Abstract: The paper analyzes the raw material mixing mode, production process and technological configuration of 10.8 tex combed cotton/hemp/black viscose grey siro yarn. In view of the characteristics of hemp fiber, i.e., high stiffness and easy damage during spinning, the paper discusses the pretreatment of hemp fiber, mixing method of raw material and process optimization. In order to reduce neps, the carding equipment should be ensured in good condition, setting suitable speed and gauge. In order to reduce yarn break, the operating speed should be reduced, and the ring and traveler should be optimized. The 10.8 tex combed cotton/hemp/black viscose grey siro yarn was successfully spun. With good yarn quality, it can meet the requirements.

Key words: viscose; hemp; pretreatment; colored nep; mixing; colored spun yarn