| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inexpensively manufacturing a pressure vessel having a plastic inner shell of high airtight characteristics. SOLUTION: Metal mouthpieces are embedded on both ends of a plastic cylindrical vessel. In order to integral mold such an inner shell by rotational molding, a flange outer surface 10a of the metal mouthpiece and the inner surface of a molding die 14 are in contact with each other in a liquid tight manner at a center side of the flange, and then fixed. A clearance 16 in which resin is charged is formed between the flange outer surface 10a and the inner surface of the molding die 14 with the contact portion as a front. The width of the clearance 16 is 3 mm or more at the end of the flange 10d, and gradually decreased to a front 17 of the clearance 16, showing the minimum value at the front 17. An airtight pressure vessel can inexpensively be manufactured by charging resin in the clearance 16.
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