Extrusion & Post
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Die buildup and carbon deposits in EAA extrusion
Fenómeno del problema
After EAA extrusion shutdown, a brown carbon deposit layer is found on the inner wall of the die, and black specks appear on the product surface after restarting
Análisis de la causa
EAA is heated for a long time in the die stagnation zone, oxidized, decomposed and carbonized; 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 EAA 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 the 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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