Induction-sealed composite container end closure

摘要

A closure for sealing an opening of a tubular container is disclosed, the closure having a paperboard central panel with a plurality of secondary panels extending angularly therefrom forming a surface around the perimeter of the central panel. A plastic skirt is adhered around the perimeter of the central panel and to one side of the secondary panels opposite the surface to reinforce it. A metal foil layer is adhered to the surface, the foil having a side facing the sidewall of the container with a heat-activated adhesive layer thereon. The closure is positioned on the container with the central panel in registration with the opening and the heat-activated adhesive layer engaging the sidewall of the container. The seal between the closure and the container is effected by subjecting the container to an electromagnetic induction field, whereby eddy currents induced in the metal foil by the field cause the heat-activated adhesive to form a bond between the container sidewall and the secondary panels.