JP2000262548A - Sheet-form heating element, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-form heating element wherein a heating composition is held under a stable state, and also, which can be used by cutting into an optional shape or size. SOLUTION: On the upper surface of a sheet-form article 3 comprising paper or a nonwoven fabric having air permeability and water absorbing property, a heating composition 2 in which a resin having a heat-melting property is mixed, and which heats under the existence of air, is held, and on the upper layer, a sheet-form article 1 comprising paper or a nonwoven fabric having air permeability and water absorbing property is superposed, and after they are formed into a sheet-form by a heat-compression by a heat-compressing machine, water or an inorganic electrolyte solution is infiltrated, and the heating composition 2 is held under a stable state, and at the same time, the sheet-form heating element can be used by cutting into an optional shape or size, and the usability is greatly favorable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like heating element which generates heat when it comes into contact with air and which can be used after being cut into an arbitrary shape and size, and a method for producing the same.

[0002]

2. Description of the Related Art As a means for taking warmth, an oxidizable metal such as iron powder is used as a main component, and water, salts, activated carbon acting as a catalyst and a water retention agent are mixed as a reaction aid, and contact with air. A heating element in which a heat-generating composition that generates heat is stored in a breathable bag is widely used as a disposable body warmer.

[0003] The exothermic composition used in the heating element is a bag provided with an appropriate vent hole on its surface (hereinafter referred to as an inner bag).
It is marketed in a state where it is sealed and packaged in a non-breathable film packaging material (hereinafter referred to as an outer bag), and the inner bag is taken out from the outer bag when used. I have.

[0004] Further, these heating elements have the advantage that they do not require ignition and are easy to use, but on the other hand, during use, the heating composition moves in the inner bag due to gravity or the like, causing the body to be biased. Not only did the mountability to the camera significantly deteriorate, causing a sense of incongruity, but also the heat generation performance deteriorated.

[0005] In order to solve these problems, the following publication proposes a heating element in which a heat-generating composition is held or sandwiched on a support or the like and formed into a sheet.

For example, (1) a method in which a heating agent mixed with a non-solvent type adhesive is accommodated in a gas-permeable wrapper and then heated from the outside to adhere to the inner surface of the wrapper (Japanese Patent Publication No. 5-330)
No. 51), (2) A method of impregnating Japanese paper with an oxidation aid, spraying a heat generating agent, and then press-molding (Japanese Utility Model Application Laid-Open No. 64-42).
No. 018), (3) a method in which fibers are irregularly laminated and a heating agent is dispersed and held on a sheet-like support having a large number of fine voids (JP-A-3-152894), (4)
A method of using a nonwoven fabric having a high number of voids mixed with a superabsorbent fiber as a support and having a heating agent held in the voids (Japanese Patent Application Laid-Open No. 7-59809); (5) a nonwoven fabric having a large number of voids and a nonwoven fabric Are laminated with an adhesive, the exothermic agent is sprayed and held on the upper surface, and a nonwoven fabric having a large number of voids is further laminated and thermocompression-bonded (Japanese Patent Laid-Open No. 8-12312).
03 publication).

[0007]

However, the sheet-like heating elements obtained by the methods proposed in these publications have the following problems in production or as heating elements.

(1) A non-solvent type adhesive is mixed in a heating element into a wrapping bag having air permeability, and the heating element impregnated with salt water is housed, and is externally heated and compressed to form a sheet. At this time, since the heating element is impregnated with salt water, a high heating and compression temperature is required, and since the compression is performed, moisture flows out from the air-permeable wrapping surface having fine continuous pores, thereby shortening the heat generation duration. In addition, considering that the inner surface of the non-breathable wrapper is treated with an adhesive or that the heating element is placed in the wrapper and heated and compressed, the cost of materials is higher and the production becomes more complicated. Become. (2) A sheet formed by dispersing a heating element on paper, compressing and holding the sheet, is not practical because the heating element is peeled off or easily broken by bending or vibration. (3) After the fibers are irregularly laminated and the exothermic substance is dispersed and held on a sheet-like support having a large number of voids therein, a suspension such as activated carbon is sprayed, so that the fibers are uniformly mixed. It is difficult to keep. (4) It is difficult to hold a heating element mainly composed of an oxidizable metal powder in a state of being uniformly mixed on a sheet-like support having many voids. In addition, since the superabsorbent fiber is expensive, the unit cost of the material increases. (5) Since the nonwoven fabric having a large number of voids and the nonwoven fabric are overlapped with an adhesive, the voids in the nonwoven fabric are filled, and the air flow becomes poor, so that heat generation becomes difficult. In addition, it is difficult to hold the exothermic compositions having different meshes in the nonwoven fabric having voids at the same mixing ratio by vibration or suction under reduced pressure, and it is difficult to obtain uniform heat generation. In addition, there is a step of laminating the nonwoven fabric with an adhesive, so that the cost of the material is high, and the production is complicated.

[0009] The present invention has been made to solve such a conventional problem, in which the exothermic composition is maintained uniformly,
It is another object of the present invention to provide a sheet-like heating element that can be used after being cut into an arbitrary shape and size, and a method for manufacturing the same.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a resin having thermal fusibility is mixed with an upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorbency. After holding the heat-generating composition that generates heat in the presence of air, and overlying a sheet-like material made of paper or nonwoven fabric having air permeability and water absorbability on the upper layer, and forming the sheet into a sheet by heating and compression of a heating compressor, It is characterized by being impregnated with water or an aqueous solution of an inorganic electrolyte.

[0011] In order to achieve the above object, the invention according to claim 2 is characterized in that, in the presence of air in which a heat-meltable resin is mixed on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorption. Holding the exothermic composition that generates heat, non-breathable and non-water-absorbing paper on the upper layer, after forming a sheet-like material made of non-woven fabric or resin film by heating and compressing with a heating compressor, and then forming the sheet, It is characterized by being impregnated with water or an aqueous inorganic electrolyte solution from the viewpoint of air permeability and water absorption.

In order to achieve the above object, the invention according to claim 3 is characterized in that the exothermic composition comprises reduced iron powder, activated carbon or reduced iron powder,
It is characterized in that a resin having a heat melting property is mixed in order to form a mixed powder of the exothermic composition into a sheet-like molded body, mainly comprising activated carbon and a water retention agent.

In order to achieve the above object, the invention according to claim 4 is characterized in that a mixed powder of a heat-generating composition that generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of a sheet-like material, A sheet-like material made of paper or nonwoven fabric having air permeability and water absorbency is superimposed on the upper layer, and the porosity of the sheet-like heating element formed into a sheet by heating and compression by a heating compressor is 30 to 85%, and the thickness is 30%. 0.2 to 10 mm.

According to a fifth aspect of the present invention, a mixed powder of a heat-generating composition which generates heat in the presence of air mixed with a resin having a thermal melting property is held on the upper surface of a sheet-like material. A sheet-like material made of paper or nonwoven fabric having air permeability and water absorbency is superimposed on the upper layer, and the air-permeability of the sheet-like heating element formed into a sheet by heating and compression of a heating compressor is 0 according to the test method of JIS S-8117. .1 to 20 sec
/ 100 ml.

In order to achieve the above object, the invention according to claim 6 is characterized in that a sheet made of paper and nonwoven fabric having air permeability, water permeability and water absorption has a water absorption of 0.3 to 10 g / 10 cm.
² , the thickness is 10 to 2000 μm, the basis weight for paper is 5 to 600 g / m ² , and the basis weight for nonwoven fabric is 5 to 80
0 g / m ² .

[0016] In order to achieve the above object, the invention according to claim 7 is characterized in that a resin having a heat melting property to be mixed with the exothermic composition comprises:
A thermoplastic resin powder selected from a polyamide powder, a polyester powder, a polyethylene powder, an ethylene-vinyl acetate copolymer powder (EVA), and a polyurethane powder, wherein at least one kind is a main component, and 100 parts of an exothermic composition The amount of addition is 3 to 30 parts.

According to an eighth aspect of the present invention, there is provided a sheet-shaped heating element according to the first or second aspect.
For 0 parts, the impregnation amount of water or the aqueous solution of inorganic electrolyte is 1
The addition amount is 0 to 50 parts.

In order to achieve the above object, the invention according to the ninth aspect of the present invention is to provide a sheet-like material made of paper or nonwoven fabric having air permeability and water absorbency in the presence of air mixed with a resin having a heat melting property. Holding the exothermic composition that generates heat, after superimposing a sheet made of paper or nonwoven fabric having air permeability and water absorbency on the upper layer and forming it into a sheet by heating and compression of a heating compressor, water or an aqueous inorganic electrolyte solution is added. It is characterized by being impregnated.

In order to achieve the above object, the invention according to claim 10 is to provide a sheet-like material made of paper or nonwoven fabric having air permeability and water absorbability in the presence of air in which a resin having a heat melting property is mixed on the upper surface. The exothermic composition that generates heat is held, and non-breathable, non-water-absorbing paper, nonwoven fabric or resin film, etc. are stacked on the upper layer and formed into a sheet by heating and compression of a pressure compressor. Water or an inorganic electrolyte aqueous solution is impregnated from the surface of a sheet made of paper or nonwoven fabric having a property.

In order to achieve the above object, the invention according to claim 11 provides a heat-generating composition containing the resin having the heat-fusibility described in claim 3 in the form of a sheet made of paper or nonwoven fabric by a scattering method. It is characterized by being sprayed on objects.

[0021] In order to achieve the above object, the invention according to claim 12 is characterized in that the pressure of the compressor is set to 0.
1-10.0 kg / cm ² , temperature range 70-250 ° C
It is characterized by being.

According to a thirteenth aspect of the present invention, in order to achieve the above object, a heat generating composition containing a resin having a heat melting property is mixed by a method of a powder mixing apparatus (such as a tumbler). And

[0023]

Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the sheet-like heating element of the present invention is a sheet-like heating element in which a hot-melt resin having a hot-melt property is mixed on the upper surface of a sheet 1 made of paper or nonwoven fabric having air permeability, water permeability, and water absorption. The composition 2 is uniformly dispersed and held, and a sheet 3 made of paper or nonwoven fabric having air permeability, water permeability, and water absorbency is layered thereon, heated and compressed to form a sheet, and then water or an aqueous inorganic electrolytic solution is applied. The following materials are used as the sheet-like materials 1 and 3 for holding the heat generating composition 2 from above and below.

The material used for the sheets 1 and 3 having air permeability, water permeability and water absorption is paper, non-woven fabric or the like made of plant fiber, synthetic fiber, or a mixture of both, especially water retention. Those containing plant fiber having excellent ability as a main component are preferred, and those containing pulp, hemp, cotton and the like as components are particularly preferred. The paper or nonwoven fabric needs to have appropriate air permeability, water permeability, and water absorbability due to heat generation. Preferably, in the case of paper, the thickness is 10 to 2000.
μm, water absorption 0.3 to 10 g / 10 cm ² , basis weight 5
６００600 g / m ² , in the case of a nonwoven fabric, the thickness is 10１０〜20
It has a water absorption of 0.3 to 10 g / 10 cm ² and a basis weight of 5 to 800 g / m ² . Outside the above range, the obtained sheet-like materials 1 and 3 do not have sufficient air permeability, or have poor water-holding power, resulting in a decrease in heat generation.

Sheets 1 and 3 sandwiching exothermic composition 2
One of the upper and lower sides is non-breathable, non-absorbent paper,
Non-woven fabric or resin film may be used. The thickness of non-breathable, non-water-absorbing paper, nonwoven fabric, resin film, or the like is preferably 10 to 2000 μm. When the sheet materials 1 and 3 are paper or non-woven fabric, if the thickness is further thinner, the exothermic composition 2 is spilled or insufficient strength occurs at the time of production of a molded sheet. Cannot be obtained. If the thickness is too large, appropriate heat is not applied to the exothermic composition mixed with the hot melt resin. In addition, problems such as impairing the flexibility of the obtained molded sheet occur.

On the other hand, the exothermic composition 2 is composed mainly of oxidizable metal powder such as pure iron powder, reduced iron powder, electrolytic iron powder, aluminum powder, nickel powder, etc., and is composed of water, sodium chloride, calcium chloride and activated carbon. And a water retention agent such as wood flour, diatomaceous earth, zeolite, hillite, vermiculite, activated clay, and a polymer water-absorbing resin.

Further, in order to bond the exothermic composition 2 to a sheet, a resin having a heat melting property, for example, a polyamide powder, a polyester powder, a polyethylene powder, an ethylene vinyl acetate copolymer powder (EVA), a polyurethane powder, A thermoplastic resin powder selected from polyvinyl alcohol or the like is mixed with at least one kind as a main component.
The mixing ratio is 3 to 30 parts with respect to 100 parts of the exothermic composition. Sheet-like molding itself with a small amount of added thermoplastic resin cannot be performed, and when the added amount is large, the air permeability and water permeability of the molded sheet are significantly impaired.

Next, a method for manufacturing the above-mentioned sheet heating element will be described. Scattering mixed powder of heat-generating composition 2 that generates heat in the presence of air mixed with hot-melt resin having hot-melt properties on the upper surface of sheet 1 made of paper or nonwoven fabric having air permeability, water permeability, and water absorption The sheet material 3 made of paper or non-woven fabric having air permeability and water absorbency is superposed thereon, and is heated and compressed by a heating compressor to form a molded sheet.

At the time of molding, when the pressure of the heating compressor is low, the bonding force of the exothermic composition 2 is weak, and sheet-like molding cannot be performed. When the pressure is high, the air permeability of the molded sheet, Water permeability and water absorption are impaired. In the case of heating, if the temperature is low, the added thermoplastic resin does not melt and cannot be molded. When the temperature is high, the thermoplastic resin covers the exothermic composition 2 and impairs air permeability, water permeability, and water permeability. Therefore, the molding conditions are such that the pressure is 0.
1-10.0 kg / cm ² , temperature range 70-250 ° C
It is desirable to be between.

The molded sheet-shaped heating element has an air permeability of J
0.1 to 20 sec / 100 according to IS-8117 test method
ml, porosity 30-85%, thickness 0.2-10mm
It is. The porosity was measured and calculated as follows. The sheet-like heating element is immersed in an aliphatic saturated hydrocarbon, placed in a desiccator, and substantially evacuated.
Keep under vacuum until no air bubbles emerge from the sheet.
When no more air bubbles come out, return to atmospheric pressure. At this time, the weight increase of the sheet heating element is measured, and the porosity is calculated by the following equation. Porosity = weight increase of sheet heating element / specific gravity of aliphatic saturated hydrocarbon × 100 / volume of sheet heating element

The sheet-like heating element obtained by the above method is
It is cut into an arbitrary shape according to the purpose of use, impregnated with water or an aqueous inorganic electrolyte solution, and at least partially accommodated in a packaging material having air permeability. The packaging material used has one side in contact with the body part made non-breathable and the other side facing it made breathable. The packaging material used for the non-breathable wrapping part is a non-breathable sheet such as a heat-sealing resin sheet, or a multilayer sheet having a heat-sealing resin sheet as an inner layer. .

Polyethylene film / nylon non-woven fabric,
It is a laminated film such as polyethylene film / synthetic paper, polyethylene film / foamed polyethylene sheet, polyethylene film / polyester nonwoven fabric. The packaging material used for the air-permeable wrapping part has heat sealing properties and air permeability,
Those having flexibility and heat retention are good. For example, a nonwoven fabric, a microporous sheet, a laminated film of a microporous sheet and a nonwoven fabric, or a perforated resin sheet subjected to a perforation process or the like.

The heating temperature and pattern of the sheet-like heating element obtained by the above method depend on the thickness of the sheet-like heating element, the amount of impregnation with water or an aqueous solution of an inorganic electrolyte, the configuration of the packaging material surrounding the sheet-like heating element, and the like. Can be set arbitrarily. Therefore, this sheet-shaped heating element can be used in various ways. For example, a heat source for efficiently evaporating a volatile transpiration substance (an insecticide, a fragrance, a deodorant, etc.) impregnated in a disposable body warmer, paper, nonwoven fabric, or the like can be considered.

(Embodiment) An embodiment of the present invention will be described below. However, the present invention is not limited to the following embodiments. In addition,% represents weight% and part represents weight part. (Example 1) 60 parts of iron powder, 15 parts of activated carbon, 18 parts of diatomaceous earth, and low-density polyethylene powder 7 on paper having a basis weight of 25 g / m ²
Part of the heating element composition obtained by mixing
Spraying was performed by a scattering method in the range of m ^{2 to} 10,000 g / m ² . Further, the top surface has a basis weight of 25 g / m ²
Of paper, and at a temperature of 70 to 200
Heat compression is performed at a temperature of 0.1 ° C. and a pressure of 0.1 to 10.0 kg / cm ² to obtain an arbitrary sheet. The thickness of the obtained sheet was measured, and the presence or absence of heat generation was confirmed by adding an inorganic electrolyte aqueous solution. Table 1 shows the results.

[0035]

[Table 1]

Example 2 A heating element composition was prepared by mixing 60 parts of iron powder, 15 parts of activated carbon, 18 parts of diatomaceous earth, and 7 parts of low-density polyethylene powder on a paper having a basis weight of 25 g / m ² by a powder mixing apparatus. Sprayed by the scattering method. Further, a paper having a basis weight of 25 g / m ² is placed on the upper surface, and in accordance with each application amount,
Temperature 70-200 ° C, pressure 0.1-10.0kg / cm
Heat compression was performed in the range of ² to obtain an arbitrary sheet. The air permeability of the obtained sheet was measured, and the presence or absence of heat generation was confirmed by adding an aqueous inorganic electrolyte solution. Table 2 shows the results.

[0037]

[Table 2]

[0038] (Example 3) 60 parts of iron powder on the paper having a basis weight of 25 g / ^{m 2,} 15 parts of active carbon, the composition obtained by mixing 18 parts of diatomaceous earth, the mixing ratio of the low density polyethylene powder 2
The heating element composition obtained by mixing them in a powder mixing apparatus so as to be 50 parts was sprayed by a scattering method. Further, a paper having a basis weight of 25 g / m ² is placed on the upper surface, and the temperature is adjusted to 7 so that a molded sheet can be obtained according to each spraying amount.
Heat compression was performed at 0 to 200 ° C. and a pressure of 0.1 to 10.0 kg / cm ² . An aqueous inorganic electrolyte solution was added to the obtained sheet to check for heat generation. Table 3 shows the results.
Shown in

[0039]

[Table 3]

Example 4 A heating element composition was prepared by mixing 59 parts of iron powder, 14 parts of activated carbon, 18 parts of diatomaceous earth, and 9 parts of low-density polyethylene powder on a paper having a basis weight of 25 g / m ² using a powder mixing apparatus. It was sprayed by a scattering method so as to be 2700 g / m ² . Further, a paper having a basis weight of 25 g / m ² was placed on the upper surface, and heated and compressed at a temperature of 200 ° C. and a pressure of 1 kg / cm ² to obtain a molded sheet. Then, the molded sheet was cut into 8 cm × 11 cm, and 6 g of saline mixed with 15 parts of salt and 85 parts of water was sprayed to obtain a heat generating sheet. This heat generating sheet was housed in an inner bag composed of a composite sheet of a porous film made of polypropylene and a nylon non-woven fabric on one side and a polyethylene film on one side to obtain a sheet-like heating element. This was sealed in a non-breathable outer bag and stored at room temperature for 3 days. Three days later, it was taken out of the outer bag and subjected to an exothermic test by an exothermic test method based on JIS S-4100. The result is shown in FIG. As a result of the exothermic test, the temperature exceeded 40 ° C in 8 minutes and the maximum temperature was 5
5 ° C. was reached. The time for maintaining the temperature at 40 ° C. or more was about 11 hours. When this sheet-shaped heating element was actually used for a human body, a favorable temperature was maintained for about 10 hours without unevenness of the heating composition and the flexibility was maintained during that time.

Example 5 59 parts of iron powder, 14 parts of activated carbon, 18 parts of diatomaceous earth, low-density polyethylene powder on the upper surface of a paper (basis weight: 25 g / m ² , thickness: 130 μm) having air permeability and water absorbency The exothermic composition obtained by mixing 9 parts with a powder mixing apparatus is uniformly dispersed and laminated by a scattering method, and a paper (basis weight: 25 g / m ² , thickness: 130 μm) having air permeability and water absorption is formed on the upper layer. It was heated and compressed by a superposition heating compressor to form a sheet. Thus, a sheet-like heating element having a thickness of about 1.0 mm was obtained. This sheet heating element is 110m long
cut into mx 80 mm width, aqueous inorganic electrolyte solution (7 g)
, And one side facing the non-breathable sheet having heat sealability is permeable to one side having heat sheet properties (air permeability is 450 according to the test method of JIS S-8117).
(sec / 100 ml).
The upper part of the non-breathable sheet surface of the wrapper containing the sheet heating element
0 mm × 60 mm wide paper (basis weight: 20 g / m ² , thickness:
50 μm) is impregnated with 30 mg of a highly volatile pyrethroid compound, 1-ethynyl-2-methyl-2-pentenyl-cis / trans-chrysanthemate (hereinafter referred to as empentrin), and is applied to the air-impermeable sheet surface of the above-mentioned wrapper. Fixed. A control was prepared by adding an inorganic electrolyte aqueous solution (7 g) to a powder (21 g) in which iron powder, a water retention agent, and an oxidizing aid were mixed in the same ratio, and then mixing the resulting powder into a bag similar to the prototype. It was used to measure the transpiration of both empentrins. Table 4 and FIG. 2 show the results of comparison and comparison of the case using the conventional body warmer. After the evaporating vapor of empentrin was trapped for a certain period of time in a silica gel packed column for a predetermined time, it was extracted with acetone and measured and analyzed by gas chromatogram.

[0042]

[Table 4]

[0043]

As described in detail above, the present invention provides a heat-generating composition that generates heat in the presence of a resin having a heat-fusing property and air on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorption. The mixture is mixed and uniformly dispersed and held, and a sheet made of paper or nonwoven fabric having air permeability and water absorbency is overlaid on the upper layer, and the sheet is formed into a sheet by heating and compression of a heating compressor. Is impregnated, and at least a part of the exothermic composition is housed in a wrapper having air permeability, so that the surface of the exothermic composition has high voids without being completely covered with a resin having a heat-melting property. Since the composition easily reacts with air, heat can be generated in a short time during use, and the composition can be cut into an arbitrary shape and size, so that a variety of products can be produced.

Further, since a flexible sheet is obtained by impregnating with water or an aqueous solution of an inorganic electrolyte, a sheet-like heating element free from incongruity during use can be obtained. No heat-absorbing paper or nonwoven fabric is required, and even if one side is made of a non-breathable sheet, uniform heat generation can be obtained during use.

Further, when the exothermic composition is impregnated with a large amount of water or an aqueous solution of an inorganic electrolyte, the air permeability in the sheet deteriorates and the heat generation deteriorates. However, by impregnating and holding paper or nonwoven fabric having air permeability and water absorbency. Since the air permeability of the sheet can be ensured, heat generation can be maintained for a long time.

In addition, it is possible to form a sheet from a thin to a thick one, and it is possible to continuously form a wide plate, and it is not necessary to add a heat-generating auxiliary agent such as water during the production. Since it can be manufactured and stored even below, it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sheet heating element according to an embodiment of the present invention.

FIG. 2 is a diagram showing a heat generation test result of the sheet heating element according to the embodiment of the present invention.

FIG. 3 is a diagram showing the amount of evaporation of a sheet heating element according to an embodiment of the present invention and a conventional body warmer.

[Explanation of symbols]

 1,3: sheet-like material, 2: heat-generating composition.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shoji Yamamoto 270 Taga-machi, Taga-cho, Inukami-gun, Shiga Prefecture Inside the Shiga Plant of Dynic Co., Ltd. Inside Shiga Plant Co., Ltd. (72) Inventor Takamasa Muramoto 4-22-8, Ajinai, Hatsukaichi, Hiroshima Prefecture (72) Michihiko Matsumori 28-13-6, Yawatahigashi 2-13-6 F Term, Saeki-ku, Hiroshima, Hiroshima Prefecture reference) 4C099 AA01 CA19 EA09 GA01 GA02 GA03 JA04 LA14 LA15 LA30 4F100 AA01A AA01C AA01H AA37B AB02B AC10B AK01B AK04D AK06B AK41B AK41C AK46B AK48C AK51B AK68B BA03 BA04 BA07 BA10D BA13 CA30B DE01B DG10A DG10C DG15A DG15C EC052 EH761 EJ192 EJ422 EJ82A EJ82C EJ822 GB90 JA13A JA13C JA20 JA20A JA20C JB16B JD02 JD02A JD02C JD15A JD15C JL01 JL02 JL05 YY00 YY00A YY00C

Claims (13)

[Claims] An exothermic composition which generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorbability,
A sheet formed by laminating a sheet made of paper or nonwoven fabric having air permeability and water absorbency on the upper layer and forming the sheet into a sheet by heating and compression of a heating compressor, and then impregnated with water or an aqueous solution of an inorganic electrolyte. Heating element. 2. A heat-generating composition which generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorbency,
Non-breathable, non-water-absorbing paper, non-woven fabric or resin film, etc. are superimposed on the upper layer and formed into a sheet by heating and compression of a heating compressor. A sheet-shaped heating element impregnated with water or an inorganic electrolyte aqueous solution. 3. A resin having a heat melting property in which the exothermic composition is mainly composed of reduced iron powder, activated carbon or reduced iron powder, activated carbon, and a water retention agent, and a mixed powder of the exothermic composition is formed into a sheet-like molded body. 3. A sheet-like heating element according to claim 1, wherein said sheet-like heating element is mixed. 4. A mixed powder of a heat-generating composition that generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of the sheet-like material, and paper or air-permeable and water-absorbent is formed on the upper layer thereof. The porosity of the sheet-like heating element formed by laminating sheet-like materials made of non-woven fabric by heating and compression of a heating compressor is 30 to 85%, and the thickness is 0.2 to 10 mm. The sheet heating element according to claim 1. 5. A paper or nonwoven fabric having a heat-generating composition which generates heat in the presence of air mixed with a resin having a heat-melting property on the upper surface of a sheet-like material, and having a gas-permeable and water-absorbing layer on its upper layer. A sheet-like heating element formed by laminating sheet-like objects formed by heating and compression of a heating compressor has a permeability of 0.1 to 2 according to the test method of JIS S-8117.
2. The pressure is 0 sec / 100 ml.
Or the sheet heating element according to 2. 6. A sheet made of paper and nonwoven fabric having air permeability, water permeability, and water absorbency has a water absorption of 0.3 to 10 g /.
10 cm ² , 10 to 2000 μm in thickness, 5 to 600 g / m ² in the case of paper, and 5 in the case of non-woven fabric
The sheet-shaped heating element according to claim 1 or ² , wherein the weight is from 800 to 800 g / m2. 7. The heat-meltable resin to be mixed with the heat-generating composition is polyamide powder, polyester powder, polyethylene powder, ethylene-vinyl acetate copolymer powder (EV).
A), characterized in that at least one kind of thermoplastic resin powder selected from polyurethane powder and the like is a main component, and the addition amount is 3 to 30 parts with respect to 100 parts of the heat generating composition. 2. The sheet heating element according to 2. 8. The sheet-shaped heating element according to claim 1, wherein the amount of impregnation of water or the aqueous inorganic electrolyte solution is 10 to 50 parts per 100 parts of the sheet-shaped heating element. 9. A heat-generating composition which generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorbency,
A sheet formed by laminating a sheet made of paper or nonwoven fabric having air permeability and water absorbency on the upper layer and forming the sheet into a sheet by heating and compression of a heating compressor, and then impregnated with water or an aqueous solution of an inorganic electrolyte. For producing a cylindrical heating element. 10. A heat-generating composition that generates heat in the presence of air mixed with a resin having a heat-melting property is held on the upper surface of a sheet made of paper or nonwoven fabric having air permeability and water absorbability, Non-breathable and non-water-absorbent paper, non-woven fabric or resin film, etc. are laminated and formed into a sheet by heating and compression of a pressure compressor, and then a sheet-like material surface made of breathable and water-absorbent paper or non-woven fabric A method for producing a sheet-like heating element, characterized by impregnating with water or an aqueous solution of an inorganic electrolyte. 11. The sheet according to claim 9, wherein the exothermic composition mixed with a resin having a heat-melting property is scattered on a sheet made of paper or nonwoven fabric by a scattering method. Heating element manufacturing method. 12. The pressure of the compressor is 0.1 to 10.0 kg / cm ² and the temperature range is 70 to
The method according to claim 9, wherein the temperature is 250 ° C. 11. 13. The sheet-like heat generation according to claim 9, wherein the heat-generating composition mixed with a resin having a heat-melting property is mixed by a method of a powder mixing device (such as a tumbler). How to make the body.