JPS6049815B2 - electric cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device, an electric cooker, an electric cooker, an electric pot, a hot plate, etc., which has an improved coating method for the metal fabric forming the main body or lid of the cooker. .

Conventionally, stainless steel, aluminum, or enamel materials have been used for the open heating chamber of high-frequency heating devices, but these have the drawbacks of high cost and limited color tones.

Therefore, in recent years, paint finishing has been started using materials such as low-cost steel plates, galvanized steel sheets, and aluminum-plated steel sheets, and these coating materials have been put into practical use as low-cost materials with good performance. There are white to cream colored paint films mainly composed of acrylic-melamine resin paints formed by baking to form a coating film of ~60 μm, or acid-cured baked epoxy powder paints of 50±20 μm. However, even among high-frequency heating devices, these microwave ovens with a browner are not practical. In other words, the food contamination heat resistance limit of the current paint-treated open door is only 130 to 1400 C, and when a microwave oven with a browner is opened, the temperature reaches a minimum of 170 to 180 C.
Must be resistant to food contamination. However, for the purpose of providing the product at a low cost, expensive resin paints cannot be used. For example, with fluororesin that is baked in the range of 400 to 500 degrees Celsius, the higher the temperature, the higher the risk of food contamination.
It is meaningless because the cost is no different from that of conventional stainless steel, aluminum, and enamel materials. In addition, fluororesin coatings do not allow for a variety of color tones, and to ensure adhesion, aluminum is used for the fabric, and additional processing such as sandblasting is required to adjust the base material. Moreover, the raw material cost is 5 to m times more expensive than current paints, and the baking time is 4 times higher than that of current paints.
Because of the high temperature of around 00°C, even if the performance is good, it is difficult to use and has little value. The following conditions (1) to (4) are required for the material of the coating film applied to the fabric forming the opening.

(1) The paint film should be difficult to scratch. (2) The ability of current coated products is food contamination resistance of 130 to 1400C, while food contamination resistance of 160C or higher is 2000C. (3) There is little deterioration of the coating film due to discharge.

(For example, even if a part of the coating film becomes black due to electric discharge, it should have good adhesion to the fabric and maintain its corrosion resistance.) (4)
Must be non-flammable or flame-retardant.

Furthermore, as long as painting is carried out, it is necessary to always consider that the general performance of the coating film is good. As seen in the above-mentioned opening of a microwave oven equipped with a browner, the present invention applies an acrylic-melamine resin paint as an undercoat to the fabric forming parts that require high temperature food contamination resistance and heat resistance, and a modified fluorine resin paint as an overcoat. A resin coating is applied to form a resin film on the fabric, ensuring resistance to high-temperature food contamination and heat resistance, and the coating is inexpensive and can be applied to inexpensive fabrics to provide the desired excellent coating performance. Provide electric cookers. Hereinafter, the present invention will be described with reference to the drawings, taking as an example an opening of a microwave oven with a browner.

FIG. 1 is a perspective view of the main body 1 of the microwave oven with a browner in a state where the door 2 is open, and numeral 3 in the figure indicates the opener attached to the browner 8. The inner surface of this open 3 is made of acrylic-melamine resin as an undercoat on a material 4 made of low-cost iron plate, galvanized steel plate, aluminum plated steel plate, etc., which is formed into an open shape as shown in the sectional view of the main part in Fig. 2. membrane 5
A modified fluororesin film 6 is formed as an overcoat so that it is completely covered, so that the surface of the uppermost layer becomes the fluororesin film 7. The finish of Open 3 is as follows.

First, the fabric of iron plate or galvanized steel plate is processed into an open shape. Next, the fabric, which was formed into an open shape, was treated with a base coating, and an acrylic-melamine resin paint (
A mixture of 49% acrylic resin, 14% melamine resin, 25% coloring pigment, and 12% solvent was applied as an undercoat and baked at 150 to 200 degrees Celsius to create an acrylic coating. A melamine resin film 5 is formed.
Next, we applied a low-temperature baking type acrylic-modified modified fluororesin coating [acrylic-modified modification ratio of 20% to 40%].
% of polyvinylidene fluoride resin varnish (for example, Dainippon Paint Co., Ltd.'s trade name 0 Deyufuna #100.51%, pigment 1
8% (white), 1% additive, and 30% solvent were thoroughly kneaded and mixed] as the top coat, and 200 to 2
A modified fluororesin film 6 is formed by baking at 50°C. With the above, the inner surface of the open 3 is coated as desired, and the modified fluororesin film 6 is coated with the fluororesin film 7.
is formed. This two-layer coating film consisting of the acrylic-melamine resin film 5 and the modified fluororesin film 6 is based on the above (1) to (4).
Not only does it meet the following conditions, but it also has unique coating properties as an open coating for Brauner microwave ovens, as shown in the table below. However, the experimental results in the table below are based on S
A PCC (iron plate) and a hot-dip galvanized Fe-Zn alloy plated steel plate were used, and the film thickness was 30 to 40μ7TL (the acrylic-melamine resin film 5 as the undercoat was 10 to 20μ, and the modified fluorine resin film 6 as the topcoat was 20 to 40μ). 2 coats, 2 bakes, white colored (titanium oxide was used as the pigment). In addition, if fluororesin powder is appropriately blended between 2 and 40% in the above acrylic-melamine resin paint and modified fluororesin paint, it is possible to achieve excellent coating performance (abrasion resistance, hardness, scratch resistance). , combustibility, food stain resistance, and ease of stain removal). In addition, although the above example cites an example of surface treatment for the open side of a microwave oven with a browner, it is also possible to treat parts that require high temperature food contamination and heat resistance of electric cookers other than microwave ovens, such as electric pots, hot plate lids, etc. Applicable to surface treatment such as opening of main body and electrical opening.

As described above, according to the present invention, for example, the fabric forming the opening is coated with an acrylic-melamine resin as an undercoat and a modified fluororesin as an overcoat and finished by baking, thereby maintaining the surface properties required for conventional cooking surfaces. In addition, we have created an electric cooker that is low in cost as a whole, can be made of low-cost fabric, can provide high-temperature heat resistance, has excellent openness against food contamination, and can be colored freely by selecting pigments. Can be manufactured.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a microwave oven with a browner according to an embodiment of the present invention, with the door open, and FIG. 2 is an enlarged sectional view of the main parts thereof. 1: Microwave oven body with browner, 3: Oven, 4:
Fabric forming the oven, 5: Acrylic-melamine resin film, 6: Modified fluororesin film.

Claims (1)

[Scope of Claims] 1. An acrylic-melamine resin coating film is formed as an undercoat on a metal fabric that has been subjected to a base treatment to form an oven, an appliance body, a lid, etc., and a modified acrylic film is further modified with a low-temperature baking type acrylic as an overcoat. An electric cooker made of a fluororesin coating. 2 Acrylic-melamine resin coating film is 150℃~200℃
, the modified fluororesin coating film modified with acrylic is heated to 200℃~
The electric cooker according to claim 1, which is baked at 250°C. 3. An acrylic-melamine resin coating film is formed by appropriately blending fluororesin powder as an undercoat on a metal fabric that has been subjected to base treatment to form the oven, equipment body, lid, etc., and further fluororesin powder is appropriately blended as a topcoat. An electric cooker made of a modified fluororesin coating film modified with low-temperature baking acrylic.