Processing Machinery
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POM regrind blending performance degradation
Problem Phenomenon
After blending regrind, product brittleness increases, color darkens, and the impact test failure rate rises.
Cause Analysis
Regrind has already degraded after experiencing thermal history, and molecular weight decreases; impurities and carbide may be mixed into the regrind, and the overall performance is diluted and lowered after blending.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Control the regrind blending ratio; ②manage regrind separately to avoid mixing; ③re-dry regrind before use; ④restrict regrind use in critical products.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The thermal degradation cumulative effect of POM regrind is obvious; ratio control and classification management are the bottom line, and regrind should be used cautiously in stressed parts and precision parts.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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