| 摘要 |
A screw for a plastic canister cap has a through airhole that opens into an annular channel in the base of the cap. The end positions of an external thread on the pouring nozzle and an internal thread on an annular wall of the screw cap are matched to one another and at least two through airholes are provided in the annular channel so that one of the airholes is always at least in the vicinity of the through hole of the pouring nozzle. |
