| 摘要 |
PURPOSE: A method for manufacturing a corrugated pipe is provided to allow the corrugated pipe to endure against suction pressure applied thereto by forming an inner portion of the corrugated pipe with soft synthetic resin and an outer portion of the corrugated pipe with hardened synthetic resin. CONSTITUTION: Soft synthetic resin is extruded through a first dice in such a manner that soft synthetic resin has a strip shape with a center portion which is slightly convex. Ends of the strip-shaped soft synthetic resin are bonded to each other so that a corrugated pipe is formed with a triple bonding section. A reinforcement core(3) made of hardened synthetic resin is extruded through a second dice such that the reinforcement core(3) has a spiral shape. Then, the reinforcement core(3) is cooled by means of a cooler so that the reinforcement core(3) is integrally formed with soft synthetic resin.
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