Extrusion & Post
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Die buildup and carbon deposits in EAA extrusion
Problem Phenomenon
After EAA extrusion shutdown, a brown carbon deposit layer is found on the inner wall of the die, and black specks appear on the product surface after restarting
Cause Analysis
EAA is heated for a long time in the die stagnation zone, oxidized, decomposed and carbonized; the die is not cleaned in time during shutdown; high extrusion temperature accelerates carbonization
Solution
1) Flush the die with pure PE for 3-5min before shutdown to remove EAA residue; 2) Disassemble and clean the die immediately after shutdown; 3) Lower the extrusion temperature by 5-10°C to reduce carbonization tendency; 4) Optimize the die flow channel to reduce stagnation zone dead corners
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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