Molds & Tooling
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PA6 Crystallization and Cooling Rate
Problem Phenomenon
PA6 products crystallize unevenly after cooling, and dimensions continue to change after storage
Cause Analysis
PA6 is a semi-crystalline material, and the cooling rate determines the crystallinity distribution; when the mold temperature is low and cooling is uneven, the crystallinity difference between the surface layer and the core is large, and post-crystallization causes dimensional post-shrinkage
Solution
Control the cooling rate through a mold temperature of 60-90°C to make crystallization uniform; for products with high dimensional requirements, take the upper mold temperature limit and perform conditioning treatment to release internal stress and stabilize dimensions
Key Takeaway
Crystallization control relies on mold temperature management, and conditioning treatment is the last guarantee of dimensional stability; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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