Process for the production of polyolefin fibers

Details Process for the production of polyolefin fibers Process for the production of polyolefin fibers

1976-07-23

1978-01-17

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

162157R, 264 13, 264204, 528502, D21F 1100

Patent

active

040692876

ABSTRACT:
A process and apparatus for manufacturing polyolefin fibers from a composition of the said polyolefins dissolved in a diluent, by subjecting the composition to flow at a velocity above a critical value in a tube or bundle of tubes, the temperature of the composition being within the range of critical temperatures of the said composition over at least a portion of the length of the tube or bundle of tubes and separating the fibers from the liquid diluent. The critical temperature range is below the temperature of solution of the polyolefin in the molten state in a diluent and is more specifically the range of temperatures in which the polyolefin remains in dissolved condition when the solution mixture is maintained at rest but precipitates when the mixture is subjected to certain disturbances such as, for instance, shearing. This typically is between 70.degree. and 130.degree. C. The lower limits of the critical velocity and the critical temperature are determined by the appearance of undesired powder co-precipitating with the fibers.
In a variation the composition contains fibrous material (e.g. cellulose) insoluble in the diluent, yielding an interlaced fiber mix (useful in paper making, among other things).
In a further improvement to avoid formation of "nodules" (i.e. random agglomerations of fibers), said tube(s) is provided with at least one restriction decreasing the cross-section of the tube(s); e.g. by a diaphragm, conical nozzle, very short inner tube, etc.

REFERENCES:
patent: 3549732 (1970-12-01), Rice
patent: 3719648 (1973-03-01), Frielink
patent: 3902957 (1975-09-01), Kotlowski

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