Process for electrograining aluminum substrates for lithographic

Details Process for electrograining aluminum substrates for lithographic Process for electrograining aluminum substrates for lithographic

1976-11-04

1978-05-02

Edmundson, F.C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 304

Patent

active

040873412

ABSTRACT:
Aluminum substrates are electrograined for lithographic printing in an electrolytic cell using an electrolyte of hydrochloric acid or nitric acid, and a "regulated alternating current" whereby the inter-electrode voltage is applied with a higher anodic voltage than the cathodic voltage, the ratio of cathodic coulombic input to anodic coulombic input is less than one and preferably in the range of 0.3-0.8, and the anodic half cycle period or time is not longer than the cathodic half cycle period or time, thereby to impart to the substrate a "pits-within-a-pit" grain structure uniformly over its entire surface.

REFERENCES:
patent: 2901412 (1959-08-01), Mostovych et al.
patent: 3072546 (1963-01-01), Wruck
patent: 3330743 (1967-07-01), Jestl et al.
patent: 3861917 (1975-01-01), Magnotta et al.
patent: 3887447 (1975-06-01), Sheasby et al.
patent: 3892636 (1975-07-01), Keneda et al.

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