There are a few guidelines that need to be followed to ensure operation:
•Due to the heat developed during printing, the preprint shall meet the requirements applicable for preprinting on paper intended for laser printing. OCR-blind ink shall be used.
•Ink used for preprinting on the thermal side shall be non-abrasive.
•The ink shall not smear while wound up on the supply roll, or during the printing process.
•Ink used for preprinting in the black mark zone and in the centre of the paper on the non-thermal side shall have no influence on the reflective IR-sensor. OCR-blind ink shall be used.
Print side
preprint is not recommended in the black mark zone on the inner side unless the above conditions are met.
Paper low sensor area
No preprint is allowed on any side of the paper in a 2-mm wide area from the edge of the roll.