... 2.co-extruded Double-layer co-extruded drip irrigation belt production line Laiwu City Zhongda Plastic Machinery ... are obtained:Polymer pipe production line , Drip irrigation belt production line , Drip irrigation pipe production line , ... , Steel pipe anticorrosion production equipment , Single screw extruder , double screw extruder , Plastics canopy production equipment , Mulch film machine ...