Injection Molding
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Floating Fibers on Glass Fiber Reinforced PEEK
Problem Phenomenon
Glass fiber filamentary texture is visible on the surface of glass fiber reinforced PEEK products, with floating fibers obvious at the far end of the gate and near weld lines, and the defects are magnified after painting or electroplating.
Cause Analysis
The fluidity difference between glass fiber and melt squeezes the fibers toward the surface; when the melt temperature is low and the injection speed too slow, the surface fibers are not covered over; concentrated fiber orientation in high-shear areas aggravates surface enrichment.
Solution
①Raise melt and mold temperatures to enhance the covering ability; ②Speed up injection and use multi-stage injection; ③Optimize the gate position to avoid high-shear areas on the appearance surface; ④Check fiber content and dispersion uniformity.
Key Takeaway
PEEK glass fiber floating is the combined result of fluidity and temperature management; high temperature and high speed are the most effective process means; the fiber orientation direction should be planned at the mold design stage for appearance parts.
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