Method for selectively deleting undesired ink-receptive areas on wet lithographic printing constructions incorporating metallic inorganic layers
AssigneePresstek, Inc.
InventorErnest W. Ellis
Life of this patent
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Abstract
To delete undesired ink-receptive areas on a wet lithographic printing construction, an oleophobic material is applied to the hydrophilic surface of the plate that has suffered contamination and/or scratching, and allowed to cure. So long as the hydrophilic surface is capable of permanently bonding the oleophobic deletion agent, the areas to which that agent has been applied will not accept ink.
Claims17
A method of eliminating an unwanted oleophilic area from a wet-printing lithographic member, the member comprising a hydrophilic, metallic inorganic surface layer and an oleophilic layer thereunder, the surface layer being substantially removed in an imagewise pattern, the method comprising bonding an oleophobic agent to the unwanted oleophilic area so as to render the area oleophobic during printing.
Dependencies are inferred from the claim text.