process for continuously printing a plastic film includes the steps of applying to the back of the plastic film a temporary anti - sticking support , heating the assembly of the plastic film and the temporary support to a temperature such that the plastic film reaches its softening point to stick temporarily to the temporary sport , transferring by sublimation a design constituted by a sublimable ink pre - printed on a printing paper , by contact under predetermined temperature and pressure with the front of the plastic film therm - stuck to the temporary support , and cooling the assembly of the thus - printed plastic film and of the temporary support to a temperature permitting unsticking the temporary support .