Material Drying
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PPS First Article Verification
Problembeschreibung
After material and mold changes, warpage and discoloration appear in batches, while the first article only checked appearance and dimensions
Ursachenanalyse
PPS is sensitive to temperature, mold temperature, and drying; crystallization and shrinkage behavior change after grade changes; without warpage and melt index verification on the first article, batch risk goes out of control; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Lösung
①The first article performs four verifications: appearance, dimensions, warpage, melt index; ②Conduct shrinkage comparison after grade change; ③Mass production after parameters are locked; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PPS first article verification must include warpage and melt index; four verifications plus parameter locking prevent batch accidents; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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