Material Drying
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TPU First Article Verification
Problem Phenomenon
After material and mold changes, bubbles and performance decline appear in batch production, while the first article only checks appearance
Cause Analysis
TPU is sensitive to moisture content and temperature, and the drying state changes after material change; if the first article does not undergo moisture content and mechanical verification, batch risk goes out of control; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①The first article undergoes three verifications: appearance, dimensions, and moisture content; ②strengthen inspection of the first few shots after material change; ③add impact sampling for critical parts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU first article must include moisture content; qualified appearance does not mean qualified material state; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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