Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 30-34.doi: 10.13475/j.fzxb.20200600505

• Fiber Materials • Previous Articles     Next Articles

Numerical simulation of interface distribution of side-by-side bi-component melt in orifice

LIAO He1,2, WANG Jianning3, ZHANG Dongjian2, GAN Xuehui1,2(), ZHANG Yumei3, WANG Huaping3   

  1. 1. Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Shanghai 201620, China
    2. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
  • Received:2020-06-01 Revised:2020-10-08 Online:2021-01-15 Published:2021-01-21
  • Contact: GAN Xuehui E-mail:xuehuig@dhu.edu.cn

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Abstract:

In order to discover the cause for performance instability from interfacial deformation and displacement in side-by-side bi-component fibers, the finite element method was used to simulate the flow of polyethylene terephthalate (PET)/polyamide 6(PA6) polymer melt in the spinneret orifice. According to the results of numerical calculation, the interface changes of parallel flow under different conditions are obtained, and the effects of melt viscosity, inlet flow rate and flow length on the interface position and shape were analyzed. The results show that the interfacial deformation and deviation of the side-by-side bi-component melt occur in the spinneret orifice and that the low-viscosity component tends to wrap the high-viscosity component, whereas the interface change of the melt along the flow direction tends to be stable within a short distance. As the melt viscosity ratio increases, the interface shifts to the low viscosity component and the interface curvature increases. The difference of the inlet flow rate will cause the interface deviation, which will increase with the increase of the flow ratio.

Key words: side-by-side bi-component spinning, interface distribution of melt, polyethylene terephthalate, polyamide 6

CLC Number: 

  • TS151

Fig.1

Schematic diagram of bicomponent side-by-side composite spinning. (a) Spinning channel;(b) Geometry model"

Fig.2

Cross section of side by side simulation"

Fig.3

Shear rate distribution along y direction of cross section"

Fig.4

Viscosity contour of melt in channel"

Fig.5

Interface distribution along flow direction"

Tab.1

Viscosity of bi-component melt"

ηPET/(Pa·s) ηPA6/(Pa·s) ηPA6/ηPET
132 145 1.1
132 198 1.5
132 264 2.0

Fig.6

Interface position distribution with different viscosity ration"

Tab.2

Flow rate of bi-component melt"

QPET/(m3·s-1) QPA6/(m3·s-1) QPET/ QPA6
2×10-8 2×10-8 1.00
2.5×10-8 2×10-8 1.25
3×10-8 2×10-8 1.50

Fig.7

Interface position distribution with different flow rate ratio"

Fig.8

Shear rate distribution along y direction of cross section with different flow rate ratio"

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