Establishment of fiber bundle broadening model in melt impregnation mold

doi:10.19491/j.issn.1001-9278.2025.04.009

Abstract

Abstract:

The work done by a fiber bundle in the mold was analyzed for the wavy curved runner impregnation mold， and the fiber bundle broadening model including process and equipment structure parameters was constructed according to the principle of energy conservation. The influence of process and structural parameters on the width of the fiber bundle in the mold was explored by using the wavy curved runner impregnation mold designed in the laboratory. The results indicated that the process parameters generated a great influence on the fiber bundle broadening. Among these parameters， the traction tension was the main influencing factor， and the equipment structure parameters also had an impact on the width expansion to a certain extent. The model can effectively predict the unfolding width of the fiber bundle in the mold impregnation stage， which provides a theoretical basis for controlling and optimizing the fiber bundle broadening process in the mold.

Key words: fiber broadening, melt impregnation, prepreg tape, conservation of energy

CLC Number:

TQ327.1⁺1

MA Chiyuan, XU Wenchong, PAN Yipeng, LIU Yuanyuan, HE Yadong, XIN Chunlin, REN Feng. Establishment of fiber bundle broadening model in melt impregnation mold[J]. China Plastics, 2025, 39(4): 46-51.

Figures/Tables 16

Fig.1. Permeability measurement experimental process and device

Fig.2. Schematic diagram of the structure of the wavy curved runner impregnation mold

Fig.3. Diagram of the state before and after the fiber bundle is broadened

Fig.4. Schematic diagram of the force on the fiber bundle in the mold

Fig.5. Analogy diagram at the fillet of the mold runner

Fig.6. Schematic diagram of the transverse spread of the fiber bundle at the fillet of the flow channel crest

Fig.7. Force analysis of the fiber bundle at the fillet of the flow channel wave

Fig.8. Schematic diagram of the sticky drag force of the fiber bundle in the wedge zone of the mold

Fig.9. Flow diagram of sample preparation for prepreg tape

Fig.10. The width of the fiber bundle in the mold varies with the increase of traction tension

Fig.11. The width of the fiber bundle in the mold varies with the increase of the mold temperature

Fig.12. The width of the fiber bundle in the mold varies with the increase of the mold gap

Fig.13. The width of the fiber bundle in the mold varies with the increase of traction speed

Fig.14. The fiber bundle width in the mold varies with the length of the runner unit

Fig.15. The fiber bundle width in the mold varies with the height of the runner unit

Fig.16. The fiber bundle width in the mold varies with the number of runner elements

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