Extrusion & Post
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CEF extrusion die hang-up and carbon deposits
Fenómeno del problema
After CEF extrusion shutdown, brown carbon deposit layer found on the die inner wall, black specks on the product surface when restarting
Análisis de la causa
CEF stays in the die residence area for a long time, heated, oxidized, decomposed and carbonized; die not cleaned in time during shutdown; extrusion temperature too high accelerates carbonization
Solución
1) Flush the die with pure PE for 3-5min before shutdown to remove CEF 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 channels to reduce dead spots in residence areas
Conclusión clave
Die carbon deposits are caused by thermal oxidation and untimely cleaning, PE flushing and timely cleaning are key
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