Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1979-07-27
1981-05-26
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412975, C25F 306, C25F 314
Patent
active
042696798
ABSTRACT:
A process for engraving metal plates to be used as patterns for texturized products, in which the pattern to be reproduced is formed on a silk screen, the pattern formed on the screen is transferred to the previously roughened surface of the metal plate to be engraved by an acid-resistant paint, and the metal plate is subjected to electro-erosion in an inorganic acid bath, using as one electrode the metal plate itself, and as another electrode a plate of the same material or another material. When different engraving depths are required, the process is interrupted, with the already engraved portions being covered with the acid-resistant paint, and the uncovered portions being subjected to an electro-erosion engraving, this sequence being repeated until obtaining all depths required in the pattern desired.
REFERENCES:
patent: 1275408 (1918-08-01), Eaton
patent: 1362159 (1920-12-01), Weeks
patent: 2888391 (1959-05-01), Loughman
The Production of Printed Circuits and Electronic Assemblies, Edited by C. R. Draper, 1969 pp. 50-60.
Duratex S.A.
Tufariello T. M.
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