Material Drying
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PA6 Dimensional Stability After Conditioning
Problem Phenomenon
After conditioning, PA6 products are found to be obviously larger than in the dry state, confusing the inspection benchmark
Cause Analysis
Conditioning raises PA6 moisture content to the equilibrium state, and dimensional expansion is an inherent material property; the different dimensional benchmarks of dry state and conditioned state cause inconsistent inspection standards; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Clarify the inspection benchmark state: use conditioned-state dimensions as the acceptance benchmark; mark on the drawing that inspection is after conditioning; for dry-state inspection, convert by empirical coefficient and leave sufficient tolerance; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The conditioned state is the real service state of PA6, and the inspection benchmark must be unified; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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