Material Analysis
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Filling Speed and Shear Darkening of PEEK
Problem Phenomenon
[Problem Phenomenon] PEEK thin-wall parts freeze and short-shot when filling is slow, and the melt shears, darkens, and discolors when filling is fast
Cause Analysis
A filling time of 1-3 seconds is the conventional target: too slow and the front freezes into a short shot, too fast and shear heating darkens the melt; products below 150 grams are especially sensitive; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind adjustment based solely on experience
Solution
Adjust the filling time toward the 1-3 second target; for thin-wall short shots, prioritize raising mold temperature and nozzle temperature; for shear darkening, reduce speed and check whether the gate size is too narrow; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
1-3 second filling is the rhythm benchmark of PEEK — check one end each for short shot and darkening; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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