Injection Molding 15 visualizações

HDPE injection molded product yellowing

Fenómeno do problema

Natural-colored HDPE parts turn yellow.

Análise das causas

Excessive melt temperature or too long residence causes degradation; insufficient antioxidant system.

Solução

①Lower melt temperature and shorten residence; ②evaluate antioxidants; ③reduce regrind heat history; ④clean the machine.

Conclusão principal

Yellowing = heat history exceeding the standard.

HDPE; yellowing; degradation; melt temperature; antioxidant

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