Tubular materials
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United States of America Patent
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Sep 9, 1997
Issued Date -
N/A
app pub date -
Aug 24, 1994
filing date -
Nov 30, 1988
priority date (Note) -
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Abstract
Tubular workpieces of oriented polymers such as polyethylene polyester and PVC are formed by drawing a workpiece over an expanding former in the absence of any force perpendicular to the axis of the workpiece. The processes do not require the use of any liquid lubricant. They enable greater degrees of expansion and hence orientation in the direction perpendicular to the axis to be achieved and result in products of improved appearance and strength.
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