What should I pay attention to when vacuum aluminizing printed plastic film?

1. For vacuum aluminized plastic films, except BOPET polar film or PVC semi-polar film, the surface tension of other plastic films needs to be above 42~50dyn. Secondly, when the printed plastic film is aluminized, in addition to coating vinyl chloride or propylene vinyl resin, chlorinated polypropylene composite gravure plastic ink should also be printed.

2. Because the surface ink printed on the surface of plastic film requires good gloss and high finish, it is not conducive to compounding. The adhesion of aluminized layer to surface ink is small, and the fastness of aluminized layer will be poor. Therefore, vacuum aluminizing can only choose extinction and composite internal ink.

3. The statement that "if the printed matter turns black and loses luster after vacuum aluminizing, it is because the ink has poor heat resistance" is a subjective inference without actual observation. Anyone who has seen and operated vacuum aluminizing knows that the temperature of vacuum aluminizing room is lower than 50 degrees. After vacuum aluminizing, due to the poor coverage of ink layer, the color of printed matter becomes dark and loses its luster. Therefore, we must pay attention to the hiding power of ink on vacuum aluminized printing film.

4. The surface tension of plastic ink is not high, and the firmness of vacuum aluminum plating on the ink layer is inherently worse than that of optical film. Therefore, when vacuum aluminizing is carried out on the fully printed ink layer, the firmness of the aluminum layer will be worse. The less ink on the printed film used for vacuum aluminum plating, the better. Printed patterns should be designed as hollows to avoid designing full-page printed patterns. The vacuum aluminized packaging with full-page field printed patterns not only has poor aluminum coating firmness. Increasing the packaging cost will also increase the residue of ink and solvent and increase the chance of polluting the inner packaging, which is a typical packaging case with poor application.