Molds & Tooling
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PEEK Burning and Trapped Air Black Spots
Problembeschreibung
【Problem Phenomenon】Burnt black spots appear at the ends and rib positions of PEEK products, accompanied by a pungent odor
Ursachenanalyse
Air trapped in the cavity is adiabatically compressed under high pressure and heats up, burning the melt; the PEEK processing temperature is already close to the material limit, so the temperature rise of trapped air more easily breaks through the degradation threshold; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
Strengthen venting at ends and rib positions and control the depth at 0.02-0.025mm; reduce the injection speed in the final stage; adjust the gate in the trapped air area to change the confluence position
Wichtigste Erkenntnis
For high-temperature materials, trapped air means burning; venting and final-stage speed reduction are double insurance; after confirming effectiveness, fix 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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