Extrusion & Post
14 visualizaciones
MP extrusion die buildup carbon deposits
Fenómeno del problema
after MP extrusion shutdown, brown carbon deposit layer found on the die inner wall; after restart, black specks on the product surface
Análisis de la causa
MP in the die stagnation zone heated for a long time, oxidatively decomposed and carbonized; die not cleaned in time at shutdown; extrusion temperature high accelerating carbonization
Solución
1) flush the die with pure PE for 3-5min before shutdown to remove MP residue; 2) disassemble and clean the die immediately after shutdown; 3) reduce extrusion temperature 5-10°C to reduce carbonization tendency; 4) optimize the die flow channel to reduce dead spots in stagnation zones
Conclusión clave
die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are key
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!