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Process of Viscose Rayon Fibre

In the manufacture of rayon,  the first stage is to convert pulp into alkli cellulose, for this high purity pulp sheets and caustic soda lye are fed into a slurry mixer tank titled with and agitator to form pulp slurry. The slurry press where excess slurry caustic soda lye is squeezed out to produce a blanket of alkali cellulose. It is then passed through a shedder to from alkali-cellulose crumbs.

Alkali cellulose crumbs are fed to an ageing drum where time and temperature is controlled for obtaining required degradation of cellulose so as to from shorter molecules by oxidation of the longer chain cellulose.

After ageing the alkali cellulose is treated with carbondisulphide to convert into cellulose xanthate.

Cellulose xanthate is dissolved in dilute caustic soda and the viscose obtained is then filtered, deaerated and allowed to ripen.

The ripened and filtered viscose is pumped under pressure through precious metal spinnerttes submerged in a bath composed by Sulphuric Acid, Sodium Sulphate and Xinc Sulphate. from each hole in the spinnerette or regenerated cellulose.

In the extrusion spinning machine there are a number of spinnerettes with large number of holes  through which the filaments emerge which are collected together and cut into desired staple length.

The cut fibre is then desulphurised, bleached and finished on an Aftertreatment machine. The fibre so purified is dried and baled.