... BOPP, PET, CPP, PVC, AL foil and paper, with PLC,automatic tension control,EPC GOOD PRICE READY MACHINE High speed ... unwinding transmission belt is govemed by a vector motor, and PLC can automatically calculate the unwinding roller diameter, which can achieve ... a vector motor, adjusted by vector freque-ncy inverter and PLC can automatically calculate the rewinding roller diameter, which can achieve ...