VACUUM CLOSURES AND CONTAINERS THEREFOR, AND COMBINATIONS THEREOF

摘要

A vacuum closure comprises a metal panel (32), typically surrounded by a moulded plastics band (34), the panel having a concave depression (50) with a vacuum release hole (56) located therein. A plug of plastisol material (60) is deposited into the depression so as to form a removable seal for the hole (56). The hole is formed with an upturned annular side wall to form a convergent chimney (58), and the plug is chosen so as to be adherent to the lacquer coating on the underside of the metal panel, but non-adherent to the lacquer coating on the top of the metal panel. The plastisol plug (60) can therefore be removed to release the vacuum within the container via the hole (56), thereby facilitating release of the closure.