Abstract: A seal and method of manufacture is provided for sealing containers such as bottles, jars and the like. The seal (i.e., closure) is formed with a lower sheet-like structure having a non-foam, heat-distributing layer thereon. The lower structure includes a foil support layer and has a polymer layer, such as a PET layer disposed on its bottom surface. A heat-activated sealant layer is provided under the bottom surface of the PET layer to bond the seal to a container opening. The non-foam, heat-distributing layer is preferably a polyolefin film. Seals in accordance with preferred embodiments of the invention also include a top portion, which is only partially bonded (directly or indirectly) to the bottom portion, so as to leave a tab portion extending from the seal. The top portion is advantageously bonded from periphery to periphery of the bottom portion and at or slightly offset from the diameter (middle) of the bottom portion.

Abstract: Method of manufacture of a vessel closing assembly for adhesion into a screw cap in which a liner laminate comprising a substrate layer and a layer of stiff film on at least one side of the substrate layer, having an attachment surface for attachment to the seal laminate, is attached to a seal laminate comprising induction heat sealable layers for sealing at one side to a container and comprises at least one stiff film layer and an attachment surface at the other side whereby the attachment surface of the seal laminate faces the side of the liner laminate formed by the stiff film, the joining involving the steps of: providing a release surface on one of the attachment surfaces; applying a pressure sensitive adhesive composition, from a liquid composition to one of the attachment surfaces and drying the composition to leave an adhesive coating; and contacting the attachment surfaces to adhere the liner laminate to the seal laminate.