Manufacturing method of planographic printing plate support and

Details Manufacturing method of planographic printing plate support and Manufacturing method of planographic printing plate support and

1998-06-18

2000-04-04

Gorgos, Kathryn

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating substrate prior to coating

205172, 205658, 204DIG9, C25D 544

Patent

active

060456817

ABSTRACT:
Disclosed is a method of surface-roughening an aluminum support comprising the step of electrolytically surface-roughening an aluminum support in an electrolyte solution, supplying an alternating current with an alternating waveform having a positive polarity period and a negative polarity period in one cycle, and comprising arriving at the largest current value from a zero current value in the positive polarity period of one cycle and then falling, followed by rising to a current maximum in one cycle, wherein the time t.sub.1, which is required to arrive at the largest current value, has the following relationships:

REFERENCES:
patent: 5174869 (1992-12-01), Uesugi et al.
patent: 5264110 (1993-11-01), Atkinson et al.
European Search Report May 10, 1998.

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