Dampener for lithographic printing plates

Details Dampener for lithographic printing plates Dampener for lithographic printing plates

1974-06-17

1976-02-10

Fisher, J. Reed

Printing

Planographic

Dampeners

B41L 2502, B41F 726

Patent

active

039371417

ABSTRACT:
A method and apparatus for delivering a controlled quantity of dampening fluid to a lithographic printing system comprising a smoothly finished transfer roller having a hydrophilic surface mounted in pressure indented relation with a metering roller having a smooth resilient surface. Pressure between the metering roller and transfer roller is adjustable to control the thickness of a film of dampening fluid metered therebetween onto the surface of the transfer roller. The film of dampening fluid is urged at controlled pressure into engagement with a film of ink on a roller in the printing system forming an interface between the films. Force is transmitted through the interface to rotate the transfer roller at a surface speed to maintain predetermined proportions of ink and dampening fluid on the roller surface.

REFERENCES:
patent: 3026795 (1962-03-01), Dietrich
patent: 3106154 (1963-10-01), Saul
patent: 3168037 (1965-02-01), Dahlgen
patent: 3259062 (1966-07-01), Dahlgren
patent: 3343484 (1967-09-01), Dahlgren
patent: 3433155 (1969-03-01), Norton
patent: 3508489 (1970-04-01), Norton
patent: 3587460 (1971-06-01), Chambon
patent: 3647525 (1972-03-01), Dahlgren
patent: 3749011 (1973-07-01), Abendroth et al.

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