Injection Molding
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Yellowing of PAR '2079851475616104452 due to improper temperature control
Fenómeno do problema
The color of PAR products turns yellow and the transparency decreases.
Análise das causas
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.
Solução
Strictly control the processing temperature at 280-310°C, not exceeding 320°C; shorten the residence time; add antioxidants when necessary.
Conclusão principal
Although PAR has good thermal stability, strict temperature control is still required.
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