Abstract:

In order to improve the appearance and increase the yarn quality of cloud yarn, the influences of three different drawing methods on the appearance and yarn quality of cloud yarn were discussed. Different cloud yarns of 29.2 tex / 14.6 tex/9.7 tex/7.3 tex/5.8 tex were spun on TH558 super high draft ring spinning machine, which was equipped with four-line draft system and four roller by changing the feeding way of decorative yarn, namely feeding from the back roller, medium-back roller and medium-front roller of spinning frame respectively under the condition of same other process parameters. Using VHX-5000 digital microscopic system to observe and analyze the appearance of cloud yarn, and gave a testing and comparative analysis for its tensile property, evenness and hairiness. The results show that different drawing methods will produce different yarn appearance, and compared with the other two ways, the yarn spun by decorative yarn feeding from the medium-back roller has a better yarn quality, namely more useful hairiness(within 3mm) and less harmful hairiness（beyond 3mm), higher strength and yarn quality index. Also, its structure is relatively compact and the three-dimension effect is stronger.

Key words: cloud yanr, breaking strength, hairiness, evenness