Abstract

This study explores the impact of doubling and auto leveling in draw frame on the quality of rotor yarns. Virgin cotton of Ivory Coast (55%) and waste cotton (dropping-1: 25% and dropping-2: 20%) used as raw material. Rotor-spun yarns of 20 Ne were manufactured from the slivers produced from carding machine, breaker draw frame, and finisher draw frame without and with auto leveler. The quality parameters of slivers and rotor yarns such as Um%, CVm%, Imperfections (thick place, thin place, and neps), and count strength product (CSP) were tested and analyzed. The Um%, CVm% of different sliver gradually decreased due to the action of doubling and auto leveler. In yarns, Um%, CVm% showed a similar trend as slivers. Thick places, thin places and neps also exhibited the decreasing pattern with the increase of sliver doubling and the use of auto leveler. The quality of yarns improved with the increase of doubling and yarns produced from finisher draw frame sliver with auto leveler showed the best result. The reason can be attributed to the most evened out sliver with better fiber orientation due to the combined action of doubling and auto leveling.

Keywords:Doubling; Auto leveler; Neps; Imperfections