Patent ID: 9206494
Filing Date: 2015-12-08
Classification: B41N,C22C,Y10T

Abstract:
1. Strip for the production of a substrate for lithographic printing plates consisting of aluminum alloy, the strip having at least to some extent a microcrystalline surface layer due to hot and/or cold roll passes which has been treated with a surface etching treatment partly removing oxide particles prior to electrochemical roughening, wherein, prior to an electrochemical roughening of the strip, in a two-dimensional microprobe analysis according to the mapping method of a surface region of the microcrystalline surface of the strip, the surface portion with an intensity ratio wherein and during the two-dimensional microprobe analysis, an excitation voltage of 15 kV, a beam current of 50 nA and a beam cross section of 1 μm is used for a step size of 16.75 μm for the electron beam.