Method for making a lithographic printing plate according to the silver salt diffusion transfer process

The present invention provides a method for making a lithographic printing plate from an original containing continuous tones comprising the steps of: frequency modulation screening said original to obtain screened data image-wise exposing according to said screened data an imaging element comprisin...

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Bibliographic Details
Main Author ROMPUY; LUDO VAN
Format Patent
LanguageEnglish
Published 10.02.1998
Edition6
Subjects
APPARATUS SPECIALLY ADAPTED THEREFOR
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
MATERIALS THEREFOR
ORIGINALS THEREFOR
PHOTOGRAPHY
PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES
PHYSICS
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Summary:The present invention provides a method for making a lithographic printing plate from an original containing continuous tones comprising the steps of: frequency modulation screening said original to obtain screened data image-wise exposing according to said screened data an imaging element comprising in the order given on a hydrophilic surface of a support (i) an image receiving layer containing physical development nuclei, (ii) a photosensitive layer containing one or more silver halide emulsions being in water permeable relationship with said image receiving layer applying an aqueous alkaline solution to the imaging element in the presence of (a) developing agent(s) and (a) silver halide solvent(s), treating the imaging element to remove the layer(s) on top of said image receiving layer, thereby uncovering said silver image formed in said image receiving layer, characterized in that said aqueous alkaline solution is substantially free from thiosulphate ions and bromide ions and contains an aminoalcohol in an amount ranging from 0.1 ml to 10 ml/l aqueous alkaline solution.
Bibliography:Application Number: US19960760343