Material Drying
6 مشاهدة
Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
ظاهرة المشكلة
The color of PBT products changes from white or natural color to yellow or brown.
تحليل الأسباب
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.
الحل
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
الخلاصة الأساسية
PBT color change is an early warning signal of degradation.
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