The method of applying a protective coating on the metal surface in contact with food products

 

(57) Abstract:

The invention relates to the field of applying a protective non-stick coatings on metal products in contact with food products, and can be used to apply protective coatings on household utensils that previously were in operation. The method of applying a protective coating on the metal surface in contact with food products, includes sandblasting, coating PTFE composition, followed by heat treatment, and before sandblasting produce two firing: the first at a temperature of 410-430oC for 10-15 min, the second at a temperature of 460-480oC for 10-15 minutes the Invention allows to improve the quality of the coating and to reduce the cost of technology.

The method of applying a protective coating on the metal surface, in contact with food.

The invention relates to the field of applying a protective non-stick coatings on metal products in contact with food products, and can be used to apply protective coatings on cookware economic, previously were in operation.

The known method of repair postreperfusion with a subsequent heat treatment of the coating at the temperature of the coating at a temperature of 250-300oWITH [I].

The method ensures the prevention of cracking glass cover.

However, this method of electric arc spraying titanium causes a significant temperature gradients on the surface up to 700oThat results in the through-porosity titanium matrix, melt the aluminum alloy substrate of thin-walled products, the penetration of metal ions to food contact surfaces.

The closest technical solution adopted for the prototype, is how to handle the internal surfaces of the baking forms, described in the patent of the Russian Federation 2025977 C1, publ. 09.01.1995, including sandblasting and coating PTFE composition, followed by heat treatment.

However, for processing household utensils, mostly pans, which have a metal surface contaminated with organic sediments, heat treatment leads to self-heating and destruction of the metal substrate.

In addition, the known method may not be applicable for thin-walled parts made of aluminum alloys, because of their low heat capacity.

An object of the invention is to improve the quality youcause sandblasting, the fluoropolymer coating composition and its subsequent heat treatment, according to the invention, before sandblasting produce two firing: at a temperature of 410-430oC for 10-15 min, the temperature 460-480oC for 10-15 minutes

The claimed invention meets the requirements of unity of invention, because the proposed set of optimal parameters of operations solves a single problem with obtaining a useful result.

A positive result is the following:

- prevents the possibility of melting of thin-walled workpieces of aluminum alloys containing significant amounts of oils and fats on the surface.

- superior quality thermal degreasing the metal surface before sandblasting.

- improved in-process technology, which ensure high quality degreasing the metal surface.

- reduced energy consumption and metal consumption in connection with the use of finished products, the coating which improves performance.

Manufactured factory party tableware business, formerly in use, to Cipriano PTFE. The results of extensive testing, which was subjected to the household utensils according to GOST 17151-81 positive, which allows to consider the proposal the applicant meets the criterion "industrial applicability". The proposed method of restoring the surface of the cookware has found a practical and widespread use, in Moscow.

Authors conducted a search of patents and scientific and technical sources did not reveal analogues method, characterized by a set of signs identical in its properties and the achieved result, which allows to consider the proposal of the applicant to the appropriate criterion of "inventive step".

The essence of the invention.

When heat-treated by a known method at a temperature of 430-530oWith the observed self-heating of the surface as a result of combustion of organic sediments, the temperature quickly rises to 800oWith and is melting the surface of household utensils.

Experimentally it was found that thermal degreasing should be a two-stage roasting: the first stage at a temperature of 410-430oC for 10-15 min and the second stage at a temperature of 460-480oC for 10-15 minuteso(C) required to permanently remove organic residues on the surface of the ware. Comes complete thermal oxidation of organic materials and degreasing the surface for 10-15 minutes is heatset products, providing a complete thermal oxidation of organic compounds.

As a result of burning the surface of the product and its porous structure purified from traces of oil and grease, subsequent operation of sandblasting with continuous flow coating process ensures the efficiency of the process as a whole.

An example of the method.

1. Frying pan with a diameter of from 18 to 36 cm of aluminum alloy, cast iron, steel, enameled in quantity 72 pieces are placed in an oven with electric heating. Then raise the temperature to 42010oC and maintained for 15 min, then the temperature was raised to 47010oC and maintained for 15 min, packetboat surface electrocorundum, applied fluoropolymer coating, and conducting heat treatment.

Separated from the sediments and sludge pan has an attractive appearance with a smooth surface and has a robust non-stick effect, easy to clean and Nagar again is not formed.

Sources of information

1. USSR author's certificate 1301869, class C 23 D 13/02, 1987.

2. The application for the invention of the Russian Federation 2002101170, C 23 D 13/00, from 21.01.02, prototype.

The method of applying a protective coating on the metal surface in contact with food products, including sandblasting, coating PTFE composition, followed by heat treatment, characterized in that before sandblasting produce two firing: the first at a temperature of 410-430oC for 10-15 min, the second at a temperature of 460-480oC for 10-15 minutes

 

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