Hoechst Aktiengesellschaft

Vereinigte Aluminium-Werke Aktiengesellschaft

Vereinigte Aluminum-Werke Aktiengesellschaft

Wolfgang V Asten

Gerhard Sprintschnik

Kurt Reiss

Gunther Scharf

Barbara Grzemba

Walter Niederstaetter

Volker Wurstle

Karl H Dorner

Hartmut Scheel

The invention is directed toward a base material for aluminium offset printing plates having improved heat stability comprising an aluminum alloy consisting of from about 0.2 to about 0.6% by weight of iron, less than about 0.25% by weight silicon and copper combined, from about 0.1 to about 0.3% by weight manganese and the remainder being aluminum and trace production impurities, said base material further characterized as containing secondary precipitates in the form of phases of the Al Mn Si: Al Fe: Al Mn type which bear a ratio to one another of from about 1:1:2 to about 1:1:3, the mean particle size being from about 0.25 to about 0.010 micron with a maximum particle size of less than about 0.3 micron and further containing a precipitation structure with a degree of dispersion of less than about 50 phases per cubic micron and a process for producing such material. The sheet material according to this invention may be uniformly roughened in either HCl or HNO.sub.3 electrolyte baths under very similar process parameters.

Base material for an aluminum offset printing plate

An aluminum offset coil, having a surface zone of a predominantly recrystallized globular, fine grain structure, and a core zone of a greatly work-hardened structure, for use in offset printing plates, and a process for its preparation.

Aluminum offset coil, and method for its production

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Pulheim, Germany

Wolfgang V Asten