Processing Machinery
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ABS discoloration yellowing
Problem Phenomenon
[Problem Phenomenon] ABS product yellowing and hue drift
Cause Analysis
Melt temperature too high and residence too long causing butadiene oxidation; regrind ratio fluctuation; insufficient color masterbatch temperature resistance; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Measure actual melt temperature and shorten residence; fix regrind; use temperature-resistant color masterbatch; after adjustment, continuously sample to verify the effect, resume mass production only after confirming stability; change only one variable each time and record parameter changes to facilitate locating effective measures
Key Takeaway
For ABS yellowing check heat history, butadiene oxidation is the root; 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 similar problems later
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