BALANCED AND LOW HEAT SHRINKAGE SEQUENTIALLY BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE FILM AND PROCESS FOR PRODUCING THE SAME
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United States of America Patent
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Jul 3, 2014
app pub date -
Dec 31, 2013
filing date -
Dec 31, 2012
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Described are methods for producing a sequentially biaxially oriented thermoplastic film having balanced machine direction (MD) and transverse direction (TD) heat shrinkage properties. The methods can include extruding a film, orienting the extruded film in a machine direction, quenching the film, heating the film in an transverse orientation oven and transversely orienting the film, and allowing the film to relax in the machine direction at a machine direction tension lower than a machine direction tension of the film in the transverse orientation oven.
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