Material Drying
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PA66 first-article verification system
Problem Phenomenon
Silver streaks and brittle cracking appear in batches after material and mold changes, and traceability finds that first articles only underwent appearance inspection
Cause Analysis
PA66 is sensitive to moisture content and temperature, and state changes after material and mold changes were not quantitatively verified before mass production, and hidden deviations amplify into batch accidents in volume; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
①First article performs four verifications: moisture content, appearance, dimensions, and impact; ②Re-measure key dimensions after moisture conditioning; ③Mass production only after parameter locking; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 first-article verification must include material state indicators; four verifications plus parameter locking keep accidents out before mass production; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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