Erosion process for generation of offset masters

Details Erosion process for generation of offset masters Erosion process for generation of offset masters

B - Operations, Transporting

41

C

101/61

B41C 1/10 (2006.01) B41N 1/08 (2006.01) B41N 3/03 (2006.01)

Patent

CA 1144418

abstract An improved lithographic printing plate includes a sub- strate layer of a nonconducting, hydrophobic polyester, an intermediate film of conducting, hydrophilic material such as aluminum and a top protective film of relatively hard hydrophilic dielectric material, such as aluminum oxide. .A printing image is formed in the lithographic printing plate by an electroerosion process wherein ero- sion electrodes are pulsed with voltage to break down the dielectric in areas adjacent to the erosion electrodes and to evaporate or otherwise remove corresponding por- tions of the conducting film, thereby creating holes that extend through the dielectric and conducting films and that expose portions of the surface of the underlying hydrophobic substrate. YO978-036

362742

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