Because there are a lot of label, it must be able to withstand the time test, long-term no variant, words must be long-term preservation, not fade, not by coming into contact with the solvent will wear, not because of high temperature deformation change color and so on, 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 can not meet, Laser printing could not be achieved, and the effect of the needle and the original design could not meet the requirements, so there was the emergence of heat transfer printing technology.
