Injection Molding
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Yellowing in PCTG '2079851475616104452
Problem Phenomenon
The product color changes from transparent to yellow.
Cause Analysis
The processing temperature is too high, causing thermal degradation, the residence time is too long, the raw material is insufficiently dried, and too much regrind is used.
Solution
Control the temperature ≤250°C; shorten the residence time; fully dry; control the regrind ≤25%.
Key Takeaway
PCTG yellowing is a signal of degradation.
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