JP2001204760A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article which is capable of effectively preventing liquid leakage by fitting to an excretion area at all times in follow up to the movement of a wearing person. SOLUTION: The absorptive article 1 is constituted by disposing a build-up part forming sheet 5 between an absorption layer 4 and a rear surface layer 3. Both sides thereof are respectively fixed to a build-up part forming elastic member 6 in the state that the member is extended in a transverse direction. The sheet 5 builds up to the front surface layer 2 side in the contracting state of the elastic member, thereby forming a projecting build-up part 7. The absorptive article 1 is provided with a leakproof part 13 having a rising leakproof wall 13a and a leakproof surface 13b which is disposed successively with the leakproof wall 13a and extends approximately horizontally toward the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article having excellent fit and liquid leakage prevention.

[0002]

2. Description of the Related Art Absorbent articles whose elastic member is stretched and whose contraction force causes the surface of the absorbent article to have a convex shape to improve the fit to the wearer's body. Has been proposed. For example, Japanese Patent Application Laid-Open No. 9-507033 discloses that an elastic member extended in the width direction of a napkin is fixed to a non-skin contact surface side of an absorbent core in a sanitary napkin, and the elastic member contracts to form a napkin. A technique in which the surface has a convex shape is disclosed. In this napkin, a convex shape is formed only by the absorbent core. In order for the absorbent core itself to keep the convex shape stable against the movement of the wearer, it is necessary to increase the rigidity of the absorbent core. However, if the rigidity is too high, the ability of the absorbent core to follow the wearer's body is poor, and the fit is reduced. That is, maintaining the convex shape stably by the absorbent core itself and improving the followability to the wearer's body are contradictory events.

[0003] Japanese Patent Application Laid-Open No. 11-313851 discloses that a backing sheet having a higher bending rigidity than the liquid-absorbent core is disposed on the non-skin contact surface side of the liquid-absorbent core, and the backing sheet and the elastic member are provided. A sanitary napkin in which an inverted V-shaped space is formed inside an absorbent article by combining the above is disclosed.
The backing sheet is a nonwoven fabric, a plastic film,
It is made of a sheet material such as an open plastic film and has higher rigidity than the liquid-absorbent core. Therefore, if the backing sheet is used, the space can be formed, but at the same time, the high rigidity also causes a reduction in the flexibility and flexibility of the sheet. As a result, a gap is easily formed between the excretory part of the wearer and the napkin, or the feeling of wearing the napkin is likely to be deteriorated.

The napkin has a leak-proof cuff to which elastic members are attached on both sides thereof, and has a W-shaped cross section in the width direction. However, since the elastic member is attached only to the free end of the leak-preventing cuff, the leak-preventing cuff falls down inward in the width direction of the napkin due to the movement of the wearer, and the fit is likely to deteriorate. As a result, the liquid receiving area decreases, and liquid leakage easily occurs.

[0005] Accordingly, an object of the present invention is to provide an absorbent article which can always fit into the excretory part in response to the movement of a wearer and can effectively prevent liquid leakage.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an absorbent having a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retentive absorbing layer interposed between the surface layer and the back layer. A ridge-forming sheet having a fold recovery property is disposed between the absorbent layer and the back surface layer, wherein the ridge-forming sheet has a ridge in which both side portions are stretched in the width direction. The ridge-forming sheet is fixed to the portion-forming elastic member, and in the contracted state of the ridge-forming elastic member, the ridge-forming sheet bulges toward the surface layer side, and a convex ridge is formed at a substantially central portion in the width direction of the absorbent article. Is formed, and a leak-proof part is formed on each of both side edges of the absorbent article, and the leak-proof part is a leak-proof wall rising substantially upward from both side edges of the absorbent article, Substantially horizontally extending outward from the absorbent article in the width direction of the absorbent article It is obtained by achieving the above object by providing an absorbent article having a substantially planar proof cotton extending stone obliquely upward.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. In FIG.
Sanitary napkin as one embodiment of the absorbent article of the present invention, a plan view viewed from the top sheet side is shown,
FIG. 2 is a sectional view taken along line II-II in FIG.

A sanitary napkin 1 shown in FIG. 1 has a vertically long shape, and a top sheet 2 constituting a liquid-permeable surface layer, a back sheet 3 constituting a liquid-impermeable back layer, and a top sheet. Liquid absorbing layer 4 is interposed between second sheet 2 and back sheet 3. On the outer surface of the back sheet 4, pressure-sensitive adhesive layers 9, 9 for fixing the napkin 1 to clothes of a wearer are formed. As the above members, the same members as those used in the conventional napkin can be used.

[0009] A rectangular ridge-forming sheet 5 is arranged between the absorbing layer 4 and the back sheet 3. The ridge forming sheet 5 is disposed at a position deviated forward from the longitudinal center of the napkin 1. The ridge forming sheet 5
It is in contact with the lower surface of the absorbing layer 4 and is intermittently fixed to the lower surface of the absorbing layer 4. The left and right sides on the lower surface of the ridge forming sheet 5 are joined and fixed to the left and right sides on the upper surface of the ridge forming elastic member 6 also formed of a rectangular sheet. The right and left sides of the lower surface of the ridge-forming elastic member 6 are fixedly connected to the upper surface of the back sheet 3. This joint position substantially opposes the joint position between the ridge-forming sheet 5 and the ridge-forming elastic member 6.
The ridge-forming elastic member 6 is joined and fixed to the ridge-forming sheet 5 in a state of being extended in the width direction. The ridge-forming elastic member 6 is fixedly joined to the back sheet 3 in its free state (relaxed state). Further, at the joint position between the ridge forming sheet 5 and the ridge forming elastic member 6,
The absorbent layer 4 and the top sheet 2 are integrally joined and fixed together with these members, and are compacted. In the napkin 1 of the present embodiment, in the free state (relaxed state), the ridge-forming elastic member 6 is in a contracted state, whereby the ridge-forming sheet 5 rises toward the top sheet 2. . As a result, the convex ridge 7 is formed at a substantially central portion in the width direction of the napkin 1 and at a position deviated forward from the central portion in the longitudinal direction.

The shape of the raised portion 7 is not particularly limited as long as it can fit the excretory portion of the wearer, and examples thereof include an inverted U-shape and an inverted V-shape.

As the ridge forming sheet 5, a sheet which can stably hold the convex shape of the ridge 7 is preferably used. For example, a nonwoven fabric or a foam made of a thermoplastic resin may be used. The nonwoven fabric is composed of, for example, fibers made of synthetic resins such as polyethylene, polypropylene, polyester, nylon, and polyurethane, and core-sheath type or side-by-side type composite fibers made of a combination of these two resins. You. The foam is made of polyethylene, vinyl acetate, polyurethane, polybutadiene, or the like.

The ridge-forming sheet 5 preferably has appropriate rigidity, bending recovery and flexibility. As a method for imparting such properties to the ridge-forming sheet 5, a non-woven fabric or a foam made of the resin described above may be used.
What is necessary is just to perform heat compression molding partially using heat embossing etc. In particular, it is preferable to perform the thermal compression molding so that a flexible shaft for bending is formed along the longitudinal direction of the ridge-forming sheet 5.

FIG. 3 shows the thermal compression molding pattern.
3A, the wavy line pattern shown in FIG. 3B, the rhombic lattice pattern shown in FIG.
A turtle-shaped pattern shown in (d) and a circular pattern shown in FIG. 3 (e) are preferably exemplified, but are not limited thereto.

In particular, as shown in FIG. 2, the ridge-forming sheet 5 is composed of two sheets 5a and 5b of the same type or different types.
It is preferable to use a sheet having a non-adhesive portion 52 that is joined and is separated between the adherent portions 51 so that rigidity, bending recovery and flexibility are further improved. Such a ridge forming sheet 5 can be manufactured by, for example, steel match embossing. Further, in the raised portion forming sheet 5 shown in FIG. 2, a sheet different from these sheets is interposed between the two sheets 5a and 5b. It is also preferable to use a sheet in which the three members are in a non-consolidated state in the non-contact portion 52.

As the ridge-forming sheet 5 having appropriate rigidity, bending recovery and flexibility, in addition to the above-mentioned ones, a core-sheath type crimped in a two-dimensional or three-dimensional shape or a side-by-side type.
A suction heat-bonded nonwoven fabric formed by depositing side-type composite fibers by an air laid method to form a fiber web and fusing the entangled points of the constituent fibers in the fiber web with hot air is also preferably used. The conjugate fiber constituting the suction heat-bonded nonwoven fabric is 5 to 5.
It is preferably a short fiber of about 15 mm.

The raised portion forming sheet 5 has a basis weight of 30 to
500 g / m ^2, in particular to be 50 to 300 g / m ^2, the holding of the convex shape of the raised portion 7, and from the viewpoint of fit improvement ridges 7 to the wearer's body. The ridge forming sheet 5 has a thickness of 490 Pa (5 gf /
cm ² ) 0.3 to 5 mm, especially 0.5 to 5 mm under load
The thickness of 3 mm is preferable in terms of stable formation of the raised portion 7, prevention of discomfort of the napkin 1 during mounting, and flexibility and flexibility of the raised portion 7.

The ridge-forming sheet 5 has a bending rigidity of 2
× 10 ^{-3 to} 5 × 10 ^-2 gf · cm ² / cm, especially 3 × 1
0 ^{−3 to} 2 × 10 ⁻² gf · cm ² / cm, stable formation of the raised portion 7, prevention of discomfort of the napkin 1 during mounting,
This is preferable in terms of the flexibility and flexibility of the raised portion 7 and the ability of the napkin 1 to follow the body during wearing.

Further, the raised portion forming sheet 5 is
The resilience is 1 × 10^-3~ 2.5 × 10 ^-2gf · cm / c
m, especially 2 × 10^-3~ 2 × 10^-2gf · cm / cm
During wearing, due to the wearer's walking or other movement.
When compression is applied from the width direction of the pukin 1,
The point that the spontaneousness becomes good and the discomfort of the napkin 1 being worn
It is preferable from the point of preventing.

The bending stiffness and the bending recovery force are measured as follows. For measurement, KES-F manufactured by Kato Tech
B2 (product name) is used. The ridge-forming sheet 5 is cut out to a length of 20 mm in a direction corresponding to the longitudinal direction of the absorbent article and 40 mm in a direction corresponding to the width direction of the absorbent article, and used as a measurement sample. The longitudinal direction of the measurement sample (20m
m) is fixed to the chucks (distance between the chucks is about 1 cm), and the curvature acceleration (bending deformation rate) is 0.5 cm ⁻¹ /
After the bending deformation to 2.5 cm ^{-1 in} sec, the film is restored to the original state at the same speed. Bending moment M1 and curvature 1.5 at a curvature of 0.5 cm ^-1 during bending deformation
The bending moment M2 at the time of cm ^-1 is obtained, and the curvature is 0.5 cm.
^The bending moment required for deformation from ^-1 to a curvature of 1.5 cm ^{-1 is} obtained from the following equation (1), and this value is defined as bending rigidity. Flexural rigidity = M2-M1 (1) The bending recovery force is measured as follows. Using the same measurement method as for bending stiffness,
After bending the measurement sample to a curvature of 2.5 cm ^−1, a bending recovery moment M3 when the curvature of the measurement sample recovers to a curvature of 1.5 cm ⁻¹ in the process of recovering the original state is determined. This value is defined as the bending recovery power.

The ridge-forming elastic member 6 is made of a material that can expand and contract. Examples of the material include natural rubber, polybutadiene, polyurethane, styrene-butadiene copolymer, styrene-isoprene copolymer, ethylene and 1-
Examples include an ethylene-α-olefin copolymer such as a copolymer with octene, and a copolymer of ethylene and ethyl acrylate.

The ridge-forming elastic member 6 may be a film, a nonwoven fabric, a woven fabric, or the like made of the above-mentioned material. Also,
A plurality of thread-like bodies or narrow band-like bodies composed of the above-mentioned materials may be arranged at predetermined intervals or without any intervals in parallel with the width direction of the napkin 1.

The ridge-forming elastic member 6 and the ridge-forming sheet 5 are joined and fixed to each other at positions on both sides thereof, and are not fixed at other positions.
The fixed distance between the ridge-forming elastic member 6 and the ridge-forming sheet 5 is 15 to 70 mm, particularly 30 to 60 mm, as the maximum length when the ridge-forming elastic member 6 is extended, and it is determined by the wearer. This is preferable because a raised portion 7 having a height sufficient to appropriately fit the excretory portion is formed. The maximum length is an interval at which the ridge-forming elastic member 6 is fixed to the ridge-forming sheet 5, and is not a distance in a state where the ridge-forming elastic member 6 is contracted, but a ridge formed by extending the ridge-forming elastic member 6. It means a fixing interval when fixing to the part forming sheet 5.

The method of fixing the ridge-forming elastic member 6 and the ridge-forming sheet 5 includes bonding using a hot melt adhesive, ultrasonic sealing, heat sealing, and the like.

It is particularly preferable that the top sheet 2, the absorbing layer 4, the ridge-forming sheet 5 and the ridge-forming elastic member 6 are integrally joined and fixed by hot embossing at the same time as forming the leak-proof groove described later. Is preferable in terms of simplifying the manufacturing process. At the same time, as shown in FIG.
The left and right sides on the lower surface of the raised portion forming elastic member 6 are joined and fixed to the back sheet 3 by hot melt adhesives 8,8. The pressure-sensitive adhesive layers 9 are formed on the outer surface of the back sheet 3 as described above. The pressure-sensitive adhesive layer 9 has a band-like shape extending in the longitudinal direction of the napkin 1, and is formed in two pieces. It is preferable that the pressure-sensitive adhesive layers 9 and 9 are not provided at the center in the width direction of the napkin 1 where the top of the raised portion is located. The width of the region where the pressure-sensitive adhesive layer is not formed at the central portion in the width direction of the napkin 1, that is, the interval between the width-direction inner edges of the pressure-sensitive adhesive layers 9, 9 is 5
It is preferably from 40 to 40 mm, particularly preferably from 10 to 25 mm. By setting the bonding state of the protrusion-forming elastic member 6 and the formation pattern of the pressure-sensitive adhesive layers 9 and 9 in this manner,
A raised portion 7 having a height sufficient to appropriately fit the excretory portion of the wearer is formed, and the followability of the raised portion 7 is improved both during wearing and during movement of the wearer.

As shown in FIGS. 1 and 2, on the top sheet 1 side of the napkin 1, there is formed a leak-proof groove 10 capable of absorbing liquid, which is formed by compacting the constituent members thereof. The leak-proof groove 10 has a substantially semicircular front groove 10a, a central groove 10b curved in the direction of a center line along the longitudinal direction of the napkin 1, and a rear part formed by cutting an elongated elliptical shape at a short diameter portion. It is composed of a groove 10c. These grooves are continuous, and surround the raised portion 7 over the entire circumference to form a closed structure. As used herein, "around the ridge" means at least a portion of the area around the ridge. By forming the leak-proof groove 10 around the raised portion 7, even if the absorbing layer 4 in the raised portion 7 absorbs a large amount or more than the limit amount, even if the liquid flows out along the surface of the raised portion 7, , The leaked liquid is leak-proof groove 1
Absolutely absorbed by 0. As a result, liquid leakage is extremely effectively prevented.

In particular, as shown in FIG. 1, the high-pressure consolidation region 11 and the low-consolidation region 12 are alternately formed in the leak-preventing groove 10, so that the liquid in the leak-preventing groove 10 is formed. Absorption performance is improved.

Although the depth of the leakage preventing groove 10 is related to the thickness of the absorbing layer 4, the distance from the upper surface to the lower surface of the groove is 1 mm.
As described above, it is particularly preferable that the thickness be 2 mm to 10 mm from the viewpoint of an effect of blocking the liquid flowing out along the surface of the raised portion 7. For the same reason, the width of the leakage prevention groove 10 is 1 mm or more,
In particular, it is preferably 1.5 to 5 mm.

As described above, the leakage preventing groove 10 is formed by integrally compacting the top sheet 2, the absorbent layer 4, the ridge-forming sheet 5 and the ridge-forming elastic member 6 by hot embossing. Is preferred.

The napkin 1 has a thickness T (see FIG. 2) at the position of the raised portion 7 of 490 Pa (5 gf / c).
m ² ) Under load, 5 to 20 mm, especially 7 to 15 mm
(Hereinafter, the thickness under this load is T
₅ ). 490Pa weights under the wearer corresponds to the load applied to the absorbent article in the absence of motion in a standing state wearing the absorbent article, that is the thickness T ₅ at this time falls within the range, the wearer A ridge 7 is formed that is high enough to properly fit the excretory area.

The napkin 1 preferably has a thickness of 3 to 10 mm, particularly 4 to 8 mm under a load of 4903 Pa (50 gf / cm ² ) at the position of the raised portion 7 (hereinafter, the thickness under this load is referred to as a napkin 1). that T _50). 4
The 903 Pa load corresponds to the load applied to the absorbent article when the wearer sits or runs, and the thickness T at this time is
_{By 50} is within the range, similarly to the above-described reason relates T _5, the ridges 7 of sufficient height to fit properly in the excretion portion of the wearer is formed.

Further, the napkin 1 preferably has a ratio of T ₅ to T ₅₀ , that is, a value of T ₅ / T ₅₀ of 1.5 to 4, particularly preferably 2 to 3.5. The value of T ₅ / T ₅₀ is a measure of the compression recovery at the ridge 7 of the napkin 1,
By value of ₅ / T ₅₀ is the range of the deformation followability of the napkin 1 becomes sufficient to changes in mounting pressure due to movement of the wearer, fit is sufficiently high.

T ₅ and T ₅₀ are measured for a region of 1 cm × 1 cm at the position of the ridge 7 of the napkin 1.

On both side edges of the napkin 1, leak-proof portions 13 are formed. The leak-proof portion 13 is provided with a leak-proof wall 13 a rising substantially upward from both side edges of the napkin 1, and connected to the leak-proof wall 13 a and substantially horizontally or obliquely upward toward the outside in the width direction of the napkin 1. And a substantially planar leak-proof surface 13b extending therefrom. Due to the formation of the leak preventing portion 13, even if the absorption layer 4 in the raised portion 7 absorbs a large amount or more than the limit amount, even if the liquid flows out along the surface of the raised portion 7, the liquid flows out. The liquid is leakproof wall 13
a prevents further outflow. As a result, liquid leakage is extremely effectively prevented. Moreover, the leak-proof surface 13
Since b is flat, the leak-proof surface 13b comes into contact with the groin of the wearer. This makes the liquid less likely to leak.

The connecting portion 1 between the leak-proof wall 13a and the leak-proof surface 13b
3c and the free end 13d of the leak-proof surface 13b, respectively.
First elastic member 14a extending in the longitudinal direction of the absorbent article
And the second elastic member 14b is arranged in an extended state. By arranging the first elastic member 14a, the leakage preventing wall 13a effectively rises upward along the longitudinal direction of the napkin 1. Further, by disposing the second elastic member 14b, the planar shape of the leakage preventing surface 13b is maintained, and a force acts to pull the leakage preventing wall 13a outward in the width direction of the napkin 1. As a result, the liquid receiving area on the top sheet 2 side of the napkin 1 is enlarged, and liquid leakage is effectively prevented.
If the second elastic member 14b is not provided,
a falls down inward in the width direction of the napkin 1, and the liquid receiving area is greatly reduced.

The leak-proof wall 13a and the leak-proof surface 13b are integrally formed from two liquid-impervious sheets that are folded back. The folded portion of the sheet becomes the free end 13d of the leak-proof surface 13b, and the second elastic member 14b is disposed inside the folded portion. Further, a first elastic member 14a is disposed at a position inward of the folded portion, and this position is a continuous portion 13c of the leak preventing wall 13a and the leak preventing surface 13b. The sheet is joined and fixed to the top sheet 2 extending outward from both side edges of the absorbent layer 4 at the joint fixing position 15 located further inward from the continuous portion 13c. A region from the joint fixing position 15 to the continuous portion 13c in the sheet constitutes a leak-proof wall 13a. As the sheet, a nonwoven fabric composed of hydrophobic fibers, a laminated sheet of a nonwoven fabric and a film, or the like can be used.

The leak preventing wall 13a and the leak preventing surface 13b are formed as follows. First, the sheet is folded to form two sheets, and the sheet and the top sheet 2 extending outward from both side edges of the absorbent layer 4 are joined and fixed along the longitudinal direction of the napkin 1. Next, the folded portion of the sheet is directed outward in the width direction of the napkin 1, and under this condition, the longitudinal front and rear ends of the sheet are joined and fixed to the longitudinal front and rear ends of the napkin 1. . Thereby, the leak-proof wall 13a and the leak-proof surface 13b are respectively formed.

First elastic member 14a and second elastic member 14
b is made of a thread-like body or a narrow band-like body, and its constituent material can be the same as that of the ridge-forming elastic member 6.
The number of the first elastic members 14a and the number of the second elastic members 14b disposed on the continuous portion 13c and the free end portion 13b may be one, or may be two or more. In particular, as in the present embodiment,
When the elastic members are arranged on both the continuous portion 13c and the free end portion 13b, the shape of the leak-proof surface 13b is stably maintained, and the force for pulling the leak-proof wall 13a outward in the width direction of the napkin 1 is increased. Work more. As a result, the liquid receiving area on the top sheet 2 side of the napkin 1 is kept more stable against the movement of the wearer.

The second elastic member 1 disposed at the free end 13d
4b, the distance W between the outermost elastic members
(See FIG. 2) is made larger than the width of the crotch in the shorts of the wearer, so that the leak-proof surface 13 is
Part of b will be located outside the shorts. As a result, both sides of the crotch portion of the shorts are provided with the leak-proof surface 13b.
Is in close contact with the groin of the wearer, and liquid leakage is more effectively prevented. The said interval W is 80-120 mm, especially 85-1.
It is preferable that it is 10 mm from the viewpoint of further preventing liquid leakage.

As shown in FIG. 2, the sheet constituting the leak-proof wall 13a and the leak-proof surface 13b further extends outward from the joint fixing position 15 in the width direction of the napkin 1. As a result, wing portions 16, 16 extending outward from both side edges of the napkin 1 are formed. The surface of the wing portion 16 on the side of the back sheet 3 includes the wing portion 1
A pressure-sensitive adhesive layer 17 for fixing 6 to a wearer's clothes is formed.

Each wing portion 16 is located on the side of the portion of the napkin 1 where the raised portion forming sheet 5 is arranged. Therefore, when the napkin 1 is worn, the wings 16
Is folded, the leak-proof wall 13a further spreads outward in the width direction of the napkin 1. As a result, the liquid receiving area on the top sheet 2 side of the napkin 1 is further expanded, and liquid leakage is more effectively prevented.

The present invention is not limited to the above embodiment.
For example, in the above embodiment, the leakage preventing groove 10 is
Is formed over the entire circumference, but instead, for example, a pair of leakage prevention grooves 10 may be formed only on both sides of the raised portion 7 (that is, only the central groove 10b may be formed). .

The leak preventer 13 may be formed over substantially the entire area of the napkin 1 in the longitudinal direction, or may be formed only at a position on the side of the raised portion 7.

In the above embodiment, the ridge-forming elastic member 6 is joined and fixed to the back sheet 3 in its free state (relaxed state). Instead, the ridge-forming elastic member 6 is extended. In this state, it may be fixed to the back sheet 3 by bonding. Also by this, the ridge-forming sheet 5 is raised toward the top sheet 2 by the contraction of the ridge-forming elastic member 6, and the ridge 7 is formed.

In the above-described embodiment, the wing portion 16 is formed by extending the sheet constituting the leakage preventing wall 13a and the leakage preventing surface 13b outward in the width direction of the napkin 1. Instead, the back sheet 3 is extended outward in the width direction of the napkin 1, and the extended back sheet 3
And the sheet may be bonded to form a wing portion.

Further, the entirety of the leakage preventing wall 13a and the leakage preventing surface 13b may be made of an elastic material (sheet).
In this case, the material (sheet) also functions as the first elastic member 14a and the second elastic member 14b.

Further, the leakage preventing wall 13a and / or the leakage preventing surface 13
In b, an absorbent layer may be formed on the side facing the wearer.

Further, the top sheet 2 and the absorbent layer 4 as the surface layers are extended outward in the width direction of the napkin 1 and a part of the leakage preventing wall 13a and / or the leakage preventing surface 13b is formed from these materials. You may comprise all.

The absorbent article of the present invention can be similarly applied to a vaginal discharge sheet, an incontinence pad and the like, in addition to a sanitary napkin.

[0049]

According to the present invention, there is provided an absorbent article which can always fit into the excretory part in response to the movement of the wearer and can effectively prevent liquid leakage.

[Brief description of the drawings]

FIG. 1 is a plan view of a sanitary napkin as one embodiment of an absorbent article according to the present invention, as viewed from a top sheet side.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a schematic view showing a ridge-forming sheet used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorption layer 5 Ridge formation sheet 6 Ridge formation elastic member 7 Ridge 10 Leak prevention groove 13 Leak prevention part 13a Leak prevention wall 13b Leak prevention surface 14a First elastic member 14b First 2 elastic members

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tetsuya Kusakawa 2606 Akabane, Kaigamachi, Haga-gun, Tochigi Prefecture F-term in Kao Corporation Research Institute 4C003 EA03

Claims (5)

[Claims] 1. An absorbent article having a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retentive absorbing layer interposed between the surface layer and the back layer. A ridge forming sheet having a fold recovery property is arranged between the back layer and the ridge forming sheet, and both side portions of the ridge forming sheet are fixed to the ridge forming elastic members that are stretched in the width direction, respectively. In the contracted state of the ridge-forming elastic member, the ridge-forming sheet is raised toward the surface layer, and a convex ridge is formed at a substantially central portion in a width direction of the absorbent article. Leak-proof parts are respectively formed on both side edges of the absorbent article, and the leak-proof parts are connected to the leak-proof wall rising substantially upward from both side edges of the absorbent article and the leak-proof wall. And extending substantially horizontally or obliquely upward toward the outside in the width direction of the absorbent article Absorbent article having a planar proof cotton. 2. A space W between the outermost elastic members of the elastic members arranged at the free ends of the respective leak-proof surfaces.
Is 80 to 120 mm. 3. The absorbent article according to claim 1, wherein the thickness T at the position of the raised portion is 5 to 2 under a load of 490 Pa.
0mm and 3-10mm under 4903Pa load
And the thickness under a load of 490 Pa and 4903 Pa
The ratio to the thickness under load (former / latter) is 1.5 to 4
The absorbent article according to claim 1 or 2, wherein 4. The ridge-forming sheet is made of a non-woven fabric or a foam having a basis weight of 30 to 500 g / cm ^{2 made} of a thermoplastic resin, and a flexible shaft for bending is provided on the ridge-forming sheet. As formed along the longitudinal direction,
The absorbent article according to any one of claims 1 to 3, wherein the ridge-forming sheet is embossed. 5. A wing portion extending outward from both side edges of the absorbent article, wherein each wing portion is located on a side of a portion of the absorbent article on which the ridge-forming sheet is arranged. The absorbent article according to any one of claims 1 to 4, which is located.