Method for etching shadow mask and regenerating etchant

Details Method for etching shadow mask and regenerating etchant Method for etching shadow mask and regenerating etchant

1975-06-30

1976-06-08

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

134 10, 156 18, 156 19, 156345, C23F 104

Patent

active

039620050

ABSTRACT:
This disclosure depicts a novel method of etching a shadow mask for a color television picture tube and in particular to a method of etching the steel substrate layer of a two layer shadow mask, wherein the first layer has been previously etched, and of reclaiming the used etchant. Ferric sulphate is used to etch the steel substrate layer, resulting in the generation of ferrous sulphate, a by-product of the chemical reaction of the ferric sulphate etchant and the steel substrate. The used etchant is reclaimed by reacting and mixing in a particular manner the used etchant with sulfuric acid and hydrogen peroxide.

REFERENCES:
patent: 3526560 (1970-09-01), Thomas
patent: 3574013 (1971-04-01), Frantzen
patent: 3775202 (1973-11-01), Meek et al.
patent: 3880685 (1975-04-01), Rehm et al.

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