Method of producing aluminum support for printing plate
AssigneeFuji Photo Film Co., Ltd.
InventorsAkio Uesugi, Tsutomu Kakei
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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.
Claims8
A method of producing an aluminum support for a printing plate by electrochemical graining, said method comprising the steps of:
- soaking said aluminum support in an acid electrolytic liquid;
- and
- assuming that t.sub.F is a positive period of an alternating current and t.sub.R is a negative period of an alternating current, applying, between the aluminum support and an opposite electrode, an alternating current including periods in which current reach peak levels in the positive period t.sub.F and the negative period t.sub.R, respectively, are reached within the initial range of 0.1-20% of either period.
Dependencies are inferred from the claim text.