Extrusion & Post
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MP extrusion pelletizing connected pellets
Fenómeno do problema
during MP extrusion pelletizing, pellets are connected to each other, not completely cut, forming bead strings
Análise das causas
MP is soft; during pelletizing the knife cuts in but elastic recovery re-bonds the cut surface; pelletizing water temperature too low <40°C, not fully solidified; cutter speed mismatched with extrusion speed
Solução
1) raise 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) replace flat cutting with rotary cutter 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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