| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of poor sealing on an outer ringlike seal piece in an integrally-molded plastic cap wherein the outer ringlike seal piece for sealing a container spout from the outside projects on the inner surface of a top surface wall.SOLUTION: In the integrally-molded plastic cap in which the outer ringlike seal piece 13 for sealing the container spout 50 from the outside is projecting on the inner surface of the top surface wall, having the top surface wall and a cylindrical peripheral wall hung down from the peripheral edge of the top surface wall, an upper primary zone 20 and a lower secondary zone 30 divided from the primary zone 20 with a valley-like dividing line 15 extended circumferentially are formed on the inner peripheral surface of the outer ringlike seal piece 13. The outer ringlike seal piece 13 closely adheres to the container spout 50 at the primary zone 20, and is separated from the container spout 50 at the secondary zone 30. |
