JPH11129370A - Far infrared emitting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop the thermal/heat-insulating effect of a far infrared emitting sheet and to enhance the flexibility thereof by successively laminating a skin layer, a heat-insulating layer, a far infrared emitting layer and a coating layer all of which are respectively specified. SOLUTION: A skin layer 10, a heat-insulating layer 11, a far infrared emitting layer 12 and a coating layer 13 are successively laminated to obtain a far infrared emitting sheet 1. As the skin layer 10, a molded synthetic resin sheet or film is used and, as the heat-insulating layer 11, a synthetic resin foam sheet including an air layer or a nonwoven fabric is used. The far infrared emitting layer 12 is formed by impregnating a nonwoven fabric made of synthetic fibers with either one of carbon fibers, carbon particles, zirconium carbide and zirconium oxide. As the coating layer 13, a fabric, a raised knitted fabric or a nonwoven fabric having high in density and good in touch is pref. used in order to prevent the falling-off of a far infrared emitting substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for absorbing a heat generated by a human body by a far-infrared ray radiating substance contained in a nonwoven fabric.
It is a sheet that emits infrared to far infrared rays (hereinafter referred to as far infrared rays) of 50 to 50 μm and keeps the human body warm. It is especially cut into a free shape, attached to gloves, shoes, slippers, etc. The present invention relates to a far-infrared radiating sheet capable of obtaining an excellent heat retaining effect without using a heat source such as electricity from the outside.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique of coating a ceramic which emits far-infrared rays on a thin film of aluminum, copper, plastic or the like (JP-A-51-6381).
1). Further, there is disclosed an invention relating to a far-infrared radiating sheet having a structure in which a projection is provided on a carbon-based synthetic resin and a nonwoven fabric is bonded to both surfaces thereof (utility model registration No. 30).
26964).

[0003] By the way, carbonaceous materials and other ceramics having far-infrared radiation are placed close to the human body,
When heated at body temperature, as shown in FIG. 6 (published by Asakura Shoten, Encyclopedia of Physics) showing black body radiation at different temperatures, far infrared rays around 10 μm are emitted at about 310 K of human body temperature. In particular, it is known that far-infrared rays having a wavelength of about 6 to 12 μm are absorbed by the human body and cause a person to feel warmth by a thermal effect. Further, the warming effect or the heat retaining effect of the far infrared rays naturally increases as the concentration or the added amount of the far infrared radiation material such as ceramic in the sheet increases.

However, as described in the above publication, in the conventional method of forming a coating containing ceramic on the surface of a metal plate or a resin plate by coating, a large amount of ceramic adheres only to the surface and keeps the human body warm. It is difficult to attach such a sheet, and there has been a problem that this type of conventional sheet lacks flexibility and is not suitable for keeping the human body warm from the viewpoint of feel.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and radiates far-infrared rays by contacting a human body, thereby simultaneously preventing radiation of heat to the outside and accumulating heat. It is an object of the present invention to provide a far-infrared radiating sheet which is excellent in heat and heat retention effect by conducting the generated heat to a human body and has high flexibility.

[0006]

In order to solve the above-mentioned problems, the present invention provides a skin layer made of one of knitted fabric, woven fabric, non-woven fabric, leather, natural rubber or synthetic rubber or synthetic resin, Insulating layer made of synthetic resin foam or non-woven fabric, at least inorganic fiber, non-woven fabric made of one of synthetic fiber or natural fiber at least carbon fiber, carbon particles,
Far-infrared radiation layer impregnated with either zirconium carbide or zirconium oxide, and knitted fabric, woven fabric, non-woven fabric, leather, a coating layer made of one of natural rubber or synthetic rubber or synthetic resin, sequentially this A far-infrared radiating sheet laminated in this order.

[0007] In order to solve the above-mentioned problems, the present invention relates to a knitted fabric, a woven fabric, a nonwoven fabric, a leather, a natural rubber or a synthetic rubber or a synthetic resin, and at least an inorganic fiber; At least carbon fibers, carbon particles, at least one of zirconium carbide and zirconium oxide impregnated into a non-woven fabric made of one of synthetic fibers or natural fibers, and a far-infrared radiation layer, and a heat insulating layer made of a synthetic resin foam or non-woven fabric , A pressure-sensitive adhesive layer and a release sheet in which a release agent is applied to one surface of a base sheet made of paper or a synthetic resin sheet, and a release sheet in which the coated surface faces the pressure-sensitive adhesive layer. Infrared radiation sheet.

In order to solve the above-mentioned problems, the present invention provides the heat insulating layer, wherein the synthetic resin foam or the nonwoven fabric is provided with a vapor-deposited surface of an aluminum vapor-deposited film on one surface thereof. It is preferable that the other surface of the foam or the nonwoven fabric is laminated so as to face the far-infrared radiation layer.

[0009] In order to solve the above-mentioned problems, the present invention provides a method according to the present invention, wherein the far-infrared radiating layer comprises a synthetic fiber premixed with either zirconium carbide or zirconium oxide;
Alternatively, it is preferable that the nonwoven fabric is formed of a nonwoven fabric formed of at least one of carbon fibers.

[0010] In order to solve the above-mentioned problems, the present invention is directed to a method of the present invention, wherein the far-infrared radiating layer is formed by dispersing carbon fiber, carbon particles, zirconium carbide, zirconium oxide or another ceramic having far-infrared radiating properties. It is preferable that the nonwoven fabric is immersed in a bath, and these are contained in the nonwoven fabric.

[0011] In order to solve the above-mentioned problems, the present invention is directed to the present invention, in which all of the skin layer, the heat insulating layer, the far-infrared radiating layer, and the coating layer are made of a material having flexibility. It is preferable that the sheet itself has flexibility.

[0012]

According to the first aspect of the present invention, the far-infrared radiating substance impregnated in the nonwoven fabric emits far-infrared rays of about 10 μm as described above by being heated at the temperature of the human body. Far infrared rays having a wavelength of about 6 to 12 μm therein are absorbed by the human body, and at the same time, a heat insulating layer provided in the middle of the skin layer prevents heat radiation to the outside,
The heat accumulated between the two layers is transmitted to the human body by the heat conduction action, and makes the person feel warm and keeps the human body warm. Further, the provision of the coating layer serves to prevent the far-infrared radiating substance from falling off.

According to the second aspect of the present invention, in addition to the above-mentioned functions, a release sheet is provided on the far-infrared radiation layer via an adhesive layer. Then peel off the release sheet, gloves, shoes, slippers,
It can be easily attached to underwear and the like.

According to the third aspect of the present invention, since the aluminum layer is provided on the heat insulating layer, the heat insulating effect is enhanced, and the heat due to the far infrared rays is reflected on the human body to enhance the heat sensing effect.

In the invention according to claim 4, since the synthetic fiber in which the far-infrared radiating substance is mixed in advance is used,
There is no danger of the far-infrared radiation material falling off, and a permanent heat retaining effect can be obtained. In addition, the far-infrared radiation sheet mixed with zirconium carbide and zirconium oxide has the property of absorbing visible light such as sunlight and near-infrared rays and reflecting far-infrared rays, and can prevent body heat from dissipating. It acts as a heat insulator.

According to the fifth aspect of the present invention, since the far-infrared radiating substance is attached by a dipping method, a large amount of far-infrared radiating substance can be taken into the nonwoven fabric, and thus the far-infrared radiation according to the present invention can be obtained. The sheet is
Depending on the temperature of the human body, it acts to radiate far-infrared rays sufficient to contribute to the heat retention effect.

According to the sixth aspect of the present invention, since the sheet body is made of a flexible material, the sheet itself is flexible, so that when the sheet comes into contact with the human body, it is adapted to the movement of the human body. It acts to give a pleasant feel.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The skin layer 10 of the present invention can be selected from the above-described materials and used alone or in combination with a decorative material suitable for the purpose of use. Examples of the synthetic resin include vinyl chloride resin, polyester, acrylic resin, and the like, which have excellent design properties, and those obtained by molding these resins into a sheet or film by calendering, extrusion, casting, or the like are used. Further, a printed pattern or an embossed pattern can be applied to the skin layer as needed.

The heat insulating layer 11 is made of a synthetic resin foam or non-woven fabric containing an air layer inside. As the synthetic resin foam, urethane foam, polyethylene foam, vinyl chloride resin foam and the like are usually used. An adhesive is usually used to laminate these foams and the skin layer, but those made of the same type of thermoplastic resin may be welded by heat fusion. Further, the surface layer of the urethane foam may be formed by melting the surface of the urethane foam with a gas flame and sticking a cloth or the like on the melted surface.

The method for forming a far-infrared radiating layer 12 by impregnating a non-woven fabric such as a synthetic fiber with carbon fibers, carbon particles, and other ceramics that emit far-infrared rays includes a dipping method, a roll coater method, a spraying method, and the like. There is a gravure printing method or the like, and any method may be used. In order to efficiently impregnate a lot of far-infrared radiation materials into the nonwoven fabric, a dipping method or a reverse roll coater method is preferable.

According to the dipping method, the nonwoven fabric is immersed in a solution in which a far-infrared ray-emitting substance is uniformly dissolved in advance, taken out of the solution, squeezed, and then dried, as in a usual dyeing process. In order to fix the far-infrared ray emitting substance in the nonwoven fabric, a solution in which a far-infrared ray emitting substance is mixed with a fixing resin may be used.

By using a non-woven fabric made of fibers into which zirconium carbide is kneaded, for example, heat storage fibers developed by Unitika and Descente, a stronger heat storage effect can be obtained. These far-infrared-emitting fibers may be used alone or in combination with other synthetic fibers or natural fibers as much as possible.

The coating layer 13 is made of a woven cloth having a large density and a good touch in order to prevent the far-infrared radiation material from falling off.
It is preferable to use a knitted raised fabric or a nonwoven fabric.

The release sheet 15 is formed by applying a release agent such as polyolefin or silicone to a commonly used paper or synthetic resin sheet. Release agent layer 15A
After applying a rubber-based pressure-sensitive adhesive to the surface of the sheet using, for example, a roll coater, a doctor coater or the like, the far-infrared radiation sheet 1 is obtained by pressure bonding with the coating layer 13.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, typical embodiments will be described with reference to the drawings. However, the present invention is not limited by the embodiment. Embodiment 1 FIG. 1 shows an embodiment according to the present invention including the first and fourth to sixth aspects.
c, the soft urethane foam having a thickness of 3 mm, and the far-infrared ray emitting layer 12 are obtained by impregnating a non-woven fabric made of 100 g / m ² polyester fiber with far-infrared ray emitting carbon fibers by dipping. The coating layer 13 is made of a nylon tricot of 40th count.

Next, a method of manufacturing the far-infrared radiation sheet according to the above embodiment will be described. First, a urethane-based adhesive is applied to the back surface of a soft vinyl chloride resin sheet, and the coated surface is heated and overlapped with a soft urethane foam, pressed with a roll, cooled and wound up. Next, a nylon tricot of a coating layer is overlapped on one surface of the nonwoven fabric and integrated by sewing with a sewing machine. Next, the surface of the urethane foam bonded and integrated with the skin layer was heated and melted with a gas flame, the nonwoven fabric was overlaid on the molten surface, the whole was pressed, and the laminate was integrated to obtain the far-infrared radiation sheet 1.

Embodiment 2 FIG. 2 shows an embodiment relating to the invention including the first and third to sixth aspects. The portion corresponding to the skin layer 10 is obtained by laminating the soft vinyl chloride resin sheet used in Example 1 on the surface of the polyester film using a polyester-based adhesive, and performing aluminum vapor deposition on one surface of the polyester film. Yes, such aluminum deposition surface 1
The heat insulating layer 1 is formed by laminating the urethane foam 11C on 1B.
1 was formed. A far-infrared radiating sheet 1 was obtained in the same manner as in Example 1 except that a polyester-based adhesive was used for adhesion between the aluminum-deposited film and the urethane foam.

Embodiment 3 FIG. 3 shows an embodiment relating to the invention including the second and fourth to sixth aspects. The covering layer 13 is a double-sided knitted yarn of 30th cotton yarn, and the heat insulating layer 11 has a foaming ratio of 30 times and a thickness of 2.5 mm.
The foamed polyethylene and the far-infrared radiating material used were those obtained by mixing zirconium-based ceramics with carbon particles. The release sheet 15 is formed by coating one side of the kraft paper of the base sheet 15A with polyethylene as a release agent.

Next, the manufacturing method will be described. First, an acrylic rubber-based pressure-sensitive adhesive is coated on the entire surface of the release sheet on which the release agent is applied. A non-woven fabric containing an infrared emitting material and a double-sided knitted yarn of 30th cotton yarn were sequentially laminated in this order to obtain a far infrared emitting sheet 1. The lamination method is the same as that of the first embodiment.

Fourth Embodiment FIG. 4 shows an embodiment according to the present invention. A release sheet 15 was formed on the polyester film surface of the aluminum vapor-deposited film of Example 2 via an adhesive layer 14.
Were laminated in the same manner as in Example 3 to obtain a far-infrared radiation sheet 1.

Comparative Example FIG. 5 shows a comparative example. A mixture of the same far-infrared radiating substance as used in Example 3 in an acrylic resin solution was applied to the entire surface of one side of the polyester film by a gravure printing method, and a non-woven fabric containing no far-infrared radiating substance was laminated thereon. A comparative sample was prepared in the same manner as in Example 3, except that the comparative sample was used as an infrared radiation layer.

Experimental Example The far-infrared radiating sheets obtained in Examples 1, 2, 3, 4 and Comparative Example were cut into predetermined sizes, respectively, and formed into a bag shape with one side opened with the covering layer 13 of the sheet inside. The formed product is fitted inside the slipper, and in the case of Examples 3 and 4, the base sheet 15B of the release sheet 15 is peeled off and adhered, and the others are sewn to the slipper main body. Were alternately used by three men and women for a total of six people for one week, and a temperature sensitivity test was performed.

Experimental Results As a result of the above experiment, all of the experimenters felt that the slippers using the far-infrared radiating sheet of the embodiment were extremely warm compared with those without the far-infrared sheet or those of the comparative example. Was. Among Examples 1 to 4, Examples 2 to 4 in which aluminum was used for the heat insulating layer 11 had relatively high heat retention, and in particular, Example 4 felt more warm. This is presumed to be due to a difference in the thermal conductivity of the material (cotton yarn, nylon) of the coating layer 13. The same was true for Examples 1 to 3.

[0034]

As described above, the far-infrared ray radiating sheet according to the present invention has a carbon fiber, carbon particles and other far-infrared ray radiating substances impregnated in a non-woven fabric. The absorbed far-infrared rays are absorbed by the human body, giving a sense of warmth, and have the effect of keeping the human body warm. Odor and moisture are absorbed by the adsorbing action of carbon fibers and carbon particles, which is effective for use in shoe soles and the like to prevent bad smell and unevenness. In addition, since it does not use electricity or another heat source, it can be used freely outdoors. In the case where the release sheet is laminated, the base sheet is peeled off and it can be easily attached to the adherend, gloves, the inside of shoes, the limbs can be easily warmed simply by sticking to the toe part of the slipper, It is convenient because it can be warm.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a far-infrared radiation sheet of Example 1.

FIG. 2 is a partially enlarged cross-sectional view of a far-infrared radiation sheet of Example 2.

FIG. 3 is a partially enlarged cross-sectional view of a far-infrared radiation sheet according to a third embodiment.

FIG. 4 is a partially enlarged cross-sectional view of a far-infrared radiation sheet of Example 4.

FIG. 5 is a partially enlarged cross-sectional view of a far-infrared radiation sheet of a comparative example.

FIG. 6 is a diagram showing the wavelength distribution of the radiation output of the black body radiator at different temperatures.

[Explanation of symbols]

1: far infrared radiation sheet, 10: skin layer, 11: heat insulation layer, 11B: aluminum layer, 11C: foam layer, 12:
Far-infrared radiation layer, 12A: film layer, 12B: ceramic coating layer, 13: coating layer, 14: adhesive layer,
15: release sheet, 15A: release agent layer, 15B: base material sheet, 16: resin layer, 17: nonwoven fabric

Claims (6)

[Claims] 1. A skin layer comprising one of knitted fabric, woven fabric, non-woven fabric, leather, natural rubber or synthetic rubber or synthetic resin,
A heat insulating layer made of a synthetic resin foam or nonwoven fabric and a nonwoven fabric made of at least one of inorganic fibers, synthetic fibers and natural fibers impregnated with at least one of carbon fibers, carbon particles, zirconium carbide or zirconium oxide. Infrared radiation layer, knitted fabric, woven fabric, non-woven fabric, leather,
A far-infrared radiating sheet in which a coating layer made of one of natural rubber, synthetic rubber and synthetic resin is sequentially laminated in this order. 2. A coating layer comprising one of knitted fabric, woven fabric, non-woven fabric, leather, natural rubber or synthetic rubber or synthetic resin,
At least carbon fibers, carbon particles, a far-infrared radiating layer impregnated with any of zirconium oxide or zirconium oxide, and a synthetic resin foam or nonwoven fabric. A heat-insulating layer, a pressure-sensitive adhesive layer, and a release sheet in which a release agent is applied to one surface of a base sheet made of paper or a synthetic resin sheet, and the coated surface faces the pressure-sensitive adhesive layer,
Far-infrared radiation sheet obtained by sequentially laminating. 3. The heat-insulating layer is formed by laminating a vapor-deposited surface of an aluminum vapor-deposited film on one surface of the synthetic resin foam or nonwoven fabric, and irradiating the other surface of the synthetic resin foam or nonwoven fabric with the far-infrared radiation. The far-infrared radiation sheet according to claim 1 or 2, wherein the far-infrared radiation sheet is laminated so as to face the layer. 4. The method according to claim 1, wherein the far-infrared radiation layer is made of a synthetic fiber containing at least one of zirconium carbide and zirconium oxide, or a non-woven fabric formed of at least one of carbon fibers. 3. The far-infrared radiation sheet according to 3. 5. The non-woven fabric according to claim 5, wherein the far-infrared radiation layer is immersed in a dispersion bath in which carbon fibers, carbon particles, zirconium carbide, zirconium oxide or other ceramic having far-infrared radiation are dispersed. 5. The far-infrared radiating sheet according to claim 1, wherein the far-infrared radiating sheet is contained. 6. A method according to claim 1, wherein each of the skin layer, the heat insulating layer, the far-infrared radiation layer, and the coating layer is made of a flexible material, and the laminated sheet itself has flexibility. Item 6. The far-infrared radiation sheet according to any one of Items 1 to 5.