Manual Mettler-Toledo bPro (page 62 of 74) (English)

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METTLER TOLEDO bPro

User's Guide

4-12

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 following figure). 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 the figure below, a

dense black stripe will have to be printed on the back of the liner, as shown in the Black

Stripe figure, 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. 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.

GAP SENSOR PATH BLACK STRIPE

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Mettler-Toledo bPro Manual

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