JPH02877Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the improvement of a sheet heating element made of woven fabric coated with conductive paint such as carbon paint, and used as a rug or other heating material. It is.

(Prior art and its problems) Conventionally, this type of sheet heating element was made by weaving electrode wires into both sides of an impregnated woven fabric such as cotton cloth, coating the entire surface with conductive paint such as carbon paint, and then insulating it. It is covered with a sheet, and the electrode wires used here are about 12 twisted wires made of 5 to 8 thin metal wires, and are woven into a satin weave with the warp or weft. . However, there is a difference in tension between the strands and the warp or weft, resulting in poor followability between the part where the strands are woven and the other parts of the woven fabric. Wavy unevenness is formed,
There are disadvantages such as the fact that the application work of carbon paint etc. cannot be done smoothly and the adhesion of the insulating sheet becomes unstable and delamination is likely to occur.

Furthermore, during long-term use, damage to the heating element in the area of delamination is promoted, causing abnormal heat generation and the like.

(Means for solving the problem) This project was researched to solve the above-mentioned drawbacks of the conventional planar heating element, and by weaving multiple electrode wires as braided wires, it can be used as a braided wire. It was found that it was possible to make a safe planar heating element that had good followability with the parts and could be made flat without any wavy irregularities, allowing for smooth application of conductive paint and attachment of insulating sheets, and no delamination between layers.

The present invention will be explained with reference to the illustrated embodiment.The woven fabric 1 is made of a material with good impregnation properties such as cotton fabric, and the electrode wires 2 are woven on both sides of the woven fabric 1 in the warp direction. 3 is the warp threads 4, 4... and the weft threads 5, 5...
are made into four pieces of Venice weave, small gaps 7, 7... are formed at the four corners of the rectangular weave structure 6, 6... formed by this Venice weave, and the electrode wire 2 is made of thin copper tin-plated wire or the like. Thin, flexible, stretchable braided wires 8, 8 knitted in a tubular or flat shape are used, and the warp threads 4, 4 and weft threads 5, arranged on both sides of the braided wire 8 and the braided wire 8 are used.
The weaving structure of 5... has been changed to a Venice weave (a structure in which the two warps 4, 4 are woven into a braided line 8), with small gaps 10, 10... is formed.

In this way, the braided wires 8, 8 are woven in a Venetian weave as the electrode wires 2, and a conductive paint 11 such as carbon paint is applied to the entire surface of the woven fabric 1 with a Venetian weave in the center to form the heating element main body 12. do. Insulating sheets 13, 13 such as vinyl sheets are placed on both sides of this heating element main body 12, and the insulating sheets 13, 13 cover at least some or all of the small gaps 7, 7..., 10,
10...It is partially directly attached or welded at position 10.

The number of warp threads 4 and weft threads 5 constituting the square weave structure 6 can be arbitrarily determined. Furthermore, the weaving structure in the center of the woven fabric 1 or the weaving structure of the braided lines 8, 8 and the threads 4, 5 is not limited to the Venice weave or a modified Venice weave, but may be woven with any other suitable weave structure. Good.

(Function/Effect) As described above, in this case, the braided wire 8 is used as an electrode wire on both sides of the woven fabric 1 in the warp direction, so that the braided wire 8 is connected to other parts of the woven fabric by elongation and contraction of the braided line itself. The braided wire 8 has good followability and has a flat finish without creating wave-like irregularities, making it possible to apply conductive paint and attach insulation sheets smoothly.
It is integrated with conductive paint and insulating sheet by pressure bonding, and has excellent durability without causing delamination.

[Brief explanation of drawings]

Fig. 1 is a plan view of the planar heating element according to the present invention, Fig. 2 is an enlarged explanatory view showing the weave structure of the part where woven fabric and braided wire are woven, and Fig. 3 is the same as Fig. 1.
It is a line enlarged cross-sectional explanatory view. 1 is a woven fabric, 2 is an electrode wire, 4, 4... is a warp, 5,
5... is a weft, 6, 6... is a square weave structure, 7, 7... is a small gap, 8 is a braided line, 9, 9... is a pseudo square weave structure, 10, 10... is a small gap.

Claims (1)

[Scope of utility model registration request] A planar heating element that uses braided wire as the electrode wire, in which an insulating sheet is applied to both sides of the heating element body, which has electrode wires woven into both sides in the warp direction of a woven fabric and is coated with conductive paint.