| 摘要 |
PURPOSE: A polygonal duct having a fiber coating layer for a multi-composite structure is provided to obtain strong adhesion of the fiber coating layer by forming a core layer out of resin on a molded pipe and coating the fiber coating layer on the outer surface of the core layer. CONSTITUTION: A polygonal duct comprises an inner peripheral member(20), a core layer, and a fiber coating layer(110). In the inner peripheral member, reinforcing projections are formed at regular intervals on the upper side of an inner peripheral part(21) and a sealing protrusion is formed on the right end of the inner peripheral part. The core layer is formed between first resin(31) and second resin(41) coated on the exterior of the inner peripheral member. The fiber coating layer is spirally provided on the outer surface of the second resin.
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