Method for manufacturing biaxially oriented tubing from thermoplastic material
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United States of America Patent
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Aug 24, 1999
Grant Date -
N/A
app pub date -
Jan 15, 1997
filing date -
May 4, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tube is extruded from a thermoplastic material and is then forced over a mandrel at an orientation temperature of the material. The mandrel has an expanding section that expands the tube in its circumferential direction. A tube speed controller upstream of the expanding section of the mandrel exerts an axial force on the tube, and a puller downstream of the mandrel exerts an axial pulling force on the tube. Upstream of the tube speed controller, an outer layer of a wall of the tube is brought to a temperature below the orientation temperature. That outer layer is thick enough to withstand the force exerted by the tube speed controller.
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