Processing Machinery
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Poor Color Powder Dispersion in High-Mixing PEEK
Problem Phenomenon
Colored PEEK products show color spots, color streaks, and color difference; color powder agglomeration is clearly visible, and increasing back pressure brings limited improvement while increasing degradation risk.
Cause Analysis
PEEK melt has high viscosity and a narrow processing window, making color powder wetting and dispersion difficult; when the screw mixing elements shear insufficiently, the color powder agglomerates; excessively increasing shear in turn triggers thermal degradation and fiber damage.
Solution
①Select PEEK-specific high-temperature color masterbatch granules to replace color powder; ②Match the melt index of the color masterbatch carrier to the base material; ③Moderately increase back pressure and melt temperature to improve dispersion; ④Replace with a screw with stronger mixing capability if still not up to standard.
Key Takeaway
For PEEK coloring, the dedicated color masterbatch granule route is preferred; directly adding color powder to a narrow-window material is high risk; the balance point between dispersion and degradation needs to be determined by testing.
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