JPS6394573A - Panel heater - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a sheet heating element that requires a hard surface, such as floor heating, panel heaters, trouser presses, and the like.

2. Description of the Related Art Conventionally, this type of sheet heating element has been disclosed in, for example, Japanese Patent Application Laid-Open No. 55-337.
No. 01 (hereinafter referred to as Conventional Example 1) and Japanese Patent Application Laid-open No. 1983-81
This is proposed in Japanese Patent No. 96 (hereinafter referred to as conventional example 2).

According to Conventional Example 1, a heating element is formed into a desired shape on the back surface of a heat equalizer and temporarily fixed at several places with adhesive tape.

A heat insulator was applied through a thin plastic film with adhesive properties on both sides, and these were integrated by hot pressing.

Furthermore, according to Conventional Example 2, at least one of the upper and lower pair of openable and closable holding plates is coated with a resin having a heating element, and a cover cloth is applied to one surface of the heat equalizer through the coated resin.
A heating element that can be melted with the resin was disposed on the other side and bonded together.

Problems to be Solved by the Invention According to the above configuration, in Conventional Example 1, the nine heating elements are temporarily fixed to the back surface of the heat equalizing element with adhesive tape, so the temporarily fixed heating elements cross each other and generate electricity. Insulation cannot be ensured,
It becomes defective, has poor workability, and is poor in mass production.

In addition, since the heat insulating body and the heat equalizing body are bonded to a plastic film that has adhesive properties on both sides, if a heat cycle is performed for a long period of time, the adhesive interface will peel off and form an air layer, causing localized overheating. There have been problems in that it is easy to cause damage and has poor durability and reliability.

In conventional example 2, during the hot press bonding process in which the two heating elements are welded to the resin coated on the surface of the heat equalizer, the thick and rigid heat equalizer expands during heating, causing uneven pressure on the warp and the first heat generating element. Because of the addition of Since the heating element and the covering of the heating element are insufficiently welded together due to the residual heat of the heating element, the two heating elements may peel off from the heating element or the welding may be incomplete.

Also, if you want to integrate a heat insulator with a heater unit welded to a heat equalizer, heat and press it again.

The heating wire is thermally deformed and insulation cannot be ensured.

Therefore, it is necessary to bond without heating, resulting in a structure in which the nine heating elements are sandwiched between the heat insulator and the heat equalizer, making it impossible to use the device under compressive stress.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks. A heater unit is constructed in which a cord-shaped heating element is thermally welded to an adhesive thin film-like body, and the cord-shaped heating element constituting this heater unit is used as a heat equalizer to thermally melt the cord-shaped heating element. The adhesive coating is adhered with a substantially uniform thickness.

Effects: (1) By interposing the heater unit between the thermally deformable heat insulating body and the heat equalizing body, it is possible to eliminate the crossing of the cord-shaped heating elements.

(2) Even when heat compression bonding is performed for integral bonding, the heat-fusible covering does not undergo significant thermal deformation, and electrical insulation can be ensured.

(3) Complete integral bonding eliminates local overheating, withstands compressive stress, and ensures long-term reliability of adhesive strength.

Example An embodiment of the present invention will be described below with reference to the drawings.

The configuration of the embodiment is as shown in FIGS. 1 and 2.

In the figure, 1 is a heat insulator made of needle-punched felt material, foamed urethane, etc., which has the property of being thermally deformed by heating and compression bonding, and 2 is a heat insulating material made of a core thread 6 with a metal resistance wire 4 wrapped around the outer periphery. A cord-shaped heating element whose outermost layer is coated with a heat-fusible coating 5 made of a thermoplastic elastomer having a hardness of 50 to 100, and 6 is a film that can be welded to the heat-fusible coating 5 by thermocompression bonding. 7 is a heater unit formed by welding and fixing a cord-shaped heating element 2 arranged in a meandering manner to the surface of the adhesive thin body 6 by thermocompression bonding; 8 is a heat equalizer made of a steel plate or the like; The heater unit 7 is integrally joined to the heat insulating body 1 by the adhesive thin body B by heat and pressure bonding, and the cord-shaped heating element 2 constituting the heater unit 7 is oriented toward the heat equalizing body 8 side. The heat insulating body 1 and the heat equalizing body 8 are assembled and bonded together by heat and pressure bonding. Here, the heat-fusible covering 5 of the cord-shaped heating element 2 having the rubber hardness limited as described above is adhered to the heat equalizing element 8 with a substantially uniform thickness.

Next, the operation of this embodiment having the above configuration will be explained.

The cord-shaped heating element 2 has a rubber hardness of 50 to 50.
By providing the heat-fusible covering 5 made of a thermoplastic elastomer having a hardness of 100, for example, an ethylene propylene resin component and an ethylene propylene rubber component, the adhesive thin body 6 and the Welding and insulation 1. Insulating properties can be ensured without causing significant deformation in the process of sequentially stacking the heater unit 7 and the heat equalizing body 8 and bonding them together by heat and pressure.

That is, even if the heat-fusible coating 5 made of thermoplastic nidistomer is pressurized in the temperature range of 130 to 180°C, it will not revert to its original shape after the pressure is removed because it has rubber elasticity. Original.

Therefore, since the thickness of the heat-fusible covering 5 can be kept substantially uniform, there is no deterioration in insulation performance.

Moreover, the reason why the hardness of the heat-fusible coating 5 is limited to 50 to 100 is as follows.

If the rubber hardness is less than 50, the rubber elasticity improves, but it becomes too soft and deforms under compressive stress, resulting in a decrease in insulation properties, and the moldability deteriorates, making it unsuitable as a covering member. . If the hardness exceeds 100, the restorability due to rubber elasticity will be reduced, and the material will remain permanently deformed during heat and pressure bonding, resulting in a reduction in insulation properties. Because of these disadvantages, the more preferable hardness of the heat-fusible coating 5 is 60 to 60.
85 is suitable.

The heat-fusible coating 5 is made of a thermoplastic elastomer that is easily welded to the olefin-based adhesive thin body 6, so that the cord-shaped heating element 2 is arranged in a meandering manner in advance, and the adhesive thin body is placed on the cord-shaped heating element 2 in a meandering manner. Just by placing the cord-shaped heating element 2 and bonding it by thermocompression, the cord-shaped heating element 2
Not only can the inconvenience of parts crossing each other and overlapping each other be eliminated, but also the handling and work efficiency of the secondary integration joining process can be improved.

The reason why the cord-shaped heating element 2 of the heater unit 7 is integrally joined toward the heat equalizing element 8 is as follows.

(1) The heat-fusible covering 5 is thermally deformed to some extent during the thermocompression bonding process when obtaining the heater unit 7, but the heat-fusible covering 5 that is not thermally deformed is the heat-adhering body 8. Since the heating and pressing is carried out with the heat and pressure bonding facing toward the surface, even the stress of heating and pressing for integral bonding is sufficient to make the thickness of the heat-fusible covering 5 substantially uniform and to maintain sufficient insulation properties.

(2) Heat insulator 1, heater unit 7 and heat equalizer 8
Since the heat insulating body 1 has the property of being thermally deformed, when the heat insulating body 1 is heated and pressed one after another, the cord-shaped heat generating body 2 is wrapped around it to fill the gap between it and the heat equalizing body 8. In this way, the adhesive thin body 6 fills the space between the cord-shaped heating elements 2 while the heat insulating body 1 is thermally deformed, and contributes to bonding only when it comes into contact with the heat equalizing body 8. Even with a thin adhesive film of ~150μ, the integrated bond strength is large.

It has been experimentally confirmed that the T-peel strength of products integrally bonded using the casting means of the present invention is 3 to 4.
5 and 9, but when the cord-shaped heating element 2 is integrally joined toward the heat insulating body 1 side, the value becomes 0.5 to 2. The superiority of the integrated joint toward the 8th side became clear.

The reason why the heat insulating body 1 is required to have the property of being deformed by heat and pressure bonding is that it is integrated with the hard and highly rigid heat equalizing body 8 by heat and pressure bonding.

That is, the heater unit 7 must be interposed between the heat insulator 1 and the heat equalizer 8, and the cord-shaped heating element 2 must be integrally assembled with as little thermal deformation as possible.

Furthermore, in order to efficiently transfer the heat generated from the cord-shaped heating element 2 to the heat equalizing element 8, it is necessary to prevent the formation of an air layer around the cord-shaped heating element 2. According to the configuration of the present invention, the heat insulating body 1 is thermally deformed and tightly adheres to the periphery of the cord-shaped heat generating body 2, so that local overheating does not occur and the heat insulating body 1 can withstand compressive stress.

Effect of the invention As described above, the present invention has the following effects.

Its industrial value is that of dogs.

(1) By forming the heater unit, the cord-shaped heating elements do not cross each other during the manufacturing process, which eliminates the problem of poor insulation caused by the crushing of the heat-fusible covering of the cord-shaped heating elements.

Work efficiency can be improved and mass production is excellent.

(2) Since the heater unit is integrated with a heat insulating body and a heat equalizing body, there is no need to worry about local overheating and it has excellent durability and reliability.

(3) Thermoplastic elastomer with rubber elasticity is used for the outermost part of the cord-shaped heating element.

The heat-adhesive coating does not undergo significant thermal deformation even under the stress of heat-pressure bonding, and can be used under compressive force.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cutaway essential part of a planar heating element showing an embodiment of the present invention, and FIG. 2 is an exploded sectional view of an essential part of the planar heating element. 1゛°°°°Insulation 2... Cord-shaped heating element. 5... Heat-fusible covering body, 6... Adhesive thin body. 7... Heater unit, 8... Soaking body.

Claims (1)

[Claims] In a planar heating element constructed by integrally adhering a heater unit (7) to a heat soaking body (8) made of a steel plate, the heater unit (7) is attached to the outermost part with a rubber hardness of 50 to 100.
A cord-shaped heating element (2) coated with a heat-fusible coating (5) made of a thermoplastic elastomer having a hardness of
is thermally welded to a film-like adhesive thin body (6), and a cord-shaped heating element (2) constituting the heater unit (7) is attached to the cord-shaped heating element (8). A planar heating element characterized in that a heat-fusible covering (5) of a body (2) is adhered to the body (2) with a substantially uniform thickness.