Extrusion process for manufacturing PTFE products
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United States of America Patent
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Apr 9, 1996
Grant Date -
N/A
app pub date -
Mar 10, 1994
filing date -
Mar 10, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An improved extrusion method is employed in a process which is used to form tubing for medical applications. The method includes providing an extrusion apparatus having a die which includes a die cavity and a mandrel within the die cavity. The die is rotated in a first rotational direction while the mandrel is rotated in a second rotational direction opposite the first direction. While the die and the mandrel are rotating, a PTFE paste is passed through the annular passage defined between the die and the mandrel. The die cavity is cooled to maintain the PTFE paste passing therethrough at a substantially non-elevated temperature.
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