Material Drying
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Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
Fenómeno do problema
The color of PBT products changes from white or natural color to yellow or brown.
Análise das causas
The processing temperature is too high or the residence time is too long, causing thermal oxidative degradation; insufficient drying of the raw material causes hydrolytic degradation; the regrind ratio is too high.
Solução
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
Conclusão principal
PBT color change is an early warning signal of degradation.
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