JPH04135842A - Novel gas range and material used therefor - Google Patents

Abstract

PURPOSE:To upgrade detergent properties and decorative properties by forming at least the outer face of a top plate mainly with a metal sheet coated with fluorine containing resin film. CONSTITUTION:An outer wall layer of a top plate of a gas range is composed mainly of a fluorine containing resin film, while an inner wall layer is formed with a metal sheet. Fluorine containing resin is thermoplastic resin containing fluorine atoms in the molecular structural formula of resin, and particularly, tetrafluoroethylene resin is preferred. Further, as for the tetrafluoroethylene resin, a tetraethylene.perfluoroalcoxyethylene copolymer (PFA) on a tetrafluoroethylene.ethylene copolymer (ETFE) is preferred. Also, a fluorine containing resin film used for the outer wall layer is free from pinholes and used for coating the metal sheet forming the inner wall layer, and its film thickness is 5-200mu, preferably 20-100mu. Also, as for the metal sheet, iron or aluminum metal sheet is preferred, and its sheet thickness is 1-2m/m, preferably 0.2-1m/m.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a new gas range and materials used therein, and more specifically, the present invention relates to a new gas range and materials used therein. This invention relates to a new gas range and materials used therein.

3゜ [Prior art] Conventional gas range top plates are made of painted steel plates that are corrosion-resistant and can withstand repeated wiping and cleaning, as oils and fats fly off, boiled food boils over, and seasonings such as salt and pressure oil spill out. or made of stainless steel. However, the scattered oil becomes oxidized due to the high temperature and becomes highly viscous, making it difficult to wipe off. Also, as juices and pressure oils dry out and become sticky or burnt, they cannot be removed simply by wiping them with a rag, and at the same time they rub into scratches and pinholes, making it necessary to scrub them vigorously with a scrubbing brush. Not only was it hard work, but it also caused rust. On the other hand, in recent years, as houses have become more upscale, a variety of designs are required, and it has become necessary to match colors and patterns to the designs of surrounding walls. Various studies have been made to satisfy these demands, and attempts have been made to improve cleanability by sintering or coating with fluororesin. However, pinholes occur in the resin, and the smoothness is poor, making it difficult to clean.
It is hard to say that the durability is sufficient. Furthermore, it is almost impossible to mix a high concentration of colored pigments when dispersing the dispersion, and it is often difficult to disperse the colored pigments in the dispersion itself, so it is virtually impossible to add coloring to the dispersion. is impossible. As mentioned above, there is currently no microwave oven that has both cleaning and decorative properties.

[Problems to be solved by the present invention]

The object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a novel gas range and materials used therein that have not been known in the past.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and is characterized in that at least the outer wall layer of the top plate of the gas range mainly consists of a fluorine-containing resin film, and the inner wall layer further consists of a metal plate. It provides a new gas range. The configuration of the present invention will be explained in more detail below.

The "fluorine-containing resin" as used in the present invention is not particularly regulated as long as it is a thermoplastic resin that contains a fluorine atom in the molecular structure of the resin, but generally, the molecular structure of the resin is Tetrafluoroethylene resins having four fluorine atoms in them, trifluoroethylene resins, difluoroethylene resins, -fluoroethylene resins, copolymers of these resins, and mixtures, etc. Of these, tetrafluoroethylene resins and nifluoroethylene resins are preferred, and tetrafluoroethylene resins are more preferred. Here, the tetrafluoroethylene resin specifically refers to, for example, tetrafluoroethylene resin (PTFE), tetrafluoroethylene/perfluoroalkoxyethylene copolymer (PFA),
), tetrafluoroethylene/hexafluoropropylene/perfluoroalkoxyethylene copolymer (EPE), and tetrafluoroethylene/ethylene copolymer (ETFE), etc.
Among them, PFA and ETFE are preferable, and PFA is particularly preferable. Further, the trifluoroethylene resin mentioned above specifically refers to, for example, trifluorochloride ethylene resin (PCTFE).
) and trifluorochloroethylene/ethylene copolymer (E
CTFE), among others, PCTFE is preferred. Specifically, the difluoroethylene-based and -fluoroethylene-based resins include, for example, vinylidene fluoride resin (
PVDF) and vinyl fluoride resin (PVC).

Furthermore, it goes without saying that the fluororesin film used for the outer wall layer in the present invention must be free from damage such as pinholes, and as long as it completely covers the metal plate that will become the inner wall layer. The film thickness may be any thickness, but is generally Q5 to 200μ, preferably round to 100μ.

These fluororesin films can be produced by conventional methods, such as hot-melt extrusion, casting, etc., and if necessary, pigments, dyes, etc. Blend and color,
Inorganic fillers such as glass powder, glass peas, and glass fibers, aluminum oxide, talc, mica, and silica can be added to improve the strength and the like. It is also possible to print desired designs.

Furthermore, the "metal plate" as used in the present invention is not particularly limited and can be any metal plate, but generally, for example, it is an iron-based, aluminum-based, copper-based metal plate, etc. Of these, iron-based and aluminum-based metal plates are preferred.

The iron-based metal plate may be any metal plate whose composition mainly contains iron, and specifically,
Examples include cold-rolled steel sheets, galvanized steel sheets, zinc alloy-plated steel sheets, aluminum-plated steel sheets, copper-plated steel sheets, stainless steel sheets, phosphate-treated steel sheets, and aluminum-zinc alloy-plated steel sheets. Among them, galvanized steel sheets, zinc alloy-plated steel sheets, etc. Preferred are steel plates, aluminum plated lead steel plates, aluminum-zinc alloy plated steel plates, and stainless steel plates.

Further, as the aluminum-based metal plate, any metal plate may be used as long as the metal plate mainly contains aluminum metal in terms of composition.
It is an aluminum plate described in pages 13 to 22 of "Aluminum Handbook (2nd edition)" published by the Light Metals Association (Light Metals Association) on September 30, 2007, and specifically, pure aluminum, (AI-
Cu) system, (Al-Mn) system, (AI-3i) system,
There are (AI-Mg) type, (AI-Mg-3i) type and (Al-Zn-Mg) type plates, among which pure aluminum type, (AI-Mn) type and (Al-Mg) type plates are preferable. .

Although the thickness of the metal plate in the present invention is not particularly limited, it is generally, for example, 01 to 2 m/m, preferably 02 to 1 m/m.

Next, the fluorine-containing resin film that will become the outer wall layer and the metal plate that will become the inner wall layer need to be bonded together. A method of fusion welding is preferred.

Films can be bonded by heat fusion welding using conventional methods, but generally include a pretreatment process, a heating process, film lamination, a pressurization process, a reheating process, and a cooling process. It can be obtained by the following steps.

The above steps will be explained below.

(1) Pretreatment Step This step is a step that is carried out as necessary to coat the metal plate and the fluorine-containing resin film more strongly.

■ Pre-treatment process of metal plates The purpose of pre-treatment of metal plates is to remove oily substances that adhere to the surface.
Cleaning and removing foreign substances, oxide films, etc., exposing bare metal to the surface by polishing, etc., surface plating,
Apply surface treatment such as acid treatment, and if necessary,
Add roughness to the surface, etc.

31 Surface cleaning There are no particular limitations, and cleaning methods conventionally used for specific metals may be used. For example, as a degreasing method,
Degrease and clean using organic solvents, alkaline aqueous solutions, surfactants, etc.

b. Surface polishing The surface can be polished to expose the bare metal on the surface, for example, by mechanical and chemical polishing.

Surface Treatment If necessary, the surface covered with the film may be subjected to chemical conversion treatments such as plating treatment, coating treatment for installing a metal oxide film layer, and rust prevention treatment. For example, specific examples of chemical conversion treatments for iron-based metals include phosphate treatment with zinc phosphate, calcium phosphate, etc., and chromate treatment with reactive chromate, coating type chromate, and the like.

The surface can be roughened by a surface roughening method using physical means such as surface roughening brushing, sandblasting, shot blasting, etc., or by a surface roughening method using a chemical or electrochemical etching method or a combination thereof.

■ Film pre-treatment process Removing oily matter, foreign matter, etc. adhering to the film surface, applying an oxide film etc. by corona discharge treatment, straw material treatment, etc., and using various surface treatment agents. For example, treatments such as coating with aminorane, vinylsilane, mercaptosilane, etc. can be performed.

(2) Heating process This is a process in which the pretreated metal plate is heat treated in the air or in an atmosphere substantially free of oxygen. In the present invention, the latter is particularly preferable in the case of iron-based metal plates, and is also necessary. In this step, the film is also heat-treated at the same time.

■Heating atmosphere The above-mentioned “substantially oxygen-free atmosphere” means:
There are no particular restrictions as long as the atmosphere can be heated while substantially maintaining the surface condition of the metal plate and film that has undergone the pretreatment process. Specifically, the oxygen content must be 1% or less. preferable. To create this heating atmosphere, it can be filled with an inert gas or heated in a vacuum state. Any type of inert gas may be used, but generally nitrogen gas, argon gas, neon gas, helium gas, etc. are preferred, with nitrogen gas and argon gas being preferred, and nitrogen gas being particularly preferred.

In addition, the vacuum state is 5 Torr or less, preferably I
Torr or less, more preferably 0ITor or less.

■ Heating temperature The optimum heating temperature is determined depending on the type of fluororesin film and metal plate to be coated, but in general, it is determined by the softening point temperature (mp) of the fluororesin film.
Above, preferably (mp +30) 'C or higher, more preferably (mp +50) 'C or higher, and lower than the thermal decomposition temperature. Specifically, in the case of a fluororesin film, tetrafluoroethylene・For perfluoroalkoxyethylene copolymers, generally 280 to 400°C
, in the ethylene-tetrafluoroethylene copolymer,
Generally 260-370°C, for ethylene-chlorotrifluoroethylene copolymer, generally 220-350°C.
°C, and 250 to 300 °C for polyvinylidene fluoride.

■Heating time Heating time varies depending on the heating method and is not something that should be specified in particular.It must be the time required to reach at least the surface of the metal plate or the heating temperature, and may be adjusted as appropriate depending on the type and thickness of the metal plate. It is determined.

(3) Lamination step This step is a step of covering a heated metal plate with a fluorine-containing resin film by lamination and pressing.

■ Lamination atmosphere The lamination atmosphere is not particularly restricted, but in the case of iron-based materials, it must be an atmosphere that is substantially free of oxygen, at least until the film is laminated and placed on the heated metal plate. It is desirable that the atmosphere be similar to that of the previous step (2).

■ A film laminated and placed on a press-heated metal plate, for example,
This is a process of continuously pressing with a book roll or the like to strongly coat the material. Here, the roll in contact with the film is preferably a roll that does not stick to the film, such as a rubber roll or a metal roll, and the pressing force is 5 to 30 kg/cTr12,
Preferably it is 10-20 kg/CT112.

(4) Reheating process This process is a reheating process that is performed as necessary to further strengthen the fusion force between the metal plate and the film of the film-coated metal plate obtained in the previous process. .

(2) Heating Atmosphere The heating atmosphere is not particularly limited, and may be in the air, but is preferably an atmosphere similar to that in the previous step (2).

■ Heating temperature The optimum heating temperature is determined as appropriate depending on the type of fluororesin film and metal plate to be coated, but generally it is higher than the softening point temperature (mp) of the fluororesin film, preferably (mp +20) °C or higher, more preferably (mp +30) °C or higher and lower than the thermal decomposition temperature. Specifically, in the case of a fluororesin film, tetrafluoroethylene/perfluoroalkoxyethylene For copolymers, generally 280-400°C1
For ethylene-tetrafluoroethylene copolymers, the temperature is generally 260 to 360°C, and for ethylene-chlorotrifluoroethylene copolymers, it is generally 220 to 350°C.
For C and polyvinylidene fluoride, the temperature is 200 to 250°C.

■ Heating time The heating time is not something that should be specified in particular; it must be at least the time it takes for the metal plate to reach a predetermined temperature and for the welding force to be sufficiently developed. generally 1 to 20 minutes.

(5) Cooling Step This step is a step of cooling the reheated film-coated metal plate to room temperature, and can be cooled, for example, with an air cooling fan, water, or the like.

The film-coated metal plate of the present invention obtained through the above steps exhibits strong adhesive strength between the metal plate and the fluorine-containing resin film, and has excellent durability.

The step of forming the joined body of the metal and fluorine-containing resin film obtained through the above steps into a trough plate for a gas range involves conventional steps such as a cutting step, a pressing step, and further steps as necessary. There is a joining process, etc.

The forming process for fluororesin film laminated metal plates involves cutting them into the desired shape (cutting process) by shearing, cutting (milling, sawing), etc., and then bending, drawing, etc. After forming the top plate into a top plate (top plate forming process), welding (arc welding, plasma welding, electron beam welding), brazing, soldering, riveting, etc. as necessary (joining process). It can be performed.

As the printing layer, it is preferable to provide the printing layer described in Japanese Patent Application No. 1-73899 and Japanese Patent Application No. 1-139155. For example, the printing layer in Japanese Patent Application No. 1-73899 is a fluororesin layer heat-sealed to the metal surface, and the uppermost layer is made of a fluororesin composition with a thixotropic index (TI value) of 2 to 8. The printing layer is formed by printing using the ink of
A preferred embodiment of the printed layer in No. 73899 is a printed layer in which a fluororesin film having a printed layer is heat-sealed to a metal surface with the printed layer inside.

The thus obtained top plate for a gas range of the present invention has an outer wall layer that is a smooth continuous uniform layer of fluorine-containing resin film with no pinholes. Not only does it not penetrate and is highly durable, but its non-wetting properties allow it to wipe off oil and other adhering substances, as well as dry and burnt substances, with cloth or paper. Since there is no foreign matter buried in holes or dents, complete cleaning is very easy. In addition, it is highly heat resistant and chemically stable, so
Compared to conventional coated boards, there is no thermal discoloration, oxidative deterioration, or chemical changes due to reactions with oil or juice, so you can maintain a beautiful surface for a long time, and at the same time, if you print on film or metal, or draw on metal, there will be no powder baking. A top plate for a gas range with a rich design that cannot be obtained with coating or dispersion coating can be obtained, and the gas ranges that will be made from now on will be excellent and meet a wide range of demands of modern life.

The present invention will be explained in more detail below with reference to Examples, but it goes without saying that the present invention is not limited only to the Examples.

Example 1 First, an aluminum plate of A 3004P-H34 (thickness 1+nm) specified in JISH4000 was used as an aluminum base material, and the surface of the aluminum plate was sandblasted (using reduced iron powder 80 mesh, pneumatic pressure 3 kg). / cTn2) to roughen Ra (center line average roughness) to 18 μm, and then apply a current density of 3.3 A/drr in a 4% sodium chloride aqueous solution. A rough surface with an Ra of 3.5 μm was formed by electrolytic etching under the following conditions.

This aluminum plate was heated to i'9350°C, and a 50 μm thick ethylenetetrafluoroethylene copolymer film (melt flow index 30 m3/sec) was heat-sealed to the rough surface formed, as shown in Figure 1. A fluororesin laminated aluminum plate having the same shape as shown was obtained.

The above-mentioned thermal fusion bonding is performed by applying a pressure of 15 k to the heated metal plate and the above-mentioned film using a silicone roll with a diameter of 10 cm.
g/cTn conditions were used.

A top plate of a microwave oven is manufactured using the resin laminated aluminum plate formed as described above. First, it was cut into a predetermined size, then the burner part was punched out, and the top plate was press-molded into a predetermined shape using a press.

Example 2 Example 1. The surface of the fluorine film in contact with the metal was treated with corona to activate it to a wetting index of 42 dyn/an.

Next, polyvinylidene fluoride was dissolved in dimethylacetamide and an ink mixed with a pigment was used to perform screen printing on the active surface of the above film to prepare a printed film.

Next, the printed surface of this printed film was brought into contact with metal to obtain an aluminum plate coated with a fluororesin film in the same manner as in Example 1, and a top plate for a gas range was produced.

Example 3 Screen printing was performed on an aluminum plate that had been pretreated in the same manner as in Example 1 using the ink prepared in Example 2 to obtain a printed aluminum plate. A fluorine film was heat-sealed to the printed surface of this printed aluminum plate in the same manner as in Example 1 to obtain a fluororesin film-coated aluminum plate, thereby producing a top plate for a gas range.

Example 4 A with a thickness of 1 mm specified in JIS A4000
The surface of l100P-HI3 (aluminum) plate is
Diameter 50mm with 80 grit sandpaper attached
Using a milling machine to which a circular metal plate was fixed, the rotation speed of the milling machine was 1100 rpm and the scribing speed was 100 cm/
The polishing process was performed under the minimum condition. The resulting linear scratch pattern had a scratch depth of 1 μm.

The surface of the scribed aluminum plate was degreased with a 1% aqueous solution of caustic soda, and then subjected to the heating process of Example 1, followed by the same process to obtain a fluororesin film laminated aluminum plate. A top plate for a gas range was made using this.

Example 5 Commercially available phosphate-treated electrogalvanized steel sheet (Nippon Steel:
The surface of a bonded steel plate (EGC, thickness 0.6rn/m) was cleaned with an alkaline degreaser (Fine Cleaner 301, manufactured by Nippon Bar Ising Co., Ltd.) at 60°C for 3 minutes, and then washed with water and dried. This steel plate was placed in a nitrogen-substituted heating furnace with an oxygen concentration of 01% and heat-treated at 350°C for 6 minutes. 7kg of b50μ ethylenetetrafluoroethylene resin film /
Heat fusion was performed at a pressure of cm2. Further, this heat-sealed steel sheet was reheated at 325° C. for 7 minutes in a nitrogen atmosphere, and cooled by being left indoors to obtain an ethylenetetrafluoroethylene resin film-coated steel sheet. A top plate for a gas range was manufactured using the obtained coated steel plate.

Example 6 In Example 5, the ethylenetetrafluoroethylene film was replaced with the printed ethylenetetrafluoroethylene film of Example 2.

Example 7 Instead of the steel plate of Example 6, 5US-304 (plate thickness 06m) was used.
/m) was used.

Example 8 In Example 7, the film fluorinated ethylene was changed to a fluoroalkoxyethylene film.

Table 1 Performance Comparison (Evaluation Method) Cleanability Method A: A thin layer of salad oil in which carbs were dispersed was spread on a prototype top plate. Next, after wiping with tissue paper, any remaining oil was removed by touch.

The evaluation criteria are as follows.

Almost no oil gets on my hands O 〃Slightly sticks to hands　　△ 〃〃　　　　　　　　　× In addition, oil black spots (pinholes, dents) The presence or absence of taste was observed.

Method B: Dropped fish broth onto the prototype top plate, allowed it to dry, and then wiped it off with tissue paper.

The evaluation criteria are as follows.

Easy to remove ○ Can be removed by rubbing Δ Cannot be removed without applying force and rubbing. 3 cc of aqua regia was placed inside and left at 70°C, and the presence or absence of changes was observed.

3. Regarding design printing colors and marking colors, the sharpness of the printed designs and marking designs was visually checked.

The evaluation criteria are as follows.

The printed pattern is clear even after processing ○ 〃 〃 Not visible but visible △ 〃 Significantly changed × 4 Expose the surface of the heat-resistant top plate to the flame of a torch burner for 3 seconds and observe the change in the surface.

〔Effect of the invention〕

The top plate of the gas range obtained by the present invention is clearly superior in cleaning and has excellent durability. Furthermore, the top plate of the gas range obtained by the present invention is not only easy to clean but also has excellent durability. By printing, etc., it is possible to create something rich in design that fits modern life.

Claims (1)

[Scope of Claims] 1. A gas range characterized in that at least the outer surface of the top plate is mainly made of a metal plate coated with a fluorine-containing resin film. 2. The novel gas range according to claim 1, wherein the fluororesin film has a printed layer. 3. The novel gas range according to claim 1, wherein the fluororesin is a tetrafluoride resin. 4. The novel gas range according to claim 3, wherein the tetrafluorocarbon resin is a tetrafluoroethylene/perfluoroalkoxyethylene copolymer (PFA). 5. The novel gas range according to claim 3, wherein the tetrafluorocarbon resin is a tetrafluoroethylene/ethylene copolymer (ETFE). 6. The novel gas range according to claim 1, wherein the film has a thickness of 5 to 200μ. 7. The novel gas range according to claim 1, wherein the metal of the metal plate is an aluminum metal plate. 8. The novel gas range according to claim 1, wherein the metal of the metal plate is an iron-based metal plate. 9. A novel gas range according to any one of claims 1, 7 and 8, wherein the metal plate has a thickness of 0.1 to 2.0 m/m. 10. A material for use in a gas range, characterized in that at least the outer surface of the top plate is a metal plate mainly covered with a fluorine-containing resin film.