Dampener for lithographic printing plates

Details Dampener for lithographic printing plates Dampener for lithographic printing plates

B - Operations, Transporting

41

F

101/60

B41F 3/32 (2006.01) B41F 7/24 (2006.01) B41F 7/26 (2006.01) B41M 1/06 (2006.01)

Patent

CA 1048340

DAMPENER FOR LITHOGRAPHIC PRINTING PLATES Abstract of the Disclosure 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 dampen- ing 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 inter- face to rotate the transfer roller at a surface speed to maintain predetermined proportions of ink and dampening fluid on the roller surface.

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