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