Pitted roll for an offset litho printing press

Details Pitted roll for an offset litho printing press Pitted roll for an offset litho printing press

1990-10-15

1991-03-26

Cuda, Irene

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291214, 291215, 291216, 291218, 291211, 29132, 101141, 101153, 101348, B41F 146

Patent

active

050018213

ABSTRACT:
A pitted roll for an offset litho press inking unit, more especially as part of a short inking unit, has a dual coating layer of which the inner layer is formed of a material such as copper comprising the application of a high affinity for ink and the outer layer is formed of ceramic material to give lands wiped by a doctor, preferably set at a negative angle, around the pits. A high wear resistance and a high accuracy may be achieved if the plain base member of the roll is coated with copper or the like and then with ceramic material, after which engraving takes place to penetrate the ceramic layer right into the copper or the material with an affinity for ink.

REFERENCES:
patent: 4009658 (1977-03-01), Heurich
patent: 4015100 (1977-03-01), Gnanamuthu et al.
patent: 4301583 (1981-11-01), Poole
patent: 4503769 (1985-03-01), Anderson
patent: 4601242 (1986-07-01), Fadner
patent: 4794680 (1989-01-01), Meyerhoff et al.
patent: 4819558 (1989-04-01), Counard

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