JPH10151151A - Heating bag for footgear and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating bag for footgear which has high flexibility and by which the contents are not deviated by superposing vegetable fiber-made nonwoven fabrics having a large number of voids by plural layers, molding a material by holding heating composition powder in at least the nonwoven fabric of a single layer in a sheet shape, and housing this in a gas permeable bag. SOLUTION: When a heating bag for footgear is manufactured, water is sprayed on an under surface of nonwoven fabric 4 from a roller 10 by a water spraying part 12, and nonwoven fabric 5 from a roller 11 is superposed on an upper surface of nonwoven fabric 4 by sticking force of water by a roller part 13. Next, heating composition powder is sprayed by a heating composition powder sparying part 14, and is held in voids of the nonwoven fabric 4 by imparting vibration, and nonwoven fabric 6 from a roller 15 is superposed on this upper surface by a roller part 16, and is cut in the desired size by a cutting part 18 after being compressed by a compressing part 17. Afterwards, a sheet-like heating element 3 manufactured by spraying water or an electrolyte aqueous solution by a water or electrolyte aqueous solution spraying part 19, is housed in a gas permeable bag by a filling part 20, and a heating bag 1 for footgear is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generating bag for footwear using a sheet-shaped heat generating element, and more particularly, to a heat generating composition for footwear which is thin, has no unevenness of a heat generating composition, and has excellent heat generating performance. About bags.

[0002]

2. Description of the Related Art Conventionally, exothermic bags containing an oxidizable metal such as iron powder as a main component and generating heat upon contact with oxygen in the air in an air-permeable bag have been widely used as a pottery. It's being used. Further, a heat-producing bag for footwear used for shoes or slippers, etc., in which the shape of the breathable bag is horseshoe-shaped or trapezoidal, has also been proposed (Japanese Utility Model Application Laid-Open No. 59-71618). Each of these footwear heating bags is made of iron powder, activated carbon,
A wet powder obtained by mixing a water retention agent, an aqueous solution of an inorganic electrolyte, and the like is stored in a gas-permeable bag, and is sealed and stored in a non-gas-permeable outer bag until further use. At the time of use, the outer bag is broken to take out the heat generating bag, which is used by being mounted in footwear.

[0003]

However, when the conventional heat generating bag for footwear is used in shoes, the temperature of the heat generating bag for footwear rises rapidly when walking, even if it is warm and comfortable at rest. Not only was there a risk of burns.
On the other hand, if the heat generation temperature of the footwear heating bag is set low so that the temperature becomes comfortable when walking, there is a disadvantage that sufficient heat generation cannot be obtained at rest. In addition, the conventional heat-generating bag for footwear has disadvantages such as swelling when worn in shoes, and deviation of the heat-generating composition during use, resulting in an uncomfortable feeling. Furthermore, if the heat-generating composition is used while being biased, the portion where the heat-generating composition is gathered may locally generate heat at a high temperature, and there is a risk of burns.

On the other hand, the exothermic composition is held in the voids of a multi-layered nonwoven fabric composed of heat-fusible fibers and plant fibers, and the exothermic composition is thermocompressed into a sheet-like heating element and stored in a breathable bag. Heated bags for footwear have also been considered. This heat generating bag for footwear has an excellent characteristic that the heat generating temperature is substantially constant both at rest and during walking. However, since the non-woven fabric made of the heat-fusible fiber has low water retention, the thickness of the sheet-like material is inevitably increased in order to retain moisture, and the heat-fusible fiber is used to form the sheet. When the nonwoven fabric is heated and compressed, it has a strong net-like structure, and has a disadvantage that it becomes hard and uncomfortable. From these facts, it is desired to develop a heating bag for footwear which can provide a comfortable temperature without being affected by the use condition, is thin and flexible, and in which the heating composition is securely held and does not move. Was.

[0005]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve these problems, and as a result, have found that the voids of at least one of the nonwoven fabrics made of a plurality of nonwoven fabrics made of vegetable fibers superposed by the adhesive force of water. Hold the mixture of exothermic composition powder in
It has been found that these problems can be solved by storing a sheet-like heating element obtained by compression with a mold compressor in a bag having air permeability, and arrived at the present invention. That is, in the present invention, a plurality of nonwoven fabrics made of vegetable fiber having a large number of voids are laminated, and the exothermic composition powder is held in at least one of the nonwoven fabrics. A heat-generating bag for footwear, characterized in that a molded sheet-shaped heat generating element impregnated with water or an aqueous solution of an inorganic electrolyte is housed in a bag having air permeability.

In the present invention, a nonwoven fabric b made of vegetable fiber is superimposed on the lower surface of a nonwoven fabric made of vegetable fiber having a large number of voids by the adhesive force of water, and a heat-generating composition powder is sprayed from the upper surface of the nonwoven fabric a. After being held in the air gap, the nonwoven fabric c made of vegetable fiber is superimposed on the upper surface of the nonwoven fabric a, compressed by a mold compressor, and then a sheet-like heating element impregnated with water or an aqueous electrolyte solution is stored in a breathable bag. A method for producing a heat generating bag for footwear, characterized in that:

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is mainly applied to a heat generating bag for footwear which is mounted in footwear such as shoes and slippers and used for keeping a foot warm.

The heat generating bag for footwear of the present invention has a heat generating composition held in a nonwoven fabric laminate. Here, as a method of holding the exothermic composition on the nonwoven fabric, for example, iron powder,
Activated carbon, an inorganic electrolyte, a mixture of water and the like may be dispersed on a nonwoven fabric and held by a method such as applying vibration or pressing. After the mixture is sprayed on the nonwoven fabric and vibrated to hold it in the voids, water may be sprayed on the nonwoven fabric, or a mixture of powdered raw materials excluding inorganic electrolytes such as iron powder and activated carbon may be spread on the nonwoven fabric. After applying the vibrations to hold them in the voids, the aqueous solution of the inorganic electrolyte may be sprayed and impregnated. Among these, it is preferable because the state containing no water is easier to hold in the voids of the nonwoven fabric, and further, it is difficult for the method to uniformly penetrate the inorganic electrolyte throughout, and the oxidizable metal It is more preferable that the oxidation of the powder starts at the time of mixing the water. From the above, the exothermic composition is held by the usual method.

Hereinafter, the present invention will be described mainly by a manufacturing method based on a method. In the present invention, the nonwoven fabric a is capable of holding a mixture (hereinafter referred to as a heat-generating composition powder) of a heat-generating composition raw material that generates heat upon contact with air in a void thereof and having a water retention ability. Is big,
For example, it is mainly composed of plant fibers such as pulp, cotton, hemp, rayon, and acetate (regenerated fibers such as rayon and acetate are also included in the plant fibers in the present invention). The production method may be one formed by entanglement of fibers, or one formed by using a synthetic resin, an adhesive, or the like as a binder to the extent that the nonwoven fabric does not have heat-fusing properties. Good. Although the thickness varies depending on the amount of the exothermic composition powder held, etc., it is usually 0.5 to 10 mm,
Preferably it is 1 to 7 mm. The basis weight is usually 20 to 1
50 g / m ^2, preferably from 30 to 100 g / m ^2.

The nonwoven fabric b is for preventing the exothermic composition powder from leaking from the lower surface of the nonwoven fabric a, and is used by being superposed on the lower surface of the nonwoven fabric a. As a material of the nonwoven fabric b, a nonwoven fabric mainly containing plant fibers such as pulp, cotton, hemp, rayon, and acetate, and a paper-like material such as tissue paper are preferable. Usually, a material having a denser structure than that of the nonwoven fabric a is used.
0 g / m ^2, preferably 15 to 40 g / m ^2.

The nonwoven fabric c is for holding the exothermic composition powder remaining on the upper surface of the nonwoven fabric a that cannot be completely retained by the nonwoven fabric a and for preventing the exothermic composition powder from leaking from the upper surface. Used on the upper surface of the nonwoven fabric a. As the material, those having a large number of voids and having a large water retention capacity are preferable, for example, pulp,
It is a nonwoven fabric made of vegetable fibers such as cotton, hemp, rayon, and acetate. The thickness of the nonwoven fabric c varies depending on the holding amount of the heat-generating composition, but is usually 0.2 to 7 mm, preferably 0.5 to 5 mm. In addition, the grammage is usually 10
100 g / m ^2, preferably 20 to 80 g / m ^2.

The raw materials constituting the exothermic composition powder include:
Oxidizable metal powder, activated carbon and the like. The inorganic electrolyte is a component of the exothermic composition powder when mixed with the above raw materials as a solid, and is not included in the exothermic composition powder when impregnated as an aqueous solution after sheet formation. The oxidizable metal powder includes iron powder, aluminum powder, and the like. Usually, iron powder is used, such as reduced iron powder, atomized iron powder, and electrolytic iron powder. Activated carbon is used not only as a reaction aid but also as a water retention agent, and is usually coconut shell charcoal, wood powder charcoal, peat charcoal and the like. As the inorganic electrolyte, alkali metals, alkaline earth metals, chlorides of heavy metals, sulfates of alkali metals and the like are preferable, for example, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, ferric chloride,
Sodium sulfate or the like is used. The exothermic composition refers to a mixture of the exothermic composition powder and water or an aqueous electrolyte solution. In addition, if desired, a polymer water retention agent, a hydrogen generation inhibitor, an anti-caking agent, and the like can be added.

The particle size of the exothermic composition powder is usually 60 mesh or less, preferably 100 mesh or less.
% Or more. The mixing ratio of the heat-generating composition as a whole depends on the properties of the nonwoven fabric, the desired heat-generating performance, and the like, and cannot be specified unconditionally.
Activated carbon is 5 to 20 parts by weight, inorganic electrolyte is 1.5 to 10 parts by weight, and water is 25 to 60 parts by weight with respect to 00 parts by weight.

Next, an example of a structure and a manufacturing method of the heat generating bag for footwear according to the present invention will be described with reference to the drawings, but the present invention is not limited to this example. FIG. 1 is a plan view of the footwear heating bag 1. FIG. 2 shows A of the heating bag 1 for footwear.
FIG. 4 is a cross-sectional view taken along a line A. 2 is a bag having air permeability, and 3 is a sheet-like heating element. Reference numeral 4 denotes a nonwoven fabric a, 5 denotes a nonwoven fabric b, and 6 denotes a nonwoven fabric c. Reference numeral 7 denotes an exothermic composition, 8 denotes an adhesive, and 9 denotes a release paper. FIG. 3 shows an example of the manufacturing process of the present invention. 1
0 is a roll of nonwoven fabric a, 11 is a roll of nonwoven fabric b, 12
Is a water spraying part, 13 is a roll part, 14 is a heat generating composition powder spraying part, 15 is a roll of the nonwoven fabric c, 16 is a roll part, 17
Denotes a compression unit by a mold compressor, 18 denotes a cutting unit, 19 denotes a water or electrolyte aqueous solution spraying unit, and 20 denotes a filling unit into a bag having air permeability.

Water is sprayed on the lower surface of the nonwoven fabric a4 by the water spraying unit 12, and the nonwoven fabric b is formed on the upper surface of the nonwoven fabric a4 by the roll unit 13.
5 is superimposed on the adhesive force of water. Next, the exothermic composition powder is sprayed in the exothermic composition powder dispersing section 14, and at the same time, vibration is applied to the exothermic composition powder to be held in the voids of the nonwoven fabric a. Next, the nonwoven fabric c6 is superimposed on the upper surface by a roll portion 16, further compressed by a compression portion 17 by a mold compressor, and cut into a desired size by a cutting portion 18. Next, the water or electrolyte aqueous solution is sprayed in the water or electrolyte aqueous solution spraying section 19. Thus, the sheet-shaped heating element 3 is manufactured. Furthermore, it is stored in a breathable bag at the filling section 20 into the breathable bag, and the heat generating bag 1 for footwear is obtained.

In the present invention, by adhering water between the layers of the non-woven fabric, the non-woven fabrics are closely adhered to each other by the adhesive force of water to form a sheet. As a method of adhering water, it is sufficient that the amount of water adhered can be adjusted and the water can be uniformly adhered. For example, there are a method of spraying water and a method of adhering water with a roll. When adhering to the lower surface of the nonwoven fabric a, the amount of water depends on the wetness of the composition powder due to the wetness of the nonwoven fabric a.
It is sufficient to prevent leakage from the lower surface of the nonwoven fabric, and it varies depending on the basis weight and material of the nonwoven fabric.
g / m ^2, preferably from 20 to 120 g / m ^2. In addition, instead of attaching water to the lower surface of the nonwoven fabric a,
It can also be performed by a method of attaching water to the upper surface of the nonwoven fabric b. Further, when the nonwoven fabric c is overlapped, water may be attached to the lower surface of the nonwoven fabric c. In these cases, the nonwoven fabric a
Can be carried out in the same manner as the method of attaching water to the lower surface of the substrate.

The amount of the exothermic composition retained on the nonwoven fabric is determined according to the thickness of the nonwoven fabric, the desired thickness of the heating element, the desired heat generation performance, and the like.
300 to 5000 g per ² , preferably 700 to 20
00 g. When the holding amount is less than 300 g, the heat generation temperature and the heat generation duration decrease, while the holding amount is 5000 g.
If it is larger, the thickness of the heating element increases, and it is difficult to form a thin and flexible sheet.

The compression can be performed by passing through a press or a roll. Compression can be performed with a flat or flat roll, but in order to improve the shape fixing effect while maintaining the flexibility of the sheet-like material, it is preferable that at least one of the compression surfaces is an embossed surface. Although the shape of the embossed pattern is not particularly limited, it is usually a wave-like, turtle-like, ring-like, polka-dot, or mesh-like pattern, and is preferably a shape in which the heat-generating composition powder can be easily removed by the non-compressed portion during compression.
The area ratio of the projections on the embossed surface is not particularly limited, but is usually 0.5 to 60.0%, preferably 5.0 to 4%.
0.0%.

The compression is possible at room temperature,
It is more preferable to heat at a temperature of 00 ° C. Since water is adhered when the nonwoven fabrics are superimposed, by heating, the surface to which the water is adhered and the surface in contact with the water are more reliably fixed in shape by the wet heating effect. The linear pressure of the compression varies depending on the material of the nonwoven fabric a, the nonwoven fabric b, and the nonwoven fabric c and the amount of the heat-generating composition powder held, but is usually 0.1 to 2
It is 50 kg / cm.

The thickness of the sheet-shaped heating element is preferably as thin as possible so long as the amount of the heat-generating composition necessary for exhibiting the desired heat-generating performance such as a desired heat-generating temperature and duration can be maintained. It is as follows. The size and shape of the sheet-like heating element are not particularly limited as long as the size and shape can be put into a bag having air permeability, for example, a toe shape of a shoe sole, a rectangle, a square, a circle, a semicircle, an ellipse, For example, a semi-elliptical shape. The amount impregnated with water or the inorganic electrolyte aqueous solution is the total amount of the water or the inorganic electrolyte aqueous solution set as the composition ratio of the exothermic composition, and these are supplied by spraying, dripping, or roll impregnation, and impregnated, and the sheet is impregnated. It becomes a heating element.

In the present invention, the air-permeable bag is a bag in which at least one of the front and back surfaces of the bag is formed of a breathable packaging material. The air-permeable packaging material does not necessarily need to have its ventilation holes provided uniformly over the entire surface, but may be provided partially. There is no particular limitation on the material of the breathable packaging material, as long as it can supply air in an amount necessary for heat generation of the heat-generating composition and has strength enough to withstand friction or rubbing pressure during use. Well, for example, a nonwoven fabric is laminated to a synthetic resin film such as polyethylene, polypropylene, polyester, polyvinyl chloride, etc., and a porous film having a large number of fine holes, or a porous film having a large number of fine holes, Is a product obtained by laminating a nonwoven fabric or the like on a porous film.

The shape of the breathable bag is not particularly limited as long as it can be accommodated in footwear.
For example, any shape such as rectangle, square, circle, ellipse, semicircle, semiellipse, and sole shape can be used, but the toe shape of the sole, semicircle, semiellipse, etc. Particularly suitable for the shape.

In the present invention, an adhesive layer may be provided on the whole or a part of one side of the heating bag in order to enhance the fixation of the heating bag for footwear at the mounting portion. The pressure-sensitive adhesive may be non-transferable pressure-sensitive adhesive that does not move when the heating bag is stuck in footwear and does not transfer to the footwear side when peeled off. An organic solvent-based or water-based non-transferable pressure-sensitive adhesive such as a rubber-based resin, an acrylic resin-based resin, or a vinyl acetate resin-based resin is preferably used.

When a pressure-sensitive adhesive layer is provided, a release paper is superimposed on the pressure-sensitive adhesive layer so as not to adhere to other objects until the pressure-sensitive adhesive layer is used. As the release paper, those having properties similar to those used for generally commercially available pressure-sensitive adhesive sheets, tapes, stickers, etc. can be used. It has improved releasability.

The heat generating bag for footwear according to the present invention is sealed and stored in a non-breathable outer bag until the time of use, in order to prevent oxidation of the oxidizable metal. FIGS. 2 and 3 show examples of a heating bag for footwear using a sheet-like heating element in which three layers of nonwoven fabric are laminated and a method of manufacturing the same. However, the present invention may have a two-layer structure of nonwoven fabric a and nonwoven fabric c. Further, a laminate having a two-layer structure or a three-layer structure may be used alone or in combination.

As described above, the exothermic composition is held in the nonwoven fabric made of vegetable fibers having a large number of voids, and the exothermic body formed into a sheet by compressive force and adhesive force of water is stored in a breathable bag. A comfortable heating temperature that is not affected by usage conditions such as at rest or walking can be obtained. became. Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.

[0027]

【Example】

Example 1 ^On a tissue paper having a basis weight of 25 g / m ² , water was sprayed on the lower surface to moisten it to a thickness of about 1.1 mm and a basis weight of 40 g / m 2.
² wood pulp non-woven fabric (Kinocross, manufactured by Honshu Paper Co., Ltd.), 90 parts of iron powder, 8 parts of activated carbon,
A mixture of 2 parts of the polymer water retention agent was sprayed at a rate of 1500 g / m ² and vibration was applied to hold the mixture in the voids of the nonwoven fabric. Next, on the upper surface of the nonwoven fabric, a nonwoven fabric made of wood pulp having a thickness of 1.2 mm and a basis weight of 60 g / m ² (Honshu Paper Co., Ltd.)
And kino cloth) are superimposed on each other, and an emboss is provided on the upper roll surface in a mesh form at 200 ° C. and a linear pressure of 1 mm.
The sheet was passed through a roll heating compressor set at 33 kg / cm and formed into a sheet. The size of this sheet is about 6
The shoe sole was cut into a 0 mm × 80 mm shoe sole toe shape, and a 20% saline solution was sprayed at a rate of 570 g / m ² to a thickness of 2 mm.
Was obtained.

Next, an acrylic ester-based pressure-sensitive adhesive was applied to the nonwoven fabric side of a sheet in which a nonwoven fabric made of nylon having a basis weight of 50 g / m ² and a polyethylene film having a thickness of 50 μm were bonded. A silicone-treated release paper was overlaid on the adhesive-coated surface to form a non-breathable sheet. After a polyethylene porous membrane (manufactured by DuPont, Tyvek 1073B) having a Gurley type air permeability of 20 seconds / 100 cc specified by ASTM D762 is superimposed on this non-breathable sheet so that the polyethylene sides are in contact with each other. , Size about 8
The shoe sole was cut into a toe shape of 0 mm × 100 mm, and the periphery of the toe-shaped curved portion of the shoe sole was heat-sealed to produce a bag having air permeability. The sheet-like heating element is housed in the bag-like material, and the opening is heat-sealed to have a thickness of about 2.3.
mm heat-producing bags for footwear were produced. During this time, the exothermic composition powder did not fall off.

The heat generating bag for footwear is further sealed in an air-impermeable outer bag and stored for 2 days. After that, the heat generating bag for footwear is taken out of the outer bag, and the inside of the athletic shoe is placed so that the porous membrane side faces upward. The heat generation performance of the heat generation bag for footwear was measured as follows. A copper-constantan thermocouple is attached to the center of the upper surface of the heating bag for footwear, and after sitting in a chair for 20 minutes in an environment of a temperature of 10 ° C. and a humidity of 60%, 5k / h
After walking at a speed of m for 30 minutes, sitting on a chair for another 10 minutes, and measuring the temperature change of the heating bag for footwear at rest and while walking. FIG. 4 shows the results. As a result, 2
After 30 minutes, the temperature reached 30 ° C., and at rest, the temperature was kept constant at around 40 ° C., and the patient was comfortable. In addition, there is no sharp rise in temperature when walking, and it is constant around 40 ° C to 45 ° C.
It was comfortable. In addition, the heat-generating bag for footwear could be easily mounted without mounting the heat-generating composition at the time of mounting. In addition, even when walking, the exothermic composition did not shift, and no discomfort occurred.

Comparative Example 1 6.8 g of iron powder, 0.7 g of activated carbon, 0.7 g of salt, and 2 parts of water
g, and a heat generating composition obtained by mixing 0.3 g of a polymer water retention agent in a nitrogen atmosphere is filled in a bag having the same air permeability as in Example 1, and a heat generating bag for footwear having a thickness of about 3 mm is filled. Produced.
After sealing the heating bag in a non-breathable outer bag and storing it for two days, the heating bag for footwear was removed from the outer bag, and the inside of the same athletic shoe as in Example 1 was placed so that the porous membrane side faced up. The heat generating performance of the heat generating bag for footwear was measured in the same manner as in Example 1 by attaching the heat generating bag to the bottom of the toe side. FIG. 4 shows the results.

As a result, the temperature reached 30 ° C. two minutes after the wearing and was comfortable in a stationary state, but reached a maximum of 62 ° C. when walking, and felt very hot and tingling. In addition, even at rest after walking, the temperature dropped to only 50 ° C., which was quite hot. Pain remained in the soles even after the heating bag was removed. In addition, this heat generating bag for footwear had a bias in the heat generating composition when worn and while walking, giving a sense of incongruity. After use, the exothermic composition had solidified.

Comparative Example 2 On the lower surface of a nonwoven fabric having a basis weight of 75 g / m ² and a thickness of 3.0 mm made of 65% cotton and 35% heat-fusible polyester,
A tissue paper having a basis weight of 23 g / m ² is overlaid, and a mixture of 90 parts of iron powder, 8 parts of activated carbon, and 2 parts of a polymer water retention agent is sprayed thereon at a rate of 1500 g / m ² , and vibration is applied thereto. It was held in the voids of the nonwoven fabric. Next, a non-woven fabric having a basis weight of 40 g / m ² and a thickness of 1.9 mm composed of 50% of heat-fusible polyester and 50% of polyester is superimposed on the upper surface of the non-woven fabric, and a basis weight of 23 g / m ² is further placed thereon.
Tissue papers. After that, heating and compression were performed under the same conditions as in Example 1 to form a sheet, cut into a shoe toe shape of 60 mm × 80 mm, and sprayed with a saline solution to obtain a sheet-shaped heating element. This heating element was housed in the same air-permeable bag as in Example 1 to obtain a 3 mm-thick heating bag for footwear.

The heat-generating bag for footwear was further sealed in an air-impermeable outer bag and stored for 2 days, and then the heat-generating bag for footwear was removed from the outer bag. The properties were measured. As a result, a comfortable temperature was obtained both when standing still and when walking, but the entire heat generating bag for footwear was not only hard but also thick and uncomfortable.

[0034]

According to the present invention, a stable temperature can be obtained without being affected by the use condition such as at the time of standing still or walking, and the flexibility is high, and the contents do not shift. No heat-generating bags for footwear are now available.

[Brief description of the drawings]

FIG. 1 is a plan view of a heating bag for footwear.

FIG. 2 is a cross-sectional view of the heating bag for footwear taken along line AA.

FIG. 3 is an example of a manufacturing process of a heating bag for footwear.

FIG. 4 is a diagram showing heat generation characteristics of the heat generation bag for footwear in Example 1 and Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat generating bag for footwear 2 Bag having air permeability 3 Sheet heating element 4 Nonwoven fabric a 5 Nonwoven fabric b 6 Nonwoven fabric c 7 Heat generating composition 8 Adhesive 9 Release paper 10 Roll of nonwoven fabric 11 Roll of nonwoven fabric 12 Water spraying part 13 Roll part 14 Heat-generating composition powder dispersing part 15 Non-woven fabric c roll 16 Roll part 17 Compression part by type compressor 18 Cutting part 19 Water or electrolyte aqueous solution dispersing part 20 Filling part to air-permeable bag

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Minako Suzuki, Inventor 5181 Tamura, Hiratsuka-shi, Kanagawa Prefecture Japan Pionix Co., Ltd.

Claims (5)

[Claims] 1. A nonwoven fabric made of vegetable fibers having a large number of voids is laminated in a plurality of layers, and at least one of the nonwoven fabrics holds a heat-generating composition powder, and is formed into a sheet by the compressive force of a mold compressor and the adhesive force of water. A heat-generating bag for footwear, characterized in that a molded sheet-shaped heat generating element impregnated with water or an aqueous solution of an inorganic electrolyte is housed in a breathable bag. 2. A nonwoven fabric made of vegetable fiber, a nonwoven fabric made of vegetable fiber overlaid on the lower surface of nonwoven fabric, and a nonwoven fabric made of vegetable fiber overlaid on the upper surface of nonwoven fabric. The exothermic composition powder is held between the layers of a and the nonwoven fabric c, and formed into a sheet by the compressive force of a mold compressor and the adhesive force of water. A heating bag for footwear characterized by being stored in a plastic bag. 3. A nonwoven fabric b made of vegetable fiber is superimposed on the lower surface of a nonwoven fabric made of vegetable fiber a having a large number of voids by the adhesive force of water, and the exothermic composition powder is sprayed from the upper surface of the nonwoven fabric a into the void. Holding, then superimposing the nonwoven fabric c made of vegetable fiber on the upper surface of the nonwoven fabric a, compressing it with a mold compressor, and storing the sheet heating element impregnated with water or an aqueous electrolyte solution in a breathable bag. A method for producing a heating bag for footwear. 4. The exothermic bag for footwear according to claim 1, wherein the exothermic composition powder comprises iron powder, activated carbon, or iron powder, activated carbon, or an inorganic electrolyte as a main component. 5. The method for producing a heat generating bag for footwear according to claim 3, wherein the heat generating composition powder is mainly composed of iron powder, activated carbon, or iron powder, activated carbon, or an inorganic electrolyte.