| 摘要 |
A closure (10) suitable for attachment to a container (20) having an opening defined by an end portion (40) of the container (20). The closure (10) can be molded from a synthetic plastics material and includes a top (11) and a skirt (12) depending from the top (11). An annular sealing rib (14) projects downwardly from an underside of the top (11). The rib (14) includes a first portion (15) which is contiguous with the top (11) and has an inner surface (19) which lies radially inwardly of the skirt (12), a second, frustoconical, portion (16) contiguous with the first portion (15) and extending radially inwardly, a third portion (17) connected to the second portion (16) and extending generally in a direction away from the top (11) to an end distal the top (11), and a fourth portion (18) connected to the third portion (17) at or adjacent the distal end and also extending in a direction generally away from the top (11). The fourth portion (18) has a thickness that is less than the third portion (17). The inner surface of the first portion (15) has an internal diameter relative to the external diameter of the end portion (40) of the container (20) such that during attachment of the closure (10) with the end portion (40) of the container (20), the sealing rib (14) is engaged by the end portion (40) of the container (20). This leads to folding of the second portion (16) towards at least the inner surface of the first portion (15) of the rib (14), and with the third and fourth portions of the rib positioned between the end portion (40) of the container and at least the top (11) of the closure (10).
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