Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (07): 35-39.doi: 10.13475/j.fzxb.20191105505

• Textile Engineering • Previous Articles     Next Articles

Effect of taker-in speeds on variation and redistribution of nep

CAO Jipeng1,2(), ZHANG Mingguang1,2, YU Xuezhi1,2   

  1. 1. School of Clothing & Textile, Eastern Liaoning University, Dandong, Liaoning 118003, China;
    2. Liaoning Key Laboratory of Functional Textile Materials, Eastern Liaoning University, Dandong, Liaoning 118003, China
  • Received:2019-11-25 Revised:2020-04-09 Online:2020-07-15 Published:2020-07-23

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Abstract:

In order to remove nep effectively in carding so as to improve carding and yarn quality, the cotton fibers were carded at 4 taker-in speeds, the content and size of nep in card sliver, taker-in droppings, flat strips and cylinder screen droppings were tested using USTER AFIS tester. Results show that total neps are reduced by 20.58%-26.7% after laps are carded; the neps in cotton lap are carded and redistributed in card sliver, taker-in droppings, flat strips and cylinder screen droppings, and nep percentage in card sliver is the highest, at about 90%, followed by that in flat strips, that in taker-in droppings and that in cylinder screen droppings; comparing with the average size of total neps in cotton lap, that in card sliver is decreased by 13.1%-14.2%, while that in taker-in droppings and that in flat strips are increased by 12.6%-19.2% and 8.4%-10.3%, respectively, and that in cylinder screen droppings is reduced by 2.6%-4.6%; nep content of card sliver has a tendency to decrease with the increase of taker-in speed.

Key words: cotton card, taker-in, nep, card sliver, flat strip

CLC Number: 

  • TS104.2

Tab.1

AFIS test results of materials used in experiment"

纤维质量
平均长度/
mm		 纤维根数
平均长度/
mm		 5.0%根数
长度/mm		 根数短绒率
(<16 mm)/%		 棉结总数/
(粒·g-1)		 棉结尺寸/
μm		 带籽屑
棉结含量/
(粒·g-1)		 带籽屑
棉结尺寸/
μm		 粒杂含量/
(粒·g-1)		 尘杂含量/
(粒·g-1)		 可见
异物率/
%
25.7 21.7 34.3 25.9 225 675 4 1 136 31 142 0.69

Tab.2

Redistribution of total neps and SCNs in carding process under different taker-in speeds"

刺辊速度/
(r·min-1)		 试样
名称		 试样质量/
kg		 棉结含量/
(粒·g-1)		 棉结
总数/粒		 棉卷经过
梳理后棉结
占比/%		 带籽屑棉
结含量/
(粒·g-1)		 带籽屑
棉结总数/
粒		 棉卷经过梳理后
带籽屑棉结
占比/%
棉卷 26.000 310 8 060 000 — 4 104 000 —
生条 25.041 228 5 709 348 90.17 1 25 041 23.21
800 盖板花 0.585 752 439 920 6.95 94 54 990 50.97
刺辊落棉 0.307 441 135 387 2.14 89 27 323 25.32
锡林漏底落棉 0.067 698 46 766 0.74 8 536 0.50
棉卷 25.700 310 7 967 000 — 4 102 800 —
生条 24.574 227 5 578 298 88.16 2 49 148 32.72
1 000 盖板花 0.601 796 478 396 7.56 84 50 484 33.61
刺辊落棉 0.451 479 216 029 3.41 111 50 061 33.33
锡林漏底落棉 0.074 737 54 538 0.86 7 518 0.34
棉卷 25.330 310 7 852 300 — 4 101 320 —
生条 23.997 224 5375328 87.17 1 23997 21.80
1 200 盖板花 0.578 779 450 262 7.30 87 50 286 45.68
刺辊落棉 0.657 421 276 597 4.49 53 34 821 31.63
锡林漏底落棉 0.098 656 64 288 1.04 10 980 0.89
棉卷 25.525 310 7 912 750 — 4 102 100 —
生条 24.005 206 4 945 030 85.26 2 48 010 33.18
1 400 盖板花 0.578 773 446 794 7.70 91 52 598 36.35
刺辊落棉 0.865 408 352 920 6.08 50 43 250 29.89
锡林漏底落棉 0.077 720 55 440 0.96 11 847 0.59

Tab.3

Average size of total neps and SCNs in card sliver and several droppings under different taker-in speeds"

刺辊速度/
(r·min-1)		 棉卷 生条 盖板花 刺辊落棉 锡林漏底落棉
总棉结
尺寸/μm		 带籽
屑棉结
尺寸/μm		 总棉结
尺寸/μm		 带籽
屑棉结
尺寸/μm		 总棉结
尺寸/μm		 带籽
屑棉结
尺寸/μm		 总棉结
尺寸/μm		 带籽
屑棉结
尺寸/μm		 总棉结
尺寸/μm		 带籽
屑棉结
尺寸/μm
800 681 1 078 590 761 751 1 151 795 1 035 657 765
1 000 681 1 078 592 747 744 1 204 812 1 127 654 842
1 200 681 1 078 590 782 738 1 138 772 1 053 650 859
1 400 681 1 078 584 761 746 1 149 767 1 058 663 889

Tab.4

Content of total neps under different taker-in speeds"

刺辊速度/
(r·min-1)		 棉结/(粒·g-1)
棉卷 生条 盖板花 刺辊
落棉		 锡林漏
底落棉
800 228 752 441 698
1 000 310 227 796 479 737
1 200 224 779 421 656
1 400 206 773 408 720

Tab.5

Content of SCNs under different taker-in speeds"

刺辊速度/
(r·min-1)		 带籽屑棉结/(粒·g-1)
棉卷 生条 盖板花 刺辊
落棉		 锡林漏底
落棉
800 1 94 89 8
1 000 4 2 84 111 7
1 200 1 87 53 10
1 400 2 91 50 11
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