B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/140
B32B 27/08 (2006.01) B32B 27/32 (2006.01) C08L 23/08 (2006.01) C09J 123/08 (2006.01) G02B 6/44 (2006.01)
Patent
CA 1199567
LINEAR POLYETHYLENE SHRINK FILMS ABSTRACT OF THE INVENTION A multi-layered thermoplastic film having improved physical characteristics is formulated through utilization of a linear low density polyethylene or linear medium density polyethylene resin as a core and/or an intermediate layer constituent. FIELD OF THE INVENTION This invention relates to heat shrinkable, thermoplastic pack- aging films. In particular, the present invention is directed to shrink films utilizing linear low density polyethylene or linear medium density polyethylene resins as a constituent of a core and/or an intermediate layer in a multi-layer film. BACKGROUND OF THE INVENTION The present invention is directed to new and useful heat shrink- able film formulations. One distinguishing feature of a shrink film is the film's ability, upon exposure to a certain temperature, to shrink or, if restrained from shrinking, to generate shrink tension within the film. The manufacture of shrink films, as is well known in the art, may be generally accomplished by extrusion of the resinous materials which have been heated to their flow or melting point from an extrusion die in tubular or planar form. After a post extrusion quenching to cool, the extrudate is then reheated to its orientation temperature range. The orientation temperature range for a given film will vary with the different resinous polymers and blends thereof which comprise the film. However, the orientation temperature range may generally be stated to be above room temperature and below the melting point of the film.
419695
Cryovac Inc.
Smart & Biggar
LandOfFree
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