Extrusion & Post
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EVOH extrusion pelletizing connected pellets
Fenómeno do problema
During EVOH extrusion pelletizing, pellets are connected and not fully cut, forming a bead-string shape
Análise das causas
EVOH is soft; the knife cuts in during pelletizing but elastic recovery makes the cut surfaces re-bond; pelletizing water temperature too low <40°C without full solidification; cutter speed not matching extrusion speed
Solução
1) Increase pelletizing water temperature to 50-60°C and 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 cutting to reduce connected pellets
Conclusão principal
Connected pellets are caused by elastic recovery and low-temperature pelletizing; high-temperature water cutting and fast cutting are key
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