Processing Machinery
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PCABS Discoloration and Yellowing
Problembeschreibung
[Problem Phenomenon] PC/ABS products yellow with hue drift, and batches are unstable
Ursachenanalyse
Excessive melt temperature and excessive residence time degrade the PC phase; regrind ratio fluctuates; color masterbatch has insufficient temperature resistance; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
Measure actual melt temperature and shorten residence time; fix the regrind ratio; select temperature-resistant color masterbatch; 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
Wichtigste Erkenntnis
For PC/ABS yellowing, check thermal history first, then regrind and color masterbatch; 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 in the future
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