Objective To assure that the instantaneous linear rate of the transverse seal chamber is the same as the feed rate of the film in the hot-seal packing machine. Methods A device capable of automatic error correcting was designed. The error correcting device was controlled using PLC in the EPC system. The system of tension controlled by the rubber-roll axis was investigated in which a magnetic powder brake was used as an executive element of tension. Results The scheme resulted in compliance of the film-drawing mechanism and the feed rate of the film. Conclusion The practical running results showed that the control system could grant the production line with higher operation speed and better stability.