... production line is developed by absorbing 1990 west, the extruding machine is twin screw extruder. 1. The pipe production line is ... screw extruder. 2. The pipe production line adopt European advanced technology. Extruding machine is SJZ51/105 or SJZ65/132, 81/156, 92 ... screw extruder. 2. The pipe production line adopt European advanced technology. Extruding machine is SJZ51/105 or SJZ65/132, 81/156, 92 ...