Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1987-12-23
1989-08-15
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
264 16, 264 27, 264 402, 264127, 264233, 2642356, 264237, 2642896, 264291, 264337, 425140, 425392, 425461, B29C 5530, B29C 5522
Patent
active
048572470
ABSTRACT:
The specification discloses a new method and apparatus for treating extruded TEFLON (fluoropolymer) tubing to significantly improve its dimensional and optical characteristics. Diameter tolerance is .+-.0.0002, concentricity rises to 95%, and optical clarity rises to the theoretical transmittance of the material. The tubing is first cleaned, and then heated to a transition temperature above 150.degree. C. to soften and further homogenize the tubing. The tubing is then drawn through a polished diamond die and then rapidly cooled. The cooled tubing may be further stabilized by an annealing step. Both a batch mode and a continuous mode of operation are disclosed.
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Lowe James
Technicon Instruments Corporation
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