Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1986-11-13
1988-05-10
Bueker, Richard R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428422, 623 1, 138177, 138DIG3, 2642888, D02G 300
Patent
active
047434805
ABSTRACT:
Apparatus, a method for extruding and expanding tubular products of polytetrafluoroethylene (PTFE) and the products produced thereby are provided. In the apparatus, at least one helical groove is placed in the wall of the extruder tip or die. Preferably, at least one groove is machined in the tip having a pitch angle of 45 degrees and at least one groove is machined in the die having a pitch opposite that (135 degrees) of the tip groove. In the expanded products produced according to the invention, at at least one radial position within the wall of a tube substantially all of the longitudinal axes of the nodes are oriented at an angle between about 85 degrees and about 15 degrees with respect to the longitudinal axis of the tube. In a preferred embodiment, substantially all of the longitudinal axes of the nodes located adjacent the inside wall of the tube are oriented at an angle between about 85 degrees and about 15 degrees with respect to the longitudinal axis of the tube, and substantially all of the longitudinal axes of the nodes which are located adjacent the outside wall of the tube are oriented at an angle between about 15 degrees and about 165 degrees with respect to the longitudinal axis of the tube. For the preferred product, its hoop strength is increased over an otherwise identical tube extruded using smooth surfaced, nongrooved extrusion tip and die.
REFERENCES:
patent: 3008187 (1961-11-01), Slade
patent: 3953566 (1976-04-01), Gore
patent: 4082893 (1978-04-01), Okita
patent: 4187390 (1980-02-01), Gore
patent: 4277429 (1981-07-01), Okita
patent: 4279245 (1981-07-01), Takagi et al.
patent: 4478665 (1984-10-01), Hugis
patent: 4482516 (1984-11-01), Bowman et al.
Biggerstaff Charles E.
Campbell Michael L.
Riffle Rob G.
Williams Benjamin G.
Bueker Richard R.
Seidleck James J.
W. L. Gore & Associates, Inc.
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