Material Drying
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TPU Extrusion Pressure Fluctuation
Problem Phenomenon
TPU extrusion pressure suddenly drops, product dimensions fluctuate accordingly, and dimensional stability is poor
Cause Analysis
TPU extrusion pressure normally decreases as temperature rises; but when moisture exceeds the standard, the pressure drops too fast; the rate of pressure change can serve as an indirect indicator of moisture content; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Monitor the rate of extrusion pressure change; ②when pressure drops abnormally, check moisture content first; ③stabilize temperature to ensure the pressure baseline; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU extrusion pressure is a live detection of moisture; for abnormal fluctuations, check drying first, then check others; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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