Process for electrochemically modifying support materials of aluminum or aluminum alloys, which have been grained in a multi-stage process and use of these materials in the manufacture of offset-printing plates

摘要

The invention relates to a process for the abrasive modification of multi-stage roughened carrier materials made of aluminum or its alloys and the use in the production of offset printing plates, wherein the carrier material is mechanically roughened in a stage I, intermediate treated in a stage II, roughened electrochemically in a stage III, intermediate treated in a stage IV and anodized in a stage V. In stages II and / or IV, the intermediate treatment is carried out electrochemically using direct current. The anodization can be followed by a hydrophilization step VI.