Importance

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Abstract

A sealing member for a container comprises a heat actuated sealant or adhesive layer for securing the sealing member to a container, a metal foil layer over and covering and adhesively bonded to the heat actuated sealant or adhesive layer, and a polyethylene or polypropylene foam or film layer over and covering and adhesively bonded to the foil layer. In addition, a first PET tab defining layer lies over and covers at least a portion of, but is not adhesively bonded to at least part of that portion of, the polyethylene or polypropylene foam or film layer. Also a polypropylene film layer lies over and covers and is adhesively bonded to both the portion of the polyethylene or polypropylene foam or film layer not covered by the first PET tab defining layer and also to the first PET tab defining layer itself, the bonds being established by an adhesive resin and catalyst chosen to provide a high bonding strength sufficient to hold against a manually generated force. A second PET layer lies over and covers and adhesively bonds to the polypropylene film layer. The first PET tab defining layer and the portions of the propylene film and second PET layers immediately above and adhesively bonded to the first PET tab defining layer serve as a tab to facilitate removal of the sealing member from a container to which it has been adhered.

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First Claim