JP2002050459A - Planar heating element and thermal equipment using the same - Google Patents

Abstract

[PROBLEMS] To uniformly and stably form conductive materials for an electrode portion and a heat generating portion, to apply an appropriate voltage to the heat generating portion to obtain a desired heat generating temperature. SOLUTION: A base material 1 made of a flexible textile fiber, and electrode portions 3a and 3b made of an electric conductor material on a surface of the base material 1.
And a heating section 4 having a self-temperature control function electrically connected to the electrode sections 3a and 3b. At least a part of the substrate is provided with an impregnation prevention processing section 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a floor heater, an electric carpet, a tatami-mat heater, a sheet heater for use in a vehicle, etc., and a water heater or a rice cooker having a self-temperature control function. The present invention relates to a planar heating element such as a warmer.

[0002]

2. Description of the Related Art As shown in FIG. 6, for example, a conventional planar heating element includes a substrate 101 and a pair of electrode portions 103a and 103b formed on the substrate 101 with a conductive film having conductivity.
And a heating element 104 having a self-temperature control function and electrically connected to the pair of electrode portions 103a and 101b. 105 is a power supply. Reference numeral 106 denotes a connection portion, which uses eyelets and eyeglass terminals. Reference numeral 107 denotes a connection wire such as a lead wire. Then, current is supplied from the power supply 105 to the electrode units 103a and 103b via the connection lines 107a and 107b and the connection units 106a and 106b. FIG.
FIG. 7 is a sectional view taken along the line P-P of the sheet heating element shown in FIG. 6. As shown in FIG. 7, the current I flows due to the potential difference generated between the electrode portions 103a and 103b, so that the heat generating portion 104 generates heat. The heating element 104 having the self-temperature control function has a characteristic that the temperature of the heating element rises when energized, and when a certain temperature is reached, the resistance value sharply increases to perform self-temperature adjustment.

[0003]

The conventional sheet heating element is formed by printing an ink-like material on a non-impregnated base material such as a PET film by printing an electrode portion formed of a conductive film and a self-temperature control. A heating part having a function was formed. However, floor heating, electric carpet, tatami heating,
In a planar heating element such as an in-vehicle seat heater, the flexibility of the heating element itself is required.
A conventional sheet heating element using an ET film or the like as a substrate could not be used. In particular, as a flexible substrate,
In general, textile fibers are used, but if textiles are used as the base material, ink-like materials may enter the fibrous lattice holes in the base material during printing, or penetrate into the fibers themselves. As a result, the thickness of the conductor film was varied. As a result, in the case of an electrode, the resistance value of the thin film portion locally increases, causing abnormal heat generation, or the resistance value of this portion increases, so that a current cannot be stably supplied to the terminal end portion of the electrode and the voltage is increased. There was a problem of falling. Then, an appropriate voltage cannot be applied to the heat generating part, and the temperature performance of the heat generating part may not be satisfied. Further, there is also a problem that if the thickness of the heat-generating portion varies, the desired heat-generating temperature is not obtained and the temperature distribution becomes non-uniform.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a flexible base material, an electrode portion provided on a surface of the base material, and an electrical connection with the electrode portion. A heating section having a self-temperature control function connected thereto is provided, and at least a part of the base material is provided with an impregnation prevention processing section.

According to the above-mentioned invention, a base material which has been subjected to an impregnation prevention treatment using a printing method in which an electrode portion made of an electric conductor material and a heating portion having a self-temperature control function are formed into a paste and treated as ink. A good and uniform wiring pattern can be formed thereon. That is, since there is no impregnation into the base material, the conductive film forming the electrode portion and the heat generating portion can be formed without varying the thickness as much as possible.

Further, by forming an electrode portion and a heating portion on an impregnation prevention treatment portion provided on a flexible base material, it is possible to prevent an easily bent product such as an electric carpet and a vehicle seat heater. Can also be used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A planar heating element according to the present invention comprises: a base material having flexibility; an electrode portion provided on a surface of the base material;
A heating section electrically connected to the electrode section and having a self-temperature control function is provided, and at least a part of the substrate is provided with an impregnation prevention processing section.

[0008] Since the impregnation prevention treatment section is provided on the base material, the electrode section composed of the conductive film and the heating section having a self-temperature control function are formed into a paste and treated as ink to utilize the printing method. As a result, the wiring pattern can be formed in a uniform state in which variations in film thickness are suppressed.

[0009] Further, an impregnation prevention treatment section is provided on at least a part of both surfaces of the base material.

[0010] These performances can be realized by adding water immersion performance, insulation resistance, abrasion resistance, stain resistance, weather resistance or flame retardancy to the impregnation prevention treatment section.
In addition, since the electrode portion and the heating portion can be formed by printing on both surfaces, both-side heating and one-side heating can be performed. By controlling the energization alternately on one surface, it is possible to provide a planar heating element capable of adjusting the temperature.

Further, an impregnation-preventing treatment section is provided by applying a non-impregnated treatment material to the surface of the base material.

In the method of applying the non-impregnated material, the solution obtained by dissolving the non-impregnated material in a solvent is sprayed, adhered to the base material of the textile fiber, and dried to obtain the fiber. By impregnating the non-impregnated material into the mesh of the lattice or into the fiber, the impregnation-preventing treatment can be easily performed. In addition, when the non-impregnated material is entangled with the textile fiber, the adhesion is improved and the material is not easily peeled.

Further, an impregnation prevention treatment section is provided by laminating a non-impregnation treatment material on the surface of the base material.

[0014] The method of laminating the non-impregnated material can stably form the film thickness of the non-impregnated material compared to the method of coating, and the drying step for removing the solvent in the production process can be shortened. Production efficiency can be improved.

Further, an impregnation prevention treatment section is provided by thermally melting the surface of the base material.

[0016] Then, the surface of the base material is thermally melted by using a heat roller or the like, so that mass production can be stably performed.

Further, an electric insulating layer is provided on the electrode portion and the heat generating portion.

Further, the electrical insulation between the electrode section and the heating section can be made excellent.

Further, the non-impregnated material or the base material is subjected to antistatic treatment.

Further, static electricity caused by friction generated when using a vehicle seat heater, an electric carpet or the like is prevented.

Further, a flexible material is mixed in the electrode portion and the heat generating portion.

Further, even with a stretchable base material such as a textile fiber, the electrode portion and the heat generating portion can follow the base material without disconnection.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing the structure of a sheet heating element according to Embodiment 1 of the present invention. FIG. 2 shows the first embodiment.
It is an external view which shows the structure of the planar heating element. In FIG. 1, reference numeral 1 denotes a case where a textile fiber is used as a flexible base material. An impregnation prevention processing unit 2 is provided on at least a part of the substrate 1. Further, a pair of electrode portions 3a and 3b in the form of a conductor film formed of a conductive material that enables printing such as screen printing is formed on the impregnation prevention processing section 2. Examples of the conductive material for the electrode portion include silver paste and copper paste. Furthermore, a pair of electrode portions 3a, 3
The heat generating portion 4 having a self-temperature control function electrically connected to a part of b. As the heat generating portion 4 having a self-temperature control function, a PTC heater as a heat generating member obtained by mixing conductive particles such as carbon with a resin material is used.
It has the characteristic that the electrical resistance increases with increasing temperature. The PTC heater has a flexible planar shape by a method such as screen printing like the electrode portion. As shown in FIG. 2, power is supplied to the electrodes 3a and 3b from a power source 5 such as a battery. Electrodes 3a, 3b
And power supply 5 are connected to eyelets and eyeglass terminals 6a and 6b.
And they are connected by connection lines 7a and 7b such as lead wires. As a result, a voltage is applied to the electrode portions 3a and 3b. In this way, by providing the impregnation-preventing treatment portion 2 on the surface of the base material 1, even in a fibrous base material such as a textile fiber, ink may enter the woven lattice holes, or the fiber itself may be used. There is no variation in the thickness of the conductor film without penetration. And when forming the conductor film by the printing method,
A uniform film thickness can be obtained.

Next, the operation of this embodiment will be described. As shown in FIG. 1, the heating section 4 having a self-temperature control function is electrically connected to the electrode sections 3a and 3b. By applying a positive power supply potential to the electrode 3a and a negative potential to the electrode 3b by the power supply 5, the current I
Then, the heat flows from a to the electrode 3b through the heat generating portion 4, and the heat generating portion 4 generates heat.

It should be noted that the electrical insulation is provided by the electrode portions 3a, 3b
It is required for the printing surface of the heat generating section 4 and can be realized by mixing an electric insulating material in the impregnation prevention processing section or the like, or by using a base material having electric insulating performance.

In this embodiment, the DC power supply is described as a power supply source. However, if a material having characteristics for an AC power supply is used as a material of the heat generating portion having the self-temperature control function, the power supply source can be changed. It goes without saying that the same effect can be obtained even with an AC power supply.

Also, the wiring pattern of the electrodes and the heat generating part was realized by a printing method having a drying process by treating it as an ink having a conductive material, and mixing the conductive material with a UV curing material. The method of construction can be considered.
As another method, a similar wiring pattern can be formed by, for example, electrostatic coating using a conductive material formed of powder.

The flexible base material may be a woven fabric using warp yarns and weft yarns, a fabric having a pile structure such as bettin, cole, towel, velvet, flat knit, rubber knit, pearl knit. Fabrics such as tuck, float, pile, lace, single denbigh, single bandyed, double denbbie, and double bandyed, or non-woven fabrics in which cotton is driven into the base cloth by needle punching, artificial leather, synthetic Leather, rubber, etc. can be used.

The non-impregnated material may be a polyester resin, urethane resin, fluorine resin, or the like. The material may be laminated so as to fill the mesh of the textile fiber base material, or may be added to the fiber itself. A method of impregnating the ink to prevent the ink from penetrating can be considered. Further, by giving the non-impregnated material itself a heat insulating function, the heat generation efficiency can be increased.

The range in which the base material is subjected to the impregnation prevention treatment is not limited to the entire surface of the base material, but may be a part as long as it can cover the wiring patterns of the electrodes and the heat generating portion. Can be reduced,
Material costs can be reduced.

FIG. 3 shows a specific example. FIG. 3 is a plan view (FIG. 3- (a)) and a cross-sectional view (FIG. 3- (b)) of a case where the sheet heating element of the present invention is used for a vehicle seat heater.

That is, as shown in FIG. 3, an impregnation prevention processing unit 2 is provided on a part of the base material 1, and electrodes 3a, 3b and a heating element 4 are provided on the impregnation prevention processing unit 2. By doing so, a planar heating element is formed, and a plurality of hanging portions 15 when being incorporated into a vehicle seat are extended from the periphery of the base material 1. In this case, since the suspending portion 15 is not subjected to the impregnation prevention treatment, the flexibility of the base material itself is maintained, and the suspension portion hardens due to the impregnation prevention treatment, giving a sense of tension at the time of seating,
Deterioration of workability at the time of hanging work can be prevented. As described above, when the planar heating element is used for a thermal device, the location where the impregnation prevention processing unit is provided can be limited according to the function required for each thermal device.

Examples of the non-impregnated material obtained by laminating a non-impregnated material on the surface of the substrate for impregnation prevention treatment include a nonwoven fabric or the like bonded with a film such as PET, or a resin material such as PP or PE. Substrates laminated on the surface of the substrate are contemplated.

The surface of the substrate is heat-melted to make the surface of the substrate impregnated to prevent impregnation. The material is made of a material such as polyester or acrylic, and the substrate itself is melted by heating and pressure. Thus, it is conceivable that the surface becomes smooth.

Since the impregnation prevention processing section has electrical insulation, the electrode section and the heating section can be brought into a normal energized state without a short circuit.

The antistatic treatment can be performed by applying antistatic treatment to the non-impregnated material or the base material. As a method, a surfactant is mixed with the non-impregnated material to be attached to the fiber surface, or the surfactant alone is attached to the substrate surface to reduce the friction coefficient and generate electricity. There is a method of increasing conductivity by suppressing and reducing the electric resistance.

Further, by providing an electrical insulating layer and a protective layer such as polyester or PET film on the electrode portion and the heat generating portion, it is possible to prevent a short circuit between different electrodes of the electrode portion, or to prevent the electrode portion and the heat generating portion from being short-circuited. The part can be protected from external stress and external environment, such as by improving the abrasion resistance performance, water immersion resistance and peeling performance.

Further, by mixing a flexible material into the electrode portion and the heat-generating portion, even the stretchable base material such as a textile fiber can follow the base material without disconnection of the electrode portion and the heat-generating portion. .

As another method of using the sheet heating element of the present invention, for example, an electric heating device represented by an electric carpet as shown in FIG. 4 can be considered. Reference numeral 8 denotes a heating surface, and a heating portion 4 is provided inside.
It has. An operation unit 9 controls the temperature of the heat generating unit 4 and can adjust the temperature to a desired temperature. A power cord 10 supplies power from an AC power supply or the like. With the above configuration, the user sits on the heat generating surface 8 to heat. Further, it can be used for a warmer as shown in FIG. Numeral 11 denotes a heat generating part, which heats the heat insulating target 12. An outer shell 13 covers and insulates the heat-generating portion 11 and the object to be kept warm 12 and protects it from the outside. 14
Denotes a power cord, which supplies power from an AC power supply or the like.
With the above configuration, the object 12 to be kept warm can be kept warm. Other specific products include electric throws, electric blankets, foot warmers, floor heating, wall heating, tatami floor heating, electric futon, electric cushions, bath heating mats, heating jackets, heating gloves, and heated toilet seats with covers. And an electric heater such as an in-vehicle seat heater or a warmer.

[0041]

As described above, according to the planar heating element of the present invention, by providing an impregnating prevention treatment section on a substrate using a flexible textile fiber, the electrode section and the heating section are formed by a printing method or the like. Even when the portion is formed in a thin film state, it can be formed stably without causing variation in the film thickness of the conductive material as much as possible because the impregnation into the base material is prevented, and floor heating,
It is possible to provide a planar heating element usable in an electric carpet, a tatami floor heating, a sheet heating device used in an in-vehicle seat heater, and a warmer used in a water heater or a rice cooker. In addition, since the variation in film thickness can be suppressed and the electrode section and the heating section having a uniform thickness can be formed, the resistance of the electrode section does not locally increase and does not cause abnormal heating. The current can flow stably, and a non-uniform temperature distribution can be obtained in the heat generating portion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram illustrating a planar heating element according to a first embodiment of the present invention.

FIG. 2 is an external view showing a sheet heating element according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a planar heating element in which a part of a base material is treated as an impregnation prevention treatment part in Example 1 of the present invention.

FIG. 4 is an external view showing an example of an electric heating device which is an applied product using the sheet heating element of the present invention.

FIG. 5 is an external view showing an example of a warmer which is an applied product using the sheet heating element of the present invention.

FIG. 6 is an external view showing the structure of a conventional planar heating element.

FIG. 7 is a sectional view showing the structure of a conventional planar heating element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Impregnation prevention processing part 3a, 3b Electrode part 4 Heat generation part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) H05B 3/20 382 H05B 3/20 382 389 389 (72) Inventor Naohito Asami 1006 Odakadoma, Kazuma, Kadoma, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Norio Abe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Akihiro Maeda 1006 Okadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72 ) Inventor Kazumi Nagayama 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. PP15 PP20 QA05 QB19 QB21 QB31 QC25 QC43 QC49 RF04 RF13 RF14 RF17 RF26 VV03 VV06 VV18 VV22 VV28 3L 072 AA01 AB04 AB10 AC02 AD04 AD13 AE03 AE08

Claims (13)

[Claims] 1. An electronic apparatus comprising: a base material having flexibility; an electrode portion disposed on a surface of the base material; and a heating portion having a self-temperature control function electrically connected to the electrode portion; A planar heating element comprising at least a part of the base material provided with an impregnation prevention treatment part. 2. The planar heating element according to claim 1, wherein the impregnation prevention treatment section is provided on at least a part of both surfaces of the substrate. 3. The sheet heating element according to claim 1, wherein the impregnation prevention treatment section is provided by applying a non-impregnation treatment material. 4. The sheet heating element according to claim 1, wherein the impregnation prevention treatment section is provided by laminating a non-impregnation treatment material. 5. The planar heating element according to claim 1, wherein the impregnation prevention treatment section is provided by thermally melting the surface of the base material. 6. The sheet heating element according to claim 1, wherein the impregnation prevention treatment section also has electric insulation. 7. The sheet heating element according to claim 1, further comprising an electric insulating layer or a protective layer on the electrode section and the heating section. 8. The sheet heating element according to claim 7, wherein at least one of the electric insulating layer and the protective layer is provided with antistatic. 9. The sheet heating element according to claim 3, wherein the non-impregnated material has an antistatic function. 10. The substrate according to claim 1, wherein the substrate has an antistatic function.
10. The sheet heating element according to any one of items 9 to 9. 11. The sheet heating element according to claim 1, wherein a flexible material is mixed in at least one of the electrode portion and the heating portion. 12. The sheet heating element according to claim 11, wherein the flexible material is a urethane resin or a polyester resin. 13. A thermal device having the planar heating element according to claim 1. Description: