Injection Molding
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TPU nozzle drool
Problem Phenomenon
During the injection interval, the nozzle drools and drips, and cold material spots appear on the product.
Cause Analysis
Too high melt temperature and low viscosity cause drooling; too high nozzle temperature and excessive back pressure also aggravate dripping; 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 nozzle temperature; ③reduce back pressure; ④adopt an anti-drooling nozzle structure; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Drooling both wastes raw material and introduces cold material defects; temperature and back pressure adjustment combined with an anti-drooling structure can solve it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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