Tamper Evident Tabbed Sealing Member Having A Foamed Polymer Layer

摘要

A pull-tab sealing member for a container providing a foamed polymer layer positioned within the sealing member for effective heat sealing to the container together with a lower laminate below a tab capable of tearing to provide a tamper evident structure below the tab.

主权项

1. A two-piece liner and tamper indicating seal for sealing to a rim of a container, the liner and seal comprising:
an upper liner portion with a liner layer having a lower surface thereof with a layer configured to be at least partially absorbed by the liner layer upon heating applied such that the liner is separable from remaining portions of the seal;
a tamper indicating tabbed seal portion having an upper surface releasably bonded to the upper liner portion and a lower surface configured for bonding to a container rim, the tamper indicating tabbed seal portion includinga lower laminate including a heat sealable layer, the lower laminate configured for heat sealing the tamper indicating tabbed seal portion to a container rim;an upper laminate at least partially bonded to the lower laminate to form a gripping tab defined within a perimeter of the lower laminate, the upper laminate including an foamed polymer layer, one or more polymer support layers bonded to the foamed polymer layer, and a bonding layer forming the at least partial bond between the upper laminate and the lower laminate;a total thickness of the upper laminate including about 50 to about 70 percent of the foamed polymer layer;a ratio of the upper laminate total thickness to a thickness of the one or more polymer support layers from about 1:0.1 to about 1:0.25 and a ratio of the upper laminate total thickness to a thickness of the bonding layer from about 1:0.15 to about 1:0.25 such that the upper laminate has a construction to provide insulation effective for bonding the heat sealable layer to a container rim and so that at least portions of the tamper indicating tabbed seal portion remain in one piece upon a removal force applied to the gripping tab; andthe lower laminate and the upper laminate have a construction effective to permit tearing of the lower laminate in response to a removal force applied to the gripping tab such that a first portion of the lower laminate is configured to remain bonded to a container rim and a second portion of the lower laminate is configured to remain bonded the upper laminate.