Fiber impregnation process

Details Fiber impregnation process Fiber impregnation process

1988-03-21

1991-02-19

Lawrence, Evan

Coating processes

With stretching or tensioning

Running lengths

427175, 427401, 4274344, 4274346, 87 1, B05D 118, B05D 302, B05D 312

Patent

active

049943030

ABSTRACT:
A method of producing a low cost impregnated and coated fiber useful in forming pump, valve, expansion joint, hydraulic cylinder and similar packings capable of resisting high caustic concentrations is provided. In accordance with this method a relatively low cost yarn, such as rayon, is simultaneously subjected to a spreading operation and passed through a highly alkaline colloidal tetrafluoroethylene (TFE) solution. As the yarn fibers are spread from a fiber bundle to a flat ribbon-like array of spaced parallel fibers, the fibers swell or "balloon," thus allowing the TFE to completely penetrate the interior of each fiber. A subsequent coating step insures that the exterior of each fiber is completely coated with the TFE solution. Fibers produced according to the present process are characterized by substantially lower cost than available materials, are completely caustic resistant at a pH approaching or exceeding 14, and have a long, useful service life in a variety of different environments.

REFERENCES:
patent: 3692727 (1972-09-01), Peschko
patent: 3779844 (1973-12-01), Dorsch
patent: 3968297 (1976-07-01), Sauer
patent: 4232087 (1980-11-01), Trask
patent: 4298562 (1981-11-01), Latty
patent: 4495017 (1985-01-01), Abe et al.
patent: 4559862 (1985-12-01), Case et al.
patent: 4643126 (1987-02-01), Wilkinson et al.
patent: 4689244 (1987-08-01), Lusk

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