printing of the face value and other data on this labels makes delicate
their manipulation and, especially, conservation in mid term
basis. In special the excessive lighting exposure, the
and humidity will also degrade the printing and adhesive.
The quality of the thermal paper used in the manufacture of the labels is a key factor to determine his durability ; so the papers used in the first models, of much poorer quality, have taken step at the present time to the use of a paper of much better quality and than, therefore, it will allow the better conservation. Nowadays papers of thermal type exist already that allow one long conservation during many years without no special care, but its high cost seems to be that it disables, at the moment, its use in the manufacture of the labels.
The labels include surface treatments, as the processing with phosphorus for their recognition by the cancellation machines. In general, the models that have presented more problems of conservation have been those that the surface processing or the own design occupies all the surface of the label (models 2 and 3). At the present time already all the ATM designs include a white strip in the inferior zone for the printing of the face value and other data.
The printing of the data that appear in the ATMs makes through a thermal printer lodged inside the franking balance. The paper of the label incorporates a layer thermal sensible for black images; the image appears between 70º and 80º, obtaining the maximum density to 100º. Of course the malfunction or not of the printer is equally basic to obtain a printing of the maximum quality and density.
In order to maintain the thermal ATMs in good condition during years, it's good to follow some recommendations :
A long term
experiment is being carried out to know the behaviour of several identical
labels (same model, franking balance and date of issue) stored with different
procedures and materials ; after the first year there was no any visible
difference among the labels and no degradation trace.
The used ATMs on the thermal type cannot be submerged in water to separate them of the paper and, therefore, it's necessary to keep them always adhered to the paper, preferably on a whole used cover.
© J. Jové - M. Sans. All rights reserved. This page was last updated : 22.01.02