Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1977-10-05
1979-01-16
Hoag, W.E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264286, 264331, 264345, B29C 1700, B29F 500
Patent
active
041349580
ABSTRACT:
The method disclosed consists of applying a plain tubular blank in polytetrafluorethylene to a cylindrical mandrel of a diameter providing for a clearance between said blank and mandrel corresponding to the depth of the corrugations to be formed. The blank is retained at its ends concentrically with the mandrel. A wire is then wound in a helical path around the blank under a tension ensuring the forming of helical corrugations, the blank being additionally retained at its outside surface within a zone preceding the zone wherein the corrugations are being formed. On forming the corrugations all the way along the surface of the blank, the product is heat treated at a temperature between 250 and 300.degree. C.
By virtue of the method disclosed, the helix of wire can now be applied to a blank of polytetrafluorethylene at a rate of rotation of the blank which is 5 to 10 times that used ever before and the time of fabricating a corrugated tube between 1 and 3 m long is now reduced by 50 to 33% as compared with the known methods. Moreover, it is now a practical possibility to cut by as much as between 67 and 80% the waste of tubing unsuitable for the purpose for which it was intended.
REFERENCES:
patent: 2430081 (1947-11-01), Roberts et al.
patent: 3327039 (1967-06-01), Ruckert et al.
Dunichev Jury F.
Dushenkov Anatoly S.
Pugachev Arkady K.
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