Material Drying
5 görüntüleme
Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
Sorun Belirtisi
The color of PBT products changes from white or natural color to yellow or brown.
Neden Analizi
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.
Çözüm
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
Temel Çıkarım
PBT color change is an early warning signal of degradation.
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