Laminated backing structure for composite lithographic plate
AssigneeRJR Archer, Inc.
InventorsRichard Harry Dunnington, Carl Michael Viglianco, Wilkens, George Rudolph
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a composite lithographic product for use in medium to long-run printing applications consisting of the steps of providing a sheet of metal of between 0.004 to 0.008 inch thick and having a lithographic quality surface, treating at least one surface of the metal sheet to accept a sensitizing coating, providing a backing sheet and laminating the backing sheet to the untreated surface of the metal sheet.
Claims4
A laminated backing structure for a composite lithographic plate comprising a metal sheet and a backing structure which laminated backing structure comprises:
- (a) bonding layer consisting essentially of a thermoplastic resin bondable to the back of a lithographic grade metal sheet under the influence of heat and pressure;
- (b) an intermediate filler layer of a normally solid flexible organic polymeric material, which layer is resistant to water, ink and grease to provide a selected thickness to said backing structure;
- (c) an outer interleaving layer of a thermoplastic or thermosetting organic polymer having a smooth non-scuff surface which does not adhere to the metal surface of a metal surfaced lithographic plate under ambient conditions, and which does not become tacky under the conditions necessary to bond the bonding layer (a) to a lithographic metal sheet;
- said layers being bonded together to form a coherent laminated structure.
Dependencies are inferred from the claim text.