The diameter of the viscose fibers varying from 12 to 22 microns depend on the diameter of the holes on the spinnerette (the viscose fibers spinning by passing through spinnerette).
Rayon viscose is made up of natural cellulose such as woods, or cotton linters containing 87-98% alpha-cellulose. After washing the raw materials with boiling alkali and bleaching it with sodium hypochlorite, It is spinnable fibers. The only difference between viscose fiber (Rayon) and cotton and linen is that viscose fiber (Rayon) is similar to paper – a homogeneous paste produced of wood cellulose which is processed to the final product. Fabrics produced of rayon fibers have a relatively high moisture absorption (in some cases up to 50% more than cotton), great breathability, great comfortableness, and favorable dyeability. The low electric charge and good resistance to gutting (called in Persian taltal) are other desirable properties of rayons. Production Method:
All natural materials that have cellulose are good to make viscose fibers. Most of the trees’ lumbers, sugar cane, rice and wheat straws, are always used for viscose fibers production. In different stages raw materials convert to a special paste with a limited amount of impurities, and then converted to fibers after passing through the sppinerette and the coagulation bath. The recent research on the viscose fibers has improved the strength of the fibers. Unlike cotton, increased moisture content reduces durability of viscose fibers, but increases dyeability. In the standard condition, viscose fibers have 12% moisture absorption compare to 8% of cotton fibers. The viscose fibers have less elasticity than cotton fibers, which make it more wrinklable. As the smoothness of the viscose fiber surface, it is brighter than cotton fiber; however, boiling water eliminates its brightness. The viscose fiber resists up to 150 degrees Celsius, but it is still changing color in expose to the sunlight. Similar to cotton, acids cause viscose degradation, but it shows great resistance to alkalis. The length of the viscose fiber is shorter and weaker than cotton. The viscose thermal properties are similar to cotton, yet less than cotton fibers with good ironing properties. Since synthetic fibers do not show wrinkles, waves and folding, they must be modified by chemical and mechanical methods to resemble more natural.
Application of Viscose Fiber: it is used for clothing includes: Blouse, Shirts, women’s clothing, linings, underwears; industrial textiles; non-woven textiles; and synthetic chamois leather; Home Usage such as: Roofing, Pillowcase, Sheets and Handbags.
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