JPS6114157Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a surface heating element having an improved structure of electrode parts and having extremely good flexibility.

It is known that a sheet heating element can be obtained by forming a conductive paint such as Keybon paint into a thin film or applying it to an insulating base, and then applying electricity to electrodes placed at a distance from each other. The construction of the electrodes of heating elements is difficult, especially in those requiring flexibility, and this has been a practical problem. In other words, with such a device, it is necessary to form an electrode along the edge of the heat-generating part coated with conductive paint, and to uniformly flow current to the heat-generating part via this electrode.
Since metal wires are used for the electrodes, contact with the conductive paint is poor, and in cases where flexibility is required, peeling may occur between the metal wire and the conductive paint due to bending.
This was likely to cause problems such as loss of electrical contact. In view of these problems, the inventors of the present invention woven metal wires into a woven fabric coated with conductive paint, used this as an electrode, and impregnated this woven fabric with conductive paint to make it flexible. We have succeeded in obtaining an ideal surface heating element that has good properties and also has good adhesion to conductive paint. In this type of material, the conductive paint impregnated into the woven fabric is applied in reliable and uniform contact with the woven metal wire, and not only does it provide uniform electrical contact, but also the contact between the metal wire and the conductive paint by bending. It is possible to maintain adhesion and to obtain a flexible product. However, when metal wires are woven into woven fabrics, the metal wires and threads are different, and due to the difference in tension when applied to the loom, waveform deformation occurs in the woven fabric's conductive paint area, that is, the electrode area. However, new problems arose in that this not only damaged the appearance but also interfered with the work of applying the carbon paint and the work of attaching an insulating sheet for electrically insulating the surface heating element. In addition, since thin metal wires such as copper wires with smooth surfaces are used, it is necessary to improve the adhesion between the metal wires and the conductive paint. When it was made into a strip made of only conductive wires, it was likely to peel off due to bending motion, and there was also a risk that the durability would decrease.

This idea was made based on the circumstances of the above article, and its purpose is to arrange metal wires every one or more warp threads when weaving metal wires, and also to arrange metal wires every other warp thread or multiple warp threads. It is an object of the present invention to provide a highly durable surface heating element that eliminates corrugation by forming a skip-like weave, and also ensures the adhesion of the conductive paint to the electrodes.

An embodiment of this invention will be described below based on the drawings.

In the figure, numeral 1 is a woven fabric with good impregnation properties, such as cotton fabric, to which a conductive paint such as carbon paint is applied. This woven fabric 1 adopts a weaving method, that is, a weaving method in which the warp threads 2 jump over a plurality of weft threads 3 (four in the illustration). Electrodes 4, 4 are formed on both side edges of the woven fabric 1, and these electrodes 4, 4 are constructed by weaving metal wires 5 into the woven fabric 1. The metal wires 5 constituting the electrodes 4, 4 are, for example, copper tin-plated wires with a wire diameter of 0.2 mm, and the woven fabric 1
It is woven as a warp along both sides of the In this case, the metal wire 5... is approximately
For example, three warp yarns 2 are arranged between the metal wires 5, so that the overall width a of the electrode 4 is about 10 mm. At the same time, these metal wires 5 are woven into a weave that skips over a plurality of weft threads 3 (four in the figure). A conductive paint 7 such as a carbon conductive paint is applied to the entire surface of the woven fabric 1 constructed as described above, including the electrodes 4, using a coating machine such as a roller coater or a knife coater, thereby constructing a surface heating element 8. Ru. The surface heating element 8 is constructed as a heating sheet that is thin and extremely flexible as a whole by having both the front and back sides covered with electrically insulating sheets 9, 9 such as vinyl sheets. Ru.

The electrodes 4, 4 in one embodiment of the present invention configured as described above have metal wires 5 arranged every other or every warp thread 2, so that the electrodes 4, 4 are arranged along both sides of these metal wires 5. The conductive paint 7 is impregnated and held in the warp threads 2, and is held as if cross-linked between the warp threads 2 on both sides. Good adhesive contact is achieved all around, ensuring reliable electrical contact. In addition, since the metal wires 5 are woven in a shiyusu weave that skips over multiple weft threads 3, these metal wires 5...
As shown in FIG. 4, the woven portion is prevented from deforming into a wavy shape. That is, when weaving such a woven fabric 1, metal wires 5...
Tension is applied to the warp threads 2 and 2. However, since the metal wires 5 have little elasticity and the warp threads 2 made of cotton thread have high elasticity, when they are removed from the loom, the warp threads 2 ... shrinks more. However, if the metal wires 5 intersect each weft thread 3 as in plain weave, the contraction force of the warp threads 2 is transmitted to the metal wires 5 through each weft thread 3, and eventually these metal wires 5... are bent into a wave shape, and the part where the metal wires 5... are woven is deformed into a wave shape. However, in this embodiment, since the metal wires 5 are woven in a loose weave, the metal wires 5 and the warp threads 2 are mutually restrained because the metal wires 5 are woven at intervals of a plurality of threads. The difference in shrinkage between the metal wires 5 and the warp threads 2 acts concentratedly on these parts. Then, the above-mentioned weft thread 3... and warp thread 2
Since the flexibility of... is extremely large compared to that of the metal wires 5..., these metal wires 5... are the weft threads 3...
In the part that passes through ..., weft thread 3... and warp thread 2...
By disrupting the weave arrangement, the difference in shrinkage between the metal wires 5 and the warp threads 2 is absorbed, and the metal wires 5 are prevented from being bent into a waveform. In addition, when the conductive paint 7 is applied to such a woven fabric 1 to form a heat generating sheet, the entire heat generating sheet is bent, causing the metal wires 5, the warp threads 2, and the weft threads 3 to become misaligned with each other. Due to this displacement, the conductive paint 7 applied to the metal wires 5 peels off, making the electrical contact unstable and causing a decrease in durability. By the way, as mentioned above, since the metal wires 5 are woven in a loose weave, the number of locations where the metal wires 5 pass through the weft threads 3 is extremely small compared to other weaving methods such as plain weave. Therefore, since the fabric is easily loosened, the proportion of the weft threads 3 restrained by the metal wires 5 is small, resulting in high flexibility and stretchability. In this way, if these warp threads 2... and weft threads 3... are in a state where they can freely follow the metal wires 5..., the conductive paint 7
These warp threads 2... and weft threads 3...
bends following the metal wires 5, and the conductive paint 7 coated on the surface of the metal wires 5 does not peel off.

As a result, stable electrical contact can be obtained and durability can also be improved. Further, since the plurality of weft threads 3 over which the metal wires 5 jump are arranged closely, a large amount of the conductive paint 7 is well impregnated and retained in these parts, and the conductive paint 7
The adhesion between the metal wire 5 and the metal wire 5 is made more reliable.

As explained above, this invention is made by applying a conductive paint to a woven fabric having electrodes made by weaving multiple metal wires, and the metal wires are woven every other warp thread or every other warp thread. At the same time, the gist of the present invention is a surface heating element characterized in that the warp and metal wires are woven in a drizzle weave that skips over a plurality of wefts. According to such a surface heating element, since the electrodes are arranged every other warp thread or every other warp thread, the conductive paint is impregnated and held in the warp threads on both sides of each metal wire. Since the conductive paint is held in a cross-linked manner across the warp yarns of the metal wire, the conductive paint adheres well to the entire circumference of the metal wire, resulting in reliable electrical contact. In addition, because the metal wire is woven in a weave that jumps over multiple weft threads, there are significantly fewer intersections between the metal wire and the weft than in other weaving methods, which causes unreasonable waveform deformation of the metal wire. There is no waving deformation of the electrode because there are no intersections, and the binding force between the metal wire and the weft and warp threads is small, making it highly flexible and stretchable, and the adhesive force of the conductive paint prevents deformation of the conductive paint. It is easy to follow, does not peel off from the conductive paint, and has excellent flexibility. Furthermore, since Shiyusu weave has a larger number of warp and weft threads per unit area than other weaves, this also contributes to improved adhesion with conductive paint. As a result, the conductive paint adheres well, there is no electrical problem due to poor adhesion, and the conductive paint does not peel off due to bending or the like, resulting in improved durability. In addition, since the waving deformation of the electrode part is eliminated, not only is there no problem in applying conductive paint and pasting insulation sheets, but also the appearance of the product is improved, and many other benefits can be obtained. .

[Brief explanation of the drawing]

The figures show one embodiment of this invention. Figure 1 is an external perspective view of a surface heating element, Figure 2 is a plan view showing the weaving method in the part shown in Figure 1, and Figure 3 is the middle of Figure 2. FIG. 4 is a sectional view taken along the line - in FIG. 2, and FIG. 4 is a sectional view taken along the line - in FIG. 1... Woven fabric, 2... Warp, 3... Weft, 4,4
... Electrode, 5 ... Metal wire, 7 ... Conductive paint, 8 ...
...Surface heating element, 9,9...Insulating sheet.

Claims (1)

[Scope of utility model registration request] In a woven fabric having electrodes formed by weaving a plurality of metal wires in the warp direction and applying a conductive paint, the weaving of the metal wires is arranged every one or more warp threads, and the warp and A surface heating element characterized by being woven in a Shiyusu weave in which metal wires jump over multiple weft threads.