Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1994-03-10
1996-04-09
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
2642092, 2642098, 264312, 264323, 425144, 4253781, 425381, 425467, B29C 4724, B29C 4786
Patent
active
055058876
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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Kalin Gerald
Lentz David J.
Popadiuk Nicholas
Zdrahala Richard J.
Meadox Medicals Inc.
Thurlow Jeffery R.
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