Method for extruding tubular film
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United States of America Patent
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Nov 20, 2001
Grant Date -
N/A
app pub date -
Aug 27, 1999
filing date -
Aug 27, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus is disclosed for lacing an extruded tube of a non derivatized cellulose through an S-wrap to collapse the tube to a flat width. The lacing to form the S-wrap is accomplished without slowing the extrusion speed. At the start of the extrusion operation, the extrusion path leads between a pair of horizontally lacing members. After the leading edge of the extruded tube has passed downwardly through the space between the lacing members, the members are rotated as a unit to bring them into contact with opposite sides of the extruded tube. This collapses the and creates the S-wrap.
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