First, CX320 prints image onto receiving layer of re-transfer film. Second, it laminates(re-transfers) the image from base film on re-transfer film onto card surface.
CX320 does not print on hard surface plastic card, prints on flexible re-transfer film.
In case foreign particle was on the re-transfer film, it is sunk into soft rubber roller and does not scratch surface of print head.
PVC cards
The surface of PVC card is porous.
Dye inks can penetrate only porous surface.
Non-PVC cards
Generally, the surface non-PVC cards (Polyester, Polycarbonate, ABS) is not porous. CX320 prints on dedicated receiving layer on re-transfer film instead of card surface, and then, laminates (re-transfer) re-transfer film with printed image onto card surface.
IC cards