Process for the manufacture of photopolymer plates

US5135827A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Dieter Böhm · Wertheim, DE
• Raimund J. Faust · Wiesbaden, DE
• Joachim Gersdorf · Wiesbaden, DE
• Rudolf Petry · Wiesbaden, DE
• Hans-Joachim Schlosser · Wiesbaden, DE

Key dates

• Filing date: Feb 13, 1991
• Grant date: Aug 4, 1992
• Expiry date: Feb 13, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/136
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A continuous process for the manufacture of photopolymer plates having a precise and constant thickness in which the components of the photopolymer layer are melted in a screw extruder, the melt is conveyed to the sheet die by means of a gear pump and then into a roll gap of a calender, wherein the melt leaving the sheet die does not form a rotating bead in the calender gap downstream therefrom. The photopolymer plates prepared in this manner have high homogeneity of the components of the photopolymerizable mixture, have a highly precise and constant thickness, are transparent, do not tend to form specks and guarantee a long shelf life.