High temperature and sticky free L bar sealing knife, sealing action without smoking and burned. Sealed part is tidy and clean.  Covering Teflon on the sealing knife. After sealing action, packing product go in the shrink tunnel automatically by the conveyor belt. Conveyor belt is adjustable on the high by a hand roller. Sealing time is controlled accurately by time delay. Double electromagnets make stronger pressure. Adjustable film layer with needle device on, it is able to fit different size film, max 550mm. Up sealing frame controlled by cylinder. Sealing knife has hot protection device on. Matching with shrink tunnel can reach a high packing speed.