Abstract:

The flax yarn spun with wet spinning process is poor in evenness, high in stiffness, and easy to be broken during weaving. In order to solve the problems, a biochemistry treatment peocess was used to discuss the influence on the properties of flax yarns. The yarns were first modified with NaOH/urea solution, and then treated withd laccase/ acidxylanase compound enzyme. The results indicate the optimum technology parameters as followed.  The dosage of NaOH is 6.5%(o.w.f) in the modification of NaOH/urea solution, the dosage of compound enzyme are separate laccase 4.0%(o.w.f) and acid xylanase 4.5%(o.w.f) in compound enzyme process, the treatment temperature is 50℃, and the time is 90 min. Under this biochemical treatment process, the yarn evenness CV increases 41%, capillary effect increases 134%, and the elongation at break increases 95.8%. The physical and mechanical properties improve are improved significantly. It can create a certain condition for the weaving of flax yarns.

Key words: flax yarn, laccase, acid xylanase, biochemical treatment