Four-color halftone printing process for objects having curved s

Details Four-color halftone printing process for objects having curved s Four-color halftone printing process for objects having curved s

1978-10-24

1980-12-30

Crowder, Clifford D.

Printing

Multicolor

Processes

101175, 101 40, B41F 1708, B41M 114

Patent

active

042416574

ABSTRACT:
A process of four-color halftone printing onto objects having a curved surface by means of dry offset printing which comprises transferring four images of yellow, magenta, cyan and black process inks having a difference of at least 1 in tackiness value from each other from four blocks onto two transfer areas provided on a blanket differently in the circumferential direction of a blanket cylinder in two layers two by two so that an image of an ink having the highest tackiness value and an image of an ink having the secondarily high tackiness value are transferred onto the first transfer area in that order and an image of an ink having the thirdly high tackiness value and an image of an ink having the lowest tackiness value are transferred onto the second transfer area in that order, and then transferring the images on the first transfer area and the images on the second transfer area in order onto the object having a curved surface in layers. Improved four-color halftone printing apparatus for objects having a curved surface is provided with a blanket cylinder having an effective printing surface of twice the size of the printing surface of the objects. The reproducibility of color and images is very excellent and the printing closely resembling the original can be obtained.

REFERENCES:
patent: 2972298 (1961-02-01), DeMarchi et al.
patent: 3255695 (1966-06-01), Johnson et al.
patent: 3593661 (1971-07-01), Tripp
patent: 3613571 (1971-10-01), Russell et al.
patent: 4035214 (1977-07-01), Shuppert et al.
Beverage World, "Improved Can Graphics Are No Illusion", p. 28, Aug. 1978.

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