Injection Molding
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Long glass fiber poor impregnation causing dispersion difficulty
Problem Phenomenon
During pelletizing or injection, glass fiber bundles cannot be fully impregnated and dispersed by the PP melt
Cause Analysis
The melt viscosity of PP is high, making it difficult to penetrate into the fiber bundle; the polarity difference between the fiber surface and PP is large, with a wetting angle >90°; the processing time is insufficient to complete impregnation
Solution
Increase the processing temperature to reduce PP viscosity; pre-impregnate the glass fiber (use low molecular weight PP impregnating agent); optimize the screw design by adding an impregnation section
Key Takeaway
Full impregnation of fibers is the prerequisite for exerting the reinforcement effect
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