Slur And Doubling - Techkon SpectroDens Manual

Slur and Doubling

With the measurement function Slur and Doubling printing deficiencies, caused by
inexact, geometrical transfer of the image from the plate to the paper can by evalu-
ated.
Slurring means that the printed dot deforms from the transfer of the printing plate
to the rubber blanket or from the rubber blanket to the paper. The effect of doubling
will be present when a printed dot is transferred a second time with less intensity
geometrically slightly offset. This ghost image is caused by ink being re-transferred to
the rubber blanket which should have stayed completely on the printed paper.
To make the slur and doubling measurement possible, it is necessary to have on the
color bar vertical and horizontal lined patches with identical line thickness as it is the
case with the print control strip TECHKON TCS.
K C
1.
K C
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K C M Y BAL S/D M+Y
K C M Y BAL S/D M+Y
2.
Manual TECHKON SpectroDens Chapter 2 – Measurement functions
Three measurements have to be carried out:
1. The first measurement on the vertical
lined patch; in this case of Magenta.
2. The second measurement on the horizon-
tal lined patch of the same process color.
After the measurement of the horizontal
lined patch the dot area of the patch is calcu-
lated and stored (see the following figure).