JP2021065585A - Absorbent article - Google Patents

Abstract

To provide an absorbent article that is further improved in diffusibility of body fluid and an absorption rate of the body fluid.SOLUTION: An absorbent article 1 includes: a liquid permeable top sheet 10; a non-liquid permeable back sheet 13; an absorber 12 disposed between the top sheet 10 and the back sheet 13; and a second sheet 11 disposed between the top sheet 10 and the absorber 12. The second sheet 11 includes: a spunbonded nonwoven fabric; and a wood pulp layer integrated with at least one surface of the spunbonded nonwoven fabric, where a surface of the spunbonded nonwoven fabric is disposed so as to face the top sheet 10, and is a pulp-containing nonwoven fabric including an irregularity part in at least a part of the surface facing the top sheet 10 of the spunbonded nonwoven fabric.SELECTED DRAWING: Figure 1

Description

The present invention relates to an absorbent article.

Adult disposable diapers generally include a tape stopper type, a pants type, a urine absorbing pad, and the like, and these disposable diapers are appropriately selected and used according to the need for long-term care in excretion of the wearable person. These absorbent articles are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the two sheets. By adopting such a configuration, body fluids such as urine permeate through the top sheet of the absorbent article and are absorbed by the absorber, and are prevented from leaking to the outside by the back sheet.

In addition to preventing leakage, these absorbent articles are basically required to quickly absorb body fluids such as urine and to have little liquid return. For this reason, a technique is adopted in which an air-through non-woven fabric made of a thermoplastic resin fiber is interposed between the top sheet and the absorber as a second sheet, or a slit or emboss is provided in the absorber.

In Patent Document 1, a sheet composed of a polyurethane continuous porous body is used as a second sheet, and body fluids such as urine taken into the second sheet quickly permeate and diffuse in the thickness direction, thereby improving the absorption rate. Absorbent articles are disclosed.

Patent Document 2 provides a liquid-retaining absorbent core and an absorbent core for the purpose of providing an absorbent article having an absorber having a high rate of absorbing body fluid such as urine and excellent shape retention. The core wrap sheet is a non-woven fabric, particularly an SMS (spunbond-melt blown-spunbond) non-woven fabric, which has an improved absorption rate of body fluids such as urine, and the absorber. Absorbent articles to be provided are disclosed.

JP-A-2017-164356 Japanese Unexamined Patent Publication No. 2019-103789

In Patent Document 1, since the second sheet is made of polyurethane, there is a problem that it is easy to get stuffy when worn on the body and the diffusion of body fluid in the plane direction is poor. Further, in Patent Document 2, since the core wrap sheet covering the absorbent core is an SMS non-woven fabric, a water permeation treatment is required, and there is a problem that the absorption rate deteriorates when the liquid is repeatedly received. Further, in both the absorbent articles of Patent Documents 1 and 2, by providing a second sheet between the top sheet and the absorber, the performance such as absorbability, diffusibility, and absorption rate for body fluids such as urine is improved. It has become the one that was done. However, absorbent articles are required to have further improved performance.

An object of the present invention is to provide an absorbent article having further improved diffusivity of body fluid and absorption rate.

The present inventor has conducted diligent research in view of the above problems. As a result, in the absorbent article, the above problem can be solved by providing a pulp-containing non-woven fabric in which pulp fiber webs are laminated and integrated on a spunbonded non-woven fabric as a second sheet between the top sheet and the absorbent body. The heading has led to the completion of the present invention.

The present invention provides, for example, the following absorbent articles (1) to (12) as preferred embodiments.
(1) A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber arranged between the top sheet and the back sheet, and arranged between the top sheet and the absorbent body. An absorbent article comprising the spunbonded non-woven fabric, wherein the second sheet comprises a spunbonded nonwoven fabric and a wood pulp layer integrated on at least one surface of the non-woven fabric of the spunbonded nonwoven fabric. An absorbent article characterized in that the surface is arranged so as to face the top sheet, and the spunbonded non-woven fabric is a pulp-containing non-woven fabric having uneven portions on at least a part of the surface of the spunbonded non-woven fabric facing the top sheet.
(2) The absorbent article of (1) above, wherein the pulp-containing non-woven fabric has the uneven portion on the entire surface of the surface facing the top sheet.
(3) The absorbent article according to (1) or (2) above, wherein the absorber has at least one slit extending in the longitudinal direction and / or the width direction thereof.
(4) The absorbent article according to (3) above, wherein the width of the slit is 10 mm or more and 40 mm or less, and the length of the slit is 150 mm or more and 300 mm or less.
(5) The pattern shape of the uneven portion is a pattern in which a grid pattern, a wavy shape, an Aicon pattern shape, a polka dot pattern, a scale pattern, a checkered pattern, or a plurality of polygons are arranged vertically and horizontally at equal intervals from each other. , The absorbent article according to any one of (1) to (4) above.
(6) The depth of the concave portion in the uneven portion is 0.2 mm or more and 3.0 mm or less, the area of the concave portion is 1.0 mm ² or more and 25 mm ² or less, and the distance between the concave portions in the uneven portion is , 0.3 mm or more and 1.0 mm or less, the absorbent article according to any one of (1) to (5) above.
(7) The absorbent article according to any one of (1) to (6) above, wherein the pulp-containing nonwoven fabric is a water-flow entangled integrated product of the spunbonded nonwoven fabric and the wood pulp layer.
(8) In the water flow entanglement integrated product, at least a part of the wood pulp fibers are entangled with the fibers constituting the spunbonded non-woven fabric and / or other wood pulp fibers and fixed to one surface of the spunpond non-woven fabric. The absorbent article according to (7) above, which comprises a wood pulp layer and wood pulp fibers exposed outward from the other surface of the spunbonded nonwoven fabric.
(9) The absorbent article according to any one of (1) to (8) above, wherein the spunbonded non-woven fabric is a spunbonded non-woven fabric made of polypropylene.
(10) The absorbent article according to any one of (1) to (9) above, wherein the content of wood pulp in the pulp-containing non-woven fabric is 65% by mass or more and 90% by mass or less.
(11) The absorbent article according to any one of (1) to (10) above, wherein the thickness of the pulp-containing nonwoven fabric is 0.25 mm or more and 0.50 mm or less.
(12) The absorbent article according to any one of (1) to (11) above, wherein the pulp-containing non-woven fabric has a basis weight of 40 g / m ² or more and 80 g / m ^{2 or less.}

According to the present invention, there is provided an absorbent article having further improved diffusivity of body fluid and absorption rate and thus absorbability.

It is a top view which shows typically the structure of the absorbent article which is 1st Embodiment of this invention. Is a schematic cross-sectional view in X ₁ -X ₁ cutting line of the absorbent article shown in FIG. It is a cross-sectional view in the width direction which shows typically the structure of the absorbent article which is another embodiment. It is a perspective view which shows typically the appearance composition of the pulp-containing non-woven fabric. It is a schematic plan view which shows the skin side surface of the pulp-containing non-woven fabric enlarged. It is a schematic cross-sectional view in Y ₁ -Y ₁ cutting line nonwoven layer provided in a pulp-containing nonwoven fabric shown in FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view schematically showing the configuration of the absorbent article 1 according to the first embodiment of the present invention. FIG. 1 is a plan view of the absorbent article 1 as viewed from the side of the top sheet 10. Figure 2 is a schematic cross-sectional view in X ₁ -X ₁ cutting line of the absorbent article 1 shown in FIG. 1 (the width direction of the cross-sectional view of the absorbent article 1). FIG. 3 is a cross-sectional view in the width direction schematically showing the configuration of the absorbent article 2 according to the second embodiment of the present invention. FIG. 4 is a perspective view schematically showing the appearance configuration of the pulp-containing nonwoven fabric 11. FIG. 5 is a schematic plan view showing an enlarged skin side surface 20a of the pulp-containing non-woven fabric 11. Figure 6 is a schematic cross-sectional view in Y ₁ -Y ₁ cutting line nonwoven layer 20 provided in the pulp-containing nonwoven fabric 11 shown in FIG.

It should be noted that each figure does not limit the size relationship of the dimensions of the constituent members such as the top sheet 10, the pulp-containing non-woven fabric 11, the absorber 12, the back sheet 13, the three-dimensional gathers 14, and the transfer sheet 15, and the dimensions of the constituent members are not limited. The dimensions can be appropriately selected from a wide range according to the use of the absorbent articles 1 and 2, the age of the wearer to be used, and the like.

In the present specification, when the absorbent articles 1 and 2 are worn, it means a state in which the absorbent articles 1 and 2 are worn on the body regardless of before, during, and after the absorption of the body fluid. The absorbent articles 1 and 2 are usually worn on the body inside the clothing, but the absorbent articles 1 and 2 may be worn on the body so that at least a part of the absorbent articles 1 and 2 is exposed to the outside. The longitudinal direction of the absorbent articles 1 and 2 and each of the constituent members provided therein is a direction extending to the front and back of the body through the crotch portion of the wearer when the absorbent article 1 is worn on the body. The direction indicated by Y. The width direction of the absorbent articles 1 and 2 and each of the constituent members provided therein is a direction orthogonal to the longitudinal direction, and is a direction indicated by reference numeral X in the drawing. The thickness direction of the absorbent articles 1 and 2 and each of the constituent members provided therein is a direction in which the respective constituent members are laminated, and is a direction indicated by Z in the drawing. Further, the skin side surfaces of the absorbent articles 1 and 2 and the constituent members provided therein are a surface that comes into contact with the wearer's skin and a surface that faces the skin when the absorbent articles 1 and 2 are worn on the body. The non-skin side surface is a surface that comes into contact with the wearer's clothing or a surface that faces the clothing when the absorbent articles 1 and 2 are worn on the body. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Absorbable article>
As shown in FIGS. 1 and 2, the absorbent article 1 of the present embodiment is relatively close to the liquid-permeable top sheet 10 located relatively on the skin side when worn on the body. A pulp-containing non-woven fabric 11, an absorber 12, and a transfer sheet 15 that are located on the non-skin side and are sequentially interposed between the liquid-impermeable back sheet 13 and the top sheet 10 and the back sheet 13 from the skin side. It includes a pair of three-dimensional gathers 14 attached to the top sheet 10 and the back sheet 13.

According to the present embodiment, the absorber 12 has a structure sandwiched between the pulp-containing non-woven fabric 11 as the second sheet and the back sheet 13, and body fluids such as urine pass through the top sheet 10 and the pulp-containing non-woven fabric 11. It is absorbed and retained by the absorber 12. At this time, since the pulp-containing non-woven fabric 11 is composed of two thin layers having good breathability and moldability, that is, a non-woven fabric layer 20 and a wood pulp layer 21 integrated therein, there is little stuffiness and the surface on the skin side thereof. It becomes easy to form the uneven portions 23 and 24 on almost the entire surface. Since the dent in the thickness direction of the pulp-containing non-woven fabric 11 facilitates the diffusion of the body fluid, the absorption rate of the body fluid is improved. In particular, even if the body fluid reaches the pulp-containing nonwoven fabric 11 from a part of the top sheet 10, the body fluid rapidly diffuses to almost the entire pulp-containing nonwoven fabric 11. Further, by having the uneven portions 23 and 24, the surface area of the pulp-containing non-woven fabric 11 is increased, and the permeability of the body fluid to the absorber 12 and the absorption property are improved. Therefore, according to the present embodiment, it is possible to provide the absorbent article 1 in which stuffiness does not easily occur even when worn on the body, the wearing feeling is very good, and the diffusivity, absorbability and absorption rate of the body fluid are remarkably improved. ..

The dimensions of the absorbent article 1 in the longitudinal direction and the width direction are not particularly limited, but are, for example, 100 mm or more and 800 mm or less, and 50 mm or more and 500 mm or less, respectively. By adjusting the dimensions of the absorbent article 1 within the above range, an absorbent article 1 suitable for a light incontinence pad, a urine absorbing pad, a pants-type disposable diaper, a tape-stopping disposable diaper, or the like can be obtained.

The absorbent article 1 of the present embodiment can be used as various absorbent articles regardless of whether it is for babies or adults, and typical examples thereof include a light incontinence pad, a urine absorbing pad, a pants-type disposable diaper, and a tape stopper. Examples include disposable diapers. Further, various paper diapers as an outer and an absorbent article 1 as an inner can be used in combination.

In the present embodiment shown in FIGS. 1 and 2, the entire absorber 12 is covered with the top sheet 10, the pulp-containing non-woven fabric 11, and the transfer sheet 15 and the back sheet 13. The laminated form of each structural member in the absorbent article can be adopted without particular limitation. For example, an embodiment in which the side surface of the absorber 12 is not covered with the top sheet 10 and the pulp-containing non-woven fabric 11 but is covered with the three-dimensional gathers 14 can be mentioned. In this embodiment, it is preferable that the top sheet 10, the pulp-containing non-woven fabric 11, and the absorber 12 have substantially the same overall length (longitudinal length).
Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in detail step by step.

(Top sheet)
The top sheet 10 is a liquid-permeable sheet-like member that allows body fluids to quickly pass toward the absorber 12, and is arranged so as to face the back sheet 13 via the second sheet 11 and the absorber 12. Since the top sheet 10 may come into contact with the wearer's skin, a base material having a soft feel and a property of not irritating the skin is preferable. Examples of the base material include a hydrophilic non-woven fabric, a composite non-woven fabric which is a product of the same or different types of hydrophilic non-woven fabric, an open film such as an open polyethylene film, and a foam film such as urethane foam. The hydrophilic non-woven fabric uses, for example, synthetic fibers made of synthetic resin such as polypropylene or polyethylene, recycled fibers such as rayon, and natural fibers such as cotton, and is subjected to an air-through method, a thermal bond method, a spunlace method, a spunbond method, etc. It is obtained by processing by a known method.

Further, the surface of the top sheet 10 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 10 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, processability and liquid return amount, the basis weight of the top sheet 10 ^{is preferably 15 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 that covers the absorber 12, which is required to guide the body fluid to the absorber 12 so as not to leak.

(Pulp-containing non-woven fabric)
In the absorbent article 1 of the present embodiment, the pulp-containing non-woven fabric 11 shown in FIGS. 2 and 4 is used as the second sheet 11 arranged between the top sheet 10 and the absorber 12 in the thickness direction. The pulp-containing nonwoven fabric 11 includes a spunbonded nonwoven fabric 20 and a wood pulp layer 21 integrated on at least one surface of the spunbonded nonwoven fabric 20. More specifically, in the pulp-containing non-woven fabric 11, in the absorbent article 1, the surface 20a of the spunbonded non-woven fabric 20 (skin side surface as the pulp-containing non-woven fabric 11) faces the non-skin side surface of the top sheet 10 and the wood pulp layer. The surface 21a (non-skin side surface as the pulp-containing non-woven fabric 11) of 21 is arranged so as to face the skin side surface of the absorber 12. The integration of the spunbonded non-woven fabric 20 and the wood pulp layer 21 means that they are firmly fixed to each other and that they do not peel off during the use of the absorbent article 1. However, a very partial peeling or the like on a part of the four peripheral edges of the second sheet 11 does not impair the integration.

Further, the pulp-containing nonwoven fabric 11 has uneven portions 23 and 24 on at least a part of the skin-side surface 20a of the spunbonded nonwoven fabric 20, preferably on the entire surface of the skin-side surface 20a. 4 to 6 schematically show an embodiment of a pulp-containing nonwoven fabric 11 having uneven portions 23 and 24 on the entire surface of the surface 20a.

The uneven portions 23 and 24 shown in FIGS. 4 to 6 have a plurality of rows in which a plurality of convex portions 23 having a substantially regular hexagonal plane shape are arranged substantially linearly in the longitudinal direction at predetermined intervals (concave portions 24). doing. In the width direction, these plurality of rows are arranged substantially parallel to each other in the width direction while maintaining a predetermined phase difference. That is, the uneven portions 23 and 24 of the present embodiment are formed in a pattern in which a plurality of polygons (convex portions 23) are arranged vertically and horizontally at substantially equal intervals (concave portions 24). Here, the planar shape of the convex portion 23 is not limited to a substantially hexagon, and for example, a substantially equilateral triangle, a substantially isosceles triangle, a substantially square, a substantially rectangle, a substantially rhombus, a substantially parallelogram, a substantially pentagon, and a hexagon or more. It may be substantially polygonal, star-shaped, or the like. Further, the arrangement pattern of the uneven portions 23 and 24 may be a grid pattern, a wavy shape, a curved shape, a dot shape, an acorn pattern shape (a continuous shape of acorns), a polka dot pattern, a scale pattern, a checkered pattern, or the like. By adopting these arrangement patterns, the diffusivity of body fluid is improved. For example, even if the body fluid passes through a part of the top sheet 10 and comes into contact with the pulp-containing non-woven fabric 11, the body fluid easily spreads over the entire pulp-containing non-woven fabric 11, so that the absorption rate is further increased.

In the longitudinal direction of the uneven portions 23 and 24, the distance a between the convex portions 23 (here, the shortest distance between the center line of one convex portion 23 and the center line of another convex portion 23 adjacent thereto), the convex portion 23 The diameter (maximum dimension in the longitudinal direction) b, the diameter of the recess 24 (maximum dimension in the longitudinal direction) c, and the maximum depth d of the recess 24 are not particularly limited, and the planar shape of the convex portion 23 and the number of convex portions 23 are not particularly limited. It can be appropriately selected from a wide range according to the use of the absorbent article 1, and for example, the interval a is 0.1 mm or more and 10 mm or less, the diameter b is 0.1 mm or more and 5.0 mm or less, and the maximum depth d is 0. It is preferably 2 mm or more and 3.0 mm or less. Further, the area of the planar shape of the convex portion 23 is not particularly limited, but is preferably ^{1.0 mm 2} or more and 25 mm ^{2 or less.} By setting each of the above dimensions, particularly the maximum depth d of the recess 24, in the above range, the diffusibility of the body fluid into the absorber 12 is remarkably improved.

The dimensions of the uneven portions 23 and 24 were measured using, for example, an analysis application of a one-shot 3D shape measuring machine (trade name: controller VR-3000 Series, manufactured by KEYENCE CORPORATION). The height difference between the convex portion 23 and the concave portion 24 was measured using the analysis application, and calculated as the depth d. The distance a between the convex portions 23 was determined by measuring the distance between the centers of the convex portions 23 using the analysis application. The measurement of each dimension was performed at any 10 places of the uneven portions 23 and 24, and the average value was obtained. The values in the examples are rounded off to the first decimal place.

Here, as the spunbonded non-woven fabric 20, a non-woven fabric produced by a spunbond method, a melt blow method, a flash spinning method, or the like can be used without particular limitation, and examples of the material thereof include nylon (trade name), vinylon, and polyester. , Acrylic resin, polyethylene, polypropylene, polystyrene and other synthetic resins can be preferably used. The spunbonded non-woven fabric may contain a plurality of synthetic resin fibers. Among these, a spunbonded non-woven fabric made of polypropylene is preferable from the viewpoint of strength, softness, absorbency and the like. The basis weight of the spunbonded non-woven fabric 20 is not particularly limited, but is preferably 7 g / m ² or more and 20 g / m ² or less from the viewpoint of tensile strength and softness of touch.

The wood pulp layer 21 is not particularly limited, but for example, a layer made of a non-woven fabric mainly composed of wood pulp fibers (hereinafter, also referred to as “wood pulp non-woven fabric”), a layer in which wood pulp fibers are entangled with each other, and a very small amount of wood pulp fibers. Examples thereof include a layer fixed with an adhesive or a binder. Among these, a layer in which wood pulp fibers are entangled with each other is preferable from the viewpoint of strength, softness, absorbency and the like. The wood pulp fiber used here is not particularly limited, and examples thereof include softwood bleached kraft pulp (hereinafter, also referred to as “NBKP”) such as radiata pine, slash pine, southern pine, lodgepole pine, spruce and Douglas fur. Be done. NBKP can be used alone or in combination of two or more. The basis weight of the wood pulp layer 21 is not particularly limited, but is preferably 30 g / m ² or more and 70 g / m ² or less from the viewpoint of uniformity, tactile sensation, absorbability and the like.

The content of the wood pulp fiber is 65% by mass or more and 90% by mass or less of the total amount of the pulp-containing nonwoven fabric 11, and the balance is preferably spunbonded nonwoven fabric 20, which is 70% by mass or more and 85% by mass or less, and the balance is It is more preferable that the spunbonded non-woven fabric 20 is used. If the content of wood pulp fibers is less than 65% by mass, stable pulp-containing non-woven fabric 11 tends not to be formed in terms of body fluid absorbency, diffusivity, etc., which is not preferable. If it exceeds 90% by mass, the pulp-containing non-woven fabric 11 tends to be formed. Tends to be hard, which is not preferable.

Basis weight of the whole pulp containing nonwoven 11 is preferably 40 g / ^{m 2} or more 80 g / ^{m 2} or less, and more preferably 40 g / ^{m 2} or more 60 g / ^{m 2} or less. If it is less than 40 g / m ² , it tends to be too soft, which is not preferable, and if it ^{exceeds 80 g / m 2} , the pulp-containing non-woven fabric 11 tends to be too hard, which is not preferable.

The thickness of the pulp-containing non-woven fabric 11 is 0.25 mm or more and 0.50 mm or less when measured using a thickness gauge (trade name: dial thickness gauge "PEACOCK (registered trademark)", manufactured by Ozaki Seisakusho Co., Ltd.). It is preferable, and it is more preferable that it is 0.30 mm or more and 0.45 mm or less. If the value is lower than this range, the pulp-containing nonwoven fabric 11 tends to be too soft, and the pulp-containing nonwoven fabric 11 tends to be unable to be stably fixed during the production of the absorbent article 1, which is not preferable. Further, when the value is higher than this range, the pulp-containing nonwoven fabric 11 tends to be hard, which is not preferable.

The integration of the spunbonded non-woven fabric 20 and the wood pulp layer 21 can be carried out by, for example, a thermocompression bonding method, a water flow entanglement method, integration with an adhesive, or the like. Among these methods, the water flow entanglement method is preferable from the viewpoint of achieving both the appearance, softness and strength of the obtained pulp-containing non-woven fabric 11. According to the water flow entanglement method, the wood pulp fibers are entangled in the wood pulp layer 21 by spraying the wood pulp fibers together with the water flow on the non-skin side surface of the spunbonded non-woven fabric 20 without using a binder or an adhesive. The constituent fibers of the spunbonded nonwoven fabric 20 and the wood pulp fibers are entangled to obtain a water flow entangled integrated product in which the spunbonded nonwoven fabric 20 and the wood pulp layer 21 are firmly integrated.

Among such water flow entangled integrated products, at least a part of the wood pulp fibers are entangled with the fibers (synthetic resin fibers) constituting the spunbonded nonwoven fabric 20 and / or other wood pulp fibers, and one of the spunpond nonwoven fabrics 20. An embodiment including a wood pulp layer 21 fixed to a surface and wood pulp fibers exposed to the outside from the other surface (the surface on which the uneven portions 23 and 24 are formed) of the spunbonded non-woven fabric is preferable. According to such an embodiment, the uneven portions 23 and 24, the wood pulp fibers exposed on the surfaces thereof, and the wood pulp layer 21 cooperate to synergistically increase the diffusivity of the body fluid and thus the absorption rate. , Wet back can be improved. The water flow entangled integrated product of the above embodiment can be obtained, for example, by appropriately adjusting the pressure of the water flow sprayed on the spunbonded nonwoven fabric 20. Among the water-flow entangled integrated products of the above embodiment, it is more preferable that the spunbonded non-woven fabric 20 is a spunbonded non-woven fabric made of polypropylene from the viewpoint of strength, softness, and absorbency.

The uneven portions 23 and 24 are formed on the pulp-containing non-woven fabric 11 by, for example, embossing. Examples of the embossing include known methods such as heat embossing, ultrasonic embossing, and high frequency embossing. Pressurization and / or heating and embossing may be performed at the same time. Further, after forming the uneven portions 23 and 24 on the spunbonded nonwoven fabric 20 by embossing or the like, this may be integrated with the wood pulp layer 21.

(Absorber)
The absorbent body 12 is, for example, a sheet-shaped or plate-shaped constituent member having a function of absorbing and holding a body fluid when the absorbent article 1 is attached to the body. In the present embodiment, the pulp-containing non-woven fabric is formed in the thickness direction. It is arranged between 11 and the transfer sheet 15. As the absorber 12, those commonly used in this field can be used without particular limitation. For example, those containing an absorbent fiber as a base material and a highly absorbent polymer (hereinafter, also referred to as “SAP”) are preferable.

The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, disposable diapers and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper and hydrophilic fiber. Examples include rayon. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include those obtained by defibrating wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like into a cotton-like shape.

The SAP is not particularly limited as long as it can absorb body fluid and prevent backflow of body fluid. For example, polyacrylic acid salt, polyaspartate, and (starch / acrylic acid) graft copolymer weight. Examples thereof include polymers containing a carboxyl group-containing monomer such as a coalescence, a (acrylic acid / vinyl alcohol) copolymer, a (isobutylene / maleic anhydride) copolymer and a saponified product thereof. SAP can be used alone or in combination of two or more. Among these SAPs, polyacrylate is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of body fluid absorbed per weight.

The liquid-absorbing sheet containing SAP is not particularly limited, but a liquid-absorbing sheet mixed with SAP particles, a SAP sheet in which SAP particles are fixed between the liquid-absorbing sheets, and the like are preferable. Other than that, there are also liquid-absorbent sheets containing SAP in the form of fibers.

The planar shape of the absorber 12 is an hourglass shape (not shown) in the present embodiment, but is not limited to this, and is not limited to, for example, a substantially rectangular shape (rectangular shape), an I shape, an oval shape, an elliptical shape, and a rectangular shape. It can be shaped like a rounded rectangle with rounded corners. The absorber 12 may be used by stacking two or more layers. The thickness of the absorber 12 is appropriately selected according to the type of body fluid to be absorbed, the form and material of the absorber 12, and the like. Further, from the viewpoints of absorbability and retention of body fluid, shape retention of the absorber 12, prevention of SAP falling off, and the like, the entire absorber 12 may be coated with a hydrophilic film, if necessary.

The absorber 12 of the present embodiment has a substantially linear (not shown) slit 22 extending from the vicinity of one end in the width direction to the vicinity of the other end in the width direction. By arranging the pulp-containing non-woven fabric 11 and providing the slit 22, the diffusivity of the body fluid and the absorbency including the absorption rate are remarkably improved. The slit 22 is not limited to the present embodiment, for example, a slit extending from one end in the width direction to the middle part in the width direction, near one end in the longitudinal direction or around one end, and near the other end or around the other end in the longitudinal direction. It may be a slit extending to, a slit extending from one end in the longitudinal direction to an intermediate portion in the longitudinal direction, a slit extending in the diagonal direction of the absorber 12, or the like. Further, the number of slits 22 in the present embodiment is one, but the number of slits 22 is not limited to one, and a plurality of slits may be used. Further, the slit 22 of the present embodiment is linear, but is not limited to this, and may be, for example, wavy, curved, dotted, or the like.

Here, the width and length of the slit 22 are not particularly limited, but from the viewpoint of achieving a good balance between improving the absorbency including the diffusivity and absorption rate of the body fluid, the strength of the absorber 12, and ensuring the retention of the body fluid. Therefore, for example, the slit width is preferably 10 mm or more and 40 mm or less, and the slit length is preferably 150 mm or more and 300 mm or less. The thickness of the absorber 12 is appropriately selected according to the type of body fluid to be absorbed, the material of the absorber 12, and the like, but the diffusivity, absorbency, absorption rate, retention, wearing feeling, etc. of the body fluid, etc. From the viewpoint of the above, the range is preferably 1 mm or more and 10 mm or less. The length (overall length) of the absorber 12 is preferably 50 mm or more and 750 mm or less (more preferably 300 mm or more and 600 mm or less), and the width direction dimension is preferably 20 mm or more and 470 mm or less.

The absorber 12 of the present embodiment has a slit 22, but the present invention is not limited to this, and an absorber having no slit may be used. FIG. 3 shows an absorbent article 2 with an absorber 16 having no slits. The absorbent article 2 has the same configuration as the absorbent article 1 except that it has an absorber 16 having no slit instead of the absorber 12. Therefore, the absorbent article 2 includes the same modified examples as the absorbent article 1, and can be used for the same various purposes as the absorbent article 1.

(Transfer sheet)
The transfer sheet 15 is arranged between the absorber 12 relatively located on the skin side and the back sheet 13 relatively located on the non-skin side when the absorbent article 1 is attached to the body. The basis weight is 40 g / m ² or more, preferably 40 g / m ² or more and 60 g / m ² or less. By providing such a bulky transfer sheet 15, for example, the absorbability and retention of the body fluid in the vicinity of the central portion in the longitudinal direction and / or the width direction of the absorbent article 1 are enhanced, and the body fluid to the three-dimensional gather 14 described later is enhanced. It has a function of suppressing the migration of.

As the transfer sheet 15, a liquid-permeable base material can be used without particular limitation, and for example, a non-woven fabric such as an air-through non-woven fabric, a thermal bond non-woven fabric, and a spunbond non-woven fabric, and a non-woven fabric of the same type or a different type such as a thermal bond non-woven fabric / spunbond non-woven fabric are laminated. Examples thereof include a foamed film made of a composite non-woven fabric, urethane foam, polyethylene foam and the like, and a composite sheet which is a laminate of two or more of these. Among these, an air-through non-woven fabric is preferable from the viewpoint of preventing the transfer of body fluid to the three-dimensional gather 16. The basis weight of the transfer sheet 15 is not particularly limited, but is, for example, 40 g / m ² or more. The absorbent articles 1 and 2 of the present embodiment include, as another embodiment, an absorbent article having the same configuration as the absorbent articles 1 and 2 except that the transfer sheet 15 is not included.

(Back sheet)
The backsheet 13 is arranged on the most non-skin side of the absorbent article 1, and is, for example, breathable or non-breathable so that the body fluid held by the absorber 12 does not wet clothing or adhere to the skin surface. Consists of a liquid-impermeable substrate. Examples of the liquid-impermeable substrate for the back sheet include a resin film, a composite sheet which is a laminate of a resin film and a non-woven fabric, and the like. Examples of the resin film include a film made of a synthetic resin such as polyester, polyvinyl alcohol, polyethylene and polypropylene, and a composite film of polyethylene and polypropylene. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, for example, spunbonded non-woven fabric, melt-blow non-woven fabric, composite non-woven fabric which is a laminate of spunbond non-woven fabric and melt-blow non-woven fabric, spunbond non-woven fabric, melt-blow non-woven fabric and spunbond non-woven fabric. Examples thereof include a composite non-woven fabric which is a laminated body with.

The basis weight of the back sheet 13 is not particularly limited, but it is preferably ^{15 g / m 2} or more and 40 g / m ^{2 or less from the viewpoint of strength and workability.} Further, in order to prevent stuffiness when worn, it is preferable that the back seat 13 has breathability. The method of imparting breathability to the backsheet 13 is not particularly limited, and a known method can be adopted. For example, a method of making the resin film which is the base material for the backsheet porous, and embossing the base material for the backsheet. There is a method of applying. As an example of the method of making the resin film porous, there is a method of adding a filler to the resin to form a film, and removing the filler from the obtained film. Examples of the filler include inorganic salts such as calcium carbonate.

(Three-dimensional gather)
The three-dimensional gather 14 is provided, for example, to prevent lateral leakage of body fluid excreted by the wearer of the absorbent article 1. In the present embodiment, the three-dimensional gather 14 has one end in the width direction fixed to the skin side surface of the back sheet 13, the middle part in the width direction fixed in the vicinity of both ends in the width direction of the top sheet 10, and the other end in the width direction as a free end. The constituent members are provided so as to cover the periphery of both ends in the width direction of the top sheet 10 and extend in the longitudinal direction of the top sheet 10 so as to be bendable from a fixed intermediate portion in the width direction. By configuring the three-dimensional gather 14 in this way, the standing property is imparted to the vicinity of the free end of the three-dimensional gather 14, and the three-dimensional gather 14 can be deformed according to the wearer's body shape. In the present embodiment, one end of the three-dimensional gather 14 in the width direction is fixed to the skin side surface of the back sheet 13. The present invention is not limited to this, and for example, one end in the width direction may be fixed to the non-skin side surface of the back sheet 13, may be fixed to a bag body composed of the top sheet 10 and the back sheet 13, and further. , May be fixed to the skin side surface of the top sheet 10.

More specifically, the three-dimensional gather 14 is composed of, for example, a three-dimensional gather sheet (not shown) and an elastic member for three-dimensional gather (not shown) fixed to one end in the width direction of the three-dimensional gather sheet. The other end in the width direction of the sheet is fixed to the skin side surface of the back sheet 13, and the end portion in the width direction which is not fixed to the three-dimensional gather sheet of the elastic member for three-dimensional gather becomes a free end. As the three-dimensional gather sheet, a water-repellent or liquid-impermeable non-woven fabric formed of hydrophobic fibers, for example, a spunbond non-woven fabric, a melt-blow non-woven fabric, a composite non-woven fabric in which spunbond / melt-blow / spunbond is laminated, or the like is used. .. As the elastic member for three-dimensional gather, for example, a thread-like, string-like, or band-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used. The absorbent articles 1 and 2 of the present embodiment also include an embodiment that does not include the three-dimensional gather 14.

<Manufacturing method of absorbent goods>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, from the clothing side, the back sheet 13, the transfer sheet 15, the absorber 12, the pulp-containing non-woven fabric 11, and the top The sheets 10 are laminated in this order, and the top sheet 10 and the back sheet 13 are fixed with hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference, and further, the three-dimensional gather 14 is formed. It can be manufactured by attaching it. Then, this may be individually wrapped in a package, and then folded in three in the longitudinal direction.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

(Example 1)
The second sheet having the configuration shown in Table 1 (a water flow entangled integrated product of a polypropylene spunbonded non-woven fabric and a wood pulp fiber layer, and an uneven portion having the dimensions shown in Table 1 is provided on the entire surface on the skin side, and the planar shape of the convex portion is approximately abbreviated. A regular hexagonal wood pulp fiber content of 80% by mass, thickness of 0.5 mm, grain size of 60 g / m ² ), and an absorber (upper layer absorber in Table 1, a layer containing SAP and flap pulp) are used, and A top sheet (air-through non-woven fabric, grain 20 g / m ² ) having the same size as the second sheet and absorber, and a back sheet (polypropylene resin film, grain 20 g / m ² ) having a width dimension of 170 mm and a length dimension of 510 mm were used. The absorbent article of the present invention was produced by laminating in a predetermined order and adhering the predetermined portions.

When the pulp-containing non-woven fabric, which is a water-flow entangled integrated product of the polypropylene spunbonded non-woven fabric and the wood pulp fiber layer, was observed under a microscope, the wood pulp fibers were entangled with each other in the wood pulp layer, and the spunbonded non-woven fabric and the wood pulp layer were also observed. At the interface with, the wood pulp fibers were entangled with the polypropylene fibers constituting the non-woven fabric, and strong adhesion was observed. Further, on the surface on which the unevenness of the pulp-containing nonwoven fabric was formed, the wood pulp fibers penetrated the spunbonded nonwoven fabric in the thickness direction, and a part thereof was exposed.

(Example 2)
The present invention is the same as in Example 1 except that the absorber (upper layer absorber) has the width and length shown in Table 1 and forms a slit extending in the longitudinal direction at the central portion in the width direction of the absorber. The absorbent article of the invention was made.

(Example 3)
The absorber (upper layer absorber) has the width and length shown in Table 1, and a slit extending in the longitudinal direction is formed in the central portion in the width direction of the absorber, and the lower layer thereof has the same structure as the absorber (lower layer). The absorbent article of the present invention was produced in the same manner as in Example 1 except that the absorbent body) was laminated.

(Comparative Example 1)
An absorbent article for comparison was prepared in the same manner as in Example 1 except that the second sheet had no uneven portion on the skin side surface.

(Comparative Example 2)
An absorbent article for comparison was prepared in the same manner as in Example 1 except that a polypropylene air-through non-woven fabric (thickness 0.5 mm, basis weight 20 g / m ^{2) was used as the second sheet instead of the pulp-containing non-woven fabric.}

(Comparative Example 3)
An absorbent article for comparison was prepared in the same manner as in Example 1 except that a tissue (thickness 0.04 mm, basis weight 10 g / m ^{2) was used as the second sheet instead of the pulp-containing non-woven fabric.}
For the absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3 obtained above, the absorption rate was measured and the sensory test (discomfort after absorption, absorbability) was carried out as follows. The results are shown in Table 1.

(Absorption rate)
A measuring jig having an inner diameter of 30 mm and a mass of 2 kg was placed on the center of the top sheet of each of the absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3 and 35 gf / cm ^{2 was placed in the center.} Inject 20 ml of 0.9% saline through the hole at the top under the load of, and start from the point when the saline comes into contact with the absorbent article, and the liquid is completely filled around the center circle of the measuring jig. The time (s) was measured with the time point of being sucked into the body as the end point. This test was performed 3 times. The smaller the value, the better the absorption performance.

(Sensory test)
Using the pads, which are absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3, as inners of disposable diapers, 10 panelists who wear disposable diapers on a daily basis were asked to wear them overnight (10 hours), and after absorption of urine. The discomfort during wearing (“discomfort after absorption” in Table 1) and the quality of absorbability were evaluated according to the following criteria.
◯: “There was almost no discomfort when wearing after absorption” “I was absorbed immediately after urination” was 8 or more and 10 or less △: “There was some discomfort when wearing after absorption” “Urinating After that, "It took some time to absorb" was 5 or more and 7 or less. ×: Is there "I felt uncomfortable when wearing after absorption" or "It took time to absorb after urination" 4 When less than a person

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 above embodiments, and various changes or improvements are made to the above embodiments. It is clear to those skilled in the art that is possible. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

1, 2 Absorbent article 10 Top sheet 11 Pulp-containing non-woven fabric (second sheet)
12, 16 Absorber 13 Backsheet 14 Three-dimensional gather 15 Transfer sheet 20 Spunbonded non-woven fabric 20a Skin side of spunbonded non-woven fabric 21 Wood pulp fiber layer 21a Non-skin side of wood pulp fiber layer 22 Slit 23 Convex part 24 Concave

Claims (12)

A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber arranged between the top sheet and the back sheet, and a second arranged between the top sheet and the absorber. An absorbent article comprising a sheet and
The second sheet includes a spunbonded non-woven fabric and a wood pulp layer integrated with at least one surface of the non-woven fabric, the surface of the spunbonded nonwoven fabric is arranged so as to face the top sheet, and the span. An absorbent article, which is a pulp-containing nonwoven fabric having uneven portions on at least a part of the surface of the bonded nonwoven fabric facing the top sheet. The absorbent article according to claim 1, wherein the pulp-containing nonwoven fabric has the uneven portion on the entire surface of the surface facing the top sheet. The absorbent article according to claim 1 or 2, wherein the absorber has at least one slit extending in the longitudinal direction and / or the width direction thereof. The absorbent article according to claim 3, wherein the width of the slit is 10 mm or more and 40 mm or less, and the length of the slit is 150 mm or more and 300 mm or less. Claimed that the pattern shape of the uneven portion is a pattern in which a grid pattern, a wavy shape, an Aikon pattern shape, a polka dot pattern, a scale pattern, a checkered pattern, or a plurality of polygons are arranged vertically and horizontally at equal intervals from each other. The absorbent article according to any one of 1 to 4. The depth of the concave portion in the uneven portion is 0.2 mm or more and 3.0 mm or less, the area of the concave portion is 1.0 mm ² or more and 25 mm ² or less, and the distance between the concave portions in the uneven portion is 0. The absorbent article according to any one of claims 1 to 5, which is 3 mm or more and 1.0 mm or less. The absorbent article according to any one of claims 1 to 6, wherein the pulp-containing nonwoven fabric is a water-flow entangled integral product of the spunbonded nonwoven fabric and the wood pulp layer. In the water flow entanglement integrated product, at least a part of the wood pulp fibers are entangled with the fibers constituting the spunbonded non-woven fabric and / or other wood pulp fibers, and the wood pulp layer is fixed to one surface of the spunpond non-woven fabric. The absorbent article according to claim 7, comprising the wood pulp fiber exposed to the outside from the other surface of the spunbonded nonwoven fabric. The absorbent article according to any one of claims 1 to 8, wherein the spunbonded non-woven fabric is a spunbonded non-woven fabric made of polypropylene. The absorbent article according to any one of claims 1 to 9, wherein the content of wood pulp in the pulp-containing non-woven fabric is 65% by mass or more and 90% by mass or less. The absorbent article according to any one of claims 1 to 10, wherein the thickness of the pulp-containing nonwoven fabric is 0.25 mm or more and 0.50 mm or less. The absorbent article according to any one of claims 1 to 11, wherein the pulp-containing non-woven fabric has a basis weight of 40 g / m ² or more and 80 g / m ^{2 or less.}

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