CHITOSAN-CONTAINING SPUN YARN AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed is a chitosan gradated spun yarn in which chitosan-coated staple fibers decrease in relative concentration from outer to inner region on a cross section of the yarn. Consisting of 5-99 wt% of a chitosan-coated staple fiber and 1-95 wt% a non-coated staple fiber, the chitosan gradated spun yarn comprises chitosan in an amount of 1-5 wt% in an outer area on the cross section of the yarn, in an amount of 0.5-1 wt% in a middle area, and in an amount of 0.1-0.5 wt% in a central area. The yarn shows the same fiber properties as those of the spun yarn made of cellulose or proteins and can perform the functions of pure chitosan fibers in spite of its low content of chitosan. Also, the yarn is greatly improved not only in the adhesion between chitosan and fibrous components, but also in the durability of chitosan through a process including the pretreatment of the fiber, the aging of the chitosan solution, and post-coating fixation. Also provided is a method for producing such a chitosan gradated spun yarn.