Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 60-64.doi: 10.13475/j.fzxb.20201008005

• Textile Engineering • Previous Articles     Next Articles

Exploration of image-based testing method for yarn twist in air-jet vortex spinning

LI Hao, XING Mingjie(), SUN Zhihao, WU Yao   

  1. College of Textile and Clothing, Qingdao University, Qingdao, Shandong 266071, China
  • Received:2020-10-29 Revised:2020-11-19 Online:2021-02-15 Published:2021-02-23
  • Contact: XING Mingjie E-mail:xmjqdu@126.com

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Abstract:

In order to find an effective method suitable for yarn twist test produced by air-jet vortex spinning, with the help of scanning electron microscope, the twist of the yarn was tested by the appearance and cross-section images of the air-jet vortex spinning yarns, based on the comparative analysis of yarns made via air-jet vortex spinning and the traditional ring-spinning. Photoshop was used to process the cross-sectional images of the air-jet vortex spinning yarn, determining the outer layer and the inner layer of the yarns. The relationship between the ratio of inner and outer fibers of air-jet spun yarns and twists were analyzed. The research results show that due to the special structure of the air-jet vortex spinning yarn, the traditional twisting and untwisting method is not suitable for the air-jet vortex spinning yarn twist test. It is feasible to test the twist by the image of air jet vortex spinning yarn. There is a negative correlation between the ratio of the number of fibers in the inner and outer layers of the air-jet vortex spinning yarn and its twist.

Key words: air-jet vortex spinning yarn, yarn structure, twist, ratio of number of fibers in inner and outer layers, image

CLC Number: 

  • TS104.2

Fig.1

Picture of yarn appearance under electron microscope(×57)"

Fig.2

Structure model of air-jet vortex spinning yarn"

Fig.3

Test of yarn twist by image(×200)"

Fig.4

Ideal model of yarn surface and schematic diagram of twist angle"

Tab.1

Image method and counting method to test twist of air-jet vortex yarn"

线密度/tex 平均捻系数
图像法 计数法
36 309.6 310.4
38 330.6 328.1
40 344.8 348.6

Fig.5

Cross section of air-jet vortex yarn under electron microscope(×350)"

Tab.2

Test results of internal and external fiber ratio of sample yarn"

试样编号 Onion指数 内外层纤维数量比 标准差
1# 0.83 2.95 0.069
2# 0.85 2.90 0.089
3# 0.76 2.67 0.036

Tab.3

Test results of twist coefficient of sample yarn"

纱线线密
度/tex		 捻系数 内外层纤维
数量比		 捻系数与
线密度比
36 306.0 2.51 8.50
36 309.6 2.48 8.60
36 312.1 2.45 8.67
38 330.6 2.44 8.70
38 323.0 2.51 8.50
38 333.3 2.42 8.77
40 344.8 2.47 8.62
40 339.6 2.51 8.49
40 319.2 2.52 7.98
平均值 38 324.2 2.48 8.54
标准差 1.732 13.701 0.036 0.230

Tab.4

Pearson correlation coefficient results"

类别 线密度 捻系数 内外层纤
维数量比		 捻系数与
线密度比
线密度 1
捻系数 0.800** 1
内外层纤维数量比 0.247 -0.222 1
捻系数与线密度比 -0.426 0.203 -0.750* 1
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