Process for manufacturing support materials for offset printing

Details Process for manufacturing support materials for offset printing Process for manufacturing support materials for offset printing

1983-02-14

1985-11-19

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

204 33, 204 383, 204 42, 204 58, 430278, C25D 1112, B41N 108

Patent

active

045540578

ABSTRACT:
The process for manufacturing support materials for offset-printing plates is carried out in two stages. These materials are in the form of plates, foils, or strips, composed of aluminum, or an alloy thereof, which have been roughened by chemical, mechanical and/or electrochemical treatment. These two stages comprise an anodic oxidation in (a) an aqueous electrolyte based on sulfuric acid, and in (b) an aqueous electrolyte with a content of anions which contain phosphorus. An electrolyte with a content, in solution, of phosphoroxo anions, phosphorofluoro anions, and/or phosphoroxofluoro anions is employed in stage (b), and the treatment is carried out at a voltage between about 10 and 100 V, at a temperature of from about 10.degree. to 80.degree. C., and for a duration of from abut 1 to 60 seconds. The electrolyte is, in particular, an oxygen acid of phosphorus, or a salt with the above-mentioned anions. Following stage (b), it is also possible to carry out an additional treatment to impart hydrophilic properties to the support material.

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