Processing Machinery
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PVA internal black speck carbonization
Problem Phenomenon
PVA product interior shows 0.1-0.5mm black specks of carbonized material
Cause Analysis
PVA heated for a long time in barrel dead zones and carbonized; carbon deposit at the screw head; raw material impurities
Solution
1) Lower processing temperature to reduce carbonization; 2) Regularly clean the screw and barrel; 3) Filter raw material to remove impurities
Key Takeaway
Black specks are caused by thermal carbonization and carbon deposit; temperature reduction and regular cleaning are the key
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