Molds & Tooling
4 조회수
PVC First-Piece Verification
문제 현상
After material and mold change, discoloration and black specks appeared in batches; the first piece was only checked for appearance and dimensions
원인 분석
PVC is sensitive to temperature and residence; stabilizer system differences after material change may alter degradation behavior; without temperature and material state verification on the first piece, batch risk is out of control
해결 방법
①Perform three first-piece verifications: appearance, dimensions, temperature record; ②strengthen inspection of the first few shots after material change; ③compare against color reference samples to prevent gradual change; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
핵심 요약
PVC first-piece verification must include temperature and color; gradual degradation can only be found early by reference sample comparison; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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