Process for the production of polyolefin fibers

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

D - Textiles, Paper

01

F

18/500

D01F 6/04 (2006.01) D01D 5/40 (2006.01)

Patent

CA 1072278

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 tempera- ture of the composition being within the range of critical temp- eratures 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. The critical velocity and the lower critical temperature are determined by the appearance of 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).

219069

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