Lithographic printing plate preparation

Details Lithographic printing plate preparation Lithographic printing plate preparation

1976-07-13

1978-05-02

Coughenour, Clyde I.

Printing

Planographic

Lithographic plate making, and processes of making or using...

101459, 101462, 101467, 346135, B41C 110, G01D 1508, G01D 1520

Patent

active

040868532

ABSTRACT:
In addition to having two lithographic layers of complementary lithographic character, an electrically inscribable lithographic printing blank may be provided with a solid but solvent-removable protective surface layer serving to inhibit spurious abrasion of the underlying layer during inscription of the blank and prior handling and storage. To prepare a printing plate from the blank, an electric current is passed between the blank and an electrical stylus so as to inscribe through the protective layer and immediately underlying layer and expose the bottom layer locally, whereafter the protective layer is removed by treatment with solvent to expose the surface of the underlying layer.

REFERENCES:
patent: 3263604 (1966-08-01), Dalton
patent: 3309990 (1967-03-01), Klupfel et al.
patent: 3315600 (1967-04-01), Tomanek
patent: 3739088 (1973-06-01), Landsman

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