Processing Machinery
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PA66 melt temperature effect on molecular weight
Problem Phenomenon
Same grade PA66 produced on different machines, product impact strength differs greatly
Cause Analysis
Actual melt temperature and retention time differ among machines, thermal degradation degree differences make molecular weight decline magnitudes different, strength diverges accordingly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Unify measured melt temperature and retention time control across machines; regularly test product intrinsic viscosity to monitor degradation degree; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Molecular weight monitoring is a deep indicator of batch consistency; 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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