Abstract: Segment color yarn is a kind of fancy yarn which color segmentation regularly change in Yarn length direction. The main production processes produce slubby yarn effect. So these processes can not achieve mass promotion. In this paper, draft system of ring spinning machine was improved to produce equal linear density segment color cotton yarn. The effect of segment time and two component ratio on physical properties of equal linear density segment color yarn is investigated. Results indicate that high performance equal linear density segment color yarn can be produced by proper control of back zone draft processes. Improvement projects are also been supplied. The results provide reference for industrial production.

Key words: constant linear density, segment colored yarn, draft, segment time