Injection Molding
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TPU under-injection short shot
Problem Phenomenon
The product is not completely filled, and material is missing at the end.
Cause Analysis
Insufficient feeding, premature solidification, too low barrel temperature, or too low injection pressure; the high viscosity of TPU makes filling of thin walls and long flow paths more difficult; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①adjust the feeding amount; ②increase mold temperature to delay solidification; ③increase barrel temperature; ④increase injection pressure; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU short shot is troubleshooted along the three routes of feeding, temperature, and pressure; high-viscosity grades require higher filling energy; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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