JP2021132733A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article having an external appearance similar to that of a cloth underwear, excellent in feeling, and hardly causing stuffiness and skin trouble.SOLUTION: An underpants type absorbent article 1 which comprises: an absorbent body 20 including a liquid permeable top sheet 21, a liquid impermeable back sheet 22, and an absorber 23 arranged therebetween; and an exterior body 10 supporting the absorbent body 20, and divided into a ventral part 11, a crotch part 13 and a back side part 12 is such that: the ventral part 11 and the back side part 12 each include a composite sheet 17; the composite sheet 17 comprises a plurality of cotton-containing composite nonwoven fabrics 14, elastic films 15 arranged between the cotton-containing composite nonwoven fabrics 14, and a plurality of adhesion parts 30 separated from each other in a surface direction and integrating the cotton-containing composite nonwoven fabrics 14 and the elastic films 15; and the cotton-containing composite nonwoven fabrics 14 include nonwoven fabrics, and cotton fiber layers laminated on the surfaces of the nonwoven fabrics.SELECTED DRAWING: Figure 3

Description

The present invention relates to pants-type absorbent articles.

In the conventional pants-type absorbent article 100 shown in FIG. 6, elastic elastic members such as rubber threads are arranged around the abdomen, waist, buttocks, etc. in order to obtain ease of wearing and good fit during wearing. (Patent Document 1). The arrangement of the elastic elastic member forms gathers 110, 111 and wrinkles having a relatively large area, which are major features in the appearance of the pants-type absorbent article 100. These make a big difference in appearance from cloth underwear. In particular, the rubber thread that can be seen through the abdomen and hips and the large number of large wrinkles that occur around it do not exist in the cloth underwear. For the wearer who wants to keep the wearing of the pants-type absorbent article secret from a third party, the above-mentioned difference in appearance is not desirable. Therefore, there is a strong demand for pants-type absorbent articles having an appearance closer to that of cloth underwear.

In order to improve the appearance problem of the pants-type absorbent article, a composite sheet in which a non-woven fabric as a surface material and an elastic film are laminated is proposed as an exterior body. Patent Document 2 is a laminate of a spunbonded non-woven fabric and a stretchable film that can be stretched in two orthogonal directions as an exterior body of a diaper and a personal care product, and the stretchable film is polyurethane, polyetheramide, and polyester. Disclosed is a biaxially elastic stretchable breathable composite sheet, which is a film containing one or more polymers selected from the group consisting of elastomers.

Japanese Unexamined Patent Publication No. 10-137287 Japanese Unexamined Patent Publication No. 2008-279774

Pants-type absorbent articles with a conventional composite sheet as the exterior are made of natural fibers such as cotton and silk because the appearance of the pants-type absorbent article is similar to that of cloth underwear, but all the materials that make up the composite sheet are synthetic resins. It is inferior to cloth underwear in terms of texture and sweat absorption, and has the problem of being easily stuffy. On the other hand, natural fibers may also contain protein-based components that easily cause a rash on wearers with high skin sensitivity, and the use of natural fibers is not always good for pants-type absorbent articles. Is not always given.

An object of the present invention is to provide a pants-type absorbent article which has an appearance similar to that of cloth underwear, has a good texture, and is less likely to cause skin troubles such as itchiness and rash due to stuffiness, while using the composite sheet as an exterior body. ..

As a result of intensive research to solve the above problems, the present inventor uses a predetermined cotton-containing composite non-woven fabric as a surface material, and uses a composite sheet in which the composite non-woven fabric and an elastic film are laminated as an exterior body. As a result, they have found that a desired pants-type absorbent article can be obtained, and have completed the present invention. The present invention provides, for example, the following pants-type absorbent articles (1) to (5) as a preferred embodiment.

(1) A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent main body including an absorber arranged between the top sheet and the back sheet, and the absorbent main body are supported. A pants-type absorbent article comprising an exterior body divided into a ventral portion, a crotch portion, and a dorsal portion, wherein the ventral portion and the dorsal portion each include a composite sheet, and the composite sheet includes a composite sheet. A plurality of cotton-containing composite non-woven fabrics, a stretchable film arranged between the cotton-containing composite non-woven fabrics, and a plurality of the cotton-containing composite non-woven fabrics and the stretchable film are integrated with each other separated from each other in the plane direction. The cotton-containing composite nonwoven fabric comprises a non-woven fabric and a cotton fiber layer laminated on at least one surface of the nonwoven fabric.
(2) In the exterior body, the basis weight per one piece of the cotton-containing composite non-woven fabric is 40 g / m ² or more and 60 g / m ² or less, the non-woven fabric is a spunbonded non-woven fabric, and the spunbonded non-woven fabric and the cotton. The pants-type absorbent article according to (1) above, wherein the weight composition ratio with the fiber layer is 40/60% by weight or more and 10/90% by weight or less.
(3) The pants-type absorbent article according to (1) or (2) above, wherein the composite sheet is an integrated product including the bonded portion by heat fusion and / or ultrasonic bonding.
(4) The pants-type absorbent article according to any one of (1) to (3) above, wherein the composite sheet has an elongation rate of 150% or more and 270% or less in the expansion and contraction direction.
(5) The pants-type absorbent article according to any one of (1) to (4) above, further comprising an elastic elastic member arranged from the ventral side to the dorsal side through the crotch part.

According to the present invention, there is provided a pants-type absorbent article that uses a composite sheet as an exterior body, has an appearance similar to that of cloth underwear, has a good texture, and is less likely to cause stuffiness or allergies.

It is a perspective view which shows typically the appearance of the pants type absorbent article which concerns on 1st Embodiment of this invention. It is a schematic development view of the pants type absorbent article shown in FIG. It is a schematic cross-sectional view in the width direction in the XX'cutting line of FIG. It is a schematic plan view showing an enlarged example of each embodiment of an adhesive part and the arrangement pattern thereof. It is the schematic which shows one Embodiment of the manufacturing example of a composite sheet. It is a perspective view which shows the appearance of the conventional pants type absorbent article.

Hereinafter, the pants-type absorbent article 1 according to the first embodiment will be described with reference to the drawings. In the present specification, it is defined as follows. Wearing the pants-type absorbent article 1 means a state in which the pants-type absorbent article 1 is worn on the body before, during, and after the absorption of the body fluid. The longitudinal direction is a direction extending in front of and behind the wearer when the pants-type absorbent article 1 is worn, the width direction is a direction orthogonal to the longitudinal direction, and the thickness direction includes the longitudinal direction and the width direction. The direction is substantially perpendicular to the plane (for example, the plane shown in FIG. 2). When the pants-type absorbent article 1 is worn on the body, the surface that comes into contact with the wearer's skin or faces the skin is the side of the skin, and the surface that touches the wearer's clothing or faces the clothing is the non-skin side. , And. The body fluid refers to a liquid excreted from the body such as urine, blood, and water in loose stool.

<Pants type absorbent article>
FIG. 1 is an external perspective view of the pants-type absorbent article 1, FIG. 2 is a schematic development plan view of the pants-type absorbent article 1, and FIG. 3 is a width sectional view of the pants-type absorbent article 1. .. Each figure does not define the shape, size, and size relationship of each component such as the exterior body 10 of the pants-type absorbent article 1 and the absorbent body 20. The dimensions of each component can be appropriately selected from a wide range according to the use of the pants-type absorbent article 1, the age and body shape of the wearer, and the like. Although each layer of the constituent members is laminated without gaps in FIG. 3, the present embodiment also includes an embodiment having at least one gap between at least one layer.

As shown in FIGS. 1 to 3, the pants-type absorbent article 1 of the present embodiment is supported by the outer body 10 constituting the outer shape thereof and a predetermined area of the outer body 10, and the crotch portion of the wearer is moved back and forth. It is provided with an absorbent main body 20 having a substantially band-shaped shape in the front-rear direction covering from the above. The exterior body 10 is located between the ventral portion 11 that mainly contacts the wearer's abdomen, the dorsal portion 12 that mainly contacts the wearer's back, and the ventral portion 11 and the dorsal portion 12. The crotch portion 13 which mainly abuts on the crotch portion of the wearer is included. The exterior body 10 mainly supports the absorbent main body 20 on the skin side surface of the inseam 13, and is arranged so that a part or all of the absorbent main body 20 overlaps the inseam 13. The absorbent body 20 absorbs and retains the wearer's body fluids.

The unfolded longitudinal dimension of the pants-type absorbent article 1 as shown in FIG. 2 is, for example, 600 mm or more and 1000 mm or less, and the width direction dimension is, for example, 450 mm or more and 900 mm or less. The pants-type absorbent article 1 having the unfolded dimensions has an elastic elastic member arranged in a predetermined area as needed, and then has various sizes of pants-type absorbent articles such as S size, M size, and L size. It can be article 1. The pants-type absorbent article 1 can be used as, for example, a paper diaper, a sanitary napkin, a disposable diaper for incontinence, or the like.
Hereinafter, each component of the pants-type absorbent article 1 of the present embodiment will be described in more detail in the order of the absorbent main body 20 and the exterior body 10.

<Absorbable body>
The absorbent body 20 of the present embodiment has a liquid-permeable top sheet 21 relatively arranged on the skin side and a liquid-impermeable top sheet 21 arranged relatively on the non-skin side facing the top sheet 21. The absorbent body 23 includes the sex back sheet 22, the absorber 23 arranged between the top sheet 21 and the back sheet 22, and the three-dimensional gathers 24, and the absorber 23 is sandwiched between the top sheet 21 and the back sheet 22. Has a structure. The absorbent body 20 is arranged mainly on the skin side surface of the crotch portion 13 of the exterior body 10 so as to extend from the ventral side portion 11 toward the dorsal side portion 12. The absorbent body 20 is fixed to the exterior body 10 by an adhesive such as hot melt, heat fusion, ultrasonic bonding, or the like.

(Top sheet)
As the top sheet 21 of the present embodiment, a base material having a liquid permeability such that the body liquid moves to the absorber 23 can be used without particular limitation. For example, a non-woven fabric such as a thermal-bonded non-woven fabric, a thermal-bonded non-woven fabric / spunbond Examples thereof include a composite non-woven fabric which is a laminated body of non-woven fabric, an open film such as an open polyethylene film, a foam film such as polyethylene foam and urethane foam, and a multi-layer sheet in which two or more of these are laminated. Further, it is preferable that the surface of the top sheet 21 is embossed or perforated in order to improve the liquid permeability. As the processing method, a known method can be performed without limitation. Further, in order to reduce irritation to the skin, it is also preferable that the top sheet 21 contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer and the like. Further, from the viewpoint of strength and workability, the basis weight of the top sheet 21 is, for example, in the range of ^{14 g / m 2} or more and 40 g / m ^{2 or less.} The shape of the top sheet 21 is not particularly limited, but may be any shape that covers the absorber 23 in order to guide a liquid such as urine to the absorber 23.

(Back sheet)
As the back sheet 22 of the present embodiment, a liquid-impermeable base material that does not leak the body fluid held by the absorber 23 can be used without particular limitation. For example, a non-woven fabric, a resin film, or a laminate of two or more of these can be used. Examples include a multi-layer sheet that is a body. The non-woven fabric is not particularly limited in the manufacturing method, and examples thereof include spunbonded non-woven fabrics, melt-blown non-woven fabrics, spunbonded non-woven fabrics / melt-blow non-woven fabric laminates, spunbonded non-woven fabrics / melt-blow non-woven fabrics / spunbonded non-woven fabric laminates, and the like. Examples of the resin film include a polyester film, a polyvinyl alcohol film, a polyethylene film, a polypropylene film, and a composite sheet which is a laminate of polyethylene and polypropylene. Further, in order to prevent stuffiness during wearing, the back sheet 22 preferably has moisture permeability. Examples of the method of imparting moisture permeability include blending a filler in the resin film of the base material and embossing the back sheet 22 for perforation. The basis weight of the back sheet 22 is not particularly limited, but is, for example, in the range of ^{15 g / m 2} or more and 60 g / m ^{2 or less.}

(Absorber)
The absorber 23 of the present embodiment includes, for example, an absorbing base material and an absorbing component supported on the absorbing base material. As the absorbent base material, an absorbent base material contained in an absorbent article such as a sanitary napkin, a diaper, or a urine pad can be generally used without particular limitation, and examples thereof include flap pulp and a hydrophilic sheet. Examples of the flap pulp include cotton-like defibrated products such as wood pulp, synthetic fiber, and non-wood pulp such as synthetic resin fiber. Examples of the hydrophilic sheet include wipes, absorbent paper, hydrophilic non-woven fabric and the like. Further, the spread fiber of acetate tow can be used as an absorbent base material. As the absorbing component, a known one can be used without particular limitation, and examples thereof include a super absorbent polymer (hereinafter, also referred to as “SAP”). As the highly absorbent polymer, known ones can be used, and among them, polyacrylate is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of body fluid absorbed per area.

The absorber 23 is formed in the form of a single-layer or multi-layer sheet using, for example, the above-mentioned absorbing base material and absorbing component. Among these, those formed by mixing the hydrophilic fiber matrix of the web of fluff pulp with SAP particles, such as wood pulp fluff, are preferable. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 23, it is preferable to wrap the absorber 23 in a hydrophilic sheet (not shown) such as tissue. Further, it is preferable to emboss the surface of the absorber 23 because the diffusion of the body fluid is controlled and the absorber 23 is easily deformed according to the body shape of the user. The basis weight of the highly absorbent polymer in the absorber 23 is not particularly limited, but is, for example, in the range of ^{50 g / m 2} or more and 500 g / m ^{2 or less.}

(Three-dimensional gather)
The three-dimensional gather 24 is provided, for example, to prevent lateral leakage of body fluid. In the three-dimensional gather 24 of the present embodiment, one end in the width direction is fixed along the longitudinal direction near both ends in the width direction of the skin side surface of the back sheet 22, and the middle portion in the width direction is near both ends in the width direction of the skin side surface of the top sheet 21. A three-dimensional gather sheet 24b fixed along the longitudinal direction and having a free end at the other end in the width direction, and an arrangement along the longitudinal direction near the other end (free end) in the width direction and standing at the other end in the width direction. Includes an elastic stretchable member 24a for three-dimensional gathers that imparts properties. The other end in the width direction, which has erectability, can be expanded and contracted and deformed according to the wearer's body shape.

For the three-dimensional gather sheet 24b, for example, various non-woven fabrics can be used without limitation, and for the elastic elastic member 24a for three-dimensional gather, a general elastic elastic member such as thread rubber can be used without particular limitation. It should be noted that one end (fixed end) in the width direction of the three-dimensional gather sheet 24b joins the peripheral edge of the top sheet 21 and the peripheral edge of the back sheet 22 near both ends in the width direction of the skin side surface of the back sheet 22 to include the absorber 23. It may be fixed along the longitudinal direction to any of the vicinity of both ends in the width direction of the bag body, the vicinity of both ends in the width direction of the skin side surface of the top sheet 21, and the vicinity of both ends in the width direction of the non-skin side surface of the back sheet 22. The absorbent body 20 of this embodiment also includes an embodiment that does not include the three-dimensional gather 24.

<Exterior body>
The exterior body 10 is formed between the ventral portion 11 that mainly abuts on the ventral side of the wearer, the dorsal portion 12 that mainly abuts on the dorsal side of the wearer, and the ventral portion 11 and the dorsal portion 12. It has a crotch portion 13 that intervenes and mainly abuts on the crotch portion of the wearer, and mainly supports the absorbent body 20 on the skin surface side of the crotch portion 13. Further, as shown in FIGS. 2 and 3, the exterior body 10 of the present embodiment has a pair of left and right leg gathers extending from the ventral side portion 11 to the dorsal side portion 12 through the crotch portion 13 along the widthwise end portion. It has 16.

In this embodiment, a composite sheet 17 is used for the ventral side portion 11 and the dorsal side portion 12. On the other hand, the crotch portion 13 may be composed of the same composite sheet 17 as the ventral side portion 11 and the dorsal side portion 12, or may be composed of the same non-woven fabric as the conventional one. For example, a non-woven fabric is used for the inseam 13 from the viewpoint of making the material thickness as thin as possible in order to reduce the sluggishness when worn due to the material thickness of the inseam portion. The type of the non-woven fabric is not particularly limited, and examples thereof include non-woven fabrics such as thermal bonded non-woven fabric, air-through non-woven fabric, and spun-bonded non-woven fabric. It is preferable to include as. From the viewpoint of obtaining the crotch portion 13 having a predetermined ventilation resistance value and strength, the basis weight of the non-woven fabric of the crotch portion 13 is, for example, in ^{the range of 15 g / m 2} or more and 40 g / m ² or less or 18 g / m ² or more and 40 g. The range is / m ^{2 or less.}

<Composite sheet>
When the composite sheet 17 is used for the ventral side portion 11 and the dorsal side portion 12, as shown in FIG. 1, the amount of gathers and wrinkles on the surface can be significantly reduced as compared with the gathers 110 and 111 of FIG. Therefore, the possibility that the wear of the pants-type absorbent article 1 will be recognized by others is greatly reduced as compared with the conventional pants-type absorbent article 100 of FIG. Further, since the composite sheet 17 arranged on the ventral side portion 11 and the dorsal side portion 12 has good breathability, the pants-type absorbent article 1 itself has excellent breathability and can be worn for a long time. It is very difficult for stuffiness to occur, and a good wearing feeling can be obtained.

The composite sheet 17 of the present embodiment includes two cotton-containing composite non-woven fabrics 14 (hereinafter, also simply referred to as “composite-type non-woven fabric 14”), an elastic film 15 interposed between the two composite non-woven fabrics 14, and an elastic film 15. It is provided with a plurality of adhesive portions 30 that are interposed between the composite nonwoven fabric 14 and the elastic film 15 and are separated from each other in the plane direction to integrate the composite nonwoven fabric 14 and the elastic film 15. The composite sheet 17 of the present embodiment includes, but is not limited to, two composite non-woven fabrics 14, three or more composite nonwoven fabrics 14, and two or more elastic films 15 arranged between them. And may be included. Further, the composite non-woven fabric 14 is, for example, a polypropylene spunbonded non-woven fabric as disclosed in US Pat. No. 5,284,703, in which cotton fibers are entangled with water to form a sheet.

(Cotton-containing composite non-woven fabric)
The cotton-containing composite non-woven fabric 14 of the present embodiment mainly contains a cotton fiber layer and a non-woven fabric as its constituent materials. The cotton fiber layer has too high wettability to a liquid and too low strength, and is difficult to use alone as a constituent member of the absorbent article 1. On the other hand, according to the present embodiment, the cotton fiber layer is excessively easily wetted by laminating or integrally reinforcing the ultra-thin cotton fiber layer that cannot be used as a constituent member of the absorbent article 1 with the non-woven fabric. It is possible to alleviate the problem and to exhibit a practically sufficient level of liquid absorption and diffusivity. In addition, the cotton fiber layer has excellent texture and softness, improving the wearing feeling. Therefore, the pants-type absorbent article 1 of the present embodiment using the cotton-containing composite nonwoven fabric 14 has the liquid absorbency, the absorption rate, and the liquid diffusibility in the absorber 23, which are required for the pants-type absorbent article. In addition to having various characteristics such as texture and wearing feeling at a high level, it also has the advantage of being less likely to cause skin problems.

The cotton-containing composite non-woven fabric 14 includes a non-woven fabric and a cotton fiber layer laminated on at least one surface of the non-woven fabric. The cotton-containing composite nonwoven fabric of the preferred embodiment includes a nonwoven fabric and a cotton fiber layer integrated on at least one surface of the nonwoven fabric. Here, "integration" means that at least before and after the use of the absorbent article 1, the non-woven fabric and the cotton fiber layer are partially peeled off and their functions are not significantly reduced. The basis weight of the non-woven fabric is, for example, 7 g / m ² or more and 30 g / m ² or less, and the basis weight of the cotton fiber layer is, for example, 30 g / m ² or more and 50 g / m ² or less. By setting each basis weight of the nonwoven fabric and the cotton fiber layer within the above range, it becomes easy to adjust the basis weight of the cotton-containing composite nonwoven fabric 14 to an appropriate range described later.

Among the cotton-containing composite non-woven fabric 14, an integrated product by water flow confounding is preferable. The integrated product is, for example, a cotton-containing composite non-woven fabric 14 in which wood pulp fibers are entangled with a water jet on the surface of the non-woven fabric without using a binder, and the non-woven fabric is integrated to provide a cotton fiber layer. In such a cotton-containing composite non-woven fabric 14, the fibers constituting the non-woven fabric and the cotton fibers are entangled on one surface of the non-woven fabric to integrate the cotton fiber layer, and a part of the cotton fibers makes the non-woven fabric thicker. It penetrates and is exposed on the other surface, and the non-woven fabric and the cotton fiber layer are extremely strongly bonded.

The weight ratio between the non-woven fabric and the cotton fiber layer (nonwoven fabric / cotton fiber layer) is, for example, in the range of 40/60% by weight or more and 10/90% by weight or less. When the content of the cotton fiber layer is less than 40% by mass, the cotton-containing composite non-woven fabric 14 tends to be poor in texture and absorption of sweat and tends to get stuffy, and when it exceeds 60% by mass, the cotton-containing composite non-woven fabric 14 tends to be stuffy. Tends to be stiff. The non-woven fabric integrated with the cotton fiber layer is not particularly limited, but a spunbonded non-woven fabric is preferable from the viewpoint of supportability to the cotton fiber layer, strength and softness of the entire composite non-woven fabric 14, texture, and the like, and polypropylene is preferable. A spunbonded non-woven fabric containing fibers is more preferable, and a spunbonded non-woven fabric made of polypropylene fibers is further preferable.

The basis weight of the cotton-containing composite nonwoven fabric 14, from the viewpoint of strength and texture, for example 40 g / ^{m 2} or more 60 g / ^{m 2} or less or in the range of 40 g / ^{m 2} or more 50 g / ^{m 2} or less. At less than 40 g / m ² , the cotton-containing composite non-woven fabric 14 becomes softer, but it is not fixed stably during manufacturing, and the manufacturing yield tends to decrease. At 60 g / m ² or more, the cotton-containing composite non-woven fabric 14 tends to be softer. By increasing the hardness and thickness, higher energy is required for integration with the stretchable film 15, and there is a growing concern that the load on the manufacturing equipment will increase.

(Elastic film)
The elastic film 15 is included in the composite sheet 17 in a state of being expanded and contracted in the expansion and contraction direction (a state in which the elongation rate in the expansion and contraction direction is within a predetermined range). The stretchable film 15 is not particularly limited as long as it has elasticity, but a film made of a synthetic resin that exhibits elasticity by forming a film is preferable. Examples of the synthetic resin include polyester-based elastomers, polyolefin-based elastomers, thermoplastic polyurethane-based resins, polyamide-based resins, and two or more alloys thereof. Among these, a film containing a polyurethane-based resin is preferable, and a film made of a polyurethane-based resin is more preferable, from the viewpoint of cost and stretchability. From the viewpoint of obtaining the composite sheet 17 having a predetermined airflow resistance value and the elongation rate in the expansion / contraction direction, the thickness of the elastic film 15 is, for example, in the range of 20 μm or more and 60 μm or less, and the elongation rate in the expansion / contraction direction of the elastic film 15 is, for example. It is in the range of 150% or more and 270% or less.

(Adhesive part)
The adhesive portion 30 is a portion where the composite non-woven fabric 14 and the elastic film 15 are adhered and integrated. In the present specification, the integration of the composite non-woven fabric 14 and the stretchable film 15 means that the composite non-woven fabric 14 and the stretchable film 15 are adhered to each other, and at least until the end of use of the pants-type absorbent article 1. Means that is maintained. The adhesive portion 30 has a predetermined planar shape, which will be described later. Further, it is preferable to use a method such as heat fusion or ultrasonic bonding for integrating the cotton-containing composite non-woven fabric 14 and the elastic film 15. By using these integration methods, the adhesive portion 30 having a predetermined planar shape can be easily formed. The integration method will also be described later.

FIG. 4 is a schematic plan view showing an enlarged example of the planar shape and arrangement pattern of the adhesive portion 30 on the surface of the composite sheet 17. As shown in FIG. 4, the composite sheet 17 is integrated by a plurality of adhesive portions 30 having a planar shape in which a quadrangle and a circle are combined in a plan view. The adhesive portion 30 has a planar shape in which a corner portion derived from a quadrangle and a partial arc line derived from a circle are connected, and preferably a plurality of the corner portions derived from the quadrangle and a plurality of the corner portions derived from the circle. It has a planar shape in which the partial arc line of the above is connected.

More specifically, the adhesive portion 30 of the present embodiment has a shape in which a rectangle 40 extending orthogonal to the expansion / contraction direction Y of the composite sheet 17 and a circle 41 are integrated, and is a diagonal line of the rectangle 40. The intersection and the center of the circle 41 coincide (overlap), and the diameter of the circle 41 is longer than the short side of the rectangle 40 and shorter than the long side. The adhesive portion 30 of the present embodiment has four corners derived from the rectangle 40 and two partial arc lines derived from the circle 41, one of which is in the expansion / contraction direction Y and the other. Protrude in other directions in the expansion and contraction direction. In the bonded portion 30 of the present embodiment, the rectangular 40 portion extends in a direction substantially orthogonal to the expansion / contraction direction Y, but the present invention is not limited to this, and the extending direction of the rectangular 40 portion with respect to the orthogonal direction is, for example, 30. It may be tilted at any angle such as °, 45 °, 60 °, 90 °. Hereinafter, the inclination of the rectangular 40 portion with respect to the expansion / contraction direction is also simply referred to as "inclination Z" (Table 1). Such adhesive portions 30 are arranged in a pattern X and / or a pattern Y along the expansion / contraction direction Y of the composite sheet 17. A predetermined phase difference may be provided for each column in the pattern X or Y. Further, the adhesive portion 30 may be arranged in a grid arrangement, a grid arrangement, or the like.

Since the composite sheet 17 integrated with the plurality of adhesive portions 30 having such a planar shape has appropriate mechanical strength, elasticity, and tightening property, gathers can be formed by arranging the elastic elastic members. It is not necessary, and it is very suitable as an exterior body of the pants-type absorbent article 1 because it improves the low air permeability, which is a drawback of the conventional composite sheet.

In FIG. 4, a preferable example of each dimension of the adhesive portion 30 is shown. The dimension (length in the expansion / contraction direction) of the rectangular 40 portion of the adhesion portion 30 represented by the reference numeral “A” is extended by 250% in the expansion / contraction direction Y. Sometimes, the dimension is, for example, in the range of 0.2 mm or more and 0.4 mm or less, and the dimension in the direction substantially orthogonal to the expansion / contraction direction Y of the bonding portion 30, which is indicated by the reference numeral “B”, is, for example, 0.8 mm or more. The diameter of the circular portion 41 of the bonding portion 30, which is in the range of 0 mm or less and is indicated by the reference numeral “C”, is, for example, in the range of 0.3 mm or more and 0.8 mm or less and is indicated by the reference _{numeral “D 1”.} The shortest length of the adhesive portion 30 adjacent to the expansion / contraction direction Y is, for example, in the range of 1.0 mm or more and 3.0 mm or less when the composite sheet 17 is extended by 250% in the expansion / contraction direction Y, and has the reference numeral "D _2". The shortest length of the bonding portions 30 adjacent to each other in the direction substantially orthogonal to the expansion / contraction direction Y, which is indicated by The shortest length of the adhesive portion 30 adjacent to the expansion / contraction direction Y in the above is, for example, in the range of 2.0 mm or more and 5.0 mm or less when the composite sheet 17 is extended by 250% in the expansion / contraction direction Y. By setting the adhesive portion 30 in the above range, the air permeability of the composite sheet 17 is further improved, and the decrease in the durability of the stretchable film 15 is alleviated.

In the composite sheet 17, the adhesive area ratio of the adhesive portion 30 is, for example, in the range of 4% or more and 18% or less. Here, the adhesive area ratio indicates the ratio of the total area of the adhesive portions 30 existing in the unit area to the unit area of the composite sheet 17 as a percentage. If the adhesive area ratio is less than 4%, the air permeability of the composite sheet 17 tends to decrease. On the other hand, when the adhesive area ratio exceeds 18%, the strength of the composite sheet 17 tends to decrease.

(Stretching characteristics of composite sheet, etc.)
As described above, the composite sheet 17 of the present embodiment is an integrated product of the laminated body 30 of the two cotton-containing composite non-woven fabrics 14 and the one elastic film 15, and the cross-sectional view is unidirectional. The composite sheet 17 may be a composite sheet 17 having a three-dimensional shape having a flat surface and a layered shape extending in a straight line, and having a three-dimensional shape having a wavy line having a cross-sectional view extending in one direction and having regular irregularities on the surface. The composite sheet 17 may be used. From the viewpoint of texture, touch, cushioning, etc., the latter composite sheet 17 having a wavy line shape in which the cross-sectional view extends in one direction is preferable.

The ventilation resistance value of the composite sheet 17 measured after being stretched 250% in the expansion / contraction direction is, for example, in the range of 0.01 kPa · s / m or more and 0.5 kPa · s / m or less or 0.05 kPa · s / m or more. The range is 0.35 kPa · s / m or less. Since the composite sheet 17 has a ventilation resistance value in the above range, even if the composite sheet 17 is used for the inseam 13 and the absorbent body 20 is fixed to the skin side surface of the inseam 13, the ventral side 11 and the dorsal side Good air permeability is maintained by the composite sheet 17 constituting the portion 12. If the aeration resistance value is less than 0.01 kPa · s / m, the heat retention property of the pants-type absorbent article 1 tends to decrease, and the wearing feeling tends to decrease. If the aeration resistance value exceeds 0.5 kPa · s / m, the aeration of the pants-type absorbent article 1 is lowered, and there is a tendency for stuffiness to occur when worn.

The composite sheet 17 has an elongation rate in the expansion / contraction direction, for example, in the range of 150% or more and 270% or less, or in the range of 180% or more and 250% or less. Here, the elongation rate in the expansion / contraction direction is the tensile stress (tensile stress) measured when stretching in the elastic region by a tensile test in which the initial chuck interval (distance between marked lines) is 150 mm and the tensile speed is 300 mm / min. N / 50 mm) is the ratio of the length of the stretched and increased portion to the natural length in the non-stretchable state when loaded. The elongation rate can be measured using, for example, an autograph manufactured by Shimadzu Corporation. Since the elongation rate of the composite sheet 17 in the expansion and contraction direction is within the above range, it is easy for the wearer to put on and take off, it is comfortable to wear with appropriate tightening, and it is a pants type that does not easily slip off and gives a sense of security. Absorbent article 1 is obtained.

2. When the composite sheet 17 has an extension load of 0.8 N / 50 mm or more and 2.0 N / 50 mm or less when extended 120% in the expansion / contraction direction and is extended 150% in the expansion / contraction direction, for example. It has an extension load of 0N / 50mm or more and 3.5N / 50mm or less. Since the elongation rate changes depending on the body shape of the wearer, an extension load of 120% and 150% is specified. By doing so, there is no difference in fit depending on the body shape. Further, the composite sheet 17 has, for example, an elongation rate of 200% or more and 270% or less in the expansion and contraction direction. For this reason, since it is possible to stretch 200% or more as compared with the conventional case, it is possible to provide the pants-type absorbent article 1 which is easy for the wearer to put on and take off.

Further, the composite sheet 17 has, for example, a breaking elongation in the range of 210% or more and 280% or less in the expansion / contraction direction. The breaking elongation is defined as the breaking elongation = where the length of the composite sheet 17 which is in the natural length in the non-stretchable state is L1 and the length when the composite sheet 17 is stretched in the stretching direction and broken is L2. (L2 / L1) × 100 (%). By having the breaking elongation in this range, there is an effect that the pants are less likely to be stretched or torn even if the pants are widely spread when putting on and taking off. The elongation at break can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

<Manufacturing method of composite sheet>
The composite sheet 17 can be produced, for example, by the production method shown in FIG. FIG. 5 is a drawing schematically showing a manufacturing method of the composite sheet 17. FIG. 5A is a schematic side view showing all the steps of the method for manufacturing the composite sheet 17. FIG. 5B is a schematic cross-sectional view showing an enlarged third step (adhesion step). The manufacturing method shown in FIG. 5 is a method using ultrasonic bonding, heat fusion, or the like, and includes the first to third steps in this order.

In the first step, the stretchable film 15 wound around the feed roller 51 is conveyed while being loaded with a predetermined tension. The stretchable film 15 is conveyed while being stretched in the conveying direction by a predetermined tension. The predetermined tension is a tension that stretches the stretchable film 15 in a range of, for example, 200% or more or 250 ± 30%.

In the second step following the first step, each non-woven fabric 14 wound around the two feeding rollers 52 is laminated on the upper and lower sides of the stretchable film 15 conveyed in the stretched state to obtain a laminated body before integration.
In the third step following the second step, the laminated body before integration is passed through the pressure-welding portions (hereinafter, also referred to as “nip portions”) of the first and second joining rollers 53 and 54, and the predetermined bonding portion 30 is formed. They are integrated so as to be formed to obtain a composite sheet 17. The first joining roller 53 is provided with a plurality of recesses 55 extending in the width direction and having a predetermined size and a predetermined internal space shape on the peripheral surface thereof at predetermined intervals in the circumferential direction. The second joining roller 54 has a convex portion on its peripheral surface that extends in the width direction and has a predetermined dimension and a predetermined three-dimensional shape (a three-dimensional shape in which the tip portion can be inserted into the recess 55 under the intervention of the laminated body). A plurality of 56s are provided at predetermined intervals in the circumferential direction. The first and second joining rollers 53 and 54 are meshed with each other so that the tip portion of the convex portion 56 can be inserted into the concave portion 55, and are pressure-welded with a predetermined pressure. Seal lines substantially continuous in the width direction of the roller peripheral surface are formed in the nip portions of the first and second joining rollers 53 and 54 at intervals of, for example, 0.5 mm or more and 2.0 mm or less in the expansion and contraction direction. ing. One or both of the first and second joining rollers 53 and 54 are provided with an ultrasonic generator or a heating device, and can apply ultrasonic waves to at least the tip portion of the inner wall surface of the concave portion 55 or the convex portion 56. Alternatively, it is configured to be heatable.

In the third step, the laminate obtained in the second step is passed through the nip portions of the first and second joining rollers 53 and 54 under pressure to form an inner wall surface of the concave portion 55 and a tip portion of the convex portion 56. By ultrasonically applying or heating the seal wire, which is the contact point of the non-woven fabric 14, a plurality of adhesive portions 30 having a predetermined planar shape are formed, and the non-woven fabric 14 and the elastic film 15 are integrated by the plurality of adhesive portions 30. A composite sheet 17 having less surface wrinkles and a smooth feel can be obtained. That is, a plurality of adhesive portions 30 having a planar shape shown in FIG. 4 are formed at predetermined intervals shown in FIG. A composite sheet 17 in which the non-woven fabric 14 and the elastic film 15 are integrated is obtained.

<Leg gather>
As shown in FIGS. 2 and 3, the leg gather 16 includes an elastic elastic member 16a and a leg gather sheet 16b. The elastic elastic member 16a is not particularly limited, and for example, thread rubber or the like can be used. As the leg gather sheet 16b, for example, various non-woven fabrics and the like can be used. By providing the leg gathers 16, it is possible to expand and contract not only in the expansion and contraction direction (width direction) but also in the direction intersecting the expansion and contraction direction (longitudinal direction), and the fit feeling in the portion around the inseam is improved. The shape of the leg gather 16 is unlikely to appear on the surface of the clothes when the pants-type absorbent article 1 is worn and worn. The pants-type absorbent article 1 of the present embodiment also includes an embodiment that does not include the leg gather 16.

<Manufacturing method of pants-type absorbent articles>
The pants-type absorbent article 1 is a conventional pants-type absorbent article except that the composite sheet 17 is used as the exterior body 10 of the ventral portion 11, the dorsal portion 12, or the ventral side portion 11, the dorsal portion 12, and the inseam 13. It can be produced in the same manner as a sex article. For example, the ventral side portion 11 and the dorsal side portion 12 are manufactured from the composite sheet 17, the crotch portion 13 is composed of a conventional non-woven laminate or the composite sheet 17, and these are joined in a predetermined order in the longitudinal direction to form an exterior. The step of obtaining the body 10, the step of fixing the absorbent body 20 to a predetermined position (mainly the inseam 13) on the skin side surface of the exterior body 10, and the vicinity of both ends of the absorbent body 20 on the skin side surface of the exterior body 10 in the width direction. The pants-type absorbent article 1 can be obtained by a manufacturing method including a step of joining the leg gathers 16 to the legs. When the ventral side portion 11, the dorsal side portion 12, and the crotch portion 13 are composed of the composite sheet 17, the composite sheet 17 is die-cut into a predetermined shape (for example, the shape of the developed plan view shown in FIG. 2). It may be used as the exterior body 10. The pants-type absorbent article 1 thus obtained is commercialized by folding it in a predetermined order and packing it in a bag.

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 described in the above-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. 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 1 to 3 and Comparative Examples 1 to 4>

(Creation of exterior body)
The exterior bodies of the ventral, dorsal, and crotch parts have the planar shape and arrangement shown in FIG. 4 (arrangements X and Y are arranged alternately in the direction perpendicular to the row), and are front-facing. By each of the adhesive portions of Examples 1 to 3 having each dimension shown in 1 (each dimension of A, B, C, D ₁ , D _{2 and E shown in FIG. 4) and formed by ultrasonic bonding, 2} A polyurethane film (thickness 20 μm, expansion / contraction rate 250% in the expansion / contraction direction) is arranged between the cotton-containing composite non-woven fabrics (basis weights 40, 50, 60 g / m ^{2 in the order of Examples 1, 2 and 3).} , An integrated composite sheet was used. In Comparative Examples 1 to 3, examples except that polypropylene spunbonded non-woven fabric (basis weight 18, 25, 40 g / m ^{2 in} the order of Comparative Examples 1, 2 and 3) was used instead of the cotton-containing composite non-woven fabric. A composite sheet was prepared in the same manner as in 1-3. In Comparative Example 4, a composite sheet was produced in the same manner as in Examples 1 to 3 except that a pulp-containing composite non-woven fabric (trade name: hydroknit non-woven fabric, manufactured by Kimberly-Clark, USA) was used instead of the cotton-containing composite non-woven fabric. bottom.

In addition, an air-through non-woven fabric with a basis weight of 30 g / m ² is used as the top sheet, and a breathable polyethylene film with a basis weight of 28 g / m ^{2 is used as the back sheet.} An absorbent body made of a mixture of 11 g of a highly water-absorbent polymer made of resin was arranged to prepare an absorbent main body, and the outer body was bonded mainly to the skin side surface of the lower crotch with a hot melt adhesive. In addition, two undercarriage of 940 decitex urethane thread rubber extending in the longitudinal direction are arranged on the skin side surface of the exterior body at both ends in the width direction of the absorbent body in a state of being stretched to 200%. Gathers were joined to produce a pants-type absorbent article.

The following evaluation tests and sensory evaluations were carried out on each of the pants-type absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3. The results are shown in Table 1.

<Evaluation of elongation rate in the expansion and contraction direction>
The elongation rate in the expansion and contraction direction is measured when extending within the elastic region in a tensile test using an autograph manufactured by Shimadzu Corporation, where the initial chuck interval (distance between marked lines) is 150 mm and the tensile speed is 300 mm / min. When the tensile stress (N / 50 mm) was applied, the length of the stretched and increased length was calculated as the ratio to the natural length in the non-stretched state.

<Breathability evaluation>
The measurement test piece obtained by cutting out the ventral side from each of the pants-type absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3 was once stretched 250% in the stretching direction, and then the stretching was released to perform a breathability test. The ventilation resistance value R (kPa · s / m) was measured using a machine (trade name: KES-F8, manufactured by Kato Tech Co., Ltd.).

<Sensory evaluation>
A sensory test was conducted on the elasticity, fit, stuffiness around the abdomen, and the feel of the exterior body of the absorbent article. Twenty monitors were asked to wear the pants-type absorbent articles of Examples 1 to 3 and Comparative Examples 1 to 3, and the elasticity (whether or not it was easy to wear), the fit, and the stuffiness around the abdomen, A sensory evaluation was performed on the feel of the exterior body (whether or not it has a softness and texture close to that of cloth). Regarding the sensory evaluation, both evaluations were conducted by selecting "good" and "bad", and evaluated according to the following criteria.
◎: When “good” is 17 or more and 20 or less 〇: When “good” is 12 or more and 16 or less △: When “good” is 5 or more and 11 or less ×: Is there “good”? When 1 or more and 4 or less

From Table 1, Examples 1 to 3 in which the cotton-containing composite non-woven fabric was used as the non-woven fabric for the exterior body were superior to Comparative Examples 1 to 3 in touch. In particular, Example 1 was superior to Comparative Examples 1 to 3 in terms of stuffiness.

1 Pants-type absorbent article 10 Exterior body 11 Ventral side 12 Dorsal side 13 Inseam 14 Cotton-containing composite non-woven fabric 15 Elastic film 16 Leg gather 17 Composite sheet 20 Absorbent body 21 Top sheet 22 Back sheet 23 Absorbent 24 Three-dimensional gather 30 Adhesive part

Claims (5)

An absorbent body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet, and a ventral portion supporting the absorbent body. A pants-type absorbent article comprising an exterior body divided into an inseam and a dorsal part.
The ventral portion and the dorsal portion each include a composite sheet and contain a composite sheet.
The composite sheet is
Multiple cotton-containing composite non-woven fabrics and
An elastic film arranged between the cotton-containing composite non-woven fabrics and
Includes a plurality of adhesive portions that integrate the cotton-containing composite nonwoven fabric and the stretchable film so as to be separated from each other in the plane direction.
The cotton-containing composite non-woven fabric is
Non-woven fabric and
A pants-type absorbent article comprising a cotton fiber layer laminated on at least one surface of the nonwoven fabric. In the exterior body, the basis weight per sheet of the cotton-containing composite nonwoven fabric is 40 g / m ² or more and 60 g / m ² or less, the nonwoven fabric is a spunbonded nonwoven fabric, and the spunbonded nonwoven fabric and the cotton fiber layer. The pants-type absorbent article according to claim 1, wherein the weight composition ratio of the non-woven fabric is 40/60% by weight or more and 10/90% by weight or less. The pants-type absorbent article according to claim 1 or 2, wherein the composite sheet is an integrated product including the bonded portion by heat fusion and / or ultrasonic bonding. The pants-type absorbent article according to any one of claims 1 to 3, wherein the composite sheet has an elongation rate of 150% or more and 270% or less in the expansion and contraction direction. The pants-type absorbent article according to any one of claims 1 to 4, further comprising an elastic elastic member disposed from the ventral side to the crotch portion and extending to the dorsal side.

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