Dies and Methods for Improving Physical Properties of Stretch Film
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United States of America Patent
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Issued Date -
Jan 23, 2014
app pub date -
Jul 17, 2013
filing date -
Jul 17, 2012
priority date (Note) -
Abandoned
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Abstract
Dies and methods of extruding stretch film are provided, wherein the die includes at least an upper die lip and a lower die lip; the upper and lower die lips at least partially define a die gap; and at least one of the die lips includes a channel. Another die disclosed includes at least a die gap; and at least one jet for directing a stream of air onto the polymer as it is extruded through the die gap. Stretch films and methods for extruding stretch films are provided, wherein selected areas of the polymer extruded through the die have a gauge that exceeds the film's base gauge. The film includes at least a layer of film having a base gauge and a plurality of strength bands running longitudinally along a length of the film; and have a gauge that is greater than the base gauge.
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