Injection Molding
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TPU burrs and flash
Problem Phenomenon
Burrs appear at the parting line and ejector pins, and the cleaning workload is large.
Cause Analysis
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
Solution
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
Key Takeaway
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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