On the basis of the development of new production,this paper discusses the technics of blended yarns and semi-worsted spinning,in terms of the primary characteristics of three kinds of fibers,optimizing technological parameters of spinning and emphasizing the technic instruments to improve production quality.

Application of polylactic acid in hot melting sizing for worsted yarns;

For semi-worsted yarn composition of the complexity of the fiber spinning,knitting different stitch structure,selection of the four groups of the distribution of a typical semi-worsted yarns and knitting stitch,use the orthogonal testing method to judge the fiber content and knitting stitch influencing wearability of semi-worsted knit fabric.