Apparatus for etching metallic sheet

Details Apparatus for etching metallic sheet Apparatus for etching metallic sheet

1981-03-30

1982-11-02

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

134 64R, 156640, 156644, 1566611, C23F 102

Patent

active

043571964

ABSTRACT:
A method for etching a metallic sheet and apparatus thereof with a first step of forming an anticorrosive pattern defining apertures on one surface of the metallic sheet and an anticorrosive pattern defining smaller apertures than the apertures on the other surface of the sheet; a second step of lightly etching the other surface for removing an oxide film on the surface of the metal to expose the surface of the metal; a third step of spraying an etching solution on the one surface for etching the one surface to a predetermined depth; and a fourth step of simultaneously spraying an etching solution on both surfaces of the metallic sheet for forming apertures in the metallic sheet. The invention is preferably applied for forming apertures by etching in a metallic sheet to provide a shadow mask of a color CRT.

REFERENCES:
patent: 3929551 (1975-12-01), Frantzen
patent: 4013498 (1977-03-01), Frantzen et al.
patent: 4124437 (1978-11-01), Bond et al.
patent: 4303466 (1981-12-01), Thoms

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