As with viscose, the Tencel process involves wood as the raw material. The cellulose contained in it is extracted and the dissolving wood pulp obtained in this way is finely dispersed in a concentrated aqueous solution of N-Methylmorpholine N-oxide (NMMO) and dissolved. The excess water is evaporated to form a solution of cellulose.
The highly-viscous solution is filtered and then pressed through spinnerets into an aqueous spinning bath. There, the cellulose precipitates in the form of fibers. Further auxiliary materials, dulling agents and stabilizers are needed for this process.
Finishing agents are applied to the fibers to improve their running and gliding properties for further processing. The finishing agents used are fully biodegradable.