Tamper evident tabbed sealing member having a foamed polymer layer

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 temporary bonding layer configured to permit the upper liner portion to separate from remaining portions of the seal upon heat being applied;
• 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 including
• a lower laminate including a heat sealable layer and an induction heating 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 a 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;
• and
• the 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 including the heat sealable layer and the induction heating layer is configured to remain bonded to a container rim and a second portion of the lower laminate including the heat sealable layer and the induction heating layer is configured to remain bonded the upper laminate.