Material Drying
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PC first article verification process
Fenómeno do problema
After mold and material changeover, silver streaks and cracking appear in batches, and tracing finds first article verification was a mere formality
Análise das causas
PC is sensitive to parameters; after mold and material changeover, changes in drying, temperature, and pressure states are mass-produced without sufficient verification, and hidden deviations are amplified into batch accidents in the batch；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solução
①First article performs four verifications: moisture content, appearance, polarized light stress, and impact; ②Mass production only after parameters are locked; ③Melt index and color comparison for grade change；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PC first article verification must include material state indicators; four verifications plus parameter locking are the institutional guarantee to keep accidents before mass production；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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