JP2021016465A - Absorbent article - Google Patents

Abstract

To provide an absorber excellent in absorbency and wear feelings which does not contain fluff pulp, and an absorbent article provided with the absorber.SOLUTION: An absorbent article includes a liquid permeable top sheet, a liquid impermeable back sheet arranged opposite the top sheet, and an absorber arranged between the top sheet and the back sheet. The absorber is provided with: a substrate non-woven fabric whose surface is raised; a high absorbency sheet equipped with a high absorbency polymer fixed and carried between fibers of the part where the substrate non-woven fabric is raised; and a hydrophilic sheet covering the raised surface of the high absorbency sheet. In the absorbent article, thickness of the absorber measured under load 35 g/cm2 is between 1.0 mm and 4.0 mm and between 30% and 70% of thickness measured in a non-load state.SELECTED DRAWING: Figure 3

Description

The present invention relates to absorbent articles.

In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, whereby urine and the like are formed. The body fluid is absorbed by the absorber through the top sheet. There are various types of these absorbent products, whether for adults or infants, depending on the application, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads. Exists.

For the absorbents constituting these absorbent articles, it was common to use fluff pulp and a super absorbent polymer (also referred to as SAP) in combination, but the wearing feeling, appearance and touch when worn. A so-called superabsorbent sheet (also referred to as SAP sheet), which is composed of a non-woven fabric as a base and a superabsorbent polymer, may be used as an absorber for the purpose of improving the above and reducing the reversion of urine. Various studies have been made on.

As highly absorbent sheets that have been studied so far, for example, in Patent Document 1, a first sheet and a second sheet coated with an adhesive and a highly absorbent sheet arranged between the first sheet and the second sheet With the sex polymer, the application of the adhesive at least at the sites corresponding to the multiple regions on the second sheet is intermittent and opposes the first sheet on both sides of the highly absorbent polymer in the width direction. A highly absorbent sheet is disclosed characterized in that the adhesive is continuously applied to the site in the longitudinal direction and the highly absorbent polymer is arranged in stripes along the longitudinal direction.

Further, Patent Document 2 discloses an absorber in which a highly absorbent sheet is arranged in a bent state in a region where the highly absorbent polymer does not exist.

Further, Patent Document 3 discloses an absorber in which two highly absorbent sheets are bent along a longitudinal direction and two highly absorbent sheets are arranged so that the folds face each other.
Further, Patent Document 4 discloses an absorber in which at least one of two substrate nonwoven fabrics is fluffed and a highly absorbent sheet in which a highly absorbent polymer is fixedly held is arranged between the two sheets. ing.

Japanese Unexamined Patent Publication No. 2006-158676 Japanese Unexamined Patent Publication No. 2010-88529 Japanese Unexamined Patent Publication No. 2013-42882 Japanese Unexamined Patent Publication No. 2019-4208

However, in Patent Document 1 and many other highly absorbent sheets, since the substrate non-woven fabric and the highly absorbent polymer are fixed by using a hot melt adhesive, the feeling of wearing is deteriorated due to the hardness of the skin, and the fit is also reduced. There was a problem that a feeling of strangeness was caused because the sex could not be obtained. Further, as compared with the conventional absorber composed of fluff pulp and a highly absorbent polymer, most of the highly absorbent sheets are highly absorbent polymers because the highly absorbent polymer is fixed to the base non-woven fabric by an adhesive means. Because of the high density of pulp, the absorption time is long and the diffusivity of urine is inferior, so that the absorption is not sufficiently satisfactory.

Further, although the highly absorbent sheet described in Patent Document 2 has the above-mentioned structure to prevent leakage of the highly absorbent polymer, it is similar to the highly absorbent sheet described in Patent Document 1. , The texture, fit, absorbency, etc. were not fully satisfactory.

Further, in the highly absorbent sheet described in Patent Document 3, although the fit to the crotch is improved by having the above-mentioned structure, the point that the high-absorbent sheet is hard to the touch is improved. It was not, and I was not fully satisfied with the feeling of wearing it. Further, as with the highly absorbent sheets described in Patent Documents 1 and 2, the absorbency was not sufficiently satisfactory.
Similarly, in the high-absorbency sheet described in Patent Document 4, although the high-absorbency polymer has excellent retention due to having the above-mentioned structure, the point that the high-absorbency sheet is hard to the touch is improved. No, I was not fully satisfied with the feeling of wearing. Further, as with the highly absorbent sheets described in Patent Documents 1, 2 and 3, the absorbency was not sufficiently satisfactory.

As described above, the absorbers described in Patent Documents 1, 2, 3 and 4 and the absorbent articles using the absorbers did not sufficiently satisfy both the absorbency and the wearing feeling. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent body that does not contain fluff pulp and has good absorbency and wearing feeling, and an absorbent article having the absorbent body. And.

The inventor of the present invention has conducted diligent research in view of the above problems. As a result, they have found that the above problems can be solved by devising the mode of the non-woven fabric as the substrate and the method of supporting the highly absorbent polymer, and further setting the thickness of the absorber within a predetermined range, and complete the present invention. I came to do it. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is between a liquid-permeable top sheet, a liquid-impermeable back sheet arranged to face the top sheet, and between the top sheet and the back sheet. An absorbent article comprising an arranged absorber, the absorber comprising a substrate nonwoven fabric with a brushed surface and a highly absorbent polymer fixed and supported between fibers in the brushed portion of the substrate nonwoven fabric. A highly absorbent sheet and a hydrophilic sheet covering the raised surface of the highly absorbent sheet are provided, and the thickness of the absorber is 1.0 mm or more as measured under a load of 35 g / cm ^2. The absorbent article is 4.0 mm or less, and the thickness measured under the load of 35 g / cm ² is 30% or more and 70% or less of the thickness measured under no load. ..

(2) The second aspect of the present invention is the absorbent article according to (1), in which the absorbent body has two highly absorbent sheets, each of which has a raised surface facing outward. It is characterized in that each of the raised surfaces is covered with two hydrophilic sheets, respectively.

(3) A third aspect of the present invention is the absorbent article according to (1), wherein the absorbent body covers one high-absorbent sheet and its raised surface. It is characterized in that the sex sheet is folded in half along a fold line parallel to the longitudinal direction so that the raised surface faces outward.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the substrate nonwoven fabric is an air-through nonwoven fabric and has a basis weight of 20 g / m ² or more. The thickness is 120 g / m ² or less, the thickness measured under a load of 35 g / cm ² is 0.1 mm or more and 3.5 mm or less, and the thickness of the fibers constituting the substrate nonwoven fabric is 1.6 dtex or more and 14 dtex or less. It is characterized by being.

(5) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the highly absorbent polymer has a basis weight of 150 g / m ² or more and 1000 g / m. It is characterized by being ² or less.

(6) A sixth aspect of the present invention is the absorbent article according to any one of (1) to (5), wherein the hydrophilic sheet has a basis weight of 7 g / m ² or more and 45 g / m. It is characterized by being a hydrophilic non-woven fabric or tissue paper of ² or less.

(7) A seventh aspect of the present invention is the absorbent article according to any one of (1) to (6), wherein the highly absorbent polymer is used as a hot melt adhesive to form the substrate nonwoven fabric. It is fixedly supported between the fibers of the raised portion, and is characterized in that the content of the hot melt adhesive is 10 g / m ² or less.

Therefore, according to the present invention, it is possible to provide an absorbent body that does not contain fluff pulp and has good absorbency and wearing feeling, and an absorbent article having the absorbent body.

It is a perspective view of the substrate nonwoven fabric used for the absorber of this invention. It is a cross-sectional view in the width direction of the highly absorbent sheet used for the absorber of this invention. It is sectional drawing in the width direction of the absorber of this invention. It is sectional drawing in the width direction of the absorber of this invention of another aspect. It is a top view of the absorbent article of this invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings, but these are listed for exemplification purposes and do not limit the present invention. Absent. The same elements are designated by the same reference numerals throughout the description of the embodiments.

(Base non-woven fabric)
FIG. 1 is a perspective view of the substrate nonwoven fabric 11 used for the absorber 1 of the present invention. As shown in FIG. 1, one side surface of the substrate nonwoven fabric 11 is in a raised state. Therefore, in addition to the original bulkiness of the non-woven fabric, by imparting an appropriate thickness and softness to the highly absorbent sheet 10, an appropriate cushioning property can be generated and a fit feeling at the time of wearing can be improved. Further, by raising the base nonwoven fabric 11 as described above, the highly absorbent polymer 12 can be dispersed and fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11. Examples of the method of raising one side surface of the substrate nonwoven fabric 11 include a rotary saw blade and a needle punch, and it is preferable to use a method of raising the brush with a rotary saw blade from the viewpoint of in-line productivity and cost.

Examples of the substrate non-woven fabric 11 include non-woven fabrics such as air-through non-woven fabric, point-bonded non-woven fabric, spunbond non-woven fabric, and melt-blow non-woven fabric, and composite non-woven fabric in which spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric are laminated. be able to. Of these non-woven fabrics, it is preferable to use an air-through non-woven fabric that is easily bulky.

The thickness of the substrate nonwoven fabric 11 is preferably 0.3 mm or more and 11.0 mm or less, more preferably 2.0 mm or more and 9.0 mm or less, from the viewpoint of the balance between wearing feeling and absorption performance. It is more preferably 0 mm or more and 9.0 mm or less. Further, the thickness of the substrate nonwoven fabric 11 measured under a load of 35 g / cm ² is preferably 0.1 mm or more and 3.5 mm or less, and more preferably 0.1 mm or more and 2.0 mm or less.
The basis weight of the substrate nonwoven fabric 11 is preferably 20 g / m ² or more and 120 g / m ² or less, and more preferably 40 g / m ² or more and 100 g / m ² or less.

Further, the thickness of the fibers constituting the substrate nonwoven fabric 11 is preferably 1.6 dtex or more and 14 dtex or less, more preferably 1.8 dtex or more and 9.0 dtex or less, and 2.0 dtex or more and 6.0 dtex or less. It is more preferable to have. By adjusting the thickness of the fibers constituting the base nonwoven fabric 11 in the above range in this way, the highly absorbent polymer 12 can be dispersed between the fibers of the raised portion of the substrate nonwoven fabric 11 to facilitate sticking and supporting. it can.

(Highly absorbent sheet)
FIG. 2 is a cross-sectional view in the width direction of the highly absorbent sheet 10 used for the absorber 1 of the present invention. As shown in FIG. 2, the highly absorbent sheet 10 used for the absorber 1 of the present invention has high absorbency that is fixedly supported between the base nonwoven fabric 11 having a raised surface on one side and the fibers of the raised portion of the substrate nonwoven fabric 11. It has a polymer 12 and. The highly absorbent polymer 12 is dispersed and fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11, whereby urine is appropriately diffused or held in the substrate nonwoven fabric 11 around the highly absorbent polymer 12. The absorption performance is improved, and sufficient absorption performance can be ensured without having fluff pulp.

(Highly absorbent polymer)
The highly absorbent polymer 12 is not particularly limited as long as it can absorb urine and prevent backflow, and is a sodium polyacrylate-based, polyasparaginate-based, or (starch-acrylic acid) graft copolymer. , (Acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and those formed from materials such as saponified products thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. Further, the basis weight of the highly absorbent polymer 12 is preferably 150 g / m ² or more and 1000 g / m ² or less in order to secure the absorption performance required for various absorbent articles. Further, from the viewpoint of further improving the absorption performance, the feel after absorption, and the ease of movement of the wearer, the basis weight of the highly absorbent polymer 12 is more preferably 200 g / m ² or more and 700 g / m ² or less.

Further, from the viewpoint of improving the basic performance regarding absorption by avoiding fine powder having poor fluidity as a powder and reducing the rugged tactile sensation generated by the hardening of the highly absorbent sheet 10, high absorption is achieved. The medium particle size of the sex polymer 12 is preferably 50 μm or more and 600 μm or less, and more preferably 100 μm or more and 500 μm or less.

The highly absorbent polymer 12 is preferably fixedly supported between the fibers of the raised portion of the base nonwoven fabric 11 by a hot melt adhesive, and when the basis weight of the substrate nonwoven fabric 11 is relatively low, the highly absorbent polymer 12 is used. The hot melt adhesive works particularly well to reinforce the fixation bearing of 12. The content of the hot melt adhesive is preferably 10 g / m ² or less so as not to impair the absorbency of the highly absorbent polymer 12 and not to impair the feel when worn. As the hot melt adhesive, a synthetic rubber-based copolymer such as a styrene-butadiene-styrene-based copolymer or a styrene-isoprene-styrene-based copolymer having a melting point of 100 ° C. or higher and 180 ° C. or lower, or an ethylene-vinyl acetate copolymer. Styrene-based hot melt adhesives such as the above can be used. As a method for applying the hot melt adhesive, known methods such as a curtain coating method in which a hot melt adhesive in a molten state is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which a hot melt adhesive is applied by a contact method can be used.

<Absorbent>
The absorber 1 according to the embodiment of the present invention is particularly limited to a tape-type disposable diaper, a pants-type disposable diaper, a urine absorbing pad, a light incontinence pad, etc., regardless of whether it is for adults or infants. It can be used for various absorbent articles depending on the application. In the description of the present specification, the longitudinal direction of the absorber 1 is a direction extending in front of and behind the wearer when worn, and is a direction indicated by reference numeral Y in the drawing. Further, the width direction of the absorber 1 is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by X in the drawing. Further, in the present specification, the body-side surface of the absorber 1 refers to a surface that comes into contact with the wearer's skin when worn, and the clothing-side surface refers to a surface that comes into contact with the wearer's clothing when worn. Further, the thickness direction of the absorber 1 is indicated by Z in the figure.

FIG. 3 is a cross-sectional view in the width direction of the absorber 1 of the present invention, and FIG. 4 is a cross-sectional view in the width direction of the absorber 1 of another aspect. In the absorber 1 of the present invention, as shown in FIG. 3, two highly absorbent sheets 10 are laminated so that their raised surfaces face outward, and each raised surface is formed on the two raised surfaces described later. Each is covered with a hydrophilic sheet 20 (that is, two sets of a highly absorbent sheet 10 and a set of the hydrophilic sheet 20 covering the high absorbent sheet 10 are prepared so that the non-raised surfaces of the high absorbent sheet 10 face each other. (Laminate in) is preferable. Alternatively, as shown in FIG. 4, one highly absorbent sheet 10 and one hydrophilic sheet 20 covering the raised surface thereof are formed by two fold lines parallel to the longitudinal direction so that the raised surface faces outward. It is preferably folded in half.

In the absorber 1 of the present invention, if the substrate nonwoven fabric 11 is sufficiently raised in order to retain the highly absorbent polymer 12 of the absorber 1, the liquid diffusing power of the substrate nonwoven fabric 11 becomes low, but the substrate nonwoven fabric 11 Since two sheets are present in the thickness direction of the absorber 1, the liquid diffusing force can be sufficiently exerted even if the absorbent body 1 is raised, and the absorption performance of the absorber 1 becomes good. Further, since the highly absorbent polymer 12 is present in both the upper part and the lower part of the absorber 1 in the thickness direction, compared with the case where the highly absorbent polymer 12 is present in a high density only in a part in the thickness direction. It feels good on the skin and feels good to wear. Further, since the highly absorbent polymer 12 is present in both the upper part and the lower part of the absorber 1 in the thickness direction, compared with the case where the highly absorbent polymer 12 is present in a high density only in a part in the thickness direction. Therefore, the deterioration of the liquid diffusivity due to the expansion of the absorber 1 after the absorption of the body fluid is suppressed, and the absorption performance at the time of repeated absorption (assuming the second and subsequent urination) is excellent.

(Hydrophilic sheet)
As shown in FIG. 3, the absorber 1 of the present invention has a hydrophilic sheet 20 that adheres to the raised surface of the highly absorbent sheet 10. By adhering the raised surface of the highly absorbent sheet 10 to the hydrophilic sheet 20, it is possible to prevent the highly absorbent polymer 12 from leaking to the outside of the absorbent body 1, and it is possible to improve the feel when worn. .. Examples of the hydrophilic sheet 20 include hydrophilic non-woven fabrics such as tissue paper, absorbent paper, spunbonded non-woven fabric and air-laid non-woven fabric. From the viewpoint of availability and cost, it is preferable to use hydrophilic non-woven fabric or tissue paper, and hydrophilicity is used. The basis weight of the sex sheet 20 is preferably 7 g / m ² or more and 45 g / m ² or less, and more preferably 8 g / m ² or more and 15 / m ² or less. When the raised surface of the highly absorbent sheet 10 is adhered to the hydrophilic sheet 20, it is preferable to fix the highly absorbent sheet 10 and the hydrophilic sheet 20 by hot melt adhesive or heat embossing.

The thickness of the absorber 1 of the present invention is preferably 1.0 mm or more and 4.0 mm or less, preferably 1.0 mm or more and 3.0 mm or less, as measured under a load of 35 g / cm ² . By setting the thickness of the absorber 1 under a load of 35 g / m ² within the above numerical range, it is possible to improve the wearing feeling of the absorbent article 50 described later provided with the absorber 1. The thickness of the absorber 1 at this time is the total thickness of the substrate nonwoven fabric 11 in which the highly absorbent polymer 12 is fixedly supported on the raised surface and the hydrophilic sheet 20 adhered to the raised surface of the substrate nonwoven fabric 11. Means that.
Further, the thickness of the absorber 1 measured under a load of 35 g / cm ² is 30% or more and 70% or less, and preferably 35% or more and 60% or less of the thickness measured under no load. By setting the thickness ratio within the above numerical range, it is possible to improve the wearing feeling of the absorbent article 50 described later, which includes the absorber 1.

<Manufacturing method of absorber>
The method for producing the absorber 1 is not particularly limited, and examples thereof include the following methods. The surface of one side of the substrate nonwoven fabric 11 is raised using a rotary saw blade or a needle punch.
Then, the highly absorbent polymer 12 is fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric 11 with a hot melt adhesive or the like. Then, the raised surface side of the substrate nonwoven fabric 11 and the hydrophilic sheet 20 are adhered with a hot melt adhesive or the like to obtain a highly absorbent sheet 10. Two sets of the highly absorbent sheets 10 are prepared and laminated so that the non-raised surfaces of the high-absorbent sheets 10 face each other, or one high-absorbent sheet 10 and one sheet covering the raised surface thereof. Absorbent 1 is obtained by folding the hydrophilic sheet 20 in half along a fold line parallel to the longitudinal direction so that the raised surface faces outward.

<Absorbable article>
Another embodiment of the present invention is the absorbent article 50 comprising the absorber 1 of the present invention. Examples of the absorbent article 50 include various types depending on the application, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads, regardless of whether they are for adults or infants. ..
FIG. 5 is a plan view of the absorbent article 50 of the present invention. As shown in FIG. 5, the absorbent article 50 of the present invention includes a liquid-permeable top sheet 25 arranged on the body side and a liquid-impermeable back sheet 30 arranged facing the top sheet 25. The absorber 1 is arranged between the top sheet 25 and the back sheet 30, and a pair of three-dimensional gathers 40 are arranged on the upper part of the top sheet 25. As a result, the absorber 1 has a structure sandwiched between the top sheet 25 and the back sheet 30, and body fluid such as urine is absorbed by the absorber 1 through the top sheet 25. In addition, leg gathers, waist gathers, side flaps and the like can be appropriately provided depending on the use and type of the absorbent article 50.

(Top sheet)
The top sheet 25 allows the body fluid to quickly pass toward the absorber 1 and is arranged so as to face the back sheet 30 with the absorber 1 interposed therebetween. Since the top sheet 25 is a sheet that comes into contact with the skin, the top sheet 25 has a property of having a soft feel and not irritating the skin, and is made of synthetic fibers such as polypropylene and polyethylene, and recycled rayon and the like. A hydrophilic non-woven fabric obtained by a known processing method such as an air-through method, a thermal bond method, a spunlace method, or a spunbond method using natural fibers such as fibers and cotton, or a composite non-woven fabric obtained by laminating these, an open polyethylene film. An open film such as, a foamed film such as urethane foam, or the like can be used. Further, the surface of the top sheet 25 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 25 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 25 is preferably 15 g / m ² or more and 200 g / m ² or less. The shape of the top sheet 25 is not particularly limited, but may be any shape that covers the absorber 1 that is required to guide the body fluid to the absorber 1 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 1 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 spunbonded non-woven fabric, a melt-blown non-woven fabric, a spunbonded non-woven fabric / melt-blow non-woven fabric, a composite non-woven fabric in which spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric is laminated, and these Examples include composite materials. 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 40 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 for perforation. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Manufacturing method of absorbent articles>
As a method for manufacturing the absorbent article 50, the absorber 1 obtained as described above is sandwiched between the top sheet 25 and the back sheet 30, and the three-dimensional gathers 40 are installed on the top sheet 25 to form a top. It can be manufactured by fixing the sheet 25 and the back sheet 30 with a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, or the like over a part or the entire circumference. When the absorbent article 50 is a urine absorbing pad or a light incontinence pad, it may be individually wrapped in a package and then folded in three in the longitudinal direction. In addition, leg gathers, waist gathers, side flaps and the like can be provided as needed.

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 of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. 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.

<Making absorbent articles>
First, an air-through non-woven fabric of a substrate non-woven fabric (basis weight 40 g / m ² , width direction dimension 60 mm, longitudinal dimension 400 mm) is prepared, and one side surface of the substrate non-woven fabric is physically brushed with a rotary saw blade to achieve high absorption. A sex polymer (basis weight 500 g / m ² ) was dispersed, and the highly absorbent polymer was fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric with a hot melt adhesive. Further, a spunbonded non-woven fabric (basis weight 10 g / m ² , width direction dimension 60 mm, longitudinal dimension 400 mm) was prepared as a hydrophilic sheet, and the raised surface side of the base non-woven fabric and the hydrophilicity to which a hot melt adhesive was applied were applied. A highly absorbent sheet was obtained by adhering to the sheet. Two sets (two sheets) of this highly absorbent sheet were prepared.
Next, as an absorbent body, one set of highly absorbent sheets is arranged so that the raised surface faces the top sheet side (skin contact surface side), and another set of highly absorbent sheets is placed under the raised surface. Two layers are used so that the back sheet faces the back sheet side, an air-through non-woven fabric (basis weight 25 g / m ² ) is used as the top sheet, and a breathable polyethylene sheet (basis weight 32 g) is used as the liquid-impermeable back sheet. / M ² ) was used, and as a three-dimensional gather, a composite non-woven fabric (basis weight 15 g / m ² ) in which spunbond / melt blown / spunbond was laminated was used to prepare an absorbent article. This was used as a sample of Example 1.
In Example 2, a base non-woven fabric and a hydrophilic sheet having a width direction dimension of 120 mm and a longitudinal direction dimension of 400 mm were prepared, and a highly absorbent sheet was prepared in the same manner as in Example 1, and the completed high absorbency was completed. The absorbent body is the same as in Example 1 except that the sheet is folded in half along a line parallel to the longitudinal direction so that the dimension in the width direction is 60 mm and the raised surface faces outward and used as the absorbent body. And an absorbent article was prepared and used as a sample of Example 2.

In Comparative Example 1, the basis weight of the highly absorbent polymer was dispersed at 700 g / m ² , and one set of highly absorbent sheets was obtained in the same manner as in Example 1. The absorber and the absorber and the same as in Example 1 except that only one set of this highly absorbent sheet was prepared and used as an absorber with the raised surface facing down (back sheet side) without being stacked or folded. An absorbent article was prepared and used as a sample of Comparative Example 1.
Further, in Comparative Example 2, an air-through nonwoven fabric of a substrate nonwoven fabric (basis weight 90 g / m ² , width direction dimension 60 mm, longitudinal dimension 400 mm) was prepared, and both surfaces of the substrate nonwoven fabric were physically brushed with a saw blade. The highly absorbent polymer is dispersed on one side at a basis weight of 500 g / m ² and on the other side at a basis weight of 500 g / m ² , and the highly absorbent polymer is applied to the raised portion of the substrate non-woven fabric by a hot melt adhesive. It was fixedly supported between the fibers of. Further, a spunbonded non-woven fabric (basis weight 10 g / m ² , width direction dimension 60 mm, longitudinal dimension 400 mm) was prepared as a hydrophilic sheet, and the raised surface side of the base non-woven fabric and the hydrophilicity to which a hot melt adhesive was applied were applied. A highly absorbent sheet was obtained by adhering to the sheet. An absorbent article was prepared in the same manner as in Example 1 except that this highly absorbent sheet was used as an absorber with the raised surface on the lower side (back sheet side), and used as a sample of Comparative Example 2.

In Comparative Example 3, the absorbent body and the absorbent article were used in the same manner as in Example 1 except that two sets of highly absorbent sheets were used so that the raised surface was inward (upper layer facing downward and lower layer facing upward). It was prepared and used as a sample of Comparative Example 3.
In Comparative Example 4, the air-through non-woven fabric (basis weight 20 g / m ² ) / highly absorbent polymer (basis weight 280 g / m ² ) / air-through non-woven fabric (basis weight 20 g / m ² ) / high-absorbent polymer (basis weight 100 g / m) ² ) / The same as in Example 1 except that a sheet (all dimensions in the width direction are 60 mm and all dimensions in the longitudinal direction are 400 mm) laminated with a spunlace non-woven fabric (basis weight 20 g / m ² ) is used as an absorber. An absorbent article was prepared and used as a sample of Comparative Example 4.

Further, the absorber those covered in Comparative Example 5, the superabsorbent polymer (basis weight 380 g / ^{m 2)} and fluff pulp (basis weight 400 g / ^{m 2)} tissue of a mixture of paper (16g / ^{m 2)} An absorbent article was prepared in the same manner as in Example 1 except that it was used as a sample of Comparative Example 5. The non-woven fabric used in Comparative Example 5 was not brushed like the substrate non-woven fabric 11 used in Example 1.

[Measurement item]
Using the absorbent article obtained as described above, the following absorption rate, reversion amount and thickness of the absorber were measured, and the results are shown in Table 1.

(Absorption rate)
40 ml of 0.9% by mass physiological saline (37 ° C.) was poured from a cylinder having an inner diameter of 30 mm under a pressure of 46 g / cm ² on the absorbent articles of each Example and each Comparative Example. The time (seconds) until the physiological saline was absorbed on the surface of the absorber was measured as the first absorption rate. After 3 minutes had passed, 40 ml of 0.9% by mass physiological saline (37 ° C.) was injected again, and the time (seconds) until the physiological saline was absorbed on the surface of the absorber was measured as the second absorption rate. .. The smaller the value, the better the absorbency.

(Amount of reversion)
200 ml of physiological saline is poured into the absorbent articles of each example and each comparative example, and 10 minutes after the water injection, the filter paper is pressure-bonded to the surface of the absorber with a load of 35 gf / cm ² , and the filter paper returns to the filter paper in 1 minute. The amount of water was measured. The smaller the amount of reversion, the drier the absorber.

(Thickness of absorber)
The thickness of the absorbers of each Example and each Comparative Example was measured when no pressure was applied (no load state) and when a predetermined load (35 g / cm ^{2 in this case} ) was applied. The thickness under a load of 35 g / cm ² is obtained as a value obtained by subtracting the height of the predetermined position of the weight itself from the height of the predetermined position of the weight with the weight placed on the absorber.

(sensory evaluation)
With the cooperation of eight panelists, when the absorbent articles of each example and each comparative example are worn, the wearing feeling (fitness, softness) and the absorbency (leakage to the outside of the absorbent articles, smooth feeling) ), A sensory evaluation was performed with two choices, "good" or "bad". The wearer used it for 8 hours and evaluated it in daily activities, and the results are shown in Table 1.
〇: When the number of wearers who chose "good" is 6 or more and 8 or less △: When the number of wearers who chose "good" is 3 or more and 5 or less ×: 1 wearer who chose "good" When there are one or two people, or when there is no wearer who chose "good"

In Example 1 in which the raised surface was turned to the outside and two layers were folded in half, and Example 2 in which the two sheets were folded in half, the softness, the fit, the leakiness, and the silky feeling were all good. On the other hand, Comparative Examples 1 and 2 using only one highly absorbent sheet were inferior in softness and fit, and Comparative Example 1 also leaked to the outside of the absorbent article. Comparative Example 3 in which two sheets were stacked with the brushed surface inside was inferior in softness and silky feeling. Further, Comparative Example 4 in which the non-woven fabric and the highly absorbent polymer were laminated was significantly inferior in softness and fit, and Comparative Example 5 in which the highly absorbent polymer and fluff pulp were mixed was inferior in the silky feel.
From the above, according to the absorbent article of the present invention, it is possible to provide an absorbent which does not contain fluff pulp and has good absorbency and wearing feeling, and an absorbent article having the absorbent.

1 Absorbent 10 Highly absorbent sheet 11 Base non-woven fabric 12 Highly absorbent polymer 20 Hydrophilic sheet 25 Top sheet 30 Back sheet 40 Three-dimensional gather 50 Absorbent article

Claims (7)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet arranged to face the top sheet, and an absorber arranged between the top sheet and the back sheet. And
The absorber comprises a highly absorbent sheet comprising a base nonwoven fabric having a raised surface and a highly absorbent polymer fixedly supported between fibers of the raised portion of the substrate nonwoven fabric, and a raised surface of the highly absorbent sheet. With a hydrophilic sheet to cover,
The thickness of the absorber, is not less 1.0mm or more 4.0mm or less in thickness measured under a load of 35 g / cm ^2, the thickness was measured under a load of the 35 g / cm ² is no load An absorbent article characterized in that it is 30% or more and 70% or less of the thickness measured in 1. The absorber is formed by stacking two highly absorbent sheets so that their raised surfaces face outward, and covering each of the raised surfaces with the two hydrophilic sheets. The absorbent article according to claim 1. The absorber folds one highly absorbent sheet and one hydrophilic sheet covering the raised surface thereof in half with a folding line parallel to the longitudinal direction so that the raised surface faces outward. The absorbent article according to claim 1, wherein the product is. The substrate non-woven fabric is an air-through non-woven fabric, the basis weight is 20 g / m ² or more and 120 g / m ² or less, and the thickness measured under a load of 35 g / cm ² is 0.1 mm or more and 3.5 mm or less. The absorbent article according to any one of claims 1 to 3, wherein the thickness of the fibers constituting the substrate nonwoven fabric is 1.6 dtex or more and 14 dtex or less. The absorbent article according to any one of claims 1 to 4, wherein the highly absorbent polymer has a basis weight of 150 g / m ² or more and 1000 g / m ² or less. The absorbent article according to any one of claims 1 to 5, wherein the hydrophilic sheet is a hydrophilic non-woven fabric or tissue paper having a basis weight of 7 g / m ² or more and 45 g / m ² or less. .. The highly absorbent polymer is fixedly supported between the fibers of the raised portion of the substrate nonwoven fabric by a hot melt adhesive, and the content of the hot melt adhesive is 10 g / m ² or less. The absorbent article according to any one of claims 1 to 6.