Extrusion & Post
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EEA extrusion die drool and carbon deposits
Problem Phenomenon
After EEA extrusion shutdown, brown carbon deposit layer found on the die inner wall, black specks on the product surface after restarting
Cause Analysis
EEA heated for a long time in the die residence zone, oxidized, decomposed and carbonized; die not cleaned in time during shutdown; extrusion temperature too high accelerating carbonization
Solution
1) Flush the die with pure PE for 3-5min before shutdown to remove EEA residue; 2) Disassemble and clean the die immediately after shutdown; 3) Reduce extrusion temperature by 5-10°C to reduce carbonization tendency; 4) Optimize die runners to reduce dead zones in the residence zone
Key Takeaway
Die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are the key
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