Comparison of the results of different hairiness testers for cotton-Tencel blended ring, compact and vortex yarns

Hairiness results of Zweigle G566, Uster Zweig le Hairiness Tester 5 (UZHT5) and Uster Tester 5 S800. (UT5) have been compared for ring, compact and vortex yarns. For this purpose, 100% cotton, cotton-Tencel LF (67:33, 50:50 and 33:67) and 100% Tencel LF yarns have been produced from each spinning system. In general, correlations between the results of Zweig le G566 and UZHT5 devices, working with the same measuring principle, are found statistically significant at 99% confidence level for all spinning systems. However, the correlations between the results of UT5 against Zweigle G566 or UZHT5 are also found statistically significant at 95% confidence level for all spinning systems. But, for vortex yarns, negative correlation coefficients are detected between the results of UT5 against Zweigle G566 or UZHT5 in terms of blend ratio. This situation could be the result of wrapped structure of the vortex yarn and different measuring principles of the hairiness testers.