DEVELOPMENT REPLENISHER SUPPLEMENT METHOD OF AUTOMATICALLY DEVELOPING MACHINE FOR PHOTOSENSITIVE LITHOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a development replenisher supplement method of an automatically developing machine for a photosensitive lithographic printing plate by which variation of sensitivity of a developer to the change of a development treatment condition can be suppressed to the minimum.;SOLUTION: In the development replenisher supplement method wherein a large number of photosensitive lithographic printing plates subjected to exposure treatment are developed by using a developer containing an electrolyte and a development inhibitor and activity of the developer is kept constant, after the developer is supplemented with a development replenisher 1 whose electric conductivity is made higher than that of the developer and a development replenisher 2 whose development inhibitor concentration and electric conductivity are made higher than those of the developer according to a treatment condition, electric conductivity of the developer is measured and compared with an electric conductivity reference value obtained by serially calculating the electric conductive values. A supplement quantity setting value is increased or decreased according to the comparison result.;COPYRIGHT: (C)2006,JPO&NCIPI