PROCESS FOR THE CONTINUOUS PRODUCTION OF VISCOSE RAYON YARNS HAVING HIGH DEGREE OF WHITE

Continuous prodn. of viscose rayon yarns comprises extruding viscose soln. into a coagulating bath, drawing and coagulating the filaments in the bath, and then finish-trea-ting the filaments while they mive in an almost helical path. The improvement comprises further coagulating the filaments after...

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Hauptverfasser:	LEONCINT NOVELLO, PAOLETTI UGO, PALLESI BICE, ANGELINT GIANFRANCO
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING TEXTILES
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Beschreibung
Zusammenfassung:	Continuous prodn. of viscose rayon yarns comprises extruding viscose soln. into a coagulating bath, drawing and coagulating the filaments in the bath, and then finish-trea-ting the filaments while they mive in an almost helical path. The improvement comprises further coagulating the filaments after they are withdrawn from the first coagulating bath, until a coagulation index of not higher than 1 is reached. These obtd. filaments are treated with water having a Ph of 4.0-5.5, a Ca(2+) ion content of not higher than 1.0mg/l. The treatment is continued until the final yarn contains (max.values) 0.2% total sulfur, 40 ppm iron, 700 ppm Zinc, and 30 ppm lead.