| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin-made cap capable of avoiding a release failure, cost increase, and also enhancing sealing performance.SOLUTION: A synthetic resin cap includes a top wall 5 and a skirt wall 6 suspended from the outer peripheral part of the top wall 5, and it is screwed to a container mouth part. An annular middle leg 7 in tight contact with the inner peripheral surface of the container mouth part is provided continuously from the inner surface of the top wall 5, and the middle leg 7 is configured such that the outside diameter thereof becomes the largest at the center part 10, and also, a swelling part 13 swelling inwardly is formed on the upper part 11 of the middle leg 7, and regarding the portion upper than the swelling part 13 of the middle leg 7, the thickness becomes larger as it comes close to the upper side. |
