Material Drying
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PA66 dimensional out-of-tolerance
Problem Phenomenon
PA66 precision part dimensions are sometimes large and sometimes small, inconsistent between different batches of the same mold
Cause Analysis
Shrinkage is affected by multiple factors of mold temperature, holding pressure, and material moisture content, and any fluctuation causes dimensional drift; PA66 shrinkage rate of 1.5-2% is inherently sensitive; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Lock key parameters such as mold temperature and holding pressure; test material moisture content batch by batch; inspect dimensions in conditioned state; SPC monitoring of key dimensions; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Dimensional consistency relies on parameter locking plus SPC monitoring; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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