Method and apparatus for roughening a support for radiation-sensitive coatings

US6261438A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Georg Haby · Liederbach, DE
• Gunter Hultzsch · Wiesbaden, DE
• Klaus Joerg · Schifferstadt, DE
• Uwe Gartmann · Eltville am Rhein, DE
• Jörg Kaden · Klingelbach, DE
• Hermann Idstein · Oestrich-Winkel, DE

Key dates

• Filing date: Dec 20, 1999
• Grant date: Jul 17, 2001
• Expiry date: Dec 20, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41N3/03
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for electrochemically roughening a support is disclosed to minimize the occurrence of surface discharges or electrical discharges on the support. A DC voltage acts on the support at the start of the movement of the support through the electrolyte bath. Subsequently, a three-phase or single-phase current acts on the support in the roughening zone. Three-phase electrodes are arranged in the electrolyte bath and are connected to the secondary of a three-phase transformer. The primary of the three-phase transformer is connected, via control transformers to a three-phase power transformer. A DC electrode is located upstream of the three-phase electrodes in the direction in which the support is transported through the bath. The DC electrode may be connected to the positive pole of a DC source while the negative pole of this DC source makes contact with the support.