Polytetrafluoroethylene tubing and extruder for the production thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 30, 2003
Grant Date -
N/A
app pub date -
Feb 18, 2000
filing date -
Aug 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an extruder for producing a polytetrafluoroethylene tube having a minimum thickness deviation by extruding a polytetrafluoroethylene paste through an annular portion formed by a core pin (30) and a die orifice (50) around it, the core pin comprises a mandrel connection end (34) which is connected to a mandrel and a die orifice outlet end (36) which is located at a die orifice outlet end, and the core pin has between the ends a portion of which cross-section perpendicular to an axial direction of the core pin has a smaller area than that of a cross-section of each end of the core pin. By using the extruder, the tube having a thickness deviation of not larger than 15% can be obtained.
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