Extrusion & Post
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TPU Extrusion Shear
Problem Phenomenon
The mechanical performance of TPU extruded products is lower than expected
Cause Analysis
Excessive extrusion shear breaks TPU molecular chains and reduces performance; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Low-shear design of the extrusion screw; speed control; actual melt temperature measurement; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
TPU extrusion should follow a low-shear route; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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