Method and apparatus for development of lithographic printing plate precursor
AssigneeEastman Kodak Company
InventorsKoji Hayashi, Chiaki Nakamura, Eiji Hayakawa
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Abstract
To provide a development system for lithographic printing plate precursors using a neutral developer, capable of preventing the non-image area of the resulting printing plates from being stained. In developing a lithographic printing plate precursor with a neutral developer having a pH of from 5.8 to 8.6, ultrasonic waves and/or an electric current are imparted to the neutral developer.
Claims13
A method for developing a lithographic printing plate precursor that comprises an image-forming layer comprising an unsaturated double-bond containing substance, a graft polymer that has a poly(alkyleneoxide) unit in the side branch thereof, and a photothermal conversion substance, said method comprising:
- developing said precursor with a neutral developer having a pH of from 5.8 to 8.6 in combination with a means for removing non-imaged parts of said lithographic printing plate precursor, while said neutral developer is subjected to ultrasonic waves at a frequency of from 10 to 100 kHz and an output of from 10 to 400 W,
- wherein the removing means is a brush roller, morton roller, or developer-jetting nozzle.
Dependencies are inferred from the claim text.