Printing – Planographic – Dampeners
Patent
1990-10-01
1991-09-10
Fisher, J. Reed
Printing
Planographic
Dampeners
1014501, B41F 726, B41F 732, B41L 2502, B41M 2518
Patent
active
050464175
ABSTRACT:
A tray contains frothed or bubbly solution for applying to a printing cylinder plate and a cylindrical pan roller having a microporous outer layer is continuously rotated in the frothed solution to continuously absorb or pick up small amounts of the solution. Solution is transferred from the pan roller to a metering roller, having a surface of highly polished chrome, by rolling contact between the two rollers. In turn, the metering roller transfers liquid to a form roller which has a microporous outer surface in rolling contact with a printing plate mounted on the printing press printing cylinder for depositing the liquid solution onto the printing plate as the printing cylinder rotates. The pan roller and the form roller have hollow cores and pressurized air at a very low pressure is applied to the cores to uniformly spread the liquid throughout the microporous surface for uniform distribution. The form roller is provided with air vanes or blades mounted around its shaft and pressurized air is applied to the air vanes to insure that the form roller continues rotating even when not in contact with the rotating printing plate.
REFERENCES:
patent: 4016811 (1977-04-01), Zavodny
patent: 4048919 (1977-09-01), Woods
patent: 4724764 (1988-02-01), MacPhee et al.
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