TWI649070B - Absorbent article - Google Patents

Abstract

In order to provide an absorbent article that can suppress back leakage when the user is lying down in a sleeping position.

The absorbent article (1) is provided on the rear side of the center in the front-rear direction of the flap (3) and on the front side of the rear end edge of the absorbent core: a first curved portion (41) extending in the width direction, and located at the front side a second curved portion (42) extending rearward of the first curved portion and extending in the width direction. The absorbent article has a first region (R1) adjacent to the first curved portion in front of the first curved portion, a second region (R2) adjacent to the second curved portion at the rear of the second curved portion, and The intermediate portion (R3) between the first curved portion and the second curved portion in the front-rear direction. The basis weight of the absorbing material in the intermediate portion is lower than the basis weight of the absorbing material in the first region and lower than the basis weight of the absorbing material in the second region. The length of the intermediate portion in the front-rear direction is longer than the thickness of the absorber in the portion adjacent to the first curved portion in the first region.

Description

Absorbent article

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

The absorbent article for night use is used when the user sleeps, and the time is longer than that of the absorbent article for daily use. Therefore, in the use of the night absorbent article, post leaking easily occurs. Patent Document 1 discloses a night absorbent article which can prevent back leakage.

The absorbent article of Patent Document 1 has a portion opposite to the excretion portion that faces the bodily fluid excretion portion of the user, and a portion that is disposed on the back side of the portion opposite to the excretion portion. In the absorber body at the rear portion, a plurality of high-density portions and low-density portions extending in the width direction are formed. In the absorbent article of Patent Document 1, when the body fluid flows backward, the body fluid is held by the high-density portion having a high density, and the low-density portion having a low density is softly deformed, thereby suppressing the post-leakage.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-136900

However, the above absorbent article has the following problems. The Applicant conducted various investigations on the deformation of the user's body in a sleeping state. As a result, it is known that the user in the sleeping state causes the body to deform, causing the absorbent article to become unintended.

Specifically, the user lying on the sleeping position state, the bulge of the buttocks is crushed. The flattened portion of the buttocks of the buttocks will move toward the underside of the ankle. The absorbent article opposed to the underarm region of the user is pressed by the flattened portion of the buttocks of the buttocks to be deformed away from the user's body. As a result, a gap is created between the underarm area of the user and the absorbent article, causing a back leak to occur.

The present invention has been made in view of the above problems, and an object thereof is to provide an absorbent article which can suppress back leakage when a user is lying on a sleeping position.

In order to solve the problem, the absorbent article (absorbent article 1) of the present invention has a front-back direction (front-rear direction L) and a width direction (width direction W) orthogonal to each other, and has a main body portion (main body portion 2) and In the fin piece (the fin piece 3), the main body portion (the main body portion 2) includes an absorber (absorbent body 30) having an absorbent core body (absorbent core body 31) laminated with an absorbing material, and is located at the absorption ratio The body is further a skin-facing sheet on the opposite side of the skin (the skin sheet 10), and a non-face sheet (non-surface sheet 20) located on the non-frontal side of the absorbent body; the flap ( The fin 3) extends outward in the width direction from the outer edge of the main body portion, and can be turned toward the non-surface sheet when in use. The first curved portion (the first curved portion 41) extending in the width direction is provided on the rear side of the rear end of the absorbent core in the rear side of the front side of the absorbent core. And a second curved portion (second curved portion 42) located at a rear side of the first curved portion and extending in the width direction, wherein the first curved portion and the second curved portion are configured to enable the absorbent article to be The absorbent article has a first region (first region R1) adjacent to the first curved portion in front of the first curved portion, a rear portion of the second curved portion, and the second curved portion. a second region (second region R2) adjacent to the portion, and an intermediate portion (intermediate region R3) between the first curved portion and the second curved portion in the front-rear direction; and a base of the absorbing material in the intermediate portion The weight is lower than the basis weight of the absorbing material in the first region and lower than the basis weight of the absorbing material in the second region; the length of the intermediate portion in the front-rear direction is greater than the ratio in the first region The thickness of the absorbent body in the portion adjacent to the first curved portion is longer.

Further, the absorbent article (absorbent article 1) of the present invention has a front-back direction (front-rear direction L) and a width direction (width direction W) orthogonal to each other, and has a body portion (body portion 2) and fins ( In the fin piece 3), the main body portion (main body portion 2) includes an absorber (absorbent body 30) having an absorbent core body (absorbent core body 31) formed of an absorbing material, and is located further than the absorber body a skin-facing sheet on the opposite side of the skin (the skin sheet 10), and a non-skin sheet (non-skin sheet 20) on the non-skin-facing side of the absorbent body; the flap (wing) The sheet 3) extends outward in the width direction from the outer edge of the main body portion, and can be folded toward the side of the non-skin sheet when used; it is intended to be more than the center of the front and rear direction of the flap. The side is further provided on the front side of the rear edge of the absorbent core: a first curved portion (first curved portion 41) extending in the width direction, and a first extending portion in the width direction extending behind the first curved portion In the second curved portion (second curved portion 42), the first curved portion and the second curved portion are configured to be capable of bending the absorbent article in a thickness direction, and the absorbent article is provided in front of the first curved portion a first region (first region R1) adjacent to the first curved portion, a second region (second region R2) adjacent to the second curved portion at the rear of the second curved portion, and in the front-rear direction An intermediate portion (intermediate region R3) between the first curved portion and the second curved portion; the basis weight of the absorbing material in the intermediate portion is lower than a basis weight of the absorbing material in the first region The basis weight of the aforementioned absorbing material in the second region is low, and the aforementioned intermediate region is After the longitudinal direction is not less than 10mm and less than 50mm.

1‧‧‧Absorbables

2‧‧‧ Body Department

2E‧‧‧ outer edge

3‧‧‧ wing

Center of the front and rear directions of the 3LC‧‧‧ wing

4‧‧‧ Hip pieces

10‧‧‧Face slices

11‧‧‧Surface

12‧‧‧ side flakes

20‧‧‧Non-skin sheet

30‧‧‧Acceptor

33‧‧‧High and Medium Department

41‧‧‧1st part

42‧‧‧2nd part

60‧‧‧Adhesive area

61‧‧‧1st body adhesion area

62‧‧‧2nd body adhesion area

63‧‧‧Flap adhesive area

64‧‧‧ Hip pad adhesion area

80‧‧‧Squeeze Department

81‧‧‧1st press section

82‧‧‧2nd press section

91‧‧‧Flexible components

R1‧‧‧1st area

R2‧‧‧2nd area

R3‧‧‧ intermediate area

L‧‧‧ direction

T‧‧‧ thickness direction

T1‧‧ ‧ skin opposite side

T2‧‧‧ non-skin opposite side

W‧‧‧Width direction

‧‧‧‧ angle

‧‧‧‧ angle

12E‧‧‧ inside edge

30E‧‧‧ outer edge

33F‧‧‧ front edge

33FS‧‧‧ front

33R‧‧‧ rear edge

Behind 33RS‧‧

41WC‧‧ Center

41E‧‧‧ outer edge

42E‧‧‧ outer edge

61R‧‧‧ rear edge

65‧‧‧ peeling sheet

81L‧‧‧1st before and after press section

81W‧‧‧1st wide press section

91R‧‧‧ rear edge

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

Figure 2 is a rear elevational view of the absorbent article of Figure 1.

Figure 3 is a schematic cross-sectional view of the A-A section shown in Figure 1.

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

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

(1) The overall structure of the absorbent article

The overall structure of the absorbent article 1 of the embodiment will be described with reference to Figs. 1 to 3 . In the description of the following drawings, the same or similar reference numerals are given to the same or similar parts. However, please note that the drawings are only illustrative, and the ratios of the dimensions are different from the actual ones. Therefore, the specific dimensions, etc., should be judged by the following description. In addition, the drawings also include portions having different dimensional relationships and ratios from each other.

1 is a plan view of an absorbent article, and FIG. 2 is a rear view of the absorbent article. Figure 3 is a cross-sectional view taken along line A-A of Figure 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 along the front side (ventral side) and the rear side (back side) of the user, a width direction W orthogonal to the front-rear direction L, and a skin-facing side along the user's skin. The thickness direction T of the T1 and the non-surface opposite side T2 extends.

The absorbent article 1 includes an absorbent body 30 having an absorbent core formed of an absorbent material, a skin sheet 10 located on the skin facing surface side T1 of the absorbent body 30, and a specific absorbent body 30. The non-skin sheet 20 of the non-skinned facing side T2. The skin sheet 10 has a liquid-permeable surface sheet 11 covering at least the center in the width direction of the absorber 30, and an outer side edge of the covering surface sheet 11 (outside in the width direction) The side sheet 12 extending toward the outer side in the width direction. The non-thin sheet 20 is a liquid impermeable sheet.

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

The side sheet 12 may be selected from the same material as the surface sheet 11. However, in order to prevent the menstrual blood from flowing to the outside of the absorbent article 1 through the side sheets 12, the side sheets 12 are preferably hydrophobic or water-repellent. The side sheet 12 is disposed on the outer edge of the main body portion 2, the flap 3, and the hip piece 4, which will be described later.

The non-thin sheet 20 has a length substantially the same as the length of the skin sheet 10. The non-face sheet 20 may be a polyethylene sheet, a laminated nonwoven fabric mainly composed of polypropylene or the like, a gas permeable resin film, a sheet obtained by bonding a gas permeable resin film to a nonwoven fabric such as a spunbond or a water needle, or the like.

The absorber 30 has an absorbent core 31 in which an absorbent material is laminated, and a core covering 32 covering the absorbent core 31. The absorbent material can be exemplified by hydrophilic fibers, pulp, and SAP.

The absorbent article 1 has a body portion 2, a flap 3, and a hip piece 4. The main body portion 2 is located at the center in the width direction W of the absorbent article 1 and extends in the front-rear direction L. The flap 3 and the hip piece 4 are larger than the body portion 2 The outer edge 2E extends outward in the width direction W. The outer edge 2E of the body portion 2 coincides with the outer edge 30E of the absorber 30.

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

The flap 3 has a side sheet 12 and a non-face sheet 20. The center 3LC of the front and rear directions of the flap 3 is opposed to the drain of the user. The flap 3 is configured to be foldable toward the side of the non-thin sheet 20, and is folded toward the non-perforated side of the crotch portion of the undergarment when in use. The hip piece 4 is located behind the flap 3. The hip piece 4 is configured so as not to be folded toward the non-perforated side of the underwear at the time of use, and is disposed on the skin facing side of the underpants.

The inner edge 12E of the side sheet 12 is folded outward in the width direction W along the front-rear direction L. A stretchable member 91 that expands 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 are anti-leakage cuffs that constitute an uprightness. The stretchable member 91 is disposed so as to straddle the first curved portion 41 and the second curved portion 42 which will be described later in the front-rear direction L. More specifically, the front end edge 91F of the stretchable member 91 is located further forward than the first curved portion 41, and the rear end edge 91R of the stretchable member 91 is located further rearward than the second curved portion 42.

As shown in Fig. 2, an adhesive region 60 is provided on the non-surface opposite surface of the non-face sheet 20, and an adhesive for fixing the absorbent article to the undergarment S is applied to the adhesive region 60. The adhesive region 60 has a first body adhesive region 61 and a second body adhesive region disposed in the main body portion 2 62. The fin adhesion area 63 disposed on the flap 3 and the hip sheet adhesion area 64 disposed on the hip piece 4. The first body adhesion region 61 is separated from the second body adhesion region 62 in the front-rear direction, and is disposed further forward than the second body adhesion region 62.

The adhesive region 60 is covered with the release sheet 65 in a state before use. The release sheet 65 is used to prevent deterioration of the adhesive before use. The peeling sheet 65 is peeled off by the user at the time of use. Further, the absorbent article having no release sheet may be configured to prevent deterioration of the adhesive before use by using a packaging sheet in which the absorbent article is individually packaged.

The first curved portion 41 and the second curved portion 42 are provided in the absorbent article 1. The first curved portion 41 and the second curved portion 42 are located further rearward than the center 3LC in the front-rear direction of the flap 3 and further forward than the rear edge of the absorbent core 31. The first curved portion 41 and the second curved portion 42 extend in the width direction W, and are configured to bend the absorbent article 1 in the thickness direction T. Further, in the absorbent body 30 of the present embodiment, the rear end edge of the absorbent core substantially coincides with the rear end edge of the absorbent body.

The absorbent article 1 includes a first region R1 adjacent to the first curved portion 41 in front of the first curved portion 41, and a second region R2 adjacent to the second curved portion 42 at the rear of the second curved portion 42 and The intermediate portion R3 between the first curved portion 41 and the second curved portion 42 is located in the front-rear direction L. The first region R1 is a region from the front end edge 30F of the absorber 30 to the first curved portion 41. The second region R2 is a region from the rear end edge 30R of the absorber 30 to the second curved portion 42. The intermediate portion R3 is the first curved portion 41 and the second curved portion 42 The area between.

The basis weight of the absorbing material in the intermediate portion R3 is lower than the basis weight of the absorbing material of the first region R1 and lower than the basis weight of the absorbing material of the second region R2. Further, the intermediate portion R3 may be a region having a lower basis weight of the absorbing material than the first region R1 or the like, and may be a region having a basis weight of 0, or may have a design basis weight of 0 but may be disposed from the first region. The area of the absorbing material mixed in the region R1 or the like.

The first curved portion 41 becomes a boundary where the rigidity changes. The rigidity of the region on the front side of the first curved portion 41 is different from the rigidity of the region on the rear side of the first curved portion 41. More specifically, the basis weight of the absorbing material in the region on the front side of the first curved portion 41 is higher than the basis weight of the absorbing material in the region on the rear side of the first curved portion 41. Therefore, the rigidity on the front side of the first curved portion 41 is higher than the rigidity on the rear side than the first curved portion 41.

The second curved portion 42 is located rearward of the first curved portion 41. The second curved portion 42 becomes a boundary where the rigidity changes. The rigidity of the region on the front side of the second curved portion 42 is different from the rigidity of the region on the rear side of the second curved portion 42. More specifically, the basis weight of the absorbing material in the region on the front side of the second curved portion 42 is lower than the basis weight of the absorbing material in the region on the rear side of the second curved portion 42. Therefore, the rigidity on the front side of the second curved portion 42 is lower than the rigidity on the rear side than the second curved portion 42.

The length of the intermediate portion R3 in the front-rear direction L is longer than the thickness of the absorber 30 in the portion of the first region R1 adjacent to the first curved portion 41. Further, regarding the structure in which the thickness of the absorber 30 of the first region R1 is changed, the length of the intermediate region R3 in the front-rear direction is configured as a ratio The thickness of the absorber 30 adjacent to the first curved portion 41 may be longer, and may be shorter than the thickness of other portions of the first region (for example, the central portion in the front-rear direction).

Further, the length of the intermediate portion R3 in the front and rear directions is preferably 10 mm or more and 50 mm or less. In addition, the structure in which the length in the front-rear direction of the intermediate portion R3 is changed may be 10 mm or more and 50 mm or less in the front-back direction in the center of the intermediate portion R3 in the width direction. Further, it is more preferable that the length of the intermediate portion R3 in the front and rear directions is 10 mm or more and 30 mm or less.

The distance 41 between the center 41WC in the width direction of the first curved portion 41 and the center 3LC in the front and rear directions of the flap is preferably 25 mm or more. Further, the distance 41 between the center 41WC in the width direction of the first curved portion 41 and the center in the front and rear directions of the flap is preferably 80 mm or less. In addition, the first curved portion 41 has a predetermined length in the front-rear direction, and the distance between the center of the front end edge of the first curved portion 41 in the width direction and the center of the front and rear directions of the flap may be 25 mm or more and 80 mm or less.

The first curved portion 41 and the second curved portion 42 are convexly curved toward the rear in a plan view. More specifically, the center of the first curved portion 41 in the width direction is located rearward than the outer edge of the first curved portion 41. The center of the first curved portion 41 in the width direction is convex toward the rear. The center of the second curved portion 42 in the width direction is located rearward of the outer edge of the second curved portion 42. The center of the second curved portion 42 in the width direction is convex toward the rear. Further, the distance between the first curved portion 41 and the second curved portion 42 in the front-rear direction may be fixed or may be changed.

The first curved portion 41, the second curved portion 42, and the intermediate portion R3 do not overlap the adhesive region 60 in the thickness direction T. The first body adhesion region 61 is disposed in the first region R1, and the second body adhesion region 62 is disposed in the second region R2. The rear end edge 61R of the first main body adhesion region 61 is located in front of the first curved portion 41, and the front end edge 62F of the second main body adhesive region 62 is located rearward of the second curved portion 42.

The outer edge 41E of the first curved portion 41 and the outer edge 42E of the second curved portion 42 are located on the outer edge of the absorbent core 31. In other words, the first curved portion 41 and the second curved portion 42 are formed over the entire width direction of the absorbent core. The absorption core body 31 is divided by the first curved portion 41 and the second curved portion 42 in the front-rear direction L. Further, in the absorber 30 of the present embodiment, the outer edge of the absorbent core 31 and the outer edge of the absorber 30 substantially coincide. Therefore, it is shown that the outer edge 41E of the first curved portion 41 and the outer edge 42E of the second curved portion 42 coincide with the outer edge 30E of the absorber 30.

The absorber 30 has an inner upper portion 33 located in the width direction of the outer edge 30E of the absorber 30. The middle portion 33 is located in the first region R1 and is located on the inner side of the first region R1 in the width direction of the outer edge 30E of the absorber 30. In Fig. 1, a slash is added to the middle portion 33. The thickness of the middle portion 33 is thicker than the thickness of the outer edge 30E of the absorber 30 of the first region R1. The basis weight of the absorbent material of the middle portion 33 is higher than the basis weight of the absorbent material of the outer edge 30E of the absorbent body 30 of the first region R1. The middle portion 33 is located on the rear side in the first region R1 and is adjacent to the first curved portion 41.

Further, when the absorber is a structure having two layers of the absorption layer In the case of the middle and high portions of the absorbent body, there may be two absorbent layers, and only one of the absorbent layers in the middle of the absorbent body. Further, as a modification, the upper portion of the absorbent body may have an auxiliary sheet into which the body fluid is introduced, and the auxiliary sheet is not provided in addition to the upper portion of the absorbent body.

In the cross section in the front-rear direction L of the absorbent article 1 shown in FIG. 3, the rear surface 33RS of the middle portion 33 and the non-skin direction of the middle portion 33 extend from the rear end edge 33R of the middle-high portion 33 in the thickness direction T. The angle α formed by the surface is larger than the angle β formed by the front surface 33FS of the upper portion 33 extending from the front end edge 33F of the middle-high portion 33 in the thickness direction T and the non-skin opposing surface of the middle-high portion 33. The angle α is an angle formed by the rear surface 33RS of the middle-high portion 33 and the non-skin opposing surface of the middle portion 33 extending forward from the rear end edge 33R of the middle-high portion 33. Further, the angle β is an angle formed by the front surface 33FS of the middle-high portion 33 and the non-skin opposing surface of the middle portion 33 extending rearward from the front end edge 33F of the middle-high portion 33.

The measurement of the "thickness of the absorbent body" in the present specification is carried out in accordance with the following measurement methods.

When the absorbent article 1 is sealed in a package or the like, it is used: a sample which is taken out from the package and left in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH for 12 hours. .

The measurement position is set to the center of the width direction of the absorbent body. In the measurement, the absorbent article is not shrunk, and the elastic member of the absorbent article is stretched. Further, portions other than the absorber such as the skin sheet and the non-face sheet other than the absorber are removed. A pointer type thickness gauge PEACOCK manufactured by Ozaki Seisakusho Co., Ltd. was used, and a test piece having a diameter of 10 mm was prepared, and a test piece having a size of 30 mm × 30 mm was prepared, and the thickness of the test piece was measured. The measuring instrument was adjusted to a measuring pressure of 3 g/cm ² for the test piece. Here, the above measurement was performed for each of 10 samples, and the average value was taken as the thickness.

In addition, the measurement of the "basis weight and density of the absorber" in the present specification is carried out in accordance with the following measurement methods.

When the absorbent article 1 is sealed in a package or the like, it is used: a sample which is taken out from the package and left in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH for 12 hours. .

The absorbent article packaged by the package is obtained by unpacking the package, and unfolding the folded absorbent article, and measuring the thickness and area of the portion to be measured based on the basis weight and density. Next, the portion of the basis weight and the density to be measured was cut out from the absorbent article, and the weight of the cut portion was measured. Next, portions other than the absorber such as the surface sheet and the back sheet were removed from the cut portions, and the weight of the absorber was measured. The basis weight is calculated from the weight of the absorbent body and the area of the portion to be subjected to the basis weight and density. The density is calculated based on the basis weight and thickness.

In addition, the measurement of the "length" of this specification is performed based on the following measurement methods.

When the absorbent article 1 is sealed in a package or the like, it is used: a sample which is taken out from the package and left in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH for 12 hours. .

Next, a telescopic tape measure (belt: coated glass fiber reinforced polyvinyl chloride) manufactured by Affinity Measurement Co., Ltd. was used to carry the measurement target portion along the measurement target unit. The length of this state of the measurement target portion was measured. Here, the above measurement was performed for each of 10 samples, and the average value was taken as the length.

In addition, the measurement of the "angle of the upper part of the absorber" in this specification is performed based on the following measurement methods. The absorbent article packaged in the package is obtained by unpacking the package, unfolding the folded absorbent article, taking a photograph from the side of the absorbent article, and measuring the α and β angles shown in Fig. 3 by an indexer.

(2) Wear status of absorbent articles

Next, the wearing state of the absorbent article 1 configured as described above will be described. Fig. 4 is a cross-sectional view taken along the line A-A of Fig. 1 in a state in which the absorbent article 1 is worn by a user.

Fig. 4 (a) shows a state in which the user wearing the absorbent article 1 stands.

The first region R1 of the absorbent article 1 is fixed to the crotch portion of the undergarment (portion facing the crotch region of the user) through the first main body adhesive region 61. The second region R2 of the absorbent article 1 is fixed to the rear portion of the crotch portion of the undergarment (the portion facing the buttocks of the user) through the second main body adhesive region 62. When the user is standing, the user's buttocks are in a raised state.

Fig. 4 (b) is a state in which the sectional view shown in Fig. 4 (a) is rotated by 90 degrees, and shows the state of the sleeping position in which the user lies. When the user is lying on his back, the user's body will be pressed by the bedding, but in Figure 4(b) For convenience of explanation, it is a state in which the user's body is not pressed by the bedding. Fig. 4(b) is a diagram showing a line LB indicating a bedding. The area where the line LB of the bedding overlaps with the body is an area where the body is pressed by the bedding to deform the body in a sleeping state.

Fig. 4 (c) shows a state in which the body of the user lying in a sleeping position is pressed by the bedding to be deformed. In the state shown in Fig. 4(c), the area where the lines of the body and the bedding overlap in Fig. 4(b) are deformed. More specifically, the ridge of the user's buttocks is flattened, and a part of the user's buttocks has a flat shape. The flattened part of the buttocks moves toward the underside of the ankle and bulges from the underarm to the toe side. The second curved portion 42 is disposed at the end portion on the buttock side of the flattened portion of the buttocks, and the first curved portion 41 is disposed at the lower end portion of the flattened portion of the buttocks. Therefore, the intermediate portion R3 of the absorbent article is deformed along the flattened portion of the buttocks and is disposed along the flattened portion of the buttocks.

(3) Effect

The center 3LC of the front and rear direction of the flap is located at a position opposite to the drain opening of the user. The first curved portion 41 and the second curved portion 42 are provided behind the flap 3 . The deformation starting point of the first curved portion 41 and the deformation starting point of the second curved portion 42 are formed at a position in contact with the buttocks rearward of the user's excretory opening. Therefore, when the bulge of the buttocks is flattened, the absorbent article 1 is softly deformed along the deformation of the buttocks.

Further, an intermediate portion R3 having a low basis weight of the absorbing material is provided between the first curved portion 41 and the second curved portion 42. Due to the intermediate area R3 The absorbing material has a low basis weight and is easily deformed softly. When the flat portion of the buttocks moves toward the underarm side, the intermediate portion R3 absorbs the deformation of the buttocks, allowing the user to easily contact the first region R1 and the second region R2. Further, by dividing the first region R1 and the second region R2 by the intermediate region R3, it is possible to suppress the transmission of power from the first region R1 to the second region R2.

Further, the length of the intermediate portion R3 in the front-rear direction L is longer than the thickness of the absorber 30 in the portion of the first region R1 adjacent to the first curved portion 41. The deformation of the buttocks is absorbed by the intermediate portion R3, and a step difference in which the buttocks are deformed and absorbed is formed behind the first region R1. In this manner, the front side of the intermediate portion R3 can be disposed to face the excretory opening of the user, and the rear side of the intermediate portion R3 can be disposed to face the buttocks of the user. Thereby, the gap between the absorbent article and the body can be reduced to suppress the back leak.

Further, the length of the intermediate region R3 in the front and rear direction L is 10 mm or more. For example, when the length of the front region in the front and rear directions is less than 10 mm, the portion where the buttocks are flattened may not be sufficiently absorbed. On the other hand, by making the length of the intermediate portion R3 in the front-rear direction 10 mm or more, the deformation of the buttocks can be effectively absorbed.

The length of the intermediate region R3 in the front and rear directions L is 50 mm or less. By making the length of the intermediate region R3 in the front-rear direction L 50 mm or less, the deformation of the body can be absorbed by the intermediate region R3, and the body fluid flowing to the buttocks can be absorbed by the second region R2. In this way, menstrual blood flow to the buttocks side can be suppressed. On the other hand, when the length of the front region L3 in the front and rear directions L is longer than 50 mm, the user feels uneasy because the menstrual blood flows to the buttocks side. It is difficult to get a sense of security when wearing.

The length of the intermediate region R3 in the front and rear directions L is 10 mm or more and 50 mm or less. The intermediate portion R3 can absorb the deformation of the body by making the length of the intermediate portion R3 which is more easily deformed in the front-rear direction 10 mm or more and 50 mm or less. The deformation of the buttocks is absorbed by the intermediate portion R3, so that the user can easily contact the first region R1 and the second region R2 continuously. Further, by dividing the first region R1 and the second region R2 by the intermediate region R3, it is possible to suppress the transmission of power from the first region R1 to the second region R2. In this manner, the front side of the intermediate portion R3 can be disposed to face the excretory opening of the user, and the rear side of the intermediate portion R3 can be disposed to face the buttocks of the user. In this way, the gap between the absorbent article and the body can be reduced to suppress the rear leak.

The distance L1 between the center 41WC of the width direction W of the first curved portion 41 and the center 3LC of the front and rear direction L of the flap 3 is 25 mm or more and 80 mm or less. As a result of various investigations, the applicant has found that the starting point of the deformation of the lower side of the buttocks is mostly 25 mm or more rearward than the center of the front and rear directions L of the flaps 3. Therefore, when the distance 41 between the center 41WC of the width direction W of the first curved portion 41 and the center 3LC of the front and rear direction L of the flap 3 is 25 mm or more, the first curved portion 41 and the intermediate portion R3 are located on the lower side of the buttocks. The starting point of the deformation. Further, when the distance 41 between the center 41WC of the width direction W of the first curved portion 41 and the center 3LC of the front and rear direction L of the flap 3 exceeds 80 mm, the first curved portion 41 and the intermediate portion are located at the most uplift of the buttocks and the body pressure of the buttocks. The biggest part, and may cause discomfort.

The first curved portion 41 and the second curved portion 42 are oriented rearward. The square is convexly curved. The portion that is convexly curved toward the rear is bulged convexly toward the rear with the panties, and is extruded toward the body. By moving the first curved portion 41, the second curved portion 42, and the intermediate portion R3 away from the body, the deformation of the reclining can be absorbed by the first curved portion 41, the second curved portion 42, and the intermediate portion R3. In this manner, the first region R1 and the second region R2 are maintained in a shape following the body curve, and the entire absorbent article is arranged along the curve of the body.

The adhesive region 60 does not overlap the first curved portion 41, the second curved portion 42, and the intermediate portion R3 in the thickness direction T. The portion of the absorbent article 1 that is fixed to the undergarment (the portion where the adhesive region is provided) is easily deformed following the underpants. For example, when the first curved portion 41, the second curved portion 42, and the intermediate portion R3 are fixed to the undergarment through the adhesive region, if the body is deformed while lying in a sleeping position, the absorbent article is deformed following the underpants. When the absorbent article is subjected to unintended deformation following the undergarment, a gap may occur between the user and the absorbent article. However, since the first curved portion 41, the second curved portion 42, and the intermediate portion R3 are not fixed to the undergarment, they can be freely deformed. In this manner, even when the first region R1 and the second region R2 are deformed together with the underpants, the force transmitted from the underpants is cut by the intermediate portion R3, and the deformation of the user's body can be absorbed by the intermediate portion R3.

The middle portion 33 is adjacent to the first curved portion 41 in the first region R1. The thickness of the middle portion 33 is thicker than the thickness of the region other than the upper portion of the absorber 30. By making the upper portion 33 and the first curved portion 41 in the first region R1 abut, the difference in rigidity and the difference in thickness between the first region R1 and the intermediate portion R3 are increased, and a clear starting point of deformation can be formed. So, the middle zone can be R3 and the first region R1 are arranged along the body in different shapes.

The angle α formed by the rear surface 33RS of the mid-high portion 33 and the non-skin contrast 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 opposing surface of the middle-high portion 33. When the angle formed by the side surface of the absorber and the non-surface opposite surface of the absorber is large, the absorber is easier than when the angle between the side surface of the absorber and the non-surface opposite surface of the absorber is small. Bend with the non-pivot facing surface as the starting point. For example, when the angle of the front surface of the middle portion 33 is large, the starting point of the bending may be formed on the front surface of the middle portion 33, and the adhesion of the front surface of the middle portion 33 may be lowered. However, since the angle formed by the front surface of the middle-high portion 33 and the non-percutaneous facing surface is small, the front surface of the middle-high portion 33 is not easily bent, and the front surface of the middle-high portion 33 can be maintained. On the other hand, since the angle formed by the rear surface of the middle-high portion 33 and the non-percutaneous facing surface is large, the bending starting point is easily formed on the surface after the middle-high portion 33.

The stretchable member 91 is disposed to straddle the first curved portion 41 and the second curved portion 42 in the front-rear direction L. By the contraction of the stretchable member 91, the first region R1 on the front side of the first curved portion 41 and the second region R2 on the rear side of the second curved portion 42 can be brought closer to each other. As described above, even when the wrinkles are generated in the intermediate portion R3 by the deformation of the first curved portion 41 or the like, the wrinkles can be concentrated.

The outer edge 41E of the first curved portion 41 and the outer edge 42E of the second curved portion 42 are located on the outer edge of the absorbent core 31. In this manner, the entire region in the width direction of the absorbent core 31 is easily deformed by using the first curved portion 41 and the second curved portion 42 as a starting point. In addition, because the first area R1 and the second area The domain R2 is divided in the front-rear direction L, and it is possible to suppress one of the deformed states from propagating to the other.

(4) The absorbent article of the modification

Next, the absorbent article 1A of the modification will be described. In the description of the absorbent article 1A according to the modification, the structure different from the above-described embodiment will be described, and the same components as those of the above-described embodiment will be denoted by the same reference numerals and will not be described.

The absorbent article 1A according to the modification has a press portion 80 in which at least the absorbent body 30 is compressed in the thickness direction. The press portion 80 of the present embodiment is configured such that the surface sheet 11 and the absorber 30 are compressed in the thickness direction. The press portion 80 includes a first press portion 81 disposed in the first region R1 and a second press portion 82 disposed in the second region R2.

The first press portion 81 includes a first front and rear press portion 81L that extends in the front-rear direction, and a first wide press portion 81W that is located in front of the first front and rear press portion 81L and extends in the width direction. The first front and rear press portions 81L are located on the outer side in the width direction from the center in the width direction of the first region R1.

Further, the first front and rear press portions 81L are inclined with respect to a straight line in the front-rear direction L, and the angle formed by the straight line in the front-rear direction L and the first front-rear press portion 81L (the acute angle side) is 45 degrees or less. On the other hand, the first wide press portion 81W is inclined with respect to a straight line in the width direction W, and the angle formed by the straight line in the width direction W and the first wide press portion 81W (the acute angle side) is less than 45. degree.

The middle portion 33 is surrounded by the first wide press portion 81W, the pair of first front and rear press portions 81L, and the first curved portion 41. The pair of first front and rear press portions 81L are disposed along the outer edge of the middle portion 33. Since the press portion 80 surrounds the middle portion 33, the bulging of the middle portion 33 is easily maintained, and the middle portion 33 can be more closely fitted to the user's drain.

The first curved portion 41 and the second curved portion 42 are formed in a linear shape in the width direction. In addition, the outer edge 41E of the first curved portion 41 and the outer edge 42E of the second curved portion 42 are located outside the first front and rear press portion 81L in the width direction. Further, as in the modification shown in FIG. 5, in the structure in which the position of the first front and rear press portion 81L is changed in the width direction, at least the rear end edge of the first front and rear press portion 81L (closest to the first curved portion 41 and The portion of the second curved portion 42 may be located outside the first and lower press portions 81L in the width direction.

In order to maintain the structure in contact with the body, it is preferable to have a structure in which the first region R1 that is further forward than the first curved portion 41 and the second region R2 that is later than the second curved portion 42 are surely divided. In the state in which the absorbent article 1 is worn, the first region R1 and the first curved portion 41 are pinched by the user's foot, and the width is reduced to be raised toward the skin facing surface side. This fits the body. On the other hand, the second curved portion 42 and the second region R2 maintain a flat shape, and have both a good fit and a wear feeling. Therefore, when the width of the outer side edge of the first curved portion 41 is narrower than that of the first front and rear press portions, wrinkles are generated in the vicinity of the deformation starting point (mainly the first curved portion 41) in conjunction with the movement of the front side such as the first region. It is difficult to obtain the segmentation effect of the first region and the second region. However, since the outer edge 41E of the first curved portion 41 and the second curved portion 42 are outside The side edge 42E is located on the outer side in the width direction of the press portion 80, and the first curved portion 41 and the second curved portion 42 are used as the deformation starting point in the region from the middle-high portion 33 to the outer side in the width direction from the press portion 80. In this way, the entire region in the width direction of the middle and high portions can be easily deformed, and the division effect of the first region and the second region can be obtained.

Further, the absorbent core 31 is disposed on the outer side in the width direction of the first curved portion 41, the outer side in the width direction of the intermediate portion R3, and the outer side in the width direction of the second curved portion 42. As described above, the absorbent core of the modified example is not divided in the front-rear direction by the first curved portion 41 and the second curved portion 42. For example, when the absorption core is divided in the front-rear direction by the first curved portion 41 and the second curved portion 42, the first curved portion 41 and the second curved portion 42 may be used as a starting point in the state before wearing. The deformation causes unintended wrinkles.

However, since the absorption core is not divided in the front-rear direction by the first curved portion 41 and the second curved portion 42, the first curved portion 41 and the second curved portion 42 can be suppressed in the state before being worn. Deformation from the starting point can suppress the occurrence of unintended wrinkles.

(5) Other embodiments

The absorbent article of the present embodiment is a sanitary napkin for night use, and is another embodiment. It can also be a sanitary napkin for daily use. In addition, the sanitary napkin may not have a hip piece.

The present invention has been described above in detail using the above embodiments, but it will be common to those skilled in the art. The invention is of course not limited to the embodiments described in the present specification. The present invention can be implemented in a modified and modified form without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the description of the present specification is intended to be illustrative only and not to limit the invention.

(6) Comparative evaluation

Next, a comparison evaluation of the length of the intermediate portion will be described. Table 1 shows the results of comparative evaluation of the length of the intermediate portion. 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 feeling of adhesion and the feeling of uneasiness of absorbability were evaluated. The absorbent articles of Examples 1 to 4 and the absorbent articles of Comparative Examples 1 to 3 had the same structure except that the length in the front and rear directions of the intermediate portion R3 was different.

The comparative evaluation of the test was made by women using sanitary napkins 20 Name implementation. In the evaluation test, the implementer observes and uses the sample to be used, and makes the following inquiry.

Ask 1 "Is it possible to maintain fit compared to the usual sanitary napkin?" In the inquiry 1, the sample in which the ratio of the number of people who answered "sustainable" was 65% or more was considered to be good for the sensory evaluation, and the evaluation was ○. In addition, the sample in which the ratio of the number of people who answered "sustainable" to the inquiry 1 was less than 65% was considered to be poorly evaluated, and the evaluation was ×.

Question 2 "Whether it seems that the feeling of uneasiness for absorption is reduced (or whether there is no feeling of uneasiness) compared to the usual sanitary napkin." In the case of the inquiry 2, the sample having a ratio of "the feeling of restlessness is reduced" or "there is no uneasiness" is 65% or more, and the evaluation of the sensory is considered to be good, and the evaluation is ○. In addition, in the case of the inquiry 2, the sample in which the number of people who had "reduced uneasiness" or "no uneasiness" was less than 65% was considered to be poorly evaluated, and the evaluation was ×.

In the absorbent articles of Examples 1 to 4, the length of the intermediate portion in the front-rear direction was 10 to 50 mm, and the evaluation of the adhesion retention and the evaluation of the feeling of discomfort of absorbability were all good. From this result, it is understood that the length of the intermediate portion in the front-rear direction is preferably 10 mm or more and 50 mm or less. More specifically, by making the length of the intermediate portion in the front-rear direction 10 mm or more, good results can be obtained for the fit. Further, by making the length of the intermediate portion 50 mm or less, it is possible to suppress the feeling of uneasiness with respect to absorbability.

Next, it was measured that the flattened portion of the buttocks of the user lying on the back posture was toward the underside of the underarm. The amount of extrusion is the state of lying on the back. The distance between the lower end portion of the user's buttocks (P1 of Fig. 4(c)) and the end of the buttocks of the buttocks (P2 of Fig. 4(c)). The amount of extrusion of the five testers was measured. The measurement results are shown in Table 2.

According to the measurement results, the amount of extrusion of the buttocks was 10 mm to 30 mm. Therefore, it can be seen that the length of the intermediate portion in the front-rear direction is 10 mm or more, so that the bulging from the lower end portion of the flattened portion of the user's buttocks to the extruded foot-side end portion of the buttocks can be covered.

In addition, the entire content of Japanese Patent Application No. 2014-203190, filed on Jan. 1, 2014, is hereby incorporated by reference.

[Industry Utilization]

According to the present invention, it is possible to provide an absorbent article capable of suppressing back leakage while the user is lying down in a sleeping position.

Claims (12)

An absorbent article having a body portion and a width direction orthogonal to each other, and having a body portion and a fin, the body portion having an absorbent body having an absorbent core layer formed of an absorbing material, located at a ratio The absorbent body further has a skin-facing sheet on the opposite side of the skin and a non-surface sheet on the side opposite to the skin of the absorbent body; the flap is wider than the outer edge of the body portion. The outer side of the outer sheet is folded toward the side of the non-thin sheet, and is disposed on the rear side of the front and rear of the flap in the front-rear direction and on the front side of the rear end of the absorbent core: extending in the width direction a first curved portion and a second curved portion extending rearward of the first curved portion and extending in the width direction, wherein the first curved portion and the second curved portion are defined by boundaries of rigidity change, and are configured In order to bend the absorbent article in the thickness direction, the absorbent article has a first region adjacent to the first curved portion in front of the first curved portion, a rear portion of the second curved portion, and the first portion. 2 curved parts adjacent to the first a region 2 and an intermediate portion between the first curved portion and the second curved portion in the front-rear direction, wherein a basis weight of the absorbing material in the intermediate portion is a basis weight of the absorbing material in the first region It is lower than the basis weight of the absorbing material in the second region, and the length of the intermediate portion in the front-rear direction is larger than the thickness of the absorber in a portion of the first region adjacent to the first curved portion. Further, the outer edge of the first curved portion and the outer edge of the second curved portion are located on the outer edge of the absorbent core. The absorbent article according to claim 1, wherein the intermediate portion has a length in the front-rear direction of 10 mm or more. The absorbent article according to claim 2, wherein the intermediate portion has a length in the front-rear direction of 50 mm or less. The absorbent article according to any one of claims 1 to 3, wherein a distance between a center of the first curved portion in the width direction and a center of the front and rear direction of the flap is 25 mm or more and 80 mm or less . The absorbent article according to any one of claims 1 to 3, wherein the first curved portion and the second curved portion are convexly curved toward the rear in a plan view. The absorbent article according to any one of claims 1 to 3, wherein the non-surface sheet of the body portion is provided with an adhesive region, and the adhesive region has a fixing member for fixing the absorbent article The adhesive for the underpants; the first curved portion, the second curved portion, and the intermediate portion do not overlap the adhesive region in the thickness direction. Absorption as described in any one of claims 1 to 3 In the absorbent article, the absorbent body has an inner upper portion that is located in the width direction of the outer edge of the absorbent body, and a thickness of the middle and high portions is a thickness larger than an outer edge of the absorbent body of the first region. Further, the middle and high portions are adjacent to the first curved portion in the first region. The absorbent article according to claim 7, wherein in the cross section of the absorbent article in the front-rear direction, the rear end of the middle-high portion extends in the thickness direction, and the rear side of the upper portion and the aforementioned The angle formed by the non-skin opposing surface of the middle-high portion is larger than the front surface of the middle-high portion extending from the front end edge of the middle-high portion in the thickness direction and the non-surface opposite surface of the middle-high portion . The absorbent article according to claim 7, further comprising a press portion obtained by compressing the absorbent body in a thickness direction, wherein the press portion is disposed along an outer edge of the middle-high portion. The absorbent article according to claim 9, wherein the outer edge of the first curved portion and the outer edge of the second curved portion are located outside the press portion in the width direction. The absorbent article according to any one of claims 1 to 3, wherein A stretchable member that is expandable and contractible in the front-rear direction is provided, and the stretchable member is disposed to straddle the first curved portion and the second curved portion in the front-rear direction. An absorbent article having a front-rear direction and a width direction orthogonal to each other, and having a main body portion and a fin, the main body portion having an absorbent body having an absorbent core formed of an absorbing material, located at a ratio The absorbent body further has a skin-facing sheet on the opposite side of the skin and a non-surface sheet on the side opposite to the skin opposite to the absorbent body; the flap is wider than the outer edge of the body portion The outer side of the outer sheet is folded toward the side of the non-thin sheet, and is disposed on the rear side of the front and rear of the flap in the front-rear direction and on the front side of the rear end of the absorbent core: extending in the width direction a first curved portion and a second curved portion extending rearward of the first curved portion and extending in the width direction, wherein the first curved portion and the second curved portion are defined by boundaries of rigidity change, and are configured The absorbent article is characterized in that the absorbent article has a first region adjacent to the first curved portion in front of the first curved portion, a rear portion of the second curved portion, and the first portion. 2 curved parts adjacent to the first a region 2 and an intermediate portion between the first curved portion and the second curved portion in the front-rear direction; a basis weight of the absorbing material in the intermediate portion is a basis weight of the absorbing material in the first region Low and lower than the basis weight of the aforementioned absorbent material of the second region, The length of the intermediate portion in the front-rear direction is 10 mm or more and 50 mm or less, and the outer edge of the first curved portion and the outer edge of the second curved portion are located on the outer edge of the absorbent core.