Processing Machinery
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TPU product discoloration
Problem Phenomenon
The product color turns yellow or the color difference from the standard sample is large.
Cause Analysis
Thermal degradation causes yellowing; poor masterbatch compatibility or batch differences also cause color difference; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①control processing temperature; ②select compatible masterbatch; ③do color difference testing by batch; ④shorten residence time; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Discoloration must distinguish degradation yellowing from masterbatch problems; temperature management and masterbatch verification are equally important; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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