Material Drying
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PLA First Article Verification
Problem Phenomenon
After material or mold changeover, batches show embrittlement and performance fluctuations, and the first article is only checked for appearance
Cause Analysis
PLA is sensitive to moisture, temperature and residence, and molecular weight and crystallization behavior change after a grade change; the first article does not undergo melt index and mechanical verification, and 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 solely on experience
Solution
①The first article performs three verifications: appearance, dimensions, melt index or mechanical; ②Compare crystallization and shrinkage after a grade change; ③Mass production after parameter locking; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA first article verification must include the material state; the melt index is the rapid quantitative indicator of degradation degree; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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