Erasable printing form

US5454318A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Alfred Hirt · Munich, DE
• Barbara Nussel · Rochester, US
• Robert Weiss · Gersthofen, DE

Key dates

• Filing date: Oct 20, 1993
• Grant date: Oct 3, 1995
• Expiry date: Oct 20, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41N1/006
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A method for producing an erasable printing form by making the outer layer of the printing form from a material containing strong micro-dipoles, preferably a ferroelectric material, in particular a ferroelectric ceramic. In wet offset printing, the non-printing areas of the printing form are rendered hydrophilic by a hydrophilizing agent and they are maintained during the entire printing process. Plate cleaners can, for example, be used as the hydrophilizing agents. The printing form can be erased by a nonpolar solvent and can be reused again by rendering the non-printing areas hydrophilic again.