Hoechst Aktiengesellschaft

Heinz Boergerding

Joachim Stroszynski

Peter Lehmann

A mechanically roughened substrate is conveyed through an electrolytic bath and is given a superposed electrochemical roughening, which is carried out by means of electrodes which are arranged in the electrolytic bath at a specific spacing from the substrate. The electrodes are connected to corresponding windings on the secondary side of a three-phase transformer. The corresponding windings on the primary side of the three-phase transformer are connected to a three-phase frequency converter, to which three-phase current is applied via leads. The three-phase frequency converter transforms the line frequency of the three-phase current supplied into a frequency range of about 50 to 300 Hz at a voltage of between about 1 and 380 V.

Apparatus for roughening a substrate for photosensitive layers

Process and apparatus for roughening a substrate for photosensitive

The present invention relates to a roughened printing plate support of aluminum or an alloy thereof, which shows equally distributed tubular depressions. Furthermore, a process for the production of the printing plate-support is disclosed, in which roughening is performed in an acidic electrolyte by means of a pulsed direct current. The invention also relates to arrangements which are suitable for carrying out the process.

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Walluf, Germany

Heinz Boergerding