On the LISIM inlet, after the clip closer, are mounted two measuring wheels which are mounted on rotary encoders.The wheels are measuring the actual speed of the line, because they are in contact with the cast film. The measured speed is used for a feed forward and a feed backward control to reduce the jerking of the cast film. Until now the control is not activated, because the motor shift in the preheat zone and the reduced cogging forces of the BMS04, are leading to a tolerable inlet speed variation level.