a variety of viscose fiber having properties similar to those of cotton fibers. Polynosic fibers and ordinary viscose fibers are formed from viscose by means of wet processing. However, the actual manufacture of these two types of fiber is fundamentally different. During the preparation of polynosic fibers, the freshly formed fiber is in a gelatinous state and is composed of a xanthate of highly esterified cellulose. This makes it possible to put the fiber through a substantially higher degree of plastic elongation.
Polynosic fibers are characterized by a high degree of orientation and structural homogeneity in cross section. Moreover, they are resistant to water and alkalies, as a result of which the physical properties of the fibers undergo very little alteration upon exposure to these agents. Products made from the fibers retain their shape well and are relatively wrinkle-free. Polynosic fibers are strong and exhibit reduced stretch. Their one defect is brittleness.
Polynosic fibers are used instead of fine-fibered cotton in the manufacture of a wide assortment of fabrics. The manufacture of the fibers has been most widely developed in Japan (Tiolan and Polikot), where approximately 70,000 tons were produced in 1973. Small quantities of polynosic fibers are also manufactured in the United States (Zantrel), Great Britain (Vincel), and other countries.