Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (06): 85-90.doi: 10.13475/j.fzxb.20200901406

• Textile Engineering • Previous Articles     Next Articles

Simulation study on effect of drafting on sliver unevenness

HE Yaqin1, BI Xuerong1, QIAN Xixi1, RUAN Jun2, YU Chongwen1,3()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    3. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China
  • Received:2020-09-04 Revised:2021-02-20 Online:2021-06-15 Published:2021-06-28
  • Contact: YU Chongwen E-mail:yucw@dhu.edu.cn

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Abstract:

In the research of sliver unevenness after drafting, the change of fiber arrangement is the key to the problem, which is caused by fiber movement. In order to explore the influence of the accelerated point distribution on the unevenness of sliver after drafting, the fiber arrangement in the measured sliver was simulated, referred to as actual sliver. The fiber movement during the drafting process in the ideal sliver and the actual sliver was simulated, respectively. The unevenness of the actual sliver after drafting with different accelerated point distribution were calculated, and experiments were carried out. The results showed that compared with the ideal sliver, the actual sliver can better reflect the influence of the accelerated point distribution on the unevenness of the sliver after drafting, and an increase in the accelerated point variance is found to associate to the increase in the sliver unevenness. The unevenness of the actual cotton sliver after simulated drafting is roughly consistent with the trend of the measured value.

Key words: drafting, accelerated point distribution, fiber end, fiber arrangement, sliver unevenness

CLC Number: 

  • TS101.1

Tab.1

Specifications of material"

类型 纤维平均
长度/mm 		纤维平均
线密度/dtex 		平均条干线
密度/ktex 		平均条干
不匀率/%
生条 23.6 1.37 4.65 6.35
半熟条 23.6 1.37 5.00 6.65
熟条 25.8 1.45 4.42 5.14
不匀生条 25.2 1.74 3.90 11.50

Fig.1

Schematic diagram of method of generating number of fiber ends"

Fig.2

Schematic diagram of method of calculating unevenness of sliver"

Fig.3

Influence of fiber number in cross section on simulated evenness(a) and calculation time(b)"

Fig.4

Measured and simulated values of sliver unevenness. (a)Card sliver; (b)Drawn sliver"

Fig.5

Distribution of accelerated point in drafting zone"

Tab.2

Fitting results of accelerated point distribution of tracer fibers with different lengths"

类型 45 mm
(R1) 		38 mm
(R2) 		30 mm
(R3) 		25 mm
(R4) 		20 mm
(R5) 		15 mm
(R6) 		10 mm
(R7) 		5 mm
(R8)
μ 1.08 2.47 3.78 5.49 9.72 11.26 12.60 16.13
σ 0.945 1.762 1.868 2.799 3.789 3.899 3.727 5.895

Fig.6

Influence of accelerated point variation on sliver unevenness after drafting"

Tab.3

Measured and simulated values of sliver unevenness after drawing"

类型 实测不
匀率/% 		模拟不匀率/%
实测变速点分布 等变速点
生条喂入 10.30 4.55 4.29
9.86 3.85 3.60
10.20 2.88 2.56
熟条喂入 6.20 2.78 2.49
5.90 2.75 2.46
6.37 3.39 3.16
不匀条喂入 15.41 7.19 6.90
10.94 3.98 3.69
11.88 5.98 5.83
10.38 5.19 5.04
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