Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 59-66.doi: 10.13475/j.fzxb.20200504408

• Textile Engineering • Previous Articles     Next Articles

Effect of wrapping and twisting on mechanical properties of air-jet vortex spun yarns

CHEN Meiyu1,2(), LIU Yulin3, HU Geming3, SUN Runjun1,2   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Key Laboratory of Functional Textile Material and Product in Ministry of Education, Xi'an Polytechnic University,Xi'an, Shaanxi 710048, China
    3. Shaanxi Huayan Aero-Instrument Co., Ltd., Hanzhong, Shaanxi 723102, China
  • Received:2020-05-20 Revised:2020-10-16 Online:2021-01-15 Published:2021-01-21

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Abstract:

In order to investigate the effect of winding and twisting on the mechanical properties of the air-jet vortex spun yarns, the deformation and force loading of the fibers in air-jet vortex spun yarn during stretching process was analyzed theoretically in this paper, and the effect of the vortex pressure and the spinning speed on the mechanical properties of the vortex spun yarn was investigated in detail. The results indicate that the spiral wrapping of the outer fibers play a decisive role in the mechanical properties of the yarn. The vortex pressure and the spinning speed are the two main factors affecting wrapping and twisting effect of the vortex spinning. When the spinning speed was fixed as 280 m/min, the breaking tenacity and the initial modulus of the yarn demonstrate an increase followed by a decrease, with the breaking elongation virtually unchanged, with the increase of the vortex pressure. When the spinning speed was fixed as 280 m/min with the vortex pressure being 0.55 MPa, the optimum mechanical properties of the yarn were obtained. When the vortex pressure was fixed as 0.45 MPa, with the increase of the spinning speed, the breaking tenacity and the breaking elongation of the yarn both show a slight decreasing trend, and the initial modulus shows a decrease and then stabilized.

Key words: vortex spun yarn, wrapping and twisting, vortex pressure, spinning speed, mechanical properties

CLC Number: 

  • TS101.2

Fig.1

Overall longitudinal characteristics of vortex spinning yarn"

Fig.2

SEM image of local longitudinal characteristics of vortex spinning yarn(×50)"

Fig.3

Schematic diagram of axial tensile model of vortex spinning yarn"

Fig.4

Schematic diagram of force analysis of outer fibers during tensile process of vortex spinning yarn"

Tab.1

Equipment parameters of HYF air-jet vortex spinning machine"

前罗拉
与中罗拉
距离/mm		 中罗拉
与第3罗拉
距离/mm		 第3与
第4罗拉
距离/mm		 前罗拉
与空芯锭
距离/mm		 空芯锭
腔的
直径/mm		 横动
角度/
(°)
44.5 1.1 16 44.5 1.1 16

Tab.2

Processing parameters of vortex spinning yarn samples"

样品
编号		 涡流压力/
MPa		 纺纱速度/
(m·min-1)		 喂入比 张力比 总牵伸
倍率		 主牵伸
倍率
1# 0.45 280 0.97 1.025 162 27
2# 0.50 280 0.97 1.025 162 27
3# 0.55 280 0.97 1.025 162 27
4# 0.60 280 0.97 1.025 162 27
5# 0.65 280 0.97 1.025 162 27
6# 0.45 320 0.97 1.025 162 27
7# 0.45 360 0.97 1.025 162 27
8# 0.45 400 0.97 1.025 162 27

Fig.5

SEM images of yarns under different vortex pressures(×50)"

Fig.6

Relationship between vortex pressure and wrapping and twisting index of the yarn forming"

Fig.7

SEM images of yarns formed at different spinning speeds(×50)"

Fig.7

SEM images of yarns formed at different spinning speeds(×50)"

Tab.3

Effect of different spinning speeds on wrapping and twisting index of vortex spinning yarn"

纺纱速度/
(m·min-1)		 螺旋包缠角 螺距
平均值/
(°)		 CV值/
%		 平均值/
μm		 CV值/
%
280 30.2 7.7 644.0 7.2
320 30.1 7.1 756.7 10.4
360 28.6 8.1 881.3 10.0
400 26.1 13.2 962.0 8.3

Tab.3

Effect of different spinning speeds on wrapping and twisting index of vortex spinning yarn"

纺纱速度/
(m·min-1)		 螺旋包缠角 螺距
平均值/
(°)		 CV值/
%		 平均值/
μm		 CV值/
%
280 30.2 7.7 644.0 7.2
320 30.1 7.1 756.7 10.4
360 28.6 8.1 881.3 10.0
400 26.1 13.2 962.0 8.3

Fig.8

Effect of different vortex pressures on mechanical properties of spinning yarn. (a) Breaking tenacity; (b) Breaking Elongation Rate; (c) Elastic Modulus"

Fig.8

Effect of different vortex pressures on mechanical properties of spinning yarn. (a) Breaking tenacity; (b) Breaking Elongation Rate; (c) Elastic Modulus"

Tab.4

Effect of different spinning speeds on mechanical properties of vortex spinning yarn"

纺纱速度/(m·min-1) 断裂比强度 断裂伸长率 弹性模量
平均值/(cN·tex-1) CV值/% 平均值/% CV值/% 平均值/(cN·tex-1) CV值/%
280 23.28 10.32 10.17 7.80 32.60 8.95
320 23.18 9.30 9.85 7.29 30.06 8.59
360 22.98 6.54 9.83 5.18 31.08 6.77
400 22.52 12.77 9.23 13.67 31.36 11.22

Tab.4

Effect of different spinning speeds on mechanical properties of vortex spinning yarn"

纺纱速度/(m·min-1) 断裂比强度 断裂伸长率 弹性模量
平均值/(cN·tex-1) CV值/% 平均值/% CV值/% 平均值/(cN·tex-1) CV值/%
280 23.28 10.32 10.17 7.80 32.60 8.95
320 23.18 9.30 9.85 7.29 30.06 8.59
360 22.98 6.54 9.83 5.18 31.08 6.77
400 22.52 12.77 9.23 13.67 31.36 11.22
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