Using polyethylene as the main material, this production line produces heavy-caliber double-wall ripple pipes. Because of its characteristics of light weight, strong impact resistance, high ring-stiffness and high corrosion resistance, it is widely used for many fields, such as electric cable sheath underground pipe, city water-drain pipe and up-down water transporting in construction etc. After being processed precisely, the molding machines, handpieces and modules have high accuracy, so they can guarantee every performance criterion of formed pipes. The ring-type double knives of the slitter ensure high cutting accuracy, and they make the fracture surface vertical and plane.