JP2001165448A - Method of manufacturing wall surface material of heating cooking appliance and method of manufacturing heating cooking appliance using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a wall surface material having adhesion of a film during processing, self cleaning ability, and deodorizing ability, in the heating cooking appliance, such as an oven and an range. SOLUTION: A method of manufacturing a wall surface material is provided to contain a process wherein press processing is applied by using a base material 13 having a heat resisting film 14 produced by effecting low-temperature baking of paint containing methyl siloxane resin, and hereafter, the heat resisting film 14 is after-heated for hardening. By bringing the methyl siloxane resin into a ceramic state, self-cleaning ability and deodorizing ability are provided for the heat resisting film 14. Further, in this manufacturing method, since there is no need for washing, degreasing, and painting, the generation of waste, such as paint dust and waste liquid, is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as a microwave oven and a microwave oven, and more particularly to a method for producing a wall material of a cooking device having self-cleaning properties and deodorizing properties.

[0002]

2. Description of the Related Art Conventionally, a stainless steel plate or a plated steel plate has been used as a wall material in an oven chamber of a heating cooker of this type. This will be described below with reference to the drawings.

FIGS. 8 and 9 are a side sectional view and a front sectional view of an electric heating cooker which is a conventional heating cooker. As shown in FIGS. 8 and 9, an object to be cooked or the like is accommodated in the storage of the heating chamber 1, and the heating means 2 mainly performs electric heating. A heat insulating layer 4 is provided between the heating means 2 and the body 3.
Below the lower heating means 2, a bottom plate 5
Is provided, and a back plate 6 is provided on the rear side of the heating chamber 1. A heat-resistant coating 7 is provided on the bottom surface of the heating chamber 1 and has performance such as self-cleaning property and deodorizing property. A door 8 is provided at an opening of the heating chamber 1. In addition, a turntable 9 and a dish tray 10 are used for placing articles to be cooked. The heat-resistant coating 7 is obtained by pressing, processing, washing, coating, and heating and curing a stainless steel plate.

FIG. 10 is a side sectional view of a microwave oven which is a conventional heating cooker, and FIG.
1 is shown. 10 and 11 are substantially the same as those in FIGS. 8 and 9, and the description thereof will be omitted by using the same reference numerals. The difference is that the microwave oven shown in FIGS. 10 and 11 is provided with a high-frequency heating device 11 for generating microwaves. However, the high-frequency heating device 11 is not shown in FIG.

Since the temperature of the side wall surface of a microwave oven or the like is usually 300 ° C. or lower, a non-adhesive film made of a fluororesin has been used in some cases. Since the bottom surface and the top surface have a heating device such as a heater, the wall surface temperature may exceed 400 ° C., so that a fluorine-based resin film cannot be used, and a heat-resistant film such as a siloxane-based resin is used. Was.

Conventionally, in a heating cooker such as a microwave oven, a wall material of a heating chamber having a self-cleaning property and a deodorizing property has been obtained by pressing a stainless steel plate or a plated steel plate, painting and heat-curing. . In particular, the self-cleaning property makes it easy for the user to clean the adhered matter by burning off the oil at a temperature of about 400 ° C. or more when the oil or the like from the cooked substance adheres to the wall surface of the heating chamber of the heating cooker. For example, after oil adheres to a self-cleaning coating film, the temperature is raised to a temperature of about 400 ° C.
If the oil is exposed for a long time, the oil is decomposed and becomes hydrocarbons, carbon dioxide, water, or the like, and a small amount of soot-like matter may remain. However, since almost no residue remains, cleaning work can be omitted. The deodorizing property is to absorb or decompose the odor generated in the heating chamber of the heating cooker to reduce the odor in the heating chamber.

Next, the prior art relating to the adhesion of the heat-resistant coating 7 will be described.

[0008] As disclosed in Japanese Patent Publication No. 61-59399, a technique for producing a stainless steel having excellent coating adhesion is as follows: a temperature of 7.5 to 85.5 ° C and a concentration of 0.5 to 23.5 weight. % Ferric chloride aqueous solution with a current of 0.7 to 18.8 A / cm ^{2 at} a direct current of 1 to 30 using stainless steel as an anode.
After conducting the electrolysis, the current is turned off, and then the steel is immersed in an aqueous ferric chloride solution having a temperature of 7 to 67 ° C and a concentration of 1.9 to 26.4% by weight to obtain a stainless steel having excellent adhesion of the coating. A method for producing a stainless steel having excellent coating adhesion is disclosed in Japanese Patent Publication No. 62-1987.
As shown in Japanese Patent No. 11080, after electrolysis with a direct current having a current density of ^{20 to} 100 mA / cm ² using stainless steel as an anode in a 0.02 to 2.0% by weight aqueous sodium chloride solution, In an aqueous solution containing 2 wt% sodium chloride and 0.03 to 3.0 wt% hydrochloric acid, the surface of the stainless steel was pitted by electrolysis with a direct current having a current density of ^{20 to} 100 mA / cm ² again using stainless steel as an anode. After that, the surface of the non-pitted portion is roughened by a chemical surface corrosion method or a mechanical surface polishing method, or a thin oxide film layer is formed on the surface by a short-time heating method in various high-temperature atmospheres. A method for obtaining a stainless steel having excellent properties is disclosed.

[0009]

However, in a cooking device such as a microwave oven or a microwave oven as described above, the coating film is heated after applying a coating on a base material such as a stainless steel plate machined by a press or the like. By curing
The wall material of the heating chamber with self-cleaning and deodorizing properties was formed. In this method, a flat stainless steel plate is processed by press working or the like, and thereafter, the paint is usually applied through a washing or degreasing process in order to remove press oil or the like remaining on the surface, and then heat-cured. . In such conventional processes, processes such as cleaning, degreasing, painting, and heat curing must be performed after the pressing process, so the number of processing steps increases, and a large amount of water, chemicals, energy, etc. is used for cleaning, degreasing, heating, etc. However, there is a problem that waste treatment such as dust and waste liquid such as washing and painting is required.

[0010] As described in the above-mentioned publication, the performance with excellent adhesion of the coating is achieved by forming the surface of the coating and the base material of stainless steel by forming a rough surface having a large number of fine pores by electrolysis. A configuration has been conceived in which the so-called anchor effect of providing a physical hook between the steels to enhance the adhesion is provided. However, even if the wall material having such a configuration is used, it cannot be used as a wall material for a heating cooker that achieves both the adhesion of the coating during processing and the self-cleaning property and the deodorizing property.

[0011] The present invention solves the above-mentioned problems, and provides a method of manufacturing a heating cooker having a wall material that achieves both the adhesion of a coating during processing and self-cleaning and deodorizing properties. It is an object of the present invention to eliminate washing, degreasing, and painting after press working, and to suppress generation of waste such as paint dust and waste liquid.

[0012]

In order to solve the above-mentioned problems, a method of manufacturing a heating cooker according to the present invention comprises applying a coating material to a base material, firing the coating material at a low temperature, performing machining, and then heating the heat-resistant coating. By curing, the heat-resistant coating is provided with self-cleaning properties and deodorizing properties.

According to the present invention, the coating film at the time of processing is semi-cured by calcination at a low temperature by the above-mentioned production method, so that it has flexibility and does not impair the adhesion to the substrate. Further, since cleaning, degreasing, and painting are not required after machining, there is an effect of suppressing generation of waste such as paint dust and waste liquid.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a method for manufacturing a wall material of a cooking device, comprising: a step of applying a paint to a base material; a step of pre-curing the paint; It consisted of the steps of machining the material and then heat curing the coating.

Thus, since the coating film is fired at a low temperature in the pre-curing stage and has a flexibility in a semi-cured state, it can withstand post-processing such as machining.

According to a second aspect of the present invention, a base material having a heat-resistant coating obtained by baking a coating material containing a siloxane-based resin at a low temperature is subjected to press working, followed by heating and post-heating and curing the heat-resistant coating. Thus, a self-cleaning property and a deodorizing property are imparted to the heat-resistant coating.

According to the present invention, it is possible to provide a method of manufacturing a wall material which achieves both the adhesion of a coating during processing and the self-cleaning and deodorizing properties after post-curing by the above-described manufacturing method. Since there is no painting process after pressing a painted flat plate at the time of manufacturing, energy can be saved during production compared to the case where there is a conventional post-painting process, and the generation of waste such as painting dust and waste liquid is suppressed. effective.

According to a third aspect of the present invention, in addition to the first and second aspects, the substrate is roughened. Thereby, the adhesion of the coating film is improved.

According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the surface of the substrate is roughened by providing a large number of irregularities by chemical etching. Things. Thereby, the adhesion of the coating film is improved.

The invention described in claim 5 is the first invention.
In addition to the invention described in any one of (4) to (4), a metal substrate having a nonmagnetic material surface is used as the substrate.

Thus, the high frequency heating efficiency can be increased as compared with the case where a ferromagnetic metal base material is used.

The invention described in claim 6 is the same as the invention in claim 5
And an aluminum-plated steel plate as a substrate.

Thus, the high-frequency heating efficiency can be increased as compared with the case where a ferromagnetic metal base material is used.

[0024] Further, the invention described in claim 7 is based on claim 1.
7. A heating cooker is manufactured using the wall material of the invention described in any one of the above items 6 to 6. Thereby, the manufacturing process of the heating cooker can be simplified.

[0025]

An embodiment of the present invention will be described below with reference to the drawings. The case where an electric heating device and a high-frequency heating device are used as the heating means will be described.

(Embodiment 1) FIG. 1 is a sectional view of a wall member of a heating chamber used in a heating cooker according to a first embodiment of the present invention.

FIGS. 2 and 3 are a side sectional view and a front sectional view, respectively, of a cooking device using the wall material of this embodiment on the bottom surface of the heating chamber.

As shown in FIG. 1, the wall material 12 has a structure in which a heat-resistant coating 14 is provided on the surface of a metal plate (base material). In this embodiment, the metal plate 13 is made of stainless steel SUS4.
30 [No. 2D finishing: finishing defined in JIS G0203 steel term (product and quality), hereinafter abbreviated as 2D]. As the heat-resistant coating 14, a methylsiloxane-based paint capable of imparting self-cleaning properties was used. In addition, as a material imparting self-cleaning properties, a siloxane-based resin such as an ethylsiloxane-based resin or a butylsiloxane-based resin may be used in addition to the methylsiloxane-based resin.

A paint in which a methylsiloxane resin and an inorganic oxide are dispersed is applied to the surface of SUS430 (2D),
Heat-curing was performed at 0 ° C. for 5 minutes to form a heat-resistant film 14, thereby obtaining a wall material 12. The inorganic oxide is iron, copper, manganese,
Chromium, molybdenum oxide and their composite oxides were used.

The paint containing a methylsiloxane resin is 40
When heated and cured at 0 ° C to 550 ° C, it becomes a hard coating film,
Workability is significantly reduced. Therefore, conventionally, after a stainless steel plate is pressed, a coating containing a methylsiloxane-based resin is applied after washing, followed by firing at a high temperature of about 400 ° C. to 550 ° C. By firing at high temperature, the organic components in the paint are decomposed and made closer to ceramic,
It had self-cleaning properties.

On the other hand, in the present invention, by firing at a low temperature of 200 ° C., a large amount of organic components are left in the coating film so that the coating film can withstand post-processing such as press working. It is intended to be provided. Hereinafter, a heating cooker using the wall material of the present embodiment will be described.

The wall material 12 was pressed and used on the bottom of a heating chamber 15 of a microwave oven. The heating chamber 15 is a place where foods and the like are put in a refrigerator and heated. Reference numeral 16 denotes a microwave oven door, which has a function of shielding heat in the refrigerator and a function of suppressing radio wave leakage. A door 16 is provided at an opening of the heating chamber 15, and a heating device 17 is provided above a ceiling surface in the storage of the heating chamber 15 and below a bottom in the storage. Heating device 1
7 includes a tubular heater, a planar heater, and a sheathed heater. In this embodiment, a tubular heater is used. Heating room 15
Between the heating device 17 and the body 18 on the upper surface of the heating chamber 1
A heat insulating member 20 is provided between the heating device 17 and the bottom plate 19 on the lower surface of 5 so that the heat of the heating device 17 is efficiently transmitted to the interior of the heating chamber 15.

As the heat insulating member 20, a metal heat insulating plate, ceramic wool, glass wool, urethane foam, or the like can be used. In this embodiment, a heat insulating material made of ceramic wool and a heat insulating plate made of metal were used. Further, a similar heat insulating member 20 is provided outside the side wall of the heating chamber 15. The back plate 21 and the body 18 and the bottom plate 19 are connected by screws (not shown). The food and the like (not shown) are placed on a plate holder 23 on the turntable 22 and heated.

The heat insulating member 20, the turntable 22
The dish tray 23 is provided as needed, and is not necessarily limited.

The food was heated in the microwave oven at 250 ° C. for 30 minutes without putting the cooked food. This method is called empty baking. At this time, the temperature of the bottom surface of the heating chamber 15 is 400 ° C.
Crossed. However, the heat-resistant coating of this example did not cause any damage.

With the wall material 12 of this example, the adhesion of the coating film was evaluated before the heat treatment after the press working. A 100 mm 1 × 10 mm square cut was made on the coating film by a cutter knife, and then a cellophane tape was attached to the coating film, and a test for rapidly peeling off was performed (cross cut tape test).
No coating film remained, and the adhesion was good.

When the curing by heating after press working is referred to as post-heating curing, the adhesion of the coating film after the post-heating curing was evaluated by a similar test. It was also good after heat curing.

Further, when the wall material 12 of the present embodiment was subjected to an overhanging process of 2 mm by an Erichsen tester, the coating film was in close contact, and a cellophane tape was applied and a test was conducted for rapid peeling. Also, the coating film did not peel off.

The temperature range for baking the heat-resistant coating 14 at a low temperature is preferably 160 ° C. to 230 ° C. At a temperature of 160 ° C. or less, the hardness of the coating film at the time of baking at a low temperature was low, resulting in insufficient curing.

If the temperature is higher than 230 ° C., the heat-resistant coating 14 is hardened and the workability is lowered, and the adhesion after the processing is lowered. Workability such as press working can be maintained by such low-temperature firing.

Further, after the wall material 12 is pressed,
The self-cleaning performance and the deodorizing performance in the case of post-curing at 00 ° C. for 20 minutes were evaluated.

The self-cleaning performance of the heat-resistant coating 14
5 μl of salad oil was dropped on the surface of the sample, and left at 400 ° C. for 1 hour. The wall material 12
In the case of (1), the seizure remained before the post-heating and curing after the press working, but the seizure did not remain after the post-heating and curing.

The deodorizing performance is 70 in a 200 ml glass container.
A wall material 12 having a heat-resistant coating 14 having a size of × 50 × 0.5 mm is put therein, 5 μl of a 3% aqueous solution of trimethylamine is put therein, sealed, and heated at 100 ° C. for 5 minutes.
After the aqueous solution was gasified, the mixture was allowed to cool at room temperature for 15 minutes, and the residual concentration was measured with an amine detector tube.

Before post-heating and curing the heat-resistant coating 14,
The residual concentration was 120 ppm with respect to the initial concentration of trimethylamine of 285 ppm. This decrease is considered to be due to the effect of being adsorbed on the surface of the glass container and the front and back surfaces of the wall material 12. On the other hand, when measured after the heat-resistant coating 14 was heated and cured after 400 ° C. for 20 minutes, it was found that the residual concentration was 10 ppm with respect to the initial concentration of 285 ppm, which was lower than that before the post-heat curing.

As described above, the self-cleaning performance and the deodorizing performance can be obtained by post-heating and curing the heat-resistant coating 14.

Before the microwave oven is normally used, an operation of baking is performed to remove press oil and the like remaining in the internal parts. This empty baking means that heating is usually performed at the maximum temperature of the oven temperature of the microwave oven for about 20 minutes. As a result, the press oil or the like adhering to the internal components of the microwave oven is thermally decomposed or vaporized and removed, so that there is an effect of suppressing the generation of smoke and smell when the press oil is burned during subsequent use. By this baking, the surface temperature of the heat-resistant coating 14 of the present embodiment becomes about 400.
The self-cleaning performance and the deodorizing performance are exhibited at a temperature exceeding ℃.

[0047] Therefore, self-cleaning performance and deodorizing performance can be obtained even by baking with a heating device of a microwave oven after pressing, so that there is no need for separate heating.
The effect of saving energy is obtained.

Note that the same effect can be obtained by processing using mechanical processing such as bending or extrusion other than press processing.

Needless to say, self-cleaning performance and deodorizing performance can be obtained even if post-heating and curing are performed by separately heating the bottom surface of the heating chamber of the microwave oven without performing post-heating and curing by empty baking.

(Embodiment 2) FIG. 4 is a sectional view of a wall member of a heating chamber used in a heating cooker according to a second embodiment of the present invention.

The microwave oven using the wall material of this embodiment on the bottom surface of the heating chamber has the same configuration as that of the first embodiment, and will be described with reference to FIGS.

As shown in FIG. 4, the wall material 24 has a structure in which a roughened layer 26 is provided on the surface of a metal plate 25 as a base material, and a heat-resistant coating 27 is provided thereon. In this embodiment, stainless steel plate SUS430 (2D) is used as the metal plate 25. As the heat-resistant film 27, a methylsiloxane-based paint was used.

The surface of SUS430 (2D) was heated at a temperature of 40
SUS43 in an aqueous solution of ferric chloride having a concentration of 10% by weight.
Electrolysis was performed for 10 minutes with a direct current having a current density of 9 A / cm ^{2 using} 0 as an anode, and then the current was turned off, and the surface was roughened by immersion in a ferric chloride aqueous solution having a concentration of 10% by weight at a temperature of 40 ° C. Such a method is called chemical etching. On the roughened surface, small pores of about 1 μm are formed on the entire surface. A coating material in which a methylsiloxane resin and an inorganic composite oxide are dispersed is applied to the surface, and cured by heating at 200 ° C. for 5 minutes. The coating 27 was formed, and the wall material 24 was obtained. As the inorganic composite oxide, an oxide of iron, copper, manganese, chromium, and molybdenum and a composite oxide thereof were used.

According to the present invention, by baking at a low temperature of 200 ° C., a large amount of organic components remain in the coating film so that it can withstand post-processing such as press working, and after the processing, self-cleaning properties are imparted by post-heating. It is like that.
Hereinafter, a heating cooker using the wall material of the present embodiment will be described.

The wall material 24 was pressed and used on the bottom of the heating chamber 15 of the microwave oven. Since the configuration is the same as that of the first embodiment, the description is omitted.

With the wall member 24 of this example, the adhesion of the coating film was evaluated before the heat treatment after the press working. A 100 mm 1 × 10 mm square cut was made on the coating film by a cutter knife, and then a cellophane tape was attached to the coating film, and a test for rapidly peeling off was performed (cross cut tape test).
No coating film remained, and the adhesion was good.

When a 6 mm overhang process was performed on the wall material 24 of the present embodiment using an Erichsen tester, the coating film was in close contact with the wall material 24. Also, the coating film did not peel off. In the first embodiment in which the roughened layer 26 was not provided, the adhesion of the coating film was improved, compared to the up to 2 mm overhang processing by the Erichsen tester.

When the curing by heating after press working is referred to as post-heating curing, the adhesion of the coating film after the post-heating curing was evaluated by a similar test. The adhesion was maintained even after post-heating and curing.

The temperature range of the low temperature baking of the heat-resistant coating 27 is suitably 160 ° C. to 230 ° C. If the temperature is lower than 160 ° C., the hardness of the coating film at the time of low temperature baking is low and the curing is insufficient.

If the temperature is higher than 230 ° C., the heat-resistant coating 30 is hardened and the workability is lowered, and the adhesion after the processing is lowered. Workability such as press working can be maintained by such low-temperature firing.

Further, after the wall material 24 is pressed,
When post-curing for 20 minutes at 00 ° C., the self-cleaning performance and the deodorizing performance were evaluated.

The self-cleaning performance of the heat-resistant coating 27
5 μl of salad oil was dropped on the surface of the sample, and left at 400 ° C. for 1 hour. The wall material 24
In the case of (1), the seizure remained before the post-heating and curing after the press working, but the seizure did not remain after the post-heating and curing.

The deodorizing performance was 70 in a 200 ml glass container.
A wall material 24 having a heat-resistant coating 27 having a size of × 50 × 0.5 mm is put therein, 5 μl of a 3% aqueous solution of trimethylamine is put therein, sealed, and heated at 100 ° C. for 5 minutes.
After the aqueous solution was gasified, the mixture was allowed to cool at room temperature for 15 minutes, and the residual concentration was measured with an amine detector tube.

Before post-heating and curing the heat-resistant coating 27,
The residual concentration was 118 ppm with respect to the initial concentration of trimethylamine of 285 ppm. This decrease is considered to be due to the effect of being adsorbed on the surface of the glass container and the front and back surfaces of the wall member 24. On the other hand, when measured after the heat-resistant coating 27 was heated and cured after 400 ° C. for 20 minutes, it was found that the residual concentration was 11 ppm with respect to the initial concentration of 285 ppm, which is lower than that before the post-heat curing.

As described above, the self-cleaning performance and the deodorizing performance were obtained by heat-curing the heat-resistant coating 27.

When the adhesion of the coated film after the roughening treatment was carried out by sandblasting was evaluated, when the film was overhanged by 6 mm using an Erichsen tester, a part of the coated film was peeled off. However, when a 4 mm overhang process was performed, they adhered to each other, and the coating film was not peeled off even when a cellophane tape was applied and a test for rapidly peeling off was performed. Therefore, even by sandblasting, the size of the overhang at the time of pressing can be adjusted to be used for the bottom of the heating chamber of the microwave oven.

The surface roughening treatment was performed by a polishing treatment using a polishing roll. No. of SUS430 4 finish [No. No. 4 Finish: Finish specified in JIS G0203 steel term (product and quality). Abbreviated as 4]
And HL finish [HL finish: Finish specified in JIS G0203 steel term (product and quality), hereinafter abbreviated as HL] When the adhesion after similar processing is tested on a coating film using an Erichsen tester, And the adhesion after post-heating and curing was good. Therefore, it is also possible to use it on the bottom of the heating chamber of the microwave oven by adjusting the size of the overhang at the time of pressing even by the polishing process using the polishing roll.

The stainless steel sheet No. In addition to one-way polishing such as 4 finishing and HL finishing, the surface may be polished vertically and horizontally to be roughened.

The substrate is not limited to a stainless steel plate, but may be an aluminum-plated steel plate, an aluminum-zinc alloy-plated steel plate, or another alloy steel.

(Embodiment 3) FIG. 5 shows a sectional view of a wall member of a heating chamber of a heating cooker according to a third embodiment of the present invention.

FIG. 6 is a side sectional view and FIG. 7 is a front sectional view of a microwave oven which is a cooking device using the wall material of the present embodiment on the bottom of a heating chamber.

As shown in FIG. 5, the wall material 28 has a structure in which a heat-resistant coating 30 is provided on the surface of an aluminum-plated steel plate 29 which is a metal base material. In this embodiment, a heat-resistant aluminum-plated steel sheet containing 8% silicon in the plating layer was used as the aluminum-plated steel sheet.

A heat-resistant aluminum-plated steel sheet containing 8% silicon is coated with a coating material in which a methylsiloxane resin and an inorganic oxide are dispersed and heated and cured at 200 ° C. for 5 minutes to form a heat-resistant film 30. The wall material 28 was obtained. The inorganic oxide was selected from oxides of iron, copper, manganese, chromium, and molybdenum and composite oxides thereof.

In this embodiment, by firing at a low temperature of 200 ° C., a large amount of organic components are left in the coating film so that the coating film can withstand post-processing such as press working. It is something to do. Hereinafter, a heating cooker using the wall material of the present embodiment will be described.

The wall material 28 was pressed and used on the bottom of the heating chamber 31 of the microwave oven. The heating chamber 31 is a place where foods and the like are put in a refrigerator and heated. Reference numeral 16 denotes a microwave oven door, which has a function of shielding heat in the refrigerator and a function of suppressing radio wave leakage. Door 1 in opening of heating chamber 31
6 are provided, and a heating device 17 is provided above a ceiling surface inside the storage of the heating chamber 31 and below a bottom inside the storage. Heating device 17
Examples thereof include a tubular heater, a planar heater, and a sheathed heater. In this embodiment, a tubular heater is used. Between the heating device 17 and the body 18 on the upper surface of the heating chamber 31 and the heating chamber 31
Between the heating device 17 and the bottom plate 19 on the lower surface of the
0 is provided so that the heat of the heating device 17 is efficiently transmitted to the interior of the heating chamber 31. A high-frequency heating device 32 for generating microwaves was provided at the rear of the heating chamber 31. The high-frequency heating device is used when heating a food or the like by radio waves.

As the heat insulating member 20, a metal heat insulating plate, ceramic wool, glass wool, urethane foam, or the like can be used. In this embodiment, a heat insulating material made of ceramic wool and a heat insulating plate made of metal were used. Further, a similar heat insulating member 20 is provided outside the side wall of the heating chamber 31. The back plate 21 and the body 18 and the bottom plate 19 are connected by screws (not shown). The food and the like (not shown) are placed on a plate holder 23 on the turntable 22 and heated.

The heat insulating member 20, the turntable 22
The dish tray 23 is provided as needed, and is not necessarily limited.

The food was heated at 250 ° C. for 30 minutes without putting the food in the microwave oven. This method is called empty baking. At this time, the temperature of the bottom surface of the heating chamber 31 is 400 ° C.
Crossed. However, the heat-resistant coating of this example did not cause any damage.

With the wall material 28 of this example, the adhesion of the coating film was evaluated before the heat treatment after the press working. A 100 mm 1 × 10 mm square cut was made on the coating film by a cutter knife, and then a cellophane tape was attached to the coating film, and a test for rapidly peeling off was performed (cross cut tape test).
No coating film remained, and the adhesion was good.

When the curing by heating after press working is referred to as post-heating curing, the adhesion of the coating film after the post-heating curing was evaluated by a similar test. It was also good after heat curing.

Further, when the wall material 28 of the present embodiment was subjected to an overhanging process of 4 mm by an Erichsen tester, the coating film was in close contact, and a cellophane tape was applied and a test was conducted for rapid peeling. Also, the coating film did not peel off.

The temperature range of the low-temperature baking of the heat-resistant coating 30 is suitably from 160 ° C. to 230 ° C. If the temperature is lower than 160 ° C., the hardness of the coating at the time of the low-temperature baking becomes low, resulting in insufficient curing.

If the temperature is higher than 230 ° C., the heat-resistant coating 30 is hardened and the workability is lowered, and the adhesion after the processing is lowered. Workability such as press working can be maintained by such low-temperature firing.

Further, after the wall material 28 is pressed,
When post-curing for 20 minutes at 00 ° C., the self-cleaning performance and the deodorizing performance were evaluated.

The self-cleaning performance of the heat-resistant coating 30
5 μl of salad oil was dropped on the surface of the sample, and left at 400 ° C. for 1 hour. The wall material 28
In the case of (1), the seizure remained before the post-heating and curing after the press working, but the seizure did not remain after the post-heating and curing.

The deodorizing performance was 70 in a 200 ml glass container.
A wall material 28 having a heat-resistant coating 30 having a size of × 50 × 0.5 mm is put therein, 5 μl of a 3% aqueous solution of trimethylamine is put therein, sealed, and heated at 100 ° C. for 5 minutes.
After the aqueous solution was gasified, the mixture was allowed to cool at room temperature for 15 minutes, and the residual concentration was measured with an amine detector tube.

Before post-heating and curing the heat-resistant coating 30,
The residual concentration was 120 ppm with respect to the initial concentration of trimethylamine of 285 ppm. It is considered that this decrease is due to the effect of being adsorbed on the surface of the glass container and the front and back surfaces of the wall material 13. On the other hand, when measured after the heat-resistant coating 30 was heated and cured after 400 ° C. for 20 minutes, it was found that the residual concentration was 10 ppm with respect to the initial concentration of 285 ppm, which was lower than that before the post-heat curing.

As described above, it can be seen that the self-cleaning performance and the deodorizing performance can be obtained by post-heating and curing the heat-resistant coating 30.

When high-frequency heating was performed in the microwave oven of this example, the high-frequency heating efficiency was improved.

[0091] Two 1000 ml glass beakers
When 1000 ml of water at 1000 ° C. and 2000 ml each were added and high-frequency heating was performed, it took 2 minutes and 48 seconds when using ferritic stainless steel SUS430 to bring the water temperature to 20 ° C., but it was 2 minutes and 43 seconds in this embodiment. About 15 by electricity
W efficiency improved.

This is made of ferritic stainless steel SUS4
In the case of 30, since it is a magnetic material, in the case of high-frequency heating,
It is considered that magnetic loss occurred on the surface and heating efficiency was low due to energy consumption.

In this embodiment, a heat-resistant aluminum-plated steel sheet containing 8% silicon is used. However, other metal base materials having a non-magnetic base material surface can be used.

The base material surface is a non-magnetic material, for example, in the case of a high frequency of 2.45 GHz, since the skin depth of the radio wave is from several μm to several tens μm of the metal surface, so Has low penetration of radio waves. Therefore, it is considered that the magnetism of the steel as the base material of the aluminum-plated steel sheet hardly affected the high-frequency heating efficiency.

SUS30 of austenitic stainless steel
In the case of using No. 4, a ferritic stainless steel SUS
High-frequency heating efficiency was able to be improved as compared with the case where 430 was used.

The same effect can be obtained by using a clad material in which a nonmagnetic metal such as aluminum or titanium is clad with iron or stainless steel.

[0096]

As described above, according to the first to seventh aspects of the present invention, the wall material having the self-cleaning property and the deodorizing property after the post-heating and curing maintains the adhesion of the coating during processing. It is possible to provide a production method of the present invention, and it is possible to suppress the generation of waste in the cleaning process and the coating process by eliminating the need for the cleaning process and the coating process after press working as in the related art. Was.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wall member of a heating chamber of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the cooking device.

FIG. 3 is a front sectional view of the cooking device.

FIG. 4 is a sectional view of a wall member of a heating chamber of a heating cooker according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a wall material of a heating chamber of a heating cooker according to a third embodiment of the present invention.

FIG. 6 is a side sectional view of the cooking device.

FIG. 7 is a front sectional view of the cooking device.

FIG. 8 is a side sectional view of a conventional cooking device.

FIG. 9 is a front sectional view of the cooking device.

FIG. 10 is a side sectional view of another conventional cooking device.

FIG. 11 is a front sectional view of the cooking device.

[Explanation of symbols]

 12 Wall material 13 Metal plate (base material) 14 Heat resistant coating 24 Wall material 25 Metal plate (base material) 26 Roughened layer 27 Heat resistant coating 28 Wall material 29 Aluminum plated steel plate 30 Heat resistant coating

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F24C 14/00 F24C 14/00 A 15/00 15/00 B H05B 6/64 H05B 6/64 DF term (reference) 3K090 AA06 AB18 BB02 3L086 AA01 BB03 BB14 DA09 DA30 3L087 AA01 AC07 DA09 DA30 4D075 BB66X CA34 CA45 DA06 DB07 DC18 EB42

Claims (7)

[Claims] 1. A heating cooker comprising a step of applying a paint to a substrate, a step of pre-curing the paint, a step of machining the pre-cured substrate, and a step of heat-curing the coating thereafter. Of manufacturing wall materials. 2. A base material having a heat-resistant coating obtained by baking a coating material containing a siloxane-based resin at a low temperature is pressed, and then the heat-resistant coating is post-heat-cured to ceramicize the siloxane-based resin. A method for producing a wall material of a heating cooker, comprising a step of imparting self-cleaning properties and deodorizing properties to a coating. 3. The method according to claim 1, wherein the base material is roughened. 4. The method for manufacturing a wall material of a heating cooker according to claim 1, wherein a substrate having a plurality of irregularities formed by chemical etching and having a roughened surface is used. 5. The method for producing a heating cooker according to claim 1, wherein a metal substrate having a nonmagnetic material surface is used as the substrate. Method. 6. The method according to claim 5, wherein an aluminum-plated steel plate is used as the base material. 7. A method of manufacturing a heating cooker manufactured based on the method of manufacturing a wall material of a heating cooker according to any one of claims 1 to 6.