absorbent articles

Abstract

To provide an absorbent article which can be fixed to an underwear or the like, and suppress a skin of a wearer from being rubbed against the absorbent article.SOLUTION: An absorbent article has: a liquid permeable top sheet; a liquid impermeable back sheet; and an absorber arranged between the top sheet and the back sheet. The back sheet has: an external sheet; and an internal sheet arranged on the top sheet side of the external sheet. A fixing member is provided on an external surface side of the back sheet. An interlayer between the external sheet and the internal sheet is configured so that an area ratio of a junction area where the external sheet and the internal sheet are joined is 40% or greater, and in the interlayer, in at least a part of an area overlapped to the fixing member in a thickness direction, there is provided a deviation margin area where the external sheet and the internal sheet are not joined.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an absorbent article, and more particularly to a technique for reducing chafing when worn. [Background technology]

[0002] Absorbent articles such as sanitary napkins and incontinence pads are provided with fixing means on the outer surface side of the backsheet to prevent the articles from shifting from their worn position when worn. Such absorbent articles are described in, for example, Patent Documents 1 to 3.

[0003] Patent document 1 describes a vertically long absorbent article that is attached to underwear via an adhesive portion provided on the non-skin contact surface of the back sheet, the adhesive portion being provided on each of the front and rear longitudinal ends and both longitudinal side ends of the absorbent article, and a band of a predetermined width extending from the center of the absorbent article towards both front and rear longitudinal corners of the absorbent article and the center portion being a non-adhesive portion where no adhesive portion is present (see Patent document 1 (Claim 1)).

[0004] Patent Document 2 describes an absorbent article formed in a vertically elongated shape from a liquid-impermeable leakproof layer that contacts clothing and a liquid-retaining absorbent layer placed on this leakproof layer, in which the leakproof layer has fastening means on its back side that allows it to be attached and detached to clothing, the outer peripheral edge of the leakproof layer is joined over the entire area to the outer peripheral edge of the absorbent layer at an outer peripheral edge joining part, at least the area on the front end side of the absorbent layer that comes into contact with the wearer's vaginal opening is fixed to the leakproof layer by a fixing part, and a loose part is provided between the leakproof layer and the absorbent layer at the non-fixed part on the rear end side of the absorbent layer that is not fixed to the leakproof layer, allowing the rear end of the leakproof layer to be attached and detached to the absorbent layer (see Patent Document 2 (Claim 1)).

[0005] Patent Document 3 describes an absorbent pad having a slip-prevention part on the back surface thereof, which is made of hook tape or an adhesive layer having a large number of hook-shaped projections, and on the back surface of the absorbent pad, a slip-prevention sheet is provided, and this slip-prevention sheet has a middle part in the front-to-rear direction that is unfixed or removably fixed to the absorbent pad, a front connecting part that is located in front of this middle part and is connected to the absorbent pad, and a rear connecting part that is located behind the middle part and is connected to the absorbent pad, and the slip-prevention part is provided in the middle part, and a front perforation for separating the part between the slip-prevention part and the front connecting part, and a rear perforation for separating the part between the slip-prevention part and the rear connecting part are provided (see Patent Document 3 (Claim 1)). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-115337 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-213584 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-182930 Summary of the Invention [Problem to be solved by the invention]

[0007] Absorbent articles such as sanitary napkins and incontinence pads are used by fastening them to the wearer's underwear or disposable diaper using fastening parts. However, if the fastening force to the underwear is too strong, the movement of the underwear is directly transmitted to the absorbent article, which may cause chafing. Also, if the fastening force to the underwear is too weak, the fastening may come loose, causing the absorbent article to slip.

[0008] The present invention has been made in view of the above circumstances, and has an object to provide an absorbent article that can be fixed to underwear or the like and that can suppress chafing against the skin. [Means for solving the problem]

[0009] The absorbent article of the present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, the back sheet having an outer sheet and an inner sheet arranged on the top sheet side of the outer sheet, a fixing member being provided on the outer surface side of the back sheet, the area ratio of the joining area where the outer sheet and the inner sheet are joined between the layers of the outer sheet and the inner sheet being 40% or more, and a slippage area where the outer sheet and the inner sheet are not joined being provided between the layers in at least a part of the area overlapping with the fixing member in the thickness direction.

[0010] The absorbent article can be fixed to underwear or the like by the fixing member, and the joining region prevents the outer sheet and inner sheet constituting the back sheet from shifting, thereby preventing the absorbent body from shifting from its predetermined position when worn. Furthermore, even if the underwear or other garment to which the absorbent article is fixed moves, the amount of this movement is reduced by the deformation of the outer sheet in the slippage area, thereby reducing the movement of the absorbent article and suppressing chafing against the skin. [Effects of the Invention]

[0011] According to the present invention, an absorbent article can be obtained that can be fixed to underwear or the like and that can suppress chafing against the skin. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view of an example of an absorbent article of the present invention. [Figure 2] FIG. 2 is a rear view of the absorbent article of FIG. 1. [Figure 3] Schematic cross-sectional view of line AA in Figure 1. [Figure 4] Schematic cross-sectional view of line BB in Figure 1. [Figure 5] 1 is a schematic cross-sectional view showing the absorbent article of the present invention when worn. [Figure 6] 1 is a schematic cross-sectional view showing the absorbent article of the present invention when worn. [Figure 7] FIG. 10 is a rear view showing another example of the absorbent article of the present invention. [Figure 8] FIG. 10 is a rear view showing another example of the absorbent article of the present invention. [Figure 9] FIG. 10 is a rear view showing another example of the absorbent article of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The absorbent article of the present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The absorbent article has a front-to-rear direction y and a width direction x. The front-to-rear direction y corresponds to the direction extending from the front to the back of the user's crotch when the absorbent article is worn. The width direction x refers to a direction on the same plane as the absorbent article and perpendicular to the front-to-rear direction y, and corresponds to the left-to-right direction of the user when the absorbent article is worn. The direction perpendicular to the plane formed by the width direction x and the front-to-rear direction y is the thickness direction z. When the absorbent article is worn by a user, the side facing the user's skin is the skin-facing side, and the opposite side is the outer-facing side.

[0014] (Top sheet) The top sheet is a sheet that is positioned on the user's side when the absorbent article is worn. The material of the top sheet is not particularly limited as long as it is liquid-permeable. The shape of the top sheet in a plan view is not particularly limited, and may be adjusted depending on the shape of the absorbent body and the presence or absence of rising flaps (side sheets).

[0015] The top sheet may be a hydrophilic nonwoven fabric, woven fabric, or knitted fabric. Examples of the hydrophilic nonwoven fabric include nonwoven fabrics made from hydrophilic fibers such as cellulose, rayon, and cotton, and nonwoven fabrics made from hydrophobic fibers such as polyolefin (polypropylene, polyethylene), polyester, and polyamide, in which the surfaces of the hydrophobic fibers have been hydrophilized with a surfactant.

[0016] (back seat) The back sheet is a sheet located on the side opposite to the user, i.e., on the outside, when the absorbent article is worn. The back sheet has an outer sheet and an inner sheet located on the top sheet side of the outer sheet. The shape of the back sheet in a plan view is not particularly limited and may be adjusted according to the shape of the absorbent body.

[0017] The outer sheet and the inner sheet may be a single layer or multiple layers. Examples of the outer sheet and the inner sheet include nonwoven fabrics, woven fabrics, and knitted fabrics. The outer sheet and the inner sheet may be hydrophilic or hydrophobic, but preferably have breathability. Examples of the nonwoven fabric include nonwoven fabrics made from hydrophilic fibers such as cellulose, rayon, and cotton; and nonwoven fabrics made from hydrophobic fibers such as polyolefins (polypropylene, polyethylene), polyester, and polyamide.

[0018] At least one of the outer sheet and the inner sheet is a liquid-impermeable sheet. That is, when the outer sheet and the inner sheet are each a single layer, either the outer sheet or the inner sheet is a liquid-impermeable sheet.

[0019] The liquid-impermeable sheet may be a hydrophobic nonwoven fabric or a plastic film. Examples of the hydrophobic nonwoven fabric include nonwoven fabrics made of hydrophobic fibers such as polyolefin (polypropylene, polyethylene), polyester, and polyamide. Examples of the plastic film include films made of resins such as polyolefin (polypropylene, polyethylene), polyester, and polyamide.

[0020] The outer sheet and the inner sheet may each be a single layer or a multi-layer. Examples of the structure of the back sheet include a two-layer structure consisting of a single-layer outer sheet and a single-layer inner sheet (liquid-impermeable sheet), a three-layer structure consisting of a single-layer outer sheet and two-layer inner sheets, and a three-layer structure consisting of two-layer outer sheets and a single-layer inner sheet.

[0021] The elongation of the outer sheet is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more, and is preferably 130% or less, more preferably 120% or less, and even more preferably 110% or less. The elongation is measured at 25°C in accordance with JIS L 1913 (2010).

[0022] The basis weight of the outer sheet is preferably lower than that of the inner sheet. The lower the basis weight of the outer sheet, the more flexible the outer sheet becomes, and the greater the amount of deformation of the outer sheet in the slippage allowance region, thereby better suppressing chafing. When the outer sheet and / or the inner sheet are multi-layered, the basis weight of the outer sheet positioned closest to the skin is compared with the basis weight of the inner sheet positioned closest to the outer surface.

[0023] The weight of the outer sheet is 5 g / m 2 More preferably, 10 g / m 2 or more, and 25 g / m 2 Preferably less than 20 g / m 2 The basis weight of the inner sheet is 8 g / m or less. 2 More preferably, 13 g / m 2 or more, 28 g / m 2 Preferably less than 23 g / m 2 The following is the result.

[0024] (absorbent) The absorbent absorbs and retains body fluids. The absorbent comprises at least one water-absorbing layer. The water-absorbing layer preferably contains a water-absorbent resin powder as a water-absorbent material. The water-absorbent resin powder may be any of those conventionally used in absorbent articles.

[0025] The water-absorbing layer preferably contains a fibrous base material. The inclusion of the fibrous base material improves the shape retention of the water-absorbing layer, and the fibrous base material ensures a path for body fluids, further improving the absorption rate. Examples of the fibrous base material include absorbent fibers and heat-fusible fibers. Examples of the absorbent fibers include pulp fibers, cellulose fibers, rayon, and acetate fibers. Examples of the heat-fusible fibers include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, and composite fibers.

[0026] The absorbent body may be formed only from a water-absorbing layer, or may have a substrate. Examples of the substrate include a paper sheet such as tissue paper, a liquid-permeable nonwoven fabric sheet, etc. Examples of the absorbent body having a substrate include a form in which a water-absorbent material is fixed to the substrate, and a form in which a water-absorbent material is wrapped in the substrate and formed into a desired shape.

[0027] (fixing member) The absorbent article has a fixing member provided on the outer surface side of the backsheet. The fixing member is a member for fixing the absorbent article to the inside of a user's underwear or a disposable diaper. Examples of the fixing member include an adhesive material and a hook-and-loop fastener having a hook member.

[0028] The shape of the fixing member in a plan view is not particularly limited, but examples include a circle, an ellipse, a rectangle, a polygon, a band, and a stripe. When the fixing member is a circle, an ellipse, a rectangle, or the like, the length of the fixing member in the front-rear direction is preferably 10 mm to 50 mm or less, and the width is preferably 10 mm to 150 mm. When the fixing member is arranged in a band shape extending in the front-rear direction, the width of the fixing member is preferably 20 mm to 60 mm. The thickness of the fixing member is preferably 5 μm or more and 4000 μm or less.

[0029] The number of the fixing members is not particularly limited, and may be one or more. The positions of the fixing members are not particularly limited and may be adjusted as appropriate. The fixing members are preferably installed so as to straddle the center portion in the width direction of the backsheet.

[0030] The total area of ​​the fixing members relative to the area of ​​the back sheet is preferably 0.3% or more, more preferably 0.6% or more, and even more preferably 0.9% or more, and is preferably 32% or less, more preferably 30% or less, and even more preferably 28% or less. If the area ratio is 0.3% or more, the fixing member can be sufficiently fixed to underwear, etc., and if it is 32% or less, unintended adhesion when fixed to underwear, etc. can be suppressed.

[0031] (joint area) Between the outer sheet and the inner sheet of the back sheet, the area ratio of the bonded region where the outer sheet and the inner sheet are bonded is 40% or more. By having a bonded region of 40% or more between the layers, the outer sheet and the inner sheet that make up the back sheet are prevented from shifting. Therefore, the absorbent core, which is positioned closer to the skin than the inner sheet when worn, is prevented from shifting from its desired position.

[0032] The outer sheet and the inner sheet can be joined in the joining region by adhesive bonding, fusion bonding, etc. The adhesive is not particularly limited as long as it can join the outer sheet and the inner sheet, and examples thereof include hot melt adhesives.

[0033] The bonded regions may be provided in all areas between the layers except for the gap regions described below, or may be intermittently arranged in areas other than the gap regions between the layers. In this case, the area ratio of the bonded regions in areas other than the gap regions between the layers is preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more. When the bonded regions are arranged intermittently, the planar shape of the bonded regions may be circular, elliptical, rectangular, polygonal, striped, spiral, or the like. Note that when the bonded regions are arranged intermittently, non-bonded regions where the outer sheet and the inner sheet are not bonded exist around the bonded regions. However, because the intermittent bonded regions prevent misalignment between the outer sheet and the inner sheet, such non-bonded regions are not included in the gap regions.

[0034] When the bonded regions are arranged intermittently, the distance between the nearest bonded regions is preferably 0.9 cm or less, more preferably 0.7 cm or less, and even more preferably 0.5 cm or less. If the distance between bonded regions is 0.9 cm or less, misalignment between the outer sheet and the inner sheet is further suppressed, and the absorbent body is further prevented from shifting from its predetermined position when worn.

[0035] The area ratio of the bonded region between the layers of the backsheet is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more. The greater the area ratio of the bonded region between the layers, the more effectively the liquid-impermeable sheet and the outer sheet are prevented from slipping, and the more effectively the absorbent article is prevented from slipping.

[0036] (Displacement area) In the absorbent article, a slippage area where the outer sheet and the inner sheet are not joined is provided between the layers of the outer sheet and the inner sheet of the back sheet in at least a part of the area overlapping the fixing member in the thickness direction (hereinafter, sometimes referred to as the "fixing member area"). Within the slippage area, there is no joined area where the outer sheet and the inner sheet are joined. In other words, since the outer sheet and the inner sheet are not joined in the slippage area, the outer sheet can freely deform relative to the inner sheet. With this configuration, the movement of the outer sheet is not transmitted to the inner sheet in the slippage area. Therefore, when underwear or the like to which the absorbent article is fixed moves, even if this movement is transmitted to the outer sheet via the fixing member, the amount of movement transmitted from the outer sheet to the inner sheet is reduced. This reduces the movement of the absorbent article and suppresses chafing.

[0037] Between the layers, the slippage area is preferably provided over 50% or more of the area overlapping with the fixing member in the thickness direction. This configuration further reduces the amount of movement transmitted from the outer sheet to the inner sheet, further suppressing chafing. The slippage area is preferably provided over 70% or more of the area of ​​the fixing member area, and more preferably over 90%. Between the layers of the back sheet, the slippage area is particularly preferably provided over the entire fixing member area.

[0038] The slippage area preferably extends outward from the area between the layers that overlaps with the fixing member in the thickness direction. This configuration increases the area in which the outer sheet can deform in the direction in which the slippage area extends, thereby further suppressing chafing. The slippage area preferably extends outward over 50% or more of the periphery of the fixing member area between the layers, more preferably over 80% or more of the periphery, and even more preferably over the entire periphery.

[0039] When the slippage area extends outward in the front-to-back direction of the fixing member area, the length of the extended slippage area (the distance from the front end of the fixing member area to the front end of the extended portion, or the distance from the rear end of the fixing member area to the rear end of the extended portion) is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more, of the length of the fixing member in the front-to-back direction, taken as 100%. This configuration increases the area in which the outer sheet can deform in the front-to-back direction, thereby further reducing skin chafing. The upper limit of the length can be set as appropriate, but 100% is preferred.

[0040] When the slippage area extends outward in the width direction of the fixing member area, the length of the extended slippage area (the distance from the right edge of the fixing member area to the right edge of the extended portion, or the distance from the left edge of the fixing member area to the left edge of the extended portion) is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more, of the length of the fixing member in the width direction, taken as 100%. This configuration increases the area in which the outer sheet can deform in the width direction, thereby further reducing skin chafing. The upper limit of the length can be set as appropriate, but 100% is preferred.

[0041] The total area of ​​the offset region, including the portion provided in the fixing member region and the portion extending outward from the fixing member region, is preferably at least twice the area of ​​the fixing member, more preferably at least 4 times, and is preferably not more than 16 times, more preferably not more than 12 times, and even more preferably not more than 6 times. When multiple fixing members are arranged, the ratio of the area of ​​the fixing member to the area of ​​the offset region is calculated for each fixing member.

[0042] Between the layers of the back sheet, the area ratio of the slippage region where the outer sheet and the inner sheet are not joined is preferably 60% or less, more preferably 50% or less, and even more preferably 40% or less.

[0043] (Side seat) The absorbent article preferably has side sheets arranged on both widthwise sides of the skin-facing side of the top sheet, the side sheets being configured to be able to rise. The side sheets are configured so that their inner edges can rise from a rise base. When worn, the inner edges of the side sheets rise toward the user's skin, preventing side leakage. The side sheets are made of a liquid-impermeable plastic film, a water-repellent nonwoven fabric, or the like. The side sheets are provided with rise-up elastic members at their widthwise inner edges, and are configured to rise up due to the contractile force of these rise-up elastic members. The side sheets are joined to the top sheet at the rise base. The method for joining the side sheets to the top sheet is not particularly limited, and examples include adhesives and fusion bonding.

[0044] (Absorbent articles) Examples of the absorbent article include incontinence pads, sanitary napkins, disposable auxiliary pads that are attached to disposable diapers or sanitary napkins, etc. Examples of the shape of the incontinence pads, sanitary napkins, or disposable auxiliary pads include hourglass and gourd shapes. [Example]

[0045] The present invention will be described in detail using examples, but the present invention is not limited to the following examples, and all modifications and embodiments that do not deviate from the spirit of the present invention are included in the scope of the present invention.

[0046] The absorbent article of the present invention will be described below with reference to Figures 1 to 9, taking a disposable auxiliary pad as an example. In the figures, arrow x is defined as the width direction, and arrow y as the front-to-rear direction. The direction on the plane formed by arrows x and y is defined as the planar direction. The direction perpendicular to the plane formed by arrows x and y represents the up-down direction z.

[0047] (Implementation) Fig. 1 shows a plan view of an absorbent article (disposable auxiliary pad). Fig. 2 shows a back view of the absorbent article of Fig. 1. Fig. 3 shows a schematic cross-sectional view of the absorbent article of Fig. 1 taken along line AA. Fig. 4 shows a schematic cross-sectional view of the absorbent article of Fig. 1 taken along line BB.

[0048] The auxiliary pad 1 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 disposed therebetween. The auxiliary pad 1 has side sheets 5 joined to both side edges of the top sheet 2 in the width direction x, extending in the front-to-rear direction y of the auxiliary pad 1. The side sheets 5 are made of a liquid-impermeable plastic film, a water-repellent nonwoven fabric, or the like. The side sheets 5 are joined to the top sheet 2 at rising bases 51, with the free ends inward from the rising bases 51 being free to rise. Elastic flap members 6 are provided at the free ends of the side sheets 5, and rising flaps are formed by the contractile force of the elastic flap members. A fixing member 7 is provided on the outer surface of the back sheet 3. The area overlapping the fixing member 7 in the thickness direction is the fixing member area 71.

[0049] The back sheet 3 has an outer sheet 31 and an inner sheet 32 ​​arranged on the top sheet side of the outer sheet. The outer sheet 31 and the inner sheet 32 ​​are bonded together with an adhesive 33. The area ratio of the bonded region between the outer sheet 31 and the inner sheet 32 ​​is 40%.

[0050] The interlayer space has a gap region N (hatched region in FIG. 1) where the outer sheet 31 and the inner sheet 32 ​​are not joined. The gap region N is provided over the entire fixing member region 71, and extends outward over the entire periphery of the fixing member region 71.

[0051] The total area of ​​the gap area N, including the portion provided in the fixing member area 71 and the portion extending outward from the fixing member area 71, is four times the area of ​​the fixing member 7. The lengths of the extending gap areas at both front-to-rear direction edges of the fixing member area 71 are 50% outward from the front end and 50% outward from the rear end, when the length of the fixing member in the front-to-rear direction is 100%. The lengths of the extending gap areas at both widthwise direction edges of the fixing member area 71 are 50% outward from the right end and 50% outward from the left end, when the length of the fixing member in the width direction is 100%.

[0052] The action of the absorbent article when worn will be described with reference to Figures 5 and 6. Figures 5 and 6 are schematic cross-sectional views showing the absorbent article when worn. When the absorbent article 1 is used, it is fixed to the underwear 8 using the fixing member 7. If the underwear 8 moves (in Figure 6, the underwear 8 moves to the right relative to the absorbent article 1), the fixing member 7 moves along with the underwear 8. However, because a slippage area N is provided in the fixing member area 71, the outer sheet 31 in this slippage area N can deform freely. Specifically, in Figure 6, the outer sheet 31 contracts in the area to the right of the fixing member 7, and the outer sheet 31 stretches in the area to the left of the fixing member 7. Therefore, the movement of the underwear 8 is absorbed by the deformation of the outer sheet 31, which inhibits the movement of the inner sheet 32, and also inhibits the movement of the top sheet 2 and the absorbent body 4. Therefore, even if the underwear 8 moves, the movement of the top sheet 2 is inhibited, thereby inhibiting chafing caused by the absorbent article 1.

[0053] In Figures 1 and 2, the auxiliary pad 1 and the absorbent body 4 are shown as having a rectangular shape in plan view, but they may also be hourglass- or gourd-shaped. In Figures 1 and 2, the fixing member 7 is shown as having a rectangular shape in plan view, but it may also be circular, elliptical, or polygonal. In Figures 1 and 2, there is one fixing member 7, but two or more may be provided. In Figures 1 and 2, the outer sheet 31 and the inner sheet 32 ​​are each shown as a single layer, but they may each be multi-layered. In Figures 1 and 2, adhesive 33 is provided on the outer sheet 31 and the inner sheet 32 ​​in all areas other than the slippage area N, but this adhesive 33 may also be provided intermittently.

[0054] (Other embodiments) Another embodiment will be described with reference to Figures 7 to 9. Figures 7 to 9 are back views showing another embodiment of the absorbent article. In the other embodiment, the members other than the fixing member 7 and the offset region N are the same as those in Figures 1 to 4, so the drawings and description thereof will be omitted.

[0055] 7, one rectangular fixing member 7 is disposed. A gap region N is provided over the entire fixing member region 71, and the gap region N extends outward over the entire periphery of the fixing member region 71. The gap region N also extends over the entire width of the backsheet 3.

[0056] In the embodiment shown in Fig. 7, the total area of ​​the offset region N, including the portion provided in the fixing member region 71 and the portion extending outward from the fixing member region 71, is 16 times the area of ​​the fixing member 7. The lengths of the extending offset regions at both front-to-rear direction edges of the fixing member region 71 are 100% outward from the front end and 100% outward from the rear end, when the length of the fixing member in the front-to-rear direction is 100%. The lengths of the extending offset regions at both widthwise direction edges of the fixing member region 71 are 215% outward from the right end and 215% outward from the left end, when the length of the fixing member in the width direction is 100%.

[0057] In the embodiment of Fig. 8, one belt-shaped fixing member 7 is disposed. This fixing member 7 is disposed continuously over the entire front-rear direction of the back sheet 3. A gap area N is provided over the entire fixing member area 71, and the gap area N extends outward on both sides of the fixing member area 71 in the width direction.

[0058] 8, the total area of ​​the offset region N, including the portion provided in the fixing member region 71 and the portion extending outward from the fixing member region 71, is twice the area of ​​the fixing member 7. At both widthwise edges of the fixing member region 71, the length of the extending offset region is 50% outward from the right end and 50% outward from the left end, assuming that the length of the fixing member in the width direction is 100%.

[0059] 9, one rectangular fixing member 7 is disposed. The fixing member region 71 is divided into two equal parts in the front-to-rear direction, with the outer side in the front-to-rear direction being the joining region and the inner side (center side) in the front-to-rear direction being the offset region N. Therefore, 50% of the area of ​​the fixing member region 71 is provided with the offset region N, and 50% of the area of ​​the fixing member region 71 is the joining region.

[0060] Further, the offset region N in the fixing member region 71 extends outward from the fixing member region 71. Specifically, the offset region N extends outward from the inner edge of the front-to-rear end edges of the fixing member region 71. Furthermore, at both widthwise end edges of the fixing member region 71, the offset region N extends outward over 50% of the total length on the inner side in the front-to-rear direction.

[0061] In the embodiment of Fig. 9, the total area of ​​the gap area N, including the portion provided in the fixing member area 71 and the portion extending outward from the fixing member area 71, is four times the area of ​​the fixing member 7. In the front-to-rear direction of the fixing member area 71, the length of the extending gap area is 150% outward from the rear end, when the length of the fixing member in the front-to-rear direction is 100%. At both widthwise edges of the fixing member area 71, the lengths of the extending gap areas are 50% outward from the right end and 50% outward from the left end, when the length of the fixing member in the width direction is 100%. [Explanation of symbols]

[0062] 1: absorbent article (auxiliary pad), 2: top sheet, 3: back sheet, 31: outer sheet, 32: inner sheet, 33: adhesive, 4: absorbent body, 5: side sheet, 6: elastic member for flap, 7: fixing member, 71: fixing member region, 8: underwear, N: slippage allowance region

Claims

1. The device has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, The back sheet has an outer sheet and an inner sheet disposed on the top sheet side of the outer sheet, the outer sheet is a nonwoven fabric having an elongation rate of 5% to 130%, A fixing member is provided on the outer surface side of the back sheet, Between the outer sheet and the inner sheet, the area ratio of the bonded region where the outer sheet and the inner sheet are bonded is 40% or more, An absorbent article characterized in that a gap area where the outer sheet and the inner sheet are not joined is provided between the layers in at least a portion of the area that overlaps with the fixing member in the thickness direction.

2. The absorbent article according to claim 1 , wherein the gap area is provided between the layers over 50% or more of an area that overlaps with the fixing member in the thickness direction.

3. 3. The absorbent article according to claim 1, wherein the offset region extends between the layers outward from a region overlapping the fixing member in the thickness direction.

4. The absorbent article according to any one of claims 1 to 3, wherein the offset region is provided between the layers over the entire region that overlaps with the fixing member in the thickness direction.

5. 5. The absorbent article according to claim 4, wherein the offset region extends outwardly over the entire periphery of the region that overlaps the fixing member in the thickness direction between the layers.

6. The length of the gap area extending outward in the front-to-back direction of the area overlapping with the fixing member in the thickness direction is 10% or more and 100% or less when the length of the fixing member in the front-to-back direction is 100%, 6. The absorbent article according to claim 5, wherein the length of the gap region extending outward in the width direction of the region overlapping with the fixing member in the thickness direction is 10% or more and 100% or less when the length of the fixing member in the width direction is 100%.

7. The absorbent article according to any one of claims 1 to 6, wherein an area ratio of the bonded region in the region other than the slippage region between the layers is 70% or more.

8. The absorbent article according to any one of claims 1 to 7, wherein the basis weight of the outer sheet is lower than the basis weight of the inner sheet.

9. The absorbent article according to any one of claims 1 to 8, wherein the total area of ​​the portion of the slippage area provided in the area overlapping with the fixing member in the thickness direction and the portion extending outward from the area overlapping with the fixing member in the thickness direction is 2 to 16 times the area of ​​the fixing member.

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