Molds & Tooling
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TPU nozzle drooling management
Problem Phenomenon
Nozzle drooling and stringing contaminate the mold surface, and melt dripping during the mold opening gap forms specks
Cause Analysis
TPU melt viscosity is relatively low, and drooling occurs when the nozzle temperature is high or the back pressure is large; insufficient suck-back stroke also aggravates dripping; the nozzle design needs to be anti-drooling; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①appropriately reduce nozzle temperature; ②adjust back pressure to prevent drooling; ③increase suck-back stroke or switch to an anti-drooling nozzle; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU drooling treatment starts from the three lines of temperature, back pressure, and suck-back; the anti-drooling nozzle is the radical solution for high-end parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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