Processing Machinery
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Internal black speck carbonization of PU
Problem Phenomenon
0.1-0.5mm black speck carbonized matter appears inside PU products
Cause Analysis
PU carbonized by long-time heating in barrel dead zones; carbon deposits at screw head; raw material impurities
Solution
1) Lower processing temperature to reduce 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 deposits; temperature reduction and regular cleaning are key
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