Product and process for stretching a tubularly formed sheet of orientable thermoplastic material
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United States of America Patent
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Feb 17, 1981
Issued Date -
N/A
app pub date -
May 1, 1978
filing date -
May 1, 1978
priority date (Note) -
Expired
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Abstract
There is described a process for bi-axially stretching a tubularly-formed sheet of thermoplastic material in first and second stations wherein the first and second stations are provided with sets of rolls having generally sinosoidally-shaped grooves perpendicular and parallel, respectively, to the axis of each set of rolls to produce bags of improved strip tensile breaking strength.
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