Printing unit cylinder for rotary offset printing machines and m

Details Printing unit cylinder for rotary offset printing machines and m Printing unit cylinder for rotary offset printing machines and m

1985-11-25

1987-02-17

Fisher, J. Reed

Printing

Printing members

Blanks and processes

101375, B41F 1308

Patent

active

046430954

ABSTRACT:
A printing unit cylinder of a given diameter for offset rotary printing machines having a galvanically applied wear and corrosion-resistant jacket surface coating, comprising a cylinder body formed with a cylinder channel and having a transitional surface from a cylindrical jacket surface thereof to the cylinder channel, the cylindrical jacket surface and the transitional surface having a sand-blasted surface roughness of 10 to 20 microns, a nickel undercoating having a hardness of 180 to 220 Vickers hardness disposed on the cylindrical jacket surface and the transitional surface; and a chromium layer disposed on the undercoating and having a hardness of greater than 900 Vickers hardness and a microcracked surface of greater than 400 cracks per cm.sup.2, the cylinder body having a diameter less than the given diameter of the printing unit cylinder by a thickness corresponding to the superimposed thicknesses of the nickel chromium and the chromium layer.

REFERENCES:
patent: 2114072 (1938-04-01), Cleveland

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