JPH03263781A - sheet heating element - Google Patents

Abstract

(57) [Summary] 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 low-temperature planar heating element used as a heating source for toasters and the like.

BACKGROUND OF THE INVENTION Mica heaters have been commonly used as planar heating elements in low-salt areas, and have been used as heating sources for various home appliances for a long time.

This mine 1 heater generally has a pair of mica plates, in which a ribbon-shaped heating element is wound around a mica plate, which is arranged between the two mica plates, and these are integrated with an eyelet or the like.

Recently, other types of heaters with the same structure as the mica heater, but in addition to the above-mentioned integration of the hemlock, etc., have been integrated with an adhesive mainly composed of P2O5-BaO (Japanese Patent Publication No. 4780/1983), and ribbon-shaped heaters. A sheet-shaped heating element is used instead of a mica plate wrapped around a heating element, and it is integrated with an inorganic adhesive (Japanese Patent Application Laid-open No. 13590/1982), and a ceramic paper is used instead of a mica plate ( Various proposals have been made, such as Japanese Patent Laid-Open No. 64-50382).

Problems to be Solved by the Invention However, conventionally used mica heaters generally have weak mechanical strength and are used by pressing metal plates from both sides of the mica plate to integrate them.

For this reason, there was a problem in that the thermal density was large and the temperature -1 was extremely slow.

Also, Kinhada Itanoma J. In this case, heat radiation and non-stick properties are poor, so it cannot be used as is, and it is necessary to perform appropriate surface treatment on the surface of the metal plate. It also has '7'-shi.

On the other hand, when the P2O5-Ba, O system is integrated with an adhesive that consists of two main components, a ribbon-shaped heating element is wrapped around it. Used 2
If the button is integrated with an inorganic adhesive, it will have poor electrical properties such as moisture resistance. In addition, instead of mica plate σ), the main component is Silitzur 7) 1-groove fiber. Ceramic vapor is used because the mechanical strength of ceramic vapor is weak. The mechanical strength of the planar heating element was weak, which caused problems with the cracks and cracks.

Conventional squid heaters and other planar heating elements have problems such as slow temperature rise, inferior mechanical strength, and poor electrical properties. That is the reality.

The present invention is intended to solve the above-mentioned problems.The first purpose is to increase the temperature quickly, and -) improve mechanical strength Jj and electrical strength 1.
1) To provide an inexpensive planar heating element with excellent properties.
In addition, the second Q) [1 is to provide a planar heating element with excellent heat radiation and)
It is also 0).

Section 8 - Solution 4 - Q) Means In order to achieve the first objective -4, the first means of the present invention is to provide an insulating material M made of two fibers. In between, there is a heating element made of a metal foil body (1 is a heating element device in which a heating element made of a ribbon-shaped heating wire is wound around a molded body made by hardening and molding -F glass fiber 7 with silicone resin. , the insulating layer made of the two sheets of car'> Xwi, and the heating element or heat generating part made of the dark blue 11 substrate are made of silicone resin. A second means of the present invention for achieving the second objective is to form a surface treatment layer 4 on the surface of the insulating layer, which is excellent in heat radiation and non-adhesive properties.

According to the first means of the present invention, a glass fiber cloth made of woven glass fibers made of E glass having excellent electrical properties such as electrical insulation and 1Iit electric HE is used, and this cloth is made of a series.
Glass fiber and silicone are impregnated with resin and molded.
1 resin is strongly bonded like a fiber-reinforced composite.

For this reason, the insulating layer made of the glass fiber rim X of the present invention has been conventionally used as an insulating layer.1. : It has superior mechanical strength and electrical properties compared to mica plates or ceramic vapor impregnated with an inorganic adhesive.

In addition, since it uses an insulating layer made of glass fiber woven glass with excellent mechanical strength, there is no need to hold it down with a metal plate as with conventional mica heaters, and the temperature of the heater increases. The rise is extremely continuous.

In addition, by using a heating element made of metal foil as a heating element, it is possible to create an extremely thin sheet-like planar heating element, and a ribbon-shaped heating wire is attached to a molded body made by hardening and molding glass fiber cloth with silicone resin in advance. Wrap around the heating element.
j' It #! By using the provided heat generating part, it is possible to produce a planar heat generating element with excellent adhesion between the heat generating part and the insulating layer.

Special I, ゛, the heating part of the latter name is the heating element 9. ! 7. The one used in 1 and 2 is hi, and the insulating layer and the silicone resin of the heat generating part are closely bonded, increasing the adhesion 11 and increasing the mechanical strength 5, J Also, this ( By hot-pressing the semi-hardened σ) silicone resins, they can be cured.

By such a process, it is possible to obtain an inexpensive planar heating element that has a quick temperature change and excellent mechanical strength and electrical durability.

On the other hand, according to the second means of the present invention, it can be easily obtained by forming a surface treatment layer excellent in heat radiation and non-adhesive properties on the surface of an insulating layer made of woven glass fiber.

As a result, by using far-infrared single-ray radiation, it is possible to provide features not found in conventional mica heaters, such as more efficient heating and the ability to easily remove stains from food.

In particular, since it is integrated with silicone resin, it has excellent adhesion to silicone resin-based surface treatment materials, and commercially available surface treatment materials can be used, making it possible to perform the treatment at a relatively low cost.

EXAMPLES Hereinafter, specific examples will be described based on the accompanying drawings.

(Example 1) As shown in Fig. 1, between two insulating layers 1a and 1b made of glass fiber cloth (industrial glass cloth standard 3726 style) made of woven glass fibers manufactured using E-glass. Sheet-like heating element 2 made of 5US430
The insulating layers 1a and 1b made of the glass fiber cloth were impregnated with silicone resin (methyl silicone varnish) and integrated by hot pressing to create a planar heating element of the present invention.

Comparative evaluation of the sheet heating element of the present invention produced in this manner and a conventional mica heater in terms of temperature rise 1 mechanical strength and electrical properties showed that the sheet heating element of the present invention had superior properties in all items. showed that.

In particular, the temperature rise was very fast compared to a mica heater without a metal plate pressed against it, and the temperature rise rate was about twice that of a mica heater with a metal plate pressed against it.

(Example 2) As shown in Fig. 2, a ribbon is attached to a molded body 11 made by hardening and molding a glass fiber cloth (industrial glass cloth standard 3726 style) with silicone resin, which is made by knitting glass fibers manufactured using E-glass. A heating element 12 made of a shaped heating wire was wound around the heating element 13 to prepare a heating section 13.

The heat generating part 13 prepared in this manner is placed between two insulating layers 14a and 14b made of glass fiber cloth in the same manner as in Example 1, and a silicone resin (methyl silicone varnish) is applied to the insulating layers 14a and 14b. impregnated with
The planar heating element of the present invention was created by integrating them by hot pressing.

The above planar heating element of the present invention was also evaluated in the same manner as in Example 1 in terms of temperature rise 2, mechanical strength and electrical properties compared with the conventional mica heater. showed superior characteristics.

In particular, the mechanical strength is significantly increased compared to conventional mica heaters.

(Example 3) As shown in Fig. 3, a glass fiber cloth (industrial glass cloth standard 3726 style), which is made by knitting glass fibers manufactured using E-glass, is hardened and molded with silicone resin, and a ribbon is attached to the molded body 11. A heating element 12 made of a shaped heating wire was wound around the heating element 13 to prepare a heating section 13.

The heat generating part 13 prepared in this manner is placed between the two insulating layers 14a and 14b made of glass fiber cloth in the same manner as in Example 1, and silicone resin (methyl silicone varnish) is applied to the insulating layers 14a and 14b. was impregnated with and integrated by hot pressing.

Finally, the insulating layer 14. A silicone paint containing a far-infrared radiation material and fluorine is applied to the surfaces of a and 14b, and baked to form a surface treatment layer 15 with excellent heat radiation and non-adhesive properties, thereby forming the sheet heating element of the present invention. It was created.

When bread was baked using the planar heating element of the present invention produced in this manner, the cooking time was shorter than that using a conventional mica heater.

Furthermore, when baked directly on a sheet heating element, no sticking occurred.

Effects of the Invention As is clear from the above explanation, according to the planar heating element of the present invention, a heating element made of a metal foil or a glass fiber cloth is placed between two insulating layers made of glass fiber cloth. By wrapping a heating element made of a ribbon-shaped heating wire around a molded body cured with silicone resin and placing a prepared heat generating part, and integrating it with silicone resin, the temperature rises quickly and the mechanical strength and electrical properties are improved. 1) Aging 14F, !J and non-adhesion by forming an excellent and inexpensive planar heating element, and by forming a surface treatment R excellent in heat radiation and non-adhesion on the surface of the above insulating layer. Excellent planar heating fl”-
(9゜ to be able to do 9)

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are cross-sectional views of a mountain-shaped heating element according to the embodiment υ) of the present invention.

Claims (2)

[Claims] (1) Between two insulating layers made of glass fiber cloth,
A heating element made of a ribbon-shaped heating wire is wound around a heating element made of a metal foil or a molded body made of glass fiber cloth which has been hardened and molded with silicone resin, and a heat generating part is arranged, and an insulating layer made of the two glass fiber cloths and A planar heating element in which the heating element or heating part is integrated with silicone resin. (2) The planar heating element according to claim 1, wherein a surface treatment layer having excellent heat radiation and non-adhesion properties is formed on the surface of the insulating layer.