Extrusion & Post
8 views
EVOH extrusion pelletizing connected pellets
Problem Phenomenon
During EVOH extrusion pelletizing, pellets are connected and not fully cut, forming a bead-string shape
Cause Analysis
EVOH is soft; the knife cuts in during pelletizing but elastic recovery makes the cut surfaces re-bond; pelletizing water temperature too low <40°C without full solidification; cutter speed not matching 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) Rotary cutter replacing 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 key
Was this helpful?
0 people found this helpful
Thank you for your feedback!