JP2535785Y2 - Surface material - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to the surface material of an absorbent material such as disposable diapers, sanitary napkins, pads, towels, bandages, and has a good texture, good skin contact, sweat and urine,
The present invention relates to a surface material that does not leak to the outside even if it absorbs menstrual blood and has air permeability.

[0002]

2. Description of the Related Art Conventionally, as a surface material for absorbent articles such as disposable diapers, sanitary napkins, bandages and the like, there has been known a material formed of a water-impermeable material, for example, a polyethylene film, in which micropores are formed. (57-1)
No. 7081).

However, since the above-mentioned surface material is characterized in that the water-impermeable material is formed of a plastic film such as a polyethylene film, it is difficult to absorb sweat when touching the skin, and it is not sticky or used for a long time. The disadvantage is that the skin is often rash.

[0004] Since the water-impermeable material is used as the surface material, the surface material itself has no absorbing ability. If there is a water-absorbing substance under the surface material, urine and menstrual blood are absorbed by the water-absorbing substance. However, because of its small absorption capacity and poor skin contact, it is far inferior to textile-type surface materials.

For example, in the summer, especially when a baby wearing a diaper with a plastic film or sheet as a backing material is held, the arms and hands become sticky. When a plastic film is used as a surface material of a sanitary napkin, the contact between the plastic film and the skin is often prone to rash over a long period of time, especially under high temperature and high humidity conditions. To do. In winter, plastic film makes the skin feel cold. There was such a problem.

[0006]

In view of the above, the present inventors have conducted intensive studies to obtain a surface material using a water-permeable material instead of a water-impermeable material. ,
It was found that if a foam or a material containing these as a main component was used as a raw material, the disadvantages of the conventional product could be significantly improved not only in terms of water permeability but also in terms of skin contact, and the present invention was reached. .

That is, this invention has an air permeability of 5 cc / cm ^2.
/ Sec or more, and a large number of micropores containing these as a main component and having a size of 0.0001 to 100 mm ² and gradually narrowing in the thickness direction. Surface material, air permeability is 5-100cc / cm
² / sec, using a nonwoven fabric made of fibers of 2 denier or less, and forming a large number of micropores having a size of 0.0001 to 50 mm ² and gradually narrowing in the thickness direction. It is intended to provide a surface material to be used.

[0008]

The nonwoven fabric used in the present invention may be manufactured by any method, but the spunbonded one has a strong bonding between the fibers, so that there is little fraying of the fibers on the surface. The resin is blown off from a multi-hole nozzle by a high-temperature and high-speed gas, and the fiber is formed and collected on the screen at the same time. The so-called melt blown method is used. preferable.

The resin material of the non-woven fabric may be any of polypropylene, polyethylene, polyester, polyamide, and a material made of polyethylene and polyester or of a structural type (for example, manufactured by Unitika Ltd., trade name: Elves). It may be selected and used according to the purpose of use.

[0010] Further, if necessary, a calendering treatment may be performed, or a film may be laminated so as to obtain characteristics according to the intended use such as improvement in the strength of the surface material.

On the other hand, a part of the surface layer can be made into a skin layer or a film by partially heat-treating by calendering. Further, these processes may be performed on the entire surface.

Examples of the foam include a polyolefin-based or polyurethane-based resin foam, and a polyurethane-based resin foam is preferable in terms of air permeability. The thickness may be arbitrarily set as needed.

In order to form micropores in the above nonwoven fabric or foam, the nonwoven fabric or foam is thermally bonded to a roll having a concave material having the same size as the micropores, and the roll is suctioned. It can be formed using a perforated roll having a surface.

FIG. 1 is a perspective view showing an example of a surface material 1 according to the present invention, and shows a structure in which a number of fine holes 3 are formed in a nonwoven fabric 2.

FIG. 2 is a development view of a disposable paper diaper 5 to which an absorber 4 using the surface material 1 of the present invention is attached, and FIG. 3 is FIG.
FIG. 4 is a perspective view of a napkin 6 using the surface material 1 according to the present invention, similarly showing an inner surface of the back surface side fine holes of the absorber 4.

The configuration example of the surface material 1 shown in FIG. 1 of the present invention is as shown in FIGS. 5 (a) to 5 (f), wherein (a) is composed of only the nonwoven fabric 2 and (b). Shows a type in which a plastic film 7 is bonded to one side of the nonwoven fabric 2, and (c) shows a type in which plastic films 7 are bonded to both sides of the nonwoven fabric 2. (D) is a configuration example composed of only the foam 8,
(e) Foam 8 having two layers of nonwoven fabric on one side of foam 8
(F) is a foam obtained by laminating a plastic film 7 layer on one side of the foam 8.

[0017] The present invention is directed to a surface material mainly composed of a nonwoven fabric or a foam as described above.
It is characterized in that a large number of micropores 3 having a size of ² are formed. Due to the formation of these micropores, the physical permeability of liquid utilizing capillary action is improved. Microporous 3 is preferably a magnitude of 0.01~50mm ^2. As shown in FIGS. 6 (a) to 6 (c), the shape of the fine holes 3 is such that the absorber 4 has (a) a stepped shape 9, (b) a combination of the stepped shape 9 and the inclined shape 10, and (c) It is preferably stepped down in the thickness direction, such as one that is previously recessed in the plat shape 11 and formed in the funnel shape 12, and is preferable in terms of liquid absorbency and prevention of leaching of the liquid once absorbed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments.

Example 1 A polypropylene resin was used as a raw material and obtained by a spun bond method.
Drilled fine hole to a nonwoven 30 g / m ² by a heat roll and heat pinholder, 20
A surface material having a large number of fine pores of 0.1 mm ² adjusted to an air permeability of cc / cm ² / sec was obtained.

Example 2 A surface having a pore of 10 mm ^{2, in which} a microporous sheet made of polyethylene and having a thickness of 1000 μm was made using a hot roll and a hot sword mountain to adjust the air permeability to 100 cc / cm ² / sec. Wood was obtained.

Example 3 30 of a sheath made of polyethylene and polyester
20μ on g / m ² non-woven fabric (product name: Elbes, manufactured by Unitika)
Laminate a polyethylene film of m thickness, and then use a sword mountain whose hole size changes stepwise in the thickness direction to 10 mm
Micropores of different sizes of several stages from ² to 0.01 mm ² were made to obtain a surface material adjusted to a permeability of 20 cc / cm ² / sec.

Each of the surface materials obtained in Examples 1 to 3 was replaced with a surface material of a commercially available paper diaper absorber to prepare paper diapers.

Comparative Example 1 Using a 20 μm thick film made of low density polyethylene,
A surface material was obtained in the same manner as in Example 1, and the surface material was replaced with a surface material of a commercially available paper diaper absorber and mounted, thereby producing a paper diaper.

Using the disposable diapers obtained in Examples 1 to 3 and Comparative Example 1 above for 50 infants, the surface material was subjected to a monitor test for skin contact and redness of the skin, and the results shown in Table 1 were obtained. The surface material of this invention gives the infant a gentle feeling. Close to cloth diapers, there is a feeling of closeness. There is sense of quality and is very good. On the other hand, the surface material of the comparative example has a cool touch like a film. If the baby moves during use, it may make a rustling sound. It was recognized that the surface material of this invention was excellent.

[0025]

[Table 1]

Example 4 A non-woven fabric having a permeability of 30 cc / cm ² / sec (basis weight: 22 g / m ² ) composed of 0.03 denier fiber obtained by a melt blown method using a polypropylene resin as a material and having a surface of 0.1 mm ² and a concave roll. , And a surface material having a large number of 0.1 mm ² micropores was obtained by heating and suction. The surface material was replaced with a surface material of a commercially available paper diaper absorber to prepare a paper diaper, which was subjected to a use test. As a result, the same good results as those in Examples 1 to 3 were obtained.

Example 5 A nonwoven fabric having a permeability of 40 cc / cm ² / sec (basis weight 35 g / m ² ) made of polypropylene resin as a material and obtained by a melt blown method and made of 0.1 denier fiber was used in the same manner as in Example 1. 0.1m
A facing with a number of micropores of m ² was made.

The surface material of the commercially available napkin was removed, and the surface material obtained in Example 5 was attached to obtain a sample.

Comparative Example 2 The surface material obtained in Comparative Example 1 was mounted after removing the surface material of a commercially available napkin to obtain a sample.

The napkins obtained in Example 5 and Comparative Example 2 were used by 50 women and subjected to monitor tests such as skin contact of the surface material and skin rash. The results shown in Table 2 were obtained. While most of the surface materials of Example 2 answered that their skin was rash due to plastic allergy, the napkin of Example 5 using the surface material of the present invention was preferable because of a feeling similar to cloth. And improved results as compared with the film.

[0031]

[Table 2]

[0032]

As described above, the surface material of the present invention has an air permeability of 5 cc / cm ² / sec or more and 0.0001 to
Because it is made of nonwoven fabric or foam with many micropores that are gradually narrowed in the thickness direction of 100 mm ² , it has a liquid absorbing property and a function to prevent leaching of liquid once absorbed. It is excellent as it is, and has no cold plastic feeling like conventional surface materials at all, it has good skin contact, no redness or rash, and it is practically used as a surface material for disposable absorbent articles such as napkins as well as paper diapers. It was found to be excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view of a surface material according to the present invention.

FIG. 2 is a development view of a disposable diaper using the surface material of the present invention.

FIG. 3 is an explanatory view showing micropores on the back surface of the absorber in FIG. 2;

FIG. 4 is a perspective view of a napkin using the surface material of the present invention.

FIGS. 5A to 5F are explanatory views showing examples of the configuration of the surface material of the present invention.

FIGS. 6 (a) to 6 (c) are explanatory views showing an example of a micropore shape in the surface material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface material 2 Nonwoven fabric 3 Micropore 4 Absorber 5 Paper diaper 6 Napkin 7 Plastic film 8 Foam

Claims (4)

(57) [Scope of request for utility model registration] 1. A non-woven fabric or a foam having an air permeability of 5 cc / cm ² / sec or more, or a non-woven fabric or a foam comprising these as a main component, and
A surface material comprising a large number of micropores having a size of 001 to 100 mm ² and gradually narrowing in a thickness direction. 2. A degree of penetration of 5 to 100 cc / cm ² / sec.
And a non-woven fabric composed of fibers of 2 denier or less,
A surface material comprising a large number of micropores having a size of 0001 to 50 mm ² and gradually narrowing in a thickness direction. 3. The surface material according to claim 1, wherein a non-woven fabric made of a spun bond method is used. 4. The surface material according to claim 1, wherein a non-woven fabric formed by a melt blown method is used.