Processing Machinery
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Product black spots
Problem Phenomenon
Black burnt spots appear on the product
Cause Analysis
Processing temperature >390°C, local degradation and carbonization; material residence time in the barrel exceeds the limit; accumulated material in equipment dead corners carbonizes and falls off
Solution
Strictly control temperature ≤370°C; shorten material residence to <5min; regularly disassemble and clean the screw and barrel
Key Takeaway
Black spots reflect local thermal degradation of PES
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