Material Drying
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TPU Hydrolysis Aging
Problem Phenomenon
Polyester-type TPU products crack after one year in a hot and humid environment
Cause Analysis
Polyester-type TPU has poor hydrolysis resistance; in hot and humid environments, ester bonds hydrolyze and molecular weight decreases; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Choose polyether-type TPU for hot and humid environments; store products protected from heat and humidity; verify according to aging standards; 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
Polyether-type TPU is a must for hot and humid environments; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems later
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