Patent ID: 7413844
Filing Date: 2008-08-19
Classification: B41N,C25F

Abstract:
1. A method of manufacturing a lithographic printing plate support comprising a surface which has: an arithmetic mean roughness R not more than 1.5 recesses with a depth of at least 4 μm per 400 μm square region; and a surface area ratio ΔS wherein S subjecting an aluminum plate at least to a first electrochemical graining treatment in a nitric acid-containing aqueous solution and a second electrochemical graining treatment in a hydrochloric acid-containing aqueous solution; and bringing the aluminum plate having undergone the first and second electrochemical graining treatments into contact with an alkaline aqueous solution to carry out alkaline etching treatment until the amount of a material removed by the alkaline etching treatment reaches 0.01 to 0.08 g/m