CN107106350B

CN107106350B - Absorbent article

Info

Publication number: CN107106350B
Application number: CN201580070873.2A
Authority: CN
Inventors: 西谷和也; 木下英之
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2014-12-24
Filing date: 2015-07-17
Publication date: 2020-08-18
Anticipated expiration: 2035-07-17
Also published as: JP2016119988A; WO2016103773A1; KR102508046B1; TW201634019A; KR20170099972A; TWI702943B; JP6456137B2; CN107106350A

Abstract

Provided is an absorbent article which can fit an absorbent core to the buttocks of a wearer and can suppress leakage. An absorbent article (1) is provided with: an excretory opening contact region (S1) opposite to the excretory opening of the wearer; a rear region (S2) located rearward of the drain contact region (S1); and an absorbent core (31) disposed in the excretory opening contact region (S1) and the rear region (S2). The absorbent core (31) in the rear side region (S2) is provided with: a front-back slit (42) which is disposed in the center of the absorbent core (31) in the width direction (W) and extends in the front-back direction (L) of the absorbent article (1); and an auxiliary slit (43) that is continuous with the front and rear slits (42) and extends outward in the width direction (W) from the front and rear slits (42). The outer edge (43E) of the auxiliary slit (43) is positioned further inward in the width direction (W) than the outer edge (31E) of the absorbent core (31) in the rear region (S2).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a sanitary napkin.

Background

Patent document 1 discloses an absorbent article including: a middle-high part which is raised toward the skin contact surface side; and leakage-preventing grooves which are provided on both outer sides in the width direction of the middle-high portion and are formed by compressing the surface sheet and the absorber. The excretory opening contact region of the absorbent article is sandwiched by the legs of the wearer in the worn state, and exerts a force directed inward in the width direction. When a force directed inward in the width direction is applied to the absorbent article of patent document 1, the leakage preventing grooves are bent toward the wearer's crotch skin, and the mid-height portion of the absorbent body is raised accordingly (see paragraph 0016 of patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2012 and 239722

Disclosure of Invention

However, the absorbent article described above has the following problems.

The cross-sectional shape of the body of the wearer in the width direction near the buttocks is a shape in which the right and left buttocks bulge and the buttocks sag. Since the mid-high portion in patent document 1 extends rearward from the excretory opening contact region, if the absorbent body in the excretory opening contact region swells, the absorbent body in the rear region also swells. Since the middle-high portion of the rear region of patent document 1 is configured to have a large grammage, the thickness of the ridge becomes large when the ridge rises to the wearer side, and it is difficult to arrange the ridge along the concavity of the buttocks of the body. As a result, a gap may be formed between the buttocks of the wearer and the absorbent article, and leakage may occur.

The cross-sectional shape of the wearer's body in the front-rear direction is rounded from the excretory opening contact region to the rear. If the absorbent core in the rear region is not arranged along the roundness of the body, back leakage may occur.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an absorbent article in which an absorbent core can be attached to the buttocks of a wearer to suppress leakage.

In order to solve the above problem, an absorbent article (absorbent article 1) of the present disclosure includes: an excretory opening contact region (excretory opening contact region S1) which is opposite to the excretory opening of the wearer; a rear region (rear region S2) located on the rear side of the drain opening contact region; an absorbent core (absorbent core 31) disposed in the excretory opening contact region and the back region, wherein the absorbent core in the back region is provided with: a front-back slit (front-back slit 42) disposed at the center in the width direction of the absorbent core and extending in the front-back direction of the absorbent article; and an auxiliary slit (auxiliary slit 43) that is continuous with the front and rear slits and extends from the front and rear slits outward in the width direction, wherein an outer edge (outer edge 43E) of the auxiliary slit is positioned further inward in the width direction than an outer edge (outer edge 31E) of the absorbent core in the rear region.

In addition, the absorbent article (absorbent article 1) of the present disclosure includes: an excretory opening contact region (excretory opening contact region S1) which is opposite to the excretory opening of the wearer; a rear region (rear region S2) located on the rear side of the drain opening contact region; an absorbent core (absorbent core 31) disposed in the excretory opening contact region and the back region, wherein the absorbent core in the back region is provided with: a 1 st curved portion (front-rear slit 42) configured such that the center in the width direction of the absorbent core in the rear region can be curved in a convex shape toward the wearer; and a 2 nd curved portion (auxiliary slit 43) which constitutes a deformation base point of the absorbent core in the rear region, the deformation base point being curved in the thickness direction and extending in the width direction, wherein an outer edge (outer edge 43E) of the 2 nd curved portion is positioned further inward in the width direction than an outer edge (outer edge 31E) of the absorbent core.

Drawings

Fig. 1 is a plan view of an absorbent article of an embodiment.

Fig. 2 is a rear view of the absorbent article shown in fig. 1.

Fig. 3 is a schematic sectional view of the section a-a shown in fig. 1.

Fig. 4 (a) and 4 (b) are cross-sectional views of the absorbent article 1 shown in fig. 1 in a state of being worn on a wearer.

Fig. 5 is a sectional view of the absorbent article 1 shown in fig. 1 in a state of being worn on a wearer.

Detailed Description

(1) Unitary structure of absorbent article

The overall structure of the absorbent article 1 of the embodiment will be described with reference to fig. 1 to 3. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and it should be noted that the ratio of the respective dimensions and the like are different from the actual ratio. Therefore, specific dimensions and the like should be determined with reference to the following description. The drawings may include portions having different dimensional relationships and ratios from each other.

Fig. 1 is a plan view of an absorbent article, and fig. 2 is a rear view of the absorbent article. Fig. 3 is a sectional view a-a shown in fig. 1. The absorbent article 1 of the present embodiment is a sanitary napkin for night use.

The absorbent article 1 has a front-back direction L extending toward the front (abdomen) and back (back) of the wearer, a width direction W perpendicular to the front-back direction L, and a thickness direction T extending in the skin-facing surface side T1 and the non-skin-facing surface side T2 of the wearer.

The absorbent article has an excretory opening contact region S1 disposed in the excretory opening contact region of the wearer, a rear region S2 located on the rear side of the excretory opening contact region S1, and a front region S3 located on the front side of the excretory opening contact region S1. The length in the front-rear direction L of the rear region S2 is longer than the length in the front-rear direction L of the excretory opening contact region S1. The excretory opening contact region S1 is a region worn in the lower crotch portion of the undergarment in the state in which the undergarment is worn. At the excretory opening contact region S1, wings discussed later are provided. The boundary between the excretory opening contact region S1 and the rear region S2 is a width slit 41 discussed later. The front end edge of the width slit 41 is the rear end edge of the excretory opening contact region S1, and the rear end edge of the width slit 41 is the front end edge of the rear region S2. The rear end edge of the rear region S2 is the rear end edge of the absorbent article 1. The boundary between the excretory opening contact region S1 and the front region S3 is the front end edge of the flap 3. The leading end edges of the flaps 3 are the base portions of the flaps 3, and are portions located on the front side, out of the portions of the flaps 3 that are recessed to the inside in the width direction to the maximum extent. The base of the front side of the flap 3 is the front end edge of the excretory opening contact region S1 and the rear end edge of the front side region S3. The front end edge of the front side region S3 is the front end edge of the absorbent article 1. In fig. 3, the front-rear direction ranges of the excretory opening contact region S1, the rear region S2, and the front region S3 are shown.

The absorbent article 1 includes an absorber 30, a skin sheet 10 positioned closer to the skin-facing surface side T1 than the absorber 30, and a non-skin sheet 20 positioned closer to the non-skin-facing surface side T2 than the absorber 30. The skin sheet 10 has: a liquid-permeable top sheet 11 that covers at least the widthwise center of the absorber 30; and a side sheet 12 that covers an outer edge (outer end in the width direction) of the front sheet 11 and extends outward in the width direction. The non-skin surface sheet 20 is a liquid-impermeable sheet.

The top sheet 11 is a liquid-permeable sheet permeable to liquid such as body fluid. The top sheet 11 covers at least the surface of the absorbent body 30. The top sheet 11 is not particularly limited as long as it is a sheet-like material having a liquid-permeable structure such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, or a mesh sheet. As a material of the woven fabric or the nonwoven fabric, any of natural fibers and chemical fibers can be used.

The side sheet 12 can be selected from the same material as that of the surface sheet 11. However, in order to prevent menstrual blood from flowing beyond the side sheet 12 and toward the outside of the absorbent article 1, the side sheet 12 is preferably hydrophobic or hydrophobic. The side sheet 12 is disposed at the outer edge of the absorbent body 30, the flaps 3, and the hip flaps 4.

The non-skin sheet 20 has a length substantially equal to the length of the skin sheet 10. The non-skin-facing sheet 20 may be a polyethylene sheet, a laminated nonwoven fabric mainly composed of polypropylene or the like, an air-permeable resin film, a sheet obtained by joining an air-permeable resin film to a nonwoven fabric such as a spun-bonded nonwoven fabric or a spun-laced nonwoven fabric, or the like.

The absorbent body 30 includes an absorbent core 31 formed by laminating absorbent materials and a core wrap 32 covering the absorbent core 31. Examples of the absorbent material include hydrophilic fibers, pulp, and SAP. In the absorbent body 30 of the present embodiment, the rear end edge of the absorbent core 31 is substantially aligned with the rear end edge of the core wrap 32.

The absorbent core 31 is disposed in the excretory opening contact region S1 and the back region S2. The absorbent core 31 may be disposed in the state of being divided in the excretory opening contact region S1 and the rear region S2, or may be disposed so as to straddle the excretory opening contact region S1 and the rear region S2. The absorbent core 31 may be disposed in at least the excretory opening contact region S1 and the rear region S2, or may be disposed in the excretory opening contact region S1, the rear region S2, and the front region S3.

The absorbent core 31 has a middle-high portion 33 located inward in the width direction of the outer edge 31E of the absorbent core 31. The middle height portion 33 is located in the excretory opening contact region S1 and is located further inward in the width direction than the outer edge 31E of the absorbent core 31 in the excretory opening contact region S1. The thickness of the middle high portion 33 is thicker than the thickness of the outer side edge 31E of the absorbent core 31 at the excretory opening contact region S1. The grammage of the absorbent material of the mid-height portion 33 is higher than the grammage of the absorbent material of the outer side edge 31E of the absorbent core 31 at the excretory opening contact region S1. The mid-height portion 33 is located on the rear side in the drain opening contact area S1, adjacent to the width slit 41. The outer edge of the middle-high portion 33 in the present embodiment is provided with a compressed portion 80 in which the absorber 30 and the skin sheet 10 are compressed in the thickness direction.

The absorbent core 31 has a width slit 41, front and rear slits 42, and an auxiliary slit 43. The width slits 41, the front and rear slits 42, and the auxiliary slits 43 of the absorbent core 31 are configured such that the absorbent core 31 can be bent in the thickness direction T.

The grammage of the absorbent material of the width slits 41, the front and rear slits 42, and the auxiliary slits 43 is lower than the grammage of the absorbent material of the surrounding absorbent core 31. The surrounding absorbent core 31 is an absorbent core in a region adjacent to the width slit or the like, for example, an absorbent core adjacent to the width slit 41 in the excretory opening contact region S1 and an absorbent core adjacent to the width slit 41 in the rear side region S2. The width slit 41, the front and rear slits 42, and the auxiliary slit 43 may be regions in which the grammage of the absorbent is lower than that of the surrounding absorbent core 31, and may be regions in which the grammage is 0 or regions in which the absorbent is arranged while the grammage is 0 in design and mixed from the surrounding absorbent core 31.

The grammage in design of the width slit 41, the front and rear slits 42, and the auxiliary slit 43 in the present embodiment is 0. Therefore, no absorbent material is disposed between the skin-facing sheet 10 and the non-skin-facing sheet 20 in the region overlapping with the width slit 41, the region overlapping with the front-back slit 42, and the region overlapping with the auxiliary slit 43 in the thickness direction T. In addition, the skin-facing sheet 10 and the non-skin-facing sheet 20 are not joined in the region overlapping with the width slit 41, the region overlapping with the front-rear slit 42, and the region overlapping with the auxiliary slit 43 in the thickness direction T.

In the region overlapping with the width slit 41, the region overlapping with the front and rear slits 42, and the region overlapping with the auxiliary slits 43, the core wrap layer 32 positioned on the skin-facing surface side of the absorbent core 31 and the core wrap layer 32 positioned on the non-skin surface side of the absorbent core 31 may be joined or not joined. For example, with a structure in which the core wrap layer 32 positioned on the skin-facing surface side of the absorbent core 31 and the core wrap layer 32 positioned on the non-skin-facing surface side of the absorbent core 31 are joined, the absorbent core 31 can be prevented from being out of shape. The front sheet 11 and the core wrap 32 may or may not be joined to each other in the region overlapping the width slit 41, the region overlapping the front and rear slits 42, and the region overlapping the auxiliary slit 43. The non-skin-facing sheet 20 and the core wrap 32 may or may not be joined to each other in the region overlapping the width slit 41, the region overlapping the front and rear slits 42, and the region overlapping the auxiliary slit 43.

The width slit 41, the front-rear slit 42, and the auxiliary slit 43 serve as boundaries of rigidity change. Specifically, for example, the region on the front side of the width slit 41 has a different rigidity from the region on the rear side of the width slit 41. More specifically, the absorbent material in the region on the front side of the width slit 41 has a higher grammage than the absorbent material in the width slit 41. The absorbent material in the region behind the width slits 41 has a higher grammage than the absorbent material in the width slits 41.

The width slit 41 extends in the width direction W between the excretory opening contact region S1 and the rear region S2. The width slit 41 may extend at least in the width direction, and may be linear or curved, not parallel to the width direction but inclined with respect to the width direction. The width slit of the present embodiment has a curved shape in which the center of the width slit 41 in the width direction protrudes rearward. More specifically, the center of the width slit 41 in the width direction is located rearward of the outer edge of the width slit 41. The center of the width slit 41 in the width direction is convex toward the rear. Further, the length of the width slit in the front-rear direction may be constant or may vary. The length of the width slit in the front-rear direction is 10mm to 50mm, and more preferably 10mm to 30 mm.

For example, when the length of the width slit 41 in the front-rear direction is less than 10mm, there is a case where a function of buffering or dividing the movement of the front side of the width slit 41 and the movement of the rear side of the width slit 41 cannot be sufficiently obtained. Further, when the length of the width slit 41 in the front-rear direction exceeds 50mm, the effect of cushioning or dividing the movement of the front side of the width slit 41 and the movement of the rear side of the width slit 41 becomes large, but the feeling of comfort as an absorbent article may be reduced.

Further, the length of the width slit 41 in the width direction is preferably 25mm or more. In general, the length of the middle-high portion 33 in the width direction (the length of the portion with a relatively high grammage) of the sanitary napkin for night use is usually 25mm to 30mm in many cases. For example, if the intermediate height portion 33 is continuously formed in the excretory opening contact region S1 and the rear region S2, the movement of the excretory opening contact region S1 may be interlocked with the rear region S2 due to the intermediate height portion. However, the length of the width slit 41 in the width direction is 25mm or more, and the movement of the excretory opening contact region S1 in which the middle height portion 33 is divided in the front-rear direction and the rear region S2 are interlocked can be suppressed.

The width slit 41 may be formed in the entire region in the width direction of the absorbent core 31 or may be formed in a partial region in the width direction of the absorbent core. The width slit 41 of the present embodiment is formed over the entire width of the absorbent core 31. The outer edges 41E of the width slits 41 are located at the outer edges 31E of the absorbent core 31. Thus, the absorbent core 31 of the excretory opening contact region S1 and the absorbent core 31 of the back region S2 are divided by the width slit 41 in the front-back direction. Further, with the absorbent body 30 of the present embodiment, the outer edge of the absorbent core 31 is substantially aligned with the outer edge of the absorbent body 30. Thus, on the drawing, the outer side edges 41E of the width slits 41 are shown aligned with the outer side edges of the absorbent body 30.

The front-rear slits 42 extend in the front-rear direction L in the rear side region S2. The front-rear slit 42 may extend at least in the front-rear direction, and may be linear or curved, not parallel to the front-rear direction but inclined with respect to the front-rear direction. The front-rear slits 42 may be formed in the entire region of the rear region S2 in the front-rear direction L of the absorbent core 31, or may be formed in a part of the rear region S2 in the front-rear direction L of the absorbent core 31. The front-rear slits 42 of the present embodiment are formed over the entire region of the absorbent core in the front-rear direction L of the rear region S2. Thus, the absorbent core 31 of the back region S2 is divided in the width direction by the front and back slits 42.

Further, the front end edges of the front and rear slits 42 are preferably located rearward of the positions located at a distance of 30mm from the center 3LC of the flaps 3 in the front-rear direction. Preferably, the rear end edges of the front and rear slits 42 are located rearward of the positions located at a distance of 200mm from the center 3LC of the flaps 3 in the front-rear direction. The length of the front-rear slit 42 in the front-rear direction is preferably 150mm or more. In a cross section along the front-rear direction of the wearer's body, the groove between the buttocks is present in a range from the periphery beyond the perineum to the coccyx. With such front and rear slits 42, a convex deformation with the front and rear slits as apexes is easily arranged in the grooves between the buttocks.

The length of the front-rear slit 42 in the width direction is 1mm to 15 mm. For example, when the length of the front and rear slits 42 in the width direction is less than 1mm, when the front and rear slits 42 are deformed into a convex shape with the apex thereof, the absorbent cores 31 arranged through the width slits interfere with each other, and it is difficult to stably deform into a convex shape. Further, when the length in the width direction of the front and rear slits 42 exceeds 15mm, when the convex deformed portion having the front and rear slits 42 as the apex is disposed in the gap between the buttocks, the absorbent core is not present in the convex deformed portion, and therefore, the absorption of body fluid may become insufficient.

The absorbent core 31 of the back region S2 has a 1 st region 311 and 2 nd and 3

rd regions

312 and 313 respectively located outside the 1 st region 311 in the width direction. Fig. 1 shows the range of the 1 st region 311, the 2 nd region 312, and the 3 rd region 313 in the width direction. The 1 st region 311, the 2 nd region 312, and the 3 rd region 313 are regions that trisect the absorbent core 31 of the back region S2 in the width direction. The 1 st region 311 is a region located at the center in the width direction among the trisected regions. The 2 nd region 312 is a region located at one side portion in the width direction among the trisected regions. The 3 rd region 313 is a region located on the other side in the width direction among the trisected regions. Further, the structure in which the length of the absorbent core in the width direction of the back region S2 varies is set to a region that trisects the absorbent core 31 adjacent to the width slit 41 in the width direction.

The front and rear slits 42 are provided in the 1 st region 311. The front-rear slit 42 may be disposed at the center of the absorbent article 1 in the width direction W. The front and rear slits 42 are configured such that the absorbent core 31 in the rear region S2 can be bent in the thickness direction T, and more specifically, such that the absorbent core 31 in the rear region S2 can be raised toward the wearer. The front and rear slits 42 constitute the 1 st curved portion.

The width slit 41 is connected to the front and rear slits 42. Thus, the absorbent core 31 of the excretory opening contact region S1, the absorbent core 31 on one side in the width direction W of the back region S2 (for example, the absorbent core on the left side of the wearer), and the absorbent core 31 on the other side in the width direction W of the back region S2 (for example, the absorbent core on the right side of the wearer) are divided in a plan view. Further, the width slit 41 and the front-rear slit 42 may be separated.

The auxiliary slit 43 is continuous with the front and rear slits 42 and extends outward in the width direction W from the front and rear slits 42. The auxiliary slit 43 may extend at least in the width direction, and may be linear or curved, not parallel to the width direction, but inclined with respect to the width direction. The auxiliary slits 43 extend to both sides in the width direction of the front and rear slits 42. The auxiliary slits 43 are provided in plurality at intervals in the front-rear direction L. The outer side edge 43E of the auxiliary slit 43 is located inward in the width direction W from the outer side edge 31E of the absorbent core 31 in the back region S2. That is, the absorbent is disposed outside the auxiliary slit 43 in the width direction. Further, the auxiliary slit 43 may also extend to the outer side edge 31E of the absorbent core 31 of the back region S2. The auxiliary slit 43 extends forward from the inner side in the width direction W (the front-rear slit 42 side) toward the outer side in the width direction W.

The auxiliary slits 43 are configured as deformation base points at which the absorbent core 31 constituting the rear region S2 is bent in the thickness direction. The auxiliary slit 43 constitutes the 2 nd curve portion. Further, the 1 st curved portion and the 2 nd curved portion may be constituted not only by the front and rear slits but also by other structures. For example, the 1 st curved portion and the 2 nd curved portion may be formed of a compressed portion that compresses at least the absorbent core in the thickness direction, may be formed of a region having a different rigidity due to a difference in grammage of the absorbent core from the surrounding grammage, or may be formed of embossing by bite molding of concave portions and convex portions.

The absorbent article is provided with a compressed portion 80 in which at least the absorbent core is compressed in the thickness direction. The compression unit 80 includes a front compression unit 81, a rear compression unit 82, and a hip flap compression unit 83. The front compression section 81 is disposed in the excretory opening contact region S1 and the front region S3, and is formed by compressing the absorbent body 30 and the top sheet 11 in the thickness direction. The front compression unit 81 extends in the front-rear direction at positions on both outer sides in the width direction with respect to the center in the width direction of the drain contact area S1. The front end edge of the front compression section 81 is tapered toward the front.

The rear compression section 82 is disposed in the 2 nd region 312 and the 3 rd region 313 of the rear region S2, respectively, and is formed by compressing the absorbent body 30 and the top sheet 11 in the thickness direction. The rear compression section 82 is provided in the region where the absorbent core is disposed. The rear compression section 82 extends in the front-rear direction L at positions on both outer sides in the width direction with respect to the auxiliary slit 43. The rear compression section 82 may extend at least in the front-rear direction, and may be linear parallel to the front-rear direction or curved not parallel to the front-rear direction but inclined with respect to the front-rear direction. The rear compression section 82 is located on the outer side in the width direction of the auxiliary slit 43 and on the inner side in the width direction of the outer edge of the absorbent core. The rear side compression portion 82 does not overlap the auxiliary slit 43 in the thickness direction. Further, the front-side compression unit 81 and the rear-side compression unit 82 may compress at least the absorbent core. The rear compression section 82 is formed by compressing the absorbent core 31 and the skin-facing sheet (top sheet 11) from the skin-facing surface side T1 toward the non-skin-facing surface side T2.

The hip flap compressed portion 83 is disposed in the rear region S2, and is formed by compressing the side sheet 12 and the non-skin surface sheet 20 in the thickness direction. The hip flap compressing part 83 is provided to the hip flap. The hip-flap compressing portion 83 extends in the front-rear direction. The hip flap compressing portion 83 is convex projecting outward in the width direction W.

The absorbent article 1 has wings 3 and hip flaps 4. The flaps 3 and the hip flaps 4 extend outward in the width direction with respect to the outer side edge 31E of the absorbent core 31 of the excretory opening contact region S1.

The flaps 3 have side panels 12 and a non-skin facing sheet 20. The center 3LC of the flap 3 in the front-rear direction is disposed so as to face the excretory opening of the wearer. The flaps 3 are configured to be folded back toward the non-skin-facing surface of the crotch portion of the undergarment when in use, and to be folded back toward the non-skin-facing surface of the crotch portion of the undergarment. The hip flap 4 is located on the rear side of the flap 3 and is provided in the rear region S2. The hip flap 4 is configured to be disposed on the skin-facing surface side of the undergarment without being folded back toward the non-skin-facing surface side of the undergarment during use. Further, the absorbent material may be disposed on the flaps 3 and the hip flaps 4.

As shown in fig. 2, an adhesive region 60 coated with an adhesive for fixing the absorbent article to the undergarment S is provided on the non-skin-facing surface of the non-skin-facing sheet 20. The adhesive region 60 has: a 1 st and 2 nd main body

adhesive regions

61 and 62 arranged on the non-skin-facing surface side of the absorbent core 31; wing adhesive regions 63 disposed on the wings 3; and a hip panel adhesive area 64 disposed on the hip panel 4.

The 1 st main body bonding region 61 is separated from the 2 nd main body bonding region 62 in the front-rear direction, and is disposed forward of the 2 nd main body bonding region 62. The 1 st body bonding region 61 is disposed on the front side of the width slit 41 across the drain opening contact region S1 and the front region S3. The 2 nd main body bonding region 62 is disposed in the rear region S2 at a position rearward of the width slit 41.

The width slit 41 and the front-rear slit 42 do not overlap the bonding region 60 in the thickness direction T. In other words, the adhesive region 60 is not provided in the region where the width slit 41 and the front and rear slits are arranged in a plan view. In addition, adhesive areas 60 are provided on the wings 3 and the hip flaps 4.

The adhesive region 60 is covered with a release sheet 65 in a state before use. The release sheet 65 prevents the adhesive from deteriorating before use. The release sheet 65 is peeled off by the wearer at the time of use. In the absorbent article having no release sheet, the adhesive may be prevented from deteriorating before use by a packaging sheet that individually packages the absorbent article.

The "thickness of the absorbent body" in the present specification is measured by the following measurement method.

When the absorbent article 1 is enclosed in a packaging bag or the like, the following samples are used: the absorbent article 1 was taken out from the packaging bag and left in this state for 12 hours under an atmosphere of 20 ℃. + -. 2 ℃ and a relative humidity of 60%. + -. 5% RH.

The measurement position was the center portion in the width direction of the absorbent body, the measurement was performed not in a state where the absorbent article was contracted but in a state where the stretchable member of the absorbent article was stretched in the measurement, and in addition, the skin sheet other than the absorbent body and the non-skin sheet other than the absorbent body were removed, a dial indicator PEACOCK manufactured by Kawasaki corporation was used, a probe having a diameter of 10mm was used as the probe, a sample having a size of 8930 mm × 30mm was prepared, and the thickness of the sample was measured, and the measurement pressure of the sample was measured by a measuring instrument at 3g/cm²The manner of (2) is adjusted. Here, the above measurement was performed for each of 10 samples, and the average value thereof was defined as the length.

In the present specification, "grammage and density of the absorbent body" is measured by the following measurement method.

In an absorbent article packaged in a package, the package is opened, the folded absorbent article is unfolded, and the thickness and area of a portion to be measured for grammage and density are measured. Next, a portion to be measured for grammage and density is cut out of the absorbent article, and the weight of the cut portion is measured. Next, portions other than the absorbent body, such as the front sheet and the back sheet, were removed from the cut portions, and the weight of the absorbent body was measured. The grammage is calculated based on the weight of the absorbent body and the area of the portion where the grammage and the density are to be measured. The density was calculated based on the grammage and thickness.

The "length" in the present specification is measured by the following measurement method.

Next, the length of the measurement target site in this state was measured along the measurement target site using a tape (tape portion: glass fiber as a base material and polyvinyl chloride as a cover layer) manufactured by japan affinity measurement corporation. Here, the above measurement was performed for each of 10 samples, and the average value thereof was defined as the length.

(2) Action and Effect

The front and rear slits 42 provided at the center in the width direction of the rear region S2 in the absorbent article 1 of the present embodiment bulge toward the wearer as the 1 st curved portion. With the front and rear slits 42, the absorbent core 31 can be fitted to the gap between the buttocks of the wearer in the rear region S2 located rearward of the excretory opening contact region S1. In the absorbent article 1 of the present embodiment, the auxiliary slit 43 serving as the 2 nd curved portion forms a deformation base point extending in the width direction. The absorbent core 31 of the back region S2 can be deformed with the auxiliary slits 43 as base points, and is easily arranged along the roundness of the body in the cross section in the front-back direction L of the body.

Fig. 4 is a sectional view of the absorbent article 1 in a state of being worn on a wearer. Fig. 4 (a) is a cross-sectional view of the excretory opening contact region S1 in the width direction, and fig. 4 (b) is a cross-sectional view of the rear region S2 in the width direction. FIG. 4 (a) is based on the section B-B of FIG. 1, and FIG. 4 (B) is based on the section C-C of FIG. 1. In fig. 4, the line indicating the body of the wearer is indicated by a two-dot chain line. When the absorbent article 1 as a sanitary napkin is worn, the absorbent article is fixed to underwear S, and the underwear is pulled up and worn. The absorbent core of a typical sanitary napkin is designed to have a width dimension that is wider than the width dimension of the crotch of the wearer. Therefore, the excretory opening contact region S1 of the absorbent article 1 in the worn state is sandwiched between the legs of the wearer and receives a force directed from the outer side in the width direction toward the inner side in the width direction.

The cross-sectional shape of the wearer's body along the width direction W of the absorbent core 31 differs between near the crotch and near the buttocks. Specifically, the cross-sectional shape of the body in the vicinity of the cleft of the wearer's crotch (around the vaginal opening through which menstrual blood flows) in the width direction is a convex shape in which the labia majora protrudes toward the base of the thighs and the absorbent article side. The excretory opening contact region S1 of the absorbent article is disposed so as to face the wearer' S crotch region. In a state where the absorbent article 1 is worn on the undergarment S and on the wearer, the absorbent core deformed into the excretory opening contact region S1 is pushed down by the projection of the labia majora and raised toward the non-skin-facing surface side. The absorbent core of the excretory opening contact region S1 is disposed along the body at the crotch of the wearer, and leakage at the crotch can be suppressed.

The anal cleft and the gluteal cleft are positioned behind the perineum, and the perineum is positioned behind the labia majora of the wearer. The cross-sectional shape of the body along the width direction in the vicinity of the posterior perineum is a shape in which the center in the width direction is depressed. The rear region S2 of the absorbent article is disposed so as to face the buttocks of the wearer. For example, sanitary napkins for overnight use are often used in a supine position. Most of the leakage occurs when a large amount of menstrual blood is discharged at one time and absorption of menstrual blood directly below the vaginal opening is not in time, or when an absorbent body located directly below the vaginal opening is not in contact with the body, menstrual blood flows into a portion depressed from the buttocks, and the menstrual blood leaks out through the body. If a gap is formed between the buttocks of the body and the absorbent article, menstrual blood may flow along the body and be transmitted to the back side, particularly in a sanitary napkin for night use, and may leak from the back of the absorbent article.

In the rear region S2 of the absorbent article of the present embodiment, the side portions of the absorbent core 31 are pressed down by the left and right buttocks. Thus, a larger force is applied to the side portions in the width direction of the absorbent core in the back region than to the center in the width direction of the absorbent core 31 in the back region. When the side portions of the absorbent core are pressed down by the left and right buttocks, the center in the width direction of the absorbent body in the back region bulges toward the wearer side with the front and back slits as vertexes. Therefore, the center of the absorbent core 31 in the width direction of the rear region S2 is easily placed in the depression between the buttocks, and the absorbent core 31 can be placed further along the buttocks of the wearer. As a result, body fluid such as menstrual blood can be prevented from passing along the body to the rear of the back and leaking from the rear of the absorbent article.

In addition, the front-rear slit 42 penetrating in the thickness direction is formed in the center of the absorbent core 31 in the width direction in the rear side region S2, and an absorbent material is not substantially disposed. Thus, the thickness of the raised portion, particularly the apex, becomes thin. Further, if the absorbent is disposed in the front and rear slits 42, the absorbent core 31 tends to maintain a flat state due to the rigidity of the absorbent, and the absorbent core 31 may be difficult to bend at the front and rear slits 42 as a base point. However, since the absorbent is not substantially disposed in the front and rear slits 42, the absorbent core 31 can be easily maintained in a state of being folded with the front and rear slits 42 as base points. Therefore, the absorbent article 1 can be placed in a more intimate contact with the gap between the buttocks of the wearer, and leakage at the buttocks can be suppressed.

Fig. 5 is a sectional view of the absorbent article 1 in a state of being worn on a wearer. Fig. 5 is a sectional view taken along the front-rear direction L of the body with reference to the section a-a shown in fig. 1. In fig. 5, a line indicating the body of the wearer is indicated by a two-dot chain line. In the absorbent article 1, the auxiliary slit 43 forms a deformation base point extending in the width direction. The absorbent core 31 of the back region S2 can be deformed with the auxiliary slits 43 as base points, and is easily arranged along the roundness of the body in the cross section in the front-back direction L of the body. When the absorbent cores 31 in the rear region S2 are fitted in the front-rear direction of the body, the width of the auxiliary slits 43 is appropriately changed, whereby the distance between the absorbent cores 31 adjacent in the front-rear direction via the auxiliary slits 43 is changed. Thus, the absorbent core 31 is easily arranged along the roundness of the body in the cross section in the front-rear direction of the body.

When the absorbent core 31 in the back region S2 rises with the front and back slits 42 as the vertices, the bending rigidity in the front-back direction L of the rising absorbent core 31 increases. Therefore, the absorbent core 31 may be difficult to be disposed along the body front-back direction L. However, since the auxiliary slits 43 are provided, the rigidity of the absorbent core 31 is reduced by the auxiliary slits 43, and the deformation of the absorbent core 31 along the roundness of the buttocks can be promoted.

Further, when the outer edge 43E of the auxiliary slit 43 reaches the outer edge 31E of the absorbent core 31, the absorbent core 31 extends flat in a region from a portion corresponding to the center of the gap between the buttocks to the outer edge of the absorbent core 31, and the outer edge 31E of the absorbent core 31 may not cover the lateral side of the buttocks in the width direction (the portion outside the apex of the buttocks in the width direction). However, since the outer edges 43E of the auxiliary slits 43 are positioned further inward in the width direction than the outer edges 31E of the absorbent core 31, the absorbent core 31 is not divided in the front-rear direction L. When deforming with the auxiliary slits 43 as the base points, the absorbent core 31 disposed at the outer side in the width direction than the auxiliary slits 43 serves as a fulcrum. Therefore, the absorbent core 31 can be deformed continuously in the front-rear direction L when deformed along the roundness of the body in the front-rear direction L. Therefore, the absorbent core 31 in the back region S2 is likely to be in a cup shape enclosing the side portions of the buttocks, and leakage from the buttocks can be effectively suppressed.

Further, the absorbent core 31 in the back region S2 can be deformed independently to the left and right by the front and back slits 42, and the absorbent core 31 in the back region S2 can be made to follow the movement of the body independently to the left and right. For example, the left and right legs move alternately while the wearer walks. With the movement of the legs, the buttocks are also moved alternately from side to side. For example, if the entire width direction of the absorbent core 31 in the back region S2 is moved integrally, the absorbent core 31 in the back region S2 may be moved laterally as a whole by the alternating movement of the legs, and the feeling of fit at the buttocks may be unstable. However, by dividing the absorbent core 31 in the back region S2 along the left and right by the front and rear slits 42, the absorbent core 31 on one side moves across the front and rear slits 42 due to the alternating motion of the legs. Therefore, the one absorbent core 31 across the front and rear slits 42 can be moved to follow the movement of the body, and the other absorbent core 31 can be continuously attached to the body. Further, by continuously and stably attaching the absorbent core of the rear region S2 to the buttocks, rubbing between the buttocks of the wearer and the absorbent article can be suppressed, and deterioration of the wearing feeling due to rubbing of the skin can be suppressed.

The absorbent core 31 may also be provided with a width slit 41 extending in the width direction W between the excretory opening contact region S1 and the rear region S2. Since the width slit 41 is provided between the excretory opening contact region S1 and the rear region S2, the width slit 41 can suppress the propagation of deformation of the absorbent core 31 to the entire region in the front-rear direction of the absorbent core 31, and the absorbent core 31 in the excretory opening contact region S1 and the absorbent core 31 in the rear region S2 can be deformed in different forms.

As described above, the cross-sectional shape of the wearer's body along the width direction W of the absorbent core 31 differs between the vicinity of the crotch and the vicinity of the buttocks. The absorbent core 31 in the excretory opening contact region S1 is pressed by the projection of the wearer' S labia majora and deformed so as to bulge toward the non-skin-facing surface side. The deformation of the absorbent core 31 in the excretory opening contact region S1 propagates rearward to the region up to the width slit 41. However, the deformation of the absorbent core in the excretory opening contact region S1 is divided by the width slit 41 and is less likely to propagate to the absorbent core 31 in the rear region S2. The absorbent core 31 in the back region S2 bulges toward the wearer and is disposed in the gap between the right and left buttocks. Therefore, the absorbent core 31 of the back region S2 is disposed along the body at the buttocks of the wearer, and leakage at the buttocks can be suppressed.

The auxiliary slits 43 may be provided in plural at intervals along the front-rear direction L. The cross-sectional shape of the body of the wearer in the front-rear direction is rounded. By forming the plurality of auxiliary slits 43 in the absorbent core 31 of the back side region S2, the absorbent core 31 of the back side region S2 is easily deformed with the plurality of auxiliary slits 43 divided in the front-back direction L as base points. Thus, the absorbent core 31 of the back region S2 is arranged along the roundness of the body and in close contact with the gap between the buttocks.

As shown in fig. 3, the absorbent core 31 of the present embodiment is provided with a 1 st auxiliary slit 431, a 2 nd auxiliary slit 432, a 3 rd auxiliary slit 433, and a 4 th auxiliary slit 434 from the front side. The 2 nd auxiliary slit 432 is pressed by the buttocks when lying on the back and easily maintains a flat state. The 2 nd auxiliary slit 432 divides the force pressed by the buttocks, and the 1 st auxiliary slit 431 on the front side of the 2 nd auxiliary slit 432 can be arranged along the bulge between the buttocks and the root portion on the leg side. The 3 rd auxiliary slit 433 is disposed at a position corresponding to the hip portion of a curve shape greatly inflected when viewed from the side of the body in a state other than the lying position (for example, the standing position). The absorbent core 31 can be easily deformed with the 3 rd auxiliary slit 433 as a base point, and the absorbent core 31 can be arranged along a portion corresponding to the buttocks where the curved shape is greatly inflected.

The 1 st auxiliary slit 431 and the 4 th auxiliary slit 434 are disposed at positions corresponding to folds when the absorbent article is folded with the folds along the width direction as base points. Since the auxiliary slits 43 are arranged at positions corresponding to the fold lines, the rigidity is low due to the auxiliary slits 43, and the absorbent article can be stably folded. Further, when the absorbent article is unfolded (used), it is difficult to provide a mark of bending due to a fold, and therefore, the absorbent article is easily deformed in a desired state. Specifically, the absorbent article can be easily arranged in a manner to fit in the gap between the buttocks. In addition, for example, in a configuration in which no slits such as auxiliary slits are provided in the folds of the absorbent article, the absorbent core in the rear region has a relatively strong fold mark extending in the width direction. Therefore, the absorbent article is difficult to fit flexibly from the abdomen side to the back side of the body, and leakage is likely to occur due to the gap between the body and the absorbent article. On the other hand, since the auxiliary slit 43 is provided in the fold line of the absorbent article, the fold mark is less likely to remain, and the absorbent article can be fitted to the body at the position of the auxiliary slit 43.

The auxiliary slit 43 may extend to the front side as going from the front and rear slits 42 to the outer side in the width direction. In the absorbent core 31 in the back region S2, the portion on the back side of the front side is pressed by the buttocks, and therefore, a force is applied from the back side toward the front side. Since the auxiliary slit 43 extends forward from the front and rear slits 42 toward the outer side in the width direction, the force from the rear toward the front is released to the outer side in the width direction by the auxiliary slit 43 and is released to the front. The auxiliary slit 43 releases the force from the rear toward the front and is easily deformed according to the force, and the absorbent core 31 can be further arranged along the hip.

No absorbent material may be disposed between the skin sheet 10 and the non-skin sheet 20 in the region overlapping the front and rear slits 42 in the thickness direction. Since the absorbent is not disposed in the region overlapping the front and rear slits 42, the thickness of the apex raised by the front and rear slits 42 is reduced. Therefore, the absorbent article can be arranged to fit the gap between the buttocks of the wearer more, and leakage at the buttocks can be suppressed.

The front and rear slits 42 may not overlap the adhesive region 60 in the thickness direction T. By not overlapping the front and rear slits 42 with the bonded regions in the thickness direction, deformation of the front and rear slits 42 is suppressed from being excessively hindered by the undergarment, and the absorbent core 31 is easily deformed with the front and rear slits 42 as the base points.

The hip flaps 4 extending outward in the width direction with respect to the outer edge 31E of the absorbent core 31 in the excretory opening contact region S1 may be provided in the rear region S2. By providing the hip flaps 4 in the rear side region S2, not only the side portions (region 2 and region 3) of the absorbent core 31 but also the hip flaps 4 are pressed down when worn. Thus, the absorbent core 31 is apt to further bulge with the front and rear slits 42 as vertexes. Thus, the effect of disposing the absorbent core 31 along the buttocks of the wearer, suppressing leakage at the buttocks, is more easily obtained.

The hip flap 4 may be provided with a convex hip flap compression portion 83 that protrudes outward in the width direction W. By providing the hip flap compressing portion 83, the hip flaps 4 are easily deformed along the roundness of the hips, and the hip flaps 4 can be arranged so as to cover the roundness of the hips. Thus, leakage at the buttocks can be further suppressed.

The excretory opening contact region S1 may have a middle-high portion 33 located further inward in the width direction than the outer edge 31E of the absorbent core 31. By providing the mid-height portion 33 in the excretory opening contact region S1, the absorbent core can be easily brought into close contact with the wearer at the center in the width direction of the excretory opening contact region S1 (at a position inward in the width direction of the outer edge 31E of the absorbent core 31). Therefore, as shown in the cross-sectional view of fig. 4 (a), the adhesiveness of the drain contact region S1 can be improved. As a result, the fit of the absorbent article in the rear region S2 and the fit of the absorbent article in the excretory opening contact region S1 can be achieved.

(3) Other embodiments

The absorbent article of the present embodiment is a sanitary napkin for overnight use worn on underwear, but may be an absorbent pad such as a diaper worn on a diaper as another embodiment.

In addition, although the grammage in design of the width slit 41, the front and rear slits 42, and the auxiliary slits 43 is 0 in the present embodiment, the width slit 41, the front and rear slits 42, and the auxiliary slits 43 may be low grammage regions having a grammage lower than that of the surrounding absorbent core. The auxiliary slit 43 may extend at least in the width direction, and may be curved, diamond-shaped in a plan view, or inverted triangular (having a vertex facing the rear side) in a plan view.

The present invention has been described in detail with reference to the above embodiments, but it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented in modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes, and does not have any limiting meaning to the present invention.

Further, japanese laid-open application No. 2014-260773 filed 24/12/2014 is incorporated herein by reference in its entirety.

Industrial applicability

According to the present invention, an absorbent article can be provided that: leakage can be suppressed by fitting the absorbent core to the wearer's buttocks.

Description of the reference numerals

1. An absorbent article; 3. a protective wing; 4. a hip flap; 10. a skin patch; 11. a surface sheet; 12. a side panel; 20. a non-skin patch; 30. an absorbent body; 31. an absorbent core; 31E, the outer edge of the absorbent core; 311. region 1; 312. a 2 nd region; 313. a 3 rd region; 32. a core cladding; 41. a width slit; 42. front and rear slits (1 st curved portion); 43. an auxiliary slit (2 nd curved portion); 60. a bonding region; 61. 1 st body bonding area; 62. 2 nd body bonding area; 63. a flap adhesive region; 64. a hip flap bond area; 80. a compression section; 81. a drain port compression section; 82. a rear-side compression unit; 83. a hip flap compression; l, the front-back direction; t, the thickness direction; t1, skin-facing surface side; t2, non-skin-facing surface side; w, width direction; s1, a drain contact area; s2, the posterior region; s3, front side area.

Claims

1. An absorbent article having:

an excretory opening contact region opposite the excretory opening of the wearer;

a rear region located rearward of the drain contact region;

an absorbent core disposed in the excretory opening contact region and the rear side region, wherein,

the absorbent core in the back region is provided with: a 1 st curved portion configured to be able to curve convexly toward a wearer side at a widthwise center of the absorbent core in the rear region; a 2 nd curved portion which constitutes a deformation origin point at which the absorbent core in the rear side region is curved in the thickness direction and extends in the width direction,

the outer edge of the 2 nd curved portion is positioned further inward in the width direction than the outer edge of the absorbent core in the back region,

the 2 nd curved portion is formed of a compressed portion that compresses the absorbent core in the thickness direction, and extends obliquely with respect to the width direction.

2. The absorbent article of claim 1,

a rear compression unit is provided on the outer side in the width direction of the 2 nd curved portion and on the inner side in the width direction of the outer edge of the absorbent core, and the rear compression unit is formed by compressing the absorbent core in the thickness direction and extends in the front-rear direction.

3. The absorbent article according to claim 1 or 2, wherein,

the absorbent core has a width slit extending in the width direction between the excretory opening contact region and the back region.

4. The absorbent article according to claim 1 or 2, wherein,

the 2 nd curved portion is provided in plurality at intervals in the front-rear direction.

5. The absorbent article according to claim 1 or 2, wherein,

the 2 nd curved portion extends to the front side as going from the 1 st curved portion toward the outer side in the width direction.

6. The absorbent article according to claim 1 or 2, wherein,

the absorbent article has:

a skin surface sheet located closer to the skin-facing surface side than the absorbent core;

a non-skin-facing sheet located closer to the non-skin-facing surface side than the absorbent core,

no absorbent material is disposed between the skin-facing sheet and the non-skin-facing sheet in the region overlapping the 1 st curved portion.

7. The absorbent article according to claim 1 or 2, wherein,

the absorbent article comprises a non-skin-facing sheet positioned closer to the non-skin-facing surface side than the absorbent core,

an adhesive area coated with an adhesive for fixing the absorbent article to underwear is provided on the non-skin-facing surface of the non-skin-facing sheet,

the 1 st curved portion does not overlap with the adhesion region in the thickness direction.

8. The absorbent article according to claim 1 or 2, wherein,

a hip flap extending outward in the width direction with respect to the outer edge of the absorbent core of the excretory opening contact region is provided in the back region.

9. The absorbent article of claim 8,

the hip flap is provided with a convex hip flap compression portion that protrudes outward in the width direction.

10. The absorbent article according to claim 1 or 2, wherein,

the excretory opening contact region has a middle-high portion located further inward in the width direction than the outer edge of the absorbent core,

the thickness of the mid-height portion is thicker than the thickness of the outer side edge of the absorbent core at the excretory opening contact region.