JPH04121A - Door of oven range - Google Patents

Abstract

PURPOSE:To prevent white powder of an outermost glass plate from being adhered to the backside thereof and keep a transparent characteristic of the glass plate by a method wherein a heat-resistant film composed of specific copolymer is replaced with glass and a heat-resistant sealed layer is applied to the surface of porous metal. CONSTITUTION:A heat-resistant film 8 of copolymer of tetrafluoroethylene and parfluoroalkylvynilether is corona discharged on the entire inner surface of a porous metallic plate 4 so as to enable its one side surface to be adhered, a silicon resin adhesive agent is applied on a processed surface and applied to the metallic plate 4, so that that it is not necessary to fix a glass plate. Accordingly, the structure of door is simplified, its assemblying operation is easy to perform and its manufacturing cost can be reduced. Heat-resistant coating is applied from the porous metallic plate 4. A sealed layer 9 is formed with a heat-resistant coating at a surface formed by the metallic plate 4 and the film 8 opposing to the porous portions of the metallic plate 4, resulting in that even under a high temperature of 270 deg.C to 300 deg.C, white powder smoke is not generated at the silicon resin adhesive agent and a transparent characteristic of the glass plate 6 can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a door for a microwave oven equipped with an oven function.

[Problems to be solved by conventional techniques and inventions] Generally,
The door of a microwave oven is equipped with a glass plate on the outermost side and a porous metal plate on the inside in order to prevent the generated radio waves from being emitted to the outside and to allow the inside to be seen through. Furthermore, a glass plate is placed inside the metal plate to prevent it from being contaminated by steam, mist, or smoke from the contents being cooked.

However, it is not easy to arrange the glass plate on the innermost side, and the structure becomes complicated, resulting in a problem that assembly is complicated. For microwave ovens that do not have an oven function, it is possible to attach a polyester film coated with an acrylic adhesive to the inside of the metal plate to provide the function of preventing dirt. However, because the film lacks heat resistance, it could not be used in a microwave oven equipped with an oven function, which has a high temperature inside.

Therefore, in a microwave oven with an oven function, if a heat-resistant fluororesin film is used as the film and a heat-resistant silicone resin adhesive is used as the adhesive, it can be used at temperatures up to 250°C. However, in recent years, due to the high performance of microwave ovens, the internal temperature has been reduced to 270°C to 30°C.
There is a tendency for temperatures higher than 0°C.

2. The film was stretched using the silicone adhesive.
When the adhesive is heated to a high temperature of 70°C to 300°C, there is a problem in that white powder smoke is generated from the adhesive, and the white powder adheres to the back side of the outermost glass plate, impeding the transparency of the glass plate. This has gradually become clear as a result of many experiments and studies conducted by the present inventor.

Therefore, an object of the present invention is to solve the above problems.

[Means to solve the problem]

In order to solve the above problems, the present invention applies corona discharge treatment to one side of a film made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether on a porous metal plate provided inside a door body. A silicone resin adhesive is applied and stretched together with the porous metal plate, and a heat-resistant paint is applied from the side of the porous metal plate to form a surface formed by the porous metal plate and the film facing the porous portion of the metal plate. To,
A sealing layer was applied.

[For production]

A film made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether has sufficient heat resistance, so it can be substituted for glass. Therefore, the structure of the door becomes simple and assembly becomes easy. Furthermore, since a heat-resistant paint is applied to the surface formed by the porous metal plate and the film facing the porous portion of the metal plate to form a sealing layer, it can withstand high temperatures of 270" to 300°C. No white powder smoke is generated compared to silicone resin adhesives.

In addition, one side of the film can be bonded by corona discharge treatment, and the other side remains non-adhesive, so even if steam, smoke, etc. generated from the contents adhere to the film, it can be easily removed. can.

[Example] The present invention will be described below based on illustrated embodiments.

FIG. 1 shows a door 1 of a microwave oven according to the present invention, and the door 1 is pivotably attached to a main body 2 of the microwave oven, as in the conventional case.

3 is a metal door body forming the outer frame of the door 1. A porous metal plate 4 (generally called a bunching plate) is provided inside the door body 3, and a glass plate 6 is provided on the front surface 5 to prevent radio waves generated within the range body 2 from being emitted to the outside. Additionally, the interior can be seen through. 7 is a grip part.

Then, as shown in FIGS. 2 and 3, a heat-resistant film 8 is stretched over the entire inside surface of the metal plate 4. One side of the film 8, which is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, is subjected to a corona discharge treatment (to make it adhesive), and a silicone resin adhesive is applied to the treated side, and the metal plate 4 is Paste it on. Then, a heat-resistant paint is applied from the side of the porous metal plate 4 to form a sealing layer 9 on the surface formed by the metal plate 4 and the film 8 facing the porous portions of the metal plate 4.

The thickness of the film 8 is suitably 25 μm to 150 μm. In addition, suitable heat-resistant paints for forming the sealing layer 9 include polyvinylidene fluoride resin solution, polyvinylidene fluoride-tetrafluoroethylene copolymer resin solution, silicone-acrylic resin solution, etc. The dimension t is preferably 10 μm to 50 μm. In the case of the structure described above, the film 8 does not change at all even after repeating the cycle of lowering the temperature from 300°C to room temperature 30 times, white powder smoke is generated from the silicone resin adhesive, and the white powder glass plate There was no adhesion to 6.

It should be noted that the present invention is not limited to the above-described embodiments, and design changes may be made without departing from the gist of the present invention.

〔Effect of the invention〕

Since the present invention is configured as described above, it achieves the remarkable effects described below.

- Since the heat-resistant film 8 is stretched over the entire inside surface of the metal plate 4, there is no need to attach glass as in the past. Therefore, the structure of the door is simplified, assembly is easy, and manufacturing costs can be reduced.

(2) Since the inner surface of the film 8 is non-adhesive, even if steam, smoke, etc. generated from the contents adhere to the film, it can be easily removed.

■ Since the sealing layer 9 was formed with heat-resistant paint, the
Even at high temperatures of .degree. C. to 300.degree. C., the silicone resin adhesive does not generate white powder smoke, and therefore no white powder adheres to the glass plate 6, maintaining the transparency of the glass plate 6.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view showing one embodiment of the present invention, the second is a sectional view of the main part, and FIG. 3 is an enlarged sectional view of the main part. 3... Door body, 4... Porous metal plate, 8... Film, 9... Sealing layer. Patent applicant: Nichiei Kako Co., Ltd. Figure 2 No. 3

Claims (1)

[Claims] 1. On one side of the film 8 made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, one side of the porous metal plate 4 provided inside the door body 3 is subjected to corona discharge treatment and a silicone resin adhesive is applied. Further, a heat-resistant paint is applied from the porous metal plate side, and a sealing layer is applied to the surface formed by the porous metal plate 4 and the film 8 facing the porous portion of the metal plate 4. 9. A door for an oven microwave oven characterized by being coated with the following.