Molds & Tooling
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PA66 post-crystallization dimensional drift
Problem Phenomenon
Dimensions continue to change after low-mold-temperature molding, precision parts out of tolerance.
Cause Analysis
Insufficient crystallinity at low mold temperature, continued crystallization after demolding; environmental temperature and humidity participate; post-crystallization is an aging characteristic; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Mold temperature 80~100℃ to lock crystallization; ②extend cooling time so products are fully set before demolding; ③uniformly specify measurement aging (e.g., 24 hours after molding); ④perform annealing when necessary to eliminate residual stress; ⑤stabilize the environment.
Key Takeaway
PA66 post-crystallization='insufficient mold temperature': raising mold temperature to lock crystallization is fundamental; manage dimensions after aging, especially guard against low-mold-temperature parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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