Processing Machinery
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TPU Watch Strap
Problem Phenomenon
TPU watch straps whiten and crack after contacting sweat
Cause Analysis
Sweat and cleaning agent erosion plus bending stress cause surface cracking; 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
Choose sweat-resistant and corrosion-resistant grades; structure reduces stress; clean regularly; 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
Watch straps are selected with corrosion-resistant grades according to the sweat environment; 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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