Patent ID: 6344131
Filing Date: 2002-02-05
Classification: B41N,C25F

Abstract:
A method of roughening an aluminum support made of an aluminum plate electrochemically in an acidic aqueous solution using an electrolytic apparatus comprising plural cathodes and anodes arranged alternately on one side of the aluminum plate by applying DC voltage, which comprises providing a soft starting zone by roughening the aluminum plate at a current density of 0.01 to 100 A/dm2, which is lower than any subsequent main roughening, for a period of 0.1 to 1 second at a first stage of roughening the aluminum plate, and roughening the aluminum plate at a low current density in the soft starting zone, wherein the DC voltage for the roughening is provided by at least one electrode connected to an electric power supply in the soft starting zone and by a separate main electric source and electrode or electrodes,wherein the soft starting zone comprises at least one electrode connected to an electric power supply for electrolysis at 0.01 to 100 A/dm2, wherein said at least one electrode connected to an electric power supply for electrolysis at 0.01 to 100 A/dm2 is separate from a main electric source and electrode or electrodes used for electrolysis, wherein a first main electrode is a cathode.