Extrusion & Post
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TPU product paint peeling
Problem Phenomenon
Poor paint film adhesion after coating.
Cause Analysis
Surface release agent or exudates hinder adhesion; TPU elastic deformation also cracks the paint film; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①clean the surface before coating; ②select elastic paint systems; ③control the use of release agent; ④do adhesion testing; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU coating requires a clean surface and matching paint type; elastic substrates need flexible coatings; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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