JP2021104221A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of absorbing a large amount of body fluid such as urine and loose stool and preventing leakage, particularly lateral leakage. SOLUTION: A liquid-permeable top sheet 10, a liquid-impermeable back sheet 12, an absorber 11 arranged between them, and an absorbent article 1 are provided along the longitudinal direction on both sides in the width direction. The first three-dimensional gathers 13 are provided, and the second three-dimensional gathers 14 provided along the longitudinal direction on the outer side of the width direction of the pair of the first three-dimensional gathers 13 and include the highly absorbent sheet 30 are provided and are high. The absorbent sheet 30 includes a composite nonwoven fabric 15, a highly absorbent polymer 32 supported on the composite nonwoven fabric 15, and an elastic elastic member 31 disposed at one end 14a in the width direction thereof. The composite nonwoven fabric 15 includes a spunbonded nonwoven fabric 20 and a pulp fiber web 21 integrated on at least one surface of the spunbonded nonwoven fabric 20, and the second three-dimensional gather 14 has a folded portion near the free end 14a thereof. An absorbent article 1 having 22. [Selection diagram] Fig. 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 the problem that it is difficult to reliably prevent leakage when a large amount of urine or loose stool is excreted at one time.

An object of the present invention is to provide an absorbent article capable of easily 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 to the outside or inside of the first three-dimensional gather formed along both sides of the absorber in the longitudinal direction, and has a high absorption. A second three-dimensional gather containing a highly absorbent sheet, which is a predetermined composite non-woven fabric carrying a super absorbent polymer (hereinafter, also referred to as “SAP”), is provided, and near the free end of the second three-dimensional gather. It has been found that a desired absorbent article can be obtained by providing a folded portion obtained by folding a superabsorbent sheet, and the present invention has been completed. The present invention provides the following absorbent articles (1) and (2) as preferred embodiments.

(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 pair of first three-dimensional gathers provided along the longitudinal direction on both sides of the article in the width direction and including a water-repellent and / or waterproof sheet, and a pair of first three-dimensional gathers longitudinally outward or inside in the width direction. A pair of second three-dimensional gathers provided along the direction and including a highly absorbent sheet are further provided, wherein the highly absorbent sheet is a composite nonwoven fabric and a highly absorbent polymer supported on the composite nonwoven fabric. And an elastic elastic member disposed at one end in the width direction thereof, the composite nonwoven fabric is a pulp fiber integrated with a spunbonded nonwoven fabric and at least one surface of the spunbonded nonwoven fabric. The second three-dimensional gather, including the web, has a pair of orthostatic free ends extending in the longitudinal direction on the topsheet side surface of the absorbent article, at and near the tip of the orthostatic free end. The absorbent article, wherein the highly absorbent sheet is further provided with a folded-back portion obtained by folding the high-absorbent sheet with the surface of the pulp fiber web inside.
(2) The highly absorbent sheet carries a highly absorbent polymer between the spunbonded nonwoven fabric and the pulp fiber web in the composite nonwoven fabric and / or on the surface of the pulp fiber web. Absorbent article.

According to the present invention, it is possible to provide an absorbent article capable of easily 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 in the folded-back part of the highly absorbent sheet provided in the absorbent article shown in FIG. (A) shows a state before body fluid absorption, and (b) shows a state after body fluid absorption.

Hereinafter, the absorbent article 1 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 section line Osamusei article 1. 3A and 3B are schematic cross-sectional views of the folded-back portion 22 of the highly absorbent sheet 30, where FIG. 3A shows before body fluid absorption and FIG. 3B shows after body fluid absorption. 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. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

Examples of the absorbent article 1 include, but are not limited to, a light incontinence pad, a pants-type disposable diaper, a tape-stopping disposable diaper, and the like, regardless of whether they are for babies or adults, and are other absorbent articles. You may. Further, various paper diapers as an outer and an absorbent article 1 as an inner can be used in combination. The absorbent article 1 of the present embodiment can be particularly suitably used as a disposable disposable diaper or the like. 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 to the above range, it can be used for various purposes.

[Absorbent article]
The absorbent article 1 of the present embodiment shown in FIG. 1 includes a liquid-permeable top sheet 10 located on the skin side when worn, a liquid-impermeable back sheet 12 located on the non-skin side when worn, and a top sheet. An absorber 11 provided between the 10 and the back sheet 12, a first three-dimensional gather 13 and a second three-dimensional gather 14 are provided. Here, as shown in FIG. 3, the second three-dimensional gather 14 extends in the longitudinal direction around the composite nonwoven fabric 15, the highly absorbent polymer 32 supported on the composite nonwoven fabric 15, and the tip portion 14a. The highly absorbent sheet 30 including the elastic elastic member 31 arranged in the above is included. Further, the composite nonwoven fabric 15 includes a spunbonded nonwoven fabric 20 and a pulp fiber web 21 containing pulp fibers integrated on at least one surface of the spunbonded nonwoven fabric 20.

In the present embodiment, the free end 14a of the second three-dimensional gather 14 and its periphery have a folded-back portion 22 folded back toward the rear end side with the surface of the pulp fiber web 21 of the highly absorbent sheet 30 inside. .. In the composite nonwoven fabric 15 in which the pulp fiber web 21 is laminated and integrated on the spunbonded nonwoven fabric 20, relatively minute recesses (not shown) are formed on the surface of the pulp fiber web 21, and the recesses have high absorption. It is easy to support the sex polymer 32. Therefore, the highly absorbent polymer 32 is held inside the folded-back portion 22 without falling off, and the displacement and movement of the highly absorbent polymer 32 are suppressed. Although not shown in FIG. 3 to emphasize the presence of the elastic elastic member 31, the highly absorbent polymer 32 is also supported on the surface of the pulp fiber web 21 around the folded-back portion 22. According to the research of the present inventor, it has been clarified that such a folded-back portion 22 has a particularly high absorption capacity for loose stools and the like. The region fixed to the skin side surface of the second three-dimensional gather 14 has one layer of pulp fiber web 21 supporting the highly absorbent polymer 32, whereas the free end 14a of the second three-dimensional gather 14 and its periphery thereof. In the vicinity of the folded-back portion 22 provided in the above, the pulp fiber web 21 has two layers, and in the most advanced portion, the number of the highly absorbent polymer 32 in the horizontal direction is the largest in the horizontal direction, so that after the body fluid is absorbed. The highly absorbent sheet 30 of No. 30 swells in a substantially T shape in a cross-sectional view, and exhibits a lateral leakage prevention effect. In other words, the second three-dimensional gather 14 after swelling becomes thicker in cross-sectional view and curved inward toward the standing direction (Z direction) from the skin surface side to the self-supporting end 14a. Therefore, the body fluid is pushed back inward in the width direction by the second three-dimensional gather 14. Therefore, by disposing the second three-dimensional gather 14 including the highly absorbent sheet 30 and having the folded-back portion 22 on the outside or the inside in the width direction of the first three-dimensional gather 13, the first three-dimensional gather 13 alone It is possible to reliably prevent leakage (lateral leakage) of body fluids such as urine and loose stools that could not be prevented in the width direction, and it is possible to quickly absorb and retain body fluids from the surface sheet in the thickness direction. Become. As a result, even when a large amount of body fluid such as urine or loose stool is discharged as the absorbent article 1 as a whole, leakage, particularly lateral leakage can be reliably prevented. In addition to that, by configuring so that a space is generated in the folded-back portion 22, the swollen high-absorbent polymer 32 after absorption of the body fluid forms a gel blocking wall in the folded-back portion 22, so that the absorbent article 1 It is possible to more reliably prevent lateral leakage in the width direction.

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 first three-dimensional gather 13, and the second three-dimensional gather 14. 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.

(First three-dimensional gather)
The first three-dimensional gather 13 is provided, for example, to prevent lateral leakage of body fluid excreted by the user of the absorbent article 1. The first three-dimensional gathers 13 of the present embodiment are provided around both ends in the width direction along the longitudinal direction of the absorbent article 1, and one end in the width direction is around both ends in the width direction of the skin side surface of the back sheet 12. The middle portion in the width direction is fixed in the vicinity of both side ends in the width direction of the skin side surface of the top sheet 10, and the other end in the width direction is a bendable free standing end 13a. The fixed position of the first three-dimensional gather 13 is not limited to the present embodiment, for example, along the longitudinal direction of the absorbent article 1, both ends in the width direction of the top sheet 10 and the width direction of the non-skin side surface of the back sheet 12. It may be formed as a pair of bendable members by extending outward from both ends in the width direction of each member.

The first three-dimensional gather 13 includes, for example, a three-dimensional gather sheet (not shown) and an elastic elastic member (not shown) arranged along the longitudinal direction around the widthwise end of the three-dimensional gather sheet. Can be mentioned. By arranging the elastic elastic member as described above, the free end 13a of the first three-dimensional gather 13 can be provided with erectability and can be deformed according to the wearer's body shape. As the three-dimensional gather sheet, a water-repellent and / or waterproof (liquid impermeable) non-woven fabric formed of hydrophobic fibers, for example, a spunbond non-woven fabric, a melt-blow non-woven fabric, a spunbond non-woven fabric / a melt-blow non-woven fabric / a spunbond non-woven fabric, can be used. Examples thereof include laminated composite non-woven fabrics (SMS non-woven fabrics). As the elastic member for three-dimensional gather, for example, a thread-like, string-like, or band-like member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used. The basis weight of the first standing gathers 13 are, for ^{example, 10g / m 2 ~100g / m 2} .

(Second three-dimensional gather)
The second three-dimensional gather 14 includes the highly absorbent sheet 30, is arranged along the longitudinal direction of the absorbent article 1, and one end in the width direction of the back sheet 12 is outside the width direction of the first three-dimensional gather 13. It is fixed to the side surface of the skin, and the other end in the width direction becomes the upright free end 14a, and the free end 14a and its periphery are fixed end side (rear end) with the surface of the pulp fiber web 21 of the high absorption sheet 30 inside. ), It has a folded-back portion 22. In the present embodiment, the folded-back portion 22 has a closed space 40 which is an internal space, but the present invention is not limited to this, and even if the surfaces of the opposing pulp fiber webs 21 are partially or wholly in close contact with each other. good. The fixed position (or mounting position) of the second three-dimensional gather 14 is not limited to this embodiment. For example, the fixed position of one end in the width direction is the non-skin side surface of the back sheet 12, the top sheet 10 and the back sheet. Examples thereof include the periphery of the widthwise end of the bag body with 12 and the widthwise edge of the skin side surface of the top sheet 10. Further, in the present embodiment, the second three-dimensional gather 14 is provided outside the width direction of the first three-dimensional gather 13, but is not limited to this, and is provided inside the first three-dimensional gather 13 in the width direction. It is also possible to obtain the same effect as that of the present embodiment.

As shown in FIG. 3, the highly absorbent sheet 30 includes a composite non-woven fabric 15, an elastic elastic member 31 disposed in the vicinity of the free end 14a, and a height supported on the surface and / or inside of the composite non-woven fabric 15. Includes the absorbent polymer 32. The composite non-woven fabric 15 can quickly absorb body fluids such as urine and loose stool, and the highly absorbent polymer 32 supported on the composite non-woven fabric 15 is adjacent to the hydrophilic pulp fibers in contact with each other and temporarily adheres to the pulp fibers. It has a high body fluid absorption capacity by efficiently absorbing the retained water, and the highly absorbent polymer 32 in contact with the body fluid collected by the composite non-woven fabric 15 efficiently absorbs and retains the body fluid. Further, as shown in FIG. 3B, in the folded-back portion 22, the swollen high-absorbent polymer 32 after the absorption of the body fluid can form a gel blocking wall, so that the second three-dimensional gather is absorbed. Is more leakproof. Further, since the swollen high-absorptive polymer 32 is easily maintained in the concave and convex recesses on the surface of the pulp fiber web 21, the second three-dimensional gather 14 is directed from the upright free end 14a side to the fixed end side even after the body fluid is absorbed. The displacement and movement are reduced, and a stable wall of the highly absorbent polymer 32 can be formed. Therefore, even if the body fluid reaches the vicinity of the second three-dimensional gather 14, the leakage of the body fluid (lateral leakage of the body fluid) to the outside in the width direction of the second three-dimensional gather 14 can be almost certainly prevented. It should be noted that the sheets may be folded back at the folded-back portion and joined to each other by using an adhesive, but the amount is preferably such that the absorbability is not impaired. In addition, the first and second three-dimensional gathers 13 and 14 are joined to each other in a grid pattern extending in the thickness direction or the horizontal direction by existing techniques such as ultrasonic and heat seal, and a joining portion is provided in the grid pattern. There may be no subsections. By doing so, it is possible to hold the highly absorbent polymer that falls from the standing free end 14a side to the fixed end side at that position due to a strong impact when worn.

In the present embodiment, the body fluid leaking laterally from the first three-dimensional gather 13 is absorbed and held by the second three-dimensional gather 14 outside the first three-dimensional gather 13. On the other hand, around the free end 14a of the second three-dimensional gather 14, the return body fluid from the top sheet 10 easily leaks together with the body fluid that has leaked sideways. Return fluid also contributes to lateral leakage. On the other hand, a part of the free end 14a of the second three-dimensional gather 14 has a folded-back portion 22 that is folded back with the surface of the pulp fiber web 21 carrying the highly absorbent polymer 32 inside. Therefore, the amount of the highly absorbent polymer 32 can be set to a large amount while preventing the highly absorbent polymer 32 from moving or shifting before or after the body fluid absorption. As a result, even a body fluid that leaks from the periphery of the free end 13a and is difficult to absorb can be relatively easily absorbed and retained. By providing the double lateral leakage prevention mechanism in this way, lateral leakage can be almost certainly prevented.

The composite non-woven fabric 15 of the present embodiment is an integral product of the spunbonded non-woven fabric 20 and the pulp fiber web 21. Here, the fact that the spunbonded nonwoven fabric 20 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 15. It means that it will not fall out. In particular, when the pulp fibers are water-entangled with the spunbonded nonwoven fabric 20 by a water jet, the pulp fibers are very unlikely to fall off from the composite nonwoven fabric 15. As a preferred embodiment of the integrated product, for example, on one surface of the spunbonded nonwoven fabric 20, a part of the fibers constituting the spunbonded nonwoven fabric 20 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 20 and the pulp fiber web 21 are firmly adhered to each other, and a part of the pulp fibers penetrates the spunbonded nonwoven fabric 20 in the thickness direction and is exposed on the other surface of the spunbonded nonwoven fabric 20. Such an integral body can be obtained, for example, by the water flow confounding method.

As the spunbonded non-woven fabric 20 included in the composite non-woven fabric 15, 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 20 is produced 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 20 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.

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 20 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 20 and the pulp fiber web 21 in the composite nonwoven fabric 15 is, for example, from the viewpoint of absorbability and diffusivity of body fluid, etc. (weight of the spunbonded nonwoven fabric 20 / 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 20 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 15, 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 15 of the present embodiment includes, for example, a step of laminating and integrating the spunbonded nonwoven fabric 20 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 20 and the pulp fiber web 21 may be integrated by using an adhesive or by sewing. The composite nonwoven fabric 15 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 20. The composite nonwoven fabric 15 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 32 supported on the composite non-woven fabric 15, any of the same highly absorbent polymers as used for the absorber 11 can be used. The highly absorbent polymer 32 is used in one or more known methods selected from, for example, between the spunbonded nonwoven fabric 20 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, by supporting the particulate high-absorptive polymer 32 on the surface of the pulp fiber web 21, the deviation from the first three-dimensional gather 13 is reduced, and the first and second body fluids that have leaked laterally are dealt with. The three-dimensional gathers 13 and 14 can work together to deal with the problem, and lateral leakage can be reliably prevented. The shape of the highly absorbent polymer 32 is particulate in the present embodiment, but is not limited to this, and may be fibrous or the like.

The elastic elastic member 31 is arranged along the longitudinal direction around or near the free end 14a. As the elastic elastic member 31, any of those commonly used in this technical field can be used, and for example, a thread-like, string-like, or strip-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used. The arrangement of the elastic elastic member 31 imparts erectability to the free end 14a.

[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. After 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, the first three-dimensional gather 13 is fixed at a predetermined position. Further, by fixing the second three-dimensional gather 14 on the outer side in the width direction and / or the inner side in the width direction, 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.

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 Absorbent article 10 Top tote 11 Absorber 12 Back sheet 13 First three-dimensional gather 13a Free end 14 Second three-dimensional gather 14a Free end 15 Composite non-woven fabric 16 Folded part inner surface 20 Spunbond non-woven fabric 21 Pulp fiber web 22 Folded part 30 Highly absorbent sheet 31 Elastic stretchable member 32 Highly absorbent polymer 40 Internal space of folded part

Claims (2)

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.
A pair of first three-dimensional gathers provided along the longitudinal direction on both sides of the absorbent article in the width direction and comprising a water repellent and / or waterproof sheet.
A pair of second three-dimensional gathers provided along the longitudinal direction on the outside or inside of the pair of first three-dimensional gathers in the width direction and including a highly absorbent sheet are further provided.
The highly absorbent sheet includes a composite nonwoven fabric, a highly absorbent polymer supported on the composite nonwoven fabric, and an elastic elastic member disposed at one end in the width direction thereof.
The composite nonwoven fabric comprises a spunbonded nonwoven fabric and a pulp fiber web integrated on at least one surface of the spunbonded nonwoven fabric, the second three-dimensional gathers being the topsheet side surface of the absorbent article. In the above, a folded portion obtained by folding the highly absorbent sheet with the surface of the pulp fiber web inside is further provided at the tip of the orthostatic free end and in the vicinity thereof, which has a pair of orthostatic free ends extending in the longitudinal direction. An absorbent article, characterized in that it is provided. The absorbency according to claim 1, wherein the highly absorbent sheet carries a highly absorbent polymer between the spunbonded nonwoven fabric and the pulp fiber web in the composite nonwoven fabric and / or on the surface of the pulp fiber web. Goods.

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