Material Drying
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TPU Extrusion Bubbles
Problem Phenomenon
TPU extruded products have surface bubbling, are not smooth, and transparency decreases
Cause Analysis
During TPU extrusion, moisture vaporizes to form bubbles; uneven melt temperature produces surface defects; extrusion pressure fluctuations make dimensions unstable; insufficient drying is the primary cause of bubbles; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Strictly dry to 0.02% before extrusion; ②uniform control of melt temperature; ③stabilize extrusion pressure to prevent fluctuations; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Bubble management for TPU extrusion is stricter than for '2079851475616104452; the 0.02% red line plus pressure stability is the foundation of surface quality; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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