Extrusion & Post
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Connected Pellets in CMC Extrusion Pelletizing
Problem Phenomenon
During CMC extrusion pelletizing, pellets are connected to each other and not completely cut off, forming a bead-string shape
Cause Analysis
CMC is soft; during pelletizing the cutter cuts in but elastic recovery makes the cut surfaces re-adhere; pelletizing water temperature is low <40°C and not fully solidified; cutter speed does not match extrusion speed
Solution
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)Use rotary cutter instead of flat cutting to reduce connected pellets
Key Takeaway
Connected pellets are caused by elastic recovery and low-temperature pelletizing; high-temperature water cutting and fast cutting are the key
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