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Summary: |
Color Density Tracking and Control |
6.17.99
A video-based color density measurement system integrated with computerized press controls
can improve print quality, cut makeready time, reduce waste and speed production.
Two in-line video cameras can color bars on the edges of the web at full press speed. Data
are oversampled to allow paper and printing imperfections such as dirt, holes, hickies and
tick marks to be eliminated. These data are translated into a color density equivalent
which is displayed on a computer monitoring the press. The press operator can be alerted
to make adjustments in roller settings, ink and water levels, blanket packing, tension,
etc. to bring the color to desired values.
Color target densities have been able to be reached at one litho printer described in the
article in less than half the time and with 30-40% less waste than without the closed loop
color density control system.
Author: Stephanie Duschene
Source: Graphic Arts Monthly, May, 1999, p. S4-S6. |
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