Injection Molding
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TPU pockmarks and shrinkage wrinkles
Problem Phenomenon
Pockmark pits or shrinkage wrinkle lines appear on the product surface.
Cause Analysis
Too low injection pressure, overheated material, too low mold temperature, or insufficient feeding; improper gate positioning makes the feeding compensation path unsmooth; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①increase injection pressure; ②reduce barrel temperature; ③increase mold temperature; ④adjust the feeding amount and gate position; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Pockmarks and shrinkage wrinkles are the appearance of imbalanced feeding compensation and temperature management; troubleshoot in the order of pressure, temperature, feeding, and gate; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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