Lyocellfibrer

Lyocellfibrer are regenerated cellulose fibers obtained by dissolving cellulose from wood pulp in a non-volatile solvent, forming a viscous dope that is extruded through spinnerets and coagulated into continuous filaments. The production uses a mainly closed-loop process, with the solvent largely recovered and reused, which minimizes emissions.

The solvent used is typically N-methylmorpholine N-oxide (NMMO). The dope is wet-spun to form fibers, which are then washed, drawn, and dried. The method allows high solvent-recovery rates and a relatively low environmental footprint compared with some other cellulose processes, provided sustainable wood sources and proper solvent management are ensured. Pulp sources often include sustainably managed eucalyptus or hardwoods, along with certifications to verify responsible forestry.

Properties of Lyocellfibrer include high strength, especially when wet, good dimensional stability, and a soft, smooth hand. They exhibit strong moisture absorption and good breathability, which contributes to comfort in textiles. The fibers take up dyes well and can be woven or knitted into a range of fabrics, from lightweight shirts to denser suiting materials. They are often blended with other fibers to balance performance and cost and are known for durability and good aging characteristics.

Applications span apparel (shirts, dresses, underwear, activewear), home textiles (sheets, towels), and nonwoven products. End-of-life biodegradation is possible under suitable conditions, making Lyocellfibrer a commonly cited example of more sustainable cellulose fibers when sourced and manufactured responsibly.