Filament reinforced plastic screen and apparatus for making same

Details Filament reinforced plastic screen and apparatus for making same Filament reinforced plastic screen and apparatus for making same

1981-12-24

1983-05-03

Novosad, Stephen J.

Wells

Screens

Spiral

2421183, E21B 4308

Patent

active

043818200

ABSTRACT:
Filament reinforced cylindrical plastic screens having open slots defined by their surface wires which are of substantially different widths can be produced on a single helically finned mandrel. The slot widths are varied in accordance with the amount of wire-forming material placed in the generally V-shaped grooves defined by the mandrel fins. The grooves have a double relief angle so that the lower support portions of the surface wires will be formed so as to have a slightly tapered, radially elongated cross-section and the upper portions of the wires will have their sides at a substantially greater relief angle. This relationship permits a relatively small change in the total height of the wires to have a substantial effect on the width of the top portion of the wires, and thus, on the width of the slot openings which can be formed between adjacent wires.

REFERENCES:
patent: 956080 (1910-04-01), Hall
patent: 1723311 (1929-08-01), Stine
patent: 2341783 (1944-02-01), Jens
patent: 4299283 (1981-11-01), Gryskiewicz

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