PRODUCTION OF PLANOGRAPHIC PRINTING PLATE

PROBLEM TO BE SOLVED: To provide a method for manufacturing a lithography plate according to the DTR process, particularly so as to have low minimum density and high gradient with improved sensitometry by using ascorbic acid. SOLUTION: This method for manufacturing a lithography plate involves a sta...

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Bibliographische Detailangaben
Hauptverfasser:	JIYOSU BAESU, RIYUKU WABESU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR AUXILIARY PROCESSES IN PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY MATERIALS THEREFOR ORIGINALS THEREFOR PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a lithography plate according to the DTR process, particularly so as to have low minimum density and high gradient with improved sensitometry by using ascorbic acid. SOLUTION: This method for manufacturing a lithography plate involves a stage to generate an image forming element with a photosensitive layer containing a silver halide emulsion and an image receiving layer containing a physical development nucleus having a water permeability relationship with the emulsion layer on a carrier according to the indicated order for the exposure thereof as per image, and then develop the image forming element using at least 0.1mol/L ascorbic acid as a main developer and an alkaline developer containing as an auxiliary developer composed as a group of at least 0.015mol/L of 1-phenyl-3-pyrazoridon in the presence of a silver halide solvent. In addition, the method conforms to the silver salt diffusion transfer process where the developer contains at least 0.003mol/L of thiosulfate.