Extrusion & Post
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Connected pellets in PVA extrusion pelletizing
Problembeschreibung
During PVA extrusion pelletizing, pellets are connected, not completely cut, forming a bead-string shape
Ursachenanalyse
PVA is soft, the knife cuts in during pelletizing but elastic recovery makes the cut surfaces re-adhere; pelletizing water temperature too low <40°C, not fully solidified; cutter speed does not match extrusion speed
Lösung
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 replacing flat cutting to reduce connected pellets
Wichtigste Erkenntnis
Connected pellets are caused by elastic recovery and low-temperature pelletizing; high-temperature water cutting and fast cutting are key
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