JP2021122323A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which is excellent in body liquid diffusibility and liquid permeability, and has improved liquid return preventiveness.SOLUTION: An absorbent article 1 includes a liquid permeable top sheet 10, a liquid impermeable back sheet 11, and an absorber 12. The absorber 12 has an absorber body 20 which includes an absorption component and has a slit extending in a longitudinal direction and an opening 23 which is a laminate with a compound type nonwoven fabric 21 arranged so as to contact the surface on the back sheet 11 side of the absorber body 20 and is formed by the slit and the compound type nonwoven fabric 21. The compound type nonwoven fabric 21 includes a spunbonded nonwoven fabric and a pulp fiber web integrated with the same and is further provided between the top sheet 10 and the absorber 12 with an open hole film 13 that is arranged so as to cover a both end parts periphery in a width direction on the surface on the top sheet 10 side of the absorber 12, a side surface part, and the back sheet 11 side of the composite type nonwoven fabric 21. The open hole film 13 has an open hole whose open hole diameter on one surface is relatively larger than an open hole diameter on the other surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to absorbent articles.

In general, absorbent articles such as light incontinence pads, pants-type disposable diapers, and tape-stopping disposable diapers include a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber placed between the two sheets. It is composed of ,. As a result, body fluids such as urine are absorbed by the absorber through the top sheet and are prevented from leaking to the outside by the back sheet. Various proposals have been made for such absorbent articles in order to improve the absorbability of body fluids, improve the wearing feeling of the wearer, prevent leakage, and the like.

For example, in the prior art, it is known that the absorption performance such as wet back and absorption rate is improved by providing the perforated film at a predetermined position of the absorbent article. Further, the perforation film constitutes a perforation in which the perforation area on one surface is relatively large and the perforation area on the other surface is relatively small, and the larger perforation area is on the skin side. It is also known that by arranging the smaller opening area on the non-skin side, wet back and improvement in absorption rate can be obtained. As the prior art using the perforated film, for example, there are the following Patent Documents 1 and 2.

Patent Document 1 includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber between them, and the top sheet is a laminated integrated product of a skin side layer and a non-skin side layer. Disclosed is an absorbent article in which the skin side layer is an open-hole film made of a thermoplastic resin and the non-skin side layer contains bulky cellulose fibers.

Patent Document 2 includes an absorber and an absorber coating layer arranged in contact with the absorber, and the absorber contains a highly absorbent polymer and / or fluff pulp as a body fluid absorbing component, and coats the absorber. As the layer, an absorbent article made of a synthetic resin perforated film having excellent water resistance and air permeability and having a funnel-shaped protruding perforated structure is disclosed. The perforated film is arranged so that the crown of the perforated structure protruding like a funnel is in contact with the absorber, and the effects thereof are prevention of detachment of the absorbing component from the absorber and the form of the absorber. Stabilization etc. are described.

Further, as a conventional technique other than the perforated film, Patent Document 3 includes an absorber provided in a front-rear direction range including a crotch portion and a top sheet covering the front side of the absorber, and the absorber has a surface. A recessed groove having a predetermined width or a slit having a predetermined width extending in the front-rear direction is provided on the back side of the top sheet, and the top sheet has a recessed groove or a recessed portion in the slit of the absorber. Disclosed are absorbent articles that have a ridge.

Japanese Unexamined Patent Publication No. 8-66425 Japanese Unexamined Patent Publication No. 2002-355271 JP-A-2017-60633

However, although Patent Document 1 is effective in preventing liquid return such as wet back and improving the absorption rate, it cannot be said that it is sufficiently effective in improving the diffusivity of body fluid in the absorber. The absorption performance of the absorber has not been fully exhibited. Further, Patent Document 2 uses an opening film having a smaller opening area on the skin side surface than on the non-skin side surface, and is configured such that the surface having the smaller opening area is in contact with the absorber. However, Patent Document 2 does not aim to improve the diffusivity of body fluid in the absorber, and does not improve the diffusibility of body fluid. Further, Patent Document 3 provides a slit instead of an opening, but does not consider comfort when worn.

An object of the present invention is to provide an absorbent article having excellent body fluid diffusivity and liquid permeability and improved liquid return prevention property.

As a result of intensive research to solve the above problems, the present inventor uses an absorber provided with an opening extending in the longitudinal direction, covers the surface of the absorber on the top sheet side with a perforated film, and absorbs the absorber. It has been found that a desired absorbent article can be obtained by using a predetermined composite type non-woven fabric so as to be in contact with the backsheet side surface of the body, and the present invention has been completed. The present invention provides, as a preferred embodiment, the absorbent articles (1) to (8) 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 body is provided. Is a laminate of an absorbing body containing an absorbing component and having a slit extending in the longitudinal direction, and a composite non-woven fabric arranged so as to be in contact with the backsheet side surface of the absorbing body, and the slit and the said. It has a longitudinally extending opening formed of a composite nonwoven fabric, the composite nonwoven fabric comprising a spunbonded nonwoven fabric and a pulp fiber web integrated on at least one surface of the spunbonded nonwoven fabric. , An opening arranged between the top sheet and the absorber so as to cover the top sheet side surface and side surface portion of the absorber, and the widthwise both ends of the back sheet side surface of the composite nonwoven fabric. An absorbent article further comprising a pore film, wherein the pore film has a pore diameter on one surface that is relatively larger than a pore diameter on the other surface.
(2) The perforated film further covers the absorber along the top sheet side surface of the composite nonwoven fabric exposed on the inner wall surface of the opening and the bottom surface of the opening. 1) Absorbent article.
(3) The absorbent article according to (1) or (2) above, wherein the perforated film is arranged so that one surface of the perforated film having a relatively large perforated diameter faces the absorber.
(4) The absorbent article according to any one of (1) to (3) above, further comprising a second sheet arranged between the top sheet and the perforated film.
(5) The absorbent article of (4) above, wherein the top sheet and the second sheet are both air-through non-woven fabrics.
(6) The ratio of the basis weight of the top sheet to the basis weight of the second sheet (the basis weight of the top sheet / the basis weight of the second sheet) is 50% or more and 130% or less. 5) Absorbent article.
(7) In the perforated film, the ratio of the total perforated area to the total area of the surface is 25% or more and 50% or less on the one surface having a relatively large perforated diameter. 6) Any of the absorbent articles.
(8) In the above-mentioned (1) to (7), the difference between the relatively large opening diameter and the relatively small opening diameter is 0.03 mm or more and 0.15 mm or less in the opening film. Any absorbent article.

According to the present invention, there is provided an absorbent article having excellent body fluid diffusivity and liquid permeability and improved liquid return prevention property.

It is a top view which shows typically the structure of the absorbent article which concerns on 1st Embodiment of this invention. It is a schematic cross-sectional view in the width direction by the X ₁ -X ₁ cutting line shown in FIG. It is sectional drawing which shows one Embodiment of the perforated film schematically. It is sectional drawing which shows the other embodiment of the perforated film schematically.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings, but these are listed for exemplification purposes and do not limit the present invention. No. The same elements are designated by the same reference numerals throughout the description of the embodiments.

In the present specification, it is defined as follows. The time when the absorbent article 1 is worn means a state in which the wearer wears the absorbent article 1 on the body of the body fluid regardless of before, during or after the absorption of the body fluid. The longitudinal direction, width direction, and thickness direction of the absorbent article 1 are the direction extending back and forth through the crotch portion of the wearer when the absorbent article 1 is worn, the direction orthogonal to the longitudinal direction, and the direction orthogonal to the longitudinal direction, respectively. It is a direction substantially perpendicular to the plane including the longitudinal direction and the width direction. The skin side surface is the surface of the absorbent article 1 and the front and back surfaces of each component that comes into contact with or faces the wearer's skin when worn, and the non-skin side surface refers to the wearer's clothing when worn. The surface that comes into contact with or faces the garment. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Absorbable article>
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 examples thereof include a light incontinence pad, a pants-type disposable diaper, and a tape-stopping disposable diaper. The absorbent article 1 may be used as an inner, and various disposable diapers may be used as an outer. The lengthwise dimension of the absorbent article 1 is preferably 100 mm or more and 800 mm or less, and the widthwise dimension is preferably 50 mm or more and 500 mm or less. By adjusting the dimensions of the absorbent article 1 within the above range, absorbent articles of various sizes can be easily produced.

FIG. 1 is a schematic plan view of the absorbent article 1 according to the present embodiment as viewed from the top sheet 10 side. Figure 2 is a schematic cross-sectional view in the width direction of the absorbent article 1 according to X ₁ -X ₁ cutting line shown in FIG. 1 and 2 do not specify the size and size of each component of the absorbent article 1. Further, in FIG. 2, there is a portion in which the layers of the constituent members are described so as to be in close contact with each other, but at least one gap may be formed between the layers.

The absorbent article 1 of the present embodiment includes a liquid-permeable top sheet 10 arranged on the skin side, a liquid-impermeable back sheet 11 arranged on the non-skin side facing the top sheet 10, and a top. An absorber 12 arranged between the sheet 10 and the back sheet 11, and a perforated film 13 arranged between the top sheet 10 and the absorber 12 and covering the surface of the absorber 12 on the top sheet 10 side and the like. It includes a pair of three-dimensional gathers 14.

In the absorbent article 1, the absorbent body 12 includes an absorbent main body 20 containing an absorbent component and having a slit extending in the longitudinal direction, and a composite non-woven fabric 21 arranged so as to be in contact with the back sheet 11 side surface of the absorbent main body 20. The absorbent body 12 has an opening 23 formed by the slit of the absorbent main body 20 and the composite non-woven fabric 21 and extending in the longitudinal direction. The composite nonwoven fabric 21 includes a spunbonded nonwoven fabric and a pulp fiber web integrated on at least one surface of the spunbonded nonwoven fabric. Further, the perforated film 13 covers the absorber 12 along the surface of the absorber 12, and more specifically, the surface of the absorber 12 on the top sheet 10 side, and the inner wall surface of the opening 23 provided on the surface. And its bottom surface, the side surface of the absorber 12, and both ends in the width direction of the back sheet 11 side surface of the absorber 12 and the peripheral region thereof are continuously covered.

According to such a configuration, when the absorbent article 1 receives a body fluid such as urine, the lower layer (composite type non-woven fabric 21) in the absorber 12 quickly wets and spreads, so that the body fluid is diffusible and permeates. As a result, the liquid return prevention property is improved, and lateral leakage is further prevented. That is, by simply wrapping the absorber 12 having the opening 23 extending in the longitudinal direction (the absorbing body 20 having the slit extending in the longitudinal direction) with the perforated film 13 effective for improving the wetback property, the wetback is simply performed. It has been clarified by the research of the present inventor that not only the improvement of sex is obtained but also the absorption rate of body fluid is remarkably improved. Further, by wrapping the absorber 12 with the perforated film 13 as described above, the liquid flow in the absorber 12 can be smoothed, and further, on the inner wall surface and the bottom surface of the slit of the absorber body 20. It was found that the diffusivity of the body fluid in the absorbing body 20 was improved by adding the perforated film 13 and bringing it into contact with the absorbing component.
Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in more detail. Each component may have a three-dimensional shape other than a sheet shape or a plate shape.

<Top sheet>
The top sheet 10 may be formed of a base material having liquid permeability such that body fluid moves to the absorber 12. For example, a non-woven fabric such as an air-through non-woven fabric, a thermal bond non-woven fabric, or a spunbond non-woven fabric, or a thermal bond non-woven fabric. / Composite non-woven fabric which is a laminated body of spunbonded non-woven fabric, foamed film such as urethane foam, and composite sheet which is a laminated body of two or more kinds thereof can be mentioned. 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, workability and liquid return amount, the basis weight of the top sheet 10 ^{is preferably 18 g / m 2} or more and 40 g / m ² or less. The shape of the top sheet 10 is not particularly limited, but may be any shape that covers the absorber 12, which is required to guide the body fluid to the absorber 12 so as not to leak.

<Back sheet>
The back sheet 11 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 12 does not wet the clothes, and is a resin film or a composite in which the resin film and the non-woven fabric are laminated. It is formed from a material such as a sheet. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, and for example, various non-woven fabrics such as air-through non-woven fabric, spunbond non-woven fabric, melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric and the like. Examples thereof include a composite non-woven fabric which is a laminated body of the above and a composite material thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet 11 ^{is preferably 15 g / m 2} or more and 60 g / m ² or less. Further, in order to prevent stuffiness during wearing, it is preferable that the back seat 11 is provided with breathability. In order to add air permeability to the back sheet 11, for example, a filler may be blended in the resin film of the base material, or the back sheet 11 may be embossed. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Opening film>
The perforated film 13 covers the absorber 12 along the surface of the absorber 12, and more specifically, the surface of the absorber 12 on the top sheet 10 side, the inner wall surface of the opening 23 provided on the surface, and the inner wall surface thereof. The top sheet 10 side surface of the composite non-woven fabric 21 exposed on the bottom surface, the side surfaces (both end faces in the width direction) of the absorber 12 (absorbent body 20 and the composite non-woven fabric 21), and the back of the absorber 12 (or the composite non-woven fabric 21). Both ends in the width direction and the peripheral area extending in the longitudinal direction of the surface on the sheet 11 side are continuously covered. The perforated film 13 covers the absorber 12 in a so-called C shape, and is arranged along the inner wall surface and the bottom surface of the opening 23.

In the present specification, as shown in FIGS. 1 and 2, what is bent along the surface of the absorber 12 is referred to as a perforated film 13, which is the same as the perforated film 13, but is flat without being bent. As shown in FIG. 3, the sheet-like form is used as the perforated film 25. The perforated film 25 preferably has liquid permeability and liquid diffusivity such that body fluid moves to the absorber 12. As the opening film 25, a film having an opening diameter L2 on one surface that is relatively larger than the opening diameter L1 on the other surface and that can be bent can be used without particular limitation.

The basis weight of the perforated film 25 is not particularly limited, but from the viewpoint of strength, workability, etc., ^{it is preferably 20 g / m 2} or more and 60 g / m ² or less, and 23 g / m ² or more and 30 g / m ² or less. More preferably. Further, from the viewpoint of liquid permeability, the number of openings 25a ^{is preferably 50 / cm 2} or more. Further, from the viewpoint of liquid diffusivity, the opening diameter L1 is preferably 0.45 mm or more and 0.65 mm or less. The opening diameter L2 is preferably 0.60 mm or more and 0.75 mm or less. By setting the number of holes 25a, the diameter of the holes, and the basis weight of the perforated film 25 within the above ranges, the perforated film 25 having excellent strength and workability and excellent liquid permeability and liquid diffusivity can be obtained. Be done. The material of the perforated film 25 is not particularly limited as long as it is a synthetic resin that can be formed into a film, but a polyolefin resin is preferable, polyethylene and polypropylene are more preferable, and polyethylene is further preferable.

Further, as shown in FIG. 3, the opening film 25 is provided with holes such that the opening diameter L1 on one surface is relatively small and the opening diameter L2 on the other surface is relatively large in the thickness direction. There is. From the viewpoint of liquid diffusivity, the difference between the opening diameter L2 on one surface having a large opening diameter and the opening diameter L1 on the other surface having a small opening diameter is preferably 0.03 mm or more and 0.15 mm or less.

It is preferable that the opening film 13 is arranged so that the opening 25a on the side having the larger opening diameter faces the absorber 12. As a result, the body fluid is prevented from returning from the absorber 12 and the body fluid discharged from the composite non-woven fabric 21 provided in the lowermost layer of the absorber 12 through the opening 23 provided in the absorber 12 is discharged. By diffusing the body fluid over the entire body, the body fluid can be widely absorbed by the entire absorber 12, and as a result, the liquid return prevention property can be further improved.

The perforated film 25A shown in FIG. 4 has a plurality of ribs (or convex portions) protruding outward on one surface, and has a plurality of perforations having a perforation diameter of L1 near the top of the ribs. On the surface opposite to the surface on which the ribs are provided, there is an opening that communicates with the opening having an opening diameter of L1 and has an opening diameter of L2. Therefore, the opening having the opening diameter L1 and the opening having the opening diameter L2 are connected by a funnel-shaped internal space. Even with such a perforated film 25A, the same effect as that of the perforated film 25 can be obtained.

<Absorbent>
The absorber 12 of the present embodiment preferably has a longest width dimension in the longitudinal direction of 100 mm or more and 800 mm or less, and more preferably 150 mm or more and 500 mm or less. The maximum width of the absorber 12 in the width direction is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less. Further, the absorption body 20 of the absorber 12 of the present embodiment may be two layers of an upper layer absorber located on the side surface of the skin and a lower layer absorber located on the side surface of the non-skin, and is one layer. May be good.

The absorber 12 of the present embodiment is a laminate of an absorbing main body 20 containing an absorbing component and having a slit extending in the longitudinal direction, and a composite non-woven fabric 21 arranged so as to be in contact with the back sheet 11 side surface of the absorbing main body 20. It has a body, and has an opening 23 formed of a slit of the absorbing body 20 and a composite non-woven fabric.

(Absorption body)
The absorption body 20 has a slit that penetrates in the thickness direction and extends in the longitudinal direction. However, as the absorbent body 12 as a whole, the composite non-woven fabric 21 covers the surface of the absorbent body 20 on the back sheet 11 side, so that the absorbent body 12 becomes an opening 23. As described above, the opening 23 cooperates with the opening film 13 and the composite non-woven fabric 21 to improve the body fluid absorption rate, body fluid diffusibility, body fluid absorption amount, and the like of the absorbent article 1. The number of openings 23, the longitudinal dimension, and the width dimension are not particularly limited, but the number is 1 or more and 10 or less, the longitudinal dimension is 20 mm or more and 750 mm or less, and the width direction dimension is 5 mm or more and 50 mm or less, respectively. It is preferable to have.

The absorption body 20 contains, as an absorption component, a support responsible for initial absorption, a highly absorbent polymer having liquid retention, and the like. Examples of the support include fluff pulp and cellulose acetate tow. The highly absorbent polymer is not particularly limited as long as it can absorb body fluids and prevent backflow, and is composed of polyacrylic acid salt, polyaspartate, (starch / acrylic acid) graft copolymer, and (acrylic acid). Examples thereof include an 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.

When a fluff pulp or a spread fiber of cellulose acetate tow is used as a support, the basis weight of the highly absorbent polymer to be supported ^{is preferably 100 g / m 2} or more and 600 g / m ² or less, preferably 245 g / m. m and more preferably ² or more 445 g / ^{m 2} or less. By setting the value within the above numerical range, gel blocking in the absorber 12 can be prevented, and a large amount of body fluid can be absorbed by the absorber 12.

Preferably cellulose acetate tow is opened, the basis weight of opened cellulose acetate tow, is preferably 20 g / ^{m 2} or more 120 g / ^{m 2} or less, 45 g / ^{m 2} or more 85 g / ^{m 2} It is more preferable that it is as follows. Within the above numerical range, there is no problem in the formation of the absorber, and there is no problem in the body fluid retention performance of the highly absorbent polymer.

(Composite non-woven fabric)
The composite nonwoven fabric 21 of the present embodiment is preferably arranged so that the pulp fiber web is in contact with the backsheet 11 side surface of the absorbing body 20. Since the pulp fiber web has excellent liquid absorption and rectifying action of body fluid, it improves the liquid diffusivity in the absorption body 20, efficiently uses the absorption component in the absorption body 20, and increases the amount of body fluid absorbed. be able to.

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

As the spunbonded non-woven fabric contained in the composite non-woven fabric 21, 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 of the fibers constituting the non-woven fabric include, for example. Synthetic resins such as nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene can be preferably used. The spunbonded non-woven fabric 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 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 spunbonded non-woven fabric 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 through the spunbonded non-woven fabric.

Since the pulp fiber web has good body fluid absorption, for example, the body fluid locally passed through the spunbonded non-woven fabric is quickly diffused, and the body fluid is easily diffused over the entire region of the absorber 12. Therefore, in the present embodiment, the spunbonded non-woven fabric is located on the outside of the absorber 12, and the pulp fiber web is located on the backsheet 11 side surface of the absorber 12. However, vice versa, the spunbonded non-woven fabric and the pulp fiber web can exhibit almost the same function. As a result, the absorption capacity of the entire absorber 12 can be exhibited.

As the pulp fiber web, a pulp fiber or a non-woven fabric mainly composed of pulp fiber can be used without particular limitation, and a pulp fiber web formed by spraying pulp fiber on the surface of a spunbonded non-woven fabric by a water flow entanglement method may be used. The pulp fiber used here is not particularly limited, but is preferably coniferous 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 100 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 and the pulp fiber web in the composite nonwoven fabric 21 is preferably (weight of spunbonded nonwoven fabric / weight of pulp fiber web), for example, from the viewpoint of absorbability and diffusivity of body liquid. Is 40/60% by weight or more and 10/90% by weight or less. Within this range, the supportability of the pulp fiber web by the spunbonded non-woven fabric and the absorbency and body fluid diffusibility of the pulp fiber web are compatible at a high level in a well-balanced manner.

Further, with respect to the composite nonwoven fabric 21, 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 21 of the present embodiment includes, for example, a step of laminating and integrating a spunbonded nonwoven fabric and a pulp fiber web, and pressurizing and / or pressurizing the obtained laminate using a roll or the like as necessary. Alternatively, it can be produced by a production method including a step of heating. Further, the spunbonded non-woven fabric and the pulp fiber web may be integrated by using an adhesive or by sewing. The composite nonwoven fabric 21 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. The composite nonwoven fabric 21 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 The interval is preferably 0.4 mm or more and 1.0 mm or less.

(Three-dimensional gather)
The three-dimensional gather 14 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 14 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 11, 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. It includes a three-dimensional gather sheet 14b having a free end at the other end in the width direction, and an elastic elastic member 14a arranged near the other end (free end) in the width direction of the three-dimensional gather sheet 14b and extending in the longitudinal direction. By arranging the elastic elastic member 14a, the free end is provided with erectability, and the elastic elastic member 14a can be configured to be deformable according to the wearer's body shape. 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 absorber 12 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 11, near both ends in the width direction on the skin side surface of the top sheet 10.

For example, a polyurethane yarn, a strip-shaped polyurethane film, a filamentous or strip-shaped natural rubber, or the like is used as the elastic elastic member 14a for the three-dimensional gather, and the three-dimensional gather sheet 14b is a water-repellent or liquid formed of hydrophobic fibers. An impermeable non-woven fabric, for example, a spunbonded non-woven fabric, a melt-blown non-woven fabric, a three-layer laminated composite non-woven fabric of spunbonded non-woven fabric / melt-blow non-woven fabric / spunbonded non-woven fabric, or the like is used. The absorbent article 1 of the present embodiment also includes an embodiment that does not include the three-dimensional gather 14.

<Arbitrary configuration sheet>
The absorbent article 1 of the present embodiment may include a second sheet, a carrier sheet (both not shown) and the like as arbitrary constituent sheets.
The second sheet is arranged between the top sheet 10 and the perforated film 13, for example, in order to improve the liquid diffusivity of the absorbent article 1 and to soften the hardness of the perforated film 13 and improve the touch. Used for. The base material of the second sheet may be any material as long as the permeation rate of the body fluid is faster than that of the top sheet 10 and the body fluid is quickly diffused to the absorber 12, and for example, a hydrophilic non-woven fabric, particularly an air-through non-woven fabric is preferable. The thickness of the second sheet is preferably 0.1 mm or more, and the basis weight thereof is preferably 10 g / m ² or more and 60 g / m ² or less, and more preferably 15 g / m ² or more and 40 g / m ² or less. If the thickness is less than 0.1 mm, or the basis weight is ^{less than 10 g / m 2} or larger than 60 g / m ² , the body fluid tends not to be sufficiently diffused to the entire surface of the absorber 12 on the top sheet 10 side. be. The shape of the second sheet is not particularly limited, but it is preferably a shape that can completely cover the surface of the absorber 12 so that the body fluid diffuses all over the absorber 12.

In the present embodiment, a carrier sheet may be arranged between the perforated film 13 and the absorber 12. The base material of the carrier sheet may be any one having hydrophilicity, and a tissue containing pulp, absorbent paper, or the like is particularly preferable.

<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 absorbent main body 20 having an opening 23 formed in the longitudinal direction and the composite nonwoven fabric 21 are laminated. This is coated in a C shape with a perforated film 13 that has been bent along the unevenness of the surface to obtain an absorber 12 coated with the perforated film 13. Next, from the clothing side, the back sheet 11, the absorber 12 coated with the perforated film 13, and the top sheet 10 are laminated in this order, and the top sheet 10 and the back sheet 11 are hot-melt bonded over a part or the entire circumference. The absorbent article 1 can be manufactured by fixing the three-dimensional gather 14 at a predetermined position after fixing with an agent, heat embossing, ultrasonic embossing, high frequency embossing, or the like. 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 invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. Further, it is clear from the description of the 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.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

(Examples and comparative examples)
The absorber is made by mixing 6 g of a highly absorbent polymer in 7 g of fluff pulp, which is a base material, on a composite non-woven fabric (grain 80 g / m ^{2), and two slits (length 100 mm × width 5 mm) in the length direction.} , The absorption main body formed with an interval of 10 mm in the width direction was laminated. This absorber was wound in a C shape using a perforated film (with a basis weight of 26 g / m ² , L1 = 0.60 mm, number of 60 pieces / cm ^{2) with the side having a small opening diameter as the absorber side.} As the top sheet, using a air-through nonwoven fabric (basis weight 25 g / ^{m 2),} a liquid as impermeable backsheet, using breathable polyethylene sheet (basis weight 32 g / ^{m 2),} air-through nonwoven fabric as a second sheet (basis weight 30 g / ^{m 2 ), And a composite non-woven fabric (weight 15 g / m 2} ) which is a spunbond / meltblown / spunbond laminate was used as a three-dimensional gather. The dimensions of the absorbent article were 273 mm in the longitudinal direction and 105 mm in width, and the dimensions of the absorber were 220 mm in the longitudinal direction and 71 mm in width. The position and dimensions of the opening were shown in FIG. 1, and the dimensions of the opening were 100 mm in the length direction and 5 mm in the width direction, and the absorbent article of the example was prepared.

In Comparative Example, an absorbent article of Comparative Example was prepared in the same manner as in Example except that the composite non-woven fabric was replaced with tissue (basis weight 15 g / m ^2). ..

The following evaluation tests were carried out on the absorbent articles of Examples and Comparative Examples. The results are shown in Table 1.
(Absorption rate)
A measuring jig having an inner diameter of 19 mm and a weight of 755.6 g is placed in the center of a cylinder having a bottom area of 16.8 cm ^{2 in the longitudinal direction and the width direction of the absorbent article.} , 40 ml of physiological saline was dropped from the upper hole, and the time was measured from the time when the physiological saline came into contact with the absorbent article, starting from the point where the liquid was completely sucked into the circumference in the center circle of the jig.
(Liquid return amount)
After injecting 120 ml of physiological saline toward the center of the absorber and leaving it for 10 minutes, a filter paper (ADVANTEC No. 2 filter paper, diameter 55 mm) whose weight has been measured in advance is placed on the physiological saline injection site. A weight of 35 kgf / cm2 was placed on the filter paper, and after 60 seconds, the weight of the filter paper was measured, and the difference in the weight of the filter paper was taken as the amount of liquid return.
(Diffusion length)
After pouring 40 ml of physiological saline toward the center of the absorber and leaving it for 3 minutes, the distance at which the water diffuses is measured linearly from the water pouring position in the vertical direction of the product.

1 Absorbent article 10 Top sheet 11 Back sheet 12 Absorbent 13, 25, 25A Perforated film 14 Three-dimensional gather 14a Elastic elastic member 14b Three-dimensional gather sheet 20 Absorption body 21 Composite non-woven fabric 23 Opening

Claims (8)

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.
The absorber is
An absorbing body containing an absorbing component and having a slit extending in the longitudinal direction,
It is a laminate of a composite non-woven fabric arranged so as to be in contact with the backsheet side surface of the absorption body, and has an opening formed by the slit and the composite non-woven fabric.
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.
Holes arranged between the top sheet and the absorber so as to cover the top sheet side surface and side surface portions of the absorber, and the widthwise both ends of the back sheet side surface of the composite nonwoven fabric. With more film
The perforated film is an absorbent article having perforations in which the perforation diameter on one surface is relatively larger than the perforation diameter on the other surface. The first aspect of the present invention, wherein the perforated film further covers the absorber along the top sheet side surface of the composite nonwoven fabric exposed on the inner wall surface of the opening and the bottom surface of the opening. Absorbent article. The absorbent article according to claim 1 or 2, wherein the perforated film is arranged so that one surface of the perforated film having a relatively large perforated diameter faces the absorber. The absorbent article according to any one of claims 1 to 3, further comprising a second sheet arranged between the top sheet and the perforated film. The absorbent article according to claim 4, wherein the top sheet and the second sheet are both air-through non-woven fabrics. The absorption according to claim 4 or 5, wherein the ratio of the basis weight of the top sheet to the basis weight of the second sheet (the basis weight of the top sheet / the basis weight of the second sheet) is 50% or more and 130% or less. Sex goods. The perforated film is any one of claims 1 to 6, wherein the ratio of the total perforated area to the total area of the surface is 25% or more and 50% or less on the one surface having a relatively large perforated diameter. Absorbent articles described in the section. The opening film according to any one of claims 1 to 7, wherein the difference between the relatively large opening diameter and the relatively small opening diameter is 0.03 mm or more and 0.15 mm or less. Absorbent article.

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