Viscose: Difference between revisions
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Revision as of 16:30, 26 April 2006
Viscose is a viscous organic liquid used to make rayon and cellophane. Cellulose from wood or cotton fibres is treated with sodium hydroxide, then mixed with carbon disulfide to form cellulose xanthate, which is dissolved in more sodium hydroxide. The resulting viscose is extruded into an acid bath either through a slit to make cellophane, or through a spinneret to make viscose rayon (sometimes simply called viscose). The acid converts the viscose back into cellulose.
The process for manufacturing viscose was discovered by three British scientists, Charles Cross, Edward Bevan and Clayton Beadle, in 1891.
Industrial Applications
Viscose was first used for coating fabrics which it did quite successfully. However, when Cross and his partners tried to make solid objects like umbrella handles they were found to be much too brittle.
Further development led to Viscose being spun into thread for embroidery and trimmings. Eventually, after Samuel Courtauld & Co. had taken over in 1904, Viscose manufacture became big business. By the twenties and thirties it had almost completely replaced the traditional cotton and wool for women’s stockings and underwear. Similar changes occurred in the US and in Europe, too. Viscose was also being used for linings and furnishing fabrics; providing the staple for towels and table-cloths and was being made into high tenacity yarn for tyres. Yet other uses included the manufacture of sponges and absorbent cloths.
Making Viscose film had been tried by Cross in the 1890s but it was in Switzerland and France that major successes were achieved. By 1913 C.T.A. established La Cellophane SA. Ten years later DuPont Cellophane Co. was set up in the USA and in 1935 British Cellophane Ltd was established in Bridgwater, Somerset.
Viscose is becoming less common because of the polluting effects of carbon disulfide and other by-products of the process, and resultantly the Bridgwater factory closed in 2005.