A NEW PHOTOELECTRIC DEVICE FOR THE MEASUREMENT OF YARN DIAMETER AND YARN EVENNESS - PART III - COMPUTER-AIDED ONLINE MEASUREMENT OF YARN EVENNESS ON THE RING-SPINNING FRAME

A new on-line measurement system, Onlineven, based on photoelectric pr inciples, is evaluated for measuring yam evenness, Descriptions of the sensor device used have been presented in Parts I and II of this seri es. Yarn specifications (linear density, twist) and measurement positi ons are the main topics discussed. Comparisons between Onlineven and t he Uster Evenness Tester are also discussed. The results show that it is possible to use the Onlineven on-line-measurement system with yam-g uide wheels for the measurement of the yarn evenness at various linear densities (12.9-29 tex) and twists (590-1396 turns/m) at position 2. The differences in yarn evenness between Onlineven and Uster Tester II I are all less than 5%. The mean deviation of yarn evenness of this sy stem is small and limited to +/-1%.