Injection Molding
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HDPE injection molded product yellowing
Problem Phenomenon
Natural-colored HDPE parts turn yellow.
Cause Analysis
Excessive melt temperature or too long residence causes degradation; insufficient antioxidant system.
Solution
①Lower melt temperature and shorten residence; ②evaluate antioxidants; ③reduce regrind heat history; ④clean the machine.
Key Takeaway
Yellowing = heat history exceeding the standard.
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