Extrusion & Post
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Die deposit and carbon buildup in EVA extrusion
Problem Phenomenon
After EVA extrusion shutdown, brown carbon deposit layer found on die inner wall; after restarting, black specks on product surface
Cause Analysis
EVA oxidatively decomposes and carbonizes under prolonged heating in die stagnation zone; die not cleaned in time during shutdown; extrusion temperature too high accelerating carbonization
Solution
1) Flush die with pure PE for 3-5min before shutdown to remove EVA residue; 2) Disassemble and clean die immediately after shutdown; 3) Lower extrusion temperature by 5-10°C to reduce carbonization tendency; 4) Optimize die flow channel to reduce dead zones in stagnation areas
Key Takeaway
Die carbon buildup is caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are key
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