Extrusion & Post
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POE extrusion die material buildup carbon deposit
Fenómeno do problema
After POE extrusion shutdown, a brown carbon deposit layer was found on the inner wall of the die, and after restarting, black specks appeared on the product surface
Análise das causas
POE in the die residence zone is heated for a long time, oxidatively decomposes and carbonizes; the die was not cleaned in time during shutdown; extrusion temperature too high accelerates carbonization
Solução
1) Before shutdown, flush the die with pure PE for 3-5min to remove POE residue; 2) Disassemble and clean the die immediately after shutdown; 3) Lower the extrusion temperature by 5-10°C to reduce carbonization tendency; 4) Optimize die flow channel to reduce residence zone dead corners
Conclusão principal
Die carbon deposit is caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are key
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