Underwear sanitary napkins

Abstract

The present invention provides a panty-type sanitary napkin having a high fit at the excretion opening and on both sides in the left-right direction. The panty-type sanitary napkin (1) comprises an absorbent body (10) having an absorbent core (11) and a waist member (20), wherein a plurality of elastic members (50) that stretch in the vertical direction are provided at predetermined intervals in the left-right direction at a position on the non-skin side relative to the absorbent core (11), the elastic members (50) comprising a first elastic member (51) disposed on the outermost side and a second elastic member (52) disposed adjacent to the first elastic member (51) and on the inner side of the first elastic member (51), respectively, on both sides in the left-right direction, and the absorbent body (10) comprises a high-density portion (40) in which the density of the absorbent core (11) is higher than that of the surrounding portion, at least in the region between the first elastic member (51) and the second elastic member (52) in the left-right direction.

Description

Technical Field

[0001] The present invention relates to a panty-type sanitary napkin. Background Art

[0002] Absorbent articles such as disposable diapers and sanitary napkins, which have a liquid-absorbing absorbent body, are known. In such absorbent articles, stretchable elastic members are arranged along the longitudinal direction of the absorbent body to improve the fit of the absorbent body when worn. For example, Patent Document 1 discloses a technique in which multiple crotch elastic members 17 are arranged along the longitudinal direction of the absorbent body 3. The contractile force of the crotch elastic members 17 lifts the absorbent body 3 upward (toward the wearer's skin), thereby improving the fit of the crotch region of the wearer.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-350809 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In the absorbent article of Patent Document 1, the area where the elastic member (crotch elastic member 17) is located allows the absorbent body to maintain close contact with the wearer's crotch (excretory opening such as the vagina). However, in the areas on the left and right sides of the absorbent article where the elastic member is not located, the absorbent body struggles to maintain close contact with the wearer's skin. Consequently, there is a risk that highly viscous excretion fluids such as menstrual blood may leak along the wearer's skin (e.g., between the legs) to the lateral sides of the absorbent body (causing side leakage).

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a panty-type sanitary napkin having a high fit at the excretion opening and on both sides in the left-right direction.

[0009] Solutions for solving problems

[0010] The main invention for achieving the above-mentioned purpose is a panty-type sanitary napkin, which has mutually intersecting up and down directions, left and right directions, and front and back directions, and the panty-type sanitary napkin has: an absorbent body, which has a liquid-absorbent absorbent core; and a waist member, which is overlapped and arranged on the non-skin side of the absorbent body, and is characterized in that a plurality of elastic members that can be stretched and contracted along the up and down directions are arranged at a predetermined interval along the left and right directions at a position closer to the non-skin side than the absorbent core of the absorbent body, and the elastic members have a first elastic member arranged on the outermost side and a second elastic member arranged on the inner side of the first elastic member adjacent to the first elastic member on both sides of the left and right directions, and the absorbent body has a high-density portion in which the density of the absorbent core is higher than the density of the surrounding parts in at least the area between the first elastic member and the second elastic member in the left and right directions.

[0011] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, a pull-on sanitary napkin having a high fit at the excretion opening and on both sides in the left-right direction can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic perspective view of the sanitary napkin 1.

[0015] Figure 2 This is a plan view of the sanitary napkin 1 in the unfolded and stretched state as viewed from the skin side in the thickness direction.

[0016] Figure 3 yes Figure 2 AA cross-sectional view of .

[0017] Figure 4 1 and 2 are a plan view and a cross-sectional view of the absorbent body 10 .

[0018] Figure 5A This is a diagram illustrating the fit of a conventional sanitary napkin as a comparative example. Figure 5B These are diagrams explaining the fit of the sanitary napkin 1 according to this embodiment when worn.

[0019] Figures 6A to 6C This is a diagram for explaining the sheet joining portion 60 that joins the non-skin side sheet 21 and the skin side sheets 22 and 23 of the waist member 20 .

[0020] Figure 7 This is a diagram illustrating the bottom joint portion 70 that joins the back sheet 14 and the side sheets 15 in the absorbent body 10 .

[0021] Figure 8 This is a diagram illustrating the main body joint portion 80 for attaching and joining the absorbent main body 10 to the waist member 20.

[0022] Description of Reference Numerals

[0023] 1: sanitary napkin (underwear type sanitary napkin, absorbent article), 1a: waist opening, 1b: leg opening, 10: absorbent body, 11: absorbent core, 12: top sheet, 13: second sheet, 14: back sheet, 15: side sheet, 15t: end, 20: waist member, 20f: front waist member, 20fe: end, 20b: back waist member, 20be: end, 20we: side joint, 21: non-skin side sheet, 22: skin side sheet, 23: skin side sheet, 25: waist elastic member, 30: leak-proof wall portion, 31: leak-proof wall elastic member, 32 f: front side joining portion, 32b: back side joining portion, 40: high-density portion, 41: 1st high-density portion, 42: 2nd high-density portion, 42r1: reversal portion, 42r2: reversal portion, 43: 3rd high-density portion, 43c: back side convex portion, 50: absorbent body elastic component, 51: 1st elastic component, 52: 2nd elastic component, 53: 3rd elastic component, 60: sheet joining portion, 61: 1st sheet joining portion, 62: 2nd sheet joining portion, 70: bottom joining portion, 80: main body joining portion, 100: absorbent body (comparative example), CL: center position (folding line). DETAILED DESCRIPTION

[0024] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0025] A panty-type sanitary napkin having mutually intersecting up-down directions, left-right directions, and front-back directions, the panty-type sanitary napkin comprising: an absorbent main body having a liquid-absorbent absorbent core; and a waist member overlappingly arranged on the non-skin side of the absorbent main body, characterized in that a plurality of elastic members that can be stretched and contracted along the up-down directions are provided at predetermined intervals along the left-right directions at a position closer to the non-skin side than the absorbent core of the absorbent main body, the elastic members respectively comprising 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 on both sides of the left-right directions, the absorbent main body having a high-density portion in which the density of the absorbent core is higher than the density of the surrounding portion in at least the area between the first elastic member and the second elastic member in the left-right directions.

[0026] With this panty-type sanitary napkin, the high-density portion serves as the starting point for the fold, with the central portion of the absorbent core, where the second elastic member is located, and the side portions, where the first elastic member is located, rising toward the wearer's crotch, closely contacting the wearer's skin. This improves the fit of the absorbent core in the wearer's crotch, at the central portion's excretion opening (vaginal opening), and at the side portions, where the first elastic member is located, preventing leakage of menstrual blood and other excretions.

[0027] In addition, it is clear that a panty-type sanitary napkin has mutually intersecting up and down directions, left and right directions, and front and back directions, and the panty-type sanitary napkin has: an absorbent body having a liquid-absorbent absorbent core; and a waist member, which is overlapped and arranged on the non-skin side of the absorbent body, and is characterized in that a plurality of elastic members that can be stretched and contracted along the up and down directions are provided at a position closer to the non-skin side than the absorbent core of the absorbent body at predetermined intervals along the left and right directions, the elastic members respectively have a first elastic member arranged on the outermost side and a second elastic member arranged on the inner side of the first elastic member adjacent to the first elastic member on both sides of the left and right directions, the absorbent body has a high-density portion on both sides of the left and right directions in which the density of the absorbent core is higher than the density of the surrounding portion, and when viewed along the front and back directions, the area in the absorbent body where the first elastic member is arranged and the area where the second elastic member is arranged are respectively convex toward the skin side of the wearer.

[0028] In this panty-type sanitary napkin, the absorbent core's central portion, where the second elastic member is disposed, and its side portions, where the first elastic member is disposed, are deformed to bulge upward, lifting toward the wearer's crotch. This improves the fit of the absorbent core to the wearer's crotch, the excretion opening (vaginal opening) in the central portion, and the groin area on the side portions, preventing leakage of menstrual blood and other excretions.

[0029] As for the underwear-type sanitary napkin, it is desired that the underwear-type sanitary napkin has a folding line when the underwear-type sanitary napkin is folded in the front-to-back direction, and the length of the portion on which the contraction force generated by the elastic component acts at a position farther back than the folding line is longer than the length of the portion on which the contraction force generated by the elastic component acts at a position farther forward than the folding line.

[0030] With this type of panty-type sanitary napkin, the contraction force acting on the rear side (dorsal side) relative to the fold line is greater than the contraction force acting on the front side (ventral side), making it easier for the absorbent body to fit the wearer's back side (buttocks side). This effectively prevents menstrual blood discharged from the excretion opening from moving diagonally behind the wearer's buttocks and leaking out of the panty-type sanitary napkin.

[0031] As for the underwear-type sanitary napkin, it is desired that a pair of leak-proof wall portions are provided on both sides of the absorbent body in the left-right direction, and the leak-proof wall portions have leak-proof wall elastic components that are stretched and retracted along the up-down direction, and at least at a position farther back than the folding line, the length of the portion acted upon by the contraction force generated by the elastic component is longer than the length of the portion acted upon by the contraction force generated by the leak-proof wall elastic component.

[0032] With this panty-type sanitary napkin, the elastic member acting on the wearer's back (buttocks) exerts a higher contractile force than the elastic member of the leakage-barrier wall, thereby facilitating close contact between the absorbent core and the wearer's skin and preventing the leakage-barrier wall from rising excessively toward the wearer's skin. Consequently, when the panty-type sanitary napkin is worn, the formation of a gap (space) between the wearer's buttocks and the absorbent core is suppressed, thereby preventing excrement from leaking.

[0033] As for the underwear-type sanitary napkin, it is desired that the high-density portion has a rear convex portion at the upper end portion farther back than the folding line, extending from the outer side toward the inner side in the left-right direction and from the lower side toward the upper side in the up-down direction, and in the left-right direction, the first elastic member is located farther outward than the outer end of the rear convex portion.

[0034] According to this panty-type sanitary napkin, the portion provided with the obliquely extending rear convex portion can easily suppress three-dimensional deformation of the absorbent core. In addition, both sides of the rear convex portion are stretched by the first elastic member, thereby allowing the absorbent core to fit closely to the wearer's sacrum (buttocks) while maintaining the rear end region of the absorbent core in a flat shape.

[0035] As the underwear-type sanitary napkin, it is desired that the waist member has at least a skin side piece and a non-skin side piece stacked on the non-skin side of the skin side piece, and the underwear-type sanitary napkin has a sheet joint portion that joins the skin side piece and the non-skin side piece, and the area where the absorbent body and the waist member overlap when viewed along the thickness direction, the total area of ​​the sheet joint portion formed per unit area in the area on the inner side of the high-density portion in the left-right direction is smaller than the total area of ​​the sheet joint portion formed per unit area in the area on the outer side of the high-density portion in the left-right direction.

[0036] With this panty-type sanitary napkin, by increasing the area ratio of the joint in the region laterally outward of the pair of high-density sections, the elastic stress can be reduced, making it easier to ensure the width of the absorbent body in the laterally direction. Furthermore, by reducing the area ratio of the joint in the region laterally inward of the high-density sections, the elastic force of the waist member can be effectively utilized, allowing the absorbent body to more easily fit the wearer's gluteal groove. This ensures that the sanitary napkin maintains a good fit even when the wearer moves their legs, preventing menstrual blood from leaking through the skin.

[0037] As for the underwear-type sanitary napkin, it is desired that, when viewed in the thickness direction, the area where the absorbent body overlaps with the waist member and is an area closer to the inside in the left-right direction than the high-density part, the total area of ​​the sheet joints formed per unit area in the area closer to the rear side than the folding line when the underwear-type sanitary napkin is folded in the front-to-back direction is smaller than the total area of ​​the sheet joints formed per unit area in the area closer to the front side than the folding line.

[0038] According to such a panty-type sanitary napkin, when worn, the rigidity of the front side of the waist member is increased compared to the rear side. As a result, when the wearer uses the panty-type sanitary napkin in a lying position at night, even if the wearer turns over, the absorbent body can easily maintain its deformed shape on the front side (ventral side). On the other hand, by reducing the rigidity on the rear side (dorsal side) of the waist member, the longitudinal (up and down) expansion and contraction of the elastic member of the absorbent body is less likely to be hindered, so the absorbent body can easily follow the gluteal groove. In addition, the waist member is also easy to shrink in the left and right directions, so it is easy to maintain contact with the buttocks even if the wearer turns over.

[0039] As the underpants-type sanitary napkin, it is desired that the absorbent body has a liquid-impermeable backsheet arranged at a position closer to the non-skin side than the absorbent core and side panels stacked on the non-skin side of the backsheet, the underpants-type sanitary napkin has a bottom joint portion joining the backsheet and the side panels, and has a third elastic member arranged on the inner side of the second elastic member adjacent to the second elastic member in the left-right direction, and in the left-right direction, the total area of ​​the bottom joint portion formed per unit area in the area between the first elastic member and the second elastic member is larger than the total area of ​​the bottom joint portion formed per unit area in the area between the second elastic member and the third elastic member.

[0040] With this panty-type sanitary napkin, the bonding strength between the backsheet and the side panels is enhanced in the region between the first and second elastic members, thereby increasing the rigidity of the absorbent body. Consequently, this region facilitates the formation of a habitual fold in the absorbent body (absorbent core), making it easier to maintain its shape even when the absorbent core bulges and deforms. This facilitates maintaining the absorbent body in close contact with the wearer's crotch, improving the absorbency of menstrual blood and the like, and preventing leakage.

[0041] As for the underwear-type sanitary napkin, it is desired that the waist member has a front waist member and a rear waist member, and has side joints at both ends in the left and right directions for joining the front waist member and the rear waist member to each other, and the position of the lower end of the side joint is higher than the position of the upper end of the first elastic member at a position closer to the front side than the folding line when the underwear-type sanitary napkin is folded in half along the front-to-back direction.

[0042] According to such a panty-type sanitary napkin, even if the front waist member is deformed in accordance with the movement of the wearer's body (ventral side) during wearing, the influence of the deformation is difficult to propagate to the absorbent elastic member. Thus, the absorbent body is prevented from shifting in position in conjunction with the movement of the front waist member, and the good fit of the absorbent body can be easily maintained.

[0043] As the underwear-type sanitary napkin, it is desired that the underwear-type sanitary napkin has a main body joint portion that joins the absorbent body to the skin side of the waist portion, and in the left and right directions, the interval between a pair of the 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.

[0044] According to this panty-type sanitary napkin, by making the spacing between the first elastic members smaller than the width of the main body joint, the elastic force generated by the first elastic members is less likely to act on the starting point of the leakage barrier wall (the outer end of the main body joint), and the rising of the leakage barrier wall is less likely to be hindered. In addition, by making the spacing between the first elastic members larger than 1 / 2 the width of the absorbent core, it is possible to prevent the central area of ​​the absorbent core in the left-right direction from being too narrow, thereby preventing it from bulging and deforming and making it difficult to fit the excretion opening.

[0045] In this pull-on sanitary napkin, it is desirable that the width of the upper end portion of the main body joining portion in the vertical direction is greater than the width of the lower end portion of the main body joining portion in the vertical direction.

[0046] According to this panty-type sanitary napkin, the absorbent body is joined to the waist member over a large area at the upper end in the vertical direction, making it difficult for the absorbent body to twist or deform, and allowing the absorbent body to easily and flatly fit the wearer's body over a large area. On the other hand, the portion where the absorbent body is joined to the waist member at the lower end in the vertical direction (the crotch portion) is narrow, making it easy for the absorbent body to deform, thereby preventing the side edges of the absorbent body from pressing against the wearer's groin area and causing discomfort.

[0047] The pull-on sanitary napkin preferably has a folding line when the pull-on sanitary napkin is folded in half along the front-back direction, and does not have a portion where the high-density portion overlaps the folding line.

[0048] With this type of panty-type sanitary napkin, the high-density portion is discontinuous across the fold line. Therefore, when the panty-type sanitary napkin is worn, the absorbent body can easily and independently deform in the ventral and dorsal regions. This allows the ventral and dorsal sides of the absorbent body to easily follow the wearer's body movements, further improving the fit. This also helps prevent leakage of menstrual blood and other substances.

[0049] In this pull-on sanitary napkin, it is desirable that the high-density portion include an inverted portion in which a portion is inverted to the opposite side in the up-down direction, and the inverted portion includes a portion intersecting with the first elastic member.

[0050] With this panty-type sanitary napkin, at the intersection of the inversion portion and the first elastic member, the contraction force generated by the first elastic member is less likely to act on the absorbent core due to the influence of the inversion portion. Therefore, by adjusting the configuration of the inversion portion, the deformation of the absorbent core can be locally controlled. This facilitates the absorbent core to conform to the wearer's body.

[0051] ===Implementation Method===

[0052] As an example of the absorbent article according to the embodiment of the present invention, a pull-on sanitary napkin 1 (hereinafter, also simply referred to as “sanitary napkin 1”) will be described.

[0053] <Basic Structure of Sanitary Napkin 1>

[0054] Figure 1 It is a schematic perspective view of the sanitary napkin 1 according to this embodiment. Figure 2 This is a plan view of the sanitary napkin 1 in the unfolded and stretched state as viewed from the skin side in the thickness direction. Figure 3 yes Figure 2 AA cross-sectional view of .

[0055] 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 stretched to a wrinkle-free state by stretching the various elastic components of the sanitary napkin 1 (for example, the absorbent elastic component 50 described later, the skin side panels 22, 23, etc.), specifically, the state in which the dimensions of the various components constituting the sanitary napkin 1 (for example, the non-skin side panels 21 and the skin side panels 22, 23, etc. described later) become consistent with or close to the dimensions of the component itself.

[0056] like Figure 1 As shown in FIG, the sanitary napkin 1 has a "up-down direction", a "left-right direction" and a "front-back direction" which are orthogonal to each other. Figure 3 As shown, the direction in which the components are stacked is the "thickness direction." The side in the up-down direction that becomes the wearer's torso when the wearer is wearing the sanitary napkin 1 is designated as the "upper side," and the side that becomes the wearer's crotch is designated as the "lower side." Furthermore, the side in the front-to-back direction that becomes the wearer's ventral side when worn is designated as the "front side," and the side that becomes the wearer's back is designated as the "back side." Furthermore, the side in the thickness direction that comes into contact with the wearer's skin when the wearer is wearing the sanitary napkin 1 is designated as the "skin side," and the opposite side is designated as the "non-skin side."

[0057] In addition, sanitary napkin 1 Figure 2 In the unfolded state shown, the underwear has a "longitudinal direction" and a "transverse direction" that are orthogonal to each other. The "longitudinal direction" is along the vertical direction of the underwear shape, and the "transverse direction" is along the left and right direction of the underwear shape.

[0058] The sanitary napkin 1 of this embodiment includes: a liquid-absorbing absorbent body 10 for absorbing liquids such as menstrual blood; and a waist member 20 arranged on the non-skin side of the absorbent body 10 and arranged on the waist of the wearer when the sanitary napkin 1 is worn.

[0059] (Absorbent body 10)

[0060] Figure 4 1 and 2 are a top view and a cross-sectional view of the absorbent body 10. Figure 2 As shown in FIG. 1 , the absorbent body 10 of this embodiment is a generally rectangular shape when viewed from above, with the longitudinal direction (i.e., the long side direction of the absorbent body 10) being along the vertical direction of the sanitary napkin 1. Figure 3 and Figure 4 As shown, the absorbent body 10 has an absorbent core 11 along the longitudinal direction (up and down direction), a top sheet 12 arranged at a position closer to the skin side than the absorbent core 11, a second sheet 13 arranged between the top sheet 12 and the absorbent core 11, a bottom sheet 14 arranged at a position closer to the non-skin side than the absorbent core 11, and a side sheet 15 arranged on the non-skin side of the bottom sheet 14.

[0061] Absorbent core 11 is a member for absorbing liquids such as urine and is formed by liquid-absorbent fibers such as pulp fibers mixed with superabsorbent polymer (SAP). In addition, absorbent core 11 can also be covered by liquid-permeable sheet members (core wrapping sheets) such as tissue paper and nonwoven fabrics.

[0062] The top sheet 12 is a liquid-permeable sheet member that can come into contact with the wearer's skin when worn, and is formed of, for example, a hydrophilic air-through nonwoven fabric, a spunbond nonwoven fabric, or the like. Figure 4 As shown in the cross-sectional view, the two side ends of the top sheet 12 in the left and right directions are folded back from the skin side to the non-skin side in the thickness direction on both outer sides of the absorbent core 11 in the left and right directions, so as to be sandwiched between the absorbent core 11 and the back sheet 14.

[0063] The second sheet 13 is a sheet member having substantially the same function and structure as the top sheet 12, and is laminated on the non-skin side of the top sheet 12. In addition, the second sheet 13 may not necessarily be provided in the absorbent body 10.

[0064] The back sheet 14 is a breathable and liquid-impermeable sheet member for suppressing leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside, and is formed of, for example, a resin film.

[0065] The side sheet 15 is a sheet member laminated on the non-skin side of the back sheet 14 and is made of, for example, a flexible nonwoven fabric such as an air-through nonwoven fabric.

[0066] A pair of leakage-barrier walls 30 are provided on either side of the absorbent body 10 in the left-right direction. These walls act as so-called three-dimensional gathers. When the sanitary napkin 1 is worn, the leakage-barrier walls 30 extend from either side of the absorbent body 10 toward the wearer's skin, thereby preventing menstrual blood and other excretions from leaking out of the absorbent body 10.

[0067] In this embodiment, if Figure 4 As shown in the cross-sectional view, the side sheet 15 extends outwardly from the left and right directions (lateral directions) of the absorbent core 11, and is bent toward the skin side in the thickness direction at both ends of the absorbent body 10 in the left and right directions, and the end 15t is arranged at a position closer to the skin side than the absorbent core 11. The end 15t is joined to the skin side of the top sheet 12 by the front side joining portion 32f at the front side (ventral side) end in the longitudinal direction, and is joined to the skin side of the top sheet 12 by the rear side joining portion 32b at the rear side (dorsal side) end in the longitudinal direction (refer to FIG. Figure 4 ) In addition, the front side bonding portion 32f and the rear side bonding portion 32b are formed using a bonding material such as a hot melt adhesive.

[0068] In addition, at the end 15t, as Figure 4 The side panels 15 are folded back and stacked in the thickness direction, with a leak-proof wall elastic member 31 provided between the stacked side panels 15. The leak-proof wall elastic member 31 is provided in a longitudinally (vertically) stretched state and secured at both longitudinal ends by the front and rear joining portions 32f and 32b, thereby exhibiting longitudinal (vertically) stretchability between the front and rear joining portions 32f and 32b. When the sanitary napkin 1 is worn, the stretchability exhibited by the leak-proof wall elastic member 31 causes the end 15t of the leak-proof wall portion 30 to contract longitudinally (vertically), causing the free end of the end 15t to rise toward the wearer's skin. The elongation ratio of the leak-proof wall elastic member 31 provided in the leak-proof wall portion 30 is preferably set to approximately 2.2 to 2.6 times. The stretch ratio is represented by a value obtained by dividing the length of the elastic member (leakage preventing wall elastic member 31 ) in the stretched state by the length of the elastic member (leakage preventing wall elastic member 31 ) in the natural state.

[0069] In addition, the absorbent body 10 is provided with a high-density portion 40 in which 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 various members constituting the absorbent body 10 in the thickness direction. Figure 4 As shown, the high-density portion 40 of this embodiment includes a first high-density portion 41, a second high-density portion 42, and a third high-density portion 43, each formed into a linear shape by arranging a plurality of dot-shaped compressions. The provision of such a high-density portion 40 prevents the liquid-absorbent fibers of the absorbent core 11 from spreading out and collapsing. Furthermore, when the sanitary napkin 1 is worn, the high-density portion 40 serves as a starting point for bending, allowing the absorbent core 11 to easily deform three-dimensionally to conform to the wearer's body shape, thereby facilitating conformation to the wearer's body.

[0070] In addition, the absorbent body 10 is provided with a plurality of absorbent elastic members 50 that are stretchable in the longitudinal direction (vertical direction). The absorbent elastic members 50 are formed, for example, of rubber bands and are arranged at a position closer to the non-skin side than the absorbent core 11 (specifically, between the back sheet 14 and the side sheets 15) in a state of being stretched in the longitudinal direction (vertical direction). In the sanitary napkin 1 of this embodiment, as shown in FIG. Figure 4 As shown, five absorbent elastic members 50 are provided at predetermined intervals in the left-right direction. The stretch ratio of the absorbent elastic members 50 is preferably set to approximately 2.7 to 3.2 times. By setting the stretch ratio of the absorbent elastic members 50 higher than that of the leakage-barrier elastic members 31, the absorbent body 10 easily contracts from the non-skin side in the thickness direction, allowing the absorbent body 10 to conform to the wearer's body when the sanitary napkin 1 is worn. In other words, the elasticity of the absorbent elastic members 50 facilitates close contact between the absorbent body 10 and the wearer's crotch, preventing leakage of menstrual blood and other excretions.

[0071] In the following, the absorber elastic members 50 arranged on the outermost sides in the left-right direction are referred to as first elastic members 51, 51. Furthermore, the absorber elastic members 50 arranged adjacent to and inward of the first elastic members 51, 51 in the left-right direction are referred to as second elastic members 52, 52. Furthermore, the absorber elastic member 50 arranged inward of the second elastic member 52 in the left-right direction is referred to as third elastic member 53. The absorber elastic member 50 only needs to include a pair of first elastic members 51, 51 and a pair of second elastic members 52, 52. That is, the number of third elastic members 53 may be two or more, or zero.

[0072] (waist member 20)

[0073] The waist member 20 is composed of a plurality of sheet members, and in this embodiment, includes a non-skin side sheet 21 and skin side sheets 22, 23 (see Figure 3 ). In addition, in the following description, the portion of the waist member 20 that is closer to the front side (ventral side) than the central position CL in the longitudinal direction is also referred to as the front waist member 20f, and the portion that is closer to the rear side (dorsal side) than the central position CL is also referred to as the rear waist member 20b.

[0074] The non-skin side sheet 21 is a non-stretchable sheet member disposed on the non-skin side of the sanitary napkin 1 and is formed of, for example, spunbond nonwoven fabric, SMS nonwoven fabric, etc. Figure 2 As shown in a plan view of the non-skin side sheet 21, the central portion in the longitudinal direction (a portion including the central position CL) has a shape that is necked inward in the left-right direction.

[0075] 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, for example, of a stretchable non-woven fabric. "Stretchable non-woven fabric" refers to a non-woven fabric that contains stretchable stretch fibers and elongation fibers having a lower shrinkage than the stretch fibers, and to which an appropriate stretching treatment such as gear stretching is applied. For the skin side sheet 22 of this embodiment, as the stretch fiber, a fiber of a polyurethane elastomer that is a type of elastic thermoplastic elastomer can be used, and as the elongation fiber, a fiber of a polyolefin resin (PP) that is a type of inelastic thermoplastic resin can be used.

[0076] The skin side sheet 22 is formed by a plurality of sheet joints 60 (see Figures 6B to 6C ) is joined with the non-skin side sheet 21, thereby giving the front waist member 20f at least stretchability along the left and right directions. In this embodiment, the sheet joint portion 60 is formed using known joining means such as ultrasonic welding.

[0077] The skin side sheet 23 is a stretchable sheet member that is laminated on the skin side of the non-skin side sheet 21 on the back side (back side) in the longitudinal direction. 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 a stretchable nonwoven fabric and is formed by a plurality of sheet joints 60 (see Figures 6B to 6C ) is joined to the non-skin side sheet 21. Thus, stretchability in at least the left-right direction is imparted to the rear waist member 20b.

[0078] Sanitary napkin 1 Figure 2 The expanded state shown is taken from the center position CL in the longitudinal direction of the absorbent body 10 (at Figure 2 The absorbent body 10 and the waist member 20 are folded in half along the longitudinal direction (front-to-back direction) at the bending position (indicated by a single dotted line). In this folded state, the two transverse (left-right) end portions 20fe, 20fe of the front waist member 20f overlapping in the front-to-back direction and the two transverse (left-right) end portions 20be, 20be of the rear waist member 20b are joined using known joining means such as sealing welding to form a side joint portion 20we. As a result, the folded waist member 20 (20f and 20b) is connected in a ring shape at the front side (ventral side) and the rear side (dorsal side), forming a Figure 1 The sanitary napkin 1 has a waist opening 1a and a pair of leg openings 1b as shown, forming a panty-type sanitary napkin 1.

[0079] <About the Fit of Sanitary Napkin 1>

[0080] Next, the fit of the sanitary napkin 1 when worn will be described. Figure 5A This is a diagram illustrating the fit of a conventional sanitary napkin as a comparative example. Figure 5B These are diagrams explaining the fit of the sanitary napkin 1 according to this embodiment when worn.

[0081] exist Figure 5A The sanitary napkin of the comparative example shown includes an absorbent body 100. The structure of the absorbent body 100 of the comparative example is substantially the same as that of the absorbent body 10 of the present embodiment, but the structure of the absorbent elastic members 50 differs from that of the absorbent body 10. Specifically, in the absorbent body 100 of the comparative example, three absorbent elastic members 50 are provided in the region between the pair of high-density portions 40, 40 in the left-right direction, while no elastic member, equivalent to the first elastic member 51 of the present 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 member 50 is provided in the regions on either side in the left-right direction. Furthermore, the absorbent body 100 does not necessarily need to include the high-density portions 40.

[0082] When a sanitary napkin having the absorbent body 100 of the comparative example is worn, the absorbent elastic member 50 contracts in the region (central portion in the horizontal direction) inward of the pair of high-density portions 40, 40 in the absorbent body 100, thereby lifting the absorbent core 11 toward the wearer's skin. Figure 5A Thus, the left-right center portion of the absorbent core 11 is deformed to convexly face the wearer's skin and to come into close contact with the vaginal opening or other excretion openings, thereby efficiently absorbing menstrual blood or the like in the crotch portion.

[0083] On the other hand, the absorbent body 100 of the comparative example lacks the absorbent elastic members 50 in the areas outside the pair of high-density portions 40, 40 in the left-right direction (on both sides in the left-right direction). Therefore, the contractile force generated by the absorbent elastic members 50 is not applied in these areas, making it difficult for the absorbent core 11 to conform to the wearer's body. In other words, the absorbent core 11 is unlikely to come into close contact with the areas on both sides of the excretion opening. Consequently, high-viscosity fluids such as menstrual blood may leak laterally from the wearer's groin area along the wearer's legs.

[0084] On the other hand, in the case of the sanitary napkin 1 of this embodiment, the region (the center portion in the left-right direction) inward of the pair of high-density portions 40, 40 in the absorbent body 10 is easily attached to the wearer's vaginal opening as in the comparative example. That is, the second elastic member 52 (and the third elastic member 53) contract, so that Figure 5B When viewed from the front side in the front-back direction, the center portion of the absorbent core 11 in the left-right direction is bent so as to be raised toward the wearer's skin. That is, the area provided with the second elastic member 52 is deformed so as to be convex toward the skin side, making it easy to come into close contact with an excretion opening such as the vaginal opening.

[0085] Furthermore, the first elastic members 51, 51 contract in the areas (lateral sides) located laterally outward of the pair of high-density portions 40, 40, thereby bending the lateral sides of the absorbent core 1 so that they are raised toward the wearer's skin. In other words, the areas provided with the first elastic members 51, 51 are deformed to become convex toward the skin, thereby facilitating contact with the wearer's groin. Therefore, even if excreta such as menstrual blood flows laterally along the wearer's legs, it is reliably absorbed by the absorbent core 11 in the groin area, thereby preventing side leakage.

[0086] In the absorbent body 10 of this embodiment, a high-density portion 40 is arranged between the first elastic member 51 and the second elastic member 52 in the left-right direction. Therefore, if the absorbent elastic member 50 (51, 52) contracts, the high-density portion 40 becomes a bending starting point, and the absorbent core 11 is easily deformed three-dimensionally. That is, the area on the inside of the high-density portion 40 in the left-right direction is easily deformed by the contraction of the second elastic member 52 toward the wearer's excretion port, and the area on the outside of the high-density portion 40 in the left-right direction is easily deformed by the contraction of the first elastic member 51 toward the wearer's groin (see FIG. Figure 5B ).

[0087] As described above, in the sanitary napkin 1, the high-density portion 40 serves as the folding point, and the left-right central portion, where the second elastic member 52 is disposed, and the left-right side portions, where the first elastic member 51 is disposed, are each lifted toward the wearer's crotch, closely contacting the wearer's skin. Consequently, the fit of the napkin to the wearer's crotch is improved, both toward the excretion opening (vaginal opening) in the left-right central portion and toward the groin area on the left-right side portions, thereby preventing leakage of menstrual blood and other excretions.

[0088] In addition, if Figure 4 As shown, in the longitudinal direction of the sanitary napkin 1 (absorbent body 10), the length Lb50 of the portion where the contraction force generated by the absorbent elastic member 50 acts in the area behind the central position CL is longer than the length Lf50 of the portion where the contraction force generated by the absorbent elastic member 50 acts in the area in front of the central position CL (Lb50>Lf50). That is, the magnitude of the contraction force acting on the position behind the folding line (central position CL in the longitudinal direction) when the sanitary napkin 1 is folded in half front to back is greater than the magnitude of the contraction force acting on the position in front of the folding line (central position CL) (ventral side). Therefore, when the sanitary napkin 1 is worn, the absorbent body 10 fits more easily on the back side (buttocks side) of the wearer. As a result, for example, when the wearer is sitting or lying on his back, it is possible to effectively prevent menstrual blood discharged from the excretion opening from moving obliquely to the rear along the wearer's buttocks and leaking to the outside of the sanitary napkin 1.

[0089] Furthermore, at a position longitudinally rearward of the center position CL, the length Lb50 of the portion subjected to the contractile force generated by the absorbent elastic member 50 is longer than the length Lb31 of the portion subjected to the contractile force generated by the leakage-barrier elastic member 31 (Lb50>Lb31). As described above, when the sanitary napkin 1 is worn, the elasticity of the leakage-barrier elastic member 31 causes the leakage-barrier wall portion 30 to rise toward the wearer's body, thereby effectively preventing lateral leakage of excreta. However, if the height of the leakage-barrier wall portion 30 is too high, a gap may form between the absorbent core 11 and the wearer's skin, making it difficult for excreta to be absorbed by the absorbent core 11.

[0090] In contrast, in the present embodiment, by setting Lb50>Lb31, the contraction force of the absorbent elastic member 50 acting on the buttocks side is increased. This makes it easier for the absorbent core 11 to come into close contact with the wearer's skin, and can prevent the leakage-proof wall portion 30 from rising too high toward the wearer's skin. Therefore, when the sanitary napkin 1 is worn, the formation of a gap (space) between the wearer's buttocks and the absorbent core 11 is prevented, and the absorbency of the excrement 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 greater than the elongation ratio of the leakage-proof wall elastic member 31, so the contraction force of the absorbent elastic member 50 becomes greater, making it more difficult to form a gap (space).

[0091] Furthermore, the high-density portion 40 (third high-density portion 43) has a rear convex portion 43c (see FIG. 1 ) whose rear end portion is convex toward the rear at a position rearward of the fold line (center position CL). Figure 4 ). When the sanitary napkin 1 is worn, the rear convex portion 43c is arranged so that the upper end portion on the rear side (dorsal side) relative to the fold line extends from the outside to the inside in the left-right direction, and from the lower side to the upper side in the top-down direction. In the area where the rear convex portion 43c is arranged, the three-dimensional deformation of the absorbent core 11 as described above can be easily suppressed by the rear convex portion 43c extending obliquely, and the absorbent core 11 can easily come into close contact with the wearer's body while maintaining its flat shape. The area where the rear convex portion 43c is arranged is located along the wearer's sacrum when the sanitary napkin 1 is worn, so that the absorbent core 11 can be flatly attached to the vicinity of the wearer's sacrum.

[0092] Furthermore, first elastic members 51, 51 are positioned laterally outward from the outer end of the rear convex portion 43c. This allows the first elastic members 51 to stretch both sides of the rear convex portion 43c, maintaining the rear end region of the absorbent core 11 in a flat shape. This allows the two sides of the absorbent core 11 to fit the wearer's buttocks along the sides of the sacrum. This makes it easier to prevent leakage of menstrual blood and the like from the buttocks.

[0093] Figures 6A to 6C This is a diagram for explaining the sheet joining portion 60 that joins the non-skin side sheet 21 and the skin side sheets 22 and 23 of the waist member 20 . Figure 6A The types and configurations of the sheet joints 60 formed in the waist member 20 in the expanded and stretched state are shown. In this embodiment, two types of sheet joints 60 are used to join the non-skin side sheet 21 and the skin side sheets 22, 23 to each other. Specifically, in the area B shown by the oblique line, Figure 6B The plurality of first sheet joints 61 shown join the non-skin side sheet 21 and the skin side sheets 22, 23 in a state of being stacked in the thickness direction. Figure 6C The plurality of second sheet joining portions 62 shown join the non-skin side sheet 21 and the skin side sheets 22 and 23 in a state where they are stacked in the thickness direction.

[0094] As described above, each sheet joint portion 60 (61, 62) is formed by joining means such as ultrasonic welding. Such thin sheet joint portions 60 are spread over the entire waist member 20, so that the waist member 20 can maintain good softness and elasticity, and can also ensure sufficient strength.

[0095] In addition, in the present embodiment, it is preferred that the total area of ​​the first sheet joint 61 per unit area formed in region B (the area ratio of the first sheet joint 61) is larger than the total area of ​​the second sheet joint 62 per unit area formed in regions C and D (the area ratio of the second sheet joint 62). That is, it is preferred that the rigidity of the waist member 20 is higher in region B than in regions C and D.

[0096] When the absorbent body 10 is stacked and attached to the waist member 20 and viewed in the thickness direction, Figure 6A The region C shown is located inside the pair of high-density portions 40, 40 in the left-right direction. Figure 5BAs described in the figure, the area where the absorbent core 11 is deformed convexly toward the wearer's skin side is formed. Therefore, compared with area B, the rigidity of the waist member 20 is lower in area C, so that it is difficult to hinder the elasticity of the waist member 20 in this area, and when the sanitary napkin 1 is worn, it is easy to maintain the state of the absorbent body 10 in contact with the wearer's crotch. On the other hand, in area B, which is located on the outside of the pair of high-density parts 40, 40 in the left-right direction, the rigidity is easy to be higher than that of area C. Therefore, the rigidity of the absorbent body 10 is easy to be maintained as the entire area B, and when the sanitary napkin 1 is worn, it is possible to prevent the absorbent body 10 from being compressed in the left-right direction (so-called shrinkage) and deteriorating the fit. In addition, area C has low rigidity and is easy to expand and contract compared to area B. Therefore, even if the body moves due to turning over, etc., it is easy to maintain the state of the absorbent body 10 in contact with the gluteal groove. As a result, it is possible to prevent menstrual blood from leaking along the skin in the gap between the buttocks.

[0097] In addition, in the sanitary napkin 1, the region C is provided near the rear side in the longitudinal direction. In other words, the area of ​​the portion of the region C that is closer to the rear side than the central position CL in the longitudinal direction is larger than the area of ​​the portion of the region C that is closer to the front side than the central position CL (see Figure 6A ). That is, the rigidity of the rear side (dorsal side) of the waist member 20 in the longitudinal direction is lower than that of the front side (ventral side). Therefore, when the sanitary napkin 1 is worn, the rear side (dorsal side) area of ​​the waist member 20 is easy to deform. With such a structure, when the wearer uses it in a lying position at night, even if the wearer turns over, the front side is easy to maintain its deformed shape. In addition, the rigidity of the rear side is reduced, making it difficult to hinder the longitudinal (up and down) expansion and contraction of the absorbent elastic member 50, so the absorbent body 10 is easy to follow the wearer's gluteal groove. Moreover, the rear side (dorsal side) of the waist member 20 is also easy to shrink in the left and right direction, so even if the wearer turns over, it is easy to maintain a fit state against the buttocks.

[0098] Figure 7 1 is a diagram illustrating a bottom joint portion 70 for joining the back sheet 14 and the side sheet 15 in the absorbent body 10. Figure 4 As also described in the , the back sheet 14 and the side sheets 15 are stacked in the thickness direction at a position closer to the non-skin side than the absorbent core 11. In addition, the back sheet 14 and the side sheets 15 are joined to each other via the bottom joint 70 with the absorbent elastic member 50 in the stretched state sandwiched therebetween. Figure 7 As shown, the bottom joint portion 70 is formed by arranging a plurality of joint materials such as hot melt adhesive applied in thin strips in the longitudinal direction (vertical direction) at predetermined intervals in the horizontal direction.

[0099] If the Figure 7As shown, in the left-right direction, two strip-shaped bottom joints 70, 70 are arranged between the first elastic member 51 and the second elastic member 52, and one strip-shaped bottom joint 70 is arranged between the second elastic member 52 and the third elastic member 53. That is, in this embodiment, the area of ​​the bottom joint 70 per unit area in the region between the first elastic member 51 and the second elastic member 52 is larger than the area of ​​the bottom joint 70 per unit area in the region between the second elastic member 52 and the third elastic member 53. With this structure, the back sheet 14 and the side sheet 15 are more firmly joined in the region between the first elastic member 51 and the second elastic member 52 than in the region between the second elastic member 52 and the third elastic member 53, thereby improving the rigidity of the absorbent body 10.

[0100] 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. This region is the starting point for the bending of the absorbent body 10 when the absorbent body 10 is deformed three-dimensionally when the sanitary napkin 1 is worn. Therefore, the rigidity of the absorbent body 10 is increased in this region, making it easier for the absorbent body 10 (absorbent core 11) to form a habitual bend. Figure 5B Thus, the absorbent body 10 can be easily kept in close contact with the crotch of the wearer, thereby improving the absorbency of menstrual blood and the like and suppressing leakage.

[0101] In addition, if Figure 2 As shown, in the sanitary napkin 1, the lower end 20web of the side joint 20we (ends 20fe) formed on the front waist member 20f is positioned higher in the vertical direction than the upper end 50fu of the front side of the absorbent elastic member 50. That is, the side joint 20we (ends 20fe) of the front waist member 20f does not overlap with the absorbent elastic member 50 in the vertical direction. Therefore, when the sanitary napkin 1 is worn, even if the front waist member 20f deforms in response to the wearer's body (ventral) movements when the wearer bends forward or moves their legs forward, the effects of this deformation are less likely to propagate to the absorbent elastic member 50. Consequently, when the wearer moves, the absorbent body 10 is prevented from shifting in tandem with the movement of the front waist member 20f, making it easier to maintain a good fit of the absorbent body 10. This makes it easier to prevent leakage of menstrual blood, etc.

[0102] Figure 8 1 is a diagram illustrating a main body joint portion 80 for attaching and joining the absorbent main body 10 to the waist member 20. In the sanitary napkin 1, the non-skin side of the absorbent main body 10 (the non-skin side of the side sheet 15) and the skin side of the waist member 20 are joined by Figure 8The main body joint portions 80 shown by the slanted portions are joined to each other. The main body joint portions 80 are formed using a joining material such as a hot melt adhesive.

[0103] In the sanitary napkin 1 of the present embodiment, the width of the main body joint portion 80 in the left - right direction is larger at both longitudinal ends (the upper end portion in the up - down direction) than at the longitudinal center portion (the crotch portion). That is, the main body joint portion 80 has a portion with a width W70a in the left - right direction at the front and rear longitudinal ends (the front upper end portion and the rear upper end portion in the panty - type state), and has a portion with a width W70b narrower than W70a (W70a > W70b) between the front longitudinal end and the rear longitudinal end (the lower end portion in the panty - type state). According to such a structure, at both longitudinal ends, the absorbent main body 10 is joined to the waist member 20 over a large area, and the absorbent main body 10 is not easily distorted or deformed. Thus, on the abdomen and buttocks of the wearer, the absorbent main body 10 is easily planar and conforms over a large area. On the other hand, at the longitudinal center portion (the crotch portion), the portion where the absorbent main body 10 is joined to the waist member 20 is narrow. Accordingly, the absorbent main body 10 is easily deformed. Thus, the stiffness near the crotch portion of the wearer of the absorbent main body 10 is not too strong, the absorbent main body 10 is easily deformed, and the situation where the side edges of the absorbent main body 10 press against the groin portion of the wearer when wearing the sanitary napkin 1 and cause discomfort can be suppressed. In this way, the absorbent main body 10 is easily and appropriately conformable to the wearer's body (ventral part, crotch portion, buttocks) as a whole, and leakage of menstrual blood and the like is easily suppressed.

[0104] In addition, 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 main body joint portion 80 in the left - right direction (W51 < W70). The side sheets 15 constituting the leakage - preventing wall portion 30 are joined to the waist member 20 by the main body joint portion 80. Therefore, when the leakage - preventing wall portion 30 stands up toward the skin side, the side sheets 15 can be bent toward the skin side with both ends in the left - right direction of the main body joint portion 80 as boundaries. That is, both ends in the left - right direction of the main body joint portion 80 are positions that become the starting points of standing up when the leakage - preventing wall portion 30 stands up toward the skin side. Thus, by setting W51 < W70, it is difficult for the contraction force generated by the first elastic members 51, 51 to act at the starting point of standing up of the leakage - preventing wall portion 30, and it is difficult to hinder the deformation (standing up) of the leakage - preventing wall portion 30.

[0105] In addition, 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 it is assumed that the interval W51 between the first elastic members 51, 51 is 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 both side portions become wide. In this case, it is difficult for the absorbent core 11 to form Figure 5B The convex shape described above makes it difficult for the central portion of the absorbent core 11 in the horizontal direction to fit the excretion opening. Furthermore, even if the first elastic member 51 contracts, the left and right sides of the absorbent core 11 will not be sufficiently lifted, making it difficult for the absorbent core 11 to fit the wearer's groin. In contrast, by making the spacing W51 between the first elastic members 51, 51 greater than 1 / 2 of the width W11 of the absorbent core 11, it is easier to appropriately convexly deform the absorbent core 11, thereby facilitating good fit.

[0106] In addition, the high-density portion 40 of this embodiment does not overlap with the folding line (the center position CL in the longitudinal direction) when the sanitary napkin 1 is folded in the front-back direction. Figure 4 In the sanitary napkin 1, the central position CL is arranged between the second high-density portion 42 and the third high-density portion 43 in the longitudinal direction. In other words, the high-density portion 40 is provided so as not to have a portion overlapping with the central position CL (the fold line) in the longitudinal direction. The high-density portion 40 is discontinuous in the longitudinal direction across the fold line. Therefore, when the sanitary napkin 1 is worn, the movement of the ventral side and the movement of the dorsal side are difficult to be linked, and the absorbent body 10 is easy to deform independently in each area. Therefore, the ventral side and the dorsal side of the absorbent body 10 are easy to follow the movement of the wearer's body, respectively, and the fit can be further improved. As a result, the leakage of menstrual blood and the like can be easily suppressed.

[0107] In addition, the high-density portion 40 of the sanitary napkin 1 has a reverse portion 40r that is reversed to the opposite side in the longitudinal direction. Figure 4 In the embodiment, the second high-density portion 42 has a reversal portion 42r1 in which the front end portion in the longitudinal direction is reversed toward the rear side, and a reversal portion 42r2 in which the rear end portion in the longitudinal direction is reversed toward the front side. In addition, the reversal portions 42r1 and 42r2 are configured to span the first elastic member 51 in the left-right direction. That is, the reversal portions 42r1 and 42r2 have portions that intersect with the first elastic member 51. In the portions where the reversal portions 42r1 and 42r2 intersect with the first elastic member 51, under the influence of the reversal portions 42r1 and 42r2, the contraction force generated by the first elastic member 51 is difficult to act on the absorbent core 11. Therefore, by adjusting the configuration of the reversal portion 40r, the deformation of the absorbent core 11 can be locally controlled. For example, in Figure 4 In this case, the contraction force generated by the first elastic member 51 is weakened between the inversion portion 42r1 and the inversion portion 42r2, so that the absorbent core 11 is more likely to maintain a flat shape in this region than in other regions. This makes it easier for the absorbent core 11 to fit along the plane of the wearer's abdomen.

[0108] ===Others===

[0109] The above embodiments are for the purpose of making the present invention easier to understand and are not intended to limit the present invention. The present invention can be modified and improved without departing from the spirit and scope of the present invention, and the present invention naturally includes equivalents.

[0110] In the above embodiment, a sanitary napkin 1 is described as an example of a panty-type absorbent article. However, the present invention is also applicable to absorbent articles other than sanitary napkins. For example, a panty-type absorbent article may be a diaper or absorbent pad for children or adults.

[0111] In the above embodiment, as the skin side sheets 22 and 23 constituting the waist member 20, stretchable sheets such as stretchable nonwoven fabrics are used to impart stretchability in the left-right direction to the waist member 20. However, other stretchable members may be provided in the waist member 20. For example, Figure 2 In this way, waist elastic members 25 such as rubber bands are provided at the upper ends of the front waist member 20f and the rear waist member 20b in a manner that can be stretched and contracted in the left-right direction. By providing such waist elastic members 25, the fit of the waist opening 1b is further improved, and the positional deviation of the waist member 20 can be suppressed when the sanitary napkin 1 is worn.

[0112] In addition, when the waist elastic member 25 is provided on the waist member 20, it is preferable that at least a portion of the waist elastic member 25 is configured to overlap with the skin side panels 22, 23. By doing so, the elasticity in the left and right directions of the waist elastic member 25 and the elasticity in the left and right directions of the skin side panels 22, 23 are linked together, 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-down direction, a left-right direction, and a front-back direction intersecting each other, The panty-type sanitary napkin comprises: an absorbent body having a liquid-absorbing absorbent core; and a waist member arranged to overlap with the non-skin side of the absorbent body, characterized in that: A plurality of elastic members that stretch in the vertical direction are provided at predetermined intervals in the horizontal direction at a position closer to the non-skin side than the absorbent core of the absorbent body. The elastic member includes a first elastic member disposed on the outermost side and a second elastic member disposed adjacent to the first elastic member and on the inner side of the first elastic member, respectively, on both sides in the left-right direction. The absorbent body has a high-density portion in which the density of the absorbent core is higher than that of surrounding portions at least in a region between the first elastic member and the second elastic member in the left-right direction. The waist member includes at least a skin side sheet and a non-skin side sheet laminated on the non-skin side of the skin side sheet. The panty-type sanitary napkin has a sheet joining portion for joining the skin side sheet and the non-skin side sheet. In the region where the absorbent body and the waist member overlap when viewed in the thickness direction, The total area of ​​the sheet joints per unit area formed in the region inside the high-density portion in the left-right direction is smaller than the total area of ​​the sheet joints per unit area formed in the region outside the high-density portion in the left-right direction.

2. The panty-type sanitary napkin according to claim 1, characterized in that: The panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half along the front-back direction. The length of the portion where the contraction force of the elastic member acts on the rear side of the folding line is longer than the length of the portion where the contraction force of the elastic member acts on the front side of the folding line.

3. The panty-type sanitary napkin according to claim 2, characterized in that: A pair of leakage-proof walls are provided on both sides of the absorbent body in the left-right direction. The leakage-proof wall portion has a leakage-proof wall elastic member that is stretchable along the vertical direction. At least at a position rearward of the folding line, the length of the portion on which the contraction force of the elastic member acts is longer than the length of the portion on which the contraction force of the leakage preventing wall elastic member acts.

4. The panty-type sanitary napkin according to claim 2 or 3, characterized in that: The high-density portion has a rear convex portion extending from the outside toward the inside in the left-right direction and from the bottom toward the top in the up-down direction at an upper end portion rearward of the folding line. The first elastic member is located outward of an outer end of the rear convex portion in the left-right direction.

5. The panty-type sanitary napkin according to claim 4, characterized in that: The region where the absorbent body and the waist member overlap when viewed in the thickness direction is located inward of the high-density portion in the left-right direction. The total area of ​​the sheet joints per unit area formed in the area behind the folding line when the underwear-type sanitary napkin is folded in the front-to-back direction is smaller than the total area of ​​the sheet joints per unit area formed in the area frontward of the folding line.

6. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The absorbent body includes a liquid-impermeable backsheet disposed on the non-skin side relative to the absorbent core, and a side sheet laminated on the non-skin side of the backsheet. The panty-type sanitary napkin has a bottom joint portion for joining the bottom sheet and the side sheets. A third elastic member is provided adjacent to the second elastic member and disposed inside the second elastic member in the left-right direction. In the left-right direction, the total area of ​​the bottom joints formed per unit area in the region between the first elastic member and the second elastic member is larger than the total area of ​​the bottom joints formed per unit area in the region between the second elastic member and the third elastic member.

7. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The waist member includes a front waist member and a rear waist member. The front waist member and the rear waist member are connected to each other by side joints at both ends in the left-right direction. The lower end of the side joint is located higher than the upper end of the first elastic member at a position forward of a folding line when the pull-on sanitary napkin is folded in half in the front-to-back direction.

8. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The panty-type sanitary napkin has a main body joint portion for joining the absorbent main body to the skin side of the waist member. In the left-right direction, the distance between 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 joining portion.

9. The panty-type sanitary napkin according to claim 8, characterized in that: The width of the main body joint portion at an upper end portion in the up-down direction is greater than the width of the main body joint portion at a lower end portion in the up-down direction.

10. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that The panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half along the front-back direction. The high-density portion does not overlap the folding line.

11. The panty-type sanitary napkin according to any one of claims 1 to 3, characterized in that: The high-density portion includes an inverted portion in which a portion of the region is inverted to the opposite side in the vertical direction. The inverted portion has a portion intersecting with the first elastic member.

12. A panty-type sanitary napkin having an up-down direction, a left-right direction, and a front-back direction intersecting each other, The panty-type sanitary napkin comprises: an absorbent body having a liquid-absorbing absorbent core; and a waist member arranged to overlap with the non-skin side of the absorbent body, characterized in that: A plurality of elastic members that stretch in the vertical direction are provided at predetermined intervals in the horizontal direction at a position closer to the non-skin side than the absorbent core of the absorbent body. The elastic member includes a first elastic member disposed on the outermost side and a second elastic member disposed adjacent to the first elastic member and on the inner side of the first elastic member, respectively, on both sides in the left-right direction. The absorbent body has high-density portions on both sides in the left-right direction, where the density of the absorbent core is higher than that of surrounding portions. When viewed in the front-back direction, the region where the first elastic member is disposed and the region where the second elastic member is disposed in the absorbent body are each convex toward the wearer's skin. The waist member includes at least a skin side sheet and a non-skin side sheet laminated on the non-skin side of the skin side sheet. The panty-type sanitary napkin has a sheet joining portion for joining the skin side sheet and the non-skin side sheet. In the region where the absorbent body and the waist member overlap when viewed in the thickness direction, The total area of ​​the sheet joints per unit area formed in the region inside the high-density portion in the left-right direction is smaller than the total area of ​​the sheet joints per unit area formed in the region outside the high-density portion in the left-right direction.

13. The panty-type sanitary napkin according to claim 12, characterized in that: The panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half along the front-back direction. The length of the portion where the contraction force of the elastic member acts on the rear side of the folding line is longer than the length of the portion where the contraction force of the elastic member acts on the front side of the folding line.

14. The panty-type sanitary napkin according to claim 13, characterized in that: A pair of leakage-proof walls are provided on both sides of the absorbent body in the left-right direction. The leakage-proof wall portion has a leakage-proof wall elastic member that is stretchable along the vertical direction. At least at a position rearward of the folding line, the length of the portion on which the contraction force of the elastic member acts is longer than the length of the portion on which the contraction force of the leakage preventing wall elastic member acts.

15. The panty-type sanitary napkin according to claim 13 or 14, characterized in that: The high-density portion has a rear convex portion extending from the outside toward the inside in the left-right direction and from the bottom toward the top in the up-down direction at an upper end portion rearward of the folding line. The first elastic member is located outward of an outer end of the rear convex portion in the left-right direction.

16. The panty-type sanitary napkin according to claim 15, characterized in that: The region where the absorbent body and the waist member overlap when viewed in the thickness direction is located inward of the high-density portion in the left-right direction. The total area of ​​the sheet joints per unit area formed in the area behind the folding line when the underwear-type sanitary napkin is folded in the front-to-back direction is smaller than the total area of ​​the sheet joints per unit area formed in the area frontward of the folding line.

17. The panty-type sanitary napkin according to any one of claims 12 to 14, characterized in that: The absorbent body includes a liquid-impermeable backsheet disposed on the non-skin side relative to the absorbent core, and a side sheet laminated on the non-skin side of the backsheet. The panty-type sanitary napkin has a bottom joint portion for joining the bottom sheet and the side sheets. A third elastic member is provided adjacent to the second elastic member and disposed inside the second elastic member in the left-right direction. In the left-right direction, the total area of ​​the bottom joints formed per unit area in the region between the first elastic member and the second elastic member is larger than the total area of ​​the bottom joints formed per unit area in the region between the second elastic member and the third elastic member.

18. The panty-type sanitary napkin according to any one of claims 12 to 14, characterized in that: The waist member includes a front waist member and a rear waist member. The front waist member and the rear waist member are connected to each other by side joints at both ends in the left-right direction. The lower end of the side joint is located higher than the upper end of the first elastic member at a position forward of a folding line when the pull-on sanitary napkin is folded in half in the front-to-back direction.

19. The panty-type sanitary napkin according to any one of claims 12 to 14, characterized in that: The panty-type sanitary napkin has a main body joint portion for joining the absorbent main body to the skin side of the waist member. In the left-right direction, the distance between 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 joining portion.

20. The panty-type sanitary napkin according to claim 19, characterized in that: The width of the main body joint portion at an upper end portion in the up-down direction is greater than the width of the main body joint portion at a lower end portion in the up-down direction.

21. The panty-type sanitary napkin according to any one of claims 12 to 14, characterized in that: The panty-type sanitary napkin has a folding line when the panty-type sanitary napkin is folded in half along the front-back direction. The high-density portion does not overlap the folding line.

22. The panty-type sanitary napkin according to any one of claims 12 to 14, characterized in that: The high-density portion includes an inverted portion in which a portion of the region is inverted to the opposite side in the vertical direction. The inverted portion has a portion intersecting with the first elastic member.

Images