Influence of flat heel-toe difference of carding machine on yarn hairiness

The hairiness of yarns processed by 24 plans under four-grade flat heel-toe difference,two-grade cylinder speed and three-grade carding output was tested by YG172 yarn hairiness tester.The test results were analyzed by SPSS software.The results show that heel-toe difference has notable influence on yarn hairiness index.When cylinder speed is 394 r/min,the yarn hairiness is the least under 0.42 mm heel-toe difference;and while cylinder speed is 296 r/min,the yarn hairiness is the least under 0.56 mm heel-toe difference.In all test plans,the heel-toe differences of 0.56 mm and 0.42 mm are beneficial to hairiness reduction as a whole;and the yarn hairiness is the most under 0.14 mm heel-toe difference,which shows that too small a heel-toe difference is not conducive to hairiness reduction.