METHOD FOR OBTAINING PRINTING PLATE ACCORDING TO METHOD OF SILVER SALT DIFFUSION TRANSFER

摘要

PURPOSE: To provide a method for manufacturing a printing plate according to a silver salt diffusion transfer reversal method by automatically using a camera plate maker and to provide a method for manufacturing the printing plate according to the silver salt diffusion transfer reversal method by which dipping time in a developer is shortened. CONSTITUTION: A photographic material is constituted by containing a silver halide emulsion and a physical development necleus containing layer on a base. The manufacturing method of a lithograph printing plate according to the silver salt diffusion transfer reversal method by using the photographic material has a stage in which the photographic material is exposed in accordance with the image and the obtained photographic material exposed in accordance with the image is introduced into an alkaline processing soln. held in a developer tank to develop the material. The developer tank has a spreading means for supplying a new alkaline processing soln. to a side where the photographic material exposed in accordance with the image is supplied. The alkaline processing soln. contains an alkanol amine and a mesoionic compound.