Keyless lithography with single printing fluid

Details Keyless lithography with single printing fluid Keyless lithography with single printing fluid

1993-08-11

1994-12-13

Burr, Edgar S.

Printing

Planographic

Dampeners

101451, 101350, B41F 736

Patent

active

053720679

ABSTRACT:
Keyless lithographic printing system with single printing fluid. A lithographic printing press has a blanket cylinder (101) and a plate cylinder (102) with a printing plate (100) mounted thereon, a form roller system (103) having at least one form roller rotationally contacting the plate cylinder (102), a printing fluid supply system for supplying a controlled composition of printing fluid to the form roller system (103). A reservoir system (110, 124, 126, 107, 128) is provided for containing the printing fluid, the printing fluid being a predetermined composition of dampening water and ink. A pickup roller (106) removes the printing fluid from the reservoir system, the pickup roller (106) having an oleophilic and hydrophobic surface. A drum roller (104) transfers the printing fluid to the form roller system (103), the drum roller (104) having an oleophilic and hydrophobic surface and interfacing with the form roller system (103). A roller (105) forms a uniform thin film of printing fluid on the surface of the drum roller (104), the roller (105 ) for forming the uniform thin film being in rotational contact with the drum roller (104) and the pickup roller (106). A printing fluid removal device (108) is provided for removing at least a portion of printing fluid from at least one of the surface of the drum roller (104) and a surface of the at least one form roller in the form roller system (103).

REFERENCES:
patent: 4619198 (1986-10-01), Moll
patent: 4864925 (1989-09-01), Van Kanegan et al.
patent: 5007341 (1991-04-01), Nakano et al.
patent: 5012737 (1991-05-01), Makino et al.
patent: 5107762 (1992-04-01), Fadner et al.
patent: 5113761 (1992-05-01), Okamura

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