Material Drying
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TPU Extrusion Pressure Fluctuation
Fenómeno do problema
TPU extrusion pressure suddenly drops, product dimensions fluctuate accordingly, and dimensional stability is poor
Análise das causas
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
Solução
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
Conclusão principal
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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