Method of producing aluminum support for printing plate

Details Method of producing aluminum support for printing plate Method of producing aluminum support for printing plate

1992-03-09

1992-12-29

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 304

Patent

active

051748690

ABSTRACT:
A method of producing an aluminum support for a printing plate by electrochemical graining. The aluminum support is soaked in an acid electrolytic liquid of nitric acid or hydrochloric acid in preferred ranges. An alternating current including a t.sub.F positive period and a t.sub.R negative period is applied between the aluminum support and an opposite electrode, with current reach peak levels in the positive period t.sub.F and the negative period t.sub.R being reached within the initial range of 0.1-20% of either period.

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patent: 4686021 (1987-08-01), Nakanishi et al.
patent: 4919774 (1990-04-01), Minato et al.

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