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
[1] MARTINDALE J G. A new method of measuring the irregularity of yarns with some observations on the origin of irregularities in worsted slivers and yarns[J]. Journal of the Textile Institute, 1945(36):35-47.
[2] RAO S J. The mathematical model for the ideal sliver and its applications to the theory of roller drafting[J]. Journal of the Textile Institute, 1961(52):570-600.
[3] BROWN G H, LY G N. Statistics for the number of fiber ends in a segment of a random assembly of aligned fibers[J]. Textile Research Journal, 1985, 55 (4):206-210.
doi: 10.1177/004051758505500402
[4] ZEIDMAN M, SUH M W, BATRA S K. A new perspective on yarn unevenness: components and determinants of general unevenness[J]. Textile Research Journal, 1990, 49(1):28-34.
doi: 10.1177/004051757904900105
[5] 张弘强, 胡远波, 姜展, 等. 生条中纤维左头端的分布[J]. 纺织学报, 2016, 37(5):28-31.
ZHANG Hongqiang, HU Yuanbo, JIANG Zhan, et al. Distribution of fiber left ends in card sliver[J]. Journal of Textile Research, 2016, 37(5):28-31.
[6] 严广松, 苏玉恒. 理想纱条的纤维排列与随机过程分析[J]. 河南工程学院学报(自然科学版), 2014, 26(1):1-5.
YAN Guangsong, SU Yuheng. The alignment of fibers in ideal sliver and its analysis by stochastic process[J]. Journal of Henan Institute of Engineering (Natural Science Edition), 2014, 26(1):1-5.
[7] JIANG Zhan, HU Yuanbo, KUANG Xueqin, et al. Simulation on fiber random arrangement in the yarn[J]. The Journal of The Textile Institute, 2014.DOI:10.1080/00405000.2014.891685.
doi: 10.1080/00405000.2014.891685
[8] 郁崇文. 纺纱学[M]. 中国纺织出版社, 2014:112-115.
YU Chongwen. Spinning science[M]. Beijing: China Textile & Apparel Press, 2014:112-115.
[9] MUPFUDZE KUDAKWASHE D, CAO Qiaoli, SHEN Yuanying, et al. Fiber motion and the accelerated point distribution in roller drafting[J]. Textile Research Journal, 2019. DOI:10.1177/0040517518767150.
doi: 10.1177/0040517518767150
[10] SUN Na, JIANG Zhan, YU Chongwen. Modeling roller drafting based on fiber arrangement in the sliver[J]. The Journal of the Textile Institute, 2018. DOI:10.1080/0040500.2018.1427909.
doi: 10.1080/0040500.2018.1427909
[11] 严广松, 路允芳, 郁崇文. 牵伸区浮游纤维变速点分布的理论研究[J]. 纺织学报, 2007, 28(9):23-26.
YAN Guangsong, LU Yunfang, YU Chongwen. Theoretical study on the distribution of accelerated points of floating fibers in the drafting zone[J]. Journal of Textile Research, 2007, 28(9):23-26.
[12] 丁祥, 章华军, 杨道明, 等. 精梳棉涤纶混纺套染纱的生产实践[J]. 棉纺织技术, 2020(8):59-62.
DING Xiang, ZHANG Huajun, YANG Daoming, et al. Production practice of combed cotton polymer blended over dyeing yarn.[J]. Cotton Textile Technology, 2020(8):59-62.
[13] 刘金辉, 李维周, 佘崇舰. 圣麻Coolplus混纺纱生产实践[J]. 棉纺织技术, 2008(5):40-42.
LIU Jinhui, LI Weizhou, SHE Chongjian. Practice of producing shengma coolplus blended yarn[J]. Cotton Textile Technology, 2008(5):40-42.
[14] 朱秋凉. 赛络纺棉氨纶包芯纱的生产及应用[J]. 棉纺织技术, 2007(12):34-36.
ZHU Qiuliang. Production and application of siro spinning cotton spandex core-spun yarn.[J] Cotton Textile Technology, 2007(12):34-36.
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