Material Drying
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PA moisture absorption causes continuous dimensional changes during storage, requiring environmental control
Fenómeno do problema
PA moisture absorption causes continuous dimensional changes during storage, requiring environmental control
Análise das causas
（1）Polyamide (general-purpose nylon) has strong moisture absorption and continuously absorbs moisture in the storage environment and the size increases
（2）The moisture absorption expansion of dry products in a humid environment can reach 0.5-1.5%
（3）Conditioned products will lose moisture and shrink again in a dry environment
（4）The dimensional change is positively correlated with storage time and environmental humidity
（5）PA12 has a low moisture absorption rate and smaller dimensional change, but it still has an impact
Solução
（1）Condition the products to equilibrium moisture content before use
（2）Control the storage environment humidity to be stable at 50-60%RH
（3）Seal and package precision products for moisture protection
（4）Reserve expansion allowance according to the 1.5-2.5% moisture absorption rate
（5）Low-moisture-absorption varieties PA12/PA410 have more stable dimensions
Conclusão principal
PA storage requires humidity control or moisture conditioning before use
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