Molding Process
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Product surface yellowing
Problem Phenomenon
The product color obviously darkens after processing
Cause Analysis
Processing temperature exceeding 370°C causes thermo-oxidation generating chromophores; material residence time too long accumulating thermal history
Solution
Reduce the melt temperature by 10-20°C to the safe window; reduce residence time; increase antioxidant dosage
Key Takeaway
The yellowing of PES is a direct manifestation of thermo-oxidation
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