VENTED COMPOSITE CLOSURE

摘要

A composite closure (12) for a container (11) has an outer band (14) with a partial toroidal hook (16) that overhangs a crown (40) around the periphery of an insert cover disk (17). As the closure (12) is tightened on the container (11), the hook (16) bears downwardly on the crown (40) of the disk (17) and urges the disk (17) against the container rim. The hook (16) has several vents (53) formed on its underside to enable air communication. A lower, inner edge (39) of the hook (16) is spaced apart from the disk (17) to provide communication with the vents (53) from the environment. An annular recess (55) is formed on the underside of the hook (16), and is in communication with the vents (53) and with a gap (48b) formed between an outboard wall of the crown (40) and an inboard sidewall of the hook (16). A retaning bead (26) is formed on a skirt (30) below the hook (16) to retain the disk (17). The bead (26) is spaced apart from the disk (17) when the closure is assembled to a container to enable communication from the environment through the vents (53) to the threads (26).