COMPOSITE CLOSURE CAP

摘要

A composite plastic and metal closure cap is described for sealing containers such as glass tumblers or similar containers. The closure cap has an outer plastic ring portion which engages the container and which mounts a disc-like metal cover. The plastic ring includes lugs which snap over a bead on the container rim when the package is sealed and which are snapped off of the bead for cap removal. The cap is particularly useful for sealing vacuum containers and includes means for facilitating its removal against the vacuum force on the closure of the sealed package. In one embodiment, this means comprises a vent in the metal cap cover and an integral vent opener. In another embodiment, vacuum-breaking lift means are formed on the plastic rings.