Putting It To Work; Comparing Colors - Delta CS2 Technical Information

CS2 Color Scanner

Putting It To Work

Comparing Colors

The CS2 is primarily intended for use in applications where
objects are 100% scanned for a deviation in average or
normal color, whether the deviation is a defect or a feature
that needs to be recognized.
It is possible to compare against a sample and activate the
limit outputs based on deviation from a sample.
Consider the hypothetical case where paper is being
manufactured for manila envelopes.
Currently, samples are taken to the lab on a regular basis and
tests are conducted to determine if the paper has the proper
beige color. The problems with the current system is that
the paper machines run continuously and at a rate that makes
it unfeasible to take samples often. On the other hand, if the
paper color goes out of spec., a tremendous amount of waste
can be created before the problem is identified and
corrected.
A CS2 was mounted above the flow of paper (web) inside of
a special wheel. One-half of the area of the wheel was
removed and the inside of the other half covered with a lab-
tested sample of the paper. The wheel is mounted just above
the web and rotated at the same speed as the web. The CS2
alternately looks at the web and the sample paper.
In this special case the concepts of Base color and Sense
color do not apply. Instead the CS2 colors were chosen to
correspond to the colors of the various dyes used in the
paper, and the outputs analyzed for differences between the
sample and the web.
The paper is still lab tested, but now, with the on-line
inspection, out-of-spec. color conditions can be found and
corrected immediately.
Delta Computer Systems, Inc., 11719 NE 95th Street, Vancouver, Washington 98682-2444 (360) 254-8688
email@deltacompsys.com http://deltacompsys.com
Traversing Heads
In the case of slow moving lineflow (baked goods, for
example), a 100% inspection can be done using a CS2 and a
traversing mechanism.
The outputs of the CS2 are connected to a controlling
computer which also reads the position of the CS2 as it is
moved back and forth across the lineflow.
A traversing head can also extend beyond the lineflow to
check against a reference color, as in the previous manila
envelope example.
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