Extrusion & Post
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DSTDP extrusion pelletizing connected pellets
Fenómeno do problema
During DSTDP extrusion pelletizing, pellets are connected and not completely cut off, forming a bead-string shape
Análise das causas
DSTDP is soft, the knife cuts in during pelletizing but elastic recovery makes the cut faces re-bond; pelletizing water temperature on the low side <40°C, not fully solidified; cutter speed not matched with extrusion speed
Solução
1) Raise pelletizing water temperature to 50-60°C, cut after fully solidified; 2) increase cutter speed to ensure fast cutting; 3) cutter gap 0.01-0.02mm to ensure clean cutting; 4) rotary cutter instead of flat cut 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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