Injection Molding
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TPU burrs and flash
Problembeschreibung
Burrs appear at the parting line and ejector pins, and the cleaning workload is large.
Ursachenanalyse
Overheated material reduces viscosity and easily penetrates gaps; too high injection pressure or low mold clamping pressure allows the high-pressure melt to push open the parting line forming burrs; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
①reduce barrel temperature; ②reduce injection pressure; ③increase clamping fastening pressure; ④repair the fitting precision of the parting line; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
TPU low-viscosity melt is sensitive to parting line precision; dual reduction of temperature and pressure usually takes effect quickly; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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