JP3331075B2 - Absorbent articles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article using a composite material as an elastic member, and more particularly to an absorbent article which does not have elasticity in a normal state, but to which energy such as heating and UV irradiation is applied. The present invention relates to an absorbent article using a composite material that exhibits elasticity and can be used as an elastic member.

[0002]

2. Description of the Related Art Conventionally, elastic bodies have been used for imparting elasticity to various products. Conventionally, such elastic bodies have been incorporated into products in an extended state. Therefore, various problems have occurred.

[0003] For example, an absorbent article such as a disposable diaper is also usually constructed by incorporating an elastic body. When the elastic body is incorporated into an absorbent article, it is required to be in an extended state on a production line. In many cases, the elastic body is incorporated in an extended state, but the extension ratio varies. Therefore, in the absorbent article, there is a problem that the physical properties of the elastic portion are not constant, and the stability of the product is poor. In addition, when the elastic body is incorporated into the absorbent article as described above, the equipment becomes complicated in the manufacturing process, and further, the elastic body must be incorporated into the absorbent article in a state where the elastic body is extended on the production line. Therefore, there is a problem that the production speed is inferior.

[0004] In order to solve the above-mentioned problem, various proposals have hitherto been made, for example, Japanese Patent Publication No. 4-64701.
JP-A-59-144601, JP-A-59-144601,
-17101, JP-A-60-250935, JP-A-63-112714, JP-T-64-5
A technique disclosed in Japanese Patent Application Publication No. 00361 or the like is known.

However, the above-mentioned Japanese Patent Publication No. 4-6470.
The technology disclosed in Japanese Patent Publication No. 1 is to stretch a stretchable material at a high temperature on a line and then cool it at room temperature and incorporate it into a product. Is not suitable.

The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-144601 is to provide a disposable diaper having a waist band made of an elastically contractible elastic material. At the time of assembling the product, the elastic material is stretched by the tension at the time of processing, so that there is a problem similar to the technique disclosed in Japanese Patent Publication No. 4-64701.

The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Sho 60-17101 is to stretch and fix the elastic body only to an EVA rubber elastomer containing EP rubber.

The technique disclosed in Japanese Patent Application Laid-Open No. 60-250935 uses an elastomer composed of a block copolymer in which polyamide and polyether are alternately repeated as an elastic body.

Further, the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-112714 is to bond and fix a strong reinforcing member and mechanically process it to form an elastic shearing. Usually, if the strength of the reinforcing member is too large, the physical properties of the reinforcing member after contraction are reduced. Specifically, for example, there are problems such as an increase in permanent strain and an increase in hysteresis. Further, when mechanically fixing to a support, there is a problem in that the material is stretched during fixing and it is necessary to perform an operation of fixing to a belt, so that high-speed productivity is poor.

The technique disclosed in Japanese Patent Application Laid-Open No. 64-500361 uses an elastomer which is inelastic when not shrunk and elastic when shrunk, and is thermally shrunk after being incorporated in a diaper. Although an elastic region is provided, there is no description of a specific material composition or a description of physical properties of these materials.

That is, the techniques proposed in the prior art do not solve the problem of elongation at the time of processing an elastic material and incorporating a process in manufacturing an absorbent article, and the problem of not being able to cope with high-speed production. The problem caused by having to incorporate such an elastic body in an extended state could not be solved.

Accordingly, an object of the present invention is to eliminate the adverse effects caused by the extension of the elastic body during the processing of various products such as absorbent articles, and to improve the stability of product performance.
Furthermore, using a composite material that can also enable high production of the absorbent article and the like, an absorbent article in which the above-mentioned various problems caused by incorporating an elastic body in an elongated state in a manufacturing process has been solved. To provide.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that an elastic material and an inelastic material can be used by using a curable adhesive that is cured by externally applying energy. The present inventors have found that an absorbent article using a composite material bonded to a body as an elastic member can achieve the above object, and have completed the present invention.

That is, the present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, and an elastic member forming a gather at a desired position. In the absorbent article, the elastic member is fixed via an adhesive layer while maintaining the stretched state of the elastic body on one or both sides of the stretched elastic body. And an inelastic body, wherein the adhesive layer comprises a hot melt adhesive,
Adhesive (A) selected from adhesives and solvent-based adhesives
And a photosensitive curable adhesive or a thermosetting adhesive, which are cured by external energy application and serve as an adhesive.
Upper and loss of function, is formed by disposing curable adhesive you impossible maintain the tension of the elastic body and (B) in a predetermined pattern, the elastic body by the energy added
Kise' Chakuzai is formed by a composite material made so as to be telescopically in non-adhered portion (A), said gathers, after disposing the composite material to the desired location of the absorbent article, It is intended to provide an absorbent article characterized by being formed by adding energy from the outside.

Hereinafter, the composite material used in the absorbent article of the present invention will be described in more detail. Examples of the elastic body used in the composite material include the following. Natural rubber or styrene rubber, olefin rubber,
An elastomer film made of synthetic rubber such as urethane rubber or ester rubber.

Further, as the non-elastic body in the composite material, the following materials may be mentioned. Paper, nonwoven fabric, polyolefin film such as polyethylene or polypropylene.

[0017] As the Kise' Chakuzai (A) on the formation of the adhesive layer in the composite material, Ho Tsu Tomeruto adhesive, et
Shall be selected from Marujon based adhesives and solvent based adhesives.

The curable adhesive (B) forming the adhesive layer is a photosensitive curable adhesive or a thermosetting adhesive.
In the normal state (normal temperature, natural exposure state, etc.), it functions as a normal adhesive, but when energy such as light or heat is applied from the outside, it cures and functions as an adhesive. It lost, but Ru <br/> be impossible maintain the tension of the elastic member.

The above-mentioned photosensitive curable adhesive is preferably one which is cured by irradiation with UV or visible light. The irradiation time of UV or visible light at this time is not particularly limited, but is preferably 0.1 to 2 seconds for production. Specific examples of the photosensitive curable adhesive include the following. An acrylic or vinyl monomer usually used as an adhesive to which various polymers, curing accelerators, photosensitizers, and the like are added.

The thermosetting adhesive is not particularly limited, but the temperature and the time are not particularly limited. For the production, the adhesive is preferably cured at a temperature of 80 to 150 ° C. for a curing time of 0.1 to 10 seconds. Is preferred.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the absorbent article of the present invention will be described in more detail with reference to the drawings, and the present invention will be described more specifically with reference to examples. First, an example of a composite material used for the absorbent article of the present invention will be described with reference to FIGS. Here, FIG. 1 is a perspective view schematically showing one example of a composite material used for the absorbent article of the present invention, and FIG.
FIG. 2 is a perspective view schematically showing a state after energy is externally applied to the composite material shown in FIG. 1.

The composite material 1 shown in Figure 1, in the one surface of the elastic body 2 and the elastic body 2 of the extended state, while maintaining the extended state of the elastic body 2, the upper Kise' Chakuzai (A) 11 and The non-elastic body 3 fixed via an adhesive layer 10 formed by disposing the curable adhesive (B) 12 in a predetermined pattern, and the elastic body 3 There has been made so as to be telescopically in non-adhered portion on Kise' Chakuzai (a). And the shape is
It is strip-shaped.

The stretching rate in the above stretched state is arbitrary and can be appropriately selected according to the use of the composite material of the present invention. For example, when the composite material is used for an absorbent article such as a disposable diaper. Is the elongation rate of 100 to 200%
It is preferred that

Further, although the above predetermined pattern is also optional depending on the application of the composite material, specifically, a strip-shaped curable adhesive (B) 12 and the linear adhesives (A) 11 , A curable adhesive in which patterns are alternately arranged in multiple rows
(B) 12 and adhesives (A) 11 Togaumi - Island have a relationship <br/>且one adhesives (A) 11 can be mentioned the pattern or the like to be arranged in a dot shape, the present embodiment In the example, the above pattern is adopted. In addition, the curable adhesive (B) 1
2 and adhesives (A) 11 and the area ratio of 50-90: 50
It is preferably from 10 to 10, more preferably from 70 to 80:30 to 20. Further, the width L of the composite material 1
Is preferably set to 1 to 50 mm, the width N of the curable adhesive (B) 12 may preferably be 1 to 5 mm, the width M of the upper Kise' Chakuzai (A) 11 is 1 Preferably 2 mm

The thickness of the elastic body 2 is 5 to 50 μm.
m, the thickness of the inelastic body is preferably 5 to 30 μm, the thickness of the adhesive layer 10 is preferably 2 to 10 μm, and the thickness of the entire composite material 1 is preferably 20 to 100 μm.

[0026] To produce the composite material, after the extended state extend the elastic body 2, while maintaining the stretched state of the elastic body 2, on one side of the elastic body 2 Kise' Chakuzai (A)
11 and the curable adhesive (B) 12 are applied to form an adhesive layer 10, and the inelastic body 3 is brought into contact with the adhesive layer 10 so that the elastic body 2 and the inelastic body 3 can be manufactured by fixing them.

In the composite material, since the elastic body 2 is fixed to the inelastic body 3 via the adhesive layer 10,
Since the elastic body 2 does not exhibit the elasticity of the elastic body as a whole even in the stretched state, the composite material 1 can be handled in the same manner as a member having no normal elasticity. And when using the above composite material,
After arranging the composite material at desired positions of various products, by applying energy such as light or heat from the outside, FIG.
As shown in, the curable adhesive (B) and allowed to cure to by a loss of its adhesive strength, upper Kise' Chakuzai (A)
(The portion where the elastic body and the non-elastic body are fixed via the curable adhesive (B)) so that the elastic body can be expanded and contracted. An elastic member can be used. Therefore,
When laying the above-mentioned composite material on an absorbent article, there is no problem that occurs when a conventional elastic member is used.

Next, another example of the composite material will be described with reference to FIGS. Here, FIG. 3 is a perspective view schematically showing another example of the composite material used in the absorbent article of the present invention, and FIG. 4 is a diagram after the energy is externally applied to the composite material shown in FIG. 3 is a perspective view schematically showing the state of FIG. Composite material shown in FIG. 3, in both the elastic body and the elastic body of the stretched state, while maintaining the extended state of the elastic body, the upper Kise' Chakuzai (A) and the curable adhesive
(B) and a non-elastic body fixed via an adhesive layer formed by arranging them in a predetermined pattern. That is, the composite material of this embodiment is the same as that of the first embodiment except that the inelastic body is fixed to both surfaces of the upper elastic body.

Next, a disposable diaper as an absorbent article of the present invention will be described with reference to FIG. The disposable diaper 21 of the present invention shown in FIG. 5 includes a liquid-permeable top sheet 22, a liquid-impermeable back sheet 23, and an absorber 24 disposed between these two sheets 22, 23. Elastic member 30 forming gathers 31 at positions
Is arranged. The composite material is used as the elastic member 30, and the gathers 31 are formed by arranging the composite material at the desired position on the absorbent article and applying energy from the outside. More specifically, the composite material, when worn on a wearer diaper,
The waist opening 25 is in contact with the waist of the wearer and the leg opening 26 is in contact with the underbody. Since the absorbent article of the present invention uses the above-mentioned composite material as the elastic member, it does not cause various problems caused by incorporating the elastic body in an extended state as in the case of using a conventional elastic body. It is.

[0030]

According to the absorbent article of the present invention, the adverse effects caused by the expansion of the elastic body during the processing of various products such as absorbent articles can be eliminated, and the stability of the product performance can be improved.
Furthermore, since the elastic member is formed by a composite material that can also enable high production of the absorbent article or the like, the above-described various problems associated with incorporating the elastic body in an elongated state in the manufacturing process are reduced. This has been solved and the stability of the product performance has been improved.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing one example of a composite material used for an absorbent article of the present invention.

FIG. 2 is a perspective view schematically showing a state after externally applying energy to the composite material shown in FIG. 1;

FIG. 3 is a perspective view schematically showing another example of the composite material used for the absorbent article of the present invention.

FIG. 4 is a perspective view schematically showing a state after energy is externally applied to the composite material shown in FIG. 3;

FIG. 5 is a perspective view showing a flat type disposable diaper as the absorbent article of the present invention.

[Explanation of symbols]

1 composite 2 the elastic body 3 inelastic 10 adhesive layer 11 contacting adhesive (A) 12-curable adhesive (B)

Continuation of the front page (56) References JP-A-59-59901 (JP, A) JP-A-2-4365 (JP, A) JP-A-5-222601 (JP, A) JP-A-4-15052 (JP) JP-A-61-275402 (JP, A) JP-A-5-254961 (JP, A) JP-A-5-96003 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB A61F 13/15-13/84 A61F 5/44

Claims (1)

(57) [Claims] 1. A liquid-permeable topsheet, a liquid-impermeable topsheet
Back sheet and absorber placed between these two sheets
Elastic part provided with and forming gathers at desired positions
In the absorbent article provided with the material, the elastic member includes an elastic body in an extended state, and one surface of the elastic body.
Or, on both sides, the stretched state of the elastic body is maintained.
Further, it does not include an inelastic body fixed through an adhesive layer.
And the adhesive layer isHot melt adhesive, emulsion
Selected from adhesives and solvent-based adhesivesadhesive(A)
When,A photosensitive curable adhesive or a thermosetting adhesive,Outside
Cured by applying energy from the partAs an adhesive
Loss of function,It is impossible to maintain the stretched state of the elastic bodyYouTo
Curable adhesive(B)And are arranged in a predetermined pattern.
The elastic body is raised by the energy addition.
WritingDressing(A)Can be expanded and contracted except at the adhesive part
Wherein the gathers form the composite material as described above in an absorbent article.
After being placed at the position of
An absorbent article characterized by the following.