Molds & Tooling
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TPU Nozzle Leakage
Problem Phenomenon
TPU nozzle leaks and contaminates the mold
Cause Analysis
Poor nozzle sealing or high residual pressure; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Nozzle seal inspection; screw retraction to release pressure; nozzle contact pressure adjustment; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For leakage, check sealing and residual pressure; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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