Processing Machinery
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Product black spots/burnt spots
Problem Phenomenon
Black or dark brown spots appear on the product, accompanied by burnt odor, with local material carbonization
Cause Analysis
Processing temperature >400°C causes PEEK thermal decomposition and carbonization; material stays in the barrel too long (>5min); heater band temperature control accuracy insufficient, producing hot spots
Solution
Strictly control the maximum barrel temperature ≤400°C; shorten the total material residence time to ≤5 minutes; use a PID precise temperature control system (accuracy ±1°C)
Key Takeaway
Once PEEK thermal degradation occurs, it is irreversible and causes permanent damage to the product
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