Hoechst Aktiengesellschaft

Dieter Bohm

Hans-Joachim Schlosser

Joachim Gersdorf

Joachim Stroszynski

Gerhard Sprintschnik

Kurt Reiss

Walter Niederstatter

Rudolf Petry

Raimund-Josef Faust

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.

Process for the manufacture of photopolymer plates

Disclosed is a sheet, foil or strip material comprising aluminum or an alloy thereof, which is first mechanically and then electrochemically roughened on one or both surfaces to produce the following parameters:

Sheet material of mechanically and electrochemically roughened aluminum,

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Eltville, Germany

Dieter Bohm