Extrusion & Post
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TPU Extrusion Surface Waves
Problem Phenomenon
Wave-shaped defects appear on the surface of TPU extruded sheets, with uneven thickness
Cause Analysis
During TPU extrusion, unstable melt flow produces waves; uneven die temperature, haul-off speed fluctuations, and inconsistent cooling all form surface ripples; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Uniform control of die temperature; ②closed-loop stabilization of haul-off speed; ③verification of cooling system uniformity; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU extrusion waves are a mirror of flow stability; the three systems of temperature, haul-off, and cooling work in coordination; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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