Inner seal with a sub tab layer

摘要

A pull-tab sealing member for a container containing an upper laminate forming a pull-tab bonded to a lower laminate capable of being heat sealed to a container's mouth or opening. The upper laminate defines the pull tab wholly within a perimeter or circumference of the seal. The sealing member further includes a sub tab layer or member under the gripping tab for structural support.

主权项

1. A concentrically stable tabbed sealing member for sealing to a rim surrounding a container opening, the sealing member formed out of a multi-layer laminate sheet comprising:
a lower laminate portion including a heat seal layer for bonding to the container rim, a metal foil layer above the heat seal layer for heating the heat seal layer, a polymer foam layer above the metal foil layer, and at least one non-foam polyolefin film support layer above the polymer foam layer; an upper laminate portion including one or more layers and partially bonded to the lower laminate portion and including a free portion not bonded to the at least one non-foam polyolefin film support layer; a tab stock polymer layer extending partway across the concentrically stable tabbed sealing member, the tab stock polymer layer bonded to one of the layers in the upper laminate portion and not bonded to the lower laminate portion, wherein the free portion and the tab stock polymer layer form a gripping tab defined wholly within a perimeter of the sealing member, the gripping tab for removing the sealing member from a container opening; and the at least one non-foam polyolefin film support layer coextensive with at least the gripping tab at a periphery thereof to provide structural support and stabilize the lower laminate portion below the gripping tab of the sealing member.