Vaw Aluminum Ag

Helmut Schmiedel

Wolfgang Von Asten

Barbara Grzemba

J&uuml;rgen Kaulen

The invention relates to a printing plate substrate made of a rolled and embossed aluminum strip, wherein the surface has depressions with an average diameter of <25 &mgr;m and an aspect ratio of <1.5 (ratio length/width relative to the transport direction of the strip). The number of depressions is >2,500/mm,. The invention also relates to a method of making an aluminum printing plate substrate, wherein the surface of the aluminum strip is roughened using rollers. The surfaces of the rollers have microscopically small, stochastically distributed, dome-shaped projections. In cross-sectional view, the rollers have a round ridge-shaped roughness profile. The invention is also directed to an offset printing plate, wherein a printing plate substrate is produced with the method and provided with an anodically deposited oxide layer. A light-sensitive hydrophobic, oleophilic layer is deposited on the oxide layer.

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Frechen, Germany

Helmut Schmiedel