Extrusion & Post
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Material Hang-up and Carbon Deposits on CMC Extrusion Die
Fenómeno del problema
After CMC extrusion shutdown, a brown carbon deposit layer is found on the inner wall of the die, and after restarting, black specks appear on the product surface
Análisis de la causa
CMC is heated for a long time in the die stagnation zone and oxidatively decomposes and carbonizes; the die is not cleaned in time during shutdown; high extrusion temperature accelerates carbonization
Solución
1)Flush the die with pure PE for 3-5min before shutdown to remove CMC residue; 2)Disassemble and clean the die immediately after shutdown; 3)Lower extrusion temperature by 5-10°C to reduce carbonization tendency; 4)Optimize die flow channel to reduce stagnation zone dead corners
Conclusión clave
Die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are the key
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