Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (03): 39-44.doi: 10.13475/j.fzxb.20190304207

• Textile Engineering • Previous Articles     Next Articles

Simulation and analysis of trajectory of fibers in a four-roller compact spinning system

QIAN Cheng, LIU Yanqing(), LIU Xinjin, XIE Chunping, SU Xuzhong   

  1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2019-03-13 Revised:2019-11-07 Online:2020-03-15 Published:2020-03-27
  • Contact: LIU Yanqing E-mail:yqljndx@126.com

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Abstract:

In order to simulate the trajectory of fibers in four-roller compact spinning, the critical components of four-roller compact spinning were measured to build a physical model. Fluent16 which can calculate the flow field was used to acquire the airflow distribution in the aggregation region. The dynamic model of fiber was established by infinitesimal method, and MatLab was used to edit the dynamic equation to simulate the trajectory of a single fiber under different conditions. The results show that the fibers at the entrance of aggregation region are compacted and output to the center. The track of single fiber is regular, but the displacement of the fiber in the intermediate micro-element period is random. The fibers hold together under the action of airflow force and friction. With the increase of the negative pressure value, the fibers hold together more tightly; but when the negative pressure is too high, the internal and external transfer of fibers is weakened, thus weakening the cohesive force among the fibers.

Key words: four-roller spinning system, compact spinning, dynamic model, movement of fibers

CLC Number: 

  • TS101.2

Fig.1

Four-roller spinning drafting system"

Fig.2

Boundary condition setting"

Fig.3

Flow speed vector illustration of compact area. (a)Inlet surface of suction sunken;(b)Profile of suction sunken"

Fig.4

Distribution of three-dimensional differential velocity in aggregation region. (a)Plan view;(b)Bottom view"

Fig.5

Force analysis of fiber element segment"

Tab.1

Calculating parameter of dynamical model"

纤维直径d/mm 0.022
空气密度ρa(25 ℃)/(kg·m-3) 1.165
纤维密度ρf/(g·cm-3) 1.54
流场修正系数k 0.2
纤维间的摩擦因数μ 0.2
空气黏度μa(25 ℃)/(m2·s-1) 16×10-6
时间间隔数 1 000
圆弧半径r/mm 18

Fig.6

Trajectories of fibers observed at different angles. (a)Fiber movement in aggregation region;(b)Fiber movement at feeding point;(c)Fiber movement of XZ axis section in aggregation region;(d)Single fiber movement"

Fig.7

Surface structure of different yarns (×100)"

Tab.2

Test result of yarn hairiness"

编号 负压值/Pa 气流速度/(m·s-1) 3 mm以下毛羽个数(200 m)
1 -2 800 68.9 10 323
2 -3 100 72.5 9 928
3 -3 400 75.9 9 625
4 -3 800 80.3 9 824

Fig.8

Trajectory of fibers in aggregation region. (a)Fiber motion in XY axis profile;(b)Fiber motion in YZ axis profile"

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