... drainage, cable laying, etc. The set consists of single screw extruder, vacuum calibrating bench, tractor, cutting machine, ... pipes, etc. The set consists of conical twin screw extruder, vacuum shaping box, tractor, cutting machine, ... single screw extruder machine, high speed extrusion, efficient plasticizing characteristics. 2. Barrier type two stage mixing PP - R special screw, slotting machine barrel ...