Because there are so many labels, it must be able to stand the test of time; Long time variant, words must be long-term preservation, not faded, not because the contact solvent will wear or become angry because of high temperature deformation, etc., so it is necessary to adopt a kind of special printing media and printed materials to ensure that these features, general of ink-jet printing technology cannot achieve, laser printing, may be beyond the reach and needle dozen effect with the original design can't meet the requirements, then there is the emergence of the thermal transfer technology.
The principle of heat transfer printing：
Thermal transfer technology, simply put, is to use a special carbon belt, through similar to the working principle of the fax machine to print head, carried the carbon carbon powder coating after heating way, transfer to the paper or on other kinds of material, the carbon coating material of the belt can choose according to need, have strong adhesion, and print media choice, more can ensure printed handwriting is not affected by the outside world. And how the process of heating, heating, can be handed over to the computer to control, because have already developed a variety of software designed to print label, so, for the user, it is very convenient, especially in general to produce the barcode labels, bar code symbol of therefore has become an essential tool for this software.