Extrusion & Post
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Material Hang-up and Carbon Deposits on CMC Extrusion Die
Problem Phenomenon
After CMC extrusion shutdown, a brown carbon deposit layer is found on the inner wall of the die, and after restarting, black specks appear on the product surface
Cause Analysis
CMC is heated for a long time in the die stagnation zone and oxidatively decomposes and carbonizes; 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 CMC residue; 2)Disassemble and clean the die immediately after shutdown; 3)Lower extrusion temperature by 5-10°C to reduce carbonization tendency; 4)Optimize 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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