Processing Machinery
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ASA Discoloration Hue Drift
Problem Phenomenon
【Problem Phenomenon】ASA products turn yellow and dark, batch-to-batch color difference unstable
Cause Analysis
Excessive melt temperature, excessive residence, regrind ratio fluctuation and insufficient color masterbatch temperature resistance can all cause discoloration; ASA weather resistance advantage depends on undegraded matrix; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Actually measure melt temperature and residence time; fix regrind ratio; color masterbatch choose temperature-resistant UV-stable type; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
ASA discoloration check thermal history and color masterbatch, matrix degradation ruins weather resistance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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