Extrusion & Post
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TPU film thickness unevenness
Problem Phenomenon
Large thickness deviation of TPU cast or blown film.
Cause Analysis
Uneven die lip gap or uneven die temperature distribution; the melt elasticity of TPU makes the discharge sensitive to process fluctuations; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①precisely adjust the die lip gap; ②balance the die temperature; ③stabilize the extrusion output; ④online thickness measurement feedback; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The thickness control points of TPU film are similar to those of other elastomer films; die lip precision is the core; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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