Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1991-02-21
1993-09-21
Robinson, Ellis P.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 369, 428421, 428422, 604280, 138118, A61M 2500, B29D 2322, F16L 1106
Patent
active
052467520
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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Nold Charles R.
Robinson Ellis P.
Technicon Instruments Corporation
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