Method for coating metal cookware

Details Method for coating metal cookware Method for coating metal cookware

1993-04-29

1995-05-02

Pianalto, Bernard

Coating processes

Spray coating utilizing flame or plasma heat

Metal or metal alloy coating

427236, 427238, 427239, 427328, 427422, 427427, 427455, 427580, B05D 306

Patent

active

054117712

ABSTRACT:
A method for coating metal cookware includes (a) roughening and cleaning a cooking surface of the metal cookware's inner wall by spraying aluminum oxide of 60-80 mesh onto the inner wall surface; (b) applying a mechanically resistant layer onto the roughened and cleaned cooking surface of the metal cookware by electric-arc spraying at a temperature of 4500.degree.-8000.degree. C., under a pressure of 5-8 kg/cm.sup.2, and with a voltage of 30-40 V and a direct current of 100-300 A, the mechanically resistant layer being made of a metallic material, and (c) applying a lubricative layer, which consists essentially of PTFE (polytetrafluoroethylene), onto the mechanically resistant layer by spray coating until the lubricative layer has a thickness of about 23-36 .mu.m and whereby a pencil hardness of 8-9H is achieved.

REFERENCES:
patent: 3900684 (1975-08-01), Edwards
patent: 4070525 (1978-01-01), Vassiliou
patent: 4196256 (1980-04-01), Eddy
patent: 4252859 (1981-02-01), Concannon
patent: 4395445 (1983-07-01), Gebayer
patent: 4568573 (1986-02-01), Sunada
patent: 4683168 (1987-07-01), Hares
patent: 4808490 (1989-02-01), Tsukuda
patent: 4862609 (1989-09-01), Ulrich

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