Patent ID: 7232645
Filing Date: 2007-06-19
Classification: B41N,C25F

Abstract:
1. A support for a lithographic printing plate obtained by performing graining treatment including electrochemical graining treatment on an aluminum plate, wherein said aluminum plate is an aluminum plate which is manufactured by a method including molten metal treatment, and contains Fe of 0.20 to 0.29 wt %, Si of 0.03 to 0.15 wt %, Cu of 0.032 to 0.040 wt % and Ti of 0.050 wt % or less and whose remaining portion is composed of Al and unavoidable impurities, and wherein surface area ratio and steepness obtained from three-dimensional data by measuring 512×512 points in 5 μm×5 μm on the surface with an atomic force microscope each satisfies the following conditions (i) to (vi): (i) surface area ratio ΔS (ii) surface area ratio ΔS (iii) surface area ratio ΔS (iv) steepness a45 (v) steepness a45 (vi) steepness a45 wherein ΔS ΔS ΔS steepness a45 steepness a45 steepness a45