Method of automatically setting the colors printed out by flexog

Details Method of automatically setting the colors printed out by flexog Method of automatically setting the colors printed out by flexog

1985-11-27

1987-05-26

Fisher, J. Reed

Printing

Multicolor

Processes

101181, B41M 114, B41F 516

Patent

active

046675965

ABSTRACT:
A method of automatically setting the colors printed with yellow, magenta, cyan and black printing inks for four-color printing by flexographic printing machines having printing units provided with plate and backing cylinders is characterized in that, to determine the desired color value in a color triangle which serves for color comparison and the corners of which are fixed by the colors yellow, magenta and cyan, the color location is determined for a test grid area which is printed out by all the printing units and in which each of the printing inks participates with a color proportion between about 40% and 60%, that to determine the existing value of the color by densitometric measurement the proportions of printing inks actually present are measured in the test area and the color location of the existing value is determined in the color triangle, that from a comparison of the color locations the departures of the existing values of the color proportions from the desired values are determined for each color, and that the axial spacing of the plate cylinder for the respective color from the backing cylinder is changed according to said departures until the existing and desired values in the triangle coincide.

REFERENCES:
patent: 2969016 (1976-01-01), Crosfield et al.

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