Method and apparatus for making helical plastic members, and the

Details Method and apparatus for making helical plastic members, and the Method and apparatus for making helical plastic members, and the

1979-05-09

1981-08-25

Thurlow, Jeffrey R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642102, 264281, 264285, 425 71, 425319, 425377, B29C 1702

Patent

active

042858992

ABSTRACT:
Helical plastic members are formed by rotating an extrusion die while extruding a filament in a generally horizontal direction just above a tank of liquid. The plastic helix so formed is cooled and solidified in the liquid. A mandrel in the liquid can be used to guide the helix downwardly, and the helix is removed from the tank with extraction rollers. As a variation, the tank can rotate relative to a fixed extrusion nozzle which extrudes the plastic horizontally just above the rotating liquid in the tank.

REFERENCES:
patent: 1190134 (1916-07-01), Embrey
patent: 1824482 (1931-09-01), Hartmann
patent: 2728104 (1955-12-01), Fisch
patent: 3090998 (1963-05-01), Heisterkamp et al.
patent: 3411182 (1968-11-01), Nevin
patent: 3450806 (1969-06-01), Matsuo
patent: 3461499 (1969-08-01), Nevin
patent: 4120929 (1978-10-01), Reum

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