Material Drying
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TPU Bubble Cause Distinction
Problem Phenomenon
TPU product bubbles repeatedly appear and persist even after strengthened drying
Cause Analysis
TPU bubble causes: moisture, degradation, and air entrapment—three routes; treating only drying cannot cure the root cause; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Empty-shot identification: for moisture bubbles check drying, for degradation bubbles check temperature and shear, for air entrapment check back pressure and venting; 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
TPU bubbles are identified by the three routes before treatment; 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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