Two-step method for electrolytically graining lithographic metal

Details Two-step method for electrolytically graining lithographic metal Two-step method for electrolytically graining lithographic metal

1987-04-27

1988-01-26

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 304

Patent

active

047215526

ABSTRACT:
An all electrolytic method for quickly and efficiently producing a well roughened, substantially non-directional, fine honeycomb surface on an aluminum sheet which is characterized by excellent adhesion to coatings and therefore suitable for making lithographic printing plates. The method comprises graining said aluminum sheet with alternating current for less than about 10 seconds in a first aqueous electrolyte solution containing hydrochloric acid, washing and drying the resulting grained aluminum sheet, and then further graining said dried aluminum sheet with alternating current for less than about 10 seconds, preferably 5 to 10 seconds, in a second aqueous electrolyte solution containing nitric acid alone or admixed with hydrochloric acid to obtain the substantially non-directional, fine honeycomb surface on said aluminum sheet.

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patent: 4477317 (1984-10-01), Chu et al.
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patent: 4525249 (1985-06-01), Arora
patent: 4547275 (1985-10-01), Ejima et al.
patent: 4548683 (1985-10-01), Huang et al.

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