Printing – Processes
Patent
1993-04-07
1994-05-10
Eickholt, Eugene H.
Printing
Processes
101229, 101231, 427211, 427288, 118 46, B41F 502, B05C 1100, B05D 100
Patent
active
053098390
ABSTRACT:
Method and apparatus for the varnishing and printing of sheets in a printing machine. A feed drum incorporates a counterpressure surface to form a first nip with an impression cylinder. As sheets are fed to the impression cylinder and transported through the first nip, a constant pressure at the first nip consistently transfers ink to a verso side of each sheet. Arranged thereafter, a varnishing cylinder supplied with a quantity of varnish contacts the impression cylinder creating a second nip. As the sheet passes through the second nip, the recto side of the sheet is coated with the varnish. The impression cylinder thus receives a constant pressure for transferring ink to the sheet independent of the pressure provided by the varnishing cylinder. Accordingly, even a partial or intermittent varnishing of the recto sheet side has no adverse effect on print quality, and the sheet does not have to be transferred from the impression cylinder to a separate varnishing unit.
REFERENCES:
patent: 2898851 (1959-08-01), Peyrebrune
patent: 3384011 (1968-05-01), olza-Schunemann
patent: 4414896 (1983-11-01), Fischer
patent: 4664949 (1987-05-01), Greiner et al.
patent: 4967660 (1990-11-01), Yamanari et al.
patent: 5103730 (1992-04-01), Sarda
Hartung Georg
Rother Michael
Eickholt Eugene H.
MAN Roland Druckmaschinen AG
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