Method for the manufacture of thin tubes of fluorinated resin, particularly of polytetrafluoroethylene
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United States of America Patent
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-
May 4, 1993
Grant Date -
N/A
app pub date -
May 29, 1991
filing date -
May 30, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A process for the manufacture of a thin-walled tube of fluorinated resin, particularly polytetrafluoroethylene, in which a ribbon of fluorinated resin obtained by lubricated extrusion and calendaring, is wound into a tube on a mandrel, the winding of the ribbon being performed in a plurality of layers, and the thus-wound ribbon on the mandrel being brought to a temperature above the sintering temperature of the fluorinated resin for sufficient time to produce sintering. The wound tube and the mandrel are cooled; while on the mandrel the thin-walled tube is rolled to elongate the tube, to reduce the thickness of the tube, and to increase the inside diameter of the tube; and then the mandrel within the tube is extracted.
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