JP2001090961A - Cooking heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional cooking heater having a chamber coated, on the inner wall thereof, with fluoropolymer and baked in order to impart water repellent oil repellent properties that the contaminant removing function is insufficient. SOLUTION: When a user operates an idle baking set button 2 provided on the surface of the housing 1 of a cooking heater before starting cooking or after ending cooking, fat components is deteriorated and can be wiped off easily using a cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device used in households and the like.

[0002]

2. Description of the Related Art Heating cookers such as microwave ovens and oven toasters cook foods such as fish and meat stored in a refrigerator by heating them with built-in heaters and high-frequency transmitters. .

[0003] At this time, in order to prevent oils and the like generated from the cooked food from being scattered and adhered to the inside of the refrigerator when heated, that is, to make it easy to wipe off dirt in the refrigerator due to the oils and the like after the cooking is completed. Fluoropolymer is applied and baked on the inner wall of the cooker to impart water repellency, oil repellency and stain resistance.

[0004] That is, dirt such as oils and fats adhered to the interior of the refrigerator increases in viscosity due to thermal polymerization, and even when wiped with a dry cloth or a wet cloth, the dirt components spread only white and are difficult to remove. Further, when the next cooking is performed without cleaning the inside of the refrigerator after the completion of the cooking, dirt is burned into the refrigerator and cannot be removed. When the inside of the refrigerator becomes dirty as described above, the reflection characteristic of the heat ray is reduced, and the cooking efficiency is also reduced.

[0005]

In a conventional cooking device, a fluoropolymer is applied and baked on the inner wall of the refrigerator in order to impart water repellency, oil repellency and antifouling property. It has the problem of being inadequate.

[0006]

According to the present invention, the user operates the empty baking setting button provided on the surface of the housing before the start of cooking or after the end of cooking, thereby changing the oil and fat components and making it easy to wipe off with a cloth. It can be used as a heating cooker.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a user operates an empty baking setting button provided on the surface of a casing before starting cooking or after finishing cooking, thereby transforming oil and fat components to use a cloth. The heating cooker allows easy wiping.

According to the second aspect of the present invention, when the baking setting button is pressed, the heating means changes the atmosphere in the refrigerator from 200 ° C. to 28 ° C.
By heating to 0 ° C., the oil and fat component is thermally decomposed without excessive thermal decomposition, so that the cooking device can be easily wiped off with a cloth.

According to a third aspect of the present invention, the inner wall of the refrigerator is made of a fluoropolymer pre-coated steel plate, and the dirt due to the grease component is repelled in the form of oil droplets. The heating cooker can be easily wiped off.

According to a fourth aspect of the present invention, the inner wall of the container is made of a base material using aluminum or a metal having an aluminum alloy or an aluminum alloy film or a ferrite stainless steel and a fluorine thin film provided on the base material. The heating cooker is configured so that wiping can be easily performed, and the inner wall of the refrigerator is excellent in heat resistance and oxidation resistance, and also has excellent heat ray reflection characteristics, so that highly efficient cooking can be performed.

[0011] The invention described in claim 5 is a heating cooker provided with a strong film by forming the fluorine thin film in two layers.

[0012]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is an explanatory diagram showing the appearance of a microwave oven according to the present embodiment. On the surface of the housing 1, there is an empty baking setting button 2 operated by a user. Further, the wall surface of the interior 3 has water and oil repellency.

The water and oil repellency was measured by using a pre-coated steel sheet made of a fluoropolymer as the material used for the wall surface of the interior 3 and using aluminum, an aluminum alloy or a metal having an aluminum alloy film, or a ferritic stainless steel. This is realized by using a base material and a fluorine thin film provided on the base material.

When the user finishes cooking and presses the empty baking setting button 2, the heater incorporated in the control device (not shown) is energized, and the temperature of the inside of the refrigerator 3 is set to 200 ° C. to 280 ° C.
Heat to Examples of the heater include a sheath heater, a Milacron heater, and a halogen heater. FIG.
Is a characteristic diagram showing the state of this heating. According to the experiments by the inventors, the soil of the fat component increases the viscosity of the fat component by thermal oxidation at room temperature to about 200 ° C. In this state, it is difficult to remove dirt due to the fat component adhering to the wall surface of the interior 3 by dry wiping using a cloth or the like. In the present embodiment, this state is further changed by 2
It is heated to about 50 ° C. to 260 ° C. or more.
For this reason, the fat component is thermally decomposed (oxidatively decomposed) to denature and solidify the oil, which is a solid that can be removed by light abrasion such as a cloth width. If this thermal decomposition proceeds too much, it will adhere to the inner wall surface of the refrigerator. 200 ° C ~
It is necessary to perform in an atmosphere at a temperature of 280 ° C.

In the present embodiment, the wall surface of the interior 3 is fixed as described above because the fat and oil component adheres in a spread state when the oil and fat component has high wettability. It has water and oil repellency.

(Embodiment 2) Next, a second embodiment of the present invention will be described. In the present embodiment, the thin film described in the first embodiment is composed of two layers.

That is, a thin film is formed by a lower film provided on a base material and an upper film further provided on the lower film. The lower layer film is a film made of a metal oxide having a three-dimensional matrix structure, and after applying a metal alkoxide, a partial hydrolyzate of a metal alkoxide, polysilazane, etc. to a substrate, heat-treating, and then applying an acid treatment or the like. The structure is such that the number of hydroxyl groups on the surface is increased by adding treatment. The upper layer film is a chemically adsorbed molecular film or a film made of a metal oxide having a three-dimensional matrix structure containing a fluorine compound. The chemisorbed molecular film is a film in which a silane-based surfactant containing a fluorinated alkyl group is applied to a lower layer film and a condensation reaction is performed at room temperature. A film made of a metal oxide having a three-dimensional matrix structure containing a fluorine compound is a methoxysilane compound or an ethoxysilane compound, or a methoxysilane compound containing a fluorinated alkyl group or an ethoxysilane compound containing a fluorine compound, and water, A solution comprising an acid catalyst is applied, and 30
It is formed by firing at about 0 to 400 ° C. for about 30 minutes.

(Experimental Example) The results of an experiment conducted to verify the effect of the present embodiment will be described below. In this experiment, an oil / fat component was dropped on the inner wall of the refrigerator, and after baking, it was examined whether or not it could be wiped off by rubbing with a wet cloth. The dropping of the oil component is performed by dropping about 5 μL of commercially available vegetable oil onto several points on the surface of the inner wall of the sample. The sample used in the experiment was our microwave oven NE-N2 whose inner wall is made of pre-coated steel plate.
00 (sample 1) and SUS430 B
A thin film made of a functional group-containing fluoropolymer having two or more types of functional groups such as an amino group, a hydroxyl group, a carboxyl group, an alkoxyl group, an ester group, a halogen group, and an epoxy group was formed on the A-finished substrate. An inner wall (Sample 2) and an SUS430 BA-finished substrate with a silica layer formed as a lower layer and a chemically adsorbed molecular film formed as an upper layer (Sample 3)
And a conventional product that is a comparative product. Table 1 shows the experimental results.

[0019]

[Table 1]

As shown in Table 1, the baking temperature of the comparative product was set at 200 ° C. to 300 ° C., and the oil and fat components were completely baked as brown stains on the storage wall, and were removed. It is in an impossible state.

At 200 ° C. to 280 ° C., the fats and oils of Samples 1, 2, 3, and 4 are thermally decomposed into a denatured soft brown solid, which can be wiped off with a wet cloth. . In the heat treatment at 300 ° C., the fat component adheres to the wall surface as a hard brown solid and cannot be wiped off.

The contact angle with vegetable oil was measured using the same sample. This contact angle is measured using a contact angle meter manufactured by Kyowa Interface Chemical Co., Ltd. Table 2 shows the experimental results.

[0023]

[Table 2]

The contact angle with vegetable oil of the conventional product is as small as 24 ° with vegetable oil. Therefore, when the fat and oil component adheres to the surface, it adheres in a thin film rather than as an oil droplet, and the fat and oil component that has adhered due to dry baking is immediately burned and cannot be removed. On the other hand, Samples 1, 2, 3, and 4 are 60 °, 62 °, 74 °, and 66 °, respectively, and the attached fats and oils are oil droplets. (Oxidative decomposition) to denature and solidify the oil to form a solid that can be removed by light abrasion such as a cloth.

Further, the atmosphere temperature in the refrigerator and the temperature of the wall surface in the refrigerator when the baking setting button 2 shown in FIG. 1 is pressed are compared. In this experiment, the baking temperature was set at 250 ° C. for 20 minutes, and the temperature of the atmosphere in the refrigerator and the temperature of the wall surface in the refrigerator were examined using a temperature sensor. The sample used in the experiment was Sample 1 described above.
And sample 3. The results of the experiment are shown in Table 3.
Note that the temperature of the wall surface in the refrigerator in this experiment is the highest value of the temperature of the central portion of the side surface.

[0026]

[Table 3]

In the sample 1, the ambient temperature in the refrigerator was higher at the inner wall surface temperature than the ambient temperature in the refrigerator, and considerably exceeded the set temperature. It is considered that this is because the inner wall in the refrigerator absorbs the heat rays radiated from the heater as radiant heat. As for Sample 3, it can be seen that the surface temperature of the inner wall in the refrigerator is lower than the set temperature, and that the heat rays are efficiently reflected. From this, when the reflection characteristics of the internal wall surface are improved, the set internal temperature (250 ° C.
280 ° C) or less to keep the inner wall surface below
It can be said that excessive thermal decomposition of the oil can be prevented.

Next, a wear test was performed to compare the strength of the thin film forming the inner wall of the refrigerator. In this test, the surface of the sample was rubbed 10,000 times using a cotton cloth with a force of 2 kg weight, and the contact angle with oil was compared with the initial value. Sample 2 and sample 3 are used as the sample. Sample 2 is a thin film having one layer, and sample 3 is a thin film described in Example 2 having two layers. The results of this test are shown in Table 4.

[0029]

[Table 4]

As shown in Table 4, it can be said that the thin film composed of two layers has no change in the contact angle before and after the abrasion test and has a higher strength. Therefore, it can withstand long-term use.

[0031]

According to the first aspect of the present invention, the baking setting button is provided on the surface of the housing, and the inner wall of the chamber has a water- and oil-repellent property. This realizes a heating cooker that can be performed.

According to the second aspect of the present invention, when the baking setting button is pressed, the heating means changes the atmosphere in the refrigerator from 200 ° C. to 28 ° C.
As a configuration for heating to 0 ° C., the present invention realizes a heating cooker in which fats and oils are thermally decomposed without excessive thermal decomposition and wiping with a cloth is easy.

According to a third aspect of the present invention, the inner wall of the refrigerator is formed of a fluoropolymer pre-coated steel plate, and the dirt due to the oil component is repelled in the form of oil droplets. Thus, the present invention realizes a heating cooker in which wiping can be easily performed.

According to a fourth aspect of the present invention, the inner wall of the refrigerator is formed by a base material using aluminum or a metal having an aluminum alloy or an aluminum alloy film or a ferrite stainless steel and a fluorine thin film provided on the base material. It can be easily constructed and wiped off, and the cooking chamber has excellent heat resistance and oxidation resistance, and also has excellent heat ray reflection characteristics. It is.

According to a fifth aspect of the present invention, there is provided a heating cooker comprising a thin film having two layers and having a strong film.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the appearance of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing the temperature in the empty baking oven;

[Explanation of symbols]

 1 Case 2 Baking setting button 3 Inside

Claims (5)

[Claims] 1. An empty baking setting button is provided on a surface of a housing,
A cooking device with a water- and oil-repellent inner wall. 2. The cooking device according to claim 1, wherein the heating means heats the atmosphere in the refrigerator to 200 ° C. to 280 ° C. when the empty baking setting button is pressed. 3. The cooking device according to claim 1, wherein the inner wall of the refrigerator is made of a fluoropolymer pre-coated steel plate. 4. The inner wall of a refrigerator is made of a base material using aluminum, an aluminum alloy or a metal having an aluminum alloy film, or a ferrite stainless steel, and a thin film of fluorine provided on the base material.
The cooking device described in 1 above. 5. The cooking device according to claim 4, wherein the thin film is composed of two layers.