Blending effects and performance of ring-, rotor-, and air-jet-spun color-blended viscose yarns

Blending effect of color blended yarns, which plays a critical important role to the fabrics styles, is affected by yarn structure, spinning processes, and blending methods. In this study, color blended viscose yarns were produced by compact ring spinning, rotor spinning and air-jet vortex spinning with single-passage and three-passage color-blended slivers. The blending effect of these yarns was evaluated by Hamilton transfer index. Additionally, yarn performance was tested, compared and analyzed, including strength, hairiness and evenness. Results show that the blending effect of the rotor spun yarns is the best with both types of slivers. Even though such yarns have wrap fibers on the surface like the air-jet vortex yarns, the yarn structures are different. Compared to the tightly wrapped fiber on the rotor-spun yarns, wrapped fibers form a shield on core fibers of the air-jet vortex yarns. Among the three types of yarns, compact ring yarns have higher mean value of evenness and its value also changes with the passage number of sliver, yarn linear density and the spinning method. Hairiness of air-jet vortex yarn is the lowest, followed by rotor spun yarn and then the compact ring-spinning yarn. While physical performance such as tenacity, breaking elongation, and break work of compact-ring-spinning yarns are the greatest among the three types of yarns.