Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 153-158.doi: 10.13475/j.fzxb.20181007006

• Machinery & Accessories • Previous Articles     Next Articles

Effect of bypass channel on rotor-spun yarn properties in rotor spinning

LIN Huiting1(), AKANKWASA Nicholus Tayari2, ZHANG Yuze2, SHI Qianqian2, WANG Jun2   

  1. 1. College of Textile and Fashion, Quanzhou Normal University, Quanzhou, Fujian 362000, China
    2. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2018-10-31 Revised:2018-11-17 Online:2019-02-15 Published:2019-02-01

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Abstract:

In order to reduce or eliminate the vortices generated at the transport channel inlet so as to decrease its adverse effect on fiber configuration, a bypass channel located on the extension of the long side of the transport channel was introduced as an air supply channel. The numerical simulation method was adopted to study the airflow dynamics of the modified transport channel. Combining with the spinning tests and fiber configuration tests, the effectiveness of the bypass channel in improving the airflow field and rotor spun-yarn properties was evaluated. The results show that by adopting the bypass channel, the vortices generated at the transport channel can be eliminated, and the air velocity in fiber separation area is increased, thus increasing the fiber peeling-drawing ratio. The rotor spinning machine with the bypass channel has a positive effect on improving the yarn tenacities as well as decreasing the number of hook fibers in the rotor groove. This indicates that eliminating the vortices and increasing the fiber peeling-drawing ratio are beneficial to fiber morphology, thus improving the yarn fracture strength.

Key words: rotor spinning, transport channel, bypass channel, airflow, yarn quality, fiber configuration

CLC Number: 

  • TS104.1

Fig.1

Schematic diagram of bypass channel"

Fig.2

Geometric model and boundary conditions"

Fig.3

Velocity streamlines of different transport channel sections"

Fig.4

Velocity contours of different fiber separation sections in conventional and modified rotor spinning units"

Tab.1

Spinning parameters"

所用原料 原料参数 纱线线
密度/tex		 纺纱工艺参数 温度/
℃		 湿度/
%
纤维长
度/mm		 纤维线密
度/dtex		 条子定
量/tex		 分梳辊转速/
(r·min-1)		 转杯转速/
(r·min-1)		 引纱速度/
(r·min-1)
棉 29 1.8 4 200 34 6 500 51 000 61.11 30 ± 2 50 ± 2
4 200 42 68.75
粘胶 38 1.67 4 312 34 60.44
棉/粘胶(50/50) - - 3 250 34 60.44

Fig.5

Classification of fiber configuration"

Fig.6

Fiber images obtained by scanning and after processing in MatLab. (a)After scanning;(b)MatLab treated"

Tab.2

Comparison of yarn tenacitycN/tex"

纺纱器
类别		 34 tex
棉纱		 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 13.80 13.62 7.99 9.86
改进 15.59 15.04 8.67 10.61

Tab.3

Analysis on variance of yarn tenacity of different yarnscN/tex"

纱线类别 F值 P值
34 tex棉纱 51.72 0.000
42 tex棉纱 31.67 0.000
34 tex粘胶纱 22.77 0.000
34 tex棉/粘胶混纺纱 18.34 0.000

Tab.4

Comparison of yarn CV%"

纺纱器
类别		 34 tex
棉纱		 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 14.29 13.97 14.44 17.42
改进 15.63 14.34 15.0 17.18
显著性检验 AB AA AA AA

Tab.5

Comparison of yarn thin places (-50%)个/km"

纺纱器
类别		 34 tex
棉纱		 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 18 4 4 36.7
改进 2 20 8 28.89
显著性检验 AB AA AA AA

Tab.6

Comparison of yarn thick places (+50%)个/km"

纺纱器
类别		 34 tex棉纱 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 92 32 22 75.56
改进 48 30 22 72.2
显著性检验 AB AA AA AA

Tab.7

Comparison of yarn neps (+280%)个/km"

纺纱器
类别		 34 tex棉纱 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 38 10 28 16.67
改进 6 2 30 6.67
显著性检验 AB AA AA AA

Tab.8

Comparison of yarn hairiness"

类别 34 tex
棉纱		 42 tex
棉纱		 34 tex
粘胶纱		 34 tex
混纺纱
传统 4.88 11 8.64 11.62
改进 5.64 9.86 4.54 4.94
显著性检验 AA AA AB AB

Tab.9

Percentages of different fiber configurations%"

纤维类别 1 2 3 4 5 6 7 8
传统 0 43.28 8.96 15.67 2.99 13.43 10.45 5.22
改进 0 54.34 5.20 8.09 2.89 12.72 11.56 5.20
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