Zinc-free preparation of rayon fibers

Details Zinc-free preparation of rayon fibers Zinc-free preparation of rayon fibers

1981-07-13

1983-09-06

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264197, D01F 206

Patent

active

044028997

ABSTRACT:
Rayon fibers having a C-shaped cross section and characterized by low caustic solubility are prepared from an unmodified viscose spinning solution having a salt index below 14 by spinning the viscose solution into a zinc-free coagulation bath containing at least 100 g/l of Na.sub.2 SO.sub.4, at least 175 g/l of (NH.sub.4).sub.2 SO.sub.4 and more than 100 g/l of H.sub.2 SO.sub.4 while the bath is at a temperature above 40.degree. C. The coagulated filament is then stretched in a secondary bath maintained at a temperature over 70.degree. C.

REFERENCES:
patent: 1930803 (1933-10-01), Harrison
patent: 2997365 (1961-08-01), Smith et al.
patent: 3097914 (1963-07-01), Lewis
patent: 3720743 (1973-03-01), Stevens et al.
patent: 4242405 (1980-12-01), Bockno

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