Processing Machinery
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TPU product stress cracking
Problem Phenomenon
Cracks appear in the product during use.
Cause Analysis
Internal stress and environmental media act together; TPU is sensitive to certain solvents; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
①reduce molding internal stress; ②avoid contact with incompatible media; ③do compatibility verification; ④optimize structural design; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For TPU stress cracking check stress and media; use environment assessment should be done in advance; after confirming effectiveness, fix 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 later
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