JP2007195665A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article having superior leakage prevention property in the width direction by grooves provided in a skin abutment side of an absorbent layer and having high stability of the surface shape of the absorbent layer when being worn. <P>SOLUTION: This absorbent article 1 has an absorbent layer 10 and a leakage prevention layer; the skin abutment face side in the absorbent layer 10 is provided with a left groove 51, a right groove 52, a front groove 53 and a rear groove 54 in a width-directional left side, a width-directional right side, a longitudinal front side and a longitudinal rear side respectively in the plan view; the left groove 51 and the right groove 52 are projectingly curved in the width directional outward respectively; the front groove 53 and the rear groove 54 are projectingly curved in the longitudinally outward respectively; the left groove 51 and the front groove 53, the left groove 51 and the rear groove 54, the right groove 52 and the front groove 53, and the right groove 52 and the rear groove 54 are separated from each other respectively; the front end portion 51A of the left groove 51 and the front end portion 52A of the right groove 52 are positioned in longitudinally front sides of the rear end portions 53A and 53B of the front groove 53; and the rear end portion 51B of the left groove 51 and the rear end portion 52B of the right groove 52 are positioned in longitudinally rear sides of the front end portions 54B and 54B of the rear groove 54. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to absorbent articles such as sanitary napkins and incontinence pads.

Conventionally, in absorbent articles, curved embossed grooves spaced apart on the left side, right side, front side, and rear side of the skin contact surface side of the absorbent layer made of a liquid-permeable surface sheet and a liquid-retaining absorbent body, respectively. There is something that provided.
For example, in the absorbent article described in Patent Document 1 below, the left and right sides of the absorbent layer on the skin contact surface side are provided with embossed grooves that are curved outwardly in the width direction or convex inward in the width direction, respectively. Embossed grooves that are convexly curved outward in the longitudinal direction are provided on the sides.

Japanese Patent Laid-Open No. 10-225480

  However, in the absorbent article described in Patent Document 1, there is a large separation between the left-side groove and the front-side groove and the rear-side groove, and between the right-side groove and the front-side groove and the rear-side groove. Therefore, leakage easily occurs in the width direction. Moreover, as a result of having such a separated shape, the surface shape of the absorbent layer is unstable at the time of wearing. For example, on the skin contact surface side of the absorbent layer, an excessive shape change cannot be suppressed by the front groove or the rear groove in some cases, so that the absorbent article is folded between the left groove and the right groove. It is easy to bulge toward the wearer, dents away from the wearer, or waves.

  Accordingly, an object of the present invention is to provide an absorbent article that is excellent in the leak-proof property in the width direction due to the groove provided on the skin contact surface side of the absorbent layer and that has a high stability of the surface shape of the absorbent layer when worn. There is to do.

  The present invention is an absorbent article provided with an absorbent layer and a leak-proof layer, and the skin contact surface side of the absorbent layer has a width direction left side, a width direction right side, a longitudinal direction front side, and a longitudinal direction in plan view. A left groove, a right groove, a front groove, and a rear groove are provided on the rear side, respectively, and the left groove and the right groove are each convexly curved outward in the width direction, and the front groove and the rear groove are Each of the left groove and the front groove, the left groove and the rear groove, the right groove and the front groove, and the right groove and the rear groove are separated from each other. And the front end of the left groove and the front end of the right groove are located on the front side in the longitudinal direction of the rear end of the front groove, and the rear end of the left groove and the rear end of the right groove The part achieves the above-mentioned object by providing an absorbent article located on the rear side in the longitudinal direction from the front end of the rear groove.

  According to the absorbent article of the present invention, the leakage preventing property in the width direction due to the grooves provided on the skin contact surface side of the absorbent layer is excellent, and the stability of the surface shape of the absorbent layer at the time of wearing is high. Moreover, the shape according to a wearer's crotch part shape is easy to be obtained.

Hereinafter, a preferred embodiment (first embodiment) of the absorbent article of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the absorbent article according to the first embodiment is substantially vertically long and includes a liquid-retaining absorbent layer 10 and a liquid-impermeable or liquid-permeable leak-proof layer 11. This is a sanitary napkin 1. The absorbent layer 10 includes a liquid-permeable top sheet 2 and a liquid-retaining absorbent body 4. The leak-proof layer 11 is composed of a back sheet 3 that is liquid-impermeable or liquid-impermeable.

On the skin contact surface side of the absorbent layer 10, there are a left groove 51, a right groove 52, a front groove 53, and a rear groove 54 on the left side in the width direction, the right side in the width direction, the front side in the longitudinal direction, and the rear side in the longitudinal direction, respectively, in plan view. Is provided.
The “plan view” means that the absorbent article is viewed from the skin contact surface side in a stretched state. The terms “longitudinal direction” and “width direction” mean “the longitudinal direction of the absorbent article” and “the width direction of the absorbent article”, respectively, unless otherwise specified. The “front side” refers to a side located on the front side of the wearer at the time of wearing.

The sanitary napkin 1 is divided into a front part A in the longitudinal direction, an excretory part facing part B (a part having an excretion part facing region disposed opposite to the excretion part of the wearer in the center in the width direction), and a rear part C. .
Most of the left groove 51 and the right groove 52 are located in the excretory part facing part B. Most of the front groove 53 is located in the front portion A. Most of the rear groove 54 is located in the rear portion C.

  The groove 5 (in the description common to the left groove 51, the right groove 52, the front groove 53, and the rear groove 54, the expression “groove 5” is used) is provided on the skin contact surface side of the absorbent layer 10. For example, it is formed by performing sealing processing such as heat sealing processing and ultrasonic sealing processing. The groove 5 in the present embodiment is an embossed groove formed by heat sealing.

Each of the left groove 51 and the right groove 52 is convexly curved outward in the width direction and has a substantially elliptical arc shape having one apex. The shapes of the left groove 51 and the right groove 52 are substantially line symmetric with respect to the center line extending in the longitudinal direction and the center line extending in the width direction of the absorption layer 10.
The length (shortest distance) L1 along the longitudinal direction of the inner peripheral edge of the left groove 51 (see FIG. 2A) and the length along the longitudinal direction of the inner peripheral edge of the right groove 52 (not shown) are sanitary for shorts. It is preferably 30 to 110 mm, more preferably 60 to 80 mm, from the viewpoint of allowing a difference in the position where the napkin is attached and a difference in the excretion position depending on the individual body shape and absorbing the excreted liquid.

  The widthwise maximum interval W1 between the inner peripheral edge of the left groove 51 and the inner peripheral edge of the right groove 52 (see FIG. 2B) is raised so as to fit the wearer's crotch, and the left groove 51 and the right groove From the viewpoint of stabilizing the surface shape of the region surrounded by 52, it is preferably 20 to 60 mm, and more preferably 40 to 50 mm.

  A widthwise interval W2 between the inner peripheral edge of the front end portion 51A of the left groove 51 and the inner peripheral edge of the front end portion 52A of the right groove 52 (see FIG. 2 (b)) is the absorption of the absorbed liquid between the left groove 51 and the right groove 52. It is preferably 10 to 40 mm, more preferably 15 to 30 mm, from the viewpoint of effectively using the absorber 4 and controlling the diffusion of the liquid. This preferable range of the interval W2 is also applied to the interval in the width direction (not shown) between the inner peripheral edge of the rear end portion 51B of the left groove 51 and the inner peripheral edge of the rear end portion 52B of the right groove 52.

  Each of the front groove 53 and the rear groove 54 is convexly curved outward in the longitudinal direction, and has a substantially arc shape having three vertices. The shapes of the front groove 53 and the rear groove 54 are substantially line symmetric with respect to the center line extending in the longitudinal direction and the center line extending in the width direction of the absorption layer 10.

The length L2 along the longitudinal direction of the inner peripheral edge of the front groove 53 (see FIG. 2A) and the length along the longitudinal direction of the inner peripheral edge of the rear groove 54 (not shown) control the diffusion of the liquid in the longitudinal direction. From the viewpoint of stabilizing the surface shape in the region surrounded by the left groove 51 and the right groove 52 in the sanitary napkin, it is preferably 10 to 60 mm, and more preferably 20 to 40 mm.
The widthwise maximum interval W3 (see FIG. 2B) of the inner periphery of the front groove 53 is preferably 20 to 70 mm, more preferably 30 to 50 mm from the viewpoint of effectively using the absorber 4 and preventing leakage. is there. This preferable range of the interval W3 is also applied to the widthwise maximum interval W3 of the inner peripheral edge of the rear groove 54 (see FIG. 2B).

  The width direction interval (not shown) between the inner peripheral edge of the left rear end portion 53A and the inner peripheral edge of the right rear end portion 53B in the front groove 53 is the prevention of leakage and the ease of forming the width direction fold line, that is, individual packaging shape. From the viewpoint of stability (workability and aesthetic appearance of the shape), it is preferably 15 to 60 mm, more preferably 20 to 40 mm. This preferred range of the widthwise interval is also applied to the widthwise interval W4 (see FIG. 2B) between the inner peripheral edge of the left front end portion 54A and the inner peripheral edge of the right front end portion 54B in the rear groove 54. Note that the folding line in the individual form is formed by the left groove 51 and the right groove 52 being convexly curved outward in the width direction, so that the left groove 51 and the right groove 52 are surrounded when the sanitary napkin is attached. When the area to be worn rises toward the wearer's body, it is almost lost.

  The left groove 51 and the front groove 53, the left groove 51 and the rear groove 54, the right groove 52 and the front groove 53, and the right groove 52 and the rear groove 54 are separated from each other. “Separated” means that they are not connected in a plan view.

The front end portion 51A of the left groove 51 and the front end portion 52A of the right groove 52 are located on the front side in the longitudinal direction from the rear end portions 53A and 53B of the front groove 53. More specifically, the front end portion 51A of the left groove 51 and the front end portion 52A of the right groove 52 are frontward and inner side in the width direction with respect to the left rear end portion 53A of the front groove 53 and the right rear end portion 53B of the front groove 53, respectively. Is located.
The rear end portion 51B of the left groove 51 and the rear end portion 52B of the right groove 52 are located on the rear side in the longitudinal direction from the front end portions 54A and 54B of the rear groove 54. More specifically, the rear end portion 51B of the left groove 51 and the rear end portion 52B of the right groove 52 are respectively rearward and widthwise with respect to the left front end portion 54A of the rear groove 54 and the right front end portion 54B of the rear groove 54. Located inside.

  The length (length along the longitudinal direction) L3 (see FIG. 2B) that overlaps in the width direction between the outer peripheral edge of the front end portion 51A of the left groove 51 and the outer peripheral edge of the left rear end portion 53A of the front groove 53 is From the viewpoint of prevention of leakage and ease of formation of the widthwise fold line, the thickness is preferably 1 to 10 mm, more preferably 3 to 7 mm. A preferable range of the length L3 is a length (not shown) that overlaps the outer peripheral edge of the front end 52A of the right groove 52 and the outer peripheral edge of the right rear end 53B of the front groove 53, and the rear of the left groove 51. A length (not shown) that overlaps the outer peripheral edge of the end 51B and the outer peripheral edge of the left front end 54A of the rear groove 54 (not shown), the outer peripheral edge of the rear end 52B of the right groove 52, and the right front end of the rear groove 54 This also applies to the length (not shown) that overlaps the outer peripheral edge of 54B in the width direction.

  An interval (shortest distance) L4 between the outer peripheral edge of the right groove 52 and the right rear end portion 53B of the front groove 53 (see FIG. 2B) is preferably 1 to 10 mm, and more preferably 3 to 6 mm. A preferable range of the distance L4 is a distance between the outer peripheral edge of the left groove 51 and the left rear end 53A of the front groove 53 (not shown), and a distance between the outer peripheral edge of the left groove 51 and the left front end 54A of the rear groove 54. (Not shown), and also applies to the distance (not shown) between the outer peripheral edge of the right groove 52 and the right front end 54B of the rear groove 54.

The widths of the front ends of the left rear end portion 53A and the right rear end portion 53B of the front groove 53 and the left front end portion 54A and the right front end portion 54B of the rear groove 54 are preferably 0.01 to 5 mm. The front end portions 51A and the rear end portions 51B of the left groove 51 and the front end portions 52A and the rear end portions 52B of the right groove 52 preferably have a width of 0.01 to 5 mm.
Further, the width of the front end of each of the left rear end portion 53A and the right rear end portion 53B of the front groove 53 and the left front end portion 54A and the right front end portion 54B of the rear groove 54 is equal to the front end portion 51A and the rear end portion 51B of the left groove 51. In addition, it is preferable that the width of the front end portion 52A and the rear end portion 52B of the right groove 52 is wider than the front end width. The front end 51A and the rear end 51B of the left groove 51 and the front end 52A and the rear end 52B of the right groove 52 are preferably tapered.

  As a material for forming the top sheet 2 and the back sheet 3, various sheet materials used in conventional absorbent articles and the like can be used without particular limitation.

  As the pulp material of the absorbent body 4, various pulp materials used in conventional absorbent articles and the like can be used, and long fibers such as softwood pulp, chemically treated synthetic pulp, and cellulose tow are particularly preferable. . Further, as a material for forming the absorbent body 4, in addition to a pulp material, a polymer-absorbing polymer, a synthetic fiber made of polyester or polypropylene, a heat-fusible fiber, or rayon can also be used. As a material for forming the absorbent body 4, it is also preferable to use a mixture of pulp material and other materials.

The thickness of the absorber 4 is preferably 3 to 30 mm, more preferably 5 to 15 mm, in a region sandwiched between the left groove 51 and the right groove 52 in a plan view. It is preferable that the thickness of the absorbent body 4 is in such a range because the region surrounded by the left groove 51 and the right groove 52 can be easily raised to the wearer's body when worn.
The basis weight of the absorbent core 4, from the viewpoint of ensuring flexibility of the absorbent body 4, preferably 200 to 800 g / m ^2, more preferably a 300 to 600 g / m ^2.

  In the absorbent layer 10, as shown in FIG. 3, the topsheet 2 and the absorbent body 4 are joined by grooves 5 (left groove 51, right groove 52, front groove 53, rear groove 54). The groove 5 is formed to extend deeply in the thickness direction to the vicinity of the non-skin contact surface side of the absorber 4. Therefore, even if a large amount of body fluid is excreted, the body fluid can be stopped once in the groove 5 and can move to the absorber 4 through the groove 5.

As shown in FIG. 3, the skin contact surface side and the non-skin contact surface side of both sides of the absorbent body 4 are covered with a pair of water-repellent inner sheets 7 folded at both side edges of the absorbent body 4. Yes. Further, both side portions of the top sheet 2 are folded back to the non-skin contact surface side of the absorbent body 4 to cover the inner sheet 7.
For the inner sheet 7, various water-repellent sheet materials used in conventional absorbent articles and the like can be used, and polyethylene sheets, polyethylene laminated paper, and SMS nonwoven fabrics are particularly preferable.

  The region sandwiched in the width direction between the left groove 51 and the right groove 52 in plan view in the absorbent body 4 is not raised before mounting, but the sanitary napkin 1 is compressed from the width direction during mounting. If it receives, it will become a raised part which protrudes toward a wearer's skin direction. Such a raised portion abuts on the excretion portion of the wearer when worn. From the viewpoint of improving the permeability of the excreted bodily fluid, a plurality of holes may be provided in a region sandwiched in the width direction between the left groove 51 and the right groove 52 in plan view in the topsheet 2. preferable.

  On the outer side in the width direction of the left groove 51, the right groove 52, the front groove 53, and the rear groove 54, a pair of side grooves 6 and 6 are provided that are convexly curved inward in the width direction. The side grooves 6 and 6 are formed in the same manner as the groove 5. The side groove 6 extends along the longitudinal direction of the sanitary napkin 1 as a whole. The length along the longitudinal direction of the side groove 6 is preferably substantially the same as or longer than the distance between the foremost end of the front groove 53 and the rearmost end of the rear groove 54. As shown in FIG. 3, the side groove 6 extends to the middle of the absorber 4 in the thickness direction.

  On the skin contact surface side of both sides of the absorbent body 4, the top sheet 2 and the absorbent body 4 are joined by the side grooves 6 via the internal sheet 7. On the non-skin contact surface side of both sides of the absorbent body 4, the non-skin contact surface side of the absorbent body 4 and the internal sheet 7 are joined by an adhesive.

The back sheet 3 is disposed on the non-skin contact surface side of the absorbent body 4, and the water-repellent inner sheet 7 is further disposed on the non-skin contact surface side of both sides of the absorbent body 4. The leak-proof property of the bodily fluid absorbed by the absorber 4 is improved.
The folded side portions of the top sheet 2 are joined to the inner sheet 7 by an adhesive on the skin contact surface side, and joined to the back sheet 3 by an adhesive on the non-skin contact surface side.

Both end portions in the longitudinal direction of the top sheet 2 and the back sheet 3 are respectively extended from both side edges in the longitudinal direction of the absorbent body 4 and joined by a known joining method such as heat sealing.
On the non-skin contact surface side (outer surface) of the back sheet 3, a slip stopper (not shown) for fixing the sanitary napkin 1 to the wearer's shorts or the like is provided. The slip stopper is covered with a release paper (not shown) and protected when not in use.

  Before use, the sanitary napkin 1 of the present embodiment has a folding line in the vicinity of the boundary line between the front part A and the excretion part facing part B and the boundary line between the excretion part facing part B and the rear part C. As shown in FIG. 4, it is folded in three. In use, the tab tape 8 is removed, and the front part A and the rear part B that are folded are opened outward in the longitudinal direction.

  The sanitary napkin 1 of this embodiment is worn by being fixed to the inside of the crotch part such as shorts. The surface sheet 2 in the excretion part opposing part B of the sanitary napkin 1 contacts the excretion part of the wearer. At this time, the sanitary napkin 1 receives a compressive force from the left and right to the inner side in the width direction by the inner sides of the thighs of the wearer. In the present invention, the term “curve convex” includes not only the case of being deformed into a curved convex shape but also the case of being deformed into a straight (polygonal) convex shape.

  Next, the effect of the sanitary napkin 1 of this embodiment will be described. In the sanitary napkin 1 of the present embodiment, the left groove 51 and the front groove 53, the left groove 51 and the rear groove 54, the right groove 52 and the front groove 53, and the right groove 52 and the rear groove 54 are separated from each other. The front end portion 51A of the left groove 51 and the front end portion 52A of the right groove 52 are located on the front side in the longitudinal direction from the rear end portions 53A and 53B of the front groove 53, and the rear end portion 51B and the right groove 52 of the left groove 51 are located. The rear end portion 52B is located on the rear side in the longitudinal direction with respect to the front end portions 54A and 54B of the rear groove 54. Therefore, the leak-proof property of the width direction by the groove | channel 5 provided in the skin contact surface side of the absorption layer 10 is fully ensured. Moreover, stability of the surface shape of the absorption layer 10 at the time of mounting is high.

  More specifically, the front end portion 51A of the left groove 51 and the front end portion 52A of the right groove 52 are frontward and inner side in the width direction with respect to the left rear end portion 53A of the front groove 53 and the right rear end portion 53B of the front groove 53, respectively. The rear end portion 51B of the left groove 51 and the rear end portion 52B of the right groove 52 are located on the rear side with respect to the left front end portion 54A of the rear groove 54 and the right front end portion 54B of the rear groove 54, respectively. It is located inside in the width direction.

  Therefore, according to the sanitary napkin 1 of the first embodiment, when the absorbent layer 10 receives a compressive force from the left and right inward in the width direction, the left groove 51 is virtually extended to the front end 51A side when worn. A substantially V-shaped fold line (not shown) consisting of a line and a right groove 52 virtually extending to the front end 52A side, and a line and right extending the left groove 51 virtually to the rear end 51B side A substantially V-shaped fold line S1 (see FIG. 2A) consisting of a line virtually extending the groove 52 toward the rear end portion 52B side is raised toward the wearer's skin side.

Therefore, in the sanitary napkin 1 according to the first embodiment, as shown in FIG. 5, the absorbent layer 10 is stably raised regardless of the thickness of the absorbent layer 10, and the excretory part M of the wearer. Fit and cover the excretion part M of the wearer. Moreover, the region sandwiched in the width direction between the left groove 51 and the right groove 52 in plan view in the absorbent layer 10 has enhanced surface shape stability, and the raised shape is stable during mounting. Maintained.
The cross-sectional shape along the longitudinal direction at the center in the width direction shown in FIG. 5 is as described above. However, the outer peripheral edge of the right groove 52 and the right rear end 53B of the front groove 53 shown in FIG. In the cross section along the longitudinal direction in the vicinity of the gap (including other similar gaps), the sanitary napkin 1 has the absorbent layer 10 shown in FIG. 5 and the excretory part of the wearer due to the gap between the grooves. It fits the wearer's excretion part M so that the separation shape with M disappears.

  Further, since the pair of side grooves 6 and 6 are provided on the outer side in the width direction from the left groove 51 and the right groove 52, respectively, when the sanitary napkin 1 is locally subjected to the compressive force in the width direction. However, the compressive force is dispersed throughout the longitudinal direction of the side groove 6 and propagates to the left groove and the right groove 52 that are convexly curved outward in the width direction, whereby the absorbing layer 10 is stably raised. Therefore, even if the compressive force toward the inner side in the width direction is not equal to the left and right, the absorbent layer 10 is well raised toward the wearer's skin.

  Next, the sanitary napkin of 2nd Embodiment of the absorbent article of this invention is demonstrated. The second embodiment will be described with a focus on differences from the first embodiment, and the description of the same points will be omitted. Therefore, the description of the first embodiment is appropriately applied to the second embodiment.

  As shown in FIG. 6, the sanitary napkin 1 according to the second embodiment has a positional relationship between the left rear end 53A of the front groove 53 and the front end 51A of the left groove 51, as compared to the first embodiment. The positional relationship between the right rear end portion 53B of the groove 53 and the front end portion 52A of the right groove 52, the positional relationship between the left front end portion 54A of the rear groove 54 and the rear end portion 51B of the left groove 51, and the right front end of the rear groove 54 The positional relationship between the portion 54B and the rear end portion 52B of the right groove 52 is different, but the other configurations are the same.

  Specifically, in the sanitary napkin 1 of the second embodiment, as shown in FIG. 6, the left rear end portion 53 </ b> A of the front groove 53 and the right rear end portion 53 </ b> B of the front groove 53 are respectively in the left groove 51. The front end 51A and the front end 52A of the right groove 52 are located on the rear side and on the inner side in the width direction. Further, the left front end portion 54A of the rear groove 54 and the right front end portion 54B of the rear groove 54 are located on the front side and the inner side in the width direction with respect to the rear end portion 51B and the rear end portion 52B of the right groove 52, respectively. is doing.

  An interval in the width direction (not shown) between the left rear end portion 53A and the right rear end portion 53B in the front groove 53 does not confine the absorbed liquid between the left groove 51 and the right groove 52, and the absorber 4 is effective. From the viewpoint of controlling the diffusion of the liquid, it is preferably 10 to 40 mm, and more preferably 15 to 30 mm. The preferable range of this interval is also applied to the widthwise interval W4 (see FIG. 6B) between the left front end portion 54A and the right rear end portion 54B in the rear groove 54.

  The widthwise interval W2 (see FIG. 6B) between the inner peripheral edge of the front end portion 51A of the left groove 51 and the inner peripheral edge of the front end portion 52A of the right groove 52 is easy to prevent leakage and form a widthwise fold line. That is, from the viewpoint of the stability of the individual packaging shape (workability and aesthetic appearance of the shape), it is preferably 15 to 50 mm, more preferably 20 to 40 mm. This preferable range of the interval W2 is also applied to the interval in the width direction (not shown) between the inner peripheral edge of the rear end portion 51B of the left groove 51 and the inner peripheral edge of the rear end portion 52B of the right groove 52.

  The distance (shortest distance) L4 between the outer peripheral edge of the front groove 53 and the front end portion 52A of the right groove 52 (see FIG. 6B) is preferably 1 to 10 mm from the viewpoint of easy formation of the widthwise fold line. More preferably, it is 3 to 6 mm. A preferable range of the distance L4 is a distance between the outer peripheral edge of the front groove 53 and the front end 51A of the left groove 51 (not shown), and a distance between the outer peripheral edge of the rear groove 54 and the rear end 51B of the left groove 51 (not shown). (Omitted), and the same applies to the distance (not shown) between the outer peripheral edge of the rear groove 54 and the rear end 52B of the right groove 52.

The width of the front end of each of the left rear end portion 53A and the right rear end portion 53B of the front groove 53 and the left front end portion 54A and the right front end portion 54B of the rear groove 54 is equal to the front end portion 51A and the rear end portion 51B of the left groove 51 and the right side. It is preferable that the width of the front end portion 52A and the rear end portion 52B of the groove 52 is narrower. The left rear end portion 53A and the right rear end portion 53B of the front groove 53 and the left front end portion 54A and the right front end portion 54B of the rear groove 54 are preferably tapered.
In addition, the preferable ranges of the lengths L1 to L3 and the intervals W1 and W3 in the first embodiment are also applied to the corresponding lengths L1 to L3 and the intervals W1 and W3 in the second embodiment, respectively.

  In the sanitary napkin 1 of the second embodiment, the left rear end 53A of the front groove 53 and the right rear end 53B of the front groove 53 are respectively connected to the front end 51A of the left groove 51 and the front end 52A of the right groove 52. On the other hand, it is located on the rear side and on the inner side in the width direction, and the left front end portion 54A of the rear groove 54 and the right front end portion 54B of the rear groove 54 are the rear end portion 51B and the rear end of the right groove 52, respectively. It is located on the front side and the inner side in the width direction with respect to the portion 52B.

  Therefore, according to the sanitary napkin 1 of the second embodiment, when the absorbent layer 10 receives a compressive force from the left and right inward in the width direction, the absorbent layer 10 is surrounded by the region surrounded by the front groove 53 and the rear groove 54. The formed region is a substantially V-shaped fold line S2 composed of a line virtually extending the front groove 53 toward the left rear end 53A and a line virtually extending the front groove 53 toward the right rear end 53B. [Refer to FIG. 6 (a)] and a substantially V-shape comprising a line in which the rear groove 54 is virtually extended to the left front end portion 54A side and a line in which the rear groove 54 is virtually extended to the right front end portion 54B side. The fold line S2 (see FIG. 6A) is raised as a flexible shaft toward the wearer's skin. On the other hand, the region sandwiched in the width direction between the left groove 51 and the right groove 52 in a plan view in the absorbent layer 10 is deformed to be convex toward the non-skin contact surface side. As a result, the sanitary napkin 1 according to the second embodiment has a shape smoothly curved toward the non-skin contact surface as a whole at the time of wearing.

  In the conventional sanitary napkin 1, as shown in FIG. 7 (a), a gap [enclosed by a one-dot chain line] is easily generated in the excretion part M of the curved wearer at the time of wearing. On the other hand, the sanitary napkin 1 according to the second embodiment, as shown in FIG. 7B, is less likely to cause a gap with respect to the excretion part M of the curved wearer and is in close contact with the excretion part M. Easy to do. For this reason, leakage due to the gap between the sanitary napkin 1 and the excretory part M is unlikely to occur. Moreover, the stability of the surface shape of the region surrounded by the front groove 53 and the region surrounded by the rear groove 54 in the absorbent layer 10 is enhanced, and the raised shape is stably maintained during mounting. Is done.

  Furthermore, the sanitary napkin of 3rd Embodiment and 4th Embodiment of the absorbent article of this invention is demonstrated. About 3rd Embodiment, it demonstrates centering on a different point from 1st Embodiment and 2nd Embodiment, and abbreviate | omits description about the same point. Therefore, the description of the first embodiment and the second embodiment is appropriately applied to the third embodiment. Further, the fourth embodiment will be described with a focus on differences from the third embodiment, and the description of the same points will be omitted. Therefore, the description of the third embodiment is appropriately applied to the fourth embodiment.

  As shown in FIG. 8, the sanitary napkin 1 according to the third embodiment is longer in the rear than in the first and second embodiments. In addition to the rear groove 54, the last groove 55 is provided in consideration of the use at night and night use. The positional relationship between the left rear end portion 53A of the front groove 53 and the front end portion 51A of the left groove 51 and the positional relationship between the right rear end portion 53B of the front groove 53 and the front end portion 52A of the right groove 52 are the first embodiment. The positional relationship between the left front end portion 54A of the rear groove 54 and the rear end portion 51B of the left groove 51 and the positional relationship between the right front end portion 54B of the rear groove 54 and the rear end portion 52B of the right groove 52 are as follows. The configuration is the same as that of the second embodiment, and other configurations are the same as those of the first embodiment.

  Specifically, in the sanitary napkin 1 of the third embodiment, as shown in FIG. 8, the left rear end portion 53 </ b> A of the front groove 53 and the right rear end portion 53 </ b> B of the front groove 53 are respectively in the left groove 51. The front end 51A and the front end 52A of the right groove 52 are located on the rear side and on the outer side in the width direction. Further, the left front end portion 54A of the rear groove 54 and the right front end portion 54B of the rear groove 54 are located on the front side and the inner side in the width direction with respect to the rear end portion 51B and the rear end portion 52B of the right groove 52, respectively. is doing. Therefore, the sanitary napkin 1 of the third embodiment has the characteristics of the first embodiment and the second embodiment.

  In the sanitary napkin 1 of the third embodiment, as shown in FIG. 8, a rear groove 55 is further provided behind the rear groove 54, and the rear groove 55 and the rear groove 54 have the same shape and size. Yes. In the sanitary napkin 1 of the third embodiment extended rearward by being formed in this way, the grooves 51 to 54 having the same effects as those applied to the first embodiment and the second embodiment are arranged. In addition, since the last groove 55 is further formed on the rear side, it is easier to fit the wearer's body and the effect of preventing leakage can be enhanced. Further, since there is a gap between the rear groove 54 and the last groove 55, it is possible to easily form a fold line during individual packaging. As in the third embodiment, one or a plurality of last grooves 55 can be further provided behind the rear groove 54 according to the length of the sanitary napkin, and the last groove 55 formed behind the rear groove 54 can be provided. It is applicable to sanitary napkins of various sizes by adjusting the length in the longitudinal direction.

  As shown in FIG. 9, the sanitary napkin 1 of the fourth embodiment has rear grooves 55 that surround both sides and the rear part of the rear groove 54, so that it can be more easily fitted to the wearer's body and can prevent leakage. Has been made to be able to enhance. Other configurations are the same as those of the third embodiment. The sanitary napkin 1 according to the fourth embodiment is more effective in preventing leakage than the fit to the body as compared with the sanitary napkin 1 according to the third embodiment. The length in the longitudinal direction of the rear groove 54 is 1.2 to 1.8 times longer than the length in the longitudinal direction of the front groove 53, and the fit property of the portion extended rearward in the sanitary napkin 1 Improves anti-moisture properties. The last groove 55 preferably has a length in the longitudinal direction that is 1.2 to 2.5 times longer than the length in the longitudinal direction of the rear groove 54, and 1.1 to 2 from the length in the width direction of the rear groove 54. It is preferable to have a width of 0.0 times.

The absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, the front groove 53 may have a sharp shape toward the front side, and the rear groove 54 may have a sharp shape toward the rear side.
Instead of using the water-repellent inner sheet 7, the back sheet 3 and the top sheet 2 are extended from the respective side edges of the absorbent body 4 to the outside in the width direction and joined to form a flap portion, thereby enhancing the leakage prevention effect. .
The absorbent article of the present invention is not limited to sanitary napkins, and can be applied to, for example, incontinence pads.

FIG. 1 is a perspective view showing a sanitary napkin which is a first embodiment of the absorbent article of the present invention. 2A and 2B are plan views of the sanitary napkin shown in FIG. 1, in which FIG. 2A is an overall view and FIG. 2B is a view showing only a groove. 3 is a cross-sectional view taken along line III-III shown in FIG. FIG. 4 is a perspective view showing a state in which the sanitary napkin shown in FIG. 1 is folded in three. FIG. 5 is a longitudinal longitudinal sectional view schematically showing a state where the sanitary napkin shown in FIG. 1 is attached. FIG. 6 is a plan view (corresponding to FIG. 2) showing the sanitary napkin of the second embodiment. FIG. 7A is a longitudinal longitudinal sectional view schematically showing a conventional sanitary napkin attached state, and FIG. 7B is a longitudinal direction schematically showing the attached state of the sanitary napkin shown in FIG. It is a longitudinal cross-sectional view. FIG. 8 is a plan view (corresponding to FIG. 2A) showing the sanitary napkin of the third embodiment. FIG. 9 is a plan view (corresponding to FIG. 2A) showing the sanitary napkin of the fourth embodiment.

Explanation of symbols

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 10 Absorbing layer 11 Leak-proof layer 2 Top sheet 3 Back sheet 4 Absorber 51 Left groove 51A Front end part 51B Rear end part 52 Right groove 52A Front end part 52B Rear end part 53 Front groove 53A Left rear end part 53B Right rear end part 54 Rear groove 54A Left front end 54B Right front end 55 Last groove 6 Side groove 7 Internal sheet 8 Tab tape A Front part B Excretion part facing part C Rear part S1, S2 Folding line

Claims (8)

An absorbent article comprising an absorbent layer and a leak-proof layer,
On the skin contact surface side of the absorbent layer, a left groove, a right groove, a front groove, and a rear groove are provided on the left side in the width direction, the right side in the width direction, the front side in the longitudinal direction, and the rear side in the longitudinal direction, respectively, in plan view. ,
The left groove and the right groove are each convexly curved outward in the width direction, and the front groove and the rear groove are each convexly curved outward in the longitudinal direction,
The left groove and the front groove, the left groove and the rear groove, the right groove and the front groove, and the right groove and the rear groove are separated from each other, and the front end portion of the left groove and the right groove The front end of the left groove is located on the front side in the longitudinal direction from the rear end of the front groove, and the rear end of the left groove and the rear end of the right groove are longer than the front end of the rear groove. Absorbent article located on the rear side.   The front end portion of the left groove and the front end portion of the right groove are located on the front side and inward in the width direction with respect to the left rear end portion of the front groove and the right rear end portion of the front groove, respectively. The rear end portion of the groove and the rear end portion of the right groove are located on the rear side and on the inner side in the width direction with respect to the left front end portion of the rear groove and the right front end portion of the rear groove, respectively. Absorbent articles.   The interval in the width direction between the inner peripheral edge of the front end portion of the left groove and the inner peripheral edge of the front end portion of the right groove is 10 to 40 mm, and the inner peripheral edge of the rear end portion of the left groove and the rear end portion of the right groove The absorptive article according to claim 2 whose interval in the width direction with the inner periphery is 10-40 mm.   The left rear end portion of the front groove and the right rear end portion of the front groove are located on the rear side and the inner side in the width direction with respect to the front end portion of the left groove and the front end portion of the right groove, respectively. 2. The left front end portion of the rear groove and the right front end portion of the rear groove are located on the front side and inward in the width direction with respect to the rear end portion of the left groove and the rear end portion of the right groove, respectively. Absorbent articles.   The widthwise interval between the inner periphery of the left rear end portion and the inner periphery of the right rear end portion in the front groove is 10 to 40 mm, and the inner periphery of the left front end portion and the inner periphery of the right rear end portion in the rear groove The absorptive article according to claim 4 whose width direction interval is 10-40 mm.   The front end portion of the left groove and the front end portion of the right groove are located on the front side and the inner side in the width direction with respect to the left rear end portion of the front groove and the right rear end portion of the front groove, respectively. The left front end portion of the groove and the right front end portion of the rear groove are located on the front side and the inner side in the width direction with respect to the rear end portion of the left groove and the rear end portion of the right groove, respectively. Absorbent article.   The interval in the width direction between the inner peripheral edge of the front end of the left groove and the inner peripheral edge of the front end of the right groove is 10 to 40 mm, and the inner peripheral edge of the left front end and the right rear end of the rear groove The absorptive article according to claim 6 whose interval in the width direction is 10 to 40 mm. The absorbent layer includes a liquid-permeable surface sheet and a liquid-retaining absorbent,
The absorbent article according to any one of claims 1 to 7, wherein a thickness of the absorbent body is 3 to 30 mm in a region sandwiched between the left groove and the right groove in a plan view.

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