Molds & Tooling
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PA66 cooling crystallization control
Problem Phenomenon
PA66 product dimensions continue to change after demolding, still shrinking after 48 hours
Cause Analysis
PA66 crystallinity is high and crystallization rate is affected by cooling; when cooling is uneven, post-crystallization continues, dimensions drift over time; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Mold temperature 80-120℃ ensures sufficient and uniform crystallization; precision-dimension parts conditioned after demolding to accelerate dimensional stabilization; inspection performed in the conditioned state; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Sufficient and uniform crystallization is the premise of dimensional stability, conditioning is the accelerating means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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