| 摘要 |
A closure member comprises a rim portion defining an aperture and a blocking portion which closes the aperture but can be broken free from the run portion, the portions having a zone of intimate contact therebetween produced in a moulding process (e.g. a two shot moulding process) to provide a hermetic seal between the portions. The two portions are also be coupled together at the zone of contact in such a way that the blocking portion is only removable upon application of a predetermined load thereto.
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