Processing Machinery
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LLDPE temperature upper limit
Problembeschreibung
After raising the temperature to improve plasticization, the product discolors, molecular weight decreases and performance deteriorates.
Ursachenanalyse
Although LLDPE has good thermal stability, long-term high temperature still causes thermal oxidative degradation; degradation accelerates above 280℃; narrow MWD grades are more temperature-sensitive; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Lösung
①Control the processing temperature below 280℃; ②avoid long-time high-temperature residence; ③immediately lower the temperature and purge when discoloration occurs; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Wichtigste Erkenntnis
LLDPE's temperature upper limit also exists; the 280℃ red line plus residence management prevents oxidative degradation; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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