Regenerated cellulose.

Viscose is produced from purified wood pulp. Because of the severity of the processes used to dissolve the cellulose, the fibres tend to be weak, especially when wet, and have poor elastic recovery. Modifications to the chemical pre-treatments and the extrusion process resulted in the development of high tenacity viscoses, so called modal fibres with improved mechanical properties and more recently lyocell fibres which are claimed to be cotton-like and environmentally friendly. Other modifications develop crimp and flame retardency.

Wet spinning (viscose)