JP2020081623A - Absorbent article - Google Patents

Abstract

To provide an absorbent article having features in which diffusibility and liquid permeability are improved by quickly getting wet and being spread when receiving liquid by urination, etc., and thereby liquid return, side leakage and back leakage are less likely to occur.SOLUTION: An absorbent article is provided in which an open hole film having multiple infundibular apertures and an absorbent body covering sheet are arranged between a top sheet and an absorbent body, the absorbent article that is characterized by setting a bonded area rate and a bonding area in a predetermined range with hot melt adhesives.SELECTED DRAWING: Figure 1

Description

The present invention relates to an absorbent article having an apertured film.

Generally, absorbent articles such as light incontinence pads, pants-type paper diapers, and taped paper diapers include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between both sheets. ,,. As a result, body fluid such as urine is absorbed by the absorber through the top sheet and is prevented from leaking to the outside by the back sheet. Various measures have been made to 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 the absorption performance such as wet back and absorption speed by providing an apertured film at a predetermined position of the absorbent article. The aperture area of the aperture film is on the skin side and the non-skin side so that the skin side>non-skin side improves wet back and absorption rate.

As an absorbent article using an apertured 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 leak-proof material. , At least a skin-contacting surface layer and a non-skin-contacting surface layer are laminated and integrated into a liquid-permeable sheet, and the skin-contacting surface layer is formed of a thermoplastic resin perforated film or synthetic fiber. A technique formed by a non-woven fabric is disclosed.

Further, Patent Document 2 includes a surface layer provided in order from top to bottom, an absorption layer, and a bottom layer, and the absorption layer includes, from top to bottom, a perforated film layer, a core layer, and a bottom adhesion layer. Disclosed is a urine absorbing pad, wherein the perforated film layer is located between the surface layer and the core layer, and the lower adhesion layer is located between the core layer and the bottom layer.

Patent Document 3 discloses an absorbent body having an absorbent body layer containing at least one of SAP and fluff pulp as an absorbent body component, wherein the absorbent body is disposed in contact with the absorbent body layer, and is water resistant and highly breathable. An absorber coating layer made of a synthetic resin aperture film is provided, and the absorber cover layer is configured to prevent separation of the absorber component from the absorber and to maintain morphological stability. Disclosed is an absorbent body in which a film has a large number of funnel-shaped projections having a small opening at the top and a large opening at the bottom, and the tops of the projections are arranged in contact with the absorbent layer. ing.

JP-A-8-66425 Registered utility model No. 3215515 JP, 2002-355271, A

However, in Patent Document 1 and Patent Document 2 provided with the above-described apertured film, both have excellent liquid return prevention properties such as wet back and excellent absorption speed, but are effective in liquid diffusibility in the absorbent article. It cannot be said that it is a thing, and the absorption performance of the absorber is not fully exhibited.

Further, Patent Document 3 uses an apertured film in which the aperture area of the skin side surface is smaller than that of the conventional non-skin side surface, and the surface of the aperture surface 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 literature, as the liquid receiving side surface material of a sanitary napkin or a disposable diaper, there are those in which an apertured film is used, and by arranging the apertured film, liquid permeability, liquid return prevention Be improved. However, even though many apertured films are more expensive than ordinary non-woven fabrics, they are insufficient to show more useful liquid permeability, liquid return, side leakage, and back leakage prevention, and resin films Therefore, I felt the hardness on the touch side.

Therefore, the present invention has been made in view of the above problems, the present invention, when receiving liquid such as urination, by quickly wet spread, diffusibility and liquid permeability is improved, liquid return and side leakage. An object of the present invention is to provide an absorbent article having a feature of improving the back leakage prevention property.

Specifically, by arranging a perforated film and an absorbent body covering sheet between the top sheet and the absorbent body, and setting the bonding area ratio and the bonding area with the hot melt adhesive to an appropriate range, the hardness of the resin film can be improved. The absorption of urine can be suppressed, and the discharged urine can be diffused throughout the absorbent article so that the liquid can be widely absorbed in the entire absorbent body, resulting in improved liquid return, side leakage, and back leakage prevention. It is an object to provide an absorbent article that can be made.

The inventors of the present invention have conducted diligent research in view of the above problems. As a result, the opening film and the absorbent body covering sheet are arranged between the top sheet and the absorbent body, and the above-mentioned problem is solved by setting the bonding area ratio and the bonding area with the hot melt adhesive to an appropriate range. The present invention has been completed and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet, Between the top sheet and the absorber, an apertured film having a plurality of funnel-shaped apertures is arranged, and between the absorber and the apertured film, an absorbent cover sheet is disposed. When the hot melt adhesive is applied to the skin contacting surface of the perforated film and is subjected to an adhesive treatment with the upper layer part, the adhesive area ratio of the skin contacting surface of the perforated film is 10%. 50% or less, the upper layer is the top sheet, a hot-melt adhesive is applied to the skin non-contact surface of the apertured film, when the adhesive coating with the absorber coating sheet, In the apertured film and the absorbent body covering sheet, an unbonded region having a width of 15 mm or more exists in the widthwise central portion of the absorbent article, and the apertured area ratio of the apertured film is 25% or more and 50% or less. It is an absorbent article characterized by being.

(2) A second aspect of the present invention is the absorbent article according to (1), in which a liquid diffusing second sheet is arranged between the top sheet and the apertured film, and the upper layer is provided. The part is the second seat.

(3) A third aspect of the present invention is the absorbent article according to (1) or (2), characterized in that the absorbent body covering sheet is made of pulp.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the top sheet and/or the second sheet is an air-through nonwoven fabric. It is what

(5) A fifth aspect of the present invention is the absorbent article according to any one of (2) to (4), wherein the ratio of the areal weight of the top sheet to the second sheet is 50% or more and 130% or more. It is characterized by the following.

(6) A sixth aspect of the present invention is the absorbent article according to any one of (1) to (5), wherein the absorbent body contains fluff pulp and a superabsorbent polymer, The ratio of the weight of the superabsorbent polymer to the weight of the entire absorbent body is 40% or more.

(7) A seventh aspect of the present invention is the absorbent article according to any one of (1) to (6), wherein the aperture film has an aperture diameter of 2 mm or less and the number of apertures is equal to or less than 2 mm. It is 50 pieces/cm ² or more, and the grammage is 20 g/m ² or more and 60 g/m ² or less.

(8) An eighth aspect of the present invention is the absorbent article according to any one of (1) to (7), wherein the aperture film has a small aperture diameter on one surface in the thickness direction, A hole having a large opening diameter on the other surface is provided, and a difference between the opening diameter of the one surface having a large opening diameter and the opening diameter of the other surface having a small opening diameter is 0.03 mm or more and 0.15 mm or less. It is characterized by being.

Therefore, according to the present invention, by arranging the perforated film and the absorbent body covering sheet between the top sheet and the absorbent body, and by setting the bonding area ratio and the bonding area with the hot melt adhesive to an appropriate range, It is possible to provide an absorbent article that has improved diffusivity and liquid permeability and can improve the property of preventing liquid return, side leakage, and back leakage.

It is a top view of an absorbent article of the present invention. It is a cross-sectional view of the _X 1 -X ₁ in Fig. It is sectional drawing of the aperture film of this invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter, embodiments) will be described in detail with reference to the accompanying drawings, but these are given for the purpose of illustration, and the present invention is not limited by these. Absent. The same elements are denoted by the same reference symbols throughout the description of the embodiments.

Further, in the description of the present specification, “when the absorbent article 1 is worn” means at least one of when the absorbent article 1 is worn and after it is worn. The longitudinal direction of the absorbent article 1 is a direction extending in the front and back of the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the drawing. Further, the width direction of the absorbent article 1 is a direction that is lateral or orthogonal to the longitudinal direction, and is the direction indicated by the symbol X in the drawing. Further, the skin contacting surface is a surface of the front and back surfaces of each member such as an absorber that is arranged on the skin side of the wearer when worn, and the non-skin contacting surface is each member such as the absorber. Of the front and back surfaces, the surface facing away from the wearer's skin side when worn. The body fluid is a fluid such as urine, blood, or water in loose stool discharged from the body to the outside of the body. Furthermore, examples of the absorbent article 1 include a light incontinence pad, a pants-type paper diaper, and a taped paper diaper for baby or adult, but the absorbent article 1 is not limited to this, and other absorbent articles may be used. It may be.

<Absorptive article>
FIG. 1 is a plan view of an absorbent article 1 according to an embodiment of the present invention viewed from the topsheet 10 side. As shown in FIG. 1, the absorbent article 1 includes a liquid-permeable topsheet 10 arranged on the skin contact surface side and a liquid impermeable surface opposed to the topsheet 10 on the non-skin contact surface side. The transparent backsheet 20 and the absorber 30 arranged between the topsheet 10 and the backsheet 20 are provided. As a result, the absorbent body 30 has a structure sandwiched between the top sheet 10 and the back sheet 20.

The absorbent article 1 preferably has a lengthwise dimension of 100 mm or more and 800 mm or less and a widthwise dimension of 50 mm or more and 500 mm or less. By adjusting the size of the absorbent article 1 within the above range, it is possible to obtain the absorbent article 1 suitable for a light incontinence pad, a pants-type paper diaper, a taped paper diaper, and the like.

As shown in FIG. 2, the absorbent article 1 has three-dimensional gathers on the topsheet 10 along the longitudinal direction of the absorbent article 1 in order to prevent lateral leakage of body fluids excreted by the user. A pair of three-dimensional gathers 60 having elastic members may be provided. The outer end of the three-dimensional gather 60 in the width direction of the absorbent article 1 is fixed to the backsheet 20, the inner end thereof is fixed to the topsheet 10, and the center thereof is a free end that is not fixed to the topsheet 10. A three-dimensional gathered sheet is arranged. By providing the elastic member for three-dimensional gathers along the longitudinal direction, the three-dimensional gather 60 has an upright property and can be deformed according to the wearer's body shape. As the elastic member for the three-dimensional gather, for example, polyurethane thread, strip-shaped polyurethane film, thread-shaped or strip-shaped natural rubber, etc. are used, and as the three-dimensional gather sheet, water repellent or liquid impermeable formed of hydrophobic fiber. Non-woven fabrics such as spun bond non-woven fabrics, melt blown non-woven fabrics, and composite non-woven fabrics obtained by laminating spun bonds/melt blown/spun bonds.

<Top sheet>
The topsheet 10 may be formed of a substrate having liquid permeability that allows body fluid to move to the absorbent body 30, and for example, a nonwoven fabric such as an air-through nonwoven fabric, a thermal bond nonwoven fabric, a spunbond nonwoven fabric, or a thermal bond/ It is formed from a material such as a composite non-woven fabric in which spunbond is laminated, a foamed film such as urethane foam, or a composite sheet in which these are laminated. Among them, an air-through non-woven fabric is preferable because it has excellent liquid permeability. In addition, the surface of the top sheet 10 may be embossed or perforated in order to improve liquid permeability. As a method for performing these embossing and perforating processes, known methods can be used without limitation. Moreover, in order to reduce the irritation to the skin, the top sheet 10 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjusting agent, an antibacterial agent, a moisturizing agent and the like.
From the viewpoints of strength, workability, and the amount of liquid returned, the basis weight of the top sheet 10 is preferably 18 g/m ² or more and 40 g/m ² or less. The shape of the top sheet 10 is not particularly limited, but may be any shape as long as it covers the absorbent body 30 and is required to guide the body fluid to the absorbent body 30 so as not to leak.

<Back sheet>
The backsheet 20 may be formed using a base material having a liquid impermeable property such that the body fluid held by the absorber 30 does not wet clothes, and a resin film or a resin film and a nonwoven fabric are laminated. Formed of a material such as a composite sheet. The nonwoven fabric used for the composite sheet is not particularly limited in its production method, and examples thereof include spunbonded nonwoven fabrics, meltblown nonwoven fabrics, composite nonwoven fabrics obtained by laminating spunbond/meltblown, spunbond/meltblown/spunbond, and composite materials thereof. Can be mentioned. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, a composite film of polyethylene and polypropylene, and the like.

From the viewpoint of strength and workability, the basis weight of the backsheet 20 is preferably 15 g/m ² or more and 60 g/m ² or less. In addition, it is preferable that the back sheet 20 has breathability in order to prevent stuffiness during mounting. In order to provide the back sheet 20 with air permeability, for example, a resin film as a base material may be mixed with a filler, or the back sheet 20 may be embossed. As the filler, calcium carbonate can be mentioned, and the compounding method thereof can be carried out by a known method without limitation.

<Aperture film>
In the present invention, the aperture film 70 having a plurality of funnel-shaped apertures is arranged between the top sheet 10 and the absorber 30.
The apertured film 70 preferably has liquid permeability and liquid diffusibility so that body fluid moves to the absorber 30, and the shape of the apertured film 70 is not particularly limited, but strength and workability are preferable. From the viewpoint, the basis weight of the apertured 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. From the viewpoint of liquid permeability, the number of openings is preferably 50/cm ² or more. Further, from the viewpoint of liquid diffusibility, the opening diameter is preferably 2 mm or less, more preferably 0.50 mm or more and 0.65 mm or less. By setting the number of apertures, aperture diameter and basis weight of the apertured film 70 within the above ranges, an apertured film 70 excellent in strength and processability and excellent in liquid permeability and liquid diffusibility can be obtained. ..
The open area ratio of the open film 70 is 25% or more and 50% or less, and preferably 30% or more and 40% or less. By setting the aperture area ratio of the apertured film 70 to 25% or more and 50% or less, the apertured film 70 having excellent liquid permeability and liquid diffusivity can be obtained. The aperture film 70 is made of, for example, polyethylene.

Further, as shown in FIG. 3, the perforated film 70 is perforated such that one surface has a smaller opening diameter L1 and the other surface has a larger opening diameter L2 in the thickness direction. From the viewpoint of liquid diffusibility, it is preferable that 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 0.03 mm or more and 0.15 mm or less.

<Absorber>
In the absorbent article 1 of the present invention, the dimension LO of the longest width in the longitudinal direction of the absorbent body 30 is preferably 100 mm or more and 800 mm or less, and more preferably 150 mm or more and 500 mm or less. Further, the dimension WO of the longest width in the width direction of the absorber 30 is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less.

(Absorptive fiber)
The absorber 30 contains an absorbent fiber as a base material and a super absorbent polymer (SAP).
The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, paper diapers, and urine absorbing pads, and examples thereof include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic. A non-woven fabric and the like can be mentioned. Among these, fluff pulp is preferably used from the viewpoint of absorbability. Examples of the fluff pulp include wood pulp (for example, bleached softwood kraft pulp (N-BKP) such as Southern pine and Douglas fir), synthetic fibers, resin fibers, non-wood pulp, and the like that have been defibrated into a cotton shape. it can. The absorber 30, the case of using fluff pulp in the absorbent fibers as the base material, the basis weight of the absorbent fibers is preferably at 100 g / ^{m 2} or more 800 g / ^{m 2} or less, 325 g / ^{m 2} or more 615g /M ² or less is more preferable. This makes it possible to absorb more body fluid without impairing the feel of the skin.

(Super absorbent polymer)
The superabsorbent polymer of the absorbent body 30 is not particularly limited as long as it can absorb body fluid and can prevent backflow. Sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft Those formed from materials such as copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof can be used. Among these, from the viewpoint of the amount of absorption per weight, sodium polyacrylate type is preferable.

The basis weight of the SAP contained in the absorber 30 is preferably 240 g/m ² or more and 450 g/m ² or less, and 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 30 can be prevented and a large amount of body fluid can be absorbed in the absorbent body 30.
Further, in the absorbent body 30, the ratio of the weight of the superabsorbent polymer to the total weight of the absorbent body 30, ie, the weight of the superabsorbent polymer/the total weight of the absorbent body 30×100(%) is 40% or more. It is preferable that it is 40% or more and 70% or less.

In the absorbent body 30, the form of the absorbent fiber and the SAP may be formed by mixing SAP particles in the absorbent fiber, or may be a SAP sheet having the SAP particles fixed between the absorbent fibers. Further, for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 30, a carrier sheet may be provided below the absorber 30 (not shown). The base material of the carrier sheet may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabric 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.

<Absorber cover sheet>
In the absorbent article 1 of the present invention, as shown in FIG. 2, the absorbent body covering sheet 50 is arranged between the aperture film 70 and the absorbent body 30. The base material of the absorbent body covering sheet 50 may be any one as long as it has hydrophilicity, and in particular tissue such as pulp or absorbent paper is preferable, but hydrophilic non-woven cloth such as air-laid non-woven cloth may be used.

<Second seat>
In addition, as shown in FIG. 2, between the topsheet 10 and the apertured film 70, the liquid diffusion property of the absorbent article 1 is improved, and the hardness of the apertured film 70 is suppressed so that the skin feels good. In order to improve the quality, it is preferable to dispose the second sheet 40 having the liquid diffusion property. The base material of the second sheet 40 may be any one as long as it has a faster body fluid permeation rate than the top sheet 10 and diffuses body fluid into the absorber 30 quickly. For example, a hydrophilic nonwoven fabric, particularly an air-through nonwoven fabric is preferable. The thickness of the second sheet 40 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. When the thickness is less than 0.1 mm, or the basis weight is less than 10 g/m ² or more than 60 g/m ² , the liquid is not sufficiently diffused over the entire upper surface of the absorbent body 30. The shape of the second sheet 40 is not particularly limited, but it is preferable that the surface of the absorbent body 30 can be completely covered so that the bodily fluid diffuses throughout the absorbent body 30.
The ratio of the areal weight of the top sheet 10 to the second sheet 40 is preferably 50% or more and 130% or less, and more preferably 50% or more and 100% or less. By setting the weight ratio to be 50% or more and 130% or less, the liquid diffusivity and liquid permeability when the liquid permeates from the top sheet 10 to the second sheet 40 is improved, and the liquid from the second sheet 40 to the top sheet 10 is liquid. It becomes difficult to return.

(Adhesion treatment)
When producing the absorbent article 1 of the present invention, as shown in FIG. 2, from the non-skin contact surface, the back sheet 20, the absorber 30, the absorber covering sheet 50, the aperture film 70, the second sheet 40, The top sheet 10 and the three-dimensional gather 60 are laminated in this order. At this time, a hot melt adhesive is applied to the skin contact surface of the apertured film 70, and the upper layer portion is bonded. At this time, the upper layer portion to which the apertured film 70 is bonded is the top sheet 10, but when the second sheet 40 is included in the absorbent article 1, the upper layer portion is preferably the second sheet 40.
At this time, the adhesive area ratio of the apertured film 70 coated with the hot melt adhesive is 10% or more and 50% or less, and preferably 20% or more and 40% or less. By setting the adhesion area ratio to 10% or more and 50% or less, the adhesion area ratio between the topsheet 10 or the second sheet 40 and the aperture film 70 becomes an appropriate area, and the liquid leakage on the surface of the absorbent article 1 is prevented. As a result, side leakage and back leakage can be prevented. If the adhesion area ratio is less than 10%, a gap is created between the topsheet 10 or the second sheet 40 and the apertured film 70, and the liquid easily flows along the surface of the absorbent article 1, resulting in side leakage and This may cause back leakage, and liquid may reach the end of the product and stain underwear. Further, when the adhesion area ratio exceeds 50%, the hot melt adhesive fills the openings of the opening film 70, the liquid does not reach the absorber 30, and the liquid flows along the surface of the absorbent article 1. It becomes easier to do.

It is also possible to apply a hot melt adhesive to the non-skin contact surface of the apertured film 70 and perform an adhesive treatment with the absorbent body covering sheet 50. In that case, as shown in FIGS. An unbonded region 80 exists in the central portion in the width direction of the sex article 1. As shown in FIG. 1, the central portion in the width direction is the longest width LC in the longitudinal direction centered on the longitudinal center line X ₁ -X ₁ of the absorbent article 1 and the width direction center line Y _{1 of the} absorbent article _1. This is a region surrounded by the longest width WC in the width direction centered on -Y ₁ .
Although the unbonded area 80 is shown as a rectangle in FIG. 1, the unbonded area 80 may have a substantially elliptical shape or a substantially rhombic shape.

The dimension of the longest width WC in the width direction of the unbonded region 80 is 15 mm or more, and preferably 25 mm or more and 70 mm or less. The dimension of the longest width LC in the longitudinal direction is preferably 70 mm or more, more preferably 90 mm or more and 250 mm or less. There is an unbonded region 80 having a WC of 15 mm or more, that is, the aperture film 70 and the absorbent body covering sheet 50 are not adhered to each other in the central portion of the absorbent article 1, so that the aperture film 70 and the absorbent body covering sheet are formed. A gap is formed between the absorbent article 50 and the absorbent article 50, and as a result, the liquid diffusivity is improved and the liquid quickly spreads over the entire absorbent body 30 inside the absorbent article 1.
When the perforated film 70 and the absorbent body covering sheet 50 are adhered to each other at a portion other than the non-adhered region 80, the adhering area ratio is preferably 50% or less.

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 embodiments and examples. It will be apparent to those skilled in the art that various modifications and improvements can be added to the above-described embodiment. It is also apparent from the scope of the claims that the embodiments added with such changes or improvements can 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.

(Creation of absorbent article)
In the absorber, 7 g of fluff pulp which is a base material was mixed with 6 g of SAP, and an air-through nonwoven fabric (basis weight 25 g/m ² ) was used as the top sheet. as 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, the composite nonwoven fabric obtained by laminating a spunbonded / meltblown / spunbond ( basis weight 15g ^{/ m} 2), tissue as an absorber covering sheet (basis weight 16g ^{/ m} 2), was used spunbond nonwoven as a carrier sheet (basis weight 15g / ^{m 2).} An aperture film (basis weight 26 g/m ² ) was placed under the second sheet, and the side with the smaller aperture diameter was placed as the second sheet side. At that time, the second sheet and the apertured film were adhered with a hot melt adhesive at an adhesion area ratio of 30%, and the apertured film and the absorbent body covering sheet were not adhered. 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.

An absorbent article was prepared in the same manner as in Example 1 except that the perforated film was not provided in Comparative Example 1 to obtain a sample of Comparative Example 1. Further, an absorbent article was prepared in the same manner as in Example 2 except that the second sheet and the apertured film were not adhered to each other in Comparative Example 2 to obtain a sample of Comparative Example 2. Further, an absorbent article was prepared in the same manner as in Example 3 except that the second sheet and the apertured film were adhered at an adhesion area ratio of 80% in Comparative Example 3 to obtain a sample of Comparative Example 3. Further, in Comparative Example 4, an absorbent article was prepared in the same manner as in Example except that the opening area film and the absorbent body covering sheet were bonded at an adhesion area ratio of 80%, and was used as a sample of Comparative Example 4. ..

(Soft feel of absorbent article surface)
Eight panelists evaluated the feel of the surface of the absorbent article. Touching the surface of the absorbent article, "○" when there are 6 or more and 8 or less evaluators who "feel the surface is soft", and when 3 or more and 5 or less evaluators who "feel the surface is soft" When there was one or two evaluators having a “Δ” or “feeling the surface was soft” or no evaluators having a “feeling the surface was soft”, there was an “x”. The results are shown in Table 1.

(Difficult to leak absorbent articles)
Eight panelists evaluated the leak resistance of the absorbent article. When two absorbent articles were actually used and there were 6 or more and 8 or less evaluators "no side leakage or back leakage", "○", "no side leakage or back leakage" was evaluated. When the number of persons is 3 or more and 5 or less, "△", "No side leakage or back leakage occurred" Evaluator was 1 or 2 persons, or "No side leakage or back leakage occurred" evaluation “No” was given when no one was present. The results are shown in Table 1.

(Absorption rate)
A hole having an inner diameter of 19 mm is opened in the center of a cylinder having a bottom area of 16.8 cm ² , and a measuring jig having a weight of 755.6 g is placed on the central portion in the longitudinal direction and the width direction of the absorbent article, 20 ml of physiological saline was dropped from each of the holes in the upper part, and the time was measured from the time when the physiological saline came into contact with the absorbent article to the point where the liquid was completely sucked into the circumference of the jig central circle. The results are shown in Table 1.

(Liquid return amount)
With the top sheet facing upward, 120 ml of physiological saline was poured toward the center of the absorbent body, and after leaving it for 10 minutes, a filter paper (manufactured by ADVANTEC) was weighed in advance on the physiological saline absorption site. No. 2 filter paper (diameter 55 mm) was placed, a weight of 35 kgf/cm ² was placed on it, and after 30 seconds, the weight of the filter paper was measured, and the weight difference of the filter paper was used as the liquid return amount. The results are shown in Table 1.

From the results in Table 1, Comparative Example 1 containing no apertured film had a poor surface feel, an inferior absorption rate, side leakage and back leakage, and a large amount of liquid returned. Comparative Example 2 including the perforated film but not adhering the second sheet and the perforated film and Comparative Example 3 having a large bonded area ratio all have good surface feel, and Comparative Example 2 has a high absorption speed and is a liquid. Although the amount of return was small, there was side leakage and back leakage in both cases. In Comparative Example 4 in which the perforated film and the absorbent body covering sheet were adhered to each other, the amount of liquid returned was small, but the touch was poor, side leakage and back leakage were large, and the absorption speed was slow.
On the other hand, the bonding area ratio between the second sheet and the perforated film is within a predetermined range, and the example in which the perforated film and the absorbent body covering sheet are not adhered has a good surface feel and an excellent absorption rate. It was found that there was no side leakage or back leakage, and it was difficult for the liquid to return.
Therefore, according to the present invention, it is possible to provide an absorbent article which is excellent in diffusivity and liquid permeability of urine and can prevent side leakage, back leakage, and liquid return when receiving liquid such as urination. it can.

1 Absorbent Article 10 Top Sheet 20 Back Sheet 30 Absorber 40 Second Sheet 50 Absorber Cover Sheet 60 Three-Dimensional Gather 70 Opening Film 80 Unbonded Area

Claims (8)

A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet,
Between the top sheet and the absorber, an apertured film having a plurality of funnel-shaped apertures is arranged, and between the absorber and the apertured film, an absorbent cover sheet is disposed. A sex article,
When the hot melt adhesive is applied to the skin-contacting surface of the apertured film and is subjected to an adhesive treatment with the upper layer portion, the adhesion area ratio of the skin-contacting surface of the apertured film is 10% or more and 50% or less. The upper layer is the top sheet,
When the hot melt adhesive is applied to the skin non-contact surface of the perforated film and is subjected to an adhesive treatment with the absorbent cover sheet, in the perforated film and the absorbent cover sheet, the width of the absorbent article In the central part of the direction, there is an unbonded area with a width of 15 mm or more,
An absorbent article, wherein the open area ratio of the open film is 25% or more and 50% or less. Between the top sheet and the apertured film, a liquid diffusing second sheet is arranged,
The absorbent article according to claim 1, wherein the upper layer portion is the second sheet. The absorbent article according to claim 1 or 2, wherein the absorbent body covering sheet is made of pulp. The absorbent article according to any one of claims 1 to 3, wherein the top sheet and/or the second sheet is an air-through nonwoven fabric. The absorbent article according to any one of claims 2 to 4, wherein a ratio of the basis weight of the top sheet to the second sheet is 50% or more and 130% or less. The absorber contains fluff pulp and a superabsorbent polymer,
The absorbent article according to any one of claims 1 to 5, wherein a ratio of the weight of the superabsorbent polymer to the weight of the entire absorbent body is 40% or more. The aperture diameter of the aperture film is 2 mm or less, the number of apertures is 50/cm ² or more, and the basis weight is 20 g/m ² or more and 60 g/m ² or less, The absorbent article according to any one of 1 to 6. The apertured film has a small aperture diameter on one surface in the thickness direction, and is provided with an aperture diameter on the other surface that is large,
The difference between the opening diameter of the one surface having the large opening diameter and the opening diameter of the other surface having the small opening diameter is 0.03 mm or more and 0.15 mm or less, wherein The absorbent article according to any one of claims.

Images