By C Woodings
It is a accomplished paintings through commercial and educational experts at the chemistry, physics, technique expertise, functions and markets for man-made cellulosic fibers. It covers the houses and functions of viscose rayon, cupprammonium rayon and solvent-spun fibers in addition to contemplating their relationships with the typical cellulosics akin to cotton and the substitute polymer fibers akin to polyester. Published in organization with The fabric Institute.
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Additional info for Regenerated Cellulose Fibres
5. Pre-ageing. The shredded alkali cellulose is stored to allow the oxygen in the air to oxidise it. This reduces the molecular size of the cellulose, which is necessary to obtain a spinning solution of the correct viscosity. 6. Xanthation. The alkali cellulose is combined with carbon disulphide (derived from carbon and sulphur) to produce sodium cellulose xanthate. 7. Dissolving. The sodium cellulose xanthate is dissolved in caustic soda to form the syrup-like spinning solution known as viscose.
To minimise the risk of explosion at venting (as air mixes with the CS2 vapour), nitrogen purging of the churns is sometimes used. Some operations employ a staged addition of mixing liquors of varying concentrations, emptying the churn between each addition to ensure a good degree of churn cleanliness for the next batch. 12 Viscose ageing Viscose dope must be aged before spinning can take place to allow for the distribution of CS2 evenly on the cellulose chains. Even distribution is vital if stable spinning and good fibre properties are to be achieved.
1). The rayon filaments are formed when the viscose solution is extruded through the very small holes of a spinneret into a spin bath consisting basically of sulphuric acid, sodium sulphate, zinc sulphate and water. The spin 37 38 Regenerated cellulose fibres 1. Viscose is made from cellulose, a constituent of all land-growing plant life. Spruce and eucalyptus yield much of the high-grade cellulose required for viscose. 2. Cellulose. In the pulp mill the bark, lignin etc, are removed from the trees and the extracted cellulose is pressed and cut into sheets.