Features: 1) Good vacuum system configuration2) No black line or wrinkle of the film for its high pumping speed, high efficiency,rewinding and unwinding automatic tension control system and adjustableextending system 3) The complete appliance adopts PLC control system 4) Human-machine interface 5) Meter counting for speed6) Digital display7) Constant voltage and automatic thermal retardation adjustment function forheating electrode, which is initiative domestic in China