JP2819364B2 - Surface treatment method for kitchen equipment made of zinc steel plate or stainless steel such as gas range - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application] Surface treatment method for kitchen equipment made of zinc steel plate or stainless steel such as gas range.

[0002]

2. Description of the Related Art Conventionally, kitchen equipment such as a gas stove has a certain kind of coating on an aluminum surface. However, there remains a problem that dirt such as boiling over, soy sauce and oil cannot be easily wiped off. Further, aluminum is weak against high temperatures, and therefore has a difficulty in its strength.

On the other hand, a gas range using a zinc steel plate has strength against heat, but has a problem that the zinc plating is peeled off due to high heat because the zinc plating is as thin as 1 to 2 microns. Another drawback is that dirt such as boiling over cannot be easily removed as in the case of aluminum.

[0004]

[PROBLEMS TO BE SOLVED] The corrosion resistance to heat and strength of conventional kitchen equipment made of zinc plate or stainless steel such as a gas stove and the like, and the dirt such as soy sauce and oil can be easily wiped off.

[0005]

[Technical Means] As a first step, about 80 mesh sandblast is applied to a galvanized surface or a stainless steel surface of a flat zinc-plated steel sheet.

[0006] As a second step, it is immersed for about 10 seconds in a hydrochloric acid aqueous solution having a concentration of about 14%,

As a third step, the immersed zinc steel plate or stainless steel plate is washed with water,

In the fourth step, the surface of the water-washed zinc steel plate or stainless steel plate is placed on a fluororesin film by 340.
Apply heat inside and outside ℃

As a fifth step, the coated fluororesin film is fired at 320 ° C. for about 10 minutes,

In a sixth step, a zinc steel sheet coated with the fluororesin film is formed into a required shape, and a method for treating kitchen equipment made of zinc steel sheet or stainless steel, such as a gas range, is provided.

[0011]

The fluororesin film, especially the ethylene tetrafluoride copolymer film, has a high melting point and does not peel off against high heat such as a gas range. The zinc steel sheet does not deform even at high temperatures.

[0012]

Embodiments of the present invention will be described below.

(A) As the first step, zinc steel sheet ZnSt
Sandblasting Sb using particles of about 80 mesh is applied to the zinc plating Zn on the surface. (Fig. 1)

{B} As a second step, the zinc steel sheet ZnSt is immersed in an Hcl solution having a concentration of 14% or more for about 10 seconds.
(Fig. 2)

(C) As the third step, the zinc steel sheet ZnS
When t is washed with water, an acute-angled rough surface is obtained. (Fig. 3)

D) As a fourth step, the zinc-washed zinc steel sheet ZnSt is heated to 250 to 300 ° C., and a fluororesin film F.film, for example, a film of tetrafluoroethylene copolymer is placed thereon. Then, heat of about 340 ° C. is applied from the surface of the film to temporarily melt the fluororesin film F · film. Thus, the fluororesin film F · film is etched into the sharply rough surface of the zinc steel plate ZnSt. Next, the zinc steel sheet and the film are cooled to 100 ° C.

E) As a fifth step, when the molten fluororesin film F.film is baked (annealed) at 180 to 200 ° C. for about 10 minutes, the resin film F.film is cured and adhered.

As the fluororesin film, a tetrafluoroethylene copolymer such as a silicon resin Aflon COP manufactured by Asahi Glass Co., Ltd. is used. The melting point of this silicone resin is around 340 ° C, and it is galvanized and steel plate,
The adhesive strength to the stainless steel plate is very good, and the zinc steel plate ZnSt in the first to fifth steps is a stainless steel plate (S
T).

The above-mentioned tetrafluoroethylene copolymer is presumed to have the following chemical formula.

The properties are as follows. Physical properties specific gravity 1.73 to 1.75 mp two hundred and fifty-five to two hundred seventy ° C. Melt viscosity 10 ⁴ to 10 ⁵ poise

[0021] Mechanical properties Tensile strength (23 ℃) 410~470kg / cm ² yield strength (23 ℃) 190~220kg / cm ² elongation at (23 ℃) 420~440% tensile elastic modulus kg ^/ cm 2 5 to 8 × 10 ³ Coefficient of friction (to stainless steel) 0.20

Thermal properties Thermal expansion coefficient 9.4 × 10 ⁻⁵ c ⁻¹ Flammability Non-combustion Continuous heat resistant operating temperature 180 ° C.

Chemical properties Chemical resistance Excellent Water absorption (23 ° C.) 0.01%>

Electrical properties Short time 12 KV / 0.
1mm film Volume resistivity 10 ¹⁷ Oha · cm Arc resistance 120 sec

In view of the above physical, mechanical, thermal, chemical, and electrical properties, the present invention is most preferably a tetrafluoroethylene copolymer as a film to be adhered to the surface of a zinc steel plate, ZnSt, or stainless steel plate (ST). Was chosen as the one.

According to the results of the experiment, it was confirmed that the fluororesin film did not deteriorate even if it was spilled, and that it could be easily wiped off with a cloth even after a lapse of time. In addition, soy sauce, oil, and the like do not permeate into the film, and the clean feeling is maintained forever.

Further, the zinc steel plate and the stainless steel plate have a higher strength against heat than aluminum, and have a corrosion degree comparable to that of aluminum due to heat. As a result, the zinc steel plate and the stainless steel plate have higher durability than when aluminum is used.

[0028]

According to the method of the present invention, the surface of a zinc steel plate ZnSt and a stainless steel plate ST is treated with a fluororesin film F · film so that dirt such as boil-off, soy sauce, oil, etc. can be more easily compared with kitchen utensils such as an aluminum gas range. Can be wiped off. Also, the strength against heat is large.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first step,

FIG. 2 is an explanatory view of a second step,

FIG. 3 is an explanatory view of a third step,

FIG. 4 is an explanatory view of a fourth step,

FIG. 5 is an explanatory view of a fifth step,

FIG. 6 is a perspective view of a gas range,

[Explanation of symbols]

Zn: zinc plating, ZnSt: zinc steel sheet, F ・ fil
m: Fluorine film, Sb: Sandblast, ST: Stainless steel.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B32B 15/08 102 F24C 15/10 F24C 15/12

Claims (2)

(57) [Claims] In a first step, a zinc-plated surface of a flat zinc-plated steel sheet is sandblasted with about 80 mesh, and in a second step, it is immersed in a hydrochloric acid aqueous solution having a concentration of about 14% for about 10 seconds. As a fourth step, the surface of the water-washed zinc steel sheet is coated by applying heat at 340 ° C. to the surface of the water-washed zinc steel sheet as a fourth step. A surface treatment of a galvanized steel plate or stainless steel kitchen equipment such as a gas range, wherein the plate is baked at about 10 ° C. for about 10 minutes and, as a sixth step, a zinc steel sheet covered with the fluororesin film is formed into a required shape. Method. 2. The method according to claim 1, wherein a tetrafluoroethylene copolymer is used as the fluororesin film.