Molds & Tooling
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TPU Flow Mark Jetting
Fenómeno do problema
Flow mark streaks centered on the gate appear on the product surface, and cold slugs enter the cavity
Análise das causas
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
Solução
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
Conclusão principal
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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