Molds & Tooling
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TPU Flow Mark Jetting
Problembeschreibung
Flow mark streaks centered on the gate appear on the product surface, and cold slugs enter the cavity
Ursachenanalyse
TPU flow mark causes: poor material melting, low mold temperature, low temperature near the gate, gate too small and improperly positioned, short holding pressure time; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Lösung
①Increase melt temperature and back pressure; ②Increase mold and gate area temperature; ③Enlarge the gate and optimize its position; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
TPU flow mark treatment prioritizes temperature; gate design and holding pressure management are supporting means; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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