Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 41-46.doi: 10.13475/j.fzxb.20210803207

• Textile Engineering • Previous Articles     Next Articles

Residual twist of core yarn and its application in hollow spindle cover spinning

AO Limin1(), LOU Huan2, TANG Wen3   

  1. 1. College of Materials and Textile Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
    2. School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai 201620, China
    3. College of Business, Jiaxing University, Jiaxing, Zhejiang 314001, China
  • Received:2021-08-04 Revised:2021-11-11 Online:2022-07-15 Published:2022-07-29

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Abstract:

In order to explore the characteristics and application of the false twist effect of the outer wrapping yarn on the core yarn in hollow spindle cover spinning process, covered yarns of different processes were produced with black and white polyester filament yarns as the double core yarn, and the black polyester filament yarn being the outer wrapping yarn. The influence of twist direction and twist number characteristics of core yarn as well as the spindle speed, yarn take-up speed and core yarn tension on core yarn residual twist were analyzed. The principle spinning segment color yarn with core yarn residual twist and the characteristics of segment color were discussed with exemplified applications. The results show that the false twist effect of the outer wrapping yarn on the core yarn causes the residual twist to be unevenly distributed in the core yarn. The twist number of the residual twist increases with the rise in the spindle speed, the slowing down of the take-up speed and reduction of the core yarn tension. Using the "fragment coloring" effect of the core yarn residual twist, the "yarn/yarn" composite segment color yarn with a segment color appearance can be spun from the different color core yarns, and the composite yarn has the characteristic of "flashing color" which is different from the conventional segment colored yarns.

Key words: hollow spindle cover spinning, core yarn, false twist effect, residual twist, segment colored yarns

CLC Number: 

  • TS104.1

Fig.1

Principle doubling for different color yarns—twisting to color separation—wrapping—segment coloring. (a) Same color wrapping (take B color as an example); (b) Different color wrapping"

Fig.2

Spinning principle"

Fig.3

"(White + black) white" composite yarn card"

Tab.1

Test results of black color segment of composite yarn with different spindle speeds"

锭速/(r·min-1) 包缠捻度/(捻·m-1) 黑色段数量
均值/个 CV值/%
15 000 600 8.0 1.9
12 500 500 6.2 1.6
9 275 375 5.0 1.2
7 500 300 3.4 1.2

Tab.2

Test results of black color segment of composite yarn with different yarn take-up speeds"

引纱速度/(m·min-1) 包缠捻度/(捻·m-1) 黑色段数量
均值/个 CV值/%
50 300 5.5 1.8
30 500 8.0 1.9
25 600 8.0 1.9
20 750 9.1 1.8

Tab.3

Test results of black color segment of composite yarn with different core yarn tensions"

芯纱张力 黑色段数量
均值/个 CV值/%
张力1 8.0 1.9
张力2 6.7 2.2
张力3 5.4 1.4
张力4 4.4 1.3

Fig.4

Silk segment color composite yarn card"

Fig.5

Linen/polyester filament composite segment colored yarn card"

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