Extrusion & Post
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MP extrusion die buildup carbon deposits
Problem Phenomenon
after MP extrusion shutdown, brown carbon deposit layer found on the die inner wall; after restart, black specks on the product surface
Cause Analysis
MP in the die stagnation zone heated for a long time, oxidatively decomposed and carbonized; die not cleaned in time at shutdown; extrusion temperature high accelerating carbonization
Solution
1) flush the die with pure PE for 3-5min before shutdown to remove MP residue; 2) disassemble and clean the die immediately after shutdown; 3) reduce extrusion temperature 5-10°C to reduce carbonization tendency; 4) optimize the die flow channel to reduce dead spots in stagnation zones
Key Takeaway
die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are key
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