Processing Machinery
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Nozzle Temperature and Cold Slug of PEEK
Problem Phenomenon
[Problem Phenomenon] Cold slug marks and irregular early filling appear on PEEK products, and a solidified slug can be seen at the nozzle
Cause Analysis
When the nozzle temperature is below the front-zone setting, the melt freezes at the nozzle orifice forming a cold slug; the nozzle must match the front-zone temperature (370-400℃) — a cold nozzle is the direct cause of short shots and cold slug marks
Solution
Set the nozzle's independent temperature control consistent with or slightly higher than the front zone; provide a cold slug well in the mold to receive the front cold material; regularly check the nozzle heater band against aging drift; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Matching the nozzle temperature to the front zone is a hard requirement, and the cold slug well receives the front cold material; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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