JPH10328233A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which can be manufactured easily, worn easily, take a predetermined shape with an excellent fit without twisting to provide a good wearing feel, and exhibit a good anti-leakage property. SOLUTION: In an absorbent article, which includes a liquid-permeable layer on its side abutting to the skin, a liquid-impermeable layer on its side not abutting to the skin, and an absorbing part A interposed between the liquid- permeable layer and the liquid-impermeable layer, and which is made substantially oblong, a raised part 13a raised toward the abutting side to the skin and extending in the longitudinal direction of the absorbent article is provided in the rear of the absorbing part, and a rear groove 18 extending in the longitudinal direction of the absorbing article at the center of the width of the absorbent article is provided in the side of the absorbing part corresponding to the raised part 13a and not abutting to the skin. The liquid-impermeable layer comprises a liquid-impermeable back sheet 12b, which is arranged on a plane and not grooved along the rear groove 18 in the absorbing part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an absorbent article, such as a sanitary napkin or an incontinence pad, which is attached to a human crotch and absorbs bodily fluids. Also, the present invention relates to an absorbent article that has a predetermined shape with a good fit and a good fit without being distorted and that exhibits good leakage prevention.

[0002]

2. Description of the Related Art In general, a liquid permeable layer is provided on the skin contacting surface side, a liquid impermeable layer is provided on the non-skin contacting surface side, and the liquid permeable layer and the liquid impermeable layer are not provided with the liquid permeable layer. Absorbent articles with an intervening absorber are well known. Such absorbent articles are used as sanitary napkins, incontinence pads, panty liners and the like, and it is important that they fit well to the wearer and prevent leakage well.

[0003] For this reason, various techniques have conventionally been proposed to avoid leakage by making the rear part of the absorbent article higher on the skin contact surface side so that the rear part is fitted well to the buttocks of the wearer. ing. In the technology described in JP-A-61-5746, the technology described in JP-A-64-70051, and the technology described in JP-A-61-191360,
The rear part of the absorbent article is formed in a rectangular shape whose cross-section at the center in the width direction is convex toward the skin contact surface side. In addition, 63-2081
In the technique described in Japanese Patent Application Laid-Open No. 9, the absorber is formed thicker toward the center in the width direction at the rear portion, and is raised toward the skin contact surface along the longitudinal direction.

[0004] However, in the technology described in JP-A-61-5746, the technology described in JP-A-64-70051, and the technology described in JP-A-61-191360, the absorbent articles are heated one by one. Since the rear portion is formed to have a rectangular cross section by molding or the like, there is a problem that a great deal of labor is required for manufacturing.
In addition, when an adhesive portion for fixing to the underwear is formed on the non-skin contact surface of the rear portion, the adhesive portions are easily adhered to each other, it is difficult to fix to the underwear, and there is a problem such as leakage during mounting. There is a point. The technique described in Japanese Utility Model Application Laid-Open No. 63-20819 has a problem that the widthwise central portion of the rear portion becomes uncomfortable due to thickening, and the side edge portion of the rear portion is thin and easily leaks to cause leakage.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an absorbent material which can be easily manufactured, easily mounted, has a good fitting feeling without being distorted, and has a predetermined shape with excellent fit, and exhibits a good leak-proof property. To provide a sexual article.

According to the present invention, there is provided a liquid permeable layer on the skin contact surface side, a liquid impermeable layer on the non-skin contact surface side, and an absorbing portion interposed between the liquid permeable layer and the liquid impermeable layer. A substantially vertically elongated absorbent article, comprising, at a rear portion of the absorbing section, a raised section extending in a longitudinal direction of the absorbent article, which is raised toward a skin contact surface side; A non-skin contact surface side of the absorbent portion corresponding to the portion has a rear groove extending in the longitudinal direction of the absorbent article at the center in the width direction of the absorbent article, and the liquid impermeable layer has a liquid impermeable layer. It consists of a transparent back sheet, the back sheet is arranged in a plane, and by providing an absorbent article characterized by not being subjected to groove processing along the rear groove of the absorbing portion, The above object has been achieved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the absorbent article according to the present invention will be specifically described below with reference to the drawings. FIG. 1 is a plan view showing a sanitary napkin as one embodiment of the absorbent article of the present invention as viewed from the skin contact surface side, and FIG. 2 is a cross-sectional view of the sanitary napkin of FIG. FIG. 3 is an enlarged plan view of the sanitary napkin absorber of FIG. 1 viewed from the non-skin contact surface side, and FIG. 4 is a KK of the sanitary napkin absorber of FIG. FIG. 5 is a sectional view, and FIG.
It is sectional drawing which shows the mounting state of the sanitary napkin.

As shown in FIG. 1 or 2, the absorbent article (sanitary napkin) 1 of the present embodiment has a liquid permeable layer P on the skin contact surface side and a liquid impermeable on the non-skin contact surface side. It is provided with a layer I and an absorbing portion A interposed between the liquid permeable layer P and the liquid impermeable layer I, and is formed substantially vertically.

More specifically, in the sanitary napkin 1 of the present embodiment, the liquid permeable layer P is a liquid permeable surface sheet 1
1, the liquid impermeable layer I is formed by a first back sheet 12a and a second back sheet 12b, which are liquid impermeable sheets, and the absorbing portion A is formed by the absorber 13. Have been. Then, in the sanitary napkin 1 of the present embodiment, as shown in FIG. 2, the surface of the absorbent body 13 on the non-skin contact surface side, the both side surfaces, and the both side edges of the surface on the skin contact surface side are the second. The absorber 13 and the second back sheet 12b are covered with the top sheet 11b.
The napkin body 10 is formed by being sandwiched between the first back sheet 12a and the first back sheet 12a which is arranged in contact with the non-skin contact surface side of the second back sheet 12b. This napkin body 10
The heat-welding process is performed on both side edges from the skin contact surface side, and heat-welded portions 14, 14 in which the top sheet 11 and the second back sheet 12 b are heat-welded to the absorber 13 are formed. I have. The topsheet 11 and the absorber 13 are the napkin body 1
0 is fixed by heat welding at the side edges of the heat-welded portion 1
The second back sheet 12b and the absorber 13 are fixed to the side edge of the napkin main body 10 by hot melt agents 15,15.

The top sheet 11 and the first back sheet 12a extend outward from the left and right side edges of the napkin body 10 in the width direction, and have wings 20, 20 formed therein. The top sheet 11 and the first back sheet 12a are fixed to each other at their peripheral edges.

An adhesive is applied to the first back sheet 12a at the center in the longitudinal direction of the napkin body 10 to form an adhesive portion 16. The sanitary napkin is attached via the adhesive portion 16 at the time of mounting. 1 is fixed to the underwear. The adhesive portion 16 is protected by a release paper (not shown).

These structures are the same as those of the conventional sanitary napkin. As the material for forming the topsheet 11, a conventionally used material such as a nonwoven fabric or an apertured film can be used without any particular limitation. it can. The first
As the material for forming the back sheet 12a and the second back sheet 12b, conventionally used materials such as a leak-proof film, polyethylene-laminated waterproof paper, and polyethylene-laminated non-woven fabric can be used without any particular limitation. Further, the heat-welded portions 14, 14 can be provided by using the conventional technique without any particular limitation, and the hot-melt agents 15, 15 which are conventionally used can be used without any particular limitation. The adhesive section 16 can also be provided by using a conventional adhesive without any particular limitation and using a conventional technique without any particular limitation.

Thus, the sanitary napkin 1 of the present embodiment is provided with a raised portion 13a, which is protruded toward the skin contact surface side and extends in the longitudinal direction of the sanitary napkin 1, at the rear of the absorber 13. And the absorber 13 corresponding to the raised portion 13a
A non-skin contact surface side has a rear groove 18 extending in the longitudinal direction of the sanitary napkin 1 at the center in the width direction of the sanitary napkin 1.

More specifically, in the sanitary napkin 1 of the present embodiment, the raised portion 13a of the absorber 13 is
As shown in FIG. 1, it is formed at the rear part of the absorber 13 and is elongated from the vicinity of the center part to the vicinity of the rear end part, and becomes gradually thicker toward the rear. The raised portion 13a
In order to obtain excellent leakproofness and is favorably contact without discomfort to the body fluid excretion portion of the wearer the raised portion 13a has a width W ₁ in the central portion near is 5 to 40 mm, the rear end portion width W ₂ in is preferably 10 to 70 mm.
In the sanitary napkin 1 shown in FIG.
a is wider as it goes to the rear part of the sanitary napkin 1 in consideration of the rearward deviation when the sanitary napkin 1 is put on the shorts of the wearer. W1 is ₅ to 40 mm, more preferably width W1 is ₁₀ to 3
If it is in the range of 0 mm, a rectangular shape in plan view can be preferably used.

The absorber 13 has a capacity of 2.5 g / cm.^TwoWeight
The thickness T of the portion where the raised portion 13a is formed below
₁Is 7 mm and the portion where the raised portion 13a is not formed is
Thickness T_TwoIs 4 mm, and the height of the protrusion 13a is
S (difference between the raised portion 13a and a portion other than the raised portion 13a) T
_ThreeIs 3 mm. The raised portion 13a is formed
2.5g / cm^TwoThickness T under load ₁Is 3
１５15 mm, preferably 5１２12 mm
Is more preferable. If it is less than 3 mm, it is preferable for the buttocks.
It is not preferable because it cannot provide
On the contrary, it becomes too thick and it makes the buttocks uncomfortable
Not good. The protrusion 13a of the absorber 13 is formed.
2.5g / cm of the missing part^TwoThickness T under load_TwoIs
It is preferably 1 to 10 mm, and 2 to 7 mm
Is more preferable. If it is less than 1 mm, the rigidity is too small
The side edge is easy to be twisted, and if it exceeds 10 mm, the rigidity increases.
Too thick or the sanitary napkin 1 becomes too thick
Therefore, a feeling of strangeness at the time of wearing is increased. Ridge 13a
2.5g / cm^TwoHeight T under load_ThreeIs attached
Fits well on the buttocks of the elderly and has excellent leakage prevention
Is preferably 2 to 10 mm, and 2 to 7 mm
Is more preferable.

The material constituting the absorber 13 is as follows.
Conventionally known materials constituting the absorber, such as fluff pulp, absorbent paper, and highly absorbent polymer, can be used without any particular limitation. However, the material of the rear groove 18 of the raised portion 13a of the absorber 13 can be used. The bending stiffness in the width direction (the bending stiffness such that the cross section in the length direction is held linearly) of the portion not provided to the non-skin contact surface side is 1 to 10 gf.
-What is cm / 3cm is preferable. Flexural rigidity is 1g
At f · cm / 3 cm, the absorber at the raised portion is too soft and distorted, and when it exceeds 10 gf · cm / 3 cm, the rigidity is too high, giving an uncomfortable feeling.

The bending stiffness of the sample (thickness similar to that of the raised portion 13a) is 30 mm in the longitudinal direction (longitudinal direction of the sanitary napkin 1) and 70 mm in the width direction (width direction of the sanitary napkin 1). Absorber without the rear groove 18)
Is held by chucks at 1 cm intervals using a pure bending tester manufactured by Kato Tech Co., Ltd., and the curvature is K = −
Deformation rate 0.5 in the range of 2.5 to +2.5 (cm ^-1 )
A bending moment M is measured by performing a pure bending at a constant velocity curvature of 0 (cm ⁻¹ ) / sec, and the bending moment per sample length unit (M) −curvature (K = 0.5 to 1.5) K)
The bending stiffness per unit area (B), which is the slope of the curve, is obtained.

As shown in FIGS. 1 and 4, the rear groove 18 is linear and functions as a flexible shaft at the rear of the absorbing portion 13 when the sanitary napkin 1 is mounted. The center in the width direction of the rear portion 1 is easily deformed into an inverted V-shape so that it fits well on the buttocks of the wearer.

The bending stiffness in the length direction of the absorbent body 13 toward the non-skin contact surface at the portion where the rear groove 18 is provided is 0.2 to 2 gf · cm. That is, the bending stiffness of the portion where the rear groove 18 is not provided at the center in the width direction of the rear portion is 1.5 times or more the bending stiffness in the width direction of the portion where the rear groove 18 is provided. And more preferably 2 to 10 times. When the bending rigidity ratio is less than 1.5,
This is because it is difficult to take a desirable mounting form that fits on the buttocks at the time of mounting, because the flexible shaft portion does not actively bend. In addition, the said rear groove 1 which functions as a flexible shaft
The bending rigidity of the portion provided with 8 has the same thickness as that of the raised portion 13a whose longitudinal direction (longitudinal direction of the sanitary napkin 1) is 30 mm and width direction (width direction of the sanitary napkin 1) is 70 mm. When the same groove processing as the rear groove 18 was performed on the non-skin contact surface side of the body as a sample,
The bending stiffness per unit area (B), which is the slope of the bending moment (M) -curvature (K) curve per unit of length of the sample, was determined. The depth of the rear groove 18 is preferably 0.5 to 10 mm, and 1 to 5 mm.
Is more preferable. The depth of the rear groove 18 is 0.5 m
If it is less than m, it is difficult to obtain flexibility at the groove portion, and it is difficult to obtain a preferable fit. If it exceeds 10 mm, the groove portion becomes too high in density and the thickness of the raised portion is undesirably reduced. Further, the depth D ₁ (see FIG. 2) of the rear groove 18 is 0.5 to 10 mm, and the depth D ₁ of the rear groove with respect to the thickness T ₁ of the portion of the absorber where the raised portion 3a is formed. ₁ ratio (D ₁ / T ₁₎ is preferably from 0.05 to 0.7, the depth D ₁ is 1 to 5 mm, the ratio (D ₁ / T ₁₎ is 0.1 More preferably, it is 0.5. When the depth D ₁ of the rear groove 18 is less than 0.5 mm and the ratio (D ₁ / T ₁ ) is less than 0.05, it is difficult to obtain flexibility in the rear groove portion, and it is difficult to obtain a preferable fitting property. On the contrary, if the depth D ₁ exceeds 10 mm and the ratio (D ₁ / T ₁ ) exceeds 0.7, the groove portion is compressed at a high density, and the thickness of the entire raised portion decreases. Not preferred.

On the non-skin contact surface side of the absorber 13, the second back sheet 12b is disposed in a planar shape.
The first back sheet 12a is arranged in a plane on the non-skin contact surface side of the back sheet 12b. The back sheets 12a and 12b are not grooved along the rear groove 18 of the absorber 13.

The napkin body 10 of the sanitary napkin 1 of this embodiment has a pair of front and rear symmetrical napkins 1 formed by embossing the topsheet 11 and the absorber 13 together from the skin contact surface side. Grooves 19, 19 are provided. The front grooves 19, 19 are formed on the surface of the absorbent body 13 on the skin contact surface side.
Along the outer side of the side edge of the raised portion 13a, a convex arc shape is formed toward the inside in the width direction of the sanitary napkin 1 in a plan view. It is easily deformed as a flexible shaft, and when mounted, the raised portion 1
3a is deformed into a cross-sectional arch shape protruding toward the wearer so that the outer sides in the width direction of the front grooves 19, 19 are arranged in a substantially horizontal direction without being distorted, and the bodily fluid that has migrated to the outer side of the raised portion 13a is dammed. The stop is moved to the rear to prevent leakage from the side edge portion of the sanitary napkin 1 in a favorable manner.

The front grooves 19, 19 are connected to the front grooves 19, 1 respectively.
9 has a depth D ₂ (see FIG. 2) of 0.5 to 9 mm and a ratio D to a thickness T _{2 of} a portion where no groove is formed.
Preferably, ₂ / T ₂ is 0.3 to 0.9, more preferably D ₂ is 1 to 6 mm, and D ₂ / T ₂ is 0.1 to 0.9 mm.
5 to 0.9. The depth of the surface grooves 19, 19 is 0.5 mm
If it is less than 10 mm, it is difficult to obtain flexibility in the groove portion, it is difficult to obtain a favorable fit, or it is difficult to obtain the effect of blocking bodily fluid flowing on the surface, which is not preferable.

A preferred groove structure of the rear groove 18 and the front grooves 19 will be described below. Here, a preferred structure of the rear groove 18 will be described in detail.
The same applies to No. 9 unless otherwise specified. As shown in FIG. 3 and FIG. 4, the rear groove 18 is formed by discontinuously forming a plurality of diamond-shaped small grooves 18a along a predetermined shape from the skin contact surface side. 18
It is formed in two steps of depths in which the space between the points a is continuously recessed from the surface on the skin contact surface side. As described above, the gap between the small grooves 18a and between the small grooves 18a is continuously depressed from the surface on the skin contact surface side to form two stages of depth. And a good fit can be obtained. The size of the small groove 18a is 1 to
It is preferably 100 mm ² . If it is smaller than 1 mm ² , the compression area is too small to obtain the desired flexibility, and if it exceeds 100 mm ² , the desired flexibility cannot be obtained. The pitch of each small groove 18a is preferably 0.5 to 5 mm. If it is less than 0.5 mm, favorable flexibility and skin contact properties cannot be obtained, and if it exceeds 5 mm, a portion that does not become concave is formed between the small grooves 18 a, and it bends strangely not only in the width direction but also in the longitudinal direction and smoothly. Will not fit. In the front groove 19, the effect of preventing leakage is reduced.

By forming the rear groove 18 and the front grooves 19, 19 between the small grooves 18a and the small grooves 18a continuously so as to be depressed from the surface on the skin contact surface side to form two levels of depth. If provided, their depth is the depth in the small groove 18a.

As shown in FIG. 5, the sanitary napkin 1 of this embodiment has a central portion disposed between the groins, and is attached with the adhesive portion 16 adhered to the undergarment W, as in a normal sanitary napkin. In the sanitary napkin 1 of this embodiment mounted in this manner, the absorber 13 is easily deformed with the front grooves 19, 19 as flexible shafts, and a lateral force is applied to the central portion from the side. Is added, the space between the front grooves 19 is raised in an arch-like manner, so that the front grooves 19 are brought into good contact with the wearer's crotch. In addition, absorber 1
The third raised portion 13a is easily deformed easily using the rear groove 18 as a flexible axis, and when attached, is bent in the rear groove 18 as shown in FIG. It gently rises to the side and makes good contact with the wearer's buttocks. Therefore, the body fluid does not leak out of the absorbent article 1 through the body. The shape of the sanitary napkin 1 at the time of mounting is guided and formed by the rear groove 18 and the front grooves 19, 19, so that the shape is maintained well regardless of the mounting state.

As described above, the sanitary napkin 1 of the present embodiment is
According to this, a raised portion 13a is provided at a rear portion of the absorber 13, and the raised portion 13a is kept low in bending rigidity by a rear groove 18, so that the raised portion 13a is convex toward the skin contact surface side at the time of mounting. Bent in a reverse V-shape in cross section and satisfactorily abuts the buttocks of the wearer, exhibiting good fit and preventing leakage. Further, according to the sanitary napkin 1 of the present embodiment, the absorber 13 is formed by the front grooves 19, 19.
9 and 19 can be easily deformed as flexible shafts, so that the outer edges 19 and 19 are protruded in an arch-like manner during mounting, and the abutment between the outer grooves 19 and 19 is favorably brought into contact with the wearer's crotch. ,Also,
Since the body fluid that moves in the width direction is blocked and moved rearward, leakage from the side edge portion of the sanitary napkin 1 is properly prevented. According to the sanitary napkin 1 of the present embodiment, since the back sheets 12a and 12b are arranged in a planar shape and are not subjected to the groove processing along the rear groove 18 of the absorber 13, both back sheets 12a and 12b are formed. Does not bend easily,
It can be firmly fixed to the shorts, and there is no possibility that the adhesive portions 16 adhere to each other during mounting operation or during mounting and are not distorted. Thereby, a good fit is obtained and leakage is well avoided.

In the sanitary napkin 1 of the present embodiment, a continuous body of the absorbent body 13 having a thickness of 7 mm and a basis weight of 300 g / m ² is subjected to a compression (heating compression if necessary) process by an embossing roll or the like to thereby form a raised portion. 13a and the rear groove 18 are formed. Thereafter, the continuous band of the second back sheet 12b is covered from the non-skin contact surface side, and the continuous band of the top sheet 11 is covered on the skin contact surface side. Front groove 1 from the continuous band side of sheet 11
9 and 19, the non-skin contact surface side is covered with a continuum of the first back sheet 12a, the peripheral edge is fixed, and the sheet is cut into a predetermined shape.

The absorbent article of the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention. For example, in addition to the above-described shape, the shape of the raised portion 13a may be an inverted V-shape or the like in which both side edges are straight, and the width becomes wider toward the rear. Further, the rear groove 18 and the front grooves 19, 19 are not limited to those that are continuous from the front end to the rear end as in the above-described embodiment, but are formed discontinuously at a plurality of locations in the longitudinal direction. You can also. Further, the rear groove 18 and the front grooves 19, 19 may not be formed by connecting the small grooves 18a as described above, but may be formed by continuous groove processing. Further, when formed by a plurality of discontinuous small grooves 18a divided in the longitudinal direction as in the above-described embodiment, the shape of the small grooves 18a is not particularly limited.

The protruding portion 13a is formed by embossing the absorber 13 having a uniform thickness as described above, and is formed on a part of the absorber 13b 'having a uniform thickness as shown in FIG. The protrusion 13a 'may be formed by stacking the absorbers 13a', or may be formed into a shape having the protrusion 13a from the beginning. When a ridge is formed by overlapping another absorber 13a 'on the absorber 13b' as shown in FIG. 6, the rear groove 18 is formed as shown in FIG. It may be formed on the surface on the non-skin contact surface side of the body 13b ', but may be formed on the non-skin contact surface side of the absorber 13a' as shown in FIG. This aspect is also one embodiment of the present invention. The same effect can be obtained even if the second back sheet 12b is arranged along the rear groove 18 and only the first back sheet 12a is arranged in a plane. The absorbent article may be a sanitary napkin, a pad for incontinent persons, a vaginal sheet, or the like.

[0030]

As described above, according to the absorbent article of the present invention, since the raised portion is kept low in bending rigidity by the rear groove, the raised portion can be applied to the skin at the time of mounting. It is bent in a reverse V-shape in cross section, which is convex on the contact surface side, and satisfactorily abuts on the buttocks of the wearer, thereby exhibiting good fit and preventing leakage.

Also, since the back sheet is arranged in a flat shape, it can be easily attached without sticking between the adhesive portions during the attaching operation or during attaching, and it is hard to be twisted and a good fitting property is exhibited so that leakage occurs. Is well avoided.

According to the absorbent article according to the fourth aspect, since the absorber front groove is easily deformed using the flexible shaft as a flexible shaft, the side edges are not distorted and the space between the front grooves is arched. Since the body fluid rises up and makes good contact with the crotch of the wearer, and the body fluid that migrates in the width direction is blocked and migrated rearward, leakage from the side edge of the absorbent article is prevented well. .

[Brief description of the drawings]

FIG. 1 is a plan view showing a sanitary napkin as one embodiment of an absorbent article of the present invention as viewed from a skin contact surface side.

FIG. 2 is a cross-sectional view of the sanitary napkin taken along a line II of FIG.

FIG. 3 is an enlarged plan view of the absorbent body of the sanitary napkin of FIG. 1 as viewed from a non-skin contact surface side.

FIG. 4 is a sectional view taken along line KK of the absorbent body of the sanitary napkin of FIG.

FIG. 5 is a cross-sectional view showing the sanitary napkin of FIG. 1 in a mounted state.

FIG. 6 is a cross-sectional view showing an absorbent body according to another embodiment of the absorbent article of the present invention.

FIG. 7 is a cross-sectional view showing an absorbent body according to still another embodiment of the absorbent article of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sanitary napkin (absorbent article) 10 Napkin main body 11 Top sheet 12 Back sheet 13 Absorber (absorbing part) 13a Raised part 14 Heat welding part 15 Hot melt agent 16 Adhesive part 17 Back groove 18 Back groove 19 Front groove 20 Wing P liquid permeable layer I liquid impermeable layer A absorption part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Minoru Nakanishi 2606 Akabane, Kakaicho, Haga-gun, Tochigi Pref.

Claims (4)

[Claims] 1. A liquid permeable layer on a skin contact surface side, a liquid impermeable layer on a non-skin contact surface side, and an absorbing portion interposed between the liquid permeable layer and the liquid impermeable layer. An absorbent article formed substantially vertically elongated, comprising, at a rear portion of the absorbent portion, a raised portion protruding to the skin contact surface side and extending in the longitudinal direction of the absorbent article, The non-skin contact surface side of the corresponding absorbent portion has a rear groove extending in the longitudinal direction of the absorbent article at the center in the width direction of the absorbent article, and the liquid impermeable layer is liquid impermeable. An absorbent article, comprising: a back sheet according to any one of claims 1 to 3, wherein the back sheet is arranged in a planar shape, and is not subjected to groove processing along the rear groove of the absorbing section. ^2. A thickness of the absorbing portion at a central portion in a width direction of the rear portion under a load of 2.5 g / cm ² of 3 to 20 mm.
2. The absorbent article according to claim 1, wherein the height of the protrusion is 2 to 15 mm. 3. A flexural rigidity in a width direction of a portion where the rear groove is not provided at a center portion in a width direction of the rear portion of the absorbing portion toward a non-skin contact surface side is 1 to 10 gf · cm. The bending rigidity in the width direction toward the non-skin contact surface side of the portion where the rear groove of the rear portion of the absorbing portion is provided is 0.2 to 2 gf · cm, and the width direction central portion of the rear portion is 3. The absorptive material according to claim 1, wherein a ratio of a bending rigidity in a width direction of a portion where the rear groove is not provided to a portion where the rear groove is provided is 1.5 or more. Goods. 4. A pair of front grooves extending in a longitudinal direction of the absorbent article on both sides of a central portion of the absorbent article on a surface of the absorbent section on a skin contact surface side. The absorbent article according to any one of claims 1 to 3, wherein