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Chapter 4: Labels
Label and Liner Optical Density
4-15
Label and Liner Optical
Density
If liner paper transmits 2% of the light which is incident on it, the optical density
is log
10
(100/2) = 1.7
If the light transmitted through the liner is 3 times the light transmitted through the liner
and label, the relative optical densities are:
Optical Density of Liner + Label = log
10
(100 / X)
Optical Density of Liner Only = log
10
(100 / 3X)
= log
10
(0.3333X)
= log
10
0.3333 + log
10
(X)
= log
10
(X) – 0.48
Therefore, if the liner must transmit 3 times the light that the liner and label transmits,
the transmission optical density of the liner must be 0.48 less than the transmission
optical density of the liner and label.
Black Stripe Optical
Density
If only 0.5 % of incident light is transmitted through the black stripe, the optical density
is:
log
10
(100 / 0.5) = log
10
(200) = 2.3
The purpose of specifying a transmission optical density of at least 2.3 for the printed
black stripe on the back of the label is to minimize any variation in light transmission as
a result of black pre-printing on the front of the label. This variation due to black
preprinting can cause the gap sensor to give gap detection errors.
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