| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability of an air-tight seal, by preventing development of a crack and a clearance. SOLUTION: This pressure vessel 1 is provided with an FRP shell 2 formed by fixing a fiber 14 impregnated with a thermosetting resin, the FRP shell 2 is constituted by winding the fiber of heat resisting temperature higher than a core 6 to an external periphery of the heat melting core 6 to fix the wound fiber impregnated with a thermosetting resin heat hardened at a temperature lower than a melting temperature of the core 6. The core 6 is fused to be removed after the impregnation fixing.
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