Material Drying
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PBT First Article Verification
Problem Phenomenon
After material change and mold change, warpage and performance fluctuations appear in batches, and the first article only checks appearance and dimensions
Cause Analysis
PBT is sensitive to drying, temperature, and residence, and shrinkage and warpage behavior changes after changing grades; if the first article does not verify moisture content and warpage, batch risk is out of control; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①The first article performs four verifications: appearance, dimensions, warpage, and moisture content; ②For glass fiber grade material change, do a warpage comparison; ③Mass production after parameter locking; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT first article verification must include warpage and material state; four verifications plus parameter locking prevent batch accidents; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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