Extrusion & Post
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EMA Extrusion Die Material Buildup and Carbon Deposits
Problem Phenomenon
After EMA extrusion shutdown, a brown carbon deposit layer is found on the inner wall of the die; after restarting, black specks appear on the product surface
Cause Analysis
EMA stays in the die residence zone for a long time, heated, oxidized, decomposed and carbonized; die not cleaned in time during shutdown; extrusion temperature high, accelerating carbonization
Solution
1) Before shutdown, flush the die with pure PE for 3-5min to remove EMA 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 dead zones in residence areas
Key Takeaway
Die carbon deposits are caused by thermal oxidation and untimely cleaning; PE flushing and timely cleaning are key
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