Method for electrostatic assistance in printing processes, and printing machines having electrostatic substrate contact pressure

US4208965A · kind A · utility

Inventors

• Helmut Eichler · Oberkirch, DE
• Franz Knopf · Bühl, DE

Key dates

• Filing date: Mar 24, 1978
• Grant date: Jun 24, 1980
• Expiry date: Mar 24, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S101/37
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method for electrostatic assistance of the printing process in printing machines, in which method a printing substrate, being of a material which is not electrically conductive, is passed between a printing cylinder coated with printing ink and a contact pressure roller which mechanically presses the substrate against the cylinder and which is provided with a non-conductive or weakly-conductive outer layer, during which procedure the application of a high voltage between the printing cylinder and at least one of the electrode arrangements running in a longitudinal direction to the contact pressure roller results in electrons and ions being sprayed by corona discharge onto the surface of the contact pressure roller, which, as a result of its rotating and/or its intrinsic conductivity conveys these charged particles into the printing gap and enables them to flow off over this gap, and also a corresponding printing machine.