| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for any projection formed on the inside of a cap, which is a hindrance to the capping of a bottle mouth, to improve workability in the assemblage of it, and enable smooth, sure uncapping operation by an automaton, by providing a thin buckling part in the circumferential direction of a band, causing the buckling part to buckle inside during the rolling and fastening of the cap, and automatically locking the band onto a bottle mouth so that it cannot be pulled off. SOLUTION: A thin buckling part 5 is provided in the circumferential direction of a band 3 provided so as to continue to the lower end of a cap main body 2 via a part 4 capable of being twisted off. A cap is rolled and fastened so that the lower end of the band 3 contacts the shoulder 9 of a bottle. Consequently, during the rolling and fastening of the cap, the band 3 receives vertical force, the buckling part 5 buckles inside below the bulging part 10 of a bottle mouth 8 and the band 3 is locked on the bottle mouth 8 so that it cannot be pulled off.
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