About Us Shanghai Xinxing Twin Screw Machinery Co. , Ltd. ( hereinafter referred to as `` Xinxing") specializes in manufacturing moldable extrusion machinery and plastic supplemental machinery . The existing elementary products cover SJSZ series cone ( ultra-cone ) -shaped twin-screw extruders , SJW series single-screw extruders , PVC-U core foaming pipe units , high-velocity PVC surd pipe units , profiled bar units , PVC granulator units , SJW series single-screw extruders , as intimately as these production lines of PVC wood plastic cabinet sheets , PVC wood fictile foaming sheets for doors , PE and PPR pipes , PE thick plates , PC hollow grid plates , PVC and PE bellows , PE and PP recovery , cleaning , and pelleting .