Impacts of Yarn Hairiness and Voluminous on Weft Yarn Speed and Twist Loss in Air-Jet Weaving

Abstract

The velocity and twist loss of weft yarns in air-jet weft insertion is affected by the type of yarn used as a weft. In this work, ring- and rotor-spun yarns of 16Ne were used as weft yarns and velocity and twist loss differences between these yarns were investigated. The constant air pressures and loom speed were used to measure the velocity difference between the two yarns. For twist loss, the speed of the loom and relay nozzle pressures were varied in the range of (300–510 rpm loom speed, 2–4 bar left side relay nozzle air pressure (LSRNP) and 3–6.5 bar right-side relay nozzle air pressure (RSRNP). A full factorial design was used to design and analyze the results of the experiment for twist loss. It is observed that the average velocity (m/s) and twist loss (TPM) of the ring-spun yarns are higher than those of the rotor-spun yarns. Additionally, it has been found that for both types of yarn, the twist loss increases when the loom’s speed falls and the air pressure in the relay nozzles rises. However, the highest twist loss difference between the two yarns is observed at the highest speed of the loom.

Keywords

• yarn hairiness
• yarn diameter
• air-jet loom
• yarn velocity
• twist loss