CN106794081B

CN106794081B - Absorbent article

Info

Publication number: CN106794081B
Application number: CN201580053263.1A
Authority: CN
Inventors: 西谷和也; 木下英之
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2014-10-01
Filing date: 2015-08-25
Publication date: 2020-06-02
Anticipated expiration: 2035-08-25
Also published as: CN106794081A; JP2016067821A; WO2016052007A1; JP6377482B2

Abstract

Provided is an absorbent article which can suppress back leakage when a wearer lies on his back. An absorbent article (1) is provided with: a 1 st curved portion (41) which is adjacent to the drain opening opposing region on the rear side of the drain opening opposing region and extends in the width direction; a 2 nd curved portion (42) located on the rear side of the 1 st curved portion and extending in the width direction; and an intermediate region (R3) located between the 1 st curve portion and the 2 nd curve portion in the front-rear direction. The 1 st curved portion and the 2 nd curved portion are configured to enable the absorbent article to bend in the thickness direction. The weight per unit area of the absorbent material in the intermediate region is lower than the weight per unit area of the absorbent material in the region (R1) opposite the excretion portion. The 1 st curved portion, the 2 nd curved portion, and the intermediate region do not overlap the adhesion region (60) in the thickness direction.

Description

Absorbent article

Technical Field

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

Background

The absorbent article for night use is used in a state where the wearer lies down, and is used for a longer time than the absorbent article for daily use. Therefore, when the absorbent article for night use is used, back leakage is likely to occur. Patent document 1 discloses an absorbent article for night use which prevents back leakage.

The absorbent article of patent document 1 includes: a discharge part facing part arranged opposite to a liquid discharge part of a wearer; and a rear portion disposed on the back side of the spine with respect to the excretion portion facing portion, wherein the absorbent body is provided with a plurality of high-density portions and low-density portions extending in the width direction at a portion located on the rear portion. In the absorbent article of patent document 1, when the body fluid flows rearward, the body fluid is held by the high-density portion having a relatively high density, and the low-density portion having a relatively low density is flexibly deformed to suppress the rear leakage.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2010-136900

Disclosure of Invention

In general, the absorbent article described above has an adhesive region coated with an adhesive for fixing to underwear. The bonded region is provided over substantially the entire region of the absorbent article in the front-rear direction. When the absorbent article is fixed to the undergarment over substantially the entire region in the front-rear direction, the absorbent article follows the deformation when the undergarment deforms in accordance with the deformation of the body when worn.

The applicant conducted various investigations on the deformation of the body of a wearer in a lying down state, and found that: the body of the wearer in the lying state is deformed by the body pressure, and the absorbent article is deformed into an unexpected state.

For example, the hip of the wearer in the supine position is inflated and deflated. At this time, if the absorbent article deforms following the underwear, the following may occur: the absorbent article moves away from the wearer's body creating an unexpected crease and creating a rear leak.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an absorbent article capable of suppressing rear leakage in a state where a wearer lies on his/her back.

In order to solve the above-described problem, an absorbent article (absorbent article 1) of the present disclosure has a front-back direction (front-back direction L) and a width direction (width direction W) that are orthogonal to each other, and includes: an absorbent body (absorbent body 30) having an absorbent core in which absorbent materials are laminated; a skin surface sheet (skin surface sheet 10) which is positioned on the skin-facing surface side of the absorber; a non-skin surface sheet (non-skin surface sheet 20) which is positioned on the non-skin-facing surface side of the absorber; an excretory opening opposing region (excretory opening opposing region R1) which opposes the excretory opening of the wearer; and a bonding region (bonding region 60) provided on the non-skin-facing sheet and coated with a bonding agent for fixing the absorbent article to underwear, the absorbent article including: a 1 st curved portion (1 st curved portion 41) which is adjacent to the drain opening opposing region on a rear side of the drain opening opposing region and extends in the width direction; a 2 nd curved portion (2 nd curved portion 42) located at a rear side of the 1 st curved portion and extending in the width direction; and an intermediate region (intermediate region R3) located between the 1 st curved portion and the 2 nd curved portion in the front-rear direction, the 1 st curved portion and the 2 nd curved portion being configured to enable the absorbent article to bend in a thickness direction, the absorbent material in the intermediate region having a lower weight per unit area than the absorbent material in the region facing the excretion portion, the 1 st curved portion, the 2 nd curved portion, and the intermediate region not overlapping with the adhesive region in the thickness direction.

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.

3 fig. 33 3 is 3 a 3 schematic 3 sectional 3 view 3 of 3 the 3 section 3 a 3- 3 a 3 shown 3 in 3 fig. 31 3. 3

Fig. 4 (a), 4 (b), and 4 (c) are schematic views for explaining a wearing state of the absorbent article shown in fig. 1.

Fig. 5 is a plan view of an absorbent article according to a modification.

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. In addition, 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. 3 fig. 33 3 is 3 a 3 sectional 3 view 3 a 3- 3 a 3 shown 3 in 3 fig. 31 3. 3 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 along a front side (ventral side) and a back side (dorsal side) of the wearer; a width direction W orthogonal to the front-rear direction L; and a thickness direction T extending along the skin-facing surface side T1 and the non-skin-facing surface side T2 of the wearer.

The absorbent article 1 includes: an absorbent body 30 having an absorbent core in which absorbent materials are laminated; a skin sheet 10 located closer to the skin-facing surface side T1 than the absorber 30; and a non-skin-facing surface sheet 20 located 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 the outer edge (outer end in the width direction) of the surface 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 materials as 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 water-repellent. The side panels 12 are arranged on the outer edge of the main body 2, the wing 3, and the hip flap (japanese: ヒップフラップ)4, which will be discussed later.

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 sheet obtained by bonding an air-permeable resin film to a laminated nonwoven fabric mainly composed of a polyethylene sheet, polypropylene, or the like, an air-permeable resin film, a nonwoven fabric such as a spun-bonded nonwoven fabric, or a spun-laced nonwoven fabric, or the like.

The absorber 30 has: an absorbent core 31 formed by laminating absorbent materials; a core wrap 32 covering the absorbent core 31. Examples of the absorbent material include hydrophilic fibers, pulp, and SAP.

The absorbent article 1 has a main body 2, wing portions 3, and hip flaps 4. The main body 2 is located at the center of the absorbent article 1 in the width direction W and extends in the front-rear direction L. The wing portions 3 and the hip flaps 4 extend outward in the width direction W with respect to the outer edge 2E of the main body portion 2. The outer side edge 2E of the main body 2 is aligned with the outer side edge 30E of the absorber 30.

The main body 2 includes a skin sheet 10, a non-skin sheet 20, and an absorber 30. More specifically, the main body 2 includes the top sheet 11, a part of the side sheet 12, the non-skin surface sheet 20, and the absorber 30.

The wing portions 3 have side sheets 12 and a non-skin-facing sheet 20. The wing sections 3 are configured to be foldable toward the non-skin surface sheet 20, and to be foldable toward the non-skin facing surface of the crotch section of the undergarment during use. The hip flaps 4 are located behind the wings 3. 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.

The inner edge 12E of the side sheet 12 is folded back outward in the width direction W along the front-rear direction L. An extensible member 91 that extends and contracts in the front-rear direction L is disposed between the folded side sheets 12. The inner edge 12E of the side sheet 12 is not joined to the surface sheet 11. The inner edge 12E of the side sheet 12 and the stretchable member 91 constitute a standing leakage preventive rib. The stretchable member 91 is disposed across the 1 st curved portion 41 and the 2 nd curved portion 42, which will be discussed later, in the front-rear direction L. More specifically, the front end edge 91F of the stretchable member 91 is located forward of the 1 st curved portion 41, and the rear end edge 91R of the stretchable member 91 is located rearward of the 2 nd curved portion 42.

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 main body bonding region 61 and a 2 nd main body bonding region 62 arranged on the main body 2; a wing part bonding region 63 disposed on the wing part 3; and a hip flap adhesive area 64 disposed on the hip flap 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.

A plurality of bonding regions extending in the front-rear direction are provided at intervals in the width direction on the front side of the 1 st curved portion 41 and the rear side of the 2 nd curved portion 42. Specifically, the 1 st main body bonding region 61 located on the front side of the 1 st curved portion 41 and the 2 nd main body bonding region 62 located on the rear side of the 2 nd curved portion 42 have a plurality of bonding regions having a length in the front-rear direction longer than a length in the width direction. The 1 st main body bonding region 61 and the 2 nd main body bonding region 62 are arranged at intervals in the width direction.

The adhesive area 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 absorbent article 1 is provided with a 1 st curved portion 41 and a 2 nd curved portion 42. The 1 st curved portion 41 and the 2 nd curved portion 42 are located on the rear side of the center of the wing portion 3 in the front-rear direction and on the front side of the rear end edge of the absorbent core 31. The 1 st curved portion 41 and the 2 nd curved portion 42 are configured to extend in the width direction W, and to enable the absorbent article 1 to bend in the thickness direction T. The rear end edge of the absorbent core of the absorbent body 30 of the present embodiment is substantially aligned with the rear end edge of the absorbent body. The 1 st curve 41 is adjacent to the drain port opposing region R1 on the rear side of the drain port opposing region R1. The 2 nd curve portion 42 is located at the rear side of the 1 st curve portion 41.

The absorbent article 1 has: an excretory opening opposing region R1 which opposes the excretory opening of the wearer; a rear region R2 adjacent to the 2 nd curve 42 rearward of the 2 nd curve 42; and an intermediate region R3 located between the 1 st curved portion 41 and the 2 nd curved portion 42 in the front-rear direction L. The excretory opening opposing region R1 is a region from the leading edge of the middle height portion 33 to the 1 st curved portion 41. The rear region R2 is a region from the rear end edge 30R of the absorbent body 30 to the 2 nd curved portion 42. The intermediate region R3 is a region between the 1 st curve 41 and the 2 nd curve 42.

The weight per unit area of the absorbent material of the intermediate region R3 is lower than the weight per unit area of the absorbent material of the excretory opening opposing region R1, and lower than the weight per unit area of the absorbent material of the rear region R2. The intermediate region R3 may be a region in which the absorbent material has a lower weight per unit area than the absorbent material in the excretory opening facing region R1 or the like, and may be a region in which the weight per unit area is 0 or a region in which the absorbent material mixed from the excretory opening facing region R1 or the like is arranged, although the weight per unit area is designed to be 0.

The 1 st curved portion 41 serves as a boundary of the stiffness change. The region forward of the 1 st curved portion 41 has a different rigidity from the region rearward of the 1 st curved portion 41. More specifically, the weight per unit area of the absorbent material in the region forward of the 1 st curved portion 41 is higher than the weight per unit area of the absorbent material in the region rearward of the 1 st curved portion 41. Therefore, the region on the front side of the 1 st curved portion 41 has higher rigidity than the region on the rear side of the 1 st curved portion 41.

The 2 nd curved portion 42 is located rearward of the 1 st curved portion 41. The 2 nd curve 42 is a boundary of the stiffness change. The region forward of the 2 nd curved portion 42 has a different rigidity from the region rearward of the 2 nd curved portion 42. More specifically, the basis weight of the absorbent material in the region on the front side of the 2 nd curved portion 42 is lower than the basis weight of the absorbent material in the region on the rear side of the 2 nd curved portion 42. Therefore, the region on the front side of the 2 nd curved portion 42 has lower rigidity than the region on the rear side of the 2 nd curved portion 42.

The 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 do not overlap the bonding region 60 in the thickness direction T. The 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 are provided in a non-bonded region where no bonded region is arranged in a plan view. The 1 st body bonding region 61 is disposed forward of the 1 st curved portion 41, and the 2 nd body bonding region 62 is disposed rearward of the 2 nd curved portion 42. The 1 st body bonding region 61 overlaps the excretory opening opposing region R1 in the thickness direction. The rear end edge 61R of the 1 st body bonding region 61 is located forward of the 1 st curved portion 41, and the front end edge 62F of the 2 nd body bonding region 62 is located rearward of the 2 nd curved portion 42.

The length of the intermediate region R3 in the front-rear direction L is longer than the thickness of the absorbent body 30 at the portion adjacent to the 1 st curved portion 41 in the excretion portion-corresponding region R1. In the configuration in which the thickness of the absorbent body 30 in the excretory opening opposing region R1 varies, the length of the intermediate region R3 in the front-rear direction may be longer than the thickness of the absorbent body 30 in the portion adjacent to the 1 st curved portion 41, or may be shorter than the thickness of the other portion (for example, the central portion in the front-rear direction) of the excretory opening opposing region R1.

The length of the intermediate region R3 in the front-rear direction is preferably 10mm to 50 mm. In the configuration in which the length of the intermediate region R3 in the front-rear direction varies, the length of the center of the intermediate region R3 in the front-rear direction may be 10mm or more and 50mm or less. More preferably, the length of the intermediate region R3 in the front-rear direction is 10mm or more and 30mm or less.

It is desirable that the distance L1 between the center 41WC in the width direction of the 1 st curved portion 41 and the center in the front-rear direction of the drain port opposing region R1 be 25mm or more. Further, it is desirable that the distance L1 between the center 41WC in the width direction of the 1 st curved portion 41 and the center in the front-rear direction of the drain opening opposing region R1 is 80mm or less. In the configuration in which the 1 st curved portion 41 has a predetermined length in the front-rear direction, the distance between the center in the width direction of the front end edge of the 1 st curved portion 41 and the center in the front-rear direction of the region facing the excretion portion may be 25mm or more and 80mm or less.

The 1 st curved portion 41 and the 2 nd curved portion 42 are curved convexly rearward in a plan view. More specifically, the center of the 1 st curved portion 41 in the width direction is located rearward of the outer edge of the 1 st curved portion 41. The center of the 1 st curved portion 41 in the width direction is convex toward the rear. The center in the width direction of the 2 nd curved portion 42 is located rearward of the outer edge of the 2 nd curved portion 42. The center of the 2 nd curved portion 42 in the width direction is convex toward the rear. Further, the distance in the front-rear direction between the 1 st curved portion 41 and the 2 nd curved portion 42 may be constant or may vary.

The outer edge 41E of the 1 st curve 41 and the outer edge 42E of the 2 nd curve 42 are located at the outer edges of the absorbent core 31. That is, the 1 st curved portion 41 and the 2 nd curved portion 42 are formed over the entire width direction area of the absorbent core. The absorbent core 31 is divided in the front-rear direction L by the 1 st curved portion 41 and the 2 nd curved portion 42. Further, the outer edge of the absorbent core 31 of the absorbent body 30 of the present embodiment is substantially aligned with the outer edge of the absorbent body 30. Thus, in the drawings, the outer edge 41E of the 1 st curved portion 41 and the outer edge 42E of the 2 nd curved portion 42 are shown in alignment with the outer edge 30E of the absorbent body 30.

The absorber 30 has a middle-high portion 33 located inward in the width direction of the outer edge 30E of the absorber 30. The intermediate height portion 33 is located in the excretion portion-corresponding region R1 and is located inward in the width direction of the portion of the outer edge 30E of the absorbent body 30 located in the excretion portion-corresponding region R1. In fig. 1, the middle-high portion 33 is indicated by hatching. The thickness of the middle height portion 33 is larger than the thickness of the outer edge 30E of the absorbent body 30 at the excretion portion corresponding region R1. The absorbent material of the middle height portion 33 has a higher weight per unit area than the absorbent material of the portion of the outer edge 30E of the absorbent body 30 located in the excretion portion-corresponding region R1. The middle high portion 33 is located on the rear side in the drain opening opposing region R1, and is adjacent to the 1 st curved portion 41.

The rear end edge of the middle high portion 33 is aligned with the 1 st curved portion 41. In the present embodiment, the length of the mid-high portion 33 in the front-rear direction is 95 mm. The front end edge of the mid-height portion 33 is located at a position forward 95mm from the rear end edge of the mid-height portion 33. Preferably, the center 33LC in the front-rear direction of the mid-high portion 33 is the center in the front-rear direction of the region disposed so as to face the drain opening. Preferably, the center 33LC in the front-rear direction of the middle-high portion 33 coincides with the center of the wing portion in the front-rear direction. The center 33LC in the front-rear direction of the middle-high portion 33 abuts on a portion of the undergarment where the length in the width direction is shortest in the crotch portion.

In the case of a structure in which the absorber has two absorption layers, the absorber in the middle-high portion may have two absorption layers, and the absorber may have only 1 absorption layer in a portion other than the middle-high portion. In addition, as a modification, the absorbent body of the middle-high portion may have an auxiliary sheet for absorbing body fluid, and the absorbent body may have a structure in which the auxiliary sheet is not provided in a portion other than the middle-high portion.

in a cross section along the front-rear direction L of the absorbent article 1 shown in fig. 3, an angle α formed by the rear surface 33RS of the middle high portion 33 extending from the rear end edge 33R of the middle high portion 33 along the thickness direction T and the non-skin-facing surface of the middle high portion 33 is larger than an angle β formed by the front surface 33FS of the middle high portion 33 extending from the front end edge 33F of the middle high portion 33 along the thickness direction T and the non-skin-facing surface of the middle high portion 33, the angle α being an angle formed by the rear surface 33RS of the middle high portion 33 and the non-skin-facing surface of the middle high portion 33 extending forward from the rear end edge 33R of the middle high portion 33, and the angle β being an angle formed by the front surface 33FS of the middle high portion 33 and the non-skin-facing surface of the middle high portion 33 extending rearward from the front end edge 33F of the middle high portion 33.

The measurement of "thickness of absorbent body" in the present specification can be performed by the following measurement method.

When the absorbent article 1 is sealed in a package or the like, a sample is taken out of the package, and left in this state for 12 hours in an atmosphere of 20 ℃ ± 2 ℃ and a relative humidity of 60% ± 5% RH.

The measurement position is the center of the absorbent body in the product width direction. In the measurement, the measurement is performed in a state in which the stretchable member of the absorbent article is stretched, not in a state in which the absorbent article is contracted. In addition, the skin sheet other than the absorbent body, such as a non-skin sheet, and the skin sheet other than the absorbent body are removed. A sample having a size of 30 mm. times.30 mm was prepared using a dial gauge PEACOCK manufactured by Kawasaki, K.K., a gauge having a diameter of 10mm, and the thickness of the sample was measured. The measuring pressure of the measuring device on the sample is 3g/cm²The manner of (2) is adjusted. Here, the above measurement was performed on 10 samples in the respective states, and the results were analyzedThe average value is set as the length.

In the present specification, "the basis weight and density of the absorbent body" can be measured by the following measurement method.

When the absorbent article 1 is sealed in a package or the like, a sample that has been left to stand in an atmosphere at 20 ℃ ± 2 ℃ and a relative humidity of 60% ± 5% RH for 12 hours is used in this state after being taken out from the package.

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 the weight and density per unit area are measured. Next, a portion whose weight per unit area and density are to be measured is cut out from the absorbent article, and the weight of the cut portion is measured. Next, the 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 basis weight is calculated based on the weight of the absorbent body and the area of the portion where the basis weight and density are to be measured. The density was calculated based on the weight per unit area and the thickness.

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

When the absorbent article 1 is sealed in a package or the like, a sample that has been left for 12 hours in an atmosphere of 20 ℃ ± 2 ℃ and a relative humidity of 60% ± 5% RH is used in a state of being taken out from the package.

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

in the absorbent article packaged in the package, the package is opened, the folded absorbent article is unfolded, a photograph is taken from the side of the absorbent article, and the angles α and β shown in fig. 3 are measured by an indexer.

(2) Wearing state of absorbent article

Next, the wearing state of the absorbent article 1 configured as above will be described. 3 fig. 34 3 is 3 a 3 sectional 3 view 3 taken 3 on 3 the 3 basis 3 of 3 the 3 section 3 a 3- 3 a 3 in 3 fig. 31 3 in 3 a 3 state 3 where 3 the 3 absorbent 3 article 31 3 is 3 worn 3 on 3 a 3 wearer 3. 3 Fig. 4 (a) shows a state in which a wearer wearing the absorbent article 1 stands. The excretory opening opposing region R1 of the absorbent article 1 is secured to the crotch portion of underwear (the portion opposing the wearer's crotch region) by the 1 st body adhesive region 61. The rear region R2 of the absorbent article 1 is fixed to the rear part of the crotch portion of underwear (the part facing the buttocks of the wearer) by the 2 nd body adhesive region 62. In a state where the wearer stands, the buttocks of the wearer are swollen.

Fig. 4 (b) is a state in which the cross-sectional view shown in fig. 4 (a) is rotated by 90 degrees, and shows a state in which the wearer lies on the back. The state where the wearer lies on his back shows that the body of the wearer is pressed by the bedding, but fig. 4 (b) shows that the body of the wearer is not pressed by the bedding for convenience of explanation. Fig. 4 (b) illustrates a line LB indicating bedding. The region where the line LB of the bedding overlaps the body is a region where the body is deformed in a state where the body is pressed by the bedding and the body is lying down.

Fig. 4 (c) shows a state in which the body of the wearer lying on his back is pressed by the bedding and deformed. In the state shown in fig. 4 (c), the region where the body and bedding lines overlap in fig. 4 (b) is deformed. More specifically, the buttocks of the wearer are swollen and collapsed, and a part of the buttocks of the wearer is flat. The crushed parts of the buttocks move toward the crotch and swell from the roots of the legs toward the front sides of the legs. The 2 nd curved portion 42 is disposed at the end portion of the hip portion on the hip portion side of the crushed portion of the hip portion, and the 1 st curved portion 41 is disposed at the end portion of the hip portion on the crotch portion side. Therefore, the intermediate region R3 of the absorbent article deforms along the swollen and collapsed portions of the buttocks and is disposed along the collapsed portions of the buttocks.

(3) Action and Effect

The excretory opening opposing region is a region opposing the excretory opening of the wearer. A 1 st curved portion 41 and a 2 nd curved portion 42 are provided behind the wing portion 3. The deformation starting point of the 1 st curved portion 41 and the deformation starting point of the 2 nd curved portion 42 are formed at a position rearward of the excretory opening of the wearer in the absorbent article 1. Therefore, the absorbent article 1 is flexibly deformed along the deformation of the buttocks when the wearer in a lying state is deformed by the body pressure.

The bonded region 60 does not overlap the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 in the thickness direction T. The portion of the absorbent article 1 fixed to the undergarment (the portion provided with the adhesive region) is likely to deform following the undergarment. For example, when the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 are attached to underwear via adhesive regions, if the body is crushed in the supine position, the absorbent article deforms to follow the underwear. The absorbent article is unexpectedly deformed to follow the underwear, and a gap may be formed between the wearer and the absorbent article. However, the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 are not fixed to underwear, and therefore can be freely deformed. Therefore, even when the excretory opening facing region R1 and the rear region R2 are deformed together with the undergarment, the force transmitted from the undergarment is divided by the intermediate region R3, and the deformation of the wearer's body can be absorbed by the intermediate region R3.

Further, an intermediate region R3 in which the weight per unit area of the absorbent material is relatively low is provided between the 1 st curved portion 41 and the 2 nd curved portion 42. The absorbent material of the intermediate region R3 has a low weight per unit area and is therefore easily deformed flexibly. When the crushed portion of the buttocks moves to the crotch side, the deformation of the buttocks is absorbed by the intermediate region R3, and the excretory opening opposing region R1 and the rear region R2 are likely to be continuously brought into contact with the wearer. The excretory opening opposing region R1 and the rear region R2 are divided by the intermediate region R3, and transmission of force from the excretory opening opposing region R1 to the rear region R2 can be suppressed.

A plurality of bonding regions extending in the front-rear direction L are provided at intervals in the width direction on the front side of the 1 st curved portion 41 and the rear side of the 2 nd curved portion 42. Specifically, the 1 st and 2 nd main

body bonding regions

61 and 62 have a plurality of bonding regions having a length in the front-back direction L longer than a length in the width direction W, and the bonding regions are arranged at intervals in the width direction. In the structure having the plurality of adhesive regions, since gaps are formed between the adhesive regions, there is room for following the fine movement of the body while being held in the undergarment after wearing, as compared with the structure in which the 1 st main body adhesive region 61 and/or the 2 nd main body adhesive region 62 are continuously coated. Therefore, the absorbent article has an effect of reducing discomfort because small wrinkles are generated but large wrinkles are less likely to be generated.

The length of the intermediate region R3 in the front-rear direction L is 10mm or more. For example, when the length of the intermediate region in the front-rear direction is less than 10mm, the swollen and crushed portions of the buttocks may not be sufficiently absorbed. On the other hand, when the length of the intermediate region R3 in the front-rear direction is 10mm or more, deformation of the buttocks can be effectively absorbed.

The length of the intermediate region R3 in the front-rear direction L is 50mm or less. By setting the length of the intermediate region R3 in the front-rear direction L to 50mm or less, it is possible to absorb body deformation by the intermediate region R3 and to absorb body fluid that has flowed to the hip side by the rear region R2. Therefore, menstrual blood can be inhibited from flowing to the hip portion side. On the other hand, in the configuration in which the length of the intermediate region R3 in the front-rear direction L is longer than 50mm, the user feels uneasy about the menstrual blood flowing toward the hip portion side, and it is difficult to obtain a feeling of comfort when wearing the diaper.

A distance L1 between the center 41WC of the 1 st curved portion 41 in the width direction W and the center of the front-rear direction L of the drain opening opposing region R1 is 25mm or more and 80mm or less. As a result of various investigations, the present applicant has found that the deformation starting point on the crotch side of the hip is often located more rearward than the center of the excretory opening opposing region R1 by 25mm or more in the front-rear direction L. Therefore, when the distance L1 between the center 41WC of the 1 st curved portion 41 in the width direction W and the center of the front-rear direction L of the excretory opening opposing region R1 is 25mm or more, the 1 st curved portion 41 and the intermediate region R3 are located at the deformation starting point on the crotch side of the buttocks. Further, if the distance L1 between the center 41WC of the 1 st curved portion 41 in the width direction W and the center of the front-rear direction L of the excretory opening opposing region R1 exceeds 80mm, the buttocks will bulge out to the maximum extent, and the 1 st curved portion 41 and the intermediate region will be located at the portion where the body pressure of the buttocks is applied to the maximum extent, which may cause a sense of discomfort.

The 1 st curved portion 41 and the 2 nd curved portion 42 are curved convexly rearward in a plan view. The portion curved convexly toward the rear bulges convexly toward the rear together with the underwear when lying down, and is pushed out in a direction away from the body. When the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 are separated from the body, the deformation caused by bending from the back can be absorbed by the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3. Therefore, the excretory opening opposing region R1 and the rear region R2 are maintained in a shape that follows the curve of the body, and the entire absorbent article is arranged along the curve of the body.

The middle high portion 33 is adjacent to the 1 st curved portion 41 in the drain opening opposing region R1. The thickness of the intermediate height portion 33 is larger than the thickness of the region of the absorbent body 30 other than the intermediate height portion. By the middle-high portion 33 of the excretory opening opposing region R1 being adjacent to the 1 st curved portion 41, the difference in rigidity and the difference in thickness between the excretory opening opposing region R1 and the intermediate region R3 become large, forming a more definite deformation starting point. Thus, the intermediate region R3 and the excretory opening opposing region R1 can be arranged along the body in different shapes.

the angle α formed by the rear surface 33RS of the middle-high portion 33 and the non-skin-facing surface of the middle-high portion 33 is larger than the angle β formed by the front surface 33FS of the middle-high portion 33 and the non-skin-facing surface of the middle-high portion 33, and the angle formed by the side surface of the absorbent body and the non-skin-facing surface of the absorbent body is larger, and the absorbent body is likely to bend starting from the non-skin-facing surface, as compared to the case where the angle formed by the side surface of the absorbent body and the non-skin-facing surface of the absorbent body is smaller, for example, when the angle formed by the front surface of the middle-high portion 33 is larger, a bending start point is formed on the front surface of the middle-high portion 33, and the adhesiveness of the front surface of the middle-high portion 33 can be maintained, while the angle formed by the rear surface of the middle-high portion 33 and the non-skin-facing surface is larger, and a bending start point is likely to be formed on the rear surface of the middle-high portion 33.

The stretchable member 91 is disposed across the 1 st curved portion 41 and the 2 nd curved portion 42 in the front-rear direction L. Therefore, the contraction of the stretchable member 91 allows the excretion portion facing region R1 on the front side of the 1 st curved portion 41 and the rear region R2 on the rear side of the 2 nd curved portion 42 to approach each other. Therefore, even when wrinkles occur in the intermediate region R3 due to deformation of the 1 st curved portion 41 and the like, the wrinkles can be concentrated.

The outer edge 41E of the 1 st curve 41 and the outer edge 42E of the 2 nd curve 42 are located at the outer edges of the absorbent core 31. Thus, the entire width-directional region of the absorbent core 31 is easily deformed with the 1 st curved portion 41 and the 2 nd curved portion 42 as starting points. Further, the drain port facing region R1 and the rear region R2 are divided in the front-rear direction L, and therefore, the transmission of the deformed state of one to the other can be suppressed.

Further, the length of the intermediate region R3 in the front-rear direction L is longer than the thickness of the absorbent body 30 at the portion of the excretory opening opposing region R1 adjacent to the 1 st curved portion 41. The deformation of the buttocks is absorbed by the intermediate region R3, and a step for absorbing the deformation of the buttocks is formed behind the excretory opening opposing region R1. Thus, the region on the front side of the intermediate region R3 can be disposed so as to face the excretory opening of the wearer, and the region on the rear side of the intermediate region R3 can be disposed so as to face the buttocks of the wearer. Therefore, the gap between the absorbent article and the body can be reduced, and back leakage can be suppressed.

(4) Absorbent article according to modification

Next, an absorbent article 1A of a modified example will be described. In the description of the absorbent article 1A of the modified example, the description will be given of the structure different from that of the above-described embodiment, and the same reference numerals are given to the same structure as that of the above-described embodiment, and the description thereof will be omitted.

The absorbent article 1A of the modified example does not have the wing sections 3 and the leakage preventing cuffs. The absorbent article 1A of the modified example is formed with the compressed portion 80. The shapes of the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 of the absorbent article 1A of the modified example are different from the shapes of the 1 st curved portion 41, the 2 nd curved portion 42, and the intermediate region R3 of the absorbent article 1 of the embodiment.

The absorbent article 1A of the modified example includes a compressed portion 80 in which at least the absorber 30 is compressed in the thickness direction. The compressed portion 80 of the present embodiment is formed by compressing the topsheet 11 and the absorbent body 30 in the thickness direction. The compression part 80 includes a 1 st compression part 81 disposed in the drain port facing region R1 and a 2 nd compression part 82 disposed in the rear region R2.

The 1 st compressed part 81 is formed along the outer edge of the mid-height part 33. The 2 nd compression part 82 is formed in the rear part 34. The 1 st compression unit 81 includes: a pair of 1 st front-rear compressing portions 81L extending in the front-rear direction; and a 1 st width compressing portion 81W located forward of the 1 st front-rear compressing portion 81L and extending in the width direction. The 1 st front-rear compressing portion 81L is located on the outer side in the width direction than the center in the width direction of the drain port opposing region R1.

The 1 st front-rear compressing portion 81L may be inclined with respect to a straight line along the front-rear direction L, and an angle (acute angle side) formed by the straight line along the front-rear direction L and the 1 st front-rear compressing portion 81L may be 45 degrees or less. On the other hand, the 1 st width compressing portion 81W may be formed to be inclined with respect to a straight line along the width direction W, and an angle (acute angle side) formed by the straight line along the width direction W and the 1 st width compressing portion 81W may be less than 45 degrees.

The middle high portion 33 is surrounded by the 1 st width compression portion 81W, the pair of 1 st front-rear compression portions 81L, and the 1 st curved portion 41. The pair of 1 st front-rear compressing portions 81L are arranged along the outer edge of the mid-height portion 33. Since the compression portion 80 surrounds the middle-high portion 33, the bulge of the middle-high portion 33 is easily maintained, and the middle-high portion 33 is more closely attached to the excretory opening of the wearer.

The 1 st curved portion 41 and the 2 nd curved portion 42 are linear shapes along the width direction. Further, the outer edge 41E of the 1 st curved portion 41 and the outer edge 42E of the 2 nd curved portion 42 are located on the outer side in the width direction than the 1 st front-rear compressed portion 81L. In the configuration in which the position of the 1 st front-rear compressed portion 81L in the width direction changes as in the modification shown in fig. 5, at least the rear end edge of the 1 st front-rear compressed portion 81L (the portion closest to the 1 st curved portion 41 and the 2 nd curved portion 42) may be positioned further outward in the width direction than the 1 st front-rear compressed portion 81L.

In order to maintain the structure of fitting to the body, it is preferable that the excretory opening opposing region R1 located forward of the 1 st curved portion 41 and the rear region R2 located rearward of the 2 nd curved portion 42 are reliably divided. When the absorbent article 1 is worn, the excretory opening facing region R1 and the 1 st curved portion 41 are sandwiched between the legs of the wearer, and contract and bulge toward the skin-facing surface side. Thus, the absorbent article 1 fits the body. On the other hand, the 2 nd curved portion 42 and the rear region R2 maintain a flat shape, and are good in both the fit and the comfort. Therefore, if the width of the outer edge of the 1 st curved portion 41 is narrower than that of the 1 st front-rear compression portion, the movement on the front side such as the excretion portion facing region is interlocked, wrinkles are generated in the vicinity of the deformation starting point (mainly the 1 st curved portion 41), and it is difficult to obtain the dividing effect between the excretion portion facing region and the rear region. However, since the outer edge 41E of the 1 st curved portion 41 and the outer edge 42E of the 2 nd curved portion 42 are located on the outer side in the width direction than the compressed portion 80, the deformation starting point formed by the 1 st curved portion 41 and the 2 nd curved portion 42 can be formed in the region from the middle height portion 33 to the outer side in the width direction than the compressed portion 80. Therefore, the entire width-direction region of the middle-high portion can be easily deformed, and a dividing effect between the drain opening opposing region R1 and the rear region R2 can be obtained.

Further, the absorbent core 31 is disposed outside the 1 st curved portion 41 in the width direction, outside the middle region R3 in the width direction, and outside the 2 nd curved portion 42 in the width direction. Thus, the absorbent core of the modified example is not divided by the 1 st curved portion 41 and the 2 nd curved portion 42 in the front-rear direction. For example, if the absorbent core is divided in the front-back direction by the 1 st curved portion 41 and the 2 nd curved portion 42, the absorbent core may be deformed from the 1 st curved portion 41 and the 2 nd curved portion 42 before being worn, and unexpected wrinkles may occur.

However, since the absorbent core is not divided by the 1 st curved portion 41 and the 2 nd curved portion 42 in the front-back direction, it is possible to suppress deformation from the 1 st curved portion 41 and the 2 nd curved portion 42 as starting points in a state before wearing, and to suppress occurrence of unexpected wrinkles.

(5) Other embodiments

The absorbent article of the present embodiment is a sanitary napkin for night use, but may be a sanitary napkin for daily use as another embodiment. The sanitary napkin may not include the hip flaps.

While the present invention has been described in detail with reference to the above embodiments, 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 modified and implemented as a modified form 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 meaning of limiting the present invention.

(6) Comparative evaluation

Next, comparative evaluation of the length of the intermediate region will be described. Table 1 shows the comparative evaluation results of the lengths of the intermediate regions. In the comparative evaluation test, the absorbent articles of examples 1 to 4 and the absorbent articles of comparative examples 1 to 3 were compared, and the state of maintaining the adhesiveness and the feeling of discomfort in the absorbency due to the appearance were evaluated. The absorbent articles of examples 1 to 4 and the absorbent articles of comparative examples 1 to 3 have the same structure except that the intermediate region R3 has a different length in the front-rear direction.

[ Table 1]

	Length of the middle zone (mm)	Adhesive property	Uneasiness to absorption
				Example 1	10	○	○
Example 2	20	○	○
				Example 3	30	○	○
Example 4	50	○	○
				Comparative example 1	0	×	○
Comparative example 2	5	×	○
				Comparative example 3	60	○	×

20 women who used sanitary napkins were subjected to a test for comparative evaluation. In the evaluation test, the subject sample was identified and used by the practitioner, and the following questions were answered.

question 1 "whether or not the fit was maintained as compared with a sanitary napkin that was used in ordinary times". A sample in which the ratio of the number of persons who answered "sustainable" to this question 1 was 65% or more was regarded as good in sensory evaluation and evaluated as O.A sample in which the ratio of the number of persons who answered "sustainable" to question 1 was less than 65% was regarded as poor in sensory evaluation and evaluated as ○.

question 2 "there was less anxiety to absorbency due to appearance (or no anxiety was generated) than a sanitary napkin used normally", a sample in which the ratio of the number of persons who answered "less anxiety" or "no anxiety" in question 2 was 65% or more was regarded as good in sensory evaluation and evaluated as ○.

The following results can be obtained: the absorbent articles of examples 1 to 4 had lengths in the front-rear direction of the intermediate regions of 10 to 50mm, and were excellent in both the maintenance evaluation of the fit and the evaluation of the feeling of uneasiness of the absorbent article. From the results, it was found that: the length of the intermediate region in the front-rear direction is preferably 10mm or more and 50mm or less. More specifically, it can be seen that: by making the length of the intermediate region in the front-rear direction 10mm or more, good results are obtained with respect to the adhesiveness. In addition, it is known that: by setting the length of the intermediate region to 50mm or less, the feeling of uneasiness in absorbency can be suppressed.

Next, the pushed amount of the crushed hip portion of the supine wearer toward the crotch side was measured. The pushed-out amount is a distance between the crotch-side end (P1 in fig. 4 (c)) of the collapsed hip of the wearer in the supine position and the leg-side end (P2 in fig. 4 (c)) of the pushed-out hip. The pushed amount of 5 subjects was measured. The measurement results are shown in table 2.

[ Table 2]

	Pushing amount (mm)
		Experimenter 1	20
Experimenter 2	15
		Experimenter 3	25
Experimenter 4	30
		Experimenter 5	10

From the measurement results, it was found that: the push-out amount of the buttocks is 10mm to 30 mm. Thus, it can be seen that: by setting the length of the intermediate region in the front-rear direction to 10mm or more, it is possible to cover the bulge of the hip of the wearer from the end portion on the crotch side of the crushed portion to the leg-side end portion of the hip pushed out.

The contents of 2014-203197 of the Japanese patent application laid out on 10/1/2014 are incorporated herein by reference in their entirety.

Industrial applicability

According to the present invention, an absorbent article capable of suppressing back leakage in a state where a wearer lies on his back is provided.

Description of the reference numerals

1. An absorbent article; 2. a main body portion; 2E, outer edge; 3. a wing portion; 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; 33. a mid-high section; 41. the 1 st curved part; 42. a 2 nd curved part; 60. a bonding region; 61. 1 st body bonding area; 62. 2 nd body bonding area; 63. a wing bonding region; 64. a hip flap bond area; 80. a compression section; 81. a 1 st compression section; 82. a 2 nd compression part; 91. a stretchable member; r1, area opposite to the excretory opening; r2, rear area; r3, middle region; l, the front-back direction; t, the thickness direction; t1, skin-facing surface side; t2, non-skin-facing surface side; w, width direction.

Claims

1. An absorbent article having a front-back direction and a width direction orthogonal to each other,

the absorbent article has:

an absorbent body having an absorbent core in which absorbent materials are laminated;

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

a non-skin surface sheet located on a non-skin-facing surface side of the absorber;

an excretory opening opposing region which opposes the excretory opening of the wearer;

an adhesive region provided on the non-skin-facing sheet and coated with an adhesive for fixing the absorbent article to underwear,

the absorbent article is provided with:

a 1 st curved portion adjacent to the drain opening opposing region on a rear side of the drain opening opposing region and extending in the width direction;

a 2 nd curved portion located at a rear side of the 1 st curved portion and extending in the width direction; and

an intermediate region located between the 1 st curved portion and the 2 nd curved portion in the front-rear direction,

the 1 st curved portion and the 2 nd curved portion are configured to enable the absorbent article to bend in a thickness direction,

the weight per unit area of the absorbent material of the intermediate region is lower than the weight per unit area of the absorbent material of the region opposite the discharge opening,

the 1 st curved portion, the 2 nd curved portion, and the intermediate region do not overlap with the bonding region in a thickness direction,

the length of the intermediate region in the front-rear direction is 10mm to 30mm,

the 1 st curved part is curved in a convex shape toward the rear, the 2 nd curved part is curved in a convex shape toward the rear in a plan view,

the adhesive region includes a 1 st main body adhesive region and a 2 nd main body adhesive region arranged to overlap with the absorber,

the 1 st main body bonding region is separated from the 2 nd main body bonding region in the front-rear direction and is disposed in a position forward of the 2 nd main body bonding region.

2. The absorbent article of claim 1,

a distance between the center in the width direction of the 1 st curved portion and the center in the front-rear direction of the region facing the excretion portion is 25mm or more and 80mm or less.

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

a middle-high portion that is located inward in the width direction from an outer edge of the absorbent body in the excretion opening-corresponding region and that has a thickness greater than a thickness of an outer edge of the absorbent body in the excretion opening-corresponding region is provided in the excretion opening-corresponding region,

the 1 st curved portion is adjacent to the middle high portion.

4. The absorbent article according to claim 3,

in the cross section of the absorbent article in the front-rear direction, an angle formed by a rear surface of a mid-high portion extending from a rear end edge of the absorbent body of the mid-high portion in the thickness direction and the non-skin-facing surface of the mid-high portion is larger than an angle formed by a front surface of the mid-high portion extending from a front end edge of the mid-high portion in the thickness direction and the non-skin-facing surface of the mid-high portion.

5. The absorbent article according to claim 3,

the absorbent article includes a compressed portion formed by compressing the absorbent body in the thickness direction,

the compression portion is disposed along an outer edge of the mid-height portion.

6. The absorbent article according to claim 4,

7. The absorbent article according to claim 5 or 6, wherein,

the outer edge of the 1 st curved portion and the outer edge of the 2 nd curved portion are located on the outer side in the width direction than the compressed portion.

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

the absorbent article comprises a stretchable member stretchable in the front-rear direction,

the stretchable member is disposed across the 1 st curved portion and the 2 nd curved portion in the front-rear direction.

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

the outer edge of the 1 st curved portion and the outer edge of the 2 nd curved portion are located at the outer edge of the absorbent body.

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

the absorbent core has portions disposed outside the 1 st curved portion in the width direction, outside the middle region in the width direction, and outside the 2 nd curved portion in the width direction.

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

the length of the intermediate region in the front-rear direction is longer than the thickness of the absorbent body at a portion adjacent to the 1 st curved portion in the excretory opening opposing region.