A LITHOGRAPHIC PRINTING PLATE SUPPORT

摘要

A method for making a lithographic printing plate support is disclosed comprising the steps of : (i) providing an aluminum support; (ii) treating said support in an aqueous solution; (iii) graining said treated support in an electrolyte solution by applying an alternating voltage thereby inducing a local current density J; characterized in that said local current density J at time t fulfilles the following equation : J(t) =a + bQ(t) for t=o to t=t_f and wherein Q(t) is the integrated value of the absolute value of the local current density at time t:(I) - a is equal to 5 - b is equal to 10 - and t_f is the time necessary to obtain a value of Q(t) equal to 50 C/dm².