JP7279285B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles with apertured films.

In general, absorbent articles such as light incontinence pads, pants-type paper diapers, and tape-fastened paper diapers are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets. , consists of As a result, body fluids such as urine pass through the top sheet and are absorbed by the absorbent member, and are prevented from leaking to the outside by the back sheet. Such absorbent articles have been devised in various ways in order to improve absorbency of bodily fluids, improve wearer's wearing comfort, prevent leakage, and the like.

For example, there is a technique for improving absorbent performance such as wet back and absorption speed by providing a perforated film at a predetermined position of an absorbent article. By making the opening area of the skin side of the perforated film larger than that of the non-skin side, wetback and absorption rate are improved.

As an absorbent article using a perforated film, for example, Patent Document 1 discloses an absorbent article having a liquid-permeable surface material, a liquid-retaining absorbent material, and a liquid-impermeable leakage preventive material, The surface material consists of a liquid-permeable sheet obtained by laminating and integrating a skin-contacting surface layer and a non-skin-contacting surface layer, and the skin-contacting surface layer consists of a perforated film made of a thermoplastic resin or a synthetic fiber. Absorbent articles formed from nonwovens are disclosed.

In addition, Patent Document 2 has a surface layer, an absorbent layer, and a bottom layer, which are provided in order from top to bottom, and the absorbent layer includes, from top to bottom, a perforated film layer, a core layer, and an underadhesive layer. , wherein the perforated film layer is positioned between the surface layer and the core layer, and the subbing layer is positioned between the core layer and the bottom layer.

Furthermore, Patent Document 3 discloses an absorbent body having an absorbent layer containing at least one of SAP and fluff pulp as an absorbent component, wherein the absorbent body is arranged in contact with the absorbent layer and is water resistant. The absorber covering layer is made of a perforated film made of a highly breathable synthetic resin. The perforated film had a large number of funnel-shaped projections with small perforations at the top and large perforations at the bottom, and the tops of the projections were arranged so as to be in contact with the absorbent layer. An absorbent article is disclosed.

JP-A-8-66425 Utility Model Registration No. 3215515 JP-A-2002-355271

However, in the absorbent articles and the urine absorbing pads of Patent Documents 1 and 2, which are provided with the porous film, both are excellent in preventing liquid backflow such as wet back and in absorption rate, but liquid in the absorbent article It cannot be said that there is an effect on the diffusibility of the absorbent, and the absorption performance of the absorbent cannot be sufficiently exhibited.

Moreover, the absorber described in Patent Document 3 uses a perforated film whose opening area on the skin side surface is smaller than that on the conventional non-skin side surface, and is configured such that the surface with the smaller opening area is in contact with the absorber. However, even in this case, there is no technical idea of improving the diffusibility of the liquid.

As in the above-mentioned patent documents, there are cases in which perforated films are used as surface materials on the liquid receiving side of sanitary napkins and disposable diapers. is improved. However, although apertured films are often more expensive than ordinary nonwovens, they are insufficient to exhibit more beneficial liquid permeability and anti-backflow properties. In addition, since the perforated film is a resin film, it feels hard to the touch.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorbent article with improved diffusibility and liquid permeability, and improved liquid backflow prevention properties.

As a result of intensive studies, the present inventors have found that the above problems can be solved by providing a perforated film having a specific configuration between the top sheet and the absorbent body, and have arrived at the present invention. An absorbent article comprising a permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet, wherein the topsheet and the absorbent body are A perforated film having a plurality of truncated cone-shaped perforations between them is provided, the perforated film is composed of a central portion and both end portions along the longitudinal direction, and on the surface of the perforated film on the top sheet side , the opening diameter of the openings in the central portion is smaller than the opening diameter of the openings in the both end portions, and the opening diameters of the openings in the central portion on the surface on the side of the top sheet are larger than the diameters of the openings on the side of the back sheet. and the openings on the both ends have a diameter on the surface on the side of the top sheet larger than a diameter on the surface on the side of the back sheet.

The plurality of truncated conical openings have an opening diameter of 2 mm or less, a number of openings of 50/cm ² or more, and a basis weight of 20 g/m ² or more and 60 g/m ² or less. preferable.

The absolute value of the difference between the pore diameter on the top sheet side surface and the pore diameter on the back sheet side surface is 0.03 mm or more and 0.15 mm or less in each of the central portion and the both end portions. preferable.

A liquid-diffusing second sheet is preferably provided between the top sheet and the perforated film.

The basis weight of the second sheet is preferably 10 g/m ² or more and 60 g/m ² or less.

According to the present invention, it is possible to provide an absorbent article with improved diffusibility and liquid permeability, and improved liquid backflow prevention properties.

1 is a plan view of an absorbent article of the present invention; FIG. 2 is a cross-sectional view taken along line X1-X1 in FIG. 1; FIG. 1 is a plan view of an apertured film in the present invention; FIG. 4 is a cross-sectional view taken along line X2-X2 in FIG. 3; FIG.

Modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail below with reference to the accompanying drawings, but these are given for the purpose of illustration and are not intended to limit the present invention. do not have. In addition, the same code|symbol is attached|subjected to the same element through the whole description of embodiment.

Moreover, in the description of this specification, when the absorbent article 10 is worn means at least one of when the absorbent article 10 is worn and after the absorbent article 10 is worn. The longitudinal direction of the absorbent article 10 is the direction that spans the front and back of the wearer when the absorbent article 10 is worn, and is the direction indicated by symbol Y in the drawing. Moreover, the width direction of the absorbent article 10 is a direction that is transverse or perpendicular to the longitudinal direction, and is the direction indicated by symbol X in the drawing. Furthermore, the skin-contacting surface is the surface of the front and back surfaces of each member such as an absorbent body, which is arranged on the wearer's skin side when worn, and the non-skin-contacting surface is each member such as an absorbent body. Of the front and back sides of the , the side facing away from the wearer's skin when worn. Body fluids refer to liquids excreted from the body to the outside of the body, such as urine, blood, and water in loose stools. Further, examples of the absorbent article 10 include, but are not limited to, light incontinence pads, pants-type paper diapers, and tape-fastened paper diapers, regardless of whether they are for babies or adults. There may be.

[Absorbent article]
FIG. 1 is a plan view of an absorbent article 10 according to an embodiment of the present invention, viewed from the top sheet 20 side. As shown in FIG. 1, the absorbent article 10 of this embodiment includes a liquid-permeable topsheet 20 arranged on the skin-contacting side and a non-skin-contacting side facing the topsheet 20. and an absorbent body 40 arranged between the top sheet 20 and the back sheet 30 . Furthermore, as shown in FIG. 2, the absorbent article 10 includes a second sheet 50 of a liquid-diffusing sheet and a perforated film 70 having a plurality of perforations between the top sheet 20 and the absorbent body 40 .

It is preferable that the dimension _L10 in the longitudinal direction Y of the absorbent article 10 is 100 mm or more and 800 mm or less, and the dimension _W10 in the width direction X is 50 mm or more and 500 mm or less. By adjusting the dimensions of the absorbent article 10 within the above range, the absorbent article 10 suitable for light incontinence pads, pants-type disposable diapers, tape-fastened disposable diapers, and the like can be obtained.

(top sheet)
The top sheet 20 may be formed from a liquid-permeable base material that allows bodily fluids to move to the absorbent body 40 . Examples of liquid-permeable substrates include nonwoven fabrics such as air-through nonwoven fabrics, thermal bonded nonwoven fabrics, spunbond nonwoven fabrics, composite nonwoven fabrics laminated with thermal bond/spunbond, foamed films such as urethane foam, or laminated films of these. A composite sheet is mentioned.
In addition, the top sheet 20 may be embossed or perforated on the surface in order to improve liquid permeability. As a method for applying these embossing and perforating processes, known methods can be implemented without limitation. In order to reduce irritation to the skin, the top sheet 20 may contain a lotion, an antioxidant, an anti-inflammatory ingredient, a pH adjuster, an antibacterial agent, a moisturizing agent, and the like.
The basis weight of the top sheet 20 is preferably 18 g/m ² or more and 40 g/m ^{2 or} less in terms of strength, processability, and liquid return amount. The top sheet 20 may have any shape as long as it covers the absorbent body 40 in order to guide bodily fluids to the absorbent body 40 without leakage.

(back seat)
The back sheet 30 may be a base material having liquid impermeability such that body fluid retained by the absorbent body 40 does not wet the clothes, and may be a resin film or a composite sheet obtained by laminating a resin film and a nonwoven fabric. formed from material. The nonwoven fabric used for the composite sheet is not particularly limited in manufacturing method, and examples thereof include spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond/meltblown, spunbond/meltblown/spunbond laminated composite nonwoven fabrics, and composite materials thereof. mentioned. Examples of resin films include polyester, polyvinyl alcohol, polyethylene, polypropylene, composite films of polyethylene and polypropylene, and the like.

From the viewpoint of strength and workability, the basis weight of the backsheet 30 is preferably 15 g/m ² or more and 60 g/m ² or less. In addition, it is preferable that the back sheet 30 has air permeability in order to prevent stuffiness during wearing. In order to make the back sheet 30 air-permeable, for example, a filler may be added to the base resin film, or the back sheet 30 may be embossed. Calcium carbonate can be used as a filler, and a known method can be used without limitation as a method for blending the filler.

(Perforated film)
In the present invention, an apertured film 70 having a plurality of truncated conical apertures is provided between the top sheet 20 and the absorbent body 40 .
The perforated film 70 preferably has liquid permeability and liquid diffusibility such that bodily fluids move to the absorbent body 40 .
The perforated film 70 preferably has a perforation diameter of 2 mm or less, more preferably 0.50 mm or more and 0.65 mm or less, in terms of liquid diffusion.
Here, the "aperture diameter" is the average value obtained by photographing the perforated film 70 with a 3D microscope (VR-3100) manufactured by Keyence Corporation and measuring the diameters of three arbitrarily selected apertures.
Moreover, "the pore diameter is 2 mm or less" means that the pore diameters of the top sheet 20 side surface 71 and the back sheet 30 side surface 72 of the perforated film 70 are both 2 mm or less.
In terms of liquid permeability, the number of openings is preferably 50/cm ² or more and 200/cm ² or less. Furthermore, from the viewpoint of strength and workability, the perforated film 70 preferably has a basis weight of 20 g/m ² or more and 60 g/m ² or less, more preferably 23 g/m ² or more and 30 g/m ² or less. preferable.
By setting the pore size, the number of pores, and the basis weight of the porous film 70 within the above ranges, the porous film 70 having excellent strength, workability, liquid permeability, and liquid diffusibility can be obtained.

The material of the perforated film 70 is preferably polyethylene or polypropylene, and polyethylene is particularly preferable from the viewpoint of softness.

As shown in FIG. 3, the perforated film 70 is composed of a central portion B and both end portions A and C along the longitudinal direction Y. As shown in FIG. The center portion indicates an area of 10% or more and 90% or less including the center in the width direction X, and both end portions indicate the left side area and the right side area of the width direction X of the center part. The aperture diameter in the central part is the average value obtained by measuring the diameter of any three apertures in the range near the central part, and the aperture diameter at both ends is the diameter of any three apertures in the range near both ends. is the average value of the measured diameters.
On the surface 71 of the perforated film 70 on the top sheet 20 side, the aperture diameter _Db1 of the aperture 74 in the central portion B is smaller than the aperture diameters _Da1 and _Dc1 of the apertures 73 and 75 in the both end portions A and C. The opening diameters D _a1 and D _c1 of the openings 73 and 75 at both ends A and C are preferably substantially the same size.
In the openings 74 in the central portion B, the opening diameter _Db1 on the surface 71 on the top sheet 20 side is smaller than the opening diameter _Db2 on the surface 72 on the backsheet 30 side, and the openings 73 on both ends A and C 75, the pore diameters D _a1 and D _c1 on the surface 71 on the top sheet 20 side are larger than the pore diameters D _a2 and D _c2 on the surface 72 on the back sheet 30 side.
On the surface of the perforated film 70 on the top sheet 20 side, the hole diameter D _b1 of the hole 74 at the central portion B is smaller than the hole diameters D _a1 and D _c1 of the holes 73 and 75 at both ends A and C. , it has a good texture and is excellent in diffusion speed and absorption speed of body fluids such as urine in the lateral direction, so that side leakage hardly occurs. In addition, since the opening diameters D _a2 and D _c2 of the surface 72 on the back sheet 30 side of both ends A and C are smaller than the opening diameters D _a1 and D _c1 on the surface 71 on the top sheet 20 side, the liquid is difficult to return.

As shown in FIG. 4, in the central portion B of the perforated film 70, the absolute value of the difference between the perforation diameter D _b1 on the surface 71 on the top sheet 20 side and the perforation diameter D _b2 on the surface 72 on the back sheet 30 side is It is preferably 0.03 mm or more and 0.15 mm or less.
Similarly, at both ends A and C, the absolute values of the differences between the hole diameters D _a1 and D _c1 on the surface 71 on the top sheet 20 side and the hole diameters D _a2 and D _c2 on the surface 72 on the back sheet 30 side are , 0.03 mm or more and 0.15 mm or less.
By setting the difference between the pore diameter of the surface 71 on the top sheet 20 side and the pore diameter of the surface 72 on the back sheet 30 side to the above range, the surface feels good on the skin and body fluids such as urine quickly spread and absorb in the lateral direction. Therefore, side leakage can be prevented, and liquid return can be prevented.
The perforated film 70 in the present invention can be produced by perforating a material such as a film having no perforations by embossing to perforate the perforations.

(Absorber)
In the absorbent article 10 of the present invention, as shown in FIG. 1, the longest width dimension _L40 in the longitudinal direction Y of the absorbent body 40 is preferably 100 mm or more and 800 mm or less, and more preferably 150 mm or more and 500 mm or less. more preferred. In addition, the longest dimension _W40 in the width direction of the absorbent body 40 is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less. In addition, as shown in FIG. 2, the absorbent body 40 in the absorbent article of the present embodiment consists of an upper absorbent body 41 positioned on the skin contact side and a lower absorbent body 42 positioned on the non-skin contact side. However, a carrier sheet 60 may be arranged between the upper layer absorbent body 41 and the lower layer absorbent body 42 to form a three layer structure.

－Absorbent fiber－
The absorbent body 40 contains absorbent fibers as a base material and a superabsorbent polymer (SAP).
Absorbent fibers may be those generally used in absorbent articles such as sanitary napkins, paper diapers, and incontinence pads. can be mentioned. Among these, fluff pulp is preferably used from the viewpoint of absorbability. Examples of fluff pulp include wood pulp (for example, bleached softwood kraft pulp (N-BKP) such as southern pine and Douglas fir), synthetic fiber, resin fiber, non-wood pulp, etc., which are defibrated into cotton. can. When fluff pulp is used as the absorbent fiber as the base material of the absorbent body 40, the basis weight of the absorbent fiber is preferably 100 g/m ² or more and 800 g/m ² or less, and 325 g/m ² or more and 615 g. /m ² or less is more preferable. As a result, more bodily fluids can be absorbed without impairing the feel of the skin.

－Super Absorbent Polymer－
As the superabsorbent polymer of the absorbent body 40, any polymer can be used as long as it can absorb bodily fluids and prevent backflow, such as sodium polyacrylate, polyaspartate, and (starch-acrylic acid) graft copolymer. , (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified products thereof. Among these, the sodium polyacrylate type is preferable from the viewpoint of the absorption amount per weight.

The basis weight of SAP contained in the absorbent body 40 is preferably 240 g/m ² or more and 450 g/m ² or less, more preferably 245 g/m ² or more and 445 g/m ² or less. Within the above numerical range, gel blocking in the absorbent body 40 can be prevented, and a large amount of body fluid can be absorbed in the absorbent body 40 .
In addition, in the absorbent body 40, the ratio of the weight of the superabsorbent polymer to the weight of the fluff pulp, that is, the weight of the superabsorbent polymer/the weight of the fluff pulp×100 (%) is 40% or more and 120% or less. , and more preferably 50% or more and 100% or less.

In the absorbent body 40, the absorbent fibers and the SAP may be formed by mixing SAP particles in the absorbent fibers, or may be an SAP sheet in which the SAP particles are fixed between the absorbent fibers. Further, the absorbent body 40 may be wrapped in a carrier sheet 60 for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorbent body 40 . The base material of the carrier sheet 60 may be any material as long as it is hydrophilic, and examples thereof include hydrophilic nonwoven fabric such as tissue, absorbent paper, and air-laid nonwoven fabric. When a plurality of carrier sheets 60 are provided, the substrates of the plurality of carrier sheets 60 may be the same or different.

(Liquid diffusible second sheet)
As shown in FIG. 2, between the top sheet 20 and the perforated film 70, the liquid diffusion property of the absorbent article 10 is improved, the hardness of the perforated film 70 is suppressed, and the texture is improved. Therefore, it is preferable to dispose the liquid-diffusing second sheet 50 . The base material of the second sheet 50 may be any material that has a faster permeation rate of body fluids than the top sheet 20 and diffuses the body fluids into the absorbent body 40 quickly. The second sheet 50 preferably has a thickness of 0.1 mm or more, and a basis weight of 10 g/m ² or more and 60 g/m ² or less, more preferably 15 g/m ² or more and 40 g/m ² or less. If the thickness is less than 0.1 mm, or the basis weight is less than 10 g/m ² or greater than 60 g/m ² , the liquid will not sufficiently diffuse over the entire upper surface of the absorbent body 40 . The shape of the second sheet 50 is not particularly limited, but preferably has a shape that can completely cover the surface of the absorbent body 40 so that bodily fluids are diffused all over the absorbent body 40 .

(Three-dimensional gather)
As shown in FIG. 2, in the absorbent article 10, an elastic member for three-dimensional gathers is provided on the top sheet 20 along the longitudinal direction of the absorbent article 10 in order to prevent lateral leakage of body fluid excreted by the user. A pair of solid gathers 80 having The outer ends of the three-dimensional gathers 80 in the width direction of the absorbent article 10 are fixed to the back sheet, the inner ends are fixed to the top sheet 20, and the center is a free end that is not fixed to the top sheet 20. Gathered sheets are provided. By providing the three-dimensional gathers elastic member along the longitudinal direction, the three-dimensional gathers 80 can stand upright and can be deformed according to the body shape of the wearer. As the three-dimensional gather elastic member, for example, a polyurethane thread, a band-like polyurethane film, a thread-like or band-like natural rubber, or the like is used. Nonwoven fabrics such as spunbonded nonwoven fabrics, meltblown nonwoven fabrics, spunbond/meltblown/spunbond laminated composite nonwoven fabrics, and the like are used.

Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments and examples. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. It should be noted that the present invention is by no means limited to the examples shown below.

[Example 1]
(Production of absorbent article)
In the absorbent body, one formed by mixing 7 g of fluff pulp as a base material with 6 g of SAP is used, and as the top sheet, an air-through nonwoven fabric (basis weight: 25 g/m ² ) is used, and liquid-impermeable. A breathable polyethylene sheet (basis weight: 32 g/m ² ) is used as the back sheet, an air-through nonwoven fabric (basis weight: 30 g/m ² ) is used as the second sheet, and a spunbond/meltblown/spunbond laminated composite nonwoven fabric ( A basis weight of 15 g/m ² ) and upper and lower carrier sheets were used.
In addition, three sheets of perforated film having a basis weight of 26 g/m ² were cut into a lengthwise dimension of 273 mm and a widthwise dimension of 35 mm. The second sheet was arranged so that the side with the smaller opening diameter was in contact with the second sheet. The dimensions of the absorbent article were 273 mm in the longitudinal direction and 105 mm in width, and the dimensions of the absorbent body were 220 mm in the longitudinal direction and 71 mm in width.

[Comparative Example 1]
An absorbent article was produced in the same manner as in Examples, except that the perforated film was not used.

[Comparative Example 2]
An absorbent article was produced in the same manner as in Example except that a perforated film (basis weight: 26 g/m ² ) was placed under the second sheet and the side with the larger aperture diameter was placed on the second sheet side.

[evaluation]
The examples and comparative examples were evaluated as follows. Table 1 shows the evaluation results.
(Skin feel of absorbent article surface)
Eight panelists evaluated the feel of the surface of the absorbent article. When the number of evaluators who touched the surface of the absorbent article and "felt the surface was soft" was 6 or more and 8 or less, "○" was given, and when the evaluators who "felt the surface was soft" were 3 or more and 5 or less "Fair", when one or two evaluators "felt the surface was soft", or when there was no evaluator "felt the surface soft" was rated "x".

(Absorption speed 3 times method)
A measuring jig having a hole with an inner diameter of ¹⁹ mm and a weight of 755.6 g was placed on the central part of the absorbent article in the longitudinal direction and the width direction, 20 ml of physiological saline was dropped from each of the upper holes, and the time was measured from the time when the physiological saline contacted the absorbent article to the end point when the liquid was completely sucked into the circumference of the jig center circle (1 second time). After 3 minutes had passed, the same time was measured (second time), and the third time was measured in the same way.

(Liquid return amount)
With the top sheet facing upward, pour 120 ml of physiological saline toward the center of the absorbent body and leave it for 10 minutes. No. 2 filter paper, diameter 55 mm) was placed, a weight of 35 kgf/cm ² was placed on it, and after 30 seconds had passed, the weight of the filter paper was measured, and the difference in the weight of the filter paper was defined as the liquid return amount.

(Wet spreadability)
With the top sheet facing upward, 120 ml of physiological saline is poured toward the center of the absorbent body, and the time required for the physiological saline to spread 10 cm in the longitudinal direction of the product from the absorption site is measured, and the wetting and spreading property is measured. evaluated.

As shown in Table 1, it was found that the examples had good surface texture, excellent diffusion and absorption speed in the lateral direction, and little liquid return.
On the other hand, Comparative Example 1, which did not contain the perforated film, had a poor surface texture, was inferior in diffusion and absorption rate of simulated urine (physiological saline) in the lateral direction, and had a large amount of liquid returning. In Comparative Example 2, which includes a perforated film, but in which the larger perforated diameter of the perforated film faces the skin side, the surface feels good on the skin and the amount of liquid returned is less than that of Comparative Example 1, but the lateral direction is reduced. The result was that the diffusion and absorption speeds were inferior, and the absorption speed was particularly slower than that of Comparative Example 1.
As described above, according to the present invention, an absorbent article is provided in which, when receiving liquid from urination or the like, the absorbent article is quickly wetted and spread, thereby improving diffusibility and liquid permeability, and improving the liquid backflow prevention property. can provide.

10 Absorbent Article 20 Top Sheet 30 Back Sheet 40 Absorbent Body 41 Upper Layer Absorbent Body 42 Lower Layer Absorbent Body 50 Second Sheet of Liquid Diffusion Sheet 60 Carrier Sheet 70 Perforated Film 71 (Perforated Film) Top Sheet Side Surface 72 ( Backsheet side surface of apertured film 80 Three-dimensional gathers

Claims (5)

An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet,
An apertured film having a plurality of truncated cone-shaped apertures is provided between the top sheet and the absorbent body,
The perforated film is composed along the longitudinal direction of a center portion including the center in the width direction and both end portions that are regions on the left and right sides of the center portion in the width direction ,
on the top sheet side surface of the perforated film, the opening diameter of the openings in the central portion is smaller than the opening diameter of the openings in the both end portions,
The openings in the central portion have an opening diameter on the top sheet side surface smaller than an opening diameter on the back sheet side surface,
In the absorbent article, the openings at the both ends have an opening diameter on the top sheet side surface larger than an opening diameter on the back sheet side surface. The plurality of truncated conical openings have an opening diameter of 0.50 mm or more and 2 mm or less, a number of openings of 50 holes/cm ² or more and 200 holes/cm ^{2 or} less, and a basis weight of 20 g/m ^{2 .} 2. The absorbent article according to claim 1, wherein the weight is 60 g/m ^<2> or more. The absolute value of the difference between the hole diameter on the top sheet side surface and the hole diameter on the back sheet side surface is 0.03 mm or more and 0.15 mm or less in each of the central portion and the both end portions. 3. The absorbent article according to 1 or 2. 4. The absorbent article according to any one of claims 1 to 3, wherein a liquid-diffusing second sheet is provided between said top sheet and said perforated film. The absorbent article according to claim 4, wherein the second sheet has a basis weight of 10 g/m2 or ^more and 60 g/ ^m2 or less.

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