Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating... – Continuously formed or indefinite length article
Patent
1973-01-02
1976-03-16
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
Continuously formed or indefinite length article
264145, 264150, 264167, 264173, 425381, 425465, 425466, B29D 2304
Patent
active
039446417
ABSTRACT:
An apparatus and method are provided for forming tubing and pipe with the inside surface of the pipe wall shaped irregularly for the purpose of either reducing boundary layer drag of a fluid flowing through the pipe or for anchoring a protective lining within the pipe. The apparatus includes an extruder having a die and a mandrel extending through the die for defining the inside surface of the extrusion. In one form, the mandrel is longitudinally oscillated to form circular serrations in the wall of the extrusion formed over the mandrel. In another form, the mandrel is rotated to provide circular or spiral serrations in the wall of the pipe. In yet another form, an electromagnetic field is generated and is varied in intensity in the vicinity of the extrusion die so as to cause variations in the dimensions of either or both the die and the mandrel located therein for varying the surface configuration or roughness of both the internal and external surfaces of the tube or pipe extruded through the die.
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Lowe James B.
White Robert F.
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