Material Drying
5 조회수
TPU First Article Verification
문제 현상
After material and mold changes, bubbles and performance decline appear in batch production, while the first article only checks appearance
원인 분석
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
해결 방법
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
핵심 요약
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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