| 摘要 |
PROBLEM TO BE SOLVED: To provide a double container gas charge preventing ring cap for preventing an inner layer body from bulging even when fed with a gas, and a double container having the ring cap.SOLUTION: A ring cap 1 includes a stationary ring portion 2 to be fitted on a mouth cylinder portion 12a of a laminated blow bottle 10 having a shrinkable inner layer body 11 and an outer layer body 12. An outer groove 3 for causing an air pipe P, when fitted, to communicate with the environment is formed in the outer circumference of the ring portion 2, whereas an inner groove 4 for causing the pipe P to communicate with the environment when the pipe P is fitted is formed in the inner circumference of the ring portion 2. In order to retain the outer groove 3 and the inner groove 4, a narrow cylindrical body portion 6 is raised from the upper face of the ring portion 2, and a through hole 7 is formed. On the outer circumference of the cylindrical body portion 6, there are formed outer projections 8 for contacting with the end face of the pipe P, when the pipe P is fitted, to retain the through hole 7 thereby to cause the pipe P to communicate with the environment. |
