JPS63274083A - Face-shaped heating body - Google Patents

Abstract

PURPOSE:To obtain the temperature self-adjusting function and overheat preventing function and maintain flexibility by arranging PTC layers on at least part of the peripheries of electrodes in contact with conductive elastomer layers formed on at least one face of a cloth substrate and containing a conductive raw material. CONSTITUTION:A cloth substrate 11, conductive elastomer layers 12, 13 formed on at least one face of the cloth substrate 11, electrodes 14, 15 arranged on the conductive elastomer layers 12, 13 and connected to a power supply, and polymer conductive material layers (PTC layers) 14A, 15A arranged on at least part of the peripheries of the electrodes 14, 15 are provided. The temperature self-adjusting function and overheat preventing function are thereby obtained without additionally arranging a temperature adjusting member such as a bimetal, and flexibility can be maintained.

Description

Detailed Description of the Invention (1) Purpose of the Invention [Field of Industrial Application] The present invention relates to a planar heating element, and particularly to a planar heating element having a self-temperature regulator and an overheating prevention function. It is.

[Prior Art] Conventionally, this type of sheet heating element has been made by dispersing conductive particles such as carbon black or metal particles into a crystalline polymer having a positive temperature coefficient of electrical resistance, or by dispersing conductive particles such as carbon black or metal particles into an elastomer. On the other hand, it has been proposed to disperse conductive particles such as carbon black or metal particles and incorporate a temperature regulating member such as bimetal.

[Problems to be solved] However, in conventional planar heating elements, (i) those that disperse conductive particles in crystalline polymers had high hardness and were not easy to fold; Furthermore, it is difficult to arrange it in a place with a small radius of curvature, and it requires a large space for storage. Since it was necessary to incorporate temperature control members such as bimetals, the number of parts increased, and even if it was flexible, it was difficult to install it in a place with a small radius of curvature, and it also required a large space for storage. It had the disadvantage of requiring

Therefore, in order to eliminate these drawbacks, the present invention has developed a planar heat generating device that has sufficient flexibility and has self-temperature control and heat prevention functions without the need for additional parts such as bimetal. He wants to donate his body.

(2) Structure of the Invention [Means for Solving Problems] The solution provided by the present invention consists of the following: (a) a cloth base material; (b) a conductive material formed on at least one surface of the cloth base material; (c) an electrode disposed on the conductive elastomer layer and connected to a power source; (d) an electrode in contact with the conductive elastomer layer; and a PTC layer disposed on at least a portion of the circumferential surface.

Another solution provided by the present invention is “(a)
a cloth base material; (b) a conductive elastomer layer formed on at least one surface of the cloth base material and containing a conductive material; and (c) a power source disposed on the conductive elastomer layer. (d) a PTC layer disposed on at least a portion of the circumferential surface of the electrode in contact with the conductive elastomer layer.

(e) a sheet heating element comprising: the cloth base material and an insulating layer disposed on the surface of the conductive elastomer layer.

[Function] The planar heating element according to the present invention has PTC on at least a part of the circumferential surface of the electrode that is formed on at least one surface of the cloth base material and contacts the conductive elastomer layer containing the conductive material. Because it is made of layers, it achieves self-temperature control and overheat prevention functions without the need for additional temperature control members such as bimetals, and maintains flexibility. Therefore, it can be installed in a place with a small radius of curvature, and the space required for storage can be reduced.

Further, in another sheet heating element according to the present invention, at least a portion of the circumferential surface of an electrode that is formed on at least one surface of a cloth base material and that contacts a conductive elastomer layer that includes a conductive material is coated with PTC. Since an insulating layer is provided on the surface of the cloth base material and the conductive elastomer layer, it has the function or flexibility to achieve the above-mentioned self-temperature control function and overheat prevention function. In addition to maintaining a small radius of curvature and reducing storage space, it also prevents electrical leakage to surrounding members.

[Example] Next, the present invention will be specifically described with reference to Examples.

FIG. 1 is an external perspective view showing an embodiment of a sheet heating element according to the present invention.

FIG. 2(a) is a sectional view taken along the line n, -n of the embodiment in FIG.

FIG. 2(b) shows a second [J
It is a sectional view corresponding to (a).

FIG. 3 is an external perspective view showing another embodiment of the sheet heating element according to the present invention.

FIG. 4 is a sectional view taken along the line IV--IV of the embodiment of FIG.

FIG. 5 is an external perspective view showing another embodiment of the sheet heating element according to the present invention.

FIG. 6 is a sectional view taken along the line vt-vt of the embodiment shown in FIG.

t57 Figures (a) to (d) are explanatory diagrams of the operation of the embodiment in Figure 1, respectively.

First, the structure and operation of the first embodiment of the present invention shown in FIGS. 1 and 2 will be described in detail.

The heating element is a planar heating element of the present invention, in which conductive elastomers ffj12 and 13 are formed on both sides of a cloth base material 11, respectively.

Further, one of the conductive elastomer layers 12 and 13, for example, an electrode 14 is provided on the conductive elastomer layer 12 at a distance from each other.
．． Is is arranged. The electrode 14.15 has a temperature control layer, that is, a conductive polymer whose temperature coefficient of electrical resistance is positive, for the portion of its circumferential surface that contacts the conductive elastomer layer (here, the conductive elastomer layer 12). Material layer (
PTC layers (hereinafter abbreviated as "PTC layers") 14 and 15A are disposed to suppress the amount of heat generated by increasing the electrical resistance between the electrodes 14 and 15 in a high temperature state. PTC layer 14A,
15A need not be disposed over the entire contact surface between electrode 14.15 and conductive elastomer layer 12.
Also, if desired, one of PT CWj14^ and PT CWj15A may be removed. The planar heating element is provided with an insulating layer 16 as a surface layer, such as an insulating polymer film layer 16 such as a vinyl chloride sheet, but this may be removed depending on the application. That is, the cloth base material 11. An insulating layer 16 is provided on the surfaces of the conductive elastomer layers 12 and 13 and the electrodes 14 and 15 to avoid direct contact with surrounding members, but depending on the use of the sheet heating element, There is no need to consider contact with surrounding members, and there is no risk of electric shock when the voltage applied to the sheet heating element is low, so it may be removed. (not shown).

The cloth base material 11 is formed of a woven fabric (plain woven fabric or knitted woven fabric) or a nonwoven fabric of synthetic fibers (for example, nylon or Tetron). Cloth base material 11
It is preferable that the wall thickness is usually 50 ILm to 1 mm, but it is not limited to this.

The conductive elastomer layer 12.13 is formed as follows. namely conductive materials and rubber compounding agents (i.e. vulcanizing agents as essential ingredients and reinforcing fillers, plasticizers, vulcanization accelerators, vulcanization oil conditioning agents, processing aids, anti-aging agents and flame retardants as optional ingredients). kneading a() into the elastomer.
For example, a conductive elastomer is dispersed and mixed using a roller) to create a conductive elastomer.Next, the conductive elastomer is melted in an appropriate solvent (for example, toluene, methyl ethyl ketone, or a mixture thereof) to form a conductive elastomer solution, and then a cloth base material 11 is prepared. While moving, the coating is coated on both sides using a doctor knife type roll coater (not shown) or the like, and then passed through a drying oven (not shown) to dry. The thickness of the conductive elastomer coating on the cloth base material 11 is determined by the concentration of the conductive elastomer solution, the moving speed of the S base material 11, the spacing between the doctor knives, etc., and is usually 0.02 to 0.06 thick. 1/time. The basis for this is that (i) the coating film thickness of the conductive elastomer is 0.02cm/
(ii) If the thickness of the conductive elastomer coating exceeds 0.06 m5/time, it will be necessary to apply multiple times to achieve the desired thickness, resulting in poor coating efficiency.
This is because the volatilization of the solvent is inhibited and a large number of voids are formed in the conductive elastomer layer 12 and 13 due to foaming. Preferably, those that do not deteriorate due to air oxidation, that is, those that do not contain many unsaturated groups,
For example, at least one of rubbers such as ethylene propylene rubber, acrylic rubber, silicone rubber, fluororubber, butyl rubber, chlorinated polyethylene, or D
It is preferable to use at least one of resins such as polyvinyl chloride and SL aliphatic polyamide containing a plasticizer such as OP.

The conductive material is added to the elastomer in order to adjust the electrical resistance and appropriately set the amount of heat generated and the temperature of the heat generated. Conductive materials include particulate materials or fibrous materials. Examples of particulate materials include Ketjen black, acetylene black, ECF carbon black,
At least one material selected from carbon black materials such as graphite or carbon fiber, or nickel powder, copper powder, silver powder, gold powder, aluminum powder, brass powder, or metal-coated cloud fi] powder.

It is preferable to use at least one material selected from metal-based materials such as metal-coated glass powder. The carbon black material is preferably added in an amount of 5 to 50% by weight of the elastomer, and the metal material is preferably added in an amount of 10 to 90% by weight of the elastomer. Also, if desired, a carbon black material and a metal material may be used in combination.
In this case, the amount of each addition is appropriately selected depending on the requirements for the weight and conductivity of the planar heat generating material of the present invention. On the other hand, as a fibrous material.

Carbon fiber, metal coated polymer fiber, metal coated glass fiber or metal fiber! 1 (for example, aluminum fiber, brass fiber, nickel fiber), etc. are suitable. The amount of fibrous material added is 10 to 10 times the amount of elastomer added.
Preferably it is 90% by weight.

Reinforcing fillers include, for example, white carbon, precipitated calcium carbonate, finely powdered mica 9 synthetic edge,! l
It is preferred to use at least one of short fibers (eg nylon or tetron), whiskers and hard clay.

As vulcanizing agent, it is suitable to use, for example, a vulcanizer or a peroxide. Here, as the peroxide, at least one of dicumyl peroxide, tert-butyl cumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hetyline, etc. is used. If desired, at least one of ethylene dimethacrylate, trimethylolpropane trimethacrylate, or a polyaryl compound (eg, triarylisocyanurate) may be used in combination.

When sulfur is used as a vulcanizing agent, at least one of benzothiazoles (for example, 2-mercaptobenzothiazole), dithiocarbamates, and thiurams (for example, tetramethylthiuram monosulfide) is used as the vulcanizing agent. It is preferable to use one. It is preferable to add a vulcanization accelerator (for example, zinc white, etc.) together with the vulcanization accelerator, since the vulcanization accelerator is sufficiently destroyed.

As the anti-aging agent, it is preferable to use, for example, at least one of N,N'-diphenyl-P-phenylenediamine, P-isopropoxydiphenylamine, and N,N'-di-0-tolylethylenediamine. .

Flame retardants, together with anti-aging agents, function to ensure product lifespan and safety. The flame retardant includes an organic phosphorus compound (for example, at least one of tricresyl phosphate, diphenyl cresyl phosphate, trioctyl phosphate, triphenyl phosphate, or tris(chloroethyl) phosphate); A halogen compound (for example, at least one of hexabromobiphenyl, pentabromochlorocyclohexane, or tris-(2,3-dibromopropyl-1)-isocyanurate) and a total oxide (for example, antimony oxide) It is preferable to use at least one selected from the group consisting of , metal hydroxides (for example, at least one of aluminum hydroxide, zinc borate, etc.).

As a processing aid, it is preferable to use stearic acid or the like.

The electrodes 14 and 15 are metal plates, metal foils, metal rods, or metals such as copper, brass, stainless steel, or aluminum.

It is preferably made of twisted metal thread or metal net, and in particular, when it is necessary to ensure the flexibility of the planar heating element of the present invention, it may be made of metal wire or metal foil. preferable. Electrode +4. Is is PTC layer 1
4A and +5A may be bonded to both side edges of the surface of the conductive elastomer layer 12 as shown in FIG. 2(a) using an appropriate conductive adhesive or by vulcanization. .15 is PTC layer 14A, 15A
At the same time, as shown in FIG. 2(b), the conductive elastomer layers 12 and 13 may be surrounded and joined at both side edges of the cloth base material 11 provided thereon. Electrode 14.15 is PTC layer 14A,
In order to bond the electrodes 14 and 15 with a conductive adhesive, the material of the electrodes 14 and 15 (i.e., metal wire or metal foil) or the outer surfaces of the PTC layers 14A and 15A are coated with a conductive adhesive in advance. Alternatively, when the material of the electrodes 14.15 is placed on the conductive elastomer layer 12 together with the PTC layers 14^, 15^, a sheet made of conductive adhesive is interposed and the material is heated as best as possible. It may be joined by electrode +4. Is
In order to join them by vulcanization adhesion, in the case of Fig. 2(a), the material or PT
The outer surface of the C layer 14^, +5A is coated with a conductive elastomer to a thickness of about 0.1 m, and in the case of FIG. 2(b), the material of the electrode 14.15 or The PTC layers 14A and 15A are connected to the conductive elastomer layer 12.
It may be placed in direct contact with the Electrode 14
．． 15, and a conductive elastomer layer 12.
, and the volume resistivity value ρ2 of 13, ρ2/ρ, ≧
It is preferable that there be a relationship of 10”.

Electrode +4. PTC layer 14A disposed for Is.

15^ may be prepared by dispersing conductive particles in a crystalline polymer as a matrix resin, and may exhibit conductivity of, for example, about 10 -2 to 10 Ωcm. Examples of the crystalline polymer include ethylene vinyl acetate copolymer (containing 10 to 20% by weight of vinyl acetate),
If at least one of polyethylene, polypropylene, polyethylene glycol, polypropylene glycol, ethylene acrylic acid copolymer, ethylene ethyl acrylate copolymer, aliphatic polyamide, or aliphatic polyester is used, the melting point is low (150 ° C. (below), so it is preferable. Conductive particles include carbon black (furnace carbon black, channel carbon black, thermal carbon black, acetylene carbon black).

Ketjenblack, etc.), graphite powder.

It is preferable to use at least one of carbon fiber, metal fiber, metal powder, etc. The amount of the core-conducting particles added may be appropriately selected as desired, but in particular 10
It is preferable if it is 70% by weight.

The planar heating element according to the present invention generates heat as follows.

When a DC voltage is applied between the electrodes 14 and 15, the calorific value Q of the sheet heating system is determined by the applied current (ampere), the resistance R (ohm) of the sheet heating element, and the application time t of the DC voltage. (seconds) and is expressed as Q=I''Rt. Here, the resistance R is the conductive elastomer layer 12
, 13 resistance RR and PTC layer 14^, 15^ resistance 2R
It can be expressed as R=2 Rprc + RR using PTC (PTCJ!'14^ and 15A are assumed to have the same resistance for convenience of explanation).

The value of 2RPTC is approximately equal to the value of R8 near room temperature, but becomes extremely larger than the value of RR as the temperature rises.

Therefore, the current (2) flowing between the electrodes 14 and 15 becomes extremely small. Therefore, as the temperature rises, the calorific value Q decreases, and the planar heating element 10 comes to exhibit a constant temperature.

Note that the value of R is preferably 10' to 10<3 >[Omega], and may be appropriately set as desired.

Even when an alternating current voltage is applied to the electrodes 14 and 151ijl, the planar heating element exhibits a constant temperature in the same way as described above, or the explanation thereof will be omitted for the sake of brevity.

Further, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described.

Generally speaking, in the planar heating element of the present invention, conductive elastomer layers 22 and 23 are formed on both sides of the cloth base material 21, respectively, as in the first embodiment shown in FIGS. One of the conductive elastomer layers 22, 23, for example, electrodes 24a, 24b, spaced apart from each other, are provided on the conductive elastomer layer 22, for example.
25 are arranged. Here, voltages of opposite polarity are applied to the electrodes 24a, 24b and the electrode 25. 1
! The poles 24a, 24b, and 25 are provided with a PTC layer 24A on the portions of their circumferential surfaces that contact the conductive elastomer layer (here, the conductive elastomer layer 22).

24B and 25A are provided, and the high temperature state 18 increases the electrical resistance between the electrodes 24a, 24b and the electrode 25 to suppress the amount of heat generated. PTC layers 24A, 24B,
25A does not need to be disposed over the entire contact surface between the electrodes 24g, 24b, 25 and the conductive elastomer layer 22. Further, if desired, the PTC layers 24A, 24B or the PTC layer 25^ may be removed. Depending on the application of the sheet heat-generating sheet, there is no need to consider contact with surrounding members, depending on whether an insulating layer 26, such as an insulating polymer film layer such as a vinyl chloride sheet, is disposed on the surface of the sheet heating sheet. Further, when the voltage applied to the planar heat generating circuit is low, there is no risk of electric shock, so it may be removed. The rest of the structure and operation are substantially the same as those of the first embodiment shown in FIGS. 1 and 2, so the theory is correct! 1
omitted.

Further, a third embodiment of the present invention shown in FIGS. 5 and 6 will be described.

Kawa is a planar heating element of the present invention, in which conductive elastomer layers 32 and 33 are formed on both sides of a cloth base material 31, respectively, as in the first embodiment shown in FIGS. Electrodes 34 and 35 are disposed on one of the conductive elastomer layers 32 and 33, for example on the conductive elastomer layer 32, spaced apart from each other. Electrode 34. : 15 has a conductive elastomer layer (here, conductive elastomer layer 32) on its peripheral surface.
PTC layers 34^, 35A are disposed on the portions that contact the electrodes 34 and 35A, and increase the electrical resistance between the electrodes 34 and 35 in high temperature conditions to suppress the amount of heat generated. PTC layer 34^,
35A need not be disposed over the entire contact surface between electrode 34 and conductive elastomer R32.

Further, if desired, one of the PTC layers 34^ and 35^ may be removed.

An insulating layer 36 such as an insulating polymer film layer 36 such as a vinyl chloride sheet is provided on the surface of the sheet heating element, but depending on the use of the sheet heating element, contact with surrounding members may be taken into consideration. Since it is unnecessary and there is no risk of electric shock when the voltage applied to the recess of the planar heating element is low, it may be removed.Other a formations and effects are shown in Figure 1 and:
Since this embodiment is substantially the same as the first embodiment shown in FIG. 52, its explanation will be omitted.

Next, in order to better understand the sheet heating element of the present invention,
This will be explained using a specific example. For convenience of explanation, the first
Only the first embodiment shown in I21 and FIG. 2 will be described.

(Examples 1 to 3) Tetron plain woven fabric (“T359” manufactured by Ryotaisha Co., Ltd.) was used as the cloth base material ti.
2") in Table 1 as the conductive elastomer solution.
The composition of the conductive elastomer contained in the conductive elastomer solution at this time was l'' in Table 2. Roll it with a roll to a thickness of l + n and about 1 m.
The pieces cut into pieces of size m x 5 mm x 5 ■■ were placed in a closed stirrer containing half of the solvent listed in Table 1, and stirred for 3 to 6 hours with the lid closed to dissolve them.
It was made by adding the other half of the solvents in the table.

Using a roll coater with a doctor knife, apply this conductive elastomer solution to a cloth (0.03 to 0.06 for material I+).
The coating was applied at a coating speed of 1 time, and the overall thickness of the cloth base material 11 and the 7 conductive elastom layers I2 and 13 was set to a predetermined thickness (for example, 0.16 to 0.32■■) ( (See Table 3).

In parallel to this, electrodes 14 and 15 were made. That is, PTC set rJ heated at a temperature of 120°C for 10 minutes.
j, after embedding copper foil with a wall thickness of 40 gm and a width of 51 mm in the object ("l" in Table 3) by press molding, 40 m
A crosslink was formed by irradiation with a rad electron beam. PTC
The outer dimensions of the layers 14A and 15A were 2-1 in thickness, 1 in width, and 300 in in length.

Next, electrodes 14.15 are applied to both side edges of the cloth base material 11 coated with a conductive elastomer solution and cut into a size of 40 cm x 3 nm, that is, the cloth base material 11 on which the conductive elastomer layers 12.13 are disposed. On the other hand, PTC layers 14A and 15
8. By heating at a temperature of 180° C. for 20 minutes, they were bonded by pressure vulcanization.

[Pole 14. When the resistance between Is and Is was measured at a temperature of 20°C, the results shown in Table 4 were obtained.

In addition, the electrode of the sheet heating element of the present invention +4,151HI and 1
When a heat generation test was performed by applying an AC voltage of 0.0 V, results as shown in FIG. 7(a) were obtained. That is, the temperature T at the center of the surface of the sheet heating element is
As the application time t of the AC voltage for No. 5 elapsed, the temperature rose rapidly, and after 30 to 50 seconds, the temperature reached 67 to 69°C and became stable.

In addition, the flexibility of the sheet heating element of the present invention was measured in the following manner. That is, after the planar heating element of the present invention is arranged in the form of a rod with a cross-sectional radius r so that its central part is parallel to the electrode 14.15, the electrode 14.15 has both side edges approximately 2" wide. The sheet heating elements of the present invention are curved along the circumferential surface of the rod until they are separated by a distance.
Even when r=1 mm, no cracks were observed on the surface, and even when released from this state, it returned to its original state without any problem. Furthermore, when the electrical resistance between the electrodes 14 and 15 is measured in a state where it is bent against a rod with a cross-sectional radius r, the minimum value that does not show any change from the electrical resistance value measured at the beginning, that is, prior to the bending test, is determined. When the cross-sectional radius r was determined, the results shown in Table 4 were obtained.

(Examples 4 to 7) "l" to "4" in Table 1 were used as the conductive elastomer solution, and "1" to "4" in Table 3 were used as the PTCm composition, respectively.
1" to "3n were used in combination as shown in Table 4, and were processed in the same manner as in Examples 1 to 3, and similar measurement results were obtained (Table 4 and Figure 7 (a) )~(d)
), but PTC! 111&“ in Table 3 as a thing
When "2" was used, crosslinking was formed by irradiation with an electron beam in the same manner as "1" in Table 3 (see Examples 1 to 3).

(Example 8) In Example 2, the conductive elastomer layer +2. A vinyl chloride sheet (“Toughnil” manufactured by Kogen Kasei Co., Ltd.) with a predetermined wall thickness (in this case, 0.1) for the surface of 1:1.
When the insulating layer Ill was formed by arranging the insulating layer Ill, the resistance between the electrodes 14 and 15 at 20° C. was the same as that in Example 2. Regarding the heat generation test, the temperature T at the center of the surface rose slightly more slowly than in Example 2, and was stabilized at a slightly lower temperature than in Example 2. In addition, the results of the curvature test were not substantially different from those of Example 2 (Comparative Examples 1 to 4). 2, 5, 6.7 were repeated. That is, it was prepared according to Example 2, 5.6.7, and was provided with a conductive elastomer layer 12,1:l and 4
Pressure is applied to both side edges of the cloth base material 11 cut into a size of 0 cm x 35 cm by heating a copper foil with a thickness of 40#Lm and a diameter of 5m at a temperature of 180°C for 20 minutes. The electrodes 14 and 15 were bonded by sulfur bonding. 20
The resistance between electrodes 14 and 15 in "C" was as shown in Table 4.

In addition, the temperature T at the center of the surface when an AC voltage of 100 V was applied between electrodes +4 and 15, that is, when an AC voltage of Table 2, Table 3, too v was applied between electrodes 14 and 15, was: The results were as shown by broken lines in FIGS. 7(a) to 7(d), respectively.

As is clear from Table 4, according to the final IJ, the inter-electrode resistance can be improved compared to the comparative example, and at the same time, the equilibrium temperature during heat generation can be maintained constant and improved.

In the above description, the conductive elastomer layer 41 is disposed on both sides of the base material, but the present invention is not limited to this, and it may be disposed on one side if desired.

(3) Effects of the invention As is clear from the above, the sheet heating element according to the present invention is as follows.

(a) a cloth base material; (b) a conductive elastomer layer formed on at least one surface of the cloth base material and containing a conductive material; and (c) disposed on the conductive elastomer layer. (d) a PTC layer disposed on at least a portion of the circumferential surface of the electrode in contact with the conductive elastomer layer; (i) It has the effect of achieving self-temperature regulation function and overheating prevention function without additionally installing a bimetal material with a temperature of 2 g and 1 m, and (ii) has flexibility and has a small radius of curvature. It has the effect of making it easy to install it in any location and reducing the space required for storage.

Another planar heating element according to the present invention includes (a) a cloth base material; (b) a conductive elastomer layer formed on at least one surface of the cloth base material and containing a conductive material; (c) an electrode disposed on the conductive elastomer layer and connected to a power source;

(d) a PTC layer disposed on at least a portion of the circumferential surface of the electrode in contact with the conductive elastomer layer;

(c) an insulating layer disposed on the surface of the cloth base material and the conductive elastomer layer, so in addition to the effects of (i) and (ii) above, (
iii) 3 to peripheral members! It has the effect of preventing electricity.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing one embodiment of the present invention, Fig. 2 (
a) is a sectional view taken along the line n, -n of the embodiment in FIG. 1, and FIG. 2(b) is a sectional view of the embodiment in FIG.
3 is an external perspective view showing another embodiment of the present invention, FIG. 4 is a sectional view taken along line IV-1'V of the embodiment in FIG. 3, and FIG. FIG. 6 is a sectional view taken along the line Vl-VT of the embodiment in FIG. 5, and FIGS. 7(a) to (d) are respectively views of the embodiment in FIG. It is an operation explanatory diagram. 1G, 20. :lO...... Sheet heating element 11, 21.31...... Cloth base material 12, +3.22.23°32, 31- ...... Conductive elastomer layers 14, 15.24a, 24b. 25, 34.35... Electrode 14^, 15^
, 24^, 24B, 2SA. 34^, 35^...PTCP! 115
, 26. :16・・・・・・・・・Insulating layer patent applicant NOK Co., Ltd. Agent Patent attorney Takao Kudo To0 To? ToD ToQ Procedure (original seal) September 2, 1986

Claims (2)

[Claims] (1) (a) a cloth base material; (b) a conductive elastomer layer formed on at least one surface of the cloth base material and containing a conductive material; (c) a conductive elastomer layer formed on at least one surface of the cloth base material; (d) a PTC layer disposed on at least a part of the circumferential surface of the electrode in contact with the conductive elastomer layer. A planar heating element. (2) (a) a cloth base material; (b) a conductive elastomer layer formed on at least one surface of the cloth base material and containing a conductive material; and (c) a conductive elastomer layer formed on at least one surface of the cloth base material. (d) a PTC layer disposed on at least a portion of the circumferential surface of the electrode in contact with the conductive elastomer layer; (e) the fabric base; 1. A planar heating element comprising a conductive elastomer material and an insulating layer disposed on the surface of the conductive elastomer layer.