Effect of melt⁃impregnation process parameters on permeability of fiber bundles

doi:10.19491/j.issn.1001-9278.2022.07.012

Abstract

Abstract:

Permeability is a very important index in the impregnation model of continuous long?fiber?reinforced thermoplastic composites. An accurate measurement for the permeability of fiber bundles impregnated with a high?viscosity resin melt in the melt?impregnation process can help the impregnation model to better guide the design of melt?impregnation molds and the optimization of process parameters for the preparation of thermoplastic resin?based composites with excellent performance. The effects of fiber bundle tension and impregnation pressure variation on the permeation rate during the melt impregnation process with high?viscosity resin impregnating unidirectional fiber bundles were investigated using a homemade experimental setup. A formula for the relationship between the process parameters and permeation rate was fitted according to the experimental results. The results indicated that a greater tension of fiber bundle resulted in lower permeability， but a greater impregnation pressure led to greater permeability of the fiber bundle. Moreover， the increment rate decreased with an increase in tension.

Key words: permeability, impregnation pressure, fiber bundle tension

CLC Number:

TQ327.1

YANG Yifei, WANG Minghuan, LI Jie, HE Yadong, XIN Chunlin, REN Feng. Effect of melt⁃impregnation process parameters on permeability of fiber bundles[J]. China Plastics, 2022, 36(7): 85-92.

Figures/Tables 18

Fig.1. Fiber winding device

Fig.2. Permeability testing device

Fig.3. Device physical diagram

张力/N	气体压力 /MPa
4	0.06
	0.08
	0.10
	0.12
	0.14
	0.16
	0.18
6	0.06
	0.08
	0.10
	0.12
	0.14
	0.16
	0.18
8	0.06
	0.08
	0.10
	0.12
	0.14
	0.16
	0.18

Tab.1. Experimental grouping

Fig.4. Fiber bundle impregnation depth

Fig.5. Sampling position of SEM observation section

张力/N	气体压力/MPa	浸渍深度平均值Z/mm
4	0.06	1.34
	0.08	1.60
	0.10	2.11
	0.12	2.37
	0.14	2.86
	0.16	3.18
	0.18	3.55
6	0.06	0.82
	0.08	1.07
	0.10	1.29
	0.12	1.49
	0.14	1.75
	0.16	1.95
	0.18	2.13
8	0.06	0.58
	0.08	0.77
	0.10	0.82
	0.12	1.00
	0.14	1.17
	0.16	1.34
	0.18	1.46

Tab.2. Average value of immersion depth

Fig.6. Permeability fitting surface

Fig.7. Comparison of the permeability fitting data with the experimental value

Fig.8. The relationship between permeability and fiber bundle tension

Fig.9. Changes in porosity caused by fiber deformation due to pressure and tension

Fig.10. SEM of various positions under different conditions

Fig.11. Porosity at each position under different fiber bundle tensions

Fig.12. Porosity at different locations

Fig.13. Schematic of mold wedge structure

Fig.14. Comparison of the first wedge?shaped area number fitting equation and that of Kozeny?Carman for calculating permeability at different temperature

Fig.15. Comparison of theoretical values and experimental ones of impregnation degree at different temperature

Fig.16. The error between theoretical values from different calculation methods and experimental ones

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