SJ of single screw extruder machine SJ series of singel-screw extruder is outfitted with all kinds of screws which applies for processing PVC, PE, PPR, and PEX materials, etc. It has such features as high speed revolution, even plastification, high output, and small and beautiful shape with the devices of air expelling and water cooling, temperature auto-control and stepless speed regulationg.       SJ extruders are equipped with several kinds of machine head and auxiliary machine which are suitable for processing thermoplastic products such as membrane, soft (hard) pipe, rod, board, sheet and so on.