Regenerated Cellulose Fibres by C Woodings

By C Woodings

This can be a complete paintings by way of commercial and educational experts at the chemistry, physics, strategy expertise, purposes and markets for man-made cellulosic fibers. It covers the homes and functions of viscose rayon, cupprammonium rayon and solvent-spun fibers in addition to contemplating their relationships with the typical cellulosics corresponding to cotton and the substitute polymer fibers akin to polyester. Published in organization with The cloth Institute.

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Unreacted cellulose following xanthation will cause potentially extreme filtration problems, and may necessitate discarding of the viscose. Some plants employ a forced cooling system for alkcell, in which a semifluidised bed of alkcell is passed continuously through a temperature and humidity controlled atmosphere. Other processes rely on the alkcell transportation to cool the alkcell. Metal detectors are often employed to screen out extraneous metallic objects from the alkcell prior to addition to the churns.

J Gullichsen, Jyväskylä, The Finnish Paper Engineers’ Association and TAPPI, 1998, (Book I), pp 102–124. 24 B Lönnberg, ‘The effect of water transport of wood on wood quality’, Seminar on Water Transport of Wood, Finland, National Board of Vocational Education, 1983, pp 223–226. 25 R Patt, M Zimmermann, O Kordsachia and J F Hinck, ‘Optimization of the prehydrolysis and pulping steps in ASAM dissolving pulp production’, Pulping Conference, Tappi Press, San Diego, CA, 1994, Book 1, pp 141–46. 26 U Neumann, O Kordsachia and R Patt, ‘Aufschluss von Kiefernholz im Natronlauge/AQ/Methanol-System’, Das Papier, 1997 51(11) 573–579.

The main feature of the multistage processes was to alternate between more or less acidic bisulphite/sulphite and alkaline 24 Regenerated cellulose fibres stages. A process could start or end with the alkaline stage, which latter alternative led to a kind of alkaline extraction to diminish the residual hemicelluloses. 1 Introduction The pulping process has to dissolve the main bulk of the lignin and modify the residual lignin for successful bleaching. Bleaching then has to remove this residual and increase the pulp brightness and cleanliness.

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