Process for processing subtractive offset plate

Details Process for processing subtractive offset plate Process for processing subtractive offset plate

G - Physics

03

F

G03F 7/30 (2006.01) G03F 7/016 (2006.01)

Patent

CA 2091681

ABSTRACT Disclosed is a method of making a subtractive offset printing plate, in which a subtractive offset printing plate containing at least a composite diazo photo sensitive material and a hydroxyl group-having acrylic copolymer in the photosensitive layer is imagewise exposed and the thus imagewise-exposed printing plate is automatically conveyed and developed with a developer with applying (a) developing brush(es) under pressure to the moving printing plate in the presence of the developer, the brush(es) being rotated around the axis vertical to the surface of the printing plate and being moved by reciprocating motion to the direction perpendicular to the moving direction of the printing plate and along the axis parallel to the surface of the printing plate. By the method, a good printing plate may be made, using a popular automatic additive developing machine of a particular system to which a subtractive developer involving few environmental problems is applied. - 31 -

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