Abstract: To produce fine-tex siro-compact-spun weaving yarn, Truetzschler blowing-carding unit, Toyota RX240 siro-compact spinning machine and other associated equipment were used. Three kinds of viscosefiber in different fineness were chosen to increase the cohesion between fibers and reduce false draft.Considering the result yarn is extra fine, different measures were taken in each stage of the spinning process,for example, the principle of “small but frequent feed, more opening and less beating, enlarged gauge” was adopted for the blowing-carding stage; rationally designed speed and gauge for the combing stage; two-step drawing with “small-to-large” drafting ratio for drawing stage; “lower roving weight per unit and larger twist factor, and smaller roving package” for roving stage; using reasonable roving feed distance and larger twist,and appropriately reducing the spindle and machine speed for spinning stage. Moreover, the temperature and humidity of workshop were reasonably controlled to ensure the quality of yarn.

Key words: viscose fiber; siro-compact-spun weaving yarn; blowing-carding unit; process design; yarn quality