Molds & Tooling
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Uneven or non-compliant crystallinity of PA products
Problem Phenomenon
The crystallinity of PA products is uneven or does not meet the requirements, and the mechanical properties and dimensional stability are affected
Cause Analysis
（1）Improper mold temperature (deviating from the 60-90°C recommended range) causes large crystallinity fluctuation
（2）The cooling rate is too fast, the crystallinity is low, and the performance is insufficient
（3）The cooling rate is too slow, the crystallinity is too high, and the toughness decreases
（4）The product wall thickness is uneven and the crystallinity of each part differs greatly
（5）Polyamide (general-purpose nylon) crystallizes quickly and requires precise mold temperature control
Solution
（1）Set the mold temperature according to performance requirements: high strength requires a high mold temperature (the higher value of 60-90°C) to promote crystallization
（2）High toughness requires a low mold temperature to suppress crystallization
（3）Ensure uniform mold temperature
（4）Thick-walled products need extended cooling to ensure crystallization is complete
（5）Stabilize the mold temperature to avoid fluctuation
Key Takeaway
PA crystallization requires precise mold temperature control according to performance requirements
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