Patent ID: 6267837
Filing Date: 2001-07-31
Classification: B32B,B65D,G06Q,Y10S,Y10T

Abstract:
A method of forming an insulating container comprising the steps of:providing a paperboard base layer having an inside surface and an outside surface;applying an impervious coating on at least a portion of one of said inside surface and said outside surface of said base layer;forming an insulating region by selectively adhering a polymer film to said inside surface of said paperboard base layer thereby forming a plurality of enclosed expandable regions adjacent said inside surface of said paperboard base layer; andforming said base layer having said impervious layer and said polymer film thereon into a container having at least one side wall and a bottom wall;wherein said inside surface of said base layer forms an inside surface of said container and said polymer film expands in response to an expansion of air trapped in said enclosed regions in response to contact with a hot liquid.