Material Drying
4 조회수
Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
문제 현상
The color of PBT products changes from white or natural color to yellow or brown.
원인 분석
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.
해결 방법
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
핵심 요약
PBT color change is an early warning signal of degradation.
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