JPH01260780A - Surface heating element - Google Patents

Abstract

PURPOSE:To obtain an electric heating sheet efficiently which is made as thin as possible and is excellent in flexibility and durability by piling insulating films made of resin of pressure type fusion bond on the front and back sides so as to be fusion bonded with pressure all over the face heating element, and thereby letting the front and rear insulating films concurrently be integrally fusion bonded by way of through holes. CONSTITUTION:Each of insulating films 18 and 19 is fusion bonded onto the surface of a face heating element 11 so as to be integral by way of through holes 17 made on the face heating element 11. The front and rear insulating films 18 and 19 are relatively fusion bonded with each other in such a way that each fine distinction is made between the respective through holes 17 in the face heating element 11 as if each distinction were enveloped by fine insulation bags so that the element is held by the films. And they are integrally formed into one in such a way that those insulating films 18 and 19 will never be separated, any stress increasing the internal separation of the face heating element 11 from the front and rear insulation films 18 and 19 will thereby hardly act on the face heating element 11. This constitution thereby enables the face heating element to be obtained, which is thin and flexible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a surface heating element mainly used in electric heating sheets such as electric heating sheets, electric carpets, electric chair upholstery, and electric cushions.

(Prior art) An electric heating sheet is composed of a surface material such as pile cloth, a heat insulating back material such as felt, and a surface heating element inserted between them. There are two types of surface heating elements: those in which a special electrical material such as aluminum is printed on an insulating film, and those in which electrode terminals are taken out by attaching electrode tape to both edges of a conductive sheet. There is a type.

The former type becomes unusable due to a partial break in the wiring, but the latter type does not become unusable even if a portion of the conductive sheet breaks, and most electric heating sheets these days are of the latter type. The type is used.

This latter type of surface heating element is made by applying and impregnating a non-woven fabric made of conductive fibers, particularly carbon fibers, with a binder to reinforce the surface heating element, and then adhesively covering the front and back surfaces of the nonwoven fabric with an insulating film. There is.

Therefore, the nonwoven fabric serving as the conductor must be bulky enough to be impregnated with the binder, and the surface heating element using this fabric is thick.

[Problem to be solved by the invention]

Most electric heating sheets are rolled up or folded before being shipped or stored.

For this reason, the front material and the heat insulating back material are stretchable and flexible.

However, surface heating elements must not expand or contract and change their conductivity or electrical resistance, and are made thick and strong. The bending stress applied when handling the device by rolling it up or folding it tends to cause intralayer 931M in the surface heating element, which increases the risk of abnormal heat generation and unusability.

At the same time, when adhering surface heating elements and insulating films, it is necessary to select adhesives that exhibit adhesion properties depending on their type, and the first step is to apply and adhere them. Having to go through two processes is a major negative factor that hinders production efficiency.

C. Object of the Invention] Therefore, an object of the present invention is to make the surface heating element as thin as possible to efficiently obtain a highly flexible and durable electric heating sheet.

[Structure of the invention]

The surface heating element 16 according to the present invention achieves the above object, and includes highly conductive electrodes along the left and right edges of the film-shaped surface heating element 11 having a thickness of 500 μm or less and having conductivity over the entire surface. In the surface heating element 16, tapes 12 and 13 are attached, and terminals of the electrode tapes 12 and 13 are used as positive and negative electrode terminals 14 and 15, respectively.
The surface heating element 1 is made by providing through holes 17 evenly distributed on the entire surface of the element 1 with a spacing of 10 cm or less, and overlapping insulating films 18 and 19 made of pressure-thermal adhesive resin on the front and back sides of the holes 17.
1, and the front and back insulation films 18 and 19 are integrally fused through the through hole 17.

As the surface heating element 11, a metal-deposited film with low conductivity, an extremely thin metal foil, or Japanese paper or other paper made with conductive fibers is applied. 200μ thick with conductive fibers that cause peeling problems
It is effective when paper of approximately 70 μm or less is applied to the surface heating element.

The electrode tapes 12 and 13 are attached to the surface heating element 11 by l1ilk attachment, a conductive adhesive containing carbon black, etc., or metal vapor deposition.

The through hole 17 has an opening diameter of about 1 to 31 fi,
Preferably, the holes are evenly spaced over the entire surface of the surface heating element 11 at intervals of 10 to 20 squares.

The insulating films 18 and 19 are made of ethylene vinyl acetate resin, polyolefin resin, low melting point nylon, etc., which are used for hot melt adhesives, and generally have a melting point of 90 to 150°C.
Use the one.

〔Effect of the invention〕

According to the present invention, the insulating films 18 and 19 are each fused to the surface of the surface heating element 11, and become integral with each other through the through hole 17 formed in the surface heating element 11.

Therefore, the development #) element 11 is divided into small pieces between the through holes 17 and fused to the front and back insulating films 18 and 19, as if wrapped in a bag of rope insulating films, and the element 11 is sandwiched between them. , those insulating films 18 and 19
Since they are integral and cannot be peeled off, the surface heating element 11 is less susceptible to stress that would cause internal peeling of the surface heating element 11 from the front and back insulating films 18 and 19.

As a result, it is possible to reduce the amount of binder used when forming the surface heating element 11 by bonding conductive materials, such as when making a paper-made surface heating element by incorporating conductive fibers. This results in a thickness of less than 200μ/70
It is possible to obtain a thin and flexible surface heating element 16 using surface heating elements 11 of approximately μ in size, and even carbon fibers with poor adhesiveness can be incorporated together with pulp fibers as conductive fibers.

The through holes 17 distributed over the entire surface are voids formed only by the insulating film without any conductive material intervening, so the surface heating element 1
6 is made of a flexible material, thereby making it possible to obtain a surface heating element 16 that can be bonded to a metal plate and bent integrally.

Furthermore, since the insulating films 18 and 19 are integrally connected through the through hole 17, the insulating film 1
It is also difficult to separate between 8 and 19 and the surface heating element 11, and therefore,
The insulating films 18 and 19 can be firmly bonded to the surface heating element 11 by simply pressurizing and heat-sealing them without applying any special adhesive between them.
can be obtained efficiently. - As described above, according to the present invention, it is possible to economically obtain the surface heating element 16 which is thin and flexible enough to be bonded to a metal plate etc. and bent integrally, and its industrial beads There are a lot of things to do.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a surface heating element according to the present invention, and FIG. 2 is an enlarged sectional view of the surface heating element according to the invention. DESCRIPTION OF SYMBOLS 11... Planar heating element, 12, 13... Electrode tape, 14, 15... Electrode terminal, 16... Planar heating element, 17... Through hole, 18, 19... Insulating film.

Claims (1)

[Claims] Highly conductive electrode tapes 12 and 13 are attached along the left and right edges of a film-like surface heating element 11 with a thickness of 500 μm or less and whose entire surface is conductive. Electrode terminals 14 and 15
In the surface heating element 16, through holes 17 are provided evenly distributed at fine intervals L of 10 cm or less on the entire surface of the surface heating element 11, and insulating films 18 and 19 made of electrothermal adhesive resin are overlaid on the front and back sides of the holes 17. A surface heating element characterized in that it is constructed by pressure-heating the entire surface of the surface heating element 11 and integrally welding the front and back insulating films 18 and 19 through the through hole 17.