Processing Machinery
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PBT product discoloration and yellowing
Problem Phenomenon
Product color yellows.
Cause Analysis
Caused by thermal degradation; stagnant material carbonized in barrel dead corners also brings out yellow spots.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first when troubleshooting
Solution
①Control melt temperature; ②shorten residence time; ③clean barrel dead corners; ④stabilize production rhythm.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Discoloration is a signal of heat management out of control; temperature and machine cleaning are equally important.; after confirming effectiveness, solidify 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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