... Reaming methods are online reaming, reaming machine. Double-wall corrugated pipe production line mainly including extruder, molding machines ... processing, and smooth internal wall, corrugated outer wall, inside and outside the hollow wall of a special pipe, ... transportation, ventilation systems, cable sheathing.PVC, PE double-wall corrugated pipe production line specifications: Φ90-Φ160, Φ200-Φ500 ...