Extrusion & Post
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Discoloration of PC Products After Annealing Heat Treatment
Problem Phenomenon
Local yellowing of PC products occurs after annealing treatment at 120-130°C.
Cause Analysis
The annealing temperature is too high or the time is too long, causing thermal oxidation; the oxygen content of the annealing furnace is high.
Solution
Control the annealing temperature ≤120°C; anneal under nitrogen protection; shorten the time.
Key Takeaway
PC annealing requires oxidation control to prevent discoloration.
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