... extruding 2. good die head, mould block, cutting machine 3.CE ISO9000 HDPE double wall corrugated pipe production line The corruated pipe production line ... is specially designed for extrude HDPE, LDPE, and PP material, grooved barrel, equipped with the lower noise fan, ... handling, special designed mouth molds, suitable for different material and different ring stiffness pipe produce. The special molds ...