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US 5,807,658 AGranted
Self-cleaning, abrasion-resistant, laser-imageable lithographic printing contructions
AssigneePresstek, Inc.
InventorsErnest W. Ellis, Frederick R. Kearney
Life of this patent
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Abstract
Wet lithographic printing plates include a protective layer that provides protection against handling and environmental damage, extends plate shelf life, and entrains debris generated by ablation. The layer washes away during the printing make-ready process, effectively cleaning the plate and disappearing without the need for a separate removal process.
Claims13
A lithographic printing member directly imageable by laser discharge, the member comprising:
- a. a first printing layer having a hydrophilic surface and comprising a compound of at least one metal with at least one non-metal;
- b. a hydrophilic barrier layer overlying the hydrophilic surface;
- and
- c. a second printing layer, underlying the first printing layer, that accepts ink;
- wherein
- d. the layers overlying the ink-receptive layer are removed or rendered removable by imaging radiation whereas the ink-receptive layer is not;
- e. the ink-receptive layer is oleophilic;
- and
- f. the barrier layer is removable by fountain solution.
6 more elements
Dependencies are inferred from the claim text.