Process for treating cellulosic materials with liquid ammonia

Details Process for treating cellulosic materials with liquid ammonia Process for treating cellulosic materials with liquid ammonia

1978-03-03

1980-07-22

Kight, III, John

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Cellulose fibers

D06B 704, D06B 708

Patent

active

042137616

ABSTRACT:
A process for treating textile materials such as yarns, fabrics or the like is taught. The specific improvement lies in impregnating the textile material with ammonia and applying to the impregnated material stresses of about 25% to 30% of the breaking load of that material for ten or more seconds; thereafter removing a first portion of ammonia to reduce the degree of impregnation to less than 75% by weight after less than 3 seconds while stresses are reduced to about 15% of the breaking load of the material; removing a second portion of the ammonia such that the degree of impregnation is less than 30% by weight after less than 60 seconds, while stresses remain approximately the same as those in the preceding step; and finally removing the balance of the impregnated ammonia while maintaining the stresses below 5% of the breaking load of the textile material, the ammonia being removed at such a rate that the degree of impregnation is less than 15% by weight after less than 300 seconds. All of the time intervals for ammonia removal are measured from the start of ammonia removal.

REFERENCES:
patent: 3406006 (1968-10-01), Lindberg et al.
patent: 3560140 (1971-02-01), Gailey
patent: 3767359 (1973-10-01), Calamari et al.
patent: 3849067 (1974-11-01), Calamari et al.

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