| 摘要 |
PROBLEM TO BE SOLVED: To easily pull out a stopper and to improve sealing performance without spoiling such an advantage that can prevent the stopper from being buckled and deformed when it is hitted in. SOLUTION: A number of reinforcing ribs 8 extending in the up and down direction on the inner peripheral face of a stopper part 3 of a stopper body 2 are formed. A tapered thin ring-like piece 9 extending downward is provided on the top end part of the outer peripheral face of the stopper part 3. When the stopper is hitted in, the ring piece 9 is bent and deformed and be pinched between the top end part of a bottle mouth A and an underside 4a of a flange and as the ring piece 9 is tightly bonded on the mouth A of the bottle, sealing performance can be improved. |
