Underpants-type sanitary napkin

Abstract

Provided is an underpants-type sanitary napkin which has high adhesion to both sides in the left-right direction and an excretion opening. An underpants-type sanitary napkin (1) having an absorbent main body (10) provided with an absorbent core (11) and a waist member (20), in which a plurality of elastic members (50) that expand and contract in the vertical direction are provided at predetermined intervals in the left-right direction at positions closer to the non-skin side than the absorbent core (11). The elastic member (50) has, on both sides in the left-right direction, a first elastic member (51) disposed on the outermost side, and a second elastic member (52) disposed on the inner side of the first elastic member (51) so as to be adjacent to the first elastic member (51). The absorbent body (10) has a high-density portion (40) in which the density of the absorbent core (11) is higher than the density of the surrounding portion at least in a region located between the first elastic member (51) and the second elastic member (52) in the left-right direction.

Description

[0001] This application is a divisional application of an application with the application number 202010620335.9, the application date of June 30, 2020, and the invention name of “Panty-type sanitary napkin”. TECHNICAL FIELD

[0002] The present application relates to a panty-type sanitary napkin. BACKGROUND

[0003] In the past, disposable diapers, sanitary napkins, and the like absorbent articles having an absorbent main body with liquid absorption properties are known. In such absorbent articles, by arranging an elastic member having stretchability along the longitudinal direction of the absorbent main body, the fit of the absorbent main body when worn can be improved. For example, in Patent Literature 1, a technology is disclosed in which by arranging a plurality of crotch elastic members 17 along the longitudinal direction of the absorbent main body 3, the absorbent main body 3 is lifted upward (toward the skin side of the wearer) by the contraction force of the crotch elastic members 17, and the fit of the lower crotch portion of the wearer is improved.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2004-350809 SUMMARY

[0007] Problems to be Solved by the Invention

[0008] In the absorbent article of Patent Literature 1, in the region where the elastic members (crotch elastic members 17) are arranged, the absorbent main body can be brought into close contact with the lower crotch portion (vaginal opening or the like) of the wearer, but in the portions on both sides of the absorbent article in the left-right direction where no elastic members are arranged, the absorbent main body can not be brought into close contact with the skin of the wearer. Therefore, it is possible that the excreted liquid such as menstrual blood having a high viscosity leaks (side leakage occurs) toward the lateral side of the absorbent main body along the skin (e.g., the legs) of the wearer.

[0009] The present application was completed in view of the above-described problems, and aims to provide a panty-type sanitary napkin having a high fit on both sides in the left-right direction of the excretory opening.

[0010] Means for Solving the Problems

[0011] The main invention for achieving the above object is a panty-type sanitary napkin having upper and lower, left and right, and front and rear directions intersecting with each other, the panty-type sanitary napkin having: an absorbent main body having an absorbent core having a liquid absorbency; and a waist member disposed in superposition on a non-skin side of the absorbent main body, characterized in that a plurality of elastic members extending in the upper and lower direction are provided at predetermined intervals in the left and right direction at a position on the non-skin side of the absorbent core of the absorbent main body, the elastic members each have a first elastic member disposed on the outermost side and a second elastic member disposed on the inner side of the first elastic member adjacent to the first elastic member on both sides in the left and right direction, and the absorbent main body has a high-density portion having a higher density than the surrounding portion of the absorbent core at least in the region between the first elastic member and the second elastic member in the left and right direction.

[0012] Other features of the present invention will be apparent from the description and drawings.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to provide a panty-type sanitary napkin having higher fit on both sides in the left and right direction and at the discharge port. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a schematic perspective view of a sanitary napkin 1.

[0016] FIG. 2 is a plan view of the sanitary napkin 1 in an unfolded and elongated state as viewed from the skin side in the thickness direction.

[0017] FIG. 3 is a schematic view of FIG. 2 is a schematic view of the A-A cross-sectional view of

[0018] FIG. 4 is a plan view and a cross-sectional view of an absorbent main body 10.

[0019] FIG. 5A is a view illustrating the fit when wearing a sanitary napkin of the related art. FIG. 5B is a view illustrating the fit when wearing the sanitary napkin 1 of the present embodiment.

[0020] FIG. 6A to FIG. 6C is a view illustrating a sheet joint portion 60 in which the non-skin side sheet 21 of the waist member 20 is joined to the skin side sheets 22 and 23.

[0021] FIG. 7 is a view illustrating a bottom joint portion 70 in which the bottom sheet 14 and the side sheet 15 are joined in the absorbent main body 10.

[0022] FIG. 8 is a view illustrating a main body joining portion 80 for mounting and joining the absorbent main body 10 to the waist member 20.

[0023] Explanation of Reference Numerals

[0024] 1: sanitary napkin (panty-type sanitary napkin, absorbent article), 1a: waist opening, 1b: leg opening, 10: absorbent main body, 11: absorbent core, 12: topsheet, 13: second sheet, 14: backsheet, 15: side sheet, 15t: end portion, 20: waist member, 20f: front waist member, 20fe: end portion, 20b: back waist member, 20be: end portion, 20we: side joining portion, 21: non-skin side sheet, 22: skin side sheet, 23: skin side sheet, 25: waist elastic member, 30: leakage barrier portion, 31: leakage barrier elastic member, 32f: front joining portion, 32b: back joining portion, 40: high density portion, 41: first high density portion, 42: second high density portion, 42r1: reverse portion, 42r2: reverse portion, 43: third high density portion, 43c: back-side protrusion, 50: absorbent body elastic member, 51: first elastic member, 52: second elastic member, 53: third elastic member, 60: sheet joining portion, 61: first sheet joining portion, 62: second sheet joining portion, 70: back joining portion, 80: main body joining portion, 100: absorbent main body (comparative example), CL: center line (folding line). DETAILED DESCRIPTION

[0025] According to the description and the accompanying drawings, at least the following matters can be clarified.

[0026] A panty-type sanitary napkin having an up-and-down direction, a left-and-right direction, and a front-and-back direction crossing each other, the panty-type sanitary napkin having: an absorbent main body provided with an absorbent core having a liquid absorbency; and a waist member disposed overlappingly on a non-skin side of the absorbent main body, characterized in that a plurality of elastic members extending in the up-and-down direction are provided at a predetermined interval apart in the left-and-right direction at a position on the non-skin side of the absorbent core of the absorbent main body, the elastic members each having a first elastic member disposed on an outermost side and a second elastic member disposed on an inner side of the first elastic member adjacent to the first elastic member on both sides in the left-and-right direction, and the absorbent main body has a high density portion having a higher density than that of a surrounding portion of the absorbent core at least in a region between the first elastic member and the second elastic member in the left-and-right direction.

[0027] According to such a panty-type sanitary napkin, the leftward and rightward direction central portions of the absorbent core in which the second elastic members are arranged and the leftward and rightward direction side portions in which the first elastic members are arranged are respectively raised toward the lower crotch side of the wearer with the high-density portions as the bending starting points, and come into close contact with the skin of the wearer. Thus, the fit of the absorbent main body is improved at the discharge port (vaginal orifice) of the leftward and rightward direction central portions and the groin portions of the leftward and rightward direction side portions in the lower crotch portion of the wearer, and leakage of the discharged liquid such as menstrual blood can be prevented.

[0028] Further, it is clear that a panty-type sanitary napkin having upper and lower, leftward and rightward, and front and rear directions intersecting with each other, the panty-type sanitary napkin having: an absorbent main body provided with an absorbent core having liquid absorbency; and a waist member arranged so as to overlap the non-skin side of the absorbent main body, characterized in that a plurality of elastic members that stretch and contract along the upper and lower directions are provided at predetermined intervals in the leftward and rightward directions at positions on the non-skin side of the absorbent core of the absorbent main body, the elastic members each have, on both sides in the leftward and rightward directions, a first elastic member arranged at the outermost side and a second elastic member arranged on the inner side of the first elastic member adjacent to the first elastic member, the absorbent main body has, on both sides in the leftward and rightward directions, high-density portions in which the density of the absorbent core is higher than that of the surrounding portions, and regions in the absorbent main body in which the first elastic members are arranged and regions in which the second elastic members are arranged each have a shape that bulges toward the skin side of the wearer when viewed in the front and rear directions.

[0029] According to such a panty-type sanitary napkin, the leftward and rightward direction central portions of the absorbent core in which the second elastic members are arranged and the leftward and rightward direction side portions in which the first elastic members are arranged are respectively raised toward the lower crotch side of the wearer with the high-density portions as the bending starting points, and come into close contact with the skin of the wearer. Thus, the fit of the absorbent main body is improved at the discharge port (vaginal orifice) of the leftward and rightward direction central portions and the groin portions of the leftward and rightward direction side portions in the lower crotch portion of the wearer, and leakage of the discharged liquid such as menstrual blood can be prevented.

[0030] As the panty-type sanitary napkin, it is desirable that the panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half in the front and rear directions, and the length of a portion in which the contraction force generated by the elastic members acts at a position on the rear side of the folding line is longer than the length of a portion in which the contraction force generated by the elastic members acts at a position on the front side of the folding line.

[0031] According to such a panty-type sanitary napkin, the contraction force acting at a position on the rear side (dorsal side) of the folding line is larger than the contraction force acting at a position on the front side (ventral side), and the absorbent main body is more easily fitted to the dorsal side (hip side) of the wearer. Thus, it is possible to effectively prevent the menstrual blood or the like discharged from the discharge port from moving along the hip of the wearer toward the diagonal rear side and leaking to the outside of the panty-type sanitary napkin.

[0032] As the panty-type sanitary napkin, it is desirable that a pair of leakage preventing wall portions provided on both sides in the left-right direction of the absorbent main body have leakage preventing wall elastic members that stretch in the up-down direction, and at least in a position on a rear side from the folding line, a length of a portion on which a contracting force generated by the elastic members acts is longer than a length of a portion on which a contracting force generated by the leakage preventing wall elastic members acts.

[0033] According to such a panty-type sanitary napkin, the contracting force of the elastic members acting on the back side (hip side) of the wearer is higher than the contracting force of the leakage preventing wall elastic members, so it is easy to bring the absorbent core into close contact with the skin of the wearer, and it is possible to inhibit the leakage preventing wall portions from standing up too high toward the skin side of the wearer. Thus, when the panty-type sanitary napkin is worn, it is possible to inhibit a gap (space) from being formed between the hip of the wearer and the absorbent core, and to make it difficult for the exudate to leak.

[0034] As the panty-type sanitary napkin, it is desirable that the high density portion has a rear side protruding portion that protrudes from the outside in the left-right direction toward the inside and from the lower side in the up-down direction toward the upper side in an upper end portion on a rear side from the folding line, and the first elastic members are located on a position on the outside in the left-right direction from an outside end of the rear side protruding portion.

[0035] According to such a panty-type sanitary napkin, in the portion provided with the rear side protruding portion that extends obliquely, it is easy to inhibit the three-dimensional deformation of the absorbent core. In addition, the both sides of the rear side protruding portion are stretched by the first elastic members, so it is possible to make the absorbent core fit to the sacral region (hip) of the wearer in a state in which the rear end region of the absorbent core is maintained in a planar shape.

[0036] As the panty-type sanitary napkin, it is desirable that the waist member has at least a skin side sheet and a non-skin side sheet that is laminated to the non-skin side of the skin side sheet, the panty-type sanitary napkin has sheet joint portions that join the skin side sheet and the non-skin side sheet, and in a region in which the absorbent main body and the waist member overlap when viewed in the thickness direction, the total area of the sheet joint portions formed per unit area in a region on the inside in the left-right direction from the high density portion is smaller than the total area of the sheet joint portions formed per unit area in a region on the outside in the left-right direction from the high density portion.

[0037] According to such a panty-type sanitary napkin, by increasing the area ratio of the joint portion in regions further outward in the left-right direction than the pair of high-density portions, the stretch stress can be reduced, and the width of the absorbent main body in the left-right direction can be easily ensured. On the other hand, by decreasing the area ratio of the joint portion in regions further inward in the left-right direction than the high-density portions, the stretch force of the waist member can be effectively utilized, and the absorbent main body can be easily fitted to the cleft of the buttocks of the wearer. Thus, even in the case where the wearer moves the legs, the good fit of the sanitary napkin can be easily maintained, and the leakage of menstrual blood by transmission to the skin can be suppressed.

[0038] As the panty-type sanitary napkin, it is desirable that, in a region where the absorbent main body overlaps the waist member when viewed in the thickness direction and is inward in the left-right direction than the high-density portions, the total area of the sheet joint portions per unit area formed in a region further rearward than the fold line when the panty-type sanitary napkin is folded in the front-rear direction is smaller than the total area of the sheet joint portions per unit area formed in a region further forward than the fold line.

[0039] According to such a panty-type sanitary napkin, the rigidity of the front side of the waist member is increased compared to the rear side when worn. Thus, when the wearer uses the sanitary napkin in a lying posture at night, even if the wearer performs an action such as turning over, the absorbent main body is easily maintained in a deformed shape on the front side (ventral side). On the other hand, by decreasing the rigidity on the rear side (dorsal side) of the waist member, the stretch in the longitudinal direction (up-down direction) of the absorbent body elastic member is not easily hindered, and thus the absorbent main body is easily fitted along the cleft of the buttocks. In addition, the waist member is also easily contracted in the left-right direction, and thus even if the wearer performs an action such as turning over, the fit to the buttocks is easily maintained.

[0040] As the panty-type sanitary napkin, it is desirable that the absorbent main body has a liquid-impermeable back sheet disposed at a position further non-skin side than the absorbent core and a side sheet laminated to the non-skin side of the back sheet, the panty-type sanitary napkin has a back joint portion joining the back sheet and the side sheet, and in the left-right direction, has a third elastic member disposed inward of the second elastic member adjacent to the second elastic member, and the total area of the back joint portion per unit area formed in a region between the first elastic member and the second elastic member is greater than the total area of the back joint portion per unit area formed in a region between the second elastic member and the third elastic member.

[0041] According to such a panty-type sanitary napkin, the joint strength of the backsheet and the side sheet is increased in the region between the first elastic member and the second elastic member, and the rigidity of the absorbent main body can be increased. Thus, in this region, it is easy for the absorbent main body (absorbent core) to form a habitual bend, and in the case where the absorbent core is deformed with a bulge, it is easy to maintain the shape. Thus, it is easy to maintain the state in which the absorbent main body is fitted to the crotch portion of the wearer, the absorbency of menstrual blood and the like can be increased, and leakage can be easily suppressed.

[0042] As the panty-type sanitary napkin, it is desirable that the waist member has a front waist member and a rear waist member, has a side joint portion that mutually joins the front waist member and the rear waist member at both end portions in the left-right direction, and the position of the lower end of the side joint portion is higher than the position of the upper end of the first elastic member at a position that is more frontward than the folding line when the panty-type sanitary napkin is folded in the front-rear direction.

[0043] According to such a panty-type sanitary napkin, even if the front waist member is deformed in correspondence with the movement of the body (ventral side) of the wearer when worn, the influence of this deformation is difficult to propagate to the absorbent body elastic member. Thus, the positional displacement of the absorbent main body in correspondence with the movement of the front waist member is suppressed, and it is easy to maintain the good fit of the absorbent main body.

[0044] As the panty-type sanitary napkin, it is desirable that the panty-type sanitary napkin has a main body joint portion that joins the absorbent main body to the skin side of the waist portion, and the interval of the pair of first elastic members is larger than 1 / 2 of the width of the absorbent core and smaller than the width of the main body joint portion in the left-right direction.

[0045] According to such a panty-type sanitary napkin, by making the interval of the first elastic member smaller than the width of the main body joint portion, it is difficult for the elastic force generated by the first elastic member to act on the standing start point of the leakage prevention wall portion (the outer side end of the main body joint portion), and the standing of the leakage prevention wall portion is difficult to be hindered. In addition, by making the interval of the first elastic member larger than 1 / 2 of the width of the absorbent core, it is possible to suppress the situation in which the central portion in the left-right direction of the absorbent core becomes too narrow to be deformed with a bulge and difficult to fit to the discharge opening.

[0046] As the panty-type sanitary napkin, it is desirable that the width of the upper end portion of the main body joint portion in the up-down direction is larger than the width of the lower end portion of the main body joint portion in the up-down direction.

[0047] According to such a panty-type sanitary napkin, at the upper end portion in the up-and-down direction, the absorbent main body is joined to the waist member over a large area, and the absorbent main body is difficult to twist or deform, and the absorbent main body easily flatly adheres to the wearer's body over a large area. On the other hand, at the lower end portion (crotch portion) in the up-and-down direction, the portion where the absorbent main body is joined to the waist member is narrow, and thus the absorbent main body easily deforms, and it is possible to suppress the occurrence of an unpleasant feeling or the like in which the side edge portions of the absorbent main body press against the wearer's groin portion.

[0048] As the panty-type sanitary napkin, it is desirable that the panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half along the front-and-rear direction, and does not have a portion in which the high-density portion overlaps the folding line.

[0049] According to such a panty-type sanitary napkin, the high-density portion is discontinuous across the folding line, and thus when the panty-type sanitary napkin is worn, the absorbent main body easily deforms independently in the respective regions of the abdominal side and the back side. That is, the abdominal side and the back side of the absorbent main body easily follow the movements of the wearer's body, and it is possible to further improve the adhesiveness. Thus, it is possible to easily suppress the leakage of menstrual blood or the like.

[0050] As the panty-type sanitary napkin, it is desirable that the high-density portion has a reverse portion in which a part of the region reverses to the opposite side in the up-and-down direction, and the reverse portion has a portion that intersects the first elastic member.

[0051] According to such a panty-type sanitary napkin, at the portion where the reverse portion intersects the first elastic member, the contraction force generated by the first elastic member is difficult to act on the absorbent core under the influence of the reverse portion. Thus, by adjusting the arrangement of the reverse portion, it is possible to locally control the deformation of the absorbent core. Thus, it is possible to easily cause the absorbent core to adhere to the wearer's body.

[0052] == Embodiment ==

[0053] As an example of the absorbent article according to the embodiment of the present application, a panty-type sanitary napkin 1 (hereinafter, also simply referred to as "sanitary napkin 1") is described.

[0054] <Basic configuration of sanitary napkin 1>

[0055] FIG. 1 is a schematic perspective view of the sanitary napkin 1 according to the present embodiment. FIG. 2 is a plan view of the sanitary napkin 1 in an unfolded and elongated state as viewed from the skin side in the thickness direction. FIG. 3 is a schematic cross-sectional view of FIG. 2 A-A.

[0056] In addition, the "extended state" of the sanitary napkin 1 refers to a state in which the sanitary napkin 1 as a whole (the product as a whole) is extended to a state free of wrinkles by extending each elastic member (for example, the absorbent body elastic member 50, the skin-side sheets 22, 23, and the like described later) possessed by the sanitary napkin 1, specifically, to a state in which the dimensions of each member (for example, the non-skin-side sheet 21 and the skin-side sheets 22, 23, and the like described later) constituting the sanitary napkin 1 become dimensions identical to or close to the dimensions of the member alone.

[0057] As shown in FIG. 1, the sanitary napkin 1 has an "up-down direction", a "left-right direction", and a "front-rear direction" orthogonal to one another. FIG. 1 As shown in FIG. 1, the sanitary napkin 1 has an "up-down direction", a "left-right direction", and a "front-rear direction" orthogonal to one another. FIG. 3 As shown in FIG. 1, the sanitary napkin 1 has an "up-down direction", a "left-right direction", and a "front-rear direction" orthogonal to one another.

[0058] In addition, the sanitary napkin 1 has a "lengthwise direction" and a "widthwise direction" orthogonal to one another in the unfolded state shown in FIG. 1. The "lengthwise direction" is a direction along the up-down direction of the panty type, and the "widthwise direction" is a direction along the left-right direction of the panty type. FIG. 2 In addition, the sanitary napkin 1 has a "lengthwise direction" and a "widthwise direction" orthogonal to one another in the unfolded state shown in FIG. 1. The "lengthwise direction" is a direction along the up-down direction of the panty type, and the "widthwise direction" is a direction along the left-right direction of the panty type.

[0059] The sanitary napkin 1 of the present embodiment includes an absorbent body 10 for absorbing liquid such as menstrual blood, and a waist member 20 disposed on the non-skin side of the absorbent body 10 and on the waist of the wearer when the sanitary napkin 1 is worn.

[0060] (Absorbent Body 10)

[0061] FIG. 4 is a plan view and a sectional view of the absorbent body 10. As shown in FIG. 2, the absorbent body 10 of the present embodiment is a planar substantially oblong shape in which the lengthwise direction (i.e., the longitudinal direction of the absorbent body 10) is along the up-down direction of the sanitary napkin 1. In addition, as shown in FIG. 2 and FIG. 3, the absorbent body 10 has an absorbent core 11 along the lengthwise direction (up-down direction), a top sheet 12 disposed at a position closer to the skin side than the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a bottom sheet 14 disposed at a position closer to the non-skin side than the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the bottom sheet 14. FIG. 2 is a plan view and a sectional view of the absorbent body 10. As shown in FIG. 2, the absorbent body 10 of the present embodiment is a planar substantially oblong shape in which the lengthwise direction (i.e., the longitudinal direction of the absorbent body 10) is along the up-down direction of the sanitary napkin 1. In addition, as shown in FIG. 2 and FIG. 3, the absorbent body 10 has an absorbent core 11 along the lengthwise direction (up-down direction), a top sheet 12 disposed at a position closer to the skin side than the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a bottom sheet 14 disposed at a position closer to the non-skin side than the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the bottom sheet 14. FIG. 3 is a plan view and a sectional view of the absorbent body 10. As shown in FIG. 2, the absorbent body 10 of the present embodiment is a planar substantially oblong shape in which the lengthwise direction (i.e., the longitudinal direction of the absorbent body 10) is along the up-down direction of the sanitary napkin 1. In addition, as shown in FIG. 2 and FIG. 3, the absorbent body 10 has an absorbent core 11 along the lengthwise direction (up-down direction), a top sheet 12 disposed at a position closer to the skin side than the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a bottom sheet 14 disposed at a position closer to the non-skin side than the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the bottom sheet 14. FIG. 4 is a plan view and a sectional view of the absorbent body 10. As shown in FIG. 2, the absorbent body 10 of the present embodiment is a planar substantially oblong shape in which the lengthwise direction (i.e., the longitudinal direction of the absorbent body 10) is along the up-down direction of the sanitary napkin 1. In addition, as shown in FIG. 2 and FIG. 3, the absorbent body 10 has an absorbent core 11 along the lengthwise direction (up-down direction), a top sheet 12 disposed at a position closer to the skin side than the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a bottom sheet 14 disposed at a position closer to the non-skin side than the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the bottom sheet 14.

[0062] The absorbent core 11 is a member for absorbing and retaining liquid such as urine, and is formed of, for example, liquid-absorbing fibers such as pulp fibers mixed with superabsorbent polymers (SAP). In addition, the absorbent core 11 can be covered with a liquid-permeable sheet member (core cover sheet) such as tissue paper or nonwoven fabric.

[0063] The topsheet 12 is a liquid-permeable sheet member that can be in contact with the wearer's skin when worn, and is formed of, for example, a hydrophilic thermobonded nonwoven fabric, a spunbonded nonwoven fabric, or the like. In the present embodiment, as shown in a cross-sectional view of Fig. 1, the left and right side end portions of the topsheet 12 are folded back from the outer sides in the left and right directions of the absorbent core 11 toward the non-skin side in the thickness direction, and are configured to be interposed between the absorbent core 11 and the backsheet 14. FIG. 4

[0064] The second sheet 13 is a sheet member having substantially the same function and structure as the topsheet 12, and is laminated to the non-skin side of the topsheet 12. In addition, the second sheet 13 can not necessarily be provided in the absorbent main body 10.

[0065] The backsheet 14 is a liquid-impermeable sheet member that is formed of, for example, a resin film or the like, and is used to suppress leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside.

[0066] The side sheet 15 is a sheet member that is laminated to the non-skin side of the backsheet 14, and is formed of, for example, a nonwoven fabric such as a thermobonded nonwoven fabric. In addition, in the present embodiment, the side sheet 15 forms a pair of leakage-preventing wall portions 30, 30.

[0067] The leakage-preventing wall portions 30 are provided on both sides in the left and right directions of the absorbent main body 10, and are portions corresponding to so-called three-dimensional gathers. When the sanitary napkin 1 is worn, the leakage-preventing wall portions 30 stand up from both sides in the left and right directions of the absorbent main body 10 toward the skin side of the wearer, thereby suppressing leakage of excreted liquid such as menstrual blood to the outside of the absorbent main body 10.

[0068] In the present embodiment, as shown in a cross-sectional view of Fig. 1, the side sheet 15 extends to the outer sides in the left and right directions (lateral directions) of the absorbent core 11, and the left and right end portions of the absorbent main body 10 are bent toward the skin side in the thickness direction, with the end portions 15t being disposed at positions closer to the skin side than the absorbent core 11. The front (ventral) end portion in the longitudinal direction of the end portions 15t is joined to the skin side of the topsheet 12 with a front joining portion 32f, and the rear (dorsal) end portion in the longitudinal direction is joined to the skin side of the topsheet 12 with a rear joining portion 32b (see Fig. 2). In addition, the front and rear joining portions 32f, 32b are formed of, for example, a hot-melt adhesive or the like. FIG. 4 FIG. 4

[0069] In addition, in the end portions 15t, as shown in Fig. 2, the front and rear joining portions 32f, 32b are formed in a shape in which the front and rear joining portions 32f, 32b are curved in the longitudinal direction of the sanitary napkin 1.​​​FIG. 4 Thus, the side panels 15 are folded back and stacked in the thickness direction, with a leak-proof elastic member 31 provided between the stacked side panels 15, 15. The leak-proof elastic member 31 is provided in a longitudinally (vertically) elongated state, and is fixed at both ends in the longitudinal direction by a front joint 32f and a rear joint 32b, thereby exhibiting longitudinal (vertically) elasticity between the front joint 32f and the rear joint 32b. When wearing the sanitary napkin 1, based on the elasticity exhibited by the leak-proof elastic member 31, the end 15t of the leak-proof section 30 contracts longitudinally (vertically), so that the free end of the end 15t stands upright towards the wearer's skin. The elongation ratio of the leak-proof elastic member 31 provided in the leak-proof section 30 is preferably set to approximately 2.2 to 2.6 times. In addition, the elongation ratio is represented by the value obtained by dividing the length of the elastic member (leak-proof wall elastic member 31) in the elongated state by the length of the elastic member (leak-proof wall elastic member 31) in the natural state.

[0070] Furthermore, the absorbent body 10 includes a high-density portion 40 where the density of the absorbent core 11 is higher than that of the surrounding portion. The high-density portion 40 is formed by compressing the components constituting the absorbent body 10 along its thickness direction. For example... FIG. 4 As shown, the high-density portion 40 of this embodiment has a first high-density portion 41, a second high-density portion 42, and a third high-density portion 43, which are respectively formed into a linear shape by arranging a plurality of dot-shaped compression portions. By providing such a high-density portion 40, the liquid absorbent fibers of the absorbent core 11 can be prevented from spreading and collapsing. In addition, when wearing the sanitary napkin 1, the high-density portion 40 becomes a bending starting point, so that the absorbent core 11 can easily deform in three dimensions according to the shape of the wearer's body, and easily fit the wearer's body.

[0071] Furthermore, the absorbent body 10 is provided with a plurality of absorbent elastic members 50 that extend and contract along the longitudinal direction (vertical direction). These absorbent elastic members 50 are, for example, formed of rubber bands, and are positioned on the non-skin side of the absorbent core 11 when extended longitudinally (vertical direction) (specifically, between the backing sheet 14 and the side sheet 15). In the sanitary napkin 1 of this embodiment, as... FIG. 4 As shown, five absorbent elastic members 50 are provided at predetermined intervals along the left and right directions. The elongation ratio of the absorbent elastic members 50 is preferably set to about 2.7 to 3.2 times. By setting the elongation ratio of the absorbent elastic members 50 to be stronger than that of the leak-proof elastic members 31, the absorbent body 10 easily contracts from the non-skin side in the thickness direction, allowing it to easily conform to the wearer's body when wearing the sanitary napkin 1. In other words, due to the elasticity of the absorbent elastic members 50, the absorbent body 10 easily comes into close contact with the wearer's crotch area, making it difficult for menstrual blood and other excretory fluids to leak.

[0072] In the following, the absorbent elastic member 50 disposed at the outermost side in the left-right direction is referred to as the first elastic member 51, 51. In addition, the absorbent elastic member 50 disposed adjacent to the first elastic member 51, 51 on the inner side in the left-right direction of the first elastic member 51, 51 is referred to as the second elastic member 52, 52. In addition, the absorbent elastic member 50 disposed at a position further inward in the left-right direction than the second elastic member 52 is referred to as the third elastic member 53. In addition, the absorbent elastic member 50 can have at least one pair of first elastic members 51, 51 and one pair of second elastic members 52, 52. That is, the third elastic member 53 can be provided in two or more, or can be zero.

[0073] (Waist member 20)

[0074] The waist member 20 is composed of a plurality of sheet members, and in the present embodiment, includes a non-skin side sheet 21 and skin side sheets 22, 23 (refer to FIG. 3 ). In addition, in the following description, the portion of the waist member 20 on the front side (ventral side) of the central position CL in the longitudinal direction is referred to as the front waist member 20f, and the portion on the back side (dorsal side) of the central position CL is referred to as the back waist member 20b.

[0075] The non-skin side sheet 21 is a non-stretchable sheet member disposed on the most non-skin side of the sanitary napkin 1, and is formed of, for example, a spun-bond nonwoven fabric, an SMS nonwoven fabric, or the like. In the present embodiment, as shown in the plan view of FIG. 2 , the non-skin side sheet 21 has a shape that is tapered toward the inner side in the left-right direction at the central portion (a portion including the central position CL) in the longitudinal direction.

[0076] The skin side sheet 22 is a stretchable sheet member that is laminated on the skin side of the non-skin side sheet 21 on the front side (ventral side) in the longitudinal direction. The skin side sheet 22 is formed of, for example, a stretchable nonwoven fabric. The "stretchable nonwoven fabric" refers to a nonwoven fabric that contains stretchable fibers having stretchability and elongation fibers having lower contractility than the stretchable fibers, and to which an appropriate extension treatment such as gear stretching is applied. For the skin side sheet 22 of the present embodiment, as the stretchable fibers, a fiber of a polyurethane-based elastomer, which is one of thermoplastic elastomers having elasticity, can be used, and as the elongation fibers, a fiber of polypropylene (PP), which is one of polyolefin-based resins having non-elasticity, can be used.

[0077] The skin side sheet 22 is joined to the non-skin side sheet 21 by a plurality of sheet joining portions 60 (refer to FIG. 6B to FIG. 6C ) that are dispersed, whereby stretchability in at least the left-right direction is imparted to the front waist member 20f. In the present embodiment, the sheet joining portions 60 are formed using a known joining means such as ultrasonic welding.

[0078] The skin-side sheet 23 is a stretchable sheet member that is longitudinally stacked on the skin side of the non-skin-side sheet 21 on its rear (dorsal) side. The skin-side sheet 23 has the same structure as the skin-side sheet 22. That is, the skin-side sheet 23 is formed of stretchable nonwoven fabric, utilizing a plurality of dispersed sheet joints 60 (see reference). FIG. 6B to FIG. 6C It engages with the non-skin side panel 21. This imparts elasticity to the rear waist member 20b in at least the lateral direction.

[0079] 1 sanitary napkin FIG. 2 The unfolded state shown starts from the central position CL in the longitudinal direction of the absorbent body 10 (in FIG. 2 The absorbent body 10 and the waist member 20 are folded longitudinally (front-to-back direction) at the bending position (shown by a single dashed line). In this folded state, the two ends 20fe, 20fe of the front waist member 20f and the two ends 20be, 20be of the rear waist member 20b are joined using known joining methods such as sealing welds to form a side joint 20we. Thus, the folded waist members 20 (20f and 20b) are connected in a ring shape on the front (ventral) and rear (dorsal) sides, forming... FIG. 1 As shown, a sanitary napkin with one waist opening 1a and a pair of leg openings 1b forms an underwear-type sanitary napkin 1.

[0080] <Regarding the fit of sanitary napkin 1>

[0081] Next, we will explain the fit when wearing sanitary napkin 1. FIG. 5A This diagram serves as a comparative example to illustrate the fit of traditional sanitary napkins. FIG. 5B This is a diagram illustrating the fit of the sanitary napkin 1 as described in this embodiment.

[0082] exist FIG. 5A The sanitary napkin of the comparative example shown has an absorbent body 100. The structure of the absorbent body 100 of the comparative example is roughly the same as that of the absorbent body 10 of this embodiment, but the structure of the absorbent elastic member 50 is different from that of the absorbent body 10. That is, in the absorbent body 100 of the comparative example, three absorbent elastic members 50 are provided in the region between a pair of high-density portions 40, 40 in the left-right direction, and no elastic member equivalent to the first elastic member 51 of this embodiment is provided in the region outside the high-density portions 40, 40. In other words, in the absorbent body 100 of the comparative example, the absorbent elastic member 50 is provided in the central region in the left-right direction, but no absorbent elastic members 50 are provided in the regions on both sides in the left-right direction. In addition, the high-density portion 40 may not be necessary in the absorbent body 100.

[0083] In the case of wearing the sanitary napkin having the absorbent main body 100 of the comparative example, in the region (the central portion in the left-right direction) of the absorbent main body 100 which is on the inner side in the left-right direction than the pair of high-density portions 40, 40, the absorbent body elastic member 50 contracts, and thereby the absorbent core 11 is lifted toward the skin side of the wearer. That is, as shown in FIG. 6, the central portion in the left-right direction of the absorbent core 11 is deformed so as to be convex toward the skin side of the wearer, and is in close contact with the discharge port such as the vaginal orifice. Thus, it is possible to efficiently absorb menstrual blood and the like in the crotch portion. FIG. 5A In the case of wearing the sanitary napkin having the absorbent main body 100 of the comparative example, in the region (the central portion in the left-right direction) of the absorbent main body 100 which is on the inner side in the left-right direction than the pair of high-density portions 40, 40, the absorbent body elastic member 50 contracts, and thereby the absorbent core 11 is lifted toward the skin side of the wearer. That is, as shown in FIG. 6, the central portion in the left-right direction of the absorbent core 11 is deformed so as to be convex toward the skin side of the wearer, and is in close contact with the discharge port such as the vaginal orifice. Thus, it is possible to efficiently absorb menstrual blood and the like in the crotch portion.

[0084] On the other hand, the absorbent main body 100 of the comparative example is not provided with the absorbent body elastic member 50 in the region (the side portions in the left-right direction) of the absorbent main body 100 which is on the outer side in the left-right direction than the pair of high-density portions 40, 40, and thus the contracting force generated by the absorbent body elastic member 50 does not act in this region, and the absorbent core 11 is difficult to fit to the body of the wearer. That is, the absorbent core 11 is difficult to be in close contact with the regions on both sides of the discharge port. Thus, it is possible that the liquid such as menstrual blood which has a high viscosity leaks along the legs of the wearer in the transverse direction from the groin portion.

[0085] In contrast, in the case of the sanitary napkin 1 of the present embodiment, the region (the central portion in the left-right direction) of the absorbent main body 10 which is on the inner side in the left-right direction than the pair of high-density portions 40, 40 is similarly easily fitted to the vaginal orifice of the wearer as in the comparative example. That is, the second elastic member 52 (and the third elastic member 53) contracts, and thereby the central portion in the left-right direction of the absorbent core 11 is bent so as to be lifted toward the skin side of the wearer when viewed from the front side in the front-rear direction as shown in FIG. 7. That is, the region provided with the second elastic member 52 is deformed so as to be in a convex shape toward the skin side, and is easily in close contact with the discharge port such as the vaginal orifice. FIG. 5B In contrast, in the case of the sanitary napkin 1 of the present embodiment, the region (the central portion in the left-right direction) of the absorbent main body 10 which is on the inner side in the left-right direction than the pair of high-density portions 40, 40 is similarly easily fitted to the vaginal orifice of the wearer as in the comparative example. That is, the second elastic member 52 (and the third elastic member 53) contracts, and thereby the central portion in the left-right direction of the absorbent core 11 is bent so as to be lifted toward the skin side of the wearer when viewed from the front side in the front-rear direction as shown in FIG. 7. That is, the region provided with the second elastic member 52 is deformed so as to be in a convex shape toward the skin side, and is easily in close contact with the discharge port such as the vaginal orifice.

[0086] In addition, in the region (the side portions in the left-right direction) of the absorbent main body 10 which is on the outer side in the left-right direction than the pair of high-density portions 40, 40, the first elastic members 51, 51 contract, and thereby the side portions in the left-right direction of the absorbent core 1 are bent so as to be lifted toward the skin side of the wearer. That is, the regions provided with the first elastic members 51, 51 are deformed so as to be in a convex shape toward the skin side, and are easily fitted to the vicinity of the groin portion of the wearer. Thus, even if the discharge liquid such as menstrual blood flows along the legs of the wearer in the transverse direction, the discharge liquid is surely absorbed by the absorbent core 11 at the groin portion, and thus it is possible to make the side leakage difficult to occur.

[0087] In the absorbent body 10 of this embodiment, a high-density portion 40 is disposed between the first elastic member 51 and the second elastic member 52 in the left-right direction. Therefore, if the absorbent elastic members 50 (51, 52) contract, the high-density portion 40 becomes the bending point, and the absorbent core 11 easily deforms in three dimensions. That is, the area further inside the high-density portion 40 in the left-right direction is prone to protruding and deforming towards the wearer's excretory opening under the action of the contraction of the second elastic member 52, and the area further outside the high-density portion 40 in the left-right direction is prone to protruding and deforming towards the wearer's groin area under the action of the contraction of the first elastic member 51 (see reference). FIG. 5B ).

[0088] In this way, in sanitary napkin 1, with the high-density section 40 as the bending starting point, the central portion in the left-right direction where the second elastic member 52 is located and the two side portions in the left-right direction where the first elastic member 51 is located are respectively raised towards the wearer's crotch area, making close contact with the wearer's skin. Therefore, the fit of the discharge opening (vaginal opening) in the central portion in the left-right direction and the fit of the groin area in the two side portions in the left-right direction are both improved, making it difficult for menstrual blood and other excretory fluids to leak.

[0089] In addition, such as FIG. 4 As shown, in the longitudinal direction of the sanitary napkin 1 (absorbent body 10), the length Lb50 of the portion where the contractile force generated by the absorbent elastic member 50 acts on the area further back than the central position CL is longer than the length Lf50 of the portion where the contractile force generated by the absorbent elastic member 50 acts on the area further forward than the central position CL (Lb50>Lf50). That is, the magnitude of the contractile force acting on the position further back (back side) than the fold line (central position CL in the longitudinal direction) when the sanitary napkin 1 is folded back and forth is greater than the magnitude of the contractile force acting on the position further forward (abdominal side) than the fold line (central position CL). Therefore, when wearing the sanitary napkin 1, the absorbent body 10 fits more easily on the back side (buttocks side) of the wearer. Thus, for example, when the wearer is sitting or lying down, it is possible to effectively prevent menstrual blood and other fluids discharged from the vent from moving diagonally backward along the wearer's buttocks and leaking to the outside of the sanitary napkin 1.

[0090] Moreover, the length Lb50 of the portion in which the contraction force of the absorbent elastic member 50 acts is longer than the length Lb31 of the portion in which the contraction force of the leakage barrier elastic member 31 acts (Lb50 > Lb31) at a position on the rear side in the longitudinal direction from the central position CL. As described above, the leakage barrier portion 30 is erected toward the wearer's body side by the stretchability exhibited by the leakage barrier elastic member 31 when the sanitary napkin 1 is worn, and side leakage of the exudate is easily suppressed. However, if the erection height of the leakage barrier portion 30 is too high, a gap is formed between the absorbent core 11 and the wearer's skin, and it can be difficult for the exudate to be absorbed by the absorbent core 11.

[0091] In contrast, in the present embodiment, the contraction force of the absorbent elastic member 50 acting on the hip side is increased by being set to Lb50 > Lb31. Thus, the absorbent core 11 is easily brought into close contact with the wearer's skin, and the leakage barrier portion 30 is prevented from being erected too high toward the wearer's skin side. Thus, when the sanitary napkin 1 is worn, a gap (space) is suppressed from being formed between the wearer's hips and the absorbent core 11, and the absorbency of the exudate can be further improved. In addition, in the sanitary napkin 1 of the present embodiment, as described above, the elongation ratio of the absorbent elastic member 50 is set to be larger than the elongation ratio of the leakage barrier elastic member 31, and thus the contraction force of the absorbent elastic member 50 is increased, and it is further difficult for a gap (space) to be formed.

[0092] In addition, the high-density portion 40 (the third high-density portion 43) has a rear-side protruding portion 43c in which the rear side end portion is protruding toward the rear side (refer to FIG. 6) at a position on the rear side from the fold line (the central position CL). FIG. 4 The rear-side protruding portion 43c is arranged so as to be oriented from the outer side to the inner side in the left-right direction and from the lower side to the upper side in the up-down direction at the upper end portion on the rear side (the back side) from the fold line when the sanitary napkin 1 is worn. In the region in which the rear-side protruding portion 43c is arranged, the three-dimensional deformation of the absorbent core 11 described above is easily suppressed by the rear-side protruding portion 43c extending obliquely, and the absorbent core 11 is easily brought into close contact with the wearer's body in a state in which the planar shape is maintained. The region in which the rear-side protruding portion 43c is arranged is a position along the sacrum of the wearer when the sanitary napkin 1 is worn, and thus the absorbent core 11 can be made to conform flat to the sacral region of the wearer.

[0093] In addition, the first elastic members 51, 51 are arranged at a position on the outer side from the outer side end of the rear-side protruding portion 43c in the left-right direction. Thus, the both side portions of the rear-side protruding portion 43c are stretched by the first elastic members 51, and the both side portions of the absorbent core 11 can be made to conform to the hips of the wearer along the both sides of the sacrum in a state in which the rear side end portion region of the absorbent core 11 is maintained as a planar shape. Thus, the leakage of menstrual blood and the like on the hip side can be more easily suppressed.

[0094] FIG. 6A to FIG. 6C is a view illustrating a sheet joint portion 60 that joins the non-skin side sheet 21 and the skin side sheets 22, 23 of the waist member 20. FIG. 6A The kinds and the arrangement of the sheet joint portions 60 formed in the expanded and elongated state of the waist member 20 are shown. In the present embodiment, the non-skin side sheet 21 and the skin side sheets 22, 23 are joined to each other by two kinds of sheet joint portions 60. Specifically, in a region B shown in a diagonal line portion, the non-skin side sheet 21 and the skin side sheets 22, 23 are joined in a state of being stacked in the thickness direction by a plurality of first sheet joint portions 61. FIG. 6B In addition, in regions C and D, which are regions other than the region B in the waist member 20, the non-skin side sheet 21 and the skin side sheets 22, 23 are joined in a state of being stacked in the thickness direction by a plurality of second sheet joint portions 62. FIG. 6C In addition, in regions C and D, which are regions other than the region B in the waist member 20, the non-skin side sheet 21 and the skin side sheets 22, 23 are joined in a state of being stacked in the thickness direction by a plurality of second sheet joint portions 62.

[0095] As described above, each sheet joint portion 60 (61, 62) is formed using an ultrasonic welding or the like. Such thin sheet joint portions 60 are dispersed throughout the waist member 20, so that the waist member 20 can maintain good softness and stretchability, and also can ensure sufficient strength.

[0096] In addition, in the present embodiment, it is preferable that the total area of the first sheet joint portions 61 per unit area (area ratio of the first sheet joint portions 61) formed in the region B be larger than the total area of the second sheet joint portions 62 per unit area (area ratio of the second sheet joint portions 62) formed in the regions C and D. That is, it is preferable that the rigidity of the waist member 20 be higher in the region B than in the regions C and D.

[0097] In the case of viewing in the thickness direction in a state where the absorbent main body 10 is overlaid and mounted to the waist member 20, FIG. 6A The region C shown in (c) is located at a position that is inward in the leftward and rightward directions from the pair of high density portions 40, 40. This region is as in (b) of FIG. 8. FIG. 5BAs explained, this is the area where the absorbent core 11 protrudes and deforms towards the wearer's skin. Therefore, compared to area B, the waist member 20 has lower stiffness in area C, making it easier to maintain the elasticity of the waist member 20 in this area, thus ensuring the absorbent body 10 fits snugly against the wearer's crotch when wearing the sanitary napkin 1. On the other hand, in area B, located on the outer side in the left-right direction compared to the pair of high-density portions 40, 40, the stiffness is more likely to be higher than that of area C. Therefore, the stiffness of the absorbent body 10 is more likely to be maintained throughout area B, preventing compression (so-called shrinkage) of the absorbent body 10 in the left-right direction and thus reducing fit when wearing the sanitary napkin 1. Furthermore, area C has low stiffness and is more elastic than area B, so even with body movements such as turning over, the absorbent body 10 is more likely to fit snugly against the buttocks. This helps to prevent menstrual blood from leaking through the skin in the buttocks area.

[0098] Furthermore, in sanitary napkin 1, region C is located near the rear side in the longitudinal direction. In other words, the area of ​​the portion of region C that is rearward from the central position CL in the longitudinal direction is larger than the area of ​​the portion of region C that is forward from the central position CL (see reference). FIG. 6A In other words, the stiffness of the rear (back) side of the waist support member 20 in the longitudinal direction is lower than that of the front (abdominal) side. Therefore, when the sanitary napkin 1 is worn, the rear (back) area of ​​the waist support member 20 is prone to deformation. With this structure, when the wearer uses it in a lying position at night, even if movements such as turning over occur, the front side is easy to maintain its deformed shape. In addition, the reduced stiffness of the rear side makes it difficult to hinder the longitudinal (vertical) expansion and contraction of the absorbent elastic member 50, so the absorbent body 10 is easy to follow along the wearer's buttocks. Moreover, the rear (back) side of the waist support member 20 is also easy to contract in the lateral direction, so even if movements such as turning over occur, it is easy to maintain a close fit to the buttocks.

[0099] FIG. 7 This is a diagram illustrating the bottom joint 70 where the substrate 14 and side sheet 15 are joined in the absorbent body 10. (As shown in...) FIG. 4 As explained in the text, the back sheet 14 and the side sheet 15 are stacked in the thickness direction at a position closer to the non-skin side than the absorbent core 11. Furthermore, with the stretched absorbent elastic member 50 sandwiched between them, the back sheet 14 and the side sheet 15 are joined together via the bottom joint 70. FIG. 7 As shown, the bottom joint 70 is formed by arranging multiple bonding materials such as hot melt adhesive, which are coated in a thin strip along the longitudinal direction (vertical direction), at predetermined intervals along the left and right direction.

[0100] Such as FIG. 7As shown, two strip-shaped bottom engaging portions 70, 70 are arranged between the first elastic member 51 and the second elastic member 52 in the left-right direction, and one strip-shaped bottom engaging portion 70 is arranged between the second elastic member 52 and the third elastic member 53. That is, in the present embodiment, the area ratio of the bottom engaging portions 70 per unit area in the region between the first elastic member 51 and the second elastic member 52 is larger than the area ratio of the bottom engaging portions 70 per unit area in the region between the second elastic member 52 and the third elastic member 53. According to such a structure, at least in the region between the first elastic member 51 and the second elastic member 52, the bottom sheet 14 and the side sheet 15 are stably engaged, and the rigidity of the absorbent main body 10 is increased, as compared with the region between the second elastic member 52 and the third elastic member 53.

[0101] As described above, the high-density portion 40 is provided in the region between the first elastic member 51 and the second elastic member 52 in the left-right direction, and is a portion that becomes a bending starting point when the absorbent main body 10 is three-dimensionally deformed when the sanitary napkin 1 is worn. Thus, the rigidity of the absorbent main body 10 is increased in this region, and thus it is easy to form a habitual bend in the absorbent main body 10 (absorbent core 11), and in the case where the absorbent core 11 is deformed to protrude as shown in FIG. 5B , it is easy to maintain the shape. Thus, it is easy to maintain the state in which the absorbent main body 10 is attached to the crotch portion of the wearer, and it is possible to easily increase the absorbency of menstrual blood and the like, and to suppress leakage.

[0102] Further, as shown in FIG. 2 , in the sanitary napkin 1, in the up-down direction, the position of the lower end 20web of the side engaging portion 20we (both end portions 20fe) of the front side waist member 20f is higher than the position of the front side upper end 50fu of the absorbent body elastic member 50. That is, in the up-down direction, the side engaging portion 20we (both end portions 20fe) of the front side waist member 20f does not overlap the absorbent body elastic member 50. Thus, in the state where the sanitary napkin 1 is worn, when the wearer takes a forward bending posture or moves the leg to the front side, even if the front side waist member 20f is deformed in correspondence with the movement of the body (abdominal side) of the wearer, the influence of the deformation is difficult to propagate to the absorbent body elastic member 50. Thus, when the wearer moves the body, the displacement of the absorbent main body 10 in correspondence with the movement of the front side waist member 20f is suppressed, and it is possible to easily maintain the good attachability of the absorbent main body 10. Thus, it is possible to more easily suppress the leakage of menstrual blood and the like.

[0103] FIG. 8 is a view illustrating a main body engaging portion 80 for mounting and engaging the absorbent main body 10 to the waist member 20. In the sanitary napkin 1, the non-skin side surface of the absorbent main body 10 (the non-skin side surface of the side sheet 15) and the skin side surface of the waist member 20 are engaged by the main body engaging portion 80. FIG. 8The body engaging portions 80 shown in the oblique line portions of the left and right sides in FIG. 1 are engaged with each other. The body engaging portions 80 are formed using an engaging material such as a hot melt adhesive.

[0104] In the sanitary napkin 1 of the present embodiment, the width of the body engaging portions 80 in the left-right direction is larger at the longitudinal end portions (upper end portions in the up-down direction) than at the central portion in the longitudinal direction (crotch portion). That is, the body engaging portions 80 have portions with a width W70a in the left-right direction at the front and rear end portions in the longitudinal direction (front side upper end portion and rear side upper end portion in the underpants-type state), and a portion with a width W70b narrower than W70a between the front and rear end portions in the longitudinal direction (lower end portion in the underpants-type state) (W70a > W70b). According to such a structure, at the longitudinal end portions, the absorbent body 10 is engaged to the waist member 20 in a large area, and the absorbent body 10 is not easily twisted or deformed. Thus, at the wearer's abdomen and buttocks, the absorbent body 10 easily adheres in a large area in a flat manner. On the other hand, at the central portion in the longitudinal direction (crotch portion), the portion where the absorbent body 10 is engaged to the waist member 20 is narrow, and accordingly, the absorbent body 10 easily deforms. Thus, the rigidity of the absorbent body 10 in the vicinity of the crotch portion of the wearer is not excessively strong, the absorbent body 10 easily deforms, and it is possible to suppress a condition in which the edges of the left and right side portions of the absorbent body 10 press against the groin portion of the wearer when the sanitary napkin 1 is worn, causing an unpleasant feeling. In this way, the absorbent body 10 easily properly adheres to the wearer's body (abdominal portion, crotch portion, buttocks) as a whole, and it is possible to suppress leakage of menstrual blood or the like.

[0105] Further, the interval W51 of the pair of first elastic members 51, 51 in the left-right direction is narrower than the widths W70a, W70b of the body engaging portions 80 in the left-right direction (W51 < W70). The side sheets 15 constituting the leakage barrier wall portions 30 are engaged to the waist member 20 using the body engaging portions 80, and thus when the leakage barrier wall portions 30 stand up to the skin side, the side sheets 15 are able to bend to the skin side with the left and right ends of the body engaging portions 80 as a boundary. That is, the left and right ends of the body engaging portions 80 are positions that become the standing up starting points when the leakage barrier wall portions 30 stand up to the skin side. Thus, by making W51 < W70, at the standing up starting points of the leakage barrier wall portions 30, it is difficult for the contraction force generated by the first elastic members 51, 51 to act, and it is difficult to hinder the deformation (standing up) of the leakage barrier wall portions 30.

[0106] Further, the interval W51 of the pair of first elastic members 51, 51 in the left-right direction is wider than 1 / 2 of the width W11 of the absorbent core 11 (W51 > W11 / 2). If the interval W51 between the first elastic members 51, 51 is assumed to be 1 / 2 or less of the width W11 of the absorbent core 11, then in the left-right direction of the absorbent core 11, the area of the central portion becomes narrow and the areas of the left and right side portions become wide. In this case, the absorbent core 11 is difficult to formFIG. 5B The central portion of the absorbent core 11 in the left-right direction is difficult to fit to the discharge port with such a convex shape. In addition, even if the first elastic member 51 contracts, the left and right side portions of the absorbent core 11 do not sufficiently lift, and the absorbent core 11 is difficult to fit to the groin portion of the wearer. In contrast, by making the interval W51 between the first elastic members 51 larger than 1 / 2 of the width W11 of the absorbent core 11, it is easy to make the absorbent core 11 appropriately convexly deform, and it is easy to achieve good fit.

[0107] In addition, the high-density portion 40 of the present embodiment does not overlap with the fold line (central position CL in the longitudinal direction) when the sanitary napkin 1 is folded in the front-rear direction. In FIG. 4 In the present embodiment, in the longitudinal direction, the central position CL is disposed between the second high-density portion 42 and the third high-density portion 43. That is, the high-density portion 40 is provided in a manner not having a portion overlapping with the central position CL (fold line) in the longitudinal direction. The high-density portion 40 is discontinuous in the longitudinal direction across the fold line, so when the sanitary napkin 1 is worn, the action of the ventral side and the action of the dorsal side are difficult to be linked, and the absorbent main body 10 is easy to deform independently in each region. Therefore, the ventral side and the dorsal side of the absorbent main body 10 are easy to follow the action of the wearer's body, respectively, and it is possible to further improve the fit. Thus, it is easy to suppress leakage of menstrual blood and the like.

[0108] In addition, the high-density portion 40 of the sanitary napkin 1 has a reverse portion 40r that reverses to the opposite side in the longitudinal direction. In FIG. 4 In the present embodiment, the second high-density portion 42 has a reverse portion 42r1 in which the front side end portion in the longitudinal direction reverses to the rear side, and has a reverse portion 42r2 in which the rear side end portion in the longitudinal direction reverses to the front side. In addition, the reverse portions 42r1, 42r2 are disposed so as to straddle the first elastic member 51 in the left-right direction. That is, the reverse portions 42r1, 42r2 have portions that cross the first elastic member 51. In the portions where the reverse portions 42r1, 42r2 cross the first elastic member 51, the contraction force generated by the first elastic member 51 is difficult to act on the absorbent core 11 under the influence of the reverse portions 42r1, 42r2. Therefore, by adjusting the disposition of the reverse portion 40r, it is possible to locally control the deformation of the absorbent core 11. For example, in FIG. 4 In such a case, by attenuating the contraction force generated by the first elastic member 51 between the reverse portion 42r1 and the reverse portion 42r2, the absorbent core 11 is easy to maintain a planar shape in this region compared to other regions. By doing so, it is easy to make the absorbent core 11 fit along the plane of the wearer's abdomen.

[0109] Other

[0110] The above-described embodiments are for easy understanding of the present application and are not intended to limit the interpretation of the present application. The present application can be changed and modified without departing from the spirit thereof, and the present application naturally includes equivalents thereof.

[0111] In the above-described embodiments, sanitary napkin 1 is described as an example of a panty-type absorbent article, but the present application can also be applied to other absorbent articles other than sanitary napkins. For example, the panty-type absorbent article can also be a child-use or adult-use short pants-type (panty-type) diaper, a short pants-type (panty-type) absorbent pad, or the like.

[0112] In the above-described embodiments, as the skin-side sheets 22, 23 constituting the waist member 20, stretchable nonwoven fabric or the like stretchable sheet is used, thereby imparting stretchability in the left-right direction to the waist member 20, but other stretchable members can also be provided to the waist member 20. For example, as shown in FIG. 8, a waist elastic member 25 such as an elastic band can also be provided to the upper end portions of the front waist member 20f and the rear waist member 20b in a manner so as to be stretchable in the left-right direction. By providing such a waist elastic member 25, the fit of the waist opening lb is further improved, and in wearing the sanitary napkin 1, the positional displacement of the waist member 20 can be suppressed. FIG. 2

[0113] In addition, in the case where the waist elastic member 25 is provided to the waist member 20, at least a part of the waist elastic member 25 is preferably arranged so as to overlap the skin-side sheets 22, 23, respectively. By doing so, the stretchability in the left-right direction exhibited by the waist elastic member 25 and the stretchability in the left-right direction exhibited by the skin-side sheets 22, 23 are linked, and the fit of the sanitary napkin 1 to the wearer's waist can be further improved.​

Claims

1. A panty-type sanitary napkin having an up-and-down direction, a left-and-right direction, and a front-and-rear direction crossing each other, the panty-type sanitary napkin having an absorbent main body provided with an absorbent core having a liquid absorbency, and a waist member overlaid on a non-skin side of the absorbent main body, characterized in that a plurality of elastic members extending in the up-and-down direction are provided at predetermined intervals in the left-and-right direction at a position on the non-skin side of the absorbent core of the absorbent main body, the elastic members each have a first elastic member disposed at an outermost side in the left-and-right direction and a second elastic member disposed on an inner side of the first elastic member adjacent to the first elastic member, the absorbent main body has a high-density portion in which the density of the absorbent core is higher than that of a surrounding portion at least in a region between the first elastic member and the second elastic member in the left-and-right direction, the high-density portion has a reversal portion in which a part of the region is reversed to an opposite side in the up-and-down direction, the reversal portion has a portion crossing the first elastic member.

2. The panty-type sanitary napkin according to claim 1, characterized in that the panty-type sanitary napkin has a fold line when the panty-type sanitary napkin is folded in the front-and-rear direction, a length of a portion in which a contracting force generated by the elastic members acts at a position on a rear side of the fold line is longer than a length of a portion in which a contracting force generated by the elastic members acts at a position on a front side of the fold line.

3. The panty-type sanitary napkin according to claim 2, characterized in that a pair of leakage-preventing wall portions are provided at both sides in the left-and-right direction of the absorbent main body, the leakage-preventing wall portions have leakage-preventing wall elastic members extending in the up-and-down direction, a length of a portion in which a contracting force generated by the elastic members acts at least at a position on a rear side of the fold line is longer than a length of a portion in which a contracting force generated by the leakage-preventing wall elastic members acts.

4. The panty-type sanitary napkin according to claim 2 or 3, characterized in that the high-density portion has a rear-side protruding portion protruding from an outer side toward an inner side in the left-and-right direction and from a lower side toward an upper side in the up-and-down direction at an upper end portion on a rear side of the fold line, the first elastic member is located at a position on an outer side of an outer side end of the rear-side protruding portion in the left-and-right direction.

5. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that the waist member has at least a skin-side sheet and a non-skin-side sheet laminated on a non-skin side of the skin-side sheet, the panty-type sanitary napkin has a sheet joint portion joining the skin-side sheet and the non-skin-side sheet, a region in which the absorbent main body and the waist member overlap when viewed in a thickness direction, a total area of the sheet joint portion per unit area formed in a region on an inner side in the left-and-right direction of the high-density portion is smaller than a total area of the sheet joint portion per unit area formed in a region on an outer side in the left-and-right direction of the high-density portion.

6. The panty-type sanitary napkin according to claim 5, characterized in that a region in which the absorbent main body overlaps with the waist member when viewed in the thickness direction and is on an inner side in the left-right direction than the high-density portion, the total area of the sheet joint portions per unit area is smaller in a region on a rear side than a fold line when the panty-type sanitary napkin is folded in the front-rear direction than in a region on a front side than the fold line.

7. The panty-type sanitary napkin according to any one of claims 1 to 3, wherein the absorbent main body has a liquid-impermeable back sheet disposed at a position on a non-skin side than the absorbent core, and a side sheet laminated on a non-skin side of the back sheet, the panty-type sanitary napkin has a back joint portion that joins the back sheet and the side sheet, in the left-right direction, a third elastic member is disposed on an inner side of the second elastic member adjacent to the second elastic member, in the left-right direction, the total area of the back joint portion per unit area is greater in a region between the first elastic member and the second elastic member than in a region between the second elastic member and the third elastic member.

8. The panty-type sanitary napkin according to any one of claims 1 to 3, wherein the waist member has a front-side waist member and a rear-side waist member, in both end portions in the left-right direction, a side joint portion that joins the front-side waist member and the rear-side waist member to each other is provided, the lower end of the side joint portion is positioned higher than the upper end of the first elastic member at a position on a front side than a fold line when the panty-type sanitary napkin is folded in the front-rear direction.

9. The panty-type sanitary napkin according to any one of claims 1 to 3, wherein the panty-type sanitary napkin has a main body joint portion that joins the absorbent main body to a skin side of the waist member, in the left-right direction, the interval of the pair of first elastic members is greater than 1 / 2 of the width of the absorbent core and is smaller than the width of the main body joint portion.

10. The panty-type sanitary napkin according to claim 9, wherein the width of the main body joint portion at the upper end portion in the up-down direction is greater than the width of the main body joint portion at the lower end portion in the up-down direction.

11. The panty-type sanitary napkin according to any one of claims 1 to 3, wherein the panty-type sanitary napkin has a fold line when the panty-type sanitary napkin is folded in the front-rear direction, no portion of the high-density portion overlaps with the fold line.

12. A panty-type sanitary napkin having an up-down direction, a left-right direction, and a front-rear direction that intersect each other, the panty-type sanitary napkin has an absorbent main body that includes an absorbent core having a liquid-absorbing property, and a waist member that is disposed on a non-skin side of the absorbent main body in an overlapping manner, characterized in that a plurality of elastic members that stretch and contract in the up-down direction are provided at a predetermined interval in the left-right direction at a position on a non-skin side than the absorbent core of the absorbent main body, The elastic member has a first elastic member disposed at an outermost side and a second elastic member disposed at an inner side of the first elastic member adjacent to the first elastic member on both sides in the left-right direction, The absorbent main body has a high density portion having a higher density than a surrounding portion on both sides in the left-right direction of the absorbent core, The region in which the first elastic member is disposed and the region in which the second elastic member is disposed in the absorbent main body each have a shape projecting toward a skin side of a wearer when viewed in the front-rear direction, The high density portion has a reversal portion in which a part of the region reverses to an opposite side in the up-down direction, The reversal portion has a portion crossing the first elastic member.

13. The panty-type sanitary napkin according to claim 12, wherein The panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in the front-rear direction, A length of a portion in which a contracting force generated by the elastic member acts at a position on a rear side of the folding line is longer than a length of a portion in which a contracting force generated by the elastic member acts at a position on a front side of the folding line.

14. The panty-type sanitary napkin according to claim 13, wherein A pair of leakage preventing wall portions are provided at both sides in the left-right direction of the absorbent main body, The leakage preventing wall portions have leakage preventing wall elastic members which stretch and contract in the up-down direction, A length of a portion in which a contracting force generated by the elastic member acts is longer than a length of a portion in which a contracting force generated by the leakage preventing wall elastic members acts at least at a position on a rear side of the folding line.

15. The panty-type sanitary napkin according to claim 13 or 14, wherein The high density portion has a rear side protruding portion which protrudes from an outer side toward an inner side in the left-right direction and from a lower side toward an upper side in the up-down direction at an upper end portion on a rear side of the folding line, The first elastic member is located at a position on an outer side of an outer side end of the rear side protruding portion in the left-right direction.

16. The panty-type sanitary napkin according to any one of claims 12 to 14, wherein The waist member has at least a skin side sheet and a non-skin side sheet which is laminated to a non-skin side of the skin side sheet, The panty-type sanitary napkin has a sheet joint portion which joins the skin side sheet and the non-skin side sheet, A region in which the absorbent main body and the waist member overlap when viewed in a thickness direction, An area of the sheet joint portion per unit area formed in a region on an inner side of the high density portion in the left-right direction is smaller than an area of the sheet joint portion per unit area formed in a region on an outer side of the high density portion in the left-right direction.

17. The panty-type sanitary napkin according to claim 16, wherein A region in which the absorbent main body and the waist member overlap when viewed in a thickness direction and which is a region on an inner side of the high density portion in the left-right direction, The total area of the sheet joint portions per unit area is smaller in a region on a rear side of a fold line when the panty-type sanitary napkin is folded in the front-rear direction than in a region on a front side of the fold line.

18. The panty-type sanitary napkin according to any one of claims 12 to 14, wherein the absorbent main body has a liquid-impermeable back sheet disposed at a position on a non-skin side of the absorbent core and a side sheet laminated on a non-skin side of the back sheet, the panty-type sanitary napkin has a back joint portion that joins the back sheet and the side sheet, in the left-right direction, a third elastic member is disposed on an inner side of the second elastic member adjacent to the second elastic member, in the left-right direction, the total area of the back joint portion per unit area is larger in a region between the first elastic member and the second elastic member than in a region between the second elastic member and the third elastic member.

19. The panty-type sanitary napkin according to any one of claims 12 to 14, wherein the waist member has a front side waist member and a rear side waist member, in both end portions in the left-right direction, a side joint portion that joins the front side waist member and the rear side waist member to each other is provided, in a position on a front side of a fold line when the panty-type sanitary napkin is folded in the front-rear direction, a position of a lower end of the side joint portion is higher than a position of an upper end of the first elastic member.

20. The panty-type sanitary napkin according to any one of claims 12 to 14, wherein the panty-type sanitary napkin has a main body joint portion that joins the absorbent main body to a skin side of the waist member, in the left-right direction, a distance between the pair of first elastic members is larger than 1 / 2 of a width of the absorbent core and smaller than a width of the main body joint portion.

21. The panty-type sanitary napkin according to claim 20, wherein a width of the main body joint portion at an upper end portion in the up-down direction is larger than a width of the main body joint portion at a lower end portion in the up-down direction.

22. The panty-type sanitary napkin according to any one of claims 12 to 14, wherein the panty-type sanitary napkin has a fold line when the panty-type sanitary napkin is folded in the front-rear direction, a portion in which the high density portion overlaps the fold line is not provided.

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