core and the second absorbent core has a narrowing portion between the two end portions in the longitudinal direction whose width in the left-right direction is smaller than that of the two end portions, and the side region is arranged in the region where the narrowing portion is provided in the longitudinal direction, and the rigidity of the overlapping region in the side region is greater than the rigidity of the portion other than the narrowing portion.

[0045] According to the absorbent article of the embodiment 10, since the overlapping regions of the side regions have high rigidity, it is possible to prevent the absorbent core from being displaced due to friction of the thighs during wear.

[0046] Mode 11 is the absorbent article according to mode 9 or 10, wherein in the left-right direction of the side region, the outer end of the first absorbent core is located outside the outer end of the second absorbent core.

[0047] According to the absorbent article such as style 11, the width of the first absorbent core located on the skin side is greater than the width (length in the left-right direction) of the second absorbent core located on the non-skin side, so that the surface of the first absorbent core close to the wearer's skin can be reliably attached to the thigh, making leakage difficult to occur.

[0048] Style 12 is an absorbent article as described in any one of styles 9 to 11, wherein the second absorbent core has a narrowing portion between the two end portions in the longitudinal direction whose width in the left-right direction is smaller than that of the two end portions, and the first absorbent core is arranged in the longitudinal direction in the area where the narrowing portion is provided.

[0049] According to the absorbent article such as style 12, the narrowing portion is the part corresponding to the wearer's crotch. The first absorbent core is arranged in the area of ​​the narrowing portion which is easily deformed by external forces from the left and right directions during wearing. As a result, the rigidity of the narrowing portion is improved and the absorbent core is difficult to deform.

[0050] Mode 13 is the absorbent article according to any one of modes 9 to 12, wherein in the central region, at least one of the first absorbent core and the second absorbent core is provided with a low basis weight portion having a basis weight lower than that of the surrounding area.

[0051] According to the absorbent article of pattern 13, in the central region which is induced to deform convexly toward the skin side when worn, the low basis weight portion serves as the deformation starting point and is easily deformed convexly toward the skin side.

[0052] Style 14 is an absorbent article as described in any one of Styles 9 to 13, wherein at the central position, the length of the first absorbent core in the left-right direction is greater than the length of the second absorbent core in the left-right direction, and when the length of the central area in the left-right direction is set to length L1, at the central position and on one side of the left-right direction, the length from the outer end of the first absorbent core on one side in the left-right direction to the outer end of the second absorbent core on one side in the left-right direction is less than the length L1.

[0053] According to the absorbent article of pattern 14, the width of the second absorbent core is smaller than the width of the first absorbent core at the central position, and the difference between the second absorbent core and the first absorbent core is smaller than the length L1 of the central region in the left-right direction. Therefore, in the absorbent core, the second absorbent core also extends to the vicinity of the end in the left-right direction, and the rigidity is also easily maintained at the end in the left-right direction. Therefore, it is easy to keep the absorbent core in a planar shape, and leakage can be suppressed.

[0054] Style 15 is an absorbent article as described in any one of Styles 1 to 14, wherein the absorbent article has a pair of leakage-proof wall portions, the pair of leakage-proof wall portions having elastic components that can shrink in the longitudinal direction and being arranged on both sides of the absorbent body in the left-right direction, and at the central position and on one side of the left-right direction, the length from the outer end to the inner end of the leakage-proof wall portion in the left-right direction on the one side is less than half of the length in the left-right direction from the outer end to the induction portion on the one side.

[0055] According to the absorbent article of pattern 15, the leakage-proof wall stands up when worn, but if the length of the leakage-proof wall in the left-right direction is long, there is a possibility that the absorption surface of the absorbent body is covered by the leakage-proof wall. By setting the length of the leakage-proof wall in the left-right direction not too long, the absorption surface is not covered, and leakage can be prevented.

[0056] Style 16 is an absorbent article as described in Style 15, wherein the absorbent core has a narrowing portion between the two end portions in the longitudinal direction whose width in the left-right direction is smaller than that of the two end portions, and when the shortest portion in the left-right direction in the narrowing portion is set as the narrowest portion, at the central position and on one side in the left-right direction, the length from the outer end to the inner end in the left-right direction of the leakage-proof wall portion on the one side is smaller than the length in the left-right direction from the outer end to the end of the narrowest portion on the one side.

[0057] According to an absorbent article such as style 16, the left-right length of the leakage-proof wall portion at the narrowest part of the absorbent core is set to a length that does not reach the narrowest part of the absorbent core. As a result, the leakage-proof wall portion 50 will not cover the narrowest part, and the absorbent core can reliably perform its absorption function and prevent leakage.

[0058] Style 17 is an absorbent article as described in any one of Styles 1 to 16, wherein the absorbent body has a top sheet arranged on the skin side in the thickness direction relative to the absorbent core and a sub-sheet arranged between the top sheet and the absorbent core, and the central area is arranged in the area where the sub-sheet is provided in the left-right direction and has a portion overlapping with the sub-sheet when viewed in the thickness direction.

[0059] According to the absorbent article of pattern 17, by providing the central region in the region where the secondary sheet is provided, the rigidity of the central region becomes high, and when the central region is induced to deform when the absorbent article is worn, the central region is less likely to be distorted, and fitting is easy.

[0060] Style 18 is an absorbent article as described in any one of Styles 1 to 17, wherein the absorbent article has a waist portion having a waist elastic component that can be stretched and retracted in the left-right direction and is arranged on the waist of the wearer, the absorbent core has a first absorbent core and a second absorbent core that is arranged on the non-skin side in the thickness direction compared to the first absorbent core, in the longitudinal direction, the first absorbent core is arranged at a position away from the waist elastic component, and the second absorbent core has a portion overlapping with the waist elastic component.

[0061] According to the absorbent article of pattern 18, although the rigidity is improved by having the first absorbent core and the second absorbent core, if there are two layers of absorbent bodies even in the area where the waist elastic member is provided, there is a possibility that a stiff feeling will be generated when it is closely attached to the waist. The waist area is also a part away from the crotch, and absorption performance is not required like the crotch. Therefore, by setting a structure having a part with only one layer (second absorbent core) overlapping, the stiff feeling can be reduced and leakage can be prevented.

[0062] ===First Implementation Method===

[0063] Hereinafter, as an absorbent article according to the first embodiment of the present invention, a pants-type disposable diaper for adults (hereinafter also referred to as "diaper 1") is cited as an example. However, the absorbent article according to the present invention can also be used as a pants-type disposable diaper for infants, a belt-type disposable diaper for infants or adults, a sanitary napkin, a sanitary panty, etc.

[0064] <<Basic structure of pants type disposable diaper 1>>

[0065] Figure 1 It is a schematic front view of the underpants type disposable diaper 1. Figure 2 It is a schematic plan view of the diaper 1 in the unfolded state and the stretched state. Figure 3 It is a plan view for explaining the structure of the absorbent body 10 and the leakage preventing wall 50. Figure 4 yes Figure 3 Here, the "expanded state" of the diaper 1 refers to a state in which the diaper 1 is expanded in the longitudinal direction by releasing the joining of the waist joint 40 described later and separating the pair of waist portions 20 and 30.

[0066] Diapers 1 in Figure 1 In the shorts-type state shown, the upper and lower directions, left and right directions, and front and back directions intersect each other, and a waist opening BH and a pair of leg openings LH are formed. Figure 2 In the unfolded state shown, the diaper 1 has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other. The longitudinal direction is the direction along the up-down direction of the pants-type state. The thickness direction is the direction in which the components constituting the diaper 1 are stacked (see Figure 4 ). In the up-down direction, the waist opening BH side is set as the upper side, and the crotch side is set as the lower side. In the front-back direction, the side that will become the wearer's ventral side is set as the front side, and the side that will become the wearer's back side is set as the back side. In the thickness direction, the side that contacts the wearer's body (skin) is set as the skin side, and the side that does not contact the wearer's body (skin) is set as the non-skin side.

[0067] In addition, the "stretched state" of the diaper 1 refers to a state in which the diaper 1 as a whole (the entire product) is stretched to a wrinkle-free state by stretching each elastic member (for example, the waist elastic member 23, 33 or the leakage-proof wall elastic member 51 described later) of the diaper 1. Specifically, it refers to a state in which the size of each member constituting the diaper 1 (for example, the absorbent body 10 or the waist portion 20, 30 described later) becomes the same as or close to the size of the member alone.

[0068] The diaper 1 has a pair of waist portions 20, 30 arranged around the waist of the wearer and an absorbent body 10. Of the pair of waist portions 20, 30, the waist portion attached to the wearer's abdomen is the abdomen waist portion 20, and the waist portion attached to the wearer's back is the back waist portion 30.

[0069] Diapers 1 in Figure 2 In the unfolded state shown, the end of one side of the longitudinal direction of the absorbent body 10 is arranged in the central part of the ventral waistline portion 20 in the left-right direction, and the non-skin side of the end on one side is joined to the ventral waistline portion 20 by an adhesive such as a hot-melt adhesive. Similarly, the end of the other side of the longitudinal direction of the absorbent body 10 is arranged in the central part of the dorsal waistline portion 30 in the left-right direction, and the non-skin side of the end on the other side is joined to the dorsal waistline portion 30 by an adhesive such as a hot-melt adhesive. In the unfolded diaper 1, the absorbent body 10 is folded in half at the central position CL in the longitudinal direction thereof, and the left-right side portions of the ventral waistline portion 20 and the dorsal waistline portion 30 are joined at a pair of waistline joints 40, thereby forming a diaper 1. Figure 1 The diaper 1 is in a pants-type state as shown. As a joining method at the waist joint 40, welding or joining by an adhesive can be exemplified.

[0070] like Figure 4 As shown in the figure, the absorbent body 10 comprises: an absorbent body 11 for absorbing excrement; a liquid-permeable top sheet 12 arranged on the skin side in the thickness direction relative to the absorbent body 11; a liquid-impermeable back sheet 13 arranged on the non-skin side in the thickness direction relative to the absorbent body 11; and a sheet member 14. In addition, a secondary sheet 15 is provided between the top sheet 12 and the absorbent body 11. The top sheet 12 is folded back toward the non-skin side in the left-right direction in a manner of rolling up the absorbent body 11. A part of the sheet member 14 is arranged on the non-skin side relative to the back sheet 13, and the other part forms a leak-proof wall portion 50 at a position closer to the skin side than the top sheet 12.

[0071] The absorbent body 11 includes an absorbent core 11a that absorbs and retains excretion such as urine, and a liquid-permeable core wrap sheet 11b that covers the absorbent core 11a. The absorbent core 11a may be formed by forming liquid-absorbent fibers such as pulp containing a superabsorbent polymer (SAP) into a predetermined shape. On the other hand, the core wrap sheet 11b may be, for example, a tissue.

[0072] The absorbent core 11a of this embodiment has a narrowed portion 11ac between the two ends in the longitudinal direction, which is shorter in length (smaller in width) than the two ends in the left-right direction. Figure 3 The narrowed portion 11ac is a portion that is sandwiched between the legs of the wearer when the diaper 1 is worn, and by shortening the length of this portion in the left-right direction (reducing the width), the absorbent core 11a is easily matched with the crotch of the wearer.

[0073] In addition, if Figure 2 as well as Figure 3 As shown, the absorbent body 11 has a compressed portion 18 embossed over the entire region. The compressed portion 18 will be described in detail later.

[0074] The top sheet 12 is a sheet-like member that covers the absorbent body 11 from the skin side, and is formed of, for example, a liquid-permeable nonwoven fabric having a larger plane size than the absorbent body 11 .

[0075] The back sheet 13 is a sheet-like member that covers the absorbent body 11 from the non-skin side, and for example, a liquid-impermeable leakproof sheet such as polyethylene or polypropylene can be cited. As the sheet member 14, for example, a nonwoven fabric can be cited. In addition, the secondary sheet 15 is a sheet-like member that covers at least a portion of the absorbent body 11 from the skin side, and for example, a liquid-permeable nonwoven fabric having a smaller plane size than the absorbent body 11 can be cited.

[0076] The absorbent body 10 is provided with a pair of leakproof walls 50 along its longitudinal direction on both sides in the left-right direction. When wearing the diaper 1, the leakproof walls 50 stand up from both sides in the left-right direction of the absorbent body 11 toward the skin side of the wearer, thereby suppressing excrement from leaking out toward the outside of the absorbent body 10. In the present embodiment, the plane size in the left-right direction of the sheet member 14 of the outer dress constituting the absorbent body 10 is larger than the top sheet 12 and the absorbent core 11a, and the two sides in the left-right direction of the sheet member 14 are bent toward the skin side in the thickness direction at the two ends in the left-right direction of the absorbent body 10 with the fulcrum 50B as the bending starting point. And, the fulcrum 50E located on the skin side is folded back toward the inner side in the left-right direction compared to the top sheet 12, and the end of the left-right direction of the top sheet 12 is joined at the joint 50A along the longitudinal direction, thereby forming the leakproof wall 50.

[0077] In addition, an elastic member that can shrink in the longitudinal direction is fixed to the leakage-proof wall 50 between the two stacked sheet members 14, 14 in a state of being stretched in the longitudinal direction of the absorbent body 10. In the present embodiment, as the elastic member, a plurality of leakage-proof wall elastic members 51 such as rubber threads are arranged in the left-right direction. When the diaper 1 is worn, the leakage-proof wall 50 shrinks in the longitudinal direction of the absorbent body 10 and stands up toward the skin side of the wearer based on the elasticity of the leakage-proof wall elastic member 51 (elastic member) to match the crotch of the wearer.

[0078] In addition, the leak-proof wall 50 is fixed at the front end and the rear end in the longitudinal direction of the absorbent body 10 by means of fixing parts (not shown) respectively provided at the front end and the rear end in a manner that prevents it from standing up. Therefore, the leak-proof wall 50 can stand up toward the wearer's skin side in the longitudinal direction of the absorbent body 10 in the area between the front fixing part and the rear fixing part. In addition, Figure 2 as well as Figure 3 The leakage preventing wall elastic member 51 of the leakage preventing wall portion 50 in FIG. 1 shows only the portion that exhibits stretchability.

[0079] In addition, in this embodiment, if Figure 2 as well as Figure 3 As shown in the figure, in the absorbent body 11, the absorbent core 11a has a plurality of linear compression parts 18. Specifically, in the "compression part" of this embodiment, the absorbent body 11 (absorbent core 11a and core wrap sheet 11b) is compressed in the thickness direction by embossing. And, there are a plurality of roughly diamond-shaped inner areas surrounded by the compression parts 18. Through compression, the fiber density of the absorbent core 11a becomes higher than that of the uncompressed part. In addition, the compression parts 18 of this embodiment are Figure 2 as well as Figure 3 Although shown in the figure by dotted lines, this is for convenience of explanation. In fact, it is formed by embossing the absorbent body 11 as described above, and therefore, it cannot be clearly recognized from the skin side of the diaper 1.

[0080] In addition, the compression part 18 of this embodiment is formed in a linear shape, but the linear compression part 18 may be formed by a collection of a plurality of dot-shaped (circular) compression parts, for example. Alternatively, the dot-shaped compression parts or the linear compression parts may be formed dispersedly in a predetermined area. In addition, as a formation pattern of the compression part 18, Figure 3 The compression portion 18 shown is arranged in a manner that can be viewed as a lattice pattern (so-called raised pattern) as a whole, but other patterns may also be used. Furthermore, the individual lines constituting the lattice pattern may be composed of Figure 3 Such straight line composition can also be composed of curved lines.

[0081] In the compression part 18 of the present embodiment, the absorbent core 11a and the core wrapping sheet 11b are compressed in the thickness direction, but at least the absorbent core 11a is compressed in the thickness direction. In addition, for example, the absorbent core 11a, the core wrapping sheet 11b and the top sheet 12 may be compressed in the thickness direction.

[0082] In addition, in the absorbent body 10, a plurality of central telescopic members 16 such as rubber threads that are telescopic in the longitudinal direction are provided in the central part in the left-right direction and the longitudinal direction. Specifically, in the thickness direction, between the backsheet 13 and the sheet member 14, a plurality of central telescopic members 16 are installed in a state where they are spaced apart in the left-right direction and stretched in the longitudinal direction. Only the elastic part of the central telescopic member 16 is shown in the figure. The length of the central telescopic member 16 in the longitudinal direction only needs to be provided at least in the crotch portion (the crotch portion MA described later) facing the crotch of the wearer. In addition, the central telescopic member 16 is not limited to a thread-like elastic member such as a rubber thread. For example, a plurality of band-like rubber threads or a telescopic sheet (a telescopic film or a telescopic nonwoven fabric) may be provided at intervals in the left-right direction, or a telescopic sheet of a specified size may be provided.

[0083] The ventral waistline portion 20 and the dorsal waistline portion 30 respectively include: an inner layer sheet 21, 31; an outer layer sheet 22, 32 arranged on the non-skin side compared to the inner layer sheet 21, 31; and a plurality of waist elastic members 23, 33 that can be stretched in the left-right direction. Figure 2 As shown, in the diaper 1, the area between the ventral waistline portion 20 and the dorsal waistline portion 30 is defined as a crotch portion MA. The crotch portion MA is a portion corresponding to the crotch of the wearer when the diaper is worn.

[0084] The inner layer sheets 21, 31 and the outer layer sheets 22, 32 are arranged on the non-skin side relative to the absorbent body 10. As the inner layer sheets 21, 31 and the outer layer sheets 22, 32, SMS nonwoven fabrics (spunbond / meltblown / spunbond nonwoven fabrics), spunbond nonwoven fabrics, hot air nonwoven fabrics, plastic sheets, perforated plastic sheets, and laminated sheets thereof can be used.

[0085] The waist elastic members 23, 33 are arranged in the up-down direction between the inner layer sheets 21, 31 and the outer layer sheets 22, 32 in the shorts-type state, and are fixed in the stretched state in the left-right direction. Therefore, the ventral waistline portion 20 and the back waistline portion 30 match the waistline of the wearer. As the waist elastic members 23, 33, thread-like elastic members such as rubber or spandex can be exemplified. In addition, a cover sheet (not shown) covering the upper end of the absorbent body 10 from the skin side can also be provided.

[0086] exist Figure 2In the unfolded and stretched state, the ventral waistline portion 20 is rectangular when viewed from above. The dorsal waistline portion 30 has: an overlapping portion 30A overlapping with the ventral waistline portion 20 in the front-to-back direction of the diaper 1 in the shorts-type state; and an extension portion 30B extending downwardly compared to the ventral waistline portion 20. The overlapping portion 30A is rectangular when viewed from above, and the extension portion 30B is an inverted trapezoid when viewed from above. The extension portion 30B can cover the wearer's buttocks. On the other hand, the length of the ventral waistline portion 20 in the up-down direction is shorter than that of the dorsal waistline portion 30, and does not extend to the crotch side. Therefore, when walking, the leg movement to be lifted toward the ventral side is not hindered, and walking is easy.

[0087] In addition, an extension portion elastic member 35 is provided along the lower end of the extension portion 30B of the back waist portion 30. Like the waist elastic member 33, the extension portion elastic member 35 is fixed in an extended state between the inner layer sheet 31 and the outer layer sheet 32. The extension portion elastic member 35 allows the extension portion 30B to match the buttocks of the wearer, and the curling of the extension portion 30B can be suppressed. However, the configuration is not limited to the above. For example, the back waist portion 30 may be rectangular in a plan view like the ventral waist portion 20, and may not be provided with the extension elastic member 35.

[0088] Generally, when using a disposable diaper such as the diaper 1 of the present embodiment, the portion corresponding to the wearer's crotch (the crotch portion MA in the present embodiment) may be deformed in the absorbent body (absorbent core) due to external force from the thighs, etc., when or during wearing. In particular, in the case of a user with thick thighs, since the crotch width is small, there is a possibility that both sides of the absorbent core in the left and right directions are strongly pressed, compressing the width of the absorbent core and deforming the shape, or the absorbent core may be damaged due to friction of the thick thighs during wearing, which may become a cause of leakage.

[0089] In this regard, the diaper 1 of the present embodiment has a central position CL ( Figure 3 ) and the part corresponding to the wearer's crotch, namely the crotch portion MA ( Figure 2 ) has the following structure. Figure 5A 1 is a schematic cross-sectional view showing deformation of the absorbent core 11a during wear. Figure 5B Yes Figure 3 A magnified view of a portion of Figure 3 as well as Figure 5B As shown in FIG. 1 , the absorbent core 11a of the present embodiment has a central region 11aCV ( Figure 5B and the side regions 11aSV ( Figure 5BThe diaper 1 includes a plurality of central telescopic members 16 in the central portion of the crotch portion MA in the left-right direction, and the central region 11aCV has a portion overlapping the central telescopic members 16 when viewed in the thickness direction. Specifically, in the present embodiment, the positions of the central telescopic members 16e, 16e arranged at both ends in the left-right direction among the plurality of central telescopic members 16 arranged become the positions of the two ends in the left-right direction of the central region 11aCV. In other words, the positions of the central telescopic members 16e, 16e become the boundaries between the central region 11aCV and the side regions 11aSV in the left-right direction.

[0090] The central elastic member 16 is integrally bonded to the absorbent body 11 via the backsheet 13 by adhesive or the like, and the portion of the absorbent core 11a overlapping the central elastic member 16 shrinks in the longitudinal direction when viewed from above in the thickness direction, and is easily deformed so as to fit closely to the wearer. That is, the central region 11aCV is easily deformed toward the skin side (crotch side) by the central elastic member 16 (see Figure 5A ). In this way, the absorbent core 11a has a pair of guide portions 11G, 11G along the longitudinal direction at the boundary between the central region 11aCV and the side region aSV in the left-right direction. The absorbent core 11a is guided to deform toward the skin side in the thickness direction by the guide portions 11G, 11G, and the partial deformation of the central region 11aCV of the absorbent core 11a due to compression from the left-right direction when worn can be suppressed. In this embodiment, the pair of guide portions 11G, 11G refers to the portion of the central telescopic members 16e, 16e located at the two ends in the left-right direction among the multiple central telescopic members 16 arranged. In addition, when the central telescopic member 16 is, for example, a sheet of a predetermined size of elastic sheet, the two ends in the left-right direction of the elastic sheet become a pair of guide portions 11G, 11G, and when a plurality of rubber threads or elastic sheets in a strip shape are arranged, the outer ends in the left-right direction of the rubber threads or sheets located at the two ends in the left-right direction become a pair of guide portions 11G, 11G.

[0091] In addition, in the present embodiment, the portions of the central telescopic members 16e, 16e located at both ends in the left-right direction of the central telescopic member 16 are set as a pair of guide portions 11G, 11G, but the guide portion 11G is not limited to being formed by the outer ends in the left-right direction of the telescopic member, as long as it is a form that generates a rigidity difference in the absorbent core 11a. For example, the central region 11aCV may be formed by a low basis weight portion having a lower basis weight than the surroundings, and both ends in the left-right direction of the low basis weight portion may be defined as the guide portions 11G, 11G. Alternatively, in the present embodiment, the compressed portion 18 is provided in the entire region of the absorbent body 11, but, for example, the compressed portion may be provided in a manner that generates a rigidity difference between the central region 11aCV and the side regions 11aSV of the absorbent core 11a, and the portion where the rigidity difference is generated (that is, the boundary between the central region 11aCV and the side regions 11aSV) may be defined as the guide portion 11G.

[0092] In addition, in this embodiment, if Figure 5B As shown in FIG. 1 , at the center position CL in the longitudinal direction of the absorbent body 10, the length L1 of the central region 11aCV in the left-right direction is smaller than the length L2 of either of the side regions 11aSV located on both sides of the central region 11aCV in the left-right direction. By reducing the width (the length in the left-right direction) of the central region 11aCV, the central region 11aCV is less likely to be deformed by external forces from both sides in the left-right direction when or during the wearing of the diaper 1. Figure 5A as well as Figure 5B As shown in the figure, when the diaper 1 is worn, the pair of guide portions 11G, 11G are induced to deform so that the portion from the guide portion 11G to the end 11ae of the absorbent core 11a in the left-right direction (i.e., the side region 11aSV) faces the wearer's thigh. By promoting such deformation, the side region 11aSV is matched along the thigh, and the displacement of the absorbent core 11a caused by the friction of the wearer's thigh is suppressed, which can prevent leakage.

[0093] Furthermore, the length L2 of one of the side regions 11aSV in the left-right direction is preferably less than or equal to twice the length L1 of the central region 11aCV in the left-right direction. Compared with the case where the width (the length in the left-right direction) of the side region 11aSV exceeds twice the width of the central region 11aCV, when the width of the side region 11aSV is less than or equal to twice the width of the central region 11aCV, even if it is rubbed by thick thighs during wearing, it is difficult for the side region 11aSV to be twisted or deformed. In addition, it is preferred that the length L2 of the side region 11aSV in the left-right direction is less than or equal to 1.5 times the length L1 of the central region 11aCV. If the length of the side region 11aSV is too long, there is a possibility that it will become the starting point of further deformation of the absorbent core 11a, but by setting it not too long, it is easy to maintain a state matching the thigh.

[0094] The absorbent core 11a has liquid-absorbent fibers. In the present embodiment, in the absorbent core 11a, the region where the liquid-absorbent fibers exist is defined as the existence region 11ex, and the region where the liquid-absorbent fibers do not exist is defined as the non-existence region. In this case, the side region 11aSV is composed only of the existence region 11ex ( Figure 5B ) The side regions 11aSV have liquid-absorbent fibers throughout the entire region, so that the rigidity is increased, and even when the side regions 11aSV are rubbed by thick thighs during the wearing of the diaper 1, the shape of the absorbent core 11a can be suppressed.

[0095] In addition, as described above, the side regions 11aSV have improved rigidity because they do not have regions where the liquid-absorbent fibers do not exist, but the invention is not limited thereto. That is, at least the side regions 11aSV may have a mechanism for improving the rigidity of the absorbent core 11a. In the present embodiment, the side regions 11aSV further have a compression portion 18. By having the compression portion 18, the rigidity of the side regions 11aSV is improved, and the deformation of the side regions 11aSV caused by the friction of the thick thighs during wearing can be further suppressed.

[0096] The absorbent core 11a has a narrowed portion 11ac, and the central elastic member 16 is provided in the region where the narrowed portion 11ac exists in the longitudinal direction. The narrowed portion 11ac of the absorbent core 11a is a portion corresponding to the crotch portion when the diaper 1 is worn, and the longitudinal contraction of each central elastic member 16 provided in the region of the narrowed portion 11a can shorten the distance between the absorbent core 11a and the urination port at the narrowed portion 11a, thereby suppressing leakage.

[0097] In addition, if Figure 3 As shown in the figure, in the longitudinal direction, the length L3 from the end 16fe on the ventral side to the central position CL of the central telescopic member 16 is greater than the length L4 from the end 16be on the dorsal side to the central position CL. That is, the central telescopic member 16 is arranged so as to be biased toward the so-called ventral side in the longitudinal direction. By arranging the central telescopic member 16 biased toward the ventral side in this way, the distance between the central telescopic member 16 and the absorbent core 11a can be shortened according to the urination opening on the front side (ventral side) of the wearer by contraction, so that urine can be easily absorbed, thereby suppressing leakage.

[0098] In addition, if Figure 5BAs shown, in the absorbent body 10, at the central position CL and on one side in the left-right direction, the length L5 from the outer end 50ue to the inner end 50ie of the leakage-proof wall 50 on one side in the left-right direction is less than half of the length L6 from the outer end 50ue in the left-right direction of the leakage-proof wall 50 to the guide portion 11G on one side mentioned above. The leakage-proof wall 50 stands up when the diaper 1 is worn, but if the length of the leakage-proof wall 50 is long, there is a possibility that the absorption surface of the absorbent body 10 is covered by the leakage-proof wall 50. By configuring the length of the leakage-proof wall 50 in the left-right direction to be less than half of the length L6 from the outer end 50ue to the guide portion 11G as described above, the absorption surface of the absorbent body 10 is not covered, and leakage can be prevented.

[0099] In addition, if Figure 5B As shown, when the shortest portion in the left-right direction of the narrowed portion 11ac of the absorbent core 11a is set as the narrowest portion 11acp, the length L5 from the outer end 50ue to the inner end 50ie in the left-right direction of the leakage-proof wall portion 50 on one side at the central position CL is shorter than the left-right length L7 from the outer end 50ue of the leakage-proof wall portion 50 to the end 11acpe of the narrowest portion 11acp on the one side (L5<L7). By setting the width (length L5) of the leakage-proof wall portion 50 to a length that does not reach the narrowest portion acp of the absorbent core 11a even at the narrowest portion acp of the narrowed portion 11ac of the absorbent core 11a, the leakage-proof wall portion 50 does not cover the narrowest portion acp of the absorbent core 11a, and the absorbent core 11a can reliably perform the absorption function and prevent leakage.

[0100] In addition, in the present embodiment, the absorbent body 10 has a secondary sheet 15 disposed between the top sheet 12 and the absorbent core 11a, and the central region 11aCV is provided in the region where the secondary sheet 15 is provided in the left-right direction, and has a portion overlapping with the secondary sheet 15 when viewed in the thickness direction. Specifically, in the present embodiment, when viewed in the thickness direction, the entire region of the central region 11aCV is a portion overlapping with the secondary sheet 15. By providing the central region 11aCV in the region where the secondary sheet 15 is provided, the rigidity of the central region 11aCV becomes higher, and when Figure 5A When the diaper 1 is worn as shown and the central region 11aCV is deformed toward the skin side, the central region 11aCV is unlikely to be twisted and can easily fit the wearer's body.

[0101] In addition, the central region 11aCV has a portion overlapping with the central stretchable member 16 that stretches in the longitudinal direction when viewed in the thickness direction, but it is preferable that the central region 11aCV does not have a stretchable member that stretches in the left-right direction. If the absorbent core 11a stretches in the left-right direction, the absorbent core 11a is easily deformed, and therefore, it is preferable that the central region 11aCV does not have stretchability in the left-right direction.

[0102] ===Second Implementation Method===

[0103] Figure 6 This is a schematic plan view of a diaper 1 ′ in a developed and stretched state according to a second embodiment of the present invention as viewed from the skin side. Figure 7 It is a plan view explaining the structure of the absorbent body 10 according to the second embodiment. Figure 8 yes Figure 7 A schematic cross-sectional view taken along the BB line of FIG. Fig. 9 It is a schematic cross-sectional view showing deformation of the absorbent core 110 (111, 112) during wearing. In addition, the "expanded state" and "extended state" of the diaper 1' are the same as the expanded state and the extended state described in the first embodiment.

[0104] In the first embodiment, the absorbent body 10 of the diaper 1 has a single-layer absorbent core 11a, while in the second embodiment, the absorbent body 10 of the diaper 1' has a two-layer absorbent core 110, which is configured to have: a first absorbent core 111; and a second absorbent core 112 provided on the non-skin side in the thickness direction relative to the first absorbent core 111. In addition, in the second embodiment, both the first absorbent core 111 and the second absorbent core 112 are configured without a compression portion 18, but the second absorbent core 112 has a low basis weight portion (a low basis weight portion 112T described later) having a basis weight lower than that of the surroundings. The above aspects are mainly different from the first embodiment, and the other aspects are roughly the same, so the following mainly describes the difference, and the same reference numerals are marked for the same configuration and the description thereof is omitted.

[0105] <About the absorbent core 110>

[0106] like Figures 6 to 8As shown in the figure, the absorbent body 10 of the diaper 1' of the second embodiment has an absorbent core 110 of a two-layer structure. Specifically, the absorbent core 110 has: a first absorbent core 111 that absorbs and retains excretion fluid such as urine; and a second absorbent core 112 that is provided on the non-skin side in the thickness direction of the first absorbent core 111 and also absorbs and retains excretion fluid such as urine. In addition, the first absorbent core 111 is covered with a liquid-permeable core wrap sheet 111r. Specifically, the core wrap sheet 111r is wrapped in the left-right direction to cover the entire outer peripheral surface of the first absorbent core 111, but the present invention is not limited thereto.

[0107] The second absorbent core 112 is also covered by a liquid-permeable core wrap sheet 112r. Specifically, the core wrap sheet 112r is wrapped in the left-right direction like the first absorbent core 111, thereby covering the entire outer peripheral surface of the second absorbent core 112, but the present invention is not limited thereto. The liquid-absorbent material constituting the first absorbent core 111 and the second absorbent core 112 and the material constituting the core wrap sheets 111r and 112r are the same as the absorbent core 11a and the core wrap sheet 11b of the first embodiment.

[0108] And, if Figure 7 As shown, the second absorbent core 112 is formed by laminating liquid-absorbent materials in the thickness direction so that the shape is substantially hourglass-shaped when viewed from above. That is, the second absorbent core 112 has a narrowed portion 112ac between both ends in the longitudinal direction whose width in the left-right direction is smaller than that of both ends.

[0109] In addition, in the present embodiment, the second absorbent core 12 has a low basis weight portion 112T in which the second absorbent core 12 is hollowed out and extends in the longitudinal direction in the central portion in the left-right direction. In the present embodiment, the low basis weight portion 112T is set to be such that there is no second absorbent core 112 (i.e., the basis weight is set to zero), but it is not limited to this. Here, basis weight refers to the mass per unit area. In the present embodiment, the low basis weight portion 112T can be a portion with a basis weight smaller than the surrounding. By having the absorbent core 110 with the low basis weight portion 112T, the absorbent core 110 can be induced to deform with the crotch of the wearer with the low basis weight portion 112T as the starting point. In addition, when the wearer urinates, urine can be quickly diffused in the longitudinal direction along the low basis weight portion 112T. In addition, the number, configuration, shape, etc. of the low basis weight portion 112T are not limited to the configuration of the low basis weight portion 112T of the present embodiment.

[0110] In addition, if Figure 7 As shown in FIG. 1 , the central region 110CV located in the center of the absorbent core 110 in the left-right direction of the second embodiment is a range in which the low basis weight portion 112T described above exists in the left-right direction ( Figure 7The two outer sides of the central area 110CV in the left and right directions are the side areas 110SV ( Figure 7 In the second embodiment, a plurality of central telescopic members 16 are also provided in the central part of the absorbent body 10 in the left-right direction and the longitudinal direction, but the left-right ends 112Te, 112Te of the low basis weight portion 112T are located outside in the left-right direction compared to the positions of the left-right ends of the plurality of central telescopic members 16. Therefore, in the present embodiment, the portions of the two ends 112Te, 112Te extending in the longitudinal direction of the low basis weight portion 112T form a pair of guide portions 110G, 110G. In the second embodiment, the absorbent core 110 has a two-layer structure, and the central region 110CV and the side region 110SV in the present embodiment refer to regions including both the first absorbent core 111 and the second absorbent core 112.

[0111] As described above, the absorbent core 110 of this embodiment has a pair of guide portions 110G and 110G along the longitudinal direction at the boundary between the central region 110CV and the side region 110SV in the left-right direction, and the guide portions 110G and 110G are used as starting points, and the central telescopic member 16 is contracted in the longitudinal direction. Fig. 9 As shown in FIG. 1 , the central region 110CV is deformed toward the skin side in the thickness direction and closely adheres to the crotch of the wearer. Figure 7 As shown in FIG. 1 , also at the center position CL in the longitudinal direction of the absorbent body 10, the length L11 of the central region 110CV in the left-right direction is smaller than the length L12 of the side region 110SV in the left-right direction. By setting it in this way, even if it is worn by a wearer with thick thighs, the central region 110CV is unlikely to be deformed by compression from both sides in the left-right direction. Fig. 9 As shown, the induction portion 110G induces deformation when the diaper 1' is worn so that the side area 110SV faces the wearer's thighs and matches the thighs. Therefore, in the side area 110SV, the absorbent core 110 can be prevented from becoming wrinkled in the left and right directions due to friction with the wearer's thick thighs.

[0112] In addition, if Figure 8 As shown in FIG. 1 , when viewed in the thickness direction, the side region 110SV has an overlapping region 110vp where the first absorbent core 111 and the second absorbent core 112 overlap. In the side region 110SV, the overlapping region 110vp ( Figure 7 The rigidity of the area (indicated by thick dots) is improved, which can suppress the deformation of the absorbent core 110 caused by friction of thick thighs.

[0113] As described above, in this embodiment, the second absorbent core 112 has a narrowed portion 112ac, and the side region 110SV is provided in the region provided with the narrowed portion 112ac in the longitudinal direction. Figure 7 ) is larger than the portion 110ee ( Figure 7 ) is a high-rigidity portion with high rigidity.

[0114] As the rigidity values ​​of the overlapping region 110vp and the portion 110ee excluding the narrowed portion 112ac, for example, a value obtained by dividing the value measured by the Gurley stiffness by the length of the sample sheet can be exemplified. The Gurley stiffness can be measured, for example, using a Gurley softness tester No. 311 manufactured by Yasuda Seiki Seisakusho Co., Ltd. in accordance with JIS-L1096. In addition, in the present embodiment, it is sufficient to confirm the magnitude relationship between the rigidity of the overlapping region 110vp and the portion 110ee, and therefore, it is not necessary to obtain a precise value, and a certain degree of error in the measured value is also acceptable.

[0115] The narrowing portion 112ac is a portion corresponding to the wearer's crotch. When the diaper 1' is worn, the side region 110SV provided in the narrowing portion 112ac is a portion that often rubs against the thick thighs of the wearer. Since the overlapping region 110vp of the side region 110SV has high rigidity, the shape of the absorbent core 110 caused by the friction of the thick thighs can be prevented. In addition, in this embodiment, the second absorbent core 112 has the narrowing portion 112ac, but it is sufficient that at least one of the first absorbent core 111 and the second absorbent core 112 has the narrowing portion.

[0116] In addition, in this embodiment, the first absorbent core 111 is also provided in the region where the narrowing portion 112ac is provided in the longitudinal direction. The narrowing portion 112ac is a portion that is easily deformed by external forces from the left and right directions during wear. By providing the first absorbent core 111 in the region of the narrowing portion 112ac, the rigidity is increased in the narrowing portion 112ac, and the absorbent core 110 is difficult to deform.

[0117] In addition, if Figure 7 As shown in the figure, in the left-right direction of the side region 110SV, the outer end 111e of the first absorbent core 111 is located outside compared to the outer end 112e of the second absorbent core 112. That is, the width (length in the left-right direction) of the first absorbent core 111 located on the skin side is greater than the width of the second absorbent core 112 located on the non-skin side. According to such a configuration, the surface of the first absorbent core 111 on the side close to the wearer's skin can be reliably attached to the thigh, and leakage is unlikely to occur.

[0118] In addition, as described above, in the present embodiment, the low basis weight portion 112T is provided in the second absorbent core 112 in the central region 110CV. The central region 110CV is induced to deform convexly toward the skin side when the diaper 1' is worn, and the low basis weight portion 112T becomes the deformation starting point. Due to the presence of the low basis weight portion 112T, the central region 110CV is easily deformed convexly toward the skin side. In addition, in the present embodiment, the low basis weight portion 112T is provided in the second absorbent core 112, but it is not limited thereto, and it is sufficient as long as it is provided in at least one of the first absorbent core 111 and the second absorbent core 112.

[0119] In addition, if Figure 6 As shown in FIG. 1 , at the center position CL, the length L13 of the first absorbent core 111 in the left-right direction is greater than the length L14 of the second absorbent core 112 in the left-right direction. That is, at the center position CL, the width (length in the left-right direction) of the first absorbent core 111 is greater than the width of the second absorbent core 112. Figure 7 As shown, when the length of the central region 110CV in the left-right direction is set to the length L1, the length L15 from the left-right outer end 111e of the first absorbent core 111 to the left-right outer end 112e of the second absorbent core 112 at the central position CL and on one side in the left-right direction is shorter than the above-mentioned length L1. The above-mentioned length L15 is the width difference between the first absorbent core 111 and the second absorbent core 112 at the so-called central position CL, and by making the width difference (L15) between the first absorbent core 111 and the second absorbent core 112 shorter than the length L1, in the absorbent core 110, the second absorbent core 112 also extends to the vicinity of the end in the left-right direction, and the rigidity is also maintained at the end in the left-right direction of the absorbent core 110, and the absorbent core 110 is easily kept in a planar shape during wear. As a result, side leakage and the like can be suppressed.

[0120] In addition, return Figure 6 In this embodiment, in the longitudinal direction, the first absorbent core 111 is arranged at a position away from the waist elastic members 23 and 33 provided at the waist portions 20 and 30, and the second absorbent core 112 has a portion overlapping with the waist elastic members 23 and 33. In this embodiment, since the absorbent core 110 has the first absorbent core 111 and the second absorbent core 112, the rigidity of the absorbent core 110 is improved. However, if the two layers of absorbent cores (111 and 112) exist even in the region where the waist elastic members 23 and 33 are provided, a stiff feeling may be generated when the diaper 1' is made to fit closely to the waist. Since the waist portions 20 and 30 are also far from the crotch, and do not require absorption performance like the crotch, by configuring the second absorbent core 112 to have an overlapping portion, the stiff feeling can be reduced and leakage can be prevented.

[0121] ===Others===

[0122] The purpose of the above embodiments is to facilitate the understanding of the present invention, and the present invention is not to be interpreted as being limitative. The present invention can be changed and improved without departing from its concept, and the present invention naturally includes its equivalent configuration.

[0123] Description of Reference Numerals

[0124] 1 Diapers (absorbent articles)

[0125] 10 Absorbent body

[0126] 11 Absorber

[0127] 11a Absorbent core

[0128] 11ac narrowing

[0129] 11acp narrowest part

[0130] 11acpe end

[0131] 11aCV Central Region

[0132] 11ae End

[0133] 11aSV lateral region

[0134] 11b Core wrap sheet

[0135] 11ex Existing Area

[0136] 11G Induction

[0137] 12 Top sheet

[0138] 13 Negative

[0139] 14 Sheet Components

[0140] 15. Sub-film

[0141] 16 Central telescopic member

[0142] 16be end

[0143] 16e Central telescopic member

[0144] 16fe end

[0145] 18 Compression

[0146] 20 Ventral waist circumference (waist circumference)

[0147] 21 Inner sheet

[0148] 22 outer slices

[0149] 23 Waist elastic member

[0150] 30 Back waist area (waist area)

[0151] 30A Overlap

[0152] 30B Extension

[0153] 31 inner layer

[0154] 32 outer slices

[0155] 33 Waist elastic member

[0156] 35 extension elastic member

[0157] 40 Waistline joint

[0158] 50 Leak-proof wall

[0159] 50A joint

[0160] 50B Fulcrum

[0161] 50E Fulcrum

[0162] 50ie inner end

[0163] 50ue outer end

[0164] 51 Leakage-proof wall elastic component

[0165] 110 Absorbent core

[0166] 110CV Central Area

[0167] 110ee part

[0168] 110SV Side area

[0169] 110vp Overlap Area

[0170] 111 No. 1 absorbent core

[0171] 111e External

[0172] 111r core coating sheet

[0173] 112 Second absorbent core

[0174] 112ac Narrowing

[0175] 112e Outer end

[0176] 112r core coating sheet

[0177] 112T Low Basis Weight

Claims

1. An absorbent article, which has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other in an unfolded and stretched state, and which has an absorbent body having an absorbent core, characterized in that: The absorbent core has, at a crotch portion that straddles the center of the longitudinal direction of the absorbent body, a central region located in the center of the left-right direction, and side regions located on both outer sides of the central region in the left-right direction. The absorbent core has a pair of guide portions along the longitudinal direction at the boundary between the central region and the side region in the left-right direction. At the central position, the length of the central area in the left-right direction is smaller than the length of any one of the side areas located at the two outer sides in the left-right direction. The guide portion is induced to deform when the absorbent article is worn so that a portion from the guide portion to the end portion of the absorbent core in the left-right direction faces the thigh of the wearer.

2. An absorbent article, which has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other in an unfolded and stretched state, and which has an absorbent body having an absorbent core, characterized in that: The absorbent core has, at a crotch portion that straddles the center of the longitudinal direction of the absorbent body, a central region located in the center of the left-right direction, and side regions located on both outer sides of the central region in the left-right direction. The absorbent core has a pair of guide portions along the longitudinal direction at the boundary between the central region and the side region in the left-right direction. At the central position, the length of the central area in the left-right direction is smaller than the length of any one of the side areas located at the two outer sides in the left-right direction. A length of one of the side regions in the left-right direction is not more than twice a length of the central region in the left-right direction.

3. An absorbent article, which has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other in an unfolded and stretched state, and which has an absorbent body having an absorbent core, characterized in that: The absorbent core has, at a crotch portion that straddles the center of the longitudinal direction of the absorbent body, a central region located in the center of the left-right direction, and side regions located on both outer sides of the central region in the left-right direction. The absorbent core has a pair of guide portions along the longitudinal direction at the boundary between the central region and the side region in the left-right direction. At the central position, the length of the central area in the left-right direction is smaller than the length of any one of the side areas located at the two outer sides in the left-right direction. The absorbent core has liquid-absorbent fibers. In the absorbent core, when the region where the liquid-absorbent fibers are present is defined as the presence region and the region where the liquid-absorbent fibers are not present is defined as the non-presence region, The side area is composed only of the existing area.

4. The absorbent article according to any one of claims 1 to 3, wherein: At least the side regions have a mechanism for improving the rigidity of the absorbent core.

5. The absorbent article according to any one of claims 1 to 3, wherein: The side region has a compressed portion.

6. The absorbent article according to any one of claims 1 to 3, wherein: A central stretchable member that is stretchable in the longitudinal direction is provided at the central portion of the crotch portion in the left-right direction. The central region has a portion overlapping with the central telescopic member when viewed in the thickness direction.

7. The absorbent article according to claim 6, wherein: The absorbent core has a narrowed portion between the two ends in the longitudinal direction, the width of which is smaller in the left-right direction than that of the two ends. The central telescopic member is provided in a region where the narrowed portion exists in the longitudinal direction.

8. The absorbent article according to claim 6, wherein When one side in the longitudinal direction is defined as the wearer's ventral side and the other side in the longitudinal direction is defined as the wearer's back side, The central telescopic member has a length from the ventral end to the central position in the longitudinal direction that is greater than a length from the dorsal end to the central position.

9. The absorbent article according to any one of claims 1 to 3, wherein: The absorbent core includes a first absorbent core and a second absorbent core provided on the non-skin side in the thickness direction relative to the first absorbent core. The side region has an overlapping region where the first absorbent core and the second absorbent core overlap when viewed in the thickness direction.

10. The absorbent article according to claim 9, wherein At least one of the first absorbent core and the second absorbent core has a narrowed portion between the two ends in the longitudinal direction whose width in the left-right direction is smaller than that of the two ends. The lateral region is provided in the region where the narrowing portion is provided in the longitudinal direction. The rigidity of the overlapping region in the side region is greater than the rigidity of a portion other than the narrowed portion.

11. The absorbent article according to claim 9, wherein In the left-right direction of the side region, the outer end of the first absorbent core is located outside the outer end of the second absorbent core.

12. The absorbent article according to claim 9, wherein The second absorbent core has a narrowed portion between the two ends in the longitudinal direction, the narrowed portion having a width in the left-right direction smaller than that of the two ends. The first absorbent core is provided in a region where the narrowed portion is provided in the longitudinal direction.

13. The absorbent article according to claim 9, wherein In the central region, a low basis weight portion having a basis weight lower than that of the surroundings is provided in at least one of the first absorbent core and the second absorbent core.

14. The absorbent article according to claim 9, wherein At the central position, the length of the first absorbent core in the left-right direction is greater than the length of the second absorbent core in the left-right direction. When the length of the central area in the left-right direction is defined as length L1, At the central position and on one side in the left-right direction, the length from the left-right outer end of the first absorbent core on one side to the left-right outer end of the second absorbent core on one side is shorter than the length L1.

15. The absorbent article according to any one of claims 1 to 3, wherein: The absorbent article has a pair of leakage-proof walls, which are provided with elastic members that can shrink in the longitudinal direction and are disposed on both sides of the absorbent body in the left-right direction. At the central position and on one side in the left-right direction, the length from the outer end to the inner end of the leakage-proof wall portion on one side in the left-right direction is less than half of the length from the outer end to the induction portion on one side in the left-right direction.

16. The absorbent article according to claim 15, wherein The absorbent core has a narrowed portion between the two ends in the longitudinal direction, the width of which is smaller in the left-right direction than that of the two ends. When the portion of the narrowed portion having the shortest length in the left-right direction is defined as the narrowest portion, At the central position and on one side in the left-right direction, the length from the outer end to the inner end of the leakage-proof wall portion on one side in the left-right direction is smaller than the length from the outer end to the end of the narrowest portion on one side in the left-right direction.

17. The absorbent article according to any one of claims 1 to 3, wherein: The absorbent body comprises: a top sheet disposed on the skin side in the thickness direction relative to the absorbent core; and a secondary sheet disposed between the top sheet and the absorbent core. The central region is provided in a region where the second sheet is provided in the left-right direction, and has a portion overlapping with the second sheet when viewed in the thickness direction.

18. The absorbent article according to any one of claims 1 to 3, wherein: The absorbent article has a waist portion, the waist portion having a waist elastic member that is stretchable in the left-right direction and is arranged around the waist of the wearer. The absorbent core includes a first absorbent core and a second absorbent core provided on the non-skin side in the thickness direction relative to the first absorbent core. The first absorbent core is disposed at a position away from the waist elastic member in the longitudinal direction, and the second absorbent core has a portion overlapping the waist elastic member.

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