User`s guide

Label Requirements
SPECIAL SHAPED LABELS
Labels with shapes other than rectangular will cause gap detection errors if the gap dimension in the
gap sensor path is outside the limits given in this document, or if the edge of the label shape
crosses into and out of the sensor path as shown below. For these cases the black stripe will have
to be printed on the back of the liner. Tests will be needed to determine if the stripe as shown earlier
will be adequate will be required (shown above).
The safe approach is to use the configuration shown increasing the width on all odd shaped labels.
Examples of ODD SHAPED LABELS which will cause
GAP Sensor problems
DEFINITION OF TRANSMISSION OPTICAL DENSITY
Transmission optical density is defined as:
Optical Density = log
10
(incident light / transmitted light) = log
10
(100 / % light transmission)
Transmission optical density can be measured with a transmission densitometer that meets ANSI
standards. Examples are the Macbeth model TD903 and TD932.
Optical density for 100% light transmission = log
10
(100/100) = log
10
(1) = 0
Optical density for 0.1% light transmission = log
10
(100/0.1) = log
10
(1000) = 3
5-8 UC-ST User’s Guide