Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 57-62.doi: 10.13475/j.fzxb.20210402006

• Textile Engineering • Previous Articles     Next Articles

Influence of cotton/polyester sheath-core structure roving parameters on structure and performance of spun yarn

GUO Mingrui(), GU Yinhua, GAO Weidong   

  1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2021-04-05 Revised:2022-03-18 Online:2022-06-15 Published:2022-07-15

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Abstract:

In order to investigate the influence of roving parameters on the appearance and properties of cotton/polyester sheath-core staple yarns by the two-step spinning process, the effects of factors such as spinning settings, roving linear density, roving twist and core/sheath fiber ratio on the exposure of core fiber and yarn properties were studied. With the help of image processing technology, the core fiber exposure ratio was quantitatively measured. The results show that as the width of fiber bundle output from roving frame increases from 10.2 mm to 16.3 mm, the eccentricity of core fiber bundle in roving decreases from 26.5% to 19.2%, and the exposure ratio of core fiber in yarn decreases by 11.3% (29.2 tex) and 12.3% (19.4 tex). When the roving count increases or the twist coefficient decreases, the core fiber exposure proportion decreases. When the proportion of polyester core fiber increased from 15% to 25%, the exposure proportion of core fiber increased by 35.6% (29.2 tex) and 30.5% (19.4 tex).

Key words: sheath-core staple yarn, core fiber ratio, core fiber exposure proportion, roving, spun yarn

CLC Number: 

  • TS104.1

Tab.1

Cotton fiber quality index"

马克隆值 上半部平均长度/mm 长度整齐度/% 短绒率/%
3.94 29.32 83.5 12.81

Tab.2

Experimental scheme I"

2种细纱样品编号 粗纱样
品编号		 涤纶含
量/%		 前集
束器
29.2 tex 19.4 tex
— — C1 15.0
A1 B1 C2 20.0 有
— — C3 25.0
— — C4 15.0
A2 B2 C5 20.0 无
— — C6 25.0

Fig.1

Roving process. (a) With front buncher; (b) Without front buncher"

Tab.3

Experimental scheme II"

2种细纱样品编号 粗纱捻
系数		 皮芯粗纱定量/
(g·(10 m)-1)
29.2 tex 19.4 tex
A3 B3 90
A4 B4 100 4
A5 B5 110
A6 B6 90
A7 B7 100 5
A8 B8 110
A9 B9 90
A10 B10 100 6
A11 B11 110

Tab.4

Experimental scheme III"

2种细纱样品编号 涤纶含
量/%		 粗纱定量/
(g·(10 m)-1)		 粗纱
捻系数
29.2 tex 19.4 tex
A12 B12 15
A13 B13 20 6 90
A14 B14 25

Fig.2

Original picture of cotton/polyester sheath-core spun yarn"

Fig.3

Binarization diagram of cotton/polyester sheath-core spun yarn"

Fig.4

Cross section of sheath-core roving"

Tab.5

Degree of eccentricity of core fiber bundle of sheath-core roving %"

粗纱样品编号 C1 C2 C3 C4 C5 C6
芯纤维偏心度γ 30.3 32.3 40.7 19.2 24.1 26.5

Tab.6

Influence of width of roving twisting zone on core fiber exposure ratio"

细纱线密
度/tex		 不同前钳口须条宽度下芯纤维外露比例/%
10.2 mm(有前集束器) 16.3 mm(无前集束器)
29.2 4.50 3.99
19.4 5.19 4.55

Tab.7

Influence of linear density and twist of roving on core fiber exposure ratio"

细纱线
密度/tex		 粗纱定量/
(g·(10 m)-1)		 不同粗纱捻系数下芯纤维外露比例/%
90 100 110
29.2 4.0 4.20 4.30 4.41
5.0 3.91 3.99 4.01
6.0 3.43 3.67 3.74
19.4 4.0 4.76 4.99 5.17
5.0 4.36 4.55 4.77
6.0 3.89 4.48 4.54

Tab.8

Result of two-way ANOVA of core fiber exposure ratio of 29.2 tex yarn by roving count and twist"

差异源 偏差平方和 自由度 均方 F P
行 0.714 4 2 0.357 2 103.706 5 0.000 4
列 0.066 8 2 0.033 4 9.690 3 0.029 3
误差 0.013 8 4 0.003 4
总计 0.794 9 8

Tab.9

Influence of core fibre proportion of roving and yarn count on core fiber exposure ratio"

细纱线密
度/tex		 不同芯纤维含量下芯纤维外露比例
15% 20% 25%
29.2 3.09 3.43 4.19
19.4 3.51 3.89 4.58

Tab.10

Result of two-way ANOVA of core fibre exposure ratio by yarn count and core fibre ratio"

差异源 偏差平方和 自由度 均方 F P
行 0.268 8 1 0.268 8 435.918 9 0.002 3
列 1.221 6 2 0.610 8 990.513 5 0.001 0
误差 0.001 2 2 0.000 6
总计 1.491 7 5

Tab.11

Influence of roving twisting zone width on yarn quality"

细纱样
品编号		 条干
CVm/%		 断裂强
力/cN		 断裂伸
长率/%		 毛羽/(根·(100 m)-1)
≤2 mm ≥3 mm
A1 14.83 350.24 5.37 675.2 23.1
A2 15.22 345.67 5.43 936.2 34.8

Tab.12

Influence of linear density and twist of roving on yarn quality"

细纱样
品编号		 条干CVm
值/%		 断裂强
力/cN		 断裂伸
长率/%		 毛羽/(根·(100 m)-1)
≤2 mm ≥3 mm
A3 14.73 360.21 5.15 875.2 32.8
A4 15.42 345.67 5.43 809.4 34.8
A5 13.89 352.68 5.49 770.6 28.8
A5 15.69 353.47 5.74 1 003.8 32.0
A7 15.38 356.29 5.48 936.2 34.8
A8 14.71 348.35 5.71 946.6 36.2
A9 16.03 342.04 5.32 1 231.4 54.2
A10 15.42 358.07 5.17 1 155.8 49.6
A11 14.84 355.80 5.35 1 120.6 44.6

Tab.13

Influence of core fiber proportion of roving on yarn quality"

细纱样
品编号		 条干
CVm/%		 断裂强
力/cN		 断裂伸
长率/%		 毛羽/(根·(100 m)-1)
≤2 mm ≥3 mm
A12 14.83 350.42 5.27 1 423.6 64.3
A13 15.03 342.04 5.32 1 231.4 54.2
A14 15.48 341.58 5.21 973.2 49.5

Fig.5

Image of weft knitted fabric with sheath-core spun yarn"

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