JPH0243317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heating element for a heat-retaining sheet for a vehicle, and more particularly to a method of connecting a heating element and an electrode constituting a planar heating element built into the sheet.

Generally, as shown in FIG. 1, a vehicle seat has planar heating elements 3, 3 built in near the back side of the outer skin of the seat cushion part 1 or seat back part 2, and the heating elements 3, 3 are connected to a power supply circuit (not shown). Heat is maintained by generating heat by applying electricity to the device. Conventionally, as the above-mentioned heating elements 3, 3, it has been proposed that heating wires are distributed on the surface of a flexible base material, and heat is retained by the resistance heat generated by the heating wires. If the heat generating wire becomes fatigued and breaks due to repeated loads, it has the disadvantage that local heat generation occurs, current cannot be supplied, or the seated person feels uncomfortable due to the heat generating wire.

Therefore, as the heating element 3, those shown in FIGS. 2 to 4 have recently been proposed. That is, heating element 3
In this example, an electrode 6 having holes 5 is arranged on both ends of a planar flexible heating element 4, an adhesive film 7 is arranged to cover the electrode 6, and an adhesive film 7 is also placed on the back side of the heating element 4. An insulating film (insulating sheet) 8 is placed on the outside of the adhesive film 7, 7.
8, and in this state the whole is crimped using a hot press mold. As a result, the whole can be integrated by the adhesive force generated by melting the adhesive films 7, 7, and a portion of the adhesive 7a
is adhered to the surface side of the heating element 4 through the hole 5, so the adhesive force of the adhesive 7a causes the electrode 6 to
It is possible to increase the adhesive strength of the electrode 6 and prevent the central portion of the electrode 6 from rising, thereby improving the conductivity between the electrode 6 and the heating element 4.

However, according to such a configuration, since the adhesive films 7, 7 are selected to be thin in order to have flexibility with respect to the heating element 3, a portion of the molten adhesive 7a is absorbed into the hole 5. This has the disadvantage that the adhesion force in this area is not very large because it is not sufficiently supplied to the side. This has become a particularly important problem when the diameter of the hole 5 is small.

The purpose of the present invention is to eliminate the above-mentioned drawbacks by disposing a separate adhesive film on the upper side of the electrode and performing thermocompression bonding in this state to supply a sufficient amount of molten adhesive to the electrode side. This will be explained in detail using examples.

FIG. 5 is a cross-sectional view for explaining the method of manufacturing a heating element for a vehicle heat insulating sheet according to the present invention, and the same parts as in FIGS. 3 and 4 are denoted by the same reference numerals. In this case, an electrode 6 is placed on the surface of one end of the planar heating element 4, an adhesive film 7 having approximately the same area as the heating element 4 is placed to cover the electrode 6, and an insulating film is placed on the outside of the adhesive film 7. At this time, an adhesive film 10 having approximately the same area as the electrode 5 is placed on the surface side of the electrode 5. In this state, the adhesive films 7, 7 are melted and the electrodes 6, the heating element 4, and the insulating film 8 can be bonded and integrated with each other by being subjected to a hot press mold and bonded under heat. 10 is melted and sufficiently supplied to the hole 5 provided in the electrode 6, and is bonded to the heating element 4 through the hole 5. That is, in the past, the adhesive force of the electrode 6 could not be sufficiently increased because the melted part of the adhesive film 7 was not sufficiently supplied to the hole 5, but according to the present invention, another layer is provided on the surface side of the electrode 6. Since the adhesive film 10 is arranged, the melted adhesive of the adhesive film 10 is sufficiently supplied to the holes 5, so that the adhesive force in the holes 5 can be sufficiently increased.

Incidentally, when performing pressure bonding using the hot press mold, as shown in FIG. 6, by sucking the adhesive 10a melted by air A toward the heating element 4
A portion of this adhesive 10a can penetrate into the inside of the heating element 4, thereby further increasing the adhesive strength of the electrode 6. That is, as the heat generating element 4, for example, a flexible fabric material impregnated with powder such as Ni or carbon is used, and the adhesive 10 is applied by the above method.
Since a part of a penetrates into the inside of the heating element 4, it becomes possible to further increase the adhesive force. Note that by using conductive adhesive films 7 and 10, the conductivity between the electrode 6 and the heating element 4 can be increased.

As explained above, according to the method of manufacturing a heat generating element for a heat insulating sheet for a vehicle according to the present invention, a planar heating element is used as a heating element built into the seat cushion part or the seat back part, and a surface of the planar heating element is used. an electrode having a hole provided on the side; an adhesive film provided on the surface side of the heating element so as to cover the electrode; an insulating sheet placed on the surface side of the adhesive film; After combining the adhesive film with a small-area adhesive film interposed between the adhesive film and the adhesive film, the whole is thermocompression bonded to integrate the electrode into the heating element.
Adhesive can be sufficiently supplied to the hole side where the electrode is provided, and the adhesive strength of the electrode itself can be increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a general heat insulating sheet for vehicles, FIGS. 5 and 6 are cross-sectional views showing an embodiment of the method of manufacturing a heating element for a vehicle heat-retaining sheet according to the present invention. 3... Planar heating element, 4... Planar heating element, 5...
...hole, 6...electrode, 7...adhesive film, 8...
Insulating film, 10...Adhesive film.

Claims (1)

[Claims] 1. An electrode having holes is arranged on the surface side of the end of a planar heating element, an adhesive film is arranged so as to cover the surface side of the electrode, and an insulating film is placed on the adhesive film. By arranging the sheets and pressing the insulating sheet and heating element while heating,
In the method of integrating the heating element by melting the adhesive film, an adhesive film having an area approximately equal to that of the electrode is interposed between the electrode and the adhesive film, and hot pressing is performed. A method for manufacturing a heating element for a vehicle heat insulation sheet. 2. The vehicle according to claim 1, wherein the planar heating element is made of a breathable material, and the heating element is impregnated with a portion of an adhesive that passes through holes provided in the electrode. A method for producing a heating element for a thermal insulation sheet.