Injection Molding
11 조회수
Yellowing of PAR '2079851475616104452 due to improper temperature control
문제 현상
The color of PAR products turns yellow and the transparency decreases.
원인 분석
The processing temperature is too high >320°C or the residence time is long, causing thermal oxidative degradation, and the aromatic structure oxidizes and turns yellow.
해결 방법
Strictly control the processing temperature at 280-310°C, not exceeding 320°C; shorten the residence time; add antioxidants when necessary.
핵심 요약
Although PAR has good thermal stability, strict temperature control is still required.
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