Marking the production date, bar code, QR code on PET film , choose UV laser To mark the production date, code, QR code and other information on the PET film, the non-ultraviolet laser is none other than the UV laser. Ultraviolet laser is a cold light source, and the thermal effect is particularly small during laser cutting or marking, and it is more suitable for surface processing of PET film that is more sensitive to thermal effects.