B - Operations – Transporting – 41 – L
Patent
B - Operations, Transporting
41
L
101/72
B41L 15/10 (2006.01) B41F 5/24 (2006.01) B41F 33/00 (2006.01)
Patent
CA 1199521
Abstract A method of automatically setting the colours printed with yellow, magenta, cyan and black printing inks for four-colour printing by flexographic printing machines having printing units provided with plate and backing cylinders is characterised in that, to determine the desired colour value in a colour triangle which serves for colour comparison and the corners of which are fixed by the colours yellow, magenta and cyan, the colour 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 colour proportion between about 40% and 60%, that to deter- mine the existing value of the colour by densitometric measurement the proportions of printing inks actually present are measured in the test area and the colour location of the existing value is determined in the colour triangle, that from a comparison of the colour locations the departures of the existing values of the colour proportions from the desired values are determined for each colour, and that the axial spacing of the plate cylinder for the respective colour from the backing cylinder is changed according to said departures until the existing and desired values in the triangle coincide.
423673
Dotzel Klaus P.
Eschmeier Heinz
Marks & Clerk
Windmoller & Holscher
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