Multi-Tube Extrusion Apparatus and Method
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United States of America Patent
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Issued Date -
Jan 14, 2010
app pub date -
Jul 13, 2009
filing date -
Jul 14, 2008
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Abandoned
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Abstract
A method and apparatus for producing a plurality of bi-oriented, heat-shrinkable thermoplastic tubular films is disclosed. Thermoplastic resin is extruded through a plurality of annular dies to form a plurality of molten plastic tubes. The tubes are cooled and solidified and sent through a plurality of pinch rollers to stretch the tubes simultaneously in a machine and transverse direction, creating a plurality of tubular films. The films are cooled and heated, and then relaxed simultaneously in a machine and transverse direction. Winding rollers then wind up the finished tubular films.
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