JPH02270284A - sheet heating element - Google Patents

Abstract

PURPOSE:To lower electrostatic capacity and heighten safety by dividing a heat uniforming plate in one heat uniforming adhesive sheet and composing a heating apparatus with four heat uniforming plates. CONSTITUTION:Heat-fusible adhesive films 16 are laminated on both sides of two metal foils, which are arranged side by side with being narrowly separated, to give one heat-uniforming adhesive sheet 11, and some of the heat- uniforming sheets 11 are bound each other while arranged side by side and laminated on their end parts, and a flexible heat-generating wire 12 are bound to the heat-uniforming sheets 11 to compose a heater unit. This heater unit is sandwiched with a cover cloth 13 and lining cloth 14. The heat-uniforming plate 15 is thus divided in one heat-uniforming adhesive sheet 11 and a heating apparatus is composed with four of the heat-uniforming plats 15. Consequently, electrostatic capacity of the apparatus is lowered and safety is heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a planar heating device that has a large area, such as an electric carpet, and uses a heat equalizing plate made of metal foil.

Conventional technology This type of conventional surface heating device uses a flexible heating wire,
It is said that it is preferable to use a heat equalizing plate made of metal foil throughout. However, if the area of each heating plate exceeds a certain amount, the voltage applied to the heating wire will cause an induced voltage in the metal foil due to electrostatic induction, and because the capacitance is large, the charge during discharge will increase. If the waterproofness is not perfect, there are problems such as electric shock if water comes into contact with the outer fabric. Therefore, as shown in FIGS. 4 to 6, in a heat-uniforming adhesive sheet 3 made by laminating heat-melting adhesive films on both sides of a heat-uniforming plate 1 made of metal foil, there is no metal foil and only the adhesive film 2 is used. A plurality of sheets are used, each having a portion provided at the end (hereinafter referred to as the selvage portion 4), and only the selvage portions 4 are overlapped so that the portions of the heat-uniforming plate 1 do not overlap. It is known that a flexible heating wire 7 is provided, and a surface cloth 5 and a heat insulating material 6 are layered on both sides of this heat-uniforming adhesive sheet 3 and bonded together by heat.

Problems to be Solved by the Invention However, with the above configuration, it is difficult to cope with the diversification of sizes of planar heating devices in recent years. In other words, there is a demand for heating devices that are larger than 2 tatami mats, such as 2.5 tatami or 3 tatami sizes, but in the case of conventional heating adhesive sheets, the size of the heating adhesive sheet 1 and the metal foil are required. Since the areas of (heating plate 1) are almost the same, if you want to keep the area of the -thick metal foil, that is, the capacitance, below a certain level, the only option is to increase the number of heat-equalizing adhesive sheets in accordance with the dimensions of the heating device. There was no way. In addition, even when a sheet of uniform heat-adhesive sheet is about 1 tatami mat size, synthetic fibers are often used for the outer fabric and insulation material due to durability and cost reasons, which makes it easy to charge, and the amount of metal foil per sheet. Unless the size of the capacitor is made smaller, it is difficult to suppress the capacitance, reduce the t-current at the time of electric shock, and minimize the sensation of electric shock. Therefore, in order to accommodate large sizes, the number of adhesive sheets must be increased to three or four as described above, which cannot be said to be efficient in terms of cost or workability. moreover,
In the conventional configuration, the heat equalizing plate had to be placed leaving the edges 1 to 2011 of the heating device, and there was also a problem that the heat equalizing effect was not perfect.

The present invention is intended to solve these problems, and aims to provide a heat-uniforming adhesive sheet structure for a planar heating device that improves safety and is efficient in terms of cost and workability. It is something to do.

Means for Solving the Problem In order to solve this problem, the present invention consists of two sheets of metal foil that are placed side by side with a slight distance between them, and a heat-melting adhesive film is adhered to both sides of the metal foil to form a single sheet of uniformly heated metal foil. An adhesive sheet is formed, the heat-uniforming adhesive sheets are glued side by side with their edges overlapped, and a flexible heating wire is adhered to the heat-uniforming adhesive sheet to form a heater unit. It is made by sandwiching the outer fabric and the backing material.

Function: With this configuration, the heat-uniforming plate is divided among the two heat-uniforming adhesive sheets, and the heating device is composed of four heat-uniforming plates, so the capacitance can be extremely small and safety is ensured. can be increased. In addition, even in the configuration of a large-sized heating device, the area of each heat-uniforming plate, which increases the number of heat-uniforming adhesive sheets, can be kept below a certain level, resulting in excellent cost and workability.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

In Figures 1 to 3, the heat-uniforming adhesive sheets 11 are stacked in the center to form a single unit [see Figure 2 (B)], and a flexible heating wire 12 is wired and bonded to at least one side of the sheets to form a heater unit. There is. Then, this heat-uniforming adhesive sheet 11
is located on the entire surface between the outer fabric 13 and the backing material 14, and is bonded together. Specifically, two heat-uniforming adhesive sheets 11 are used, each having a heat-uniforming plate 15 made of metal foil separated approximately at the center, and a heat-melting adhesive film 16 having a thickness of 50 to 100 μm bonded to both sides of the heat-uniforming plate 15. Laminated with Agent 17. In this case, the heat soaking plate 15 and the heat-melting adhesive film 1
6 coincide with each other on both end surfaces. The material of the heat equalizing plates 15 is aluminum foil with a thickness of 7 to 20 μm.The interval C between the separated heat equalizing plates 15 is set to 2 to 10 -, which does not affect the heat equalizing effect of the heating device and is electrically The dimensions are such that they are not connected and allow for stable processing. Hot melt adhesive film 1
In No. 6, one side of the heat soaking plate 15 was made of polyethylene, and the other side was made of polyester resin. However, this material for both films is conceivable, such as olefin-based, ester-based, or olefin-based resins graft-polymerized with vinyl chloride.

In the above configuration, the heating plate 1 is placed within the heating adhesive sheet 11.
5 can be divided into two parts, and a heat-uniform adhesive sheet 11 is overlapped in the central part, but since the metal foil is overlapped with a film of twice the thickness of 50 to 100μI, it seems that it is melted by heat. However, they are separated without direct contact. Therefore, since the stacked portions in the center are not electrically connected, four pieces of metal foil with an area half the area of conventional metal foils are assembled. In other words, the capacitance is half that of the conventional one, so even if the heating device is 2.5 tatami mats or 3 tatami mats in size, it can be constructed with two heat-uniforming adhesive sheets. Furthermore, since the configuration of the heat-uniforming adhesive sheet is different from the conventional one, the heat-uniforming plate 15 made of metal foil can be provided on the entire surface of the heating device.

Effect of the invention As described above, according to the present invention, the following effects can be obtained.

(1) - The heating plate is divided into two heat-uniforming adhesive sheets, and the heating device is made up of four heating plates, so the capacitance can be extremely small, increasing safety. be able to.

(2) Even in the configuration of a large-sized heating device, the area of each heat-uniforming plate, which increases the number of heat-uniforming adhesive sheets, can be kept below a certain level, so it is excellent in terms of cost and workability.

(3) A heat equalizing plate can be placed on the entire surface of the heating device to increase the heat equalizing effect.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a plan view of the planar heating device, Figure 2 is a sectional view of the same, and Figure 3 (
A) and (B) are enlarged sectional views of main parts of the separated part and overlapped part of the heater unit, and FIGS. 4 to 6 show conventional examples,
Fig. 4 is a plan view of the planar heating device, Fig. 5 is a sectional view of the same, and Fig. 6 is a plan view of the planar heating device.
The figure is an enlarged cross-sectional view of the main part of the overlapping part of the heat-uniforming adhesive sheets. DESCRIPTION OF SYMBOLS 11... Heat soaking adhesive sheet, 12... Flexible heating wire, 13... Outer fabric, 14... Backing material, 15... Heat soaking plate, 16... Heat-melting adhesive film , 17...adhesive. Agent Yoshi Morimoto Private use Figure 1

Claims (1)

[Claims] 1. Two sheets of metal foil are placed side by side with a slight distance between them, and a heat-melting adhesive film is adhered to both sides to form a single heat-uniform adhesive sheet.The ends of the heat-uniform adhesive sheets are overlapped with each other. A planar heating element made by adhering these sheets side by side, and forming a heater unit by adhering flexible heating wires to this heat-uniforming adhesive sheet, and sandwiching this heater unit between a front fabric and a backing material.