Extrusion & Post
9 조회수
EEA extrusion die drool and carbon deposits
문제 현상
After EEA extrusion shutdown, brown carbon deposit layer found on the die inner wall, black specks on the product surface after restarting
원인 분석
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
해결 방법
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
핵심 요약
Die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are the key
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