JP2021104222A - Absorbent article - Google Patents

Abstract

To provide an absorbent article that can absorb a large amount of body fluid such as urine, and soft feces and prevent leakage, especially, lateral leakage.SOLUTION: An absorbent article 1 includes: a liquid permeable top sheet 10; a liquid impermeable back sheet 12; an absorber 11 disposed between the top sheet 10 and the back sheet 12; and a three-dimensional gather 15 including a three-dimensional gather sheet which is disposed on both sides of the absorbent article 1 in a width direction along a longitudinal direction. The three-dimensional gather sheet includes a high-absorbent sheet 14 including a compound type nonwoven fabric 25 and a high-absorbent polymer 23 carried by the compound type nonwoven fabric 25. The compound type nonwoven fabric 25 includes: a spunbonded nonwoven fabric 22; and a pulp fiber web 21 integrated with at least one of the surfaces of the spunbonded nonwoven fabric 22.SELECTED DRAWING: Figure 2

Description

The present invention relates to absorbent articles.

For conventional absorbent articles, a technique using three-dimensional gathers has been proposed in order to prevent lateral leakage of body fluids such as urine and feces. In particular, the following various techniques are disclosed for preventing leakage to the outside.

In Patent Document 1, in an absorbent article having a waist barrier cuff, the barrier sheets are doubled to form the barrier cuffs, and the vicinity of the distal edge and the vicinity of the proximal edge in the longitudinal direction between the barrier sheets are formed. A structure in which each elastic elastic member is provided is disclosed. It is stated that this structure prevents leakage at the waist even when the auxiliary pad is placed on the skin side of the absorbent article.

Patent Document 2 is surrounded by an absorber, a gather sheet, an impermeable film material, and a surface sheet, and includes a space having a substantially triangular cross-sectional view capable of temporarily storing body fluid such as loose stool, and excreted body fluid. Disclosed is an absorbent article configured to temporarily store the mixture in the space and allow the absorber to absorb the substance. It is stated that this configuration reduces leakage of body fluids, especially loose stools.

In Patent Document 3, in two pairs of absorbent articles, a first three-dimensional gather made of an impermeable sheet and a second three-dimensional gather on the outside thereof are provided along both sides in the longitudinal direction of the absorber. A structure is disclosed in which a space is provided between the standing points in the width direction of the compatible body gather to expose the liquid-permeable surface sheet at the portion between the standing points. With this structure, the body fluid that is blocked by the second three-dimensional gather beyond the inner first three-dimensional gather can be absorbed by the inner absorber from the surface sheet of the exposed part, and leakage is prevented. At the same time, it is described that the collection property to the absorber is improved.

Japanese Unexamined Patent Publication No. 2001-293032 JP-A-2007-143874 Japanese Unexamined Patent Publication No. 2011-206108

However, with conventional absorbent articles, there is still a problem that it is difficult to reliably prevent the leakage of a large amount of urine or loose stool, which is repeatedly excreted in a relatively short time. Further, the absorbable article is required to have a quality that not only absorbs the body fluid without leaking to the outside but also reduces the return of the body fluid to the skin.

An object of the present invention is to provide an absorbent article capable of absorbing a large amount of excreted urine or loose stool and preventing leakage.

As a result of repeated studies to solve the above problems, the present inventor extends in the longitudinal direction inward in the thickness direction of the three-dimensional gathers formed along both longitudinal edges of the absorber, and is a super absorbent polymer (Super Absorbent). We have found that a desired absorbent article can be obtained by disposing a superabsorbent sheet, which is a predetermined composite type non-woven fabric carrying Polymer; hereinafter also referred to as "SAP"), and have completed the present invention. rice field. The present invention provides, as a preferred embodiment, the absorbent articles (1) to (7) below.

(1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet, wherein the absorbent article is provided. A three-dimensional gather including a three-dimensional gather sheet arranged along the longitudinal direction on both sides in the width direction of the article is further provided, and the three-dimensional gather sheet includes a composite non-woven fabric and a highly absorbent polymer supported on the composite non-woven fabric. The composite nonwoven fabric comprises a highly absorbent sheet comprising, and comprises a spunbonded nonwoven fabric and a pulp fiber web integrated on at least one surface of the spunbonded nonwoven fabric. Sex goods.
(2) The highly absorbent sheet is arranged so that the pulp fiber web of the composite non-woven fabric is located inside in the thickness direction of the three-dimensional gather sheet, and the spunbonded non-woven fabric faces the skin side surface of the top sheet. The absorbent article of (1) above.
(3) The three-dimensional gather has a pair of orthostatic free ends extending in the longitudinal direction of the absorbent article at a position facing the skin side surface of the top sheet of the absorbent article, and the tip of the orthostatic free end. The absorbent article according to (1) or (2) above, further comprising a folded portion in which the highly absorbent sheet is folded back with the surface of the pulp fiber web inside.
(4) The absorbent article according to (3) above, wherein the folded-back portion has a closed space inside.
(5) The high-absorbent sheet contains the composite non-woven fabric and the high-absorbent polymer adhesively fixed to the surface of the pulp fiber web of the composite non-woven fabric (1) to (4). Any absorbent article.
(6) The above-mentioned (1) to (5), wherein the highly absorbent sheet further includes an elastic elastic member arranged so as to extend in the longitudinal direction of the absorbent article at one end in the width direction and its periphery. Any absorbent article.
(7) The three-dimensional gather sheet further includes a water-repellent and / or waterproof sheet that is arranged outside the width direction of the highly absorbent sheet and extends along the longitudinal direction of the absorbent article. An absorbent article according to any one of 1) to (6).

According to the present invention, it is possible to provide an absorbent article capable of absorbing a large amount of excreted urine or loose stool and preventing leakage.

It is a top view which shows typically the structure of the absorbent article which concerns on 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 sectional drawing which shows typically the structure of the absorbent article which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the highly absorbent sheet provided in the absorbent article shown in FIG. 1 and FIG. (A) is a perspective view, and (b) is a cross-sectional view in the thickness direction.

Hereinafter, the absorbent articles 1 and 2 of the present embodiment will be described in detail with reference to the drawings. FIG. 1 shows a recoverable article 1 according to the first embodiment as a schematic plan view seen from the top sheet 10 side. Figure 2 is a schematic cross-sectional view according to X ₁ -X ₁ cutting line of the absorbent article 1. FIG. 3 is a schematic cross-sectional view showing the absorbent article 2 according to the second embodiment. 4A and 4B are schematic views of the highly absorbent sheet 14, where FIG. 4A is a perspective view and FIG. 4B is a cross-sectional view in the thickness direction. In each figure, the constituent members are described as being in close contact with each other, but at least one of the constituent members may have one or a plurality of gaps. Further, each figure does not define the magnitude relationship of the dimensions in the longitudinal direction and the width direction of each of the constituent members of the absorbent articles 1 and 2.

In the present specification, the time when the absorbent article 1 is worn means a state in which the absorbent article 1 is worn on the body before and after the absorption of body fluid. The absorbent article 1 is usually worn on the body inside clothing, but may be worn on the body so that at least a part thereof is exposed to the outside. The longitudinal direction of the absorbent article 1 is a direction extending from the front and back of the body through the crotch portion of the wearer when the absorbent article 1 is worn, and is indicated by reference numeral Y in the drawing. The width direction of the absorbent article 1 is a direction (width direction) substantially orthogonal to the longitudinal direction, and is indicated by reference numeral X in the drawing. The thickness direction of the absorbent article 1 is the stacking direction of each component such as the top sheet 10, the absorber 11, and the back sheet 12, and is indicated by reference numeral Z in the drawing. Of the front and back surfaces of the absorbent article 1 and each component, the surface that comes into contact with the wearer's skin when worn or the surface that faces the wearer's skin is the skin side, and the surface that comes into contact with the wearer's clothing or the wearer when worn. The side facing the clothes is the non-skin side. In addition, in all the embodiments, the components having the same or similar functions and / or effects are designated by the same reference numerals, and the description of the first embodiment is incorporated herein by reference. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool. The above is the same for the absorbent article 2.

The absorbent articles 1 and 2 can be used as absorbent articles for various purposes regardless of whether they are for babies or adults, and examples thereof include light incontinence pads, pants-type disposable diapers, tape-stopping disposable diapers, and disposable disposable disposable diapers. Further, various disposable diapers as outerwear and absorbent articles 1 and 2 as innerwear may be combined. The absorbent articles 1 and 2 of the present embodiment can be particularly preferably used as disposable disposable diapers and the like. The dimensions of the absorbent articles 1 and 2 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 articles 1 and 2 to the above range, it can be used for various purposes.

[Absorbent article]
The absorbent article 1 of the present embodiment shown in FIGS. 1 and 2 includes a liquid-permeable top sheet 10 located on the skin side when worn and a liquid-impermeable back sheet 12 located on the non-skin side when worn. The absorber 11 provided between the top sheet 10 and the back sheet 12 and the three-dimensional gathers 15 are provided. Here, the three-dimensional gather 15 is arranged on and around both side ends in the width direction of the absorbent article 1 and includes a three-dimensional gather sheet extending in the longitudinal direction of the absorbent article 1, and the three-dimensional gather sheet is a composite non-woven fabric 25. The composite nonwoven fabric 25 includes the highly absorbent polymer 23 supported on the composite nonwoven fabric 25, and the composite nonwoven fabric 25 is integrated with the spunbonded nonwoven fabric 22 and at least one surface of the spunbonded nonwoven fabric 22. Includes a modified pulp fiber web 21 containing pulp fibers.

A large amount of body fluid such as urine or loose stool that is repeatedly excreted in a short time may not be sufficiently absorbed and retained by the absorber 11 alone. In response to such a problem, in the present embodiment, the highly absorbent sheet 14 is provided on the inner surface of the three-dimensional gather 15 in the thickness direction (the surface of the three-dimensional gather 15 facing the top sheet 10). In the highly absorbent sheet 14, the pulp fiber web 21 is excellent in body fluid absorption. Further, since the surface 21a of the pulp fiber web 21 has a relatively high degree of unevenness, for example, by arranging the highly absorbent polymer 23 on the surface 21a, the highly absorbent polymer 23 can be stably placed in the pocket inside the recess. Can be held in. As a result, the highly absorbent sheet 14 can quickly absorb and retain body fluids such as urine and loose stool. Therefore, the highly absorbent sheet 14 has a high absorption rate of body fluid and a very large absorption capacity. Therefore, by using the absorber 11 and the three-dimensional gather 15 including the highly absorbent sheet 14 in combination, a large amount of body fluid can be easily absorbed and leakage of body fluid (particularly lateral leakage) can be prevented. ..

Further, after the body fluid is absorbed, the highly absorbent polymer 23 of the highly absorbent sheet 14 causes gel blocking, so that a wall of swelling gel (not shown) extending in the longitudinal direction of the absorbent article 1 is formed on the three-dimensional gathers 15. It is formed and can efficiently prevent repeated lateral leakage. Further, the body fluid in contact with the wall of the swollen gel is diffused to the front and rear ends in the longitudinal direction, and the body fluid can be efficiently utilized by efficiently utilizing the entire absorber 11. Further, if a general three-dimensional gather sheet 13b (water-repellent and / or waterproof sheet) is provided on the outer side of the high-absorbency sheet 14 in the width direction, the high-absorption sheet 14 cannot completely absorb the body fluid and the body fluid is high. Even if it penetrates the absorbent sheet 14 and exudes, it is possible to prevent further leakage and the wearer from feeling uncomfortable due to getting wet on the skin.

Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in detail in the order of the top sheet 10, the absorber 11, the back sheet 12, and the three-dimensional gathers 15. In addition, each constituent member may have a three-dimensional shape other than a sheet shape and a plate shape.

(Top sheet)
The top sheet 10 is composed of a base material having liquid permeability such that body fluid permeates the top sheet 10 and moves to the absorber 11. Examples of the liquid-permeable base material for the top sheet include non-woven fabrics such as air-through non-woven fabrics, thermal bond non-woven fabrics, and spunbond non-woven fabrics, composite non-woven fabrics in which the same or different types of non-woven fabrics such as thermal bond / spunbond are laminated, urethane foam, and polyethylene. Examples thereof include a foamed film made of foam and the like, a composite sheet which is a laminate of two or more of these, and the like. Among these, hydrophilic non-woven fabrics such as thermal bond non-woven fabrics, spunbond non-woven fabrics, and thermal bond / spunbond composite non-woven fabrics from the viewpoints of transferability of body fluids to the absorber 11 and diffusivity of body fluids in the absorbent article 1. Is preferable.

The surface of the top sheet 10 may be embossed or perforated, for example, in order to improve liquid permeability. The embossing and drilling can be carried out by a known method 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.

The basis weight of the top sheet 10 of the present embodiment is not particularly limited, but from the viewpoint of strength, workability and liquid return amount, it is preferably 15 g / m ² or more and 200 g / m ² or less, and more preferably 18 g / m ² or more and 40 g. It is less than / m ^2. The shape of the top sheet 10 is not particularly limited, but may be any shape that covers the absorber 11, which is required to guide the body fluid to the absorber 11 so as not to leak.

(Absorber)
The absorber 11 arranged between the top sheet 10 and the back sheet 12 contains an absorbent fiber as a base material and a highly absorbent polymer (SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper and hydrophilic fiber are used. 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 absorbent fiber of the absorber 11 preferably has a basis weight of 50 g / m ² or more and 800 g / m ² or less from the viewpoint of not impairing the absorption performance and the touch.

The highly absorbent polymer (SAP) used for the absorber 11 is not particularly limited as long as it can absorb and retain body fluids and prevent backflow, and is composed of polyacrylic acid salts, polyaspartate salts, etc. Examples thereof include a starch-acrylic acid) graft copolymer, a (acrylic acid-vinyl alcohol) copolymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof. Among these, polyacrylate is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of absorption per weight. The highly absorbent polymer may be used alone or in combination of two or more. ^{The SAP amount of the absorber 11 is preferably 10 g / m 2} or more and 500 g / m ² or less, and the content is 15% by mass or more and 50% by mass or less so as not to impair the absorption performance and the touch. Is preferable.

The form of the absorbent fiber and SAP in the absorber 11 is preferably the form of a laminated mat formed by mixing SAP particles in the absorbent fiber. SAP molded into a fiber form can also be used. Further, for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 11, it is preferable to wrap the absorber 11 in a carrier sheet. The base material of the carrier sheet may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets are provided, the base materials of the carrier sheets may be the same or different.

The absorber 11 may be composed of two or more layers of absorbers, and may be, for example, a laminated body of an upper layer absorber and a lower layer absorber. In this case, the dimensions of the upper layer absorber and the lower layer absorber in the longitudinal direction and the width direction may be larger than the dimensions of the lower layer absorber, and the dimensions of the upper layer absorber are the same as the dimensions of the lower layer absorber. However, the size of the upper layer absorber may be smaller than the size of the lower layer absorber.

(Back sheet)
The backsheet 12 is made of a breathable or non-breathable liquid-impermeable substrate that prevents the body fluid held by the absorber 11 from wetting clothing or adhering to the skin surface. Examples of the base material for the back sheet include a resin film, a composite sheet which is a laminate of the resin film and the 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. Among these, a breathable, non-breathable, impermeable plastic film is preferable from the viewpoint of preventing lateral leakage of body fluid.

The basis weight of the back sheet 12 is not particularly limited, but 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 12 has breathability. The method of imparting breathability to the backsheet 12 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 15 is provided, for example, to prevent lateral leakage of body fluid excreted by the user of the absorbent article 1. In the three-dimensional gather 15 of the present embodiment, one end in the width direction is fixed near both ends in the width direction of the skin side surface of the back sheet 12, and the middle portion in the width direction is fixed near both ends in the width direction of the skin side surface of the top sheet 10. A three-dimensional gather sheet having a free end at the other end in the width direction and an elastic elastic member (not shown) arranged near the other end (free end) in the width direction of the three-dimensional gather sheet and extending in the longitudinal direction are included. By arranging the elastic elastic member, the free end is imparted with erectability, and it can be configured to be deformable according to the body shape of the wearer. In the present embodiment, the elastic elastic member is arranged at the other end in the width direction of the three-dimensional gather sheet, but the present invention is not limited to this, and the elastic elastic member may not be arranged. The fixed position of the three-dimensional gather sheet is not limited to the present embodiment, and includes, for example, the absorbent body 11 along the longitudinal direction of the absorbent article 1 near both ends in the width direction on the skin side surface or the non-skin side surface of the top sheet 10. It may be near both ends in the width direction of the bag body of the top sheet 10 and the back sheet 12, near both ends in the width direction on the skin side surface of the top sheet 10.

The three-dimensional gather 15 of the present embodiment is a three-dimensional gather sheet, which is a water-repellent and / or waterproof sheet (hereinafter, also referred to as “outer sheet”) 13 and a high absorption sheet arranged inside the outer sheet 13 in the width direction. The sex sheet 14 and the like are included. The outer sheet 13 and the highly absorbent sheet 14 may be partially or wholly joined according to a known method. The widthwise ends 13a and 14a of the outer sheet 13 and the highly absorbent sheet 14 are free ends that can stand upright due to the arrangement of the elastic elastic members. Elastic elastic members extending in the longitudinal direction may be arranged at the widthwise ends 13a and 14a of the outer sheet 13 and the highly absorbent sheet 14, and then these ends may be joined.

The outer sheet 13 is not particularly limited as long as it is a water-repellent and / or waterproof sheet, and is, for example, a water-repellent and / or waterproof (liquid impermeable) non-woven fabric formed of hydrophobic fibers. Examples of the non-woven fabric include a spunbonded non-woven fabric, a melt-blown non-woven fabric, and a composite non-woven fabric (SMS non-woven fabric) in which a spunbonded non-woven fabric / melt-blow non-woven fabric / spunbonded non-woven fabric is laminated. The basis weight of the outer sheet 13 is, for ^{example, 10g / m 2 ~100g / m 2} . In the present embodiment, since the outer sheet 13 supports the highly absorbent sheet 14, the body fluid absorption and holding ability of the high absorption sheet 14 is improved, and the body fluid infiltrates the outer surface of the high absorption sheet 14. However, since the outer sheet 13 is present, lateral leakage is prevented.

The highly absorbent sheet 14 will be described later.
Examples of the elastic elastic member include a thread-like, string-like, and band-like member made of natural rubber, synthetic rubber, polyurethane, or the like. In the present embodiment, the outer sheet 13 is arranged on the outside of the highly absorbent sheet 14, but the present invention is not limited to this. The high-absorbency sheet 14 may be provided alone, or a plurality of high-absorbency sheets 14 may be provided.

The highly absorbent sheet 14 includes a composite nonwoven fabric 25 and a highly absorbent polymer 23 supported on the surface and / or inside of the composite nonwoven fabric 25. The composite non-woven fabric 25 can quickly absorb body fluids such as urine and loose stool, and the highly absorbent polymer 23 supported on the composite non-woven fabric 25 has a high body fluid absorption capacity, and is collected by the composite non-woven fabric 25 and highly absorbed. Absorbs and retains body fluids in contact with the sex polymer 23. Therefore, even if the body fluid reaches the periphery of the outer sheet 13, leakage of the body fluid (lateral leakage of the body fluid) to the outside in the width direction of the highly absorbent sheet 14 can be almost certainly prevented.

The composite non-woven fabric 25 of the present embodiment is an integral product of the spunbonded non-woven fabric 22 and the pulp fiber web 21. Here, the fact that the spunbonded nonwoven fabric 22 and the pulp fiber web 21 are integrated means that, specifically, in normal use, the pulp fibers mainly contained in the pulp fiber web 21 are easily separated from the composite nonwoven fabric 25. It means that it will not fall out. In particular, when the pulp fibers are water-entangled with the spunbonded nonwoven fabric 22 by a water jet to form the pulp fiber web 21, the pulp fibers are very unlikely to fall off from the composite nonwoven fabric 25. As a preferred embodiment of the integrated product, for example, on one surface of the spunbonded nonwoven fabric 22, a part of the fibers constituting the spunbonded nonwoven fabric 22 and a part of the pulp fibers constituting the pulp fiber web 21 are entangled with each other. Examples thereof include a form in which the spunbonded nonwoven fabric 22 and the pulp fiber web 21 are firmly adhered to each other, and a part of the pulp fibers penetrates the spunbonded nonwoven fabric 22 in the thickness direction and is exposed on the other surface of the spunbonded nonwoven fabric 22. Such an integral body can be obtained, for example, by the water flow confounding method.

As the spunbonded non-woven fabric 22 included in the composite non-woven fabric 25, 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. , Nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, polystyrene and other synthetic resins can be preferably used. The spunbonded non-woven fabric 22 is manufactured by using synthetic resin fibers made of these materials, and may contain a plurality of synthetic resin fibers. The basis weight of the spunbonded non-woven fabric 22 is not particularly limited, but is 7 g / m ² or more and 20 g / m ² or less from the viewpoint of tensile strength and softness of touch. The spunbonded non-woven fabric 22 is preferably hydrophilically treated with a known hydrophilic agent such as a surfactant. By applying the hydrophilic agent, the body fluid can easily reach the pulp fiber web 21 through the spunbonded non-woven fabric 22.

The pulp fiber web 21 absorbs body fluids quickly, for example. Therefore, among the composite non-woven fabric 25, it is preferable that the pulp fiber web 21 is located inside the three-dimensional gather in the thickness direction and the spunbonded non-woven fabric 22 is arranged so as to face the skin side surface of the top sheet 10. As a result, the body fluid that has reached the vicinity of the three-dimensional gather 15 is quickly absorbed by the pulp fiber web 21, and the absorption is maintained by the highly absorbent polymer 23 supported on the composite non-woven fabric 25. Further, even if an impact force is applied to the composite non-woven fabric 25 due to the movement of the body when worn and the highly absorbent polymer 23 falls off from the pocket in the recess of the pulp fiber web 21, the spunbonded non-woven fabric 22 is not on the surface sheet. Since it falls between the outer sheet 13 and the outer sheet 13, it is possible to suppress the discomfort of the wearer's touch when it falls off.

As the pulp fiber web 21, a non-woven fabric mainly composed of pulp fibers can be used without particular limitation, and further, the pulp fiber web 21 formed by spraying pulp fibers on the surface of the spunbonded non-woven fabric 22 by a water flow entanglement method may be used. The pulp fiber used here is not particularly limited, but is preferably softwood bleached kraft pulp (NBKP) such as radiata pine, slash pine, southern pine, lodge pole pine, spruce and Douglas fur. NBKP can be used alone or in combination of two or more. The basis weight of the pulp fiber web 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 weight composition ratio of the spunbonded nonwoven fabric 22 and the pulp fiber web 21 in the composite nonwoven fabric 25 is, for example, from the viewpoint of absorbability and diffusivity of body fluid, etc. (weight of the spunbonded nonwoven fabric 22 / weight of the pulp fiber web 21). ), Which is 40/60% by weight or more and 10/90% by weight or less. Within this range, the supportability of the pulp fiber web 21 by the spunbonded non-woven fabric 22 and the absorbency of the pulp fiber web 21 are compatible at a high level in a well-balanced manner, which is effective in preventing lateral leakage of body fluids.

Further, with respect to the composite nonwoven fabric 25, the force (tensile strength) required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction in the tensile strength test with Tencilon is not particularly limited, but is preferably 1.5 N /. It is 25 mm or more and 5.0 N / 25 mm or less.

The composite nonwoven fabric 25 of the present embodiment includes, for example, a step of laminating and integrating the spunbonded nonwoven fabric 22 and the pulp fiber web 21, and pressurizing the obtained laminate using a roll or the like as necessary. It can be produced by a production method including a step of heating and / or heating. Further, the spunbonded nonwoven fabric 22 and the pulp fiber web 21 may be integrated by using an adhesive or by sewing. The composite nonwoven fabric 25 can also be obtained by a manufacturing method including a water flow entanglement step of injecting pulp fibers constituting a pulp fiber web together with a water jet (water stream) onto the spunbonded nonwoven fabric 22. The composite nonwoven fabric 25 may be embossed.

Among the above-mentioned manufacturing methods, a method using a water flow confounding method is preferable from the viewpoint of achieving both softness and strength in appearance and touch. In the water flow entanglement step, the hole diameter Φ of the water jet nozzle for injecting the water jet is preferably 0.06 mm or more and 0.15 mm or less, and the water jet nozzle has a hole diameter of 0.06 mm or more and 0.15 mm or less from the viewpoint of the balance between the softness of appearance and touch and the efficiency. The interval is preferably 0.4 mm or more and 1.0 mm or less.

As the highly absorbent polymer 23 supported on the composite nonwoven fabric 25, any of the same highly absorbent polymers as used for the absorber 11 can be used. Here, the highly absorbent polymer 23 is preferably used in the form of particles. The particle size is not particularly limited, and the absorbent article 1 may be appropriately selected as long as it does not give a rough feel due to the particles when worn on the body. The highly absorbent polymer 23 is used in one or more known methods selected from, for example, between the spunbonded non-woven fabric 22 and the pulp fiber web 21, the layer of the pulp fiber web 21, the surface of the pulp fiber web 21, and the like. It is carried according to. Above all, a form in which the highly absorbent polymer 23 in the form of particles is supported on the surface of the pulp fiber web 21 by, for example, a hot melt adhesive or thermocompression bonding is preferable. By arranging the high-absorbent polymer 23 in a fixed manner, the displacement and movement of the high-absorbent polymer 23 are further suppressed, the function of the high-absorbent sheet 14 as an absorber is made uniform throughout, and regardless of the leakage position of the body fluid. , Can absorb body fluids. The basis weight of the highly absorbent polymer 23 is not particularly limited, but is preferably 30 g / m ² or more and 300 g / m ² or less.

[Manufacturing method of absorbent articles]
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, the back sheet 12, the absorber 11, and the top sheet 10 are laminated in this order from the clothing side, and the top sheet is used. By fixing the 10 and the back sheet 12 with hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference, and then fixing the three-dimensional gather 15 at a predetermined position. , The absorbent article 1 can be manufactured. Then, this may be individually wrapped in a package, and then folded in three in the longitudinal direction.

<Absorbent article according to the second embodiment>
In the absorbent article 2 shown in FIG. 3, the surface 21a of the pulp fiber web 21 is located inside the three-dimensional gather sheet in the thickness direction inside the outer sheet 13 in the width direction, and the spunbonded non-woven fabric 22 covers the skin side surface of the top sheet 10. The high-absorbency sheet 14 is arranged so as to face the surface, and the end portion (free end or standing free end) 14a of the high-absorbency sheet 14 and its periphery have a folded-back portion 20 folded back with the surface 21a inside. Except for the above, it has the same configuration and modification as the absorbent article 1. The folded-back portion 20 contains a high-absorbent polymer 23 that is more than twice as much as the non-folded portion of the high-absorbency sheet 14, and the layer thickness is also large. Therefore, the absorption rate of body fluid and the absorption of body fluid are increased. Absorption performance such as amount and holding amount is remarkably improved. In the folded portion 20, for joining the end portion 14a and the surface 21a, for example, a method such as adhesion with a hot melt adhesive, heat sealing, or thermocompression bonding can be used. Further, the end portion 14a may be simply folded back.

The vicinity of the free end 14a of the highly absorbent sheet 14 is usually in an open state without blocking body fluids. Therefore, if a relatively large amount of body fluid invades this portion, leakage is likely to occur. To solve such a problem, by providing the folded-back portion 20 having the above-mentioned function, the body fluid leaked around the free end 14a can be instantly absorbed and held without leaking to the outside. If the body fluid leaks from the vicinity of the free end 14a, the wearer's skin is likely to return to the skin. Therefore, preventing the leakage here can improve the quality of the absorbent article 2.

Further, the folded-back portion 20 has a closed space 30 inside thereof. Such a closed space 30 is formed so that the pulp fiber web 21 at the end 14a is folded inward and the surface of the spunbonded non-woven fabric 22 facing the skin side surface of the top sheet 10 is in contact with the outer sheet 13. There is. By providing the closed space 30, the highly absorbent polymer 23 that falls off from the highly absorbent sheet 14 during wearing can be held in the closed space 30 and the body fluid absorption performance can be maintained at a high level. Further, since the closed space 30 becomes a space in which the highly absorbent polymer 23 absorbs the body fluid and expands, the high absorbing polymer 23 maximizes the holding ability of the body fluid and is also a highly absorbent polymer. 23 can form gel blocking to prevent further lateral leakage. With the above configuration, it is possible to prevent lateral leakage of temporarily large amounts of excreted urine and loose stool from the left and right, which could not be prevented by the conventional general three-dimensional gather (outer sheet 13) alone. The closed space 30 includes not only a space mainly surrounded by the surface 21a of the pulp fiber web 21, but also a space that communicates with the space and is mainly surrounded by the outer sheet 13 and the highly absorbent sheet 14. Includes.

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 tote 11 Absorber 12 Back sheet 13 Water-repellent and / or waterproof sheet 13a Free end 13b Water-repellent and / or waterproof sheet sheet part 14 Highly absorbent sheet 14a Free end 20 Folded part 21 Pulp fiber web 22 Spunbonded non-woven fabric 23 Highly absorbent polymer 25 Composite non-woven fabric 30 Closed space

Claims (7)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet.
Further provided with three-dimensional gathers including three-dimensional gather sheets arranged along the longitudinal direction on both sides of the absorbent article in the width direction.
The three-dimensional gather sheet comprises a highly absorbent sheet containing a composite nonwoven fabric and a highly absorbent polymer supported on the composite nonwoven fabric.
The composite nonwoven fabric is an absorbent article comprising a spunbonded nonwoven fabric and a pulp fiber web integrated on at least one surface of the spunbonded nonwoven fabric. In the highly absorbent sheet, the pulp fiber web of the composite non-woven fabric is located inside in the thickness direction of the three-dimensional gather sheet, and the spunbonded non-woven fabric is arranged so as to face the skin side surface of the top sheet. , The absorbent article according to claim 1. The three-dimensional gather has a pair of orthostatic free ends extending in the longitudinal direction of the absorbent article at a position facing the skin side surface of the top sheet of the absorbent article, and the tip of the orthostatic free end and its vicinity thereof. The absorbent article according to claim 1 or 2, further comprising a folded portion obtained by folding the highly absorbent sheet with the surface of the pulp fiber web inside. The absorbent article according to claim 3, wherein the folded portion has a closed space inside. The high-absorbency sheet according to any one of claims 1 to 4, wherein the high-absorbency sheet includes the composite non-woven fabric and the high-absorbent polymer adhesively fixed to the surface of the pulp fiber web of the composite non-woven fabric. The absorbent article described. The high-absorptive sheet according to any one of claims 1 to 5, further comprising an elastic elastic member arranged so as to extend in the longitudinal direction of the absorbent article at one end in the width direction and its periphery. Absorbent article. Claims 1 to 6 further include a water-repellent and / or waterproof sheet that is disposed outside the width direction of the highly absorbent sheet and extends along the longitudinal direction of the absorbent article. The absorbent article according to any one of the above.

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