| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a flexible tube to acquire the even flexibility of the flexible tube. SOLUTION: A helical tube-like flex 31 is wound around a heat-resisting bar-like core member 30 with flexibility and expandability instead of a core bar. Then the outer periphery surface of the flex 31 is covered with a brade 32, and the outer periphery surface of the blade is covered with an outer cover 35 to form this flexible tube 51. After that, the core member 30 is stretched so that the outer diameter is smaller than the inner diameter of the flex 31, and the core member is pulled out of the flexible tube 51 consisting of the flex 31, the blade 32 and the outer cover 35.
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