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Mettler-Toledo Impact M Compact Scale Manual

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Chapter 4: Labels
Preprinted Labels
4-7
Preprinted Labels
To ensure trouble free operation of the printer gap sensor, and to achieve normal print
head life, no pre printing should be placed on the label in the gap sensor path or in areas
which will be printed by the scale printer. See Figure 7. However, since preprinting is
commonly used by many customers the following guidelines must be followed.
1. Inks used for preprinting must be specially formulated for use in thermal printers. If
proper inks are not used they can adhere to the print head. This ink build up on the print
head will interfere with heat transfer from the print head to the paper and cause printing
elements to burn out. Another problem with inks not formulated for thermal printing is
that they can contain chemicals which will cause the glass overcoat to chip off of the
print head, causing failure to print in the chipped areas.
2. If black ink is used in preprinting in the gap sensor path shown in Figure 7, a dense
black stripe will have to be printed on the back of the liner, as shown in Figure 8, to
prevent the gap sensor from being affected by the black preprinting. (Colors other than
black might also be a problem and should be tested by the customer) The black stripe
must have gaps which correspond to the label gaps. The black stripe on the liner must
have a minimum transmission optical density of 2.3 and must be uniform. (see optical
density – page 8) In addition, the gap sensor circuit will need to be adjusted for operation
with the black stripe as explained in the product service manual. This adjustment will
need to be checked any time label paper is changed, for example when labels are
procured from a new supplier.
3. If an optical density of at least 2.3 cannot be achieved in the black stripe on the back
of the liner, the liner width should be increased (as shown in Figure 9) so that the
preprinted label is not in the gap sensor path. For the Impact S, the sensor path in the
center of the label must be free of black preprinting.
No Dark Preprinting in
this area
FIGURE 9
… 125 …


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