JP2020195419A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which has improved liquid diffusion properties and liquid permeability, and increased liquid return prevention properties.SOLUTION: An absorbent article 10 includes a liquid permeable top sheet 20, a porous film 70 having a plurality of openings of a circular truncated cone shape, an absorber 40 covered with a carrier sheet 60, and a liquid impermeable back sheet 30 in this order from a skin contact surface side. The absorber 40 is made of cellulose acetate tow where a high absorbent polymer is carried, and the porous film 70 and the top sheet 20 are bonded with a hot-melt adhesive. A bonded region is 10% or more and 50% or less relative to a surface area on the side of the top sheet 20 of the porous film 70. The porous film 70 and the absorber 40 have a non-bonded region of a width of 15 mm or more in a longitudinal direction Y at least in a central part in a width direction X of the porous film 70.SELECTED DRAWING: Figure 2

Description

The present invention relates to absorbent articles.

In general, absorbent articles such as light incontinence pads, pants-type disposable diapers, and tape-stopping disposable diapers include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber placed between the two sheets. It is composed of ,. As a result, body fluids such as urine are absorbed by the absorber through the top sheet and are prevented from leaking to the outside by the back sheet. Various measures have been taken for such absorbent articles in order to improve the absorbability of body fluids, improve the wearing feeling of the wearer, prevent leakage, and the like.

For example, there is a technique for improving absorption performance such as wet back and absorption rate by providing a perforated film at a predetermined position of an absorbent article. The opening area of the perforated film is the skin side surface and the non-skin side surface, and by setting the skin side> the non-skin side, the wet back and the absorption rate are improved.

As an absorbent article using a perforated film, for example, Patent Document 1 describes an absorbent article having a liquid-permeable surface material, a liquid-retaining absorbent material, and a liquid-impermeable leak-proof material. At least, it is made of a liquid-permeable sheet formed by laminating and integrating a skin contact surface layer and a non-skin contact surface layer, and the skin contact surface layer is made of an open film or synthetic fiber made of a thermoplastic resin. A technique formed by a non-woven fabric is disclosed.

Further, Patent Document 2 describes an absorber having an absorber layer containing at least one of a superabsorbent polymer (SAP) and fluff pulp as an absorber component, in which the absorber is in contact with the absorber layer. It is provided with an absorbent coating layer made of a water-resistant, highly breathable synthetic resin perforated film, and the absorbent coating layer prevents detachment of the absorbent component from the absorbent and provides morphological stability. Configured to hold, the perforated film has a large number of funnel-shaped protrusions with small parietal openings and large bottom perforations, the parietal portion of which serves as an absorber layer. Absorbents arranged in contact with each other are disclosed.

Patent Document 3 discloses a method for producing a water-absorbent article by opening a plurality of fibers of a tow with a gas, adding water-absorbent granules to the toe, and adhering a binder to the toe. According to this production method, the cellulose acetate tow can be opened and the fibers can be highly supported with a highly absorbent polymer.

Japanese Unexamined Patent Publication No. 8-66425 JP-A-2002-355271 JP-A-2018-003206

However, in Patent Document 1 provided with the perforated film, although all of them are excellent in liquid return prevention property such as wet back and absorption rate, they are effective in liquid diffusivity in an absorbent article. However, the absorption performance of the absorber has not been fully exhibited. Further, Patent Document 2 uses an opening film having a smaller opening area on the skin side surface than the conventional non-skin side surface, and has a configuration in which the surface having a small opening area is in contact with the absorber. Even in this case, there is a problem in improving the diffusibility of the liquid.
Further, in Patent Document 3, although cellulose acetate tow is an absorber that provides softness as compared with fluff pulp, it may have a weak water holding power and a insufficient effect of preventing liquid return. Further, the liquid permeability rate is slow, and there remains a problem in the performance of the absorber used for the water-absorbent article.

As in the above literature, some sanitary napkins and disposable diapers use a perforated film as a surface material on the receiving side, and by arranging the perforated film, liquid permeability and liquid return prevention are provided. Is improved. On the other hand, although many of the perforated films are more expensive than ordinary non-woven fabrics, they have problems in terms of more beneficial liquid permeability and liquid return prevention, and because they are resin films, they have a soft surface. You can feel the hardness.

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 having improved liquid diffusivity and liquid permeability and improved liquid return prevention property.

As a result of diligent research, the inventors of the present invention have found that the above problems can be solved by providing a perforated film having a specific configuration between the top sheet and the absorber, and have completed the present invention. ..

That is, the present invention comprises, from the skin contact surface side, a liquid permeable sheet, a perforated film having a plurality of conical trapezoidal holes, an absorber, and a liquid impermeable back sheet in this order, and the absorption. The body is made of cellulose acetate tow on which a highly absorbent polymer is supported, and the perforated film and the liquid permeable sheet are adhered with a hot melt adhesive, and the adhered region is the perforated film. 10% or more and 50% or less with respect to the surface area of the liquid permeable sheet side, and the perforated film and the absorber are at least in the central portion in the width direction of the perforated film in the longitudinal direction. It is an absorbent article having an unbonded region having a width of 15 mm or more.

The liquid permeable sheet may be a top sheet.

The liquid permeable sheet may include a top sheet and a second sheet in this order from the skin contact surface side, and the second sheet and the perforated film may be adhered to each other.

The basis weight of the top sheet / the basis weight of the second sheet × 100, which is the ratio of the basis weight of the top sheet to the basis weight of the second sheet, is preferably 50% or more and 130% or less.

It is preferable that the opening diameter of the surface of the perforated film on the liquid permeable sheet side is smaller than the opening diameter of the surface on the absorber side.

The difference between the opening diameter of the surface on the liquid permeable sheet side and the opening diameter of the surface on the liquid permeable sheet side is preferably 0.03 mm or more and 0.15 mm or less.

It is preferable that the top sheet and the second sheet are air-through non-woven fabrics, respectively.

The weight of the highly absorbent polymer / the weight of the cellulose acetate tow × 100 (%), which is the ratio of the weight of the highly absorbent polymer to the weight of the cellulose acetate tow in the absorber, is 40% or more. Is preferable.

The plurality of truncated cone-shaped openings have a hole diameter of 2 mm or less, a numerical aperture of 50 pieces / cm ² or more, and a basis weight of 20 g / m ² or more and 60 g / m ² or less. preferable.

Therefore, according to the present invention, it is possible to provide an absorbent article having improved liquid diffusivity and liquid permeability and improved liquid return prevention property.

It is a top view of the absorbent article of this invention. It is sectional drawing of XX of FIG. It is sectional drawing of the perforated film of this invention. It is a top view which shows the unbonded area of the perforated film and the carrier sheet of an absorber. It is a top view which shows the other unbonded area of the perforated film and the carrier sheet of an absorber.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, but these are listed for the purpose of exemplification, and the present invention is not limited thereto. The same elements are designated by the same reference numerals throughout the description of the embodiments.

Further, in the description of the present specification, the time when the absorbent article 10 is worn means at least one of the time when the absorbent article 10 is worn and the time after the absorbent article 10 is worn. The longitudinal direction of the absorbent article 10 is a direction extending in front of and behind the wearer when the absorbent article 10 is worn, and is a direction indicated by reference numeral Y in the drawing. Further, the width direction of the absorbent article 10 is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by reference numeral X in the drawing. Further, the skin contact surface is the surface of the front and back surfaces of each member such as the absorber that is arranged on the wearer's skin side when worn, and the non-skin contact surface is each member such as the absorber. Of the front and back sides of the above, the side facing the wearer's skin side when worn. Body fluid refers to the liquid discharged from the body to the outside of the body, such as urine, blood, and water in loose stool. Further, examples of the absorbent article 10 include, but are not limited to, a light incontinence pad, a pants-type disposable diaper, and a tape-stopping disposable diaper, regardless of whether they are for babies or adults, but other absorbent articles. There may be.

[Absorbent article]
FIG. 1 is a plan view of the absorbent article 10 according to the embodiment of the present invention as viewed from the top sheet 20 side. FIG. 2 is a cross-sectional view taken along the line XX of FIG.
As shown in FIGS. 1 and 2, the absorbent article 10 of the present embodiment has a liquid-permeable top sheet 20, a liquid-permeable second sheet 50, and a plurality of truncated cone-shaped openings from the skin contact surface side. A perforated film 70 having holes, an absorber 40 having a carrier sheet 60, and a liquid-impermeable back sheet 30 are provided in this order. Hereinafter, the liquid-permeable top sheet 20 is simply referred to as the top sheet 20, the liquid-permeable second sheet 50 is simply referred to as the second sheet 50, and the liquid-impermeable back sheet 30 is simply referred to as the back sheet 30. ..

It is preferable that the dimension L _{10 in the} longitudinal direction of the absorbent article 10 is 100 mm or more and 800 mm or less, and the dimension W _{10 in the} width direction is 50 mm or more and 500 mm. By adjusting the dimensions of the absorbent article 10 within the above range, an absorbent article 10 suitable for a light incontinence pad, a pants-type disposable diaper, a tape-stopping disposable diaper, or the like can be obtained.

Further, as shown in FIG. 2, the absorbent article 10 is used for three-dimensional gathering on the top sheet 20 along the longitudinal direction of the absorbent article 10 in order to prevent lateral leakage of the body fluid excreted by the user. A pair of three-dimensional gathers 80 having elastic members may be provided. The outer end of the three-dimensional gather 80 in the width direction X of the absorbent article 10 is fixed to the back sheet 30, the inner end thereof is fixed to the top sheet 20, and the center thereof is a free end not fixed to the top sheet 20. , Three-dimensional gather sheet is arranged. By providing the elastic member for three-dimensional gather along the longitudinal direction, the three-dimensional gather 80 has an upright property and can be deformed according to the body shape of the wearer. As the elastic member for three-dimensional gather, for example, a polyurethane thread, a band-shaped polyurethane film, a thread-like or band-shaped natural rubber, or the like is used, and as the three-dimensional gather sheet, water repellency or liquid impermeable formed of hydrophobic fibers. Nonwoven fabrics such as spunbonded non-woven fabrics, melt-blown non-woven fabrics, spunbonded non-woven fabrics / melt-blow non-woven fabrics / spunbonded non-woven fabrics, and the like are used.

(Top sheet)
The top sheet 20 may be formed of a base material having a liquid permeability that allows body fluid to move to the absorber 40. For example, a non-woven fabric such as an air-through non-woven fabric, a thermal bond non-woven fabric, or a spunbond non-woven fabric, or a thermal bond / It is formed from a material such as a composite non-woven fabric in which spunbonds are laminated, a foam film such as urethane foam, or a composite sheet in which these are laminated. Further, the surface of the top sheet 20 may be embossed or perforated in order to improve the liquid permeability. As a method for performing these embossing and drilling processes, known methods can be carried out without limitation. Further, in order to reduce irritation to the skin, the top sheet 20 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer and the like.

From the viewpoint of strength, workability and liquid return amount, the basis weight of the top sheet 20 is preferably 18 g / m ² or more and 40 g / m ² or less. The shape of the top sheet 20 is not particularly limited, but may be any shape that covers the absorber 40, which is required to guide the body fluid to the absorber 40 so as not to leak.

(Back sheet)
The back sheet 30 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 40 does not wet the clothes, and the resin film or the resin film and the non-woven fabric are laminated. It is formed from a material such as a composite sheet. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, and for example, a laminated composite non-woven fabric such as spunbond non-woven fabric, melt-blow non-woven fabric, spunbond / melt-blow or spunbond / melt-blow / spunbond, and a composite material thereof. Can be mentioned. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet 30 is preferably 15 g / m ² or more and 60 g / m ² or less. Further, in order to prevent stuffiness at the time of mounting, it is preferable that the back sheet 30 has air permeability. In order to provide the back sheet 30 with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet 30 may be embossed. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

(Second sheet)
As shown in FIG. 2, between the top sheet 20 and the perforated film 70, the liquid diffusibility of the absorbent article 10 is improved, the hardness of the perforated film 70 is suppressed, and the feel is improved. Therefore, it is preferable to arrange the liquid diffusible second sheet 50. The base material of the second sheet 50 may have a permeation rate of the body fluid faster than that of the top sheet 20 and may quickly diffuse the body fluid to the absorber 40. For example, a hydrophilic non-woven fabric, particularly an air-through non-woven fabric is preferable. The thickness of the second sheet 50 is preferably 0.1 mm or more, and the basis weight thereof is preferably 10 g / m ² or more and 60 g / m ² or less, and 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 larger than 60 g / m ² , the liquid is not sufficiently diffused over the entire upper surface of the absorber 40. The shape of the second sheet 50 is not particularly limited, but it is preferably a shape that can completely cover the surface of the absorber 40 so that the body fluid diffuses all over the absorber 40.
Although the second seat 50 is provided in the present embodiment, the second seat 50 may not be provided. In that case, the liquid-permeable top sheet 20 and the perforated film 70 are adhered to each other.

The basis weight of the top sheet / the basis weight of the second sheet × 100, which is the ratio of the basis weight of the top sheet 20 to the basis weight of the second sheet 50, is preferably 50% or more and 130% or less. When the basis weight ratio is within the above range, the physical properties of the top sheet 20 and the second sheet 50 are close to each other, so that the physical properties of either sheet are not affected and the characteristics of both can be fully utilized. .. In addition, the liquid diffusivity and liquid permeability when the liquid permeates from the top sheet 20 to the second sheet 50 are improved, and it becomes difficult for the liquid to return from the second sheet 50 to the top sheet 20.
It is preferable that the top sheet 20 and the second sheet 50 are both air-through non-woven fabrics.

(Opening film)
As shown in FIG. 2, the absorbent article 10 of the present embodiment includes a perforated film 70 having a plurality of truncated cone-shaped perforations between the top sheet 20 and the absorber 40.
The perforated film 70 in the absorbent article 10 of the present embodiment is adhered to the second sheet 50 with a hot melt adhesive, and the region of the perforated film adhered with the hot melt adhesive is the perforated film 70. It is 10% or more and 50% or less with respect to the surface area on the second sheet 50 side. Since the region of the perforated film 70 that is adhered with the hot melt adhesive is 10% or more, a large gap does not occur between the top sheet 20 and the perforated film 70, so that urine or the like is absorbed. It is possible to prevent urine and the like from flowing on the surface of the article 10 and to diffuse and absorb urine and the like well in the absorber 40. Further, since the area of the perforated film adhered by the hot melt adhesive is 50% or less, the adhesive does not block the perforations too much, and urine or the like flows along the surface of the absorbent article 10. This can prevent urine and the like from being satisfactorily diffused and absorbed by the absorber 40.

The hot melt adhesive is preferably applied by a spiral coating method or a spray coating method.

Further, as shown in FIG. 3, the opening diameter L1 on the surface of the opening film 70 on the top sheet 20 side is smaller than the opening diameter L2 on the surface on the absorber 40 side. From the viewpoint of liquid diffusivity, the difference between the opening diameter L2 on one surface having a large opening diameter and the opening diameter L1 on the other surface having a small opening diameter is preferably 0.03 mm or more and 0.15 mm or less.

The perforated film 70 preferably has a perforated diameter of 2 mm or less, more preferably 0.50 mm or more and 0.65 mm or less, in terms of liquid diffusibility, strength, and processability. When the opening diameter is smaller than 0.50 mm, the liquid permeability is good. Further, when the opening diameter is larger than 0.65 mm, it is preferable in terms of film strength and workability.
Here, the "opening diameter" is an average value obtained by photographing the opening film 70 with a 3D microscope (VR-3100) manufactured by KEYENCE CORPORATION and measuring the diameters of three arbitrarily selected holes.
Further, the opening diameter of the opening film 70 may be the same or different on the top sheet 20 side and the absorber 40 side.
Further, "the opening diameter is 2 mm or less" means that both the opening diameters on the surface of the opening film 70 on the top sheet 20 side and the surface on the absorber 40 side are 2 mm or less.

Further, from the viewpoint of liquid permeability, the numerical aperture is preferably 50 / cm ² or more. When the numerical aperture is 50 / cm ² or more, the hardness of the film is suppressed and the liquid permeability to the absorber 40 is improved.
Further, from the viewpoint of strength and workability, the basis weight of the perforated film 70 is preferably 20 g / m ² or more and 60 g / m ² or less, and more preferably 23 g / m ² or more and 30 g / m ² or less. preferable. When it is 20 g / m ² or more, it is possible to prevent the film from breaking. Further, when it is 60 g / m ² or less, the touch becomes soft.

By setting the perforation diameter, numerical aperture, and basis weight of the perforation film 70 within the above ranges, it is possible to obtain the perforation film 70 having excellent strength, processability, liquid permeability, and liquid diffusivity.

The perforated film 70 preferably has liquid permeability and liquid diffusivity such that body fluid moves to the absorber 40. As the material of the perforated film 70, polyethylene and polypropylene are preferable, and polyethylene is more preferable from the viewpoint of softness.

(Absorber)
The absorber 40 in the absorbent article 10 of the present embodiment is made of cellulose acetate tow on which a highly absorbent polymer (SAP) is supported.
In the absorbent article 10 of the present invention, as shown in FIG. 1, the dimension L ₄₀ of the longest width of the absorber 40 in the longitudinal direction Y is preferably 100 mm or more and 800 mm or less, and 150 mm or more and 500 mm or less. More preferred. Further, the longest dimension W ₄₀ of the absorber 40 in the width direction X is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less. Further, the longitudinal direction Y dimension L ₄₀ and the dimensions W ₄₀ in the width direction X of the absorbent body 40 can be the same or different.
Further, the absorber 40 has two layers, an upper layer absorber located on the skin contact surface side and a lower layer absorber located on the non-skin contact surface side, and a carrier between the upper layer absorber and the lower layer absorber. Sheets may be placed.

-Cellulose acetate tow with highly absorbent polymer supported-
The cellulose acetate tow used for the cellulose acetate tow on which the highly absorbent polymer is supported is preferably spread, and the basis weight of the opened cellulose acetate tow is 20 g / m ² or more and 120 g / m ² or less. It is preferably 45 g / m ² or more and 85 g / m ² or less. By setting the value within the above numerical range, there is no problem in forming the absorber 40, and there is no problem in the holding performance of the highly absorbent polymer.

In the absorber 40, the form of the cellulose acetate tow and the highly absorbent polymer may be formed by mixing the highly absorbent polymer particles in the cellulose acetate tow, and the highly absorbent polymer particles are fixed between the cellulose acetate tow. A highly absorbent polymer sheet may be used. Further, the absorber may be wrapped in a carrier sheet for the purpose of preventing leakage of the highly absorbent polymer particles and stabilizing the shape of the absorber. The base material of the carrier sheet may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets are provided, the base materials of the plurality of carrier sheets may be the same or different.

-Highly absorbent polymer-
The highly absorbent polymer is not particularly limited as long as it can absorb body fluids and prevent backflow. Sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft copolymers, Those formed from materials such as (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and their saponified products can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight.

The basis weight of the highly absorbent polymer supported on the cellulose acetate tow is preferably 100 g / m ² or more and 600 g / m ² or less, and more preferably 245 g / m ² or more and 445 g / m ² or less. .. By setting the value within the above numerical range, gel blocking in the absorber 40 can be prevented, and a large amount of body fluid can be absorbed in the absorber 40.

Further, in the absorber 40, the weight of the highly absorbent polymer / the weight of the cellulose acetate tow × 100 (%), which is the ratio of the weight of the highly absorbent polymer to the weight of the cellulose acetate tow, is 40% or more and 500% or less. It is preferably 80% or more and 300% or less. When the weight ratio of the highly absorbent polymer to the cellulose acetate tow is 40% or more, the excreted urine can be sufficiently absorbed. Further, when the above ratio is 500% or less, the highly absorbent polymer is sufficiently supported on the cellulose acetate tow and does not fall, and gel blocking caused by the expansion of the highly absorbent polymer that has absorbed urine. Can be prevented.
The weight ratio of the highly absorbent polymer to the cellulose acetate tow is more preferably 80% or more and 300% or less, which can sufficiently absorb the excreted urine and is less likely to cause gel blocking.

As shown in FIG. 4, the perforated film 70 and the absorber 40 have at least an unbonded region 90 having a width of 15 mm or more in the longitudinal direction Y at the center of the perforated film 70 in the width direction X.
Since the non-adhesive region 90 corresponds to the urination region, the non-adhesive region 90 creates a gap between the perforated film 70 and the absorber 40, improving the diffusivity of urine and the like. Urine and the like are quickly diffused into the absorber 40. The length of the unbonded region 90 in the longitudinal direction Y is preferably at least 50% of the product length.
Further, as shown in FIG. 5, the unbonded region 90 may be the central portion of the perforated film 70 in the width direction X and may be from one end to the other end in the longitudinal direction Y.
Further, in the present embodiment, the embodiment in which the unbonded region 90 is provided in the central portion in the width direction X has been described, but in the present invention, at least the region corresponding to the urination region may be unbonded, and the perforated film. The 70 and the absorber 40 may be unbonded over the entire area.

-Carrier sheet-
As shown in FIG. 2, the absorber 40 in the absorbent article 10 of the present invention may include a liquid diffusible carrier sheet 60. In this case as well, as described above, the perforated film 70 and the carrier sheet 60 are not adhered to at least the central portion of the perforated film 70 in the width direction X with a width of 15 mm or more in the longitudinal direction Y, as shown in FIG. Any one having a region 90 may be used.

The base material of the carrier sheet 60 may be any one having hydrophilicity, and a tissue containing pulp or absorbent paper is particularly preferable, but a hydrophilic non-woven fabric such as an air-laid non-woven fabric may also be used. When a plurality of carrier sheets 60 are provided, the base materials of the plurality of carrier sheets 60 may be the same or different.
For the adhesion between the absorber 40 and the carrier sheet 60, a spiral coating method of a hot melt adhesive is preferable from the viewpoint of maintaining softness.

The carrier sheet 60 may be arranged on the back sheet 30 side of the absorber, or may be arranged on both the top sheet 20 side and the back sheet 30 side of the absorber 40.
..

Although the present invention has been described above 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-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. Further, it is clear from the description of the claims that the form in which such a modification or improvement is added may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

[Example 1]
(Making absorbent articles)
As an absorber, an opened cellulose acetate tow (basis weight 70 g / m ² ) dispersed with SAP (5.0 g) is used, and as a top sheet, an air-through non-woven fabric (basis weight 25 g / m ² ) is used. used as a liquid-impermeable backsheet, using breathable polyethylene sheet (basis weight 32 g / ^{m 2),} air-through nonwoven fabric as a second sheet (basis weight 30 g ^{/ m} 2), as standing gathers, spunbond / meltblown / spun Three-layer laminated composite composite non-woven fabric of bond (basis weight 15 g / m ² ), tissue (basis weight 16 g / m ² ) as carrier sheet on the absorber, spun bond non-woven fabric (basis weight 15 g / m ² ) as carrier sheet under the absorber Was used.
Further, an opening film (basis weight 26 g / m ² ) was placed under the second sheet with the side having the smaller opening diameter as the second sheet side. At that time, the second sheet and the perforated film were adhered by hot melt at an area ratio of 15%, and the perforated film and the tissue were not adhered to each other. The dimensions of the absorbent article were 273 mm in the longitudinal direction and 105 mm in width, and the dimensions of the absorber were 220 mm in the longitudinal direction and 71 mm in width, which were used as the sample of Example 1.

[Example 2]
In Example 2, an absorbent article was prepared in the same manner as in Example 1 except that the second sheet and the perforated film were adhered by hot melt in an adhesive region of 40%.

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

[Comparative Example 2]
An absorbent article was prepared in the same manner as in Example 1 except that the second sheet and the perforated film were not adhered.

[Comparative Example 3]
An absorbent article was produced in the same manner as in Example 1 except that the second sheet and the perforated film were adhered in an adhesive region of 5%.

[Comparative Example 4]
An absorbent article was produced in the same manner as in Example 1 except that the second sheet and the perforated film were adhered in an adhesive region of 60%.

[Comparative Example 5]
An absorbent article was produced in the same manner as in Example 1 except that the second sheet and the perforated film were adhered in an adhesive region of 80%.

[Comparative Example 6]
An absorbent article was produced in the same manner as in Example 2 except that the perforated film and the carrier sheet were adhered to almost the entire surface.

[Evaluation]
Table 1 shows the evaluation results obtained by performing the following evaluations on the above Examples and Comparative Examples.
(Touch of the surface of absorbent articles)
Eight panelists evaluated the feel of the surface of the absorbent article. When the surface of the absorbent article is touched and the number of evaluators who "feel the surface is soft" is 6 or more and 8 or less, "A", and when the number of evaluators who "feel the surface is soft" is 3 or more and 5 or less "B", when there was one or two evaluators who "feel soft on the surface", or when there was no evaluator who "feels soft on the surface" was defined as "C".

(Difficulty in leaking absorbent articles)
Eight panelists evaluated the leak resistance of absorbent articles. When two absorbent articles were actually used and the number of evaluators who "had no side leakage or back leakage" was 6 or more and 8 or less, "A" and "no side leakage or back leakage occurred" evaluation. "B" when there are 3 or more and 5 or less people, "No side leakage or back leakage" When there are 1 or 2 evaluators, or "No side leakage or back leakage" When there was no person, it was designated as "C".

(Absorption rate 3 times method)
A measuring jig having an inner diameter of 19 mm and a weight of 755.6 g is placed in the center of a cylinder having a bottom area of 16.8 cm ² in the longitudinal direction and the width direction of the absorbent article. , 40 ml of physiological saline was dropped from the upper hole, and the time was measured from the time when the physiological saline came into contact with the absorbent article, starting from the point where the liquid was completely sucked into the circumference in the center circle of the jig.

(Return amount)
With the top sheet facing up, 120 ml of physiological saline was poured toward the center of the absorber, left for 10 minutes, and then weighed in advance on the physiological saline absorption site (manufactured by ADVANTEC). 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 weight difference of the filter paper was taken as the amount of liquid return.

As shown in Table 1, when the absorbent article of the present invention receives a liquid by urination or the like, it quickly wets and spreads, so that the liquid permeability is improved, the liquid return prevention property can be improved, and the skin feels. It is possible to provide an absorbent article that is also excellent in

10 Absorbent article 20 Top sheet 30 Back sheet 40 Absorber 50 Second sheet 60 Carrier sheet 70 Perforated film 80 Three-dimensional gather 90 area

Claims (9)

From the skin contact surface side, a liquid-permeable sheet, a perforated film having a plurality of truncated cone-shaped holes, an absorber, and a liquid-impermeable back sheet are provided in this order.
The absorber comprises a cellulose acetate tow carrying a highly absorbent polymer.
The perforated film and the liquid permeable sheet are adhered with a hot melt adhesive, and the bonded region is 10% or more with respect to the surface area of the perforated film on the liquid permeable sheet side. 50% or less,
An absorbent article in which the perforated film and the absorber have an unadhered region having a width of 15 mm or more in the longitudinal direction at least in the central portion in the width direction of the perforated film. The absorbent article according to claim 1, wherein the liquid permeable sheet is a top sheet. The absorbent article according to claim 1, wherein the liquid permeable sheet includes a top sheet and a second sheet in this order from the skin contact surface side, and the second sheet and the perforated film are adhered to each other. The absorbent article according to claim 3, wherein the basis weight of the top sheet / the basis weight of the second sheet × 100, which is the ratio of the basis weight of the top sheet to the basis weight of the second sheet, is 50% or more and 130% or less. The absorbent article according to any one of claims 1 to 4, wherein the pore diameter of the surface of the perforated film on the liquid permeable sheet side is smaller than the pore diameter of the surface of the absorber. The absorbent article according to claim 5, wherein the difference between the opening diameter of the surface on the liquid permeable sheet side and the opening diameter of the surface on the liquid permeable sheet side is 0.03 mm or more and 0.15 mm or less. The absorbent article according to any one of claims 1 to 6, wherein the top sheet and the second sheet are air-through non-woven fabrics, respectively. A claim that the weight of the highly absorbent polymer / the weight of the cellulose acetate tow × 100 (%), which is the ratio of the weight of the highly absorbent polymer to the weight of the cellulose acetate tow in the absorber, is 40% or more. Item 2. The absorbent article according to any one of Items 1 to 7. The plurality of truncated cone-shaped openings have a diameter of 2 mm or less, a numerical aperture of 50 pieces / cm ² or more, and a basis weight of 20 g / m ² or more and 60 g / m ² or less. The absorbent article according to any one of 1 to 8.

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