Extrusion & Post
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Pellet Sticking in PU Extrusion Pelletizing
Problembeschreibung
During PU extrusion pelletizing, pellets stick together, not fully cut, forming bead strings
Ursachenanalyse
PU is soft, the cutter cuts in during pelletizing but elastic recovery makes the cut faces re-bond; pelletizing water temperature too low <40°C, not fully solidified; cutter speed mismatched with 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 pellet sticking
Wichtigste Erkenntnis
Pellet sticking is caused by elastic recovery and low-temperature pelletizing; high-temperature water cutting and fast cutting are key
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