Abstract: Based on systematic study of the convenitional drafting system with double apron flexible nips of the ring spinning machine, a condensed spinning draft system characterized by negative pressure organization, stable gripping and echelon drawing was designed and developed, and the condensed spinning drafting system mechanism and practical applicattion effect were described. When raw cotton and preparation spinning conditions were identical, experimental results revealed that the condensed spinning drafting system is remarkably superier to the ordinary ring spinning or compact spinning in yarn evenness, so it is worthy to carry out a large-scale promotion of the system.

Key words: condensed spinning, echelon drafting, stable grip, friction circles, yarn quality