| 摘要 |
PROBLEM TO BE SOLVED: To provide a liner a gas cylinder lightweight and excellent in safety. SOLUTION: Mirror parts 7 are integrally formed on both ends of a cylindrical barrel part 5a formed by flow foaming. At least one for the mirror parts 7 is formed by closing molding, and the mirror parts 7 are made to be thicker than the barrel part 5a. A hole 10 for mounting a mouthpiece is formed on a closure part 8 formed on a central part of the mirror part 7, and the whole is made of aluminum alloy.
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