Patent ID: 7824749
Filing Date: 2010-11-02
Classification: B32B,B65D,Y10T

Abstract:
1. A heat-sealable peelable multilayer laminated polymeric film comprising the following substantially coextensive elements: (a) a self-supporting polymeric film substrate having a first melting point temperature, (b) a polymeric heat-sealable peelable layer on one side of the substrate, and (c) a self-supporting polymeric heat shrinkable film having a second melting point temperature, on a side of the substrate opposite the heat-sealable peelable layer; (d) a layer of an electrically conductive material; and (e) one or two intermediate heat-sink film(s), disposed between the substrate and the shrinkable film and/or between the substrate and the heat-sealable peelable layer; wherein said shrinkable film has a degree of shrinkage in a first dimension of about 10-80% over the temperature range 55 to 100° C., and a ratio of shrinkage at 100° C. in said first dimension relative to a second, orthogonal dimension in the range of 1:1 to 10:1; wherein the shrinkable film has a degree of shrinkage in one or both of said first and second dimension(s) that is greater than the degree of shrinkage of the film substrate in said dimension(s) at substantially the same temperature; wherein the polymeric heat-sealable, peelable layer is capable of forming a heat seal bond to a receptacle surface at a temperature which is less than said first and second melting point temperatures; and wherein a difference in the degree of shrinkage in the substrate layer and the shrinkable film upon heating is selected to curl said film away from said receptacle bonded thereto generating a peeling force sufficient to overcome said bond between the heat sealable layer and at least part of said receptacle surface.