| abstract |
An improved container seal (10) comprises a flexible sealant sheet (12) and a flexible tab sheet (14) bonded thereto. The sealant sheet and tab sheet are of the same size and shape. The sealant sheet has a sealing surface and a first thermoplastic surface (22), and the tab sheet has an outer surface and a second thermoplastic surface (24). The first and second thermoplastic surfaces are in opposed, congruent contact with each other, and a portion of the first thermoplastic surface is ultrasonically welded to an opposed portion of the second thermoplastic surface. The ultrasonically welded portions (16, 18) of the thermoplastic surfaces are positioned on the sealant sheet and tab sheet in a manner that allows at least one edge portion of the tab sheet to be lifted away from the sealant sheet, providing a tab member (20) for removing the seal from a container. |