Material Drying
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PC drying temperature upper limit 120℃
Problem Phenomenon
Pellets turn yellow and agglomerate after drying, and products turn yellow and brittle after '2079851475616104452
Cause Analysis
When drying temperature exceeds 120℃ or stays at high temperature for a long time, the surface of PC pellets oxidizes and yellows and partially sticks together; local overheating in hot air circulation drying also causes color difference and pre-degradation
Solution
①Drying temperature controlled in the 110-120℃ range; ②Optical-grade parts use dehumidifying drying instead of ordinary hot air; ③Drying time does not exceed 6 hours to avoid long-term heat exposure
Key Takeaway
PC drying requires both sufficient temperature to dehydrate and no overheating oxidation; 110-120℃ is the standard window balancing efficiency and safety；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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