Process for graining and anodizing a metal plate

Details Process for graining and anodizing a metal plate Process for graining and anodizing a metal plate

1995-09-27

1997-07-29

Gorgos, Kathryn

Electrolysis: processes, compositions used therein, and methods

Product produced by electrolysis involving electrolytic...

101459, 205139, 205153, 205206, 205213, 205219, 205921, 4284722, B41N 108, C25D 1116

Patent

active

056518714

ABSTRACT:
Smooth planar metal surfaces, usually an aluminum web, intended for a lithographic printing plate, are roughened by brush graining with fine abrasive particles which are hard and dense and have a radial or disk-like configuration such that the abrasive particles are forged into the surface of the metal forming cavities in which the abrasive particles remain embedded. The embedded abrasive particles are dislodged and removed from the cavities by subjecting the web to an anodic treatment employing electrolyte materials and concentrations, temperatures and voltage which will dislodge and remove the particles while retaining the surface texture or morphology of the as-roughened surface. The web is then subjected to a second anodic treatment under conditions which favor oxide formation in order to provide a final anodized product.

REFERENCES:
patent: 4183788 (1980-01-01), Fromson et al.
patent: 4561944 (1985-12-01), Sasaki et al.
patent: 4566952 (1986-01-01), Sprintschnik et al.

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