| 摘要 |
A snap-off closure for a container in disclosed. The closure is injection moulded from plastics material and comprises (a) a body 61 that has a top wall 5 that has a central opening 7 and (b) a cap 9 that closes the opening 7 when the closure in an operative position on the container. The closure also comprises a region of reduced wall thickness 11 that defines a fracture line that facilitates separation of the cap from the closure. The cap 9 has two diametrically opposed inwardly projecting tabs 23 that cause a greater amount of post-moulding shrinkage than the adjacent parts of the cap after injection moulding of the closure. Consequently, the tabs 23 place a section of the region of reduced wall thickness that is close to the tabs 23 in tension whereby this section preferentially fractures when a person applies force to separate the cap from the closure.
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