| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic cap with an inner seal ring wherein strong tightening torque is not needed when the cap is to be screwed with a neck of a bottle to be mounted, a consumer can open the cap with relatively weak opening torque when using, in addition the sealability with the bottle is good and the cap is easy to mount. SOLUTION: The plastic cap comprises the inner seal ring 130 in close contact with an upper inner peripheral surface of the bottle neck hanging on a top plate 110 and a thread part 121 to be screwed with a thread part of the bottle neck on an inner peripheral surface of a peripheral wall 120 wherein the cap is screwed with the bottle neck to be mounted. A plurality of recessed parts 131 are radially provided at equal intervals on an outer peripheral surface at a lower tip of the inner seal ring 130. |
