| 摘要 |
PROBLEM TO BE SOLVED: To form one winding core capable of preventing occurrence of winding wrinkle in it in at least one pipe when forming it by combining a plurality of pipes having different diameter. SOLUTION: A plurality of projecting bars 7A, 7B are formed on at least one face among an outer peripheral face and an inner peripheral face. The plurality of projecting bars 7A, 7B are arranged at positions equally distanced in the direction of whole periphery to prevent deviation of a central axis and prevent occurrence of winding wrinkle in the winding core. COPYRIGHT: (C)2006,JPO&NCIPI
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