JP7230300B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article that is thin, lightweight, and excellent in absorbency, and that can absorb on both sides.

Conventionally, it is mainly composed of an absorbent body containing fluff pulp and superabsorbent polymer (SAP), and it can absorb urine from both sides, and it can increase the absorption amount and prevent regurgitation after urination. Reduced absorbent articles have been used as double-sided absorbent pads.

In addition, the absorbent laminate does not contain pulp fibers other than nonwoven fabrics, and two nonwoven fabrics are bonded by a net layer made of a hot melt adhesive provided between the nonwoven fabrics. Absorbent laminates for disposable products have been developed with attached SAPs.
There are the following prior arts for absorbent articles containing double-faced pads and SAP sheets.

Japanese Unexamined Patent Application Publication No. 2002-200000 discloses a double-sided absorbent pad, which is mainly composed of an absorbent body containing fluff pulp and SAP. A reduced water absorption article is disclosed.
Japanese Unexamined Patent Application Publication No. 2002-200002 discloses an absorbent laminate having a shape that is ultra-thin, does not lose its shape after absorbing water, and can sufficiently exhibit its absorbent capacity.

JP-A-2015-58174 JP-A-2000-238161

However, in Japanese Unexamined Patent Application Publication No. 2002-100001, even if both surfaces are covered with fluff, it becomes thick and impairs the feeling of wearing.
In addition, in JP-A-2003-200032, even though the absorbent article is thin, the absorption is performed only on one side, so the absorption performance is not sufficient, and the use of a hot-melt adhesive results in a hard absorbent body, which impairs the feeling of wearing. is problematic and unsatisfactory.

Therefore, the present invention has been made in view of the above problems, and is made of an absorbent body that does not contain fluff pulp, is thin, does not impair the feeling of wearing even when multiple layers are used, and is lightweight. Absorption is possible on both sides, and by carrying SAP between the raised non-woven fabrics without using hot-melt, the surface that touches the skin is less affected by the unevenness of the SAP, and is excellent in complementing the absorption performance of the outerwear. An object is to provide an absorbent article.

The inventors of the present invention conducted extensive research in view of the above problems. As a result, a first absorbent body having a first base nonwoven fabric having a raised clothing-side surface and a first superabsorbent polymer fixedly supported between fibers of the raised portion of the first base nonwoven fabric, and a body-side surface having The above problem can be solved by providing a second absorbent body having a raised second base nonwoven fabric and a second superabsorbent polymer fixedly supported between fibers of the raised portion of the second base nonwoven fabric. The discovery led to the completion of the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is an absorbent article comprising a liquid-permeable topsheet, a liquid-permeable backsheet, and an absorbent layer between the topsheet and the backsheet, The absorbent layer is positioned on the top sheet side, and includes a first base nonwoven fabric having a raised surface on the backsheet side and a first superabsorbent polymer fixedly supported between fibers of the raised portion of the first base nonwoven fabric. a second base nonwoven fabric located on the backsheet side and raised on the topsheet side surface; and a second base nonwoven fabric fixedly supported between fibers of the raised portion of the second base nonwoven fabric and a second absorbent body comprising an absorbent polymer.

(2) A second aspect of the present invention is the absorbent article according to (1), wherein the first and second base nonwoven fabrics are air-through nonwoven fabrics, and the basis weights of the first and second base nonwoven fabrics are is 20 g/m ² or more and 200 g/m ² or less, and the thickness of the first and second base nonwoven fabrics is 0.3 mm or more and 11.0 mm or less, constituting the first and second base nonwoven fabrics The thickness of the fiber is characterized by being 1.6 dtex or more and 14 dtex or less.

(3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the basis weights of the first and second superabsorbent polymers are 200 g/m2 or more and 1200 g/m2 or ^more. It is characterized by being m ² or less.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the first and second superabsorbent polymers are formed by a hot melt adhesive, It is fixedly supported between the fibers of the raised portions of the first and second base nonwoven fabrics, and the content of the hot melt adhesive is 10 g/m ² or less.

According to the present invention, the nonwoven fabric is thin, does not impair the wearing feeling even when multiple layers are used, is lightweight, and can be absorbed on both sides, and supports SAP between the raised nonwoven fabrics without using hot melt. As a result, it is possible to provide an absorbent article excellent in complementing the absorption performance of the outer, in which the surface that comes into contact with the skin is not easily affected by the unevenness of the SAP.

1 is a plan view of an absorbent article according to an embodiment of the present invention; 2 is a cross-sectional view taken along line X ₁ -X ₁ of FIG. 1; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

<Absorbent article>
As the absorbent article 1 according to the embodiment of the present invention, a light incontinence pad is exemplified, but the absorbent article 1 of the present invention is not limited to this, and includes a light incontinence liner, a sanitary napkin, and other absorbent articles. It may be an absorbent article.
1 is a plan view of an absorbent article 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line X1-X1 of FIG. As shown in FIG. 1, the absorbent article 1 comprises a liquid-permeable top sheet 10 arranged on the body-side surface and a liquid-permeable back sheet 20 arranged on the clothing-side surface facing the top sheet 10. and an absorbent layer disposed between the topsheet 10 and the backsheet 20. Thereby, the absorbent layer has a structure sandwiched between the top sheet 10 and the back sheet 20 .
Specifically, the absorbent layer has a structure including, in order from the top sheet 10 side, a first absorbent body 30 and a second absorbent body 50 .

In the description of this specification, the longitudinal direction of the absorbent article 1 is the direction across the front and back of the wearer when the absorbent article 1 is worn, and is the direction indicated by symbol Y in the drawing. Moreover, the width direction of the absorbent article 1 is a direction that is transverse or perpendicular to the longitudinal direction, and is the direction indicated by symbol X in the drawing. Furthermore, in the description of this specification, the body-side surface refers to the surface of each member that faces the wearer's skin when worn, and the clothing-side surface refers to both the front and back surfaces of each member. Of these, the side facing away from the wearer's skin when worn.

The absorbent article 1 preferably has a longitudinal dimension of 100 mm or more and 600 mm or less and a width direction dimension of 30 mm or more and 200 mm or less. By adjusting the dimensions of the absorbent article 1 within the above range, the absorbent article 1 suitable for light incontinence pads, light incontinence liners, sanitary napkins, relatively small incontinence pads, etc. can be obtained.

[Top sheet]
The top sheet 10 is liquid-permeable to allow bodily fluids to pass quickly toward the absorbent body 30 , and is arranged to face the back sheet 20 with the absorbent body 30 interposed therebetween. Since the top sheet 10 is a sheet that comes into contact with the skin, it has a soft feel and does not irritate the skin. Hydrophilic nonwoven fabric such as nonwoven fabric, composite nonwoven fabric laminated with thermal bond/spunbond, open film such as open polyethylene film, foam film such as urethane foam, or composite sheet laminated with these. It is preferable to use a hydrophilic thermal bonded nonwoven fabric or a hydrophilic spunbonded nonwoven fabric, which is easy to obtain and has excellent flexibility.
The top sheet 10 may be a single layer or a laminate of a plurality of layers, and may have a large number of through-holes to impart dry touch properties.

The basis weight of the top sheet 10 is preferably 13 g/m ² or more and 40 g/m ^{2 or} less in terms of workability and strength. The top sheet 10 may be coated with a lotion, an antioxidant, an anti-inflammatory ingredient, a pH adjuster, an antibacterial agent, a moisturizing agent, or the like, in order to reduce irritation to the skin.

[Back sheet]
(Reference Example) As the back sheet 20 used in the present invention, a sheet material having liquid impermeability and water impermeability is used, but it may have moisture permeability to prevent stuffiness. Examples of materials for the back sheet 20 having such properties include thin plastic sheets such as polyethylene sheets and polyethylene-laminated nonwoven fabrics. The basis weight of the backsheet 20 is preferably 15 g/m ² or more and 60 g/m ^{2 or} less from the viewpoint of workability and strength.

Although not shown, the garment-side surface of the back sheet 20 may be provided with an adhesive layer for adhering the absorbent article 1 to underwear or the like when worn. In addition, when the absorbent article 1 has an adhesive layer, it may have a release sheet for protecting the adhesive layer, and this release sheet is partially bonded to the packaging sheet of the absorbent article 1. may be

[Absorbing layer]
The absorbent layer used in the absorbent article 1 of the present invention has a structure including a first absorbent body 30 positioned on the top sheet 10 side and a second absorbent body 50 positioned on the back sheet 20 side, as shown in FIG. It has become.
The first absorbent body 30 consists of a first base nonwoven fabric 31 having a raised surface on the side of the garment (back sheet 20 side) and a first superabsorbent nonwoven fabric 31 fixedly supported between the fibers of the raised portion of the first base nonwoven fabric 31. a polymer 32;
The second absorbent body 50 consists of a second base nonwoven fabric 51 having a raised surface on the body side (top sheet 10 side) and a second superabsorbent polymer 52 fixedly held between the fibers of the raised portion of the second base nonwoven fabric 51. and have
Since neither the upper layer absorbent body 30 nor the lower layer absorbent body 50 contains fluff pulp, the absorbent layer does not become thick, and a thin absorbent article 1 can be obtained.

In the first absorbent body 30 and the second absorbent body 50, the first superabsorbent polymer 32 and the second superabsorbent polymer 52 are formed between the fibers of the raised portions of the first base nonwoven fabric 31 and the second base nonwoven fabric 51, respectively. By being dispersed and fixedly supported, the urine is appropriately diffused or held in the napped portion of each base nonwoven fabric, thereby improving the absorption performance and providing sufficient absorption performance even without fluff pulp.

(First absorber and second absorber)
As shown in FIG. 2, the first absorbent body 30 consists of a first base nonwoven fabric 31 having a raised surface on the clothing side and a first superabsorbent polymer fixedly supported between the fibers of the raised portion of the first base nonwoven fabric 31. 32, and the second absorbent body 50 comprises a second base nonwoven fabric 51 having a raised surface on the body side and a second superabsorbent polymer fixedly supported between the fibers of the raised portion of the second base nonwoven fabric 51. 52 and . In this way, each superabsorbent polymer is dispersed and fixedly supported between the fibers of the raised portion of each base nonwoven fabric, and urine is appropriately diffused or retained in the raised portion of each base nonwoven fabric. Absorption performance is improved, and it has sufficient absorption performance even without fluff pulp. In addition, it is preferable that the longitudinal dimension of the first absorbent body 30 and the second absorbent body 50 is 95 mm or more and 550 mm or less, and the width direction dimension is 25 mm or more and 180 mm or less.

(First base nonwoven fabric and second base nonwoven fabric)
As shown in FIG. 2, the garment-side surface of the first base nonwoven fabric 31 and the body-side surface of the second base nonwoven fabric 51 are in a raised state. Therefore, in addition to the original bulkiness of the nonwoven fabric, the first absorbent body 30 and the second absorbent body 50 are given appropriate thickness and softness, thereby generating appropriate cushioning properties and providing a fit feeling when worn. can be improved.
Further, by raising each base nonwoven fabric as described above, each superabsorbent polymer can be dispersed between the fibers of the raised portion of each base nonwoven fabric and fixedly carried thereon. Methods for raising the clothing-side surface of the first base nonwoven fabric 31 and the body-side surface of the second base nonwoven fabric 51 include a rotary saw blade and needle punch. It is preferred to use the method of fluffing.

Examples of the first base nonwoven fabric 31 and the second base nonwoven fabric 51 include nonwoven fabrics such as air-through nonwoven fabrics, point-bond nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond nonwoven fabrics/meltblown nonwoven fabrics, spunbond nonwoven fabrics/meltblown nonwoven fabrics/spunbond nonwoven fabrics. A composite nonwoven fabric obtained by laminating nonwoven fabrics can be mentioned. Among these nonwoven fabrics, it is preferable to use an air-through nonwoven fabric, which is easy to obtain bulkiness.

The thickness of the first base nonwoven fabric 31 and the second base nonwoven fabric 51 is preferably 0.3 mm or more and 11.0 mm or less, and more preferably 2.0 mm or more and 9.0 mm or less, from the viewpoint of the balance between wearing comfort and absorption performance. It is more preferable to be 4.0 mm or more and 9.0 mm or less. The basis weight of the first base nonwoven fabric 31 and the second base nonwoven fabric 51 is preferably 20 g/m ² or more and 200 g/m ² or less, more preferably 30 g/m ² or more and 160 g/m ² or less. .

Furthermore, the thickness of the fibers constituting the first base nonwoven fabric 31 and the second base nonwoven fabric 51 is preferably 1.6 dtex or more and 14.0 dtex or less, more preferably 1.8 dtex or more and 9.0 dtex or less. , 2.0 dtex or more and 6.0 dtex or less. By adjusting the thickness of the fibers constituting the first base nonwoven fabric 31 and the second base nonwoven fabric 51 within the above range, each superabsorbent polymer is dispersed between the fibers of the raised portion of each base nonwoven fabric. It is possible to make it easier to stick and carry.

(First Super Absorbent Polymer and Second Super Absorbent Polymer)
The first superabsorbent polymer 32 and the second superabsorbent polymer 52 are not particularly limited as long as they can absorb urine and prevent backflow. Sodium polyacrylate, polyaspartate, Those formed from materials such as (starch-acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified products thereof can be used. . Among these, the sodium polyacrylate type is preferable from the viewpoint of the absorption amount per weight. In addition, the basis weights of the first superabsorbent polymer 32 and the second superabsorbent polymer 52 are 200 g/m ² or more and 1200 g/m ² or less in order to ensure the absorption performance required for various absorbent articles. preferably. In addition, from the viewpoint of further improving the absorption performance, the touch after absorption, and the ease of movement of the wearer, the basis weights of the first superabsorbent polymer 32 and the second superabsorbent polymer 52 are 300 g/m2 or more and 900 g/m2 or ^more. m ² or less is more preferable.

In addition, by avoiding fine powder with poor fluidity as powder, the basic performance related to absorption is enhanced, and the rough feel caused by hardening of the first absorbent body 30 and the second absorbent body 50 is reduced. From the viewpoint of the above, the median particle size of the first superabsorbent polymer 32 and the second superabsorbent polymer 52 is preferably 50 μm or more and 600 μm or less, more preferably 100 μm or more and 500 μm or less.

The first superabsorbent polymer 32 and the second superabsorbent polymer 52 are fixedly supported between the fibers of the raised portions of the first base nonwoven fabric 31 and the second base nonwoven fabric 51, respectively, by a hot-melt adhesive. Preferably, when the base nonwoven fabric has a relatively low basis weight (20 g/m ² or more and 100 g/m ² or less), the hot melt adhesive functions particularly effectively to reinforce the fixed support of each superabsorbent polymer. do.

In addition, the content of the hot-melt adhesive is 10 g/m ² or less so as not to impair the absorbency of the first super-absorbent polymer 32 and the second super-absorbent polymer 52 and not to impair the touch when worn. and more preferably 1 g/m ² or more and 8 g/m ² or less. Hot melt adhesives include synthetic rubbers such as styrene-butadiene-styrene copolymers and styrene-isoprene-styrene copolymers, or ethylene-vinyl acetate copolymers with a melting point of 100° C. or higher and 180° C. or lower. An olefin-based hot-melt adhesive such as can be used. As a method for applying the hot-melt adhesive, known methods such as a curtain coating method and a spiral method in which the hot-melt adhesive in a molten state is applied from a nozzle in a non-contact manner, and a slot method in which the adhesive is applied in a contact manner can be used.

[Carrier sheet]
The absorbent article 1 of the present invention may have a carrier sheet 60 . The carrier sheet 60 may cover the first absorbent body 30 and the second absorbent body 50 so as to integrally wrap the whole, and the carrier sheet 60 may cover the body side of the first absorbent body 30 and the clothing side of the second absorbent body 50 . It may be covered so as to be integrally sandwiched.
In addition, the first absorbent body 30 and the second absorbent body 50 may be individually covered so as to wrap their entirety, or the first absorbent body 30 and the second absorbent body 50 may be sandwiched from above and below. may be covered with

By providing the carrier sheet 60 in such a manner, the shapes of the first absorbent body 30 and the second absorbent body 50 can be maintained, and in addition, the first superabsorbent polymer 32 and the second superabsorbent polymer 52 can be prevented from leaking out of each absorber.
Examples of the carrier sheet 60 include tissue, absorbent paper, and hydrophilic nonwoven fabric such as spunbond nonwoven fabric and air-laid nonwoven fabric. The basis weight is preferably 10 g/m ² or more and 40 g/m ² or less, more preferably 15 g/m ² or more and 20 g/m ^{2 or} less, from the viewpoint of strength and wearing comfort. In this embodiment, an example in which the absorbent layer is wrapped with the carrier sheet 60 has been described, but the absorbent layer may not be wrapped with the carrier sheet.

[Liquid diffusion sheet]
In the absorbent article 1 of the present invention, as shown in FIG. 2, a liquid diffusible material is provided between the top sheet 10 and the first absorbent body 30 in order to promote the diffusion of body fluids to the upper surface of the first absorbent body 30 . A seat 70 is provided. Examples of the liquid-diffusing sheet 70 include hydrophilic nonwoven fabrics such as air-through nonwoven fabrics, point-bonded nonwoven fabrics, spunbonded nonwoven fabrics, and meltblown nonwoven fabrics, and composite nonwoven fabrics in which spunbond/meltblown and spunbond/meltblown/spunbond are laminated. can be mentioned. The liquid diffusion sheet 70 preferably has a thickness of 0.1 mm or more and 2 mm or less, and a basis weight of 15 g/m ² or more and 100 g/m ^{2 or} less. The shape of the liquid-diffusing sheet 70 is not particularly limited, but it should be a shape that can completely cover the body-side surface of the first absorbent body 30 so that liquid such as urine can be diffused all over the first absorbent body 30 . Preferably.

[Three-dimensional gather]
A body-side surface of the absorbent article 1 is preferably provided with three-dimensional gathers 80 . The three-dimensional gathers 80 together with the top sheet 10 form a space for confining bodily fluids, thereby preventing leakage of bodily fluids. The three-dimensional gathers 80 preferably include a three-dimensional gathers sheet and a stretchable elastic member arranged along the free end of the three-dimensional gathers sheet. As the stretchable elastic member, a thread-like, string-like, or flat-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be used as appropriate.

<Method for manufacturing absorbent article>
The manufacturing method of the absorbent article 1 is not particularly limited, and conventionally known methods can be adopted. The elastic sheet 70 and the top sheet 10 are laminated in this order, and the top sheet 10 and the back sheet 20 are partially or entirely fixed using a hot-melt adhesive, heat embossing, ultrasonic embossing, high-frequency embossing, or the like. can be manufactured in Then, after individually wrapping this in a packaging sheet, it may be folded into three in the longitudinal direction.

According to the embodiment of the present invention, even if it is thin and light, it can supplement the absorption capacity of the outer because it absorbs on both sides. In addition, since it is thin and lightweight, it does not impair the feeling of wearing even if a plurality of them are used in layers. As a result, the absorber does not contain fluff pulp, is thin, does not impair the feeling of wearing even when multiple layers are used, is lightweight, can absorb on both sides, and is raised without using hot melt. By carrying SAP between non-woven fabrics, a double-faced pad excellent in complementing the absorption performance of the outer, in which the surface that comes in contact with the skin is less susceptible to the unevenness of the SAP, can be obtained.

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 can be made to the above embodiments. It is clear to those skilled in the art that In addition, it is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

1 Absorbent Article 10 Top Sheet 20 Back Sheet 30 First Absorbent Body 31 First Substrate Nonwoven Fabric 32 First Super Absorbent Polymer 50 Second Absorbent Body 51 Second Sub Nonwoven Fabric 52 Second Super Absorbent Polymer 60 Carrier Sheet 70 Liquid Diffusion sex sheet 80 three-dimensional gathers

Claims (4)

An absorbent article capable of absorbing on both sides, comprising a liquid-permeable top sheet, a liquid-permeable back sheet, and an absorbent layer between the top sheet and the back sheet,
The absorbent layer is positioned on the top sheet side, and includes a first base nonwoven fabric having a raised surface on the backsheet side and a first superabsorbent polymer fixedly supported between fibers of the raised portion of the first base nonwoven fabric. a second base nonwoven fabric located on the backsheet side and raised on the topsheet side surface; and a second base nonwoven fabric fixedly supported between fibers of the raised portion of the second base nonwoven fabric a second absorbent body having an absorbent polymer ;
The first and second base nonwoven fabrics are air-through nonwoven fabrics,
The basis weights of the first and second base nonwoven fabrics are 20 g/m ² or more and 200 g/m ² or less,
The thickness of the first and second base nonwoven fabrics is 0.3 mm or more and 11.0 mm or less,
The thickness of the fibers constituting the first and second base nonwoven fabrics is 1.6 dtex or more and 14 dtex or less,
The median particle size of the first and second superabsorbent polymers is 100 μm or more and 500 μm or less,
The basis weight of the first and second superabsorbent polymers is 200 g/m ² or more and 1200 g/m ² or less,
The first and second superabsorbent polymers are fixedly supported between the fibers of the raised portions of the first and second base nonwoven fabrics by a hot melt adhesive, and the content of the hot melt adhesive is 10 g. / m ² or less,
A liquid-diffusing sheet having a thickness of 0.1 mm or more and 2 mm or less and a basis weight of 15 g/m ² or more and 100 g/m ^{2 or} less is provided between the top sheet and the first absorbent body. An absorbent article that complements the absorbent performance of the outer , characterized by: The basis weights of the first and second base nonwoven fabrics are 30 g/m ² or more and 160 g/m ² or less ,
The thickness of the first and second base nonwoven fabrics is 4.0 mm or more and 9.0 mm or less ,
2. The absorbent article according to claim 1, wherein the fibers constituting said first and second base nonwoven fabrics have a thickness of 2.0 dtex or more and 6.0 dtex or less . The absorbent article according to claim 1 or 2, wherein the basis weight of the first and second superabsorbent polymers is 300 g/m2 ^or more and 900 g/m2 ^or less . The absorbent article according to any one of claims 1 to 3, wherein the content of said hot-melt adhesive is 1 g/m2 ^or more and 8 g/m2 ^or less .

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