Molds & Tooling
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PEEK Weld Line and Confluence Strength
Problembeschreibung
【Problem Phenomenon】The weld line strength of PEEK multi-gate products is insufficient, and pressure tests fail along the weld line
Ursachenanalyse
When melts of semi-crystalline materials converge, the bonding at the crystallization interface is weak; the crystalline morphology in the weld line area differs from the bulk, further reducing strength; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
Change multiple gates to a single gate to eliminate weld lines; when confluence is unavoidable, raise melt temperature and mold temperature to promote fusion; move the weld line out of the stressed area and set an overflow well; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Wichtigste Erkenntnis
PEEK weld lines are eliminated by design; process improvement is only a remedy; 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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