JP2001165450A - Heating cooking appliance and method of manufacturing wall surface material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooking appliance to be high in heat efficiency as it has non-adhesion, in the heating cooking appliance, such as an oven range. SOLUTION: A non-adhesion film 12 to hold 50% or more of heat reflectance of the base material of a stainless steel sheet 11 where a surface finish forms a 2D finish is situated on the base material. A heating chamber is formed by using a wall surface material 10 colored by baking the non-adhesion film 12 at 350-420 deg.C. Thus, by making the best use of heat reflection performance of a stainless steel sheet surface and providing non-adhesion, a cooking apparatus is hardly fouled, uniformity in baking distribution of toast and a cookie is improved, and coloring and provision of design performance are practicable.

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 wall material for a heating chamber for improving heating efficiency and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a microwave oven or a microwave oven uses a microwave or a heater as a heating source of an object to be cooked, and an oven toaster uses a heater. As a wall material in the oven, a metal plate such as a stainless steel plate or a plated steel plate or a stainless steel plate or a plated steel plate having a surface coated with a non-adhesive material has been used. With the non-adhesive coating, the wall surface is hardly stained, or the structure is easy to wipe off even if stains arrive.

[0003] Conventional microwave ovens are shown in Figs.
As shown in the figure, the objects to be cooked and the like are stored in the storage of the heating chamber 1,
Heating is mainly performed by the heating means 2, and a heat insulating layer 4 is provided between the heating means 2 and the body 3. A bottom plate 5 is provided below the lower heating means 2 via a heat insulating layer 4, and a back plate 6 is provided behind the heating chamber 1. A door 7 is provided at an opening of the heating chamber 1.
In addition, a turntable 8 and a plate receiving stand 9 are used to place articles to be cooked.

As a technique of imparting heat reflectivity to a coating process on the inner wall surface of a heating chamber, as disclosed in Japanese Patent Application Laid-Open No. Hei 10-2088862, a heat reflective material such as aluminum is mixed in a coating film, A configuration for improving the heat reflectance has been considered. According to the above-mentioned publication, a film in which aluminum powder is mixed into a heat-resistant film, or a heat reflection coefficient of 20%
５０50% of the coating was obtained. In the primer coating film, the aluminum powder was mixed with the top coating film without mixing the aluminum powder, so as to have a reflection performance.

[0005]

However, in the above-mentioned heating cooker such as a microwave oven or a microwave oven, the inside wall surface of the heating chamber 1 is contaminated by oil scattered during cooking or boiled foods. Further, dirt sometimes adhered due to heating or the like. As described above, in the heating chamber 1 made of a metal such as a stainless steel plate, it is difficult to remove dirt such as food.

Therefore, conventionally, non-adhesive coating has been applied to the metal surface of the inner wall surface of the heating chamber 1 shown in FIGS. 6 and 7 in order to easily remove dirt. However, when a non-adhesive coating is applied to the surface of a metal such as a stainless steel plate, dirt is easily removed, but the heat reflectance of the coating film surface is lower than that of the surface of the metal such as a stainless steel plate, There has been a problem that cooking time such as oven cooking and toasting becomes long.

As disclosed in Japanese Patent Application Laid-Open No. Hei 10-2088862, a configuration has been considered in which a heat reflective material such as aluminum is mixed in a coating film to improve the heat reflectance.
Even if a heat-reflective material is mixed in the coating film, the heat reflection performance is limited to about 50 (%), and if the heat reflection performance is further improved, the adhesion of the coating film is reduced. It was unsuitable for practical use.

[0008] The present invention solves the above-mentioned problems, and makes use of the heat reflection performance of the surface of a stainless steel plate, imparts non-adhesiveness to prevent stains, and improves the uniformity of the distribution of toasts and cookies. It is an object of the present invention to provide a heating cooker which is improved and has a colored design.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, a heating cooker according to the present invention is arranged such that a heat-reflecting material having a heat reflection coefficient of 5% is placed on a stainless steel base material having a 2D surface finish.
A non-adhesive coating film having 0% or more is provided.
The heating chamber was constituted by using wall materials colored by firing at 50 ° C. to 420 ° C.

According to the present invention, the above-mentioned constitution makes use of the heat reflection performance of the surface of a stainless steel plate, imparts non-adhesiveness, makes it harder to stain, and improves the uniformity of the distribution of toasts and cookies. It can be colored to impart design properties.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the cooking device of the present invention, a non-adhesive coating film having a heat reflectance of 50% or more of the base material is provided on a stainless steel base material whose surface finish is 2D. A heating chamber was formed using a wall material colored by baking the coating film at 350 ° C. to 420 ° C.

This makes it possible to make use of the heat reflection performance of the metal surface, to impart non-adhesiveness and to make it harder to stain, and to improve the uniformity of the distribution of toasts and cookies to be baked.
There is an effect that it is possible to impart a design by coloring.

[0013] The method for producing a wall material according to the present invention comprises the steps of: providing a non-adhesive coating film having a thermal reflectance of 50% or more on a stainless steel plate having a 2D finish. The step of firing and coloring the coating film at 350 ° C. to 420 ° C. formed a wall material constituting a heating chamber.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The case where an electric heating device is used as the heating means will be described.

(Embodiment 1) FIG. 1 is a sectional view showing a main structure of a wall material used for a heating cooker according to the present invention.

As shown in FIG. 1, the wall material 10 has a structure in which a non-adhesive coating film 12 is provided on the surface of a stainless steel plate 11. In this embodiment, the stainless steel plate 11 is made of stainless steel SUS430 (No. 2D finish: JIS G0).
203 The finish specified in the iron and steel term (product and quality), hereinafter abbreviated as 2D) was used. As the non-adhesive coating film 12, polytetrafluoroethylene (P
(TFE) resin was formed using a coating material in which polyethersulfone (PES) resin and a solvent were dispersed. The paint was applied on a SUS430 (2D) base material of a stainless steel plate 11 and baked at 400 ° C. for 10 minutes to obtain a wall material 10.
As a result, the wall material 10 could be colored gold. By heating SUS430 (2D) at a high temperature of 400 ° C. for 10 minutes, the surface of the stainless steel plate could be colored to a gold color.

The relationship between the thermal reflectance of a substance that does not transmit heat rays such as infrared rays and the thermal absorptivity is [thermal reflectance] = 1- [thermal absorptivity]. Further, since the heat emissivity of a substance is equal to the heat absorption rate of the substance, it can be obtained by measuring the heat emissivity of the substance.

The thermal emissivity is measured by using a simple thermal emissometer ｛DEVI
Room temperature 20-2 using MODEL.AE｝ manufactured by CE & SERVICE Co.
The test was performed in a laboratory at 2 ° C., a humidity of 50 to 70%, and a wind speed of 0.1 m / s or less. At this time, the AC voltage was 100 ± 2 V.
The measurement was performed with the aluminum plate as the lower reference (emissivity 0.04) and the plate provided with the pseudo black body coating on the aluminum plate as the upper reference (emissivity 0.93).

FIGS. 2 and 3 show a microwave oven having a heating chamber wall provided with the non-adhesive coating film 12 of the present embodiment. FIG. 2 is a schematic cross-sectional view of the configuration of the microwave oven according to the present embodiment, and FIG. 3 is a cross-sectional view before the schematic configuration. Heating room 13
Is provided with a non-adhesive coating film 12 on the side surface and the rear surface. 1
Reference numeral 3 denotes a heating chamber of a microwave oven, which is used to heat foods in a refrigerator. A microwave oven door 14 has a function of shielding heat in the refrigerator and a function of suppressing radio wave leakage. A door 14 is provided at the opening of the heating chamber 13, and a heating device 15 is provided above a ceiling surface in the storage of the heating chamber 13 and below a bottom in the storage. Examples of the heating device 15 include a tubular heater, a planar heater, and a sheath heater.
In this embodiment, a tubular heater is used. A heat insulating member 18 is provided between the heating device 15 and the body 16 on the upper surface of the heating chamber 13 and between the heating device 15 and the bottom plate 17 on the lower surface of the heating chamber 13, respectively. So that it can be transmitted efficiently within. As the heat insulating member 18,
A heat insulating plate made of metal, 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 18 is provided outside the side wall of the heating chamber 13. Further, the back plate 19, the body 16 and the bottom plate 17 are connected with screws (not shown).
The food and the like (not shown) are placed on a plate holder 21 on the turntable 20 and heated.

The heat insulating member 18, the turntable 20
The dish tray 21 is provided as needed, and is not necessarily limited.

In the case of SUS430 (2D) of the present invention, the emissivity was 0.07. Therefore, SUS430 (2D)
Has a thermal reflectance of 0.93. This SUS430 (2
In the case where the non-adhesive coating film 12 is provided at 0.05 μm on D), the emissivity of the side surface of the non-adhesive coating film 12 of the wall material 11 is 0.10, and the heat reflectance is 0.90. Was. In this case, the heat reflectance of the wall material 10 provided with the non-adhesive coating film 12 is
When SUS430 (2D) is set to 100% of the reference, the heat reflectance becomes 97%. The thermal reflectance of the wall material 10 having the non-adhesive coating film 12 based on the thermal reflectance of the stainless steel plate 11 is referred to as a relative thermal reflectance.

As shown in Table 1, when the thickness of the non-adhesive coating film 12 is 0.05 μm, the heat reflectance is 9
It was 0%. Since the heat reflectance of SUS430 (2D) in the case of no painting is 93%, the unpainted SUS430 when the thickness of the non-adhesive coating film 12 is 0.05 μm.
The relative thermal reflectance for (2D) is 97%. When the thickness of the non-adhesive coating film 12 is 0.1 μm, the heat reflectance is 90%, and similarly, the relative heat reflectance is 97%. When the thickness of the non-adhesive coating film 12 is 0.3 μm, the heat reflectance is 88%, and similarly, the relative heat reflectance is 95%. When the thickness of the non-adhesive coating film 12 is 0.5 μm, the heat reflectance is 86%, and similarly, the relative heat reflectance is 92%. When the thickness of the non-adhesive coating film 12 is 1 μm, the heat reflectance is 67%, and similarly, the relative heat reflectance is 72%. When the thickness of the non-adhesive coating film 12 is 5 μm, the thermal reflectance is 52%, and the relative thermal reflectance is 56%. When the thickness of the non-adhesive coating film 12 is 10 μm, the heat reflectance is 2
0%, and the relative thermal reflectivity is also 22%.

When the toast is baked in a microwave oven using the non-adhesive coating film 12 on the wall of the heating chamber, it took 4 minutes and 30 seconds with the conventional non-adhesive fluorine paint, but a stainless steel plate SUS430 (2D) 3 minutes and 25 seconds when the non-adhesive film is not provided, 3 minutes and 29 seconds when provided with a thickness of 0.05 μm, 3 minutes and 30 seconds when provided with a thickness of 0.1 μm, and a thickness of 0.3 μm 3 minutes and 32 seconds, 3 minutes and 34 seconds for a thickness of 0.5 μm, 3 minutes and 55 seconds for a thickness of 1 μm, 5 minutes
4 minutes and 10 seconds for a thickness of μm, 4 minutes and 26 minutes for a thickness of 10 μm
Seconds.

Accordingly, the non-adhesive coating film 12 having a relative heat reflectance higher than 50%, that is, the wall material 10 provided with the non-adhesive coating film 12 maintaining the heat reflectance of the stainless steel plate 11 at 50% or more. By doing so, the cooking time can be reduced.

As described above, when the film thickness exceeds 5 μm and the relative thermal reflectance is less than 50%, the effect of shortening the baking time by improving the heat reflectivity becomes lower as compared with the baking performance of the toast, and the difference from the conventional paint is reduced. It turns out that it becomes small. Also,
The thinner the coating film, the higher the heat reflectance and the shorter the baking time of the toast, but if it is less than 0.1 μm, the effect of shortening the baking performance is not so much improved. In order to improve the baking performance of toast etc. compared to conventional non-adhesive films and to have non-adhesiveness, adhesion and hiding of the coating film and mass production by painting with roll coater, spray coater, curtain coater etc. Considering properties and the like, the thickness is preferably about 0.3 μm to 1 μm. In practical use, the thickness should be about 0.05 μm to 3 μm, and if it exceeds 5 μm, the improvement in baking performance is small and the effect is low. Practically, energy saving effect is 5μm
It is considered that the thickness does not exceed. When the thickness is less than 0.05 μm, pinholes are easily generated in the coating film, and the performance such as adhesion of the coating film tends to decrease.

As disclosed in Japanese Patent Application Laid-Open No. 10-208862, an aluminum powder is dispersed in a coating film to obtain a reflectance of 50%.
To obtain (%), it was necessary to disperse the aluminum powder by 37 (%). The adhesion of the coating film was evaluated by the cross-cut tape method (JIS K5400, General Test Method for Paint 8.5, Adhesion Regulation. Conducted with a cutter guide clearance of 1 mm. Adhesion and adhesion are used in the same meaning). In the coating film in which the aluminum powder was dispersed at 37%, the initial adhesion was 8 to 10 points, which was good.
After applying a heat history of 0 hours, the coating film almost peeled off at two points from zero point. On the other hand, in the wall material provided with the non-adhesive coating film of the present invention, the adhesion was similarly evaluated. The points were 8 to 10 points, indicating good adhesion. As described above, as described in the prior art
Although it is possible to obtain a reflectance of 50 (%) by dispersing aluminum powder in a coating film as shown in JP-A-0-208862, the non-adhesiveness of the present invention is high in durability and heat stability of the coating film. It can be seen that the wall material provided with the coating film is excellent.

As shown in FIG. 5, in this experiment, if the toasting time is to be set within 4 minutes and 15 seconds, the relative thermal reflectance needs to be 50 (%) or more. In addition, if the toasting time is set within 4 minutes, the relative heat reflectance needs to be 60% or more, and if the advantage is to be obtained in the actual equipment design, the relative heat reflectance is required. Is 60
(%) Or more is desirable. Further, in order to reduce the baking time of the toast by about one minute, the relative thermal reflectance is desirably 75 (%) or more.

Prior to the present invention, in order to increase the heating efficiency, the heating chamber is constituted by using a wall material having a heat reflectance of 50% or more of that of the metal and having a non-adhesive coating film. Heating cooker was devised, but in that case, SU was used as metal.
Although S430 (BA) was used, in the present invention, SUS430 is used.
By using (2D), the effect of making the toasted and baked cookies uniform can be obtained. This is presumably because the surface roughness of the stainless steel plate was rougher in the 2D finish, and uniform light distribution was obtained due to diffusion of the reflected light on the inner wall surface of the oven.

Example 2 As shown in FIG. 4, a non-adhesive film 12 in which a pigment 22 was dispersed was provided on the surface of a stainless steel plate 11. In this embodiment, stainless steel plate SUS430 (2D) was used as the stainless steel plate. As a non-adhesive film, polytetrafluoroethylene (P
(TFE) resin was dispersed in a polyethersulfone (PES) resin and a solvent, and a pigment 22 was added thereto to use a colored paint.

The pigment 22 has an average primary particle size of 0.03 μm.
m of carbon dispersed in the coating film by 10% by weight.
When applied at a thickness of 5 μm, the coating film was colored black. By coloring the coating film, there is an effect of making the film less noticeable even when stains are attached, and there is an effect of making the film less noticeable even if the stains penetrate into the coating film. However, the heat reflectance decreases, and the toasting performance deteriorates.

As shown in Table 1, when the thickness of the non-adhesive film is 0.5 μm, when the pigment ratio is 5%, the heat reflectance is 83%, and the uncoated SUS430 (2D) The relative heat reflectance with respect to was 89%, and the baking performance of the toast was 3 minutes and 35 seconds. When the pigment ratio is 10%,
The heat reflectance is 80%, and similarly the relative heat reflectance is 8%.
6%, and the baking performance of the toast was 3 minutes and 37 seconds. When the pigment ratio is 15%, the heat reflectance is 72%.
Similarly, the relative thermal reflectance was 77%, and the toasting performance was 3 minutes and 44 seconds. When the pigment ratio is 30%, the heat reflectance is 66%, the relative heat reflectance is 71%, and the baking performance of the toast is 3/5.
5 seconds.

When the thickness of the non-adhesive film is 1 μm, when the pigment ratio is 5%, the heat reflectance is 60%, and similarly, the relative heat reflectance is 65%. 3
Minutes 59 seconds. When the pigment ratio is 10%, the thermal reflectance is 49%, and similarly, the relative thermal reflectance is 53%.
The baking performance of the toast was 4 minutes and 11 seconds. When the pigment ratio was 15%, the heat reflectance was 34%. Similarly, the relative heat reflectance was 37%, and the baking performance of the toast was 4 minutes and 18 seconds. When the pigment ratio is 30
%, The heat reflectivity was 25%, the relative heat reflectivity was similarly 27%, and the toast baking performance was 4 minutes and 20 seconds.

When the film thickness of the non-adhesive film is 5 μm, when the pigment ratio is 2%, the heat reflectance is 49%, similarly, the relative heat reflectance is 53%, and the toasting performance is 4
Minutes 13 seconds. When the pigment ratio was 5%, the heat reflectance was 30%. Similarly, the relative heat reflectance was 32%, and the baking performance of the toast was 4 minutes and 25 seconds. When the pigment ratio was 10%, the heat reflectance was 13%. Similarly, the relative heat reflectance was 14%, and the baking performance of the toast was 4 minutes and 32 seconds.

As described above, as the film thickness increases,
As the pigment ratio increases, the relative thermal reflectance decreases, and the toasting performance and the like also decrease.

From the above, it can be seen that even in a coating film containing a pigment, the toasting performance is improved as long as the heat reflection performance is not impaired. In addition, by using SUS430 (2D), the effect of making the toasted and cookie distribution uniform can be obtained. This is presumably because the surface roughness of the stainless steel plate was rougher in the 2D finish, and uniform light distribution was obtained due to diffusion of the reflected light on the inner wall surface of the oven.

(Example 3) As another example, instead of the polytetrafluoroethylene (PTFE) resin which is the fluororesin of the above example, tetrafluoroethylene
Perfluoroalkyl vinyl ether copolymer (PF
When the non-adhesive film 12 using A) is provided on SUS430 (2D), the heat reflectance when the thickness of the non-adhesive film 12 is 0.5 μm is 86%, and the uncoated SUS43
The relative thermal reflectance for 0 (2D) is 92%. When the thickness of the non-adhesive film 12 is 1 μm, the thermal reflectance is 67%, and similarly, the relative thermal reflectance is 72%.
Becomes

When the toast was baked in a microwave oven using the non-adhesive film on the wall of the heating chamber, as shown in (Table 1), when it was provided with a thickness of 0.5 μm, it took 3 minutes and 34 seconds,
When it was provided with a thickness of μm, the time was 3 minutes and 54 seconds.

The pigment 22 has an average primary particle size of 0.1.
When the same test was conducted using a coating material in which 03 μm carbon was dispersed in the coating film by 10% by weight, the heat reflectance when the thickness of the non-adhesive film 12 was 0.5 μm was 77%, and the uncoated SUS430 was not used. The relative thermal reflectance for (2D) is 8
3%, and the toasting time was 3 minutes and 36 seconds. When the thickness of the non-adhesive film 12 was 1 μm, the thermal reflectance was 66%, similarly, the relative thermal reflectance was 71%, and the baking time of the toast was 3 minutes and 58 seconds. Therefore, polytetrafluoroethylene (PTFE)
Similar effects were obtained when a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA) was used instead of the resin.

In the present invention, by using SUS430 (2D), the effect of making the toast and cookie distribution uniform can be obtained. This is presumably because the surface roughness of the stainless steel plate was rougher in the 2D finish, and uniform light distribution was obtained due to diffusion of the reflected light on the inner wall surface of the oven.

In order to impart non-adhesive performance, in the above-mentioned embodiment, polytetrafluoroethylene (P
TFE) resin and tetrafluoroethylene-
Perfluoroalkyl vinyl ether copolymer (PF
Although the case where A) was used was mainly described, the tetrafluoroethylene-hexafluoropropylene copolymer (FE) was used.
P), tetrafluoroethylene-ethylene copolymer (E
/ TFE), polychlorotrifluoroethylene (PCT
FE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), polyvinylidene fluoride (PVD)
F), polyvinyl fluoride (PVF) or a mixture of the above-mentioned fluororesins. As a resin to be added, besides polyethersulfone (PES), a polyamide (PA) resin, a polyimide (PI) resin,
Polyetherimide (PEI) resin, polyetheretherketone resin (PEEK), polyparabanic acid resin,
Epoxy resins, polyester resins, urethane resins and the like can also be used.

In addition to the heating means other than the electric heating device,
There are also a heating method by combustion and a method of radio wave heating by a magnetron.

The heating chamber of the heating cooker is usually made of a metal plate such as a stainless steel plate. However, the material is not limited to the stainless steel plate as long as it can withstand the heating temperature and has heat reflectivity. For example, the heating chamber can be made of a material obtained by subjecting a heat-resistant resin or ceramic to a surface treatment such as metal plating or a material having a resin or ceramic and metal foil or the like on the surface.

In this embodiment, the case of the microwave oven has been described. However, in order to increase the heating efficiency, the inner wall of the microwave oven has a heat reflectance of 50% of the heat reflectance of the metal.
By having the above and using a wall material having a non-adhesive coating film, dirt can hardly adhere.

In the above embodiment, SUS430 (2D) is used as the stainless steel plate as the stainless steel plate 11, but the same effect can be obtained by using other ferrite, austenite, or martensite.

Although the stainless steel plate 11 is used, any material other than the stainless steel plate can be used as long as the heat reflection performance of the surface can be obtained. For example, steel plate, plated steel plate and aluminum, copper, titanium, magnesium, nickel,
Zinc, iron, silicon, alloys thereof, and other transition metals can also be used.

When an aluminum or aluminum-plated steel plate or an aluminum-zinc alloy-plated steel plate is used for the wall surface of the heating chamber, higher heat reflection performance can be obtained than with a stainless steel plate.

Further, when the stainless steel sheet 11 having the non-adhesive film 12 of the present invention is used, since the thickness is much smaller than that of the conventional fluorine film, when the product of a heating cooker such as a microwave oven or a microwave oven is discarded, Since the amount of shredder dust can be reduced when the stainless steel plate 11 is shredded and shredded for reuse, the amount of waste can be reduced.

Even if the thickness of the coating film exceeds 5 μm, it is a film that transmits electromagnetic waves of thermal energy such as infrared rays and visible light and maintains the heat reflection performance of a base metal or the like at 50% or more.
It is not limited to the above coating film.

Although it is considered that the effect of the present invention can be obtained by using a silicone resin instead of the fluorine resin, it is difficult to obtain a thin film.

In the present invention, SUS430 (2D)
Can be used to obtain a gold color by firing at 350 ° C. to 420 ° C.
If a stainless steel plate subjected to bright annealing treatment as in S430 (BA) is used, coloring can be suppressed, and a wall surface utilizing the original metallic luster can be formed. Further, by making the surface of the SUS430 (BA) a 2D finished state, the baking distribution of the toast is changed to the SUS430 (2D).
Can be equivalent to In this case, even if the surface is 2D-finished, it is possible to maintain a metallic surface color with almost no coloration by baking at 350 ° C. to 420 ° C.

In the present invention, the stainless steel plate is colored at a temperature at which the paint is baked from the viewpoint of energy saving. However, the paint may be baked after the stainless steel plate is colored by heating or chemically treating in advance.

[0052]

[Table 1]

[0053]

As described above, according to the heating cooker of the present invention, a non-adhesive material having 50% or more of the heat reflectance of the base material on a stainless steel base material having a 2D finish. On the wall material provided with the coating film, the non-adhesive coating film is
By configuring the heating chamber using the wall material colored by firing at ℃ 420 ° C., taking advantage of the heat reflection performance of the surface of the stainless steel plate, and impart non-adhesive, less stain, and This has the effect of improving the uniformity of the distribution of grilled toasts and cookies, and of imparting color and design.

[Brief description of the drawings]

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

FIG. 2 is a schematic cross-sectional view of the configuration of the cooking device.

FIG. 3 is a cross-sectional view of the heating cooker before the schematic configuration.

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

FIG. 5 is a diagram showing the relationship between relative heat reflectance and toasting time;

FIG. 6 is a schematic cross-sectional view of the configuration of a conventional heating cooker.

FIG. 7 is a cross-sectional view before the schematic configuration of the cooking device.

[Explanation of symbols]

 10 Wall material 11 Stainless steel plate 12 Non-stick coating 13 Heating chamber

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F24C 14/00 F24C 14/00 A H05B 6/64 H05B 6/64 D (72) Inventor Yasunori Kaneko Osaka 1006 Kadoma Kadoma Kadoma Matsushita Electric Industrial Co., Ltd. F-term (reference) CA17 DA06 DB04 DC19 EB16

Claims (2)

[Claims] 1. A non-adhesive coating film having a thermal reflectance of 50% or more is provided on a stainless steel base material having a 2D-finished surface finish.
A heating cooker comprising a heating chamber using wall materials colored by firing at ~ 420 ° C. 2. A step of providing a non-adhesive coating film having a heat reflectance of 50% or more of the stainless steel plate on a stainless steel plate having a surface finish of 2D, and
A method for producing a wall material of a heating cooker in which a wall material constituting a heating chamber is formed by firing at 50 ° C. to 420 ° C. and coloring.