Extrusion & Post
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CEF extrusion pelletizing connected pellets
Fenómeno del problema
During CEF extrusion pelletizing, pellets are connected, not completely cut, forming a bead-string shape
Análisis de la causa
CEF is soft, the cutter cuts in during pelletizing but elastic recovery makes the cut surfaces re-bond; pelletizing water temperature low <40°C, not fully solidified; cutter speed not matched with extrusion speed
Solución
1) Increase pelletizing water temperature to 50-60°C, cut after full solidification; 2) Increase cutter speed to ensure fast cutting; 3) Cutter gap 0.01-0.02mm to ensure clean cutting; 4) Rotary cutter instead of flat cutting to reduce connected pellets
Conclusión clave
Connected pellets are caused by elastic recovery and low-temperature pelletizing, high-temperature water cutting and fast cutting are key
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