Electrochemical roughening of aluminum for printing plates...

Details Electrochemical roughening of aluminum for printing plates... Electrochemical roughening of aluminum for printing plates...

C - Chemistry, Metallurgy

25

F

204/86.5

C25F 3/04 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01)

Patent

CA 1256058

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the electrochemical roughening of a plate of aluminum or an alloy thereof which is useful for a printing plate support, comprising the steps of (A) immersing the plate in an aqueous mixed electrolyte solution containing (i) from about 0.5 to 10% by weight HCl and (ii) a further inorganic acid comprising HF, such that said mixed electrolyte solution contains from about 0.05 to 5% by weight of HF; and (B) applying an alternating current to the plate to produce a uniformly roughened offset printing plate support. The very uniformly roughened support materials are used in the production of offset printing plates.

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