Zinc-free preparation of rayon fibers
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United States of America Patent
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Sep 6, 1983
Grant Date -
N/A
app pub date -
Jul 13, 1981
filing date -
Jul 13, 1981
priority date (Note) -
Expired
status (Latency Note)
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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.
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