Extrusion & Post
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Connected pellets in EVA extrusion pelletizing
Fenómeno del problema
During EVA extrusion pelletizing, pellets are connected and not fully cut, forming bead strings
Análisis de la causa
EVA is soft; during pelletizing the knife cuts in but elastic recovery makes cut surfaces re-adhere; pelletizing water temperature too low <40°C without full solidification; cutter speed not matching extrusion speed
Solución
1) Increase pelletizing water temperature to 50-60°C to 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 replacing flat cutter 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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