ENGRAVING METHOD FOR PLANOGRAPHIC PRINTING PLATE

摘要

PURPOSE:To improve sensitivity and high plate wear by subjecting a photographic sensitive material provided with internal latent image type silver halide emulsion layers which are not fogged on a base to scanner exposing then to non-tanning developing in the presence of a fogging agent, then subjecting the silver halide part of the emulsion layers to a processing for lipophilicity impartation. CONSTITUTION:The photosensitive material provided with the internal latent image type silver halide emulsion layers on the base is subjected to the scanner exposing then to the non-tanning developing in the presence of the fogging agent and the silver halide part of the emulsion layers is subjected to the processing for lipophilicity impartation. The fogging agent is preferably incorpo rated into the photosensitive material to be made into a master plate and/or a developing agent and the amt. thereof is generally preferably in a 50 to 1,500 mg/mol Ag range in case of adding the fogging agent into the master plate or in a 0.05 to 5g/l range in case of adding the same into the developing soln. The high sensitivity and high plate wear are obtd. in this way.