| 摘要 |
A container ( 1 ) is intended for filling with a hot liquid ( 21 ). The container ( 1 ) has a neck finish ( 2 ) with an opening closed off by a primary seal ( 4 ) which has an expandable side wall ( 4 a). As the liquid ( 21 ) cools, the side wall ( 4 a) is drawn into the container ( 1 ) to remove vacuum pressure created within the container ( 1 ). A permanent cap ( 25 ) can provide a secondary seal for the container and define a secondary headspace ( 24 b) between the primary and secondary seals ( 4 ) ( 25 ). In other embodiments the seal ( 4 ) can be replaced by a mechanically movable seal which may be locked in its downward position. Also the secondary seal can be provided with a port or aperture to provide access into the secondary headspace for a commodity. Also a commodity such as a tablet or pill may be provided within the secondary headspace
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