Processing Machinery
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Carbonized Black Specks Inside EVOH
Problem Phenomenon
0.1-0.5mm carbonized black specks appear inside EVOH products
Cause Analysis
EVOH carbonized from prolonged heating in barrel dead zones; carbon deposit at screw head; raw material impurities
Solution
1) Reduce processing temperature to decrease carbonization; 2) Regularly clean screw and barrel; 3) Filter raw material to remove impurities
Key Takeaway
Black specks are caused by thermal carbonization and carbon deposit; cooling and regular cleaning are key
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