The major disadvantage of cellulose-based fibre production systems has been the pollution associated with the process. Solvent-spun lyocell fibre production based on the solvent N-methyl morpholine-n-oxide (NMMO) which is recovered and recycled during the process is said to be environmentally friendly. The spinning solution comprises crushed wood pulp added to an aqueous NMMO solution. Akzo Nobel Fibres who developed the NewCell process is currently researching ways of producing lyocell filament yarns, while Lenzing and Courtaulds who both have a license from Akzo Nobel are continuing lyocell staple fibre production. Tencel, Courtaulds' version of lyocell staple is, according to the company, stronger than other cellulosic fibres, easy to blend and to process into yarns and fabrics, easy to dye, dimensionally stable in washing and drying and comfortable to wear.
Lennox-Kerr P., Tech. Text. Int., vol. 3, no. 10, Dec. 94-Jan. 1995, pp 18-23