Processing Machinery
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LLDPE temperature upper limit
Fenómeno do problema
After raising the temperature to improve plasticization, the product discolors, molecular weight decreases and performance deteriorates.
Análise das causas
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.
Solução
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.
Conclusão principal
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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