Processing Machinery
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TPU Shear Degradation
Problem Phenomenon
After TPU screw speed is increased, the product becomes brittle and the color darkens
Cause Analysis
TPU is shear-sensitive; shear heat from high speed causes local overheating and degradation of the melt; 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
Screw speed controlled at medium-low; back pressure 0.2-0.5MPa; actual melt temperature monitoring; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU shear management is more critical than temperature setting; 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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