Material Drying
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The dry-state PA impact strength is low and conditioning toughening is required
Problem Phenomenon
The dry-state PA impact strength is low and conditioning toughening is required
Cause Analysis
In the dry state of polyamide 410 (bio-based long carbon chain nylon), the moisture content is low, the plasticizing effect of water molecules is missing, and the impact strength is only 1/3-1/2 of that in the wet state
The moisture content of products just after demolding is extremely low, and the brittleness is extremely high
The dry-state brittleness is more severe in low-temperature environments
Thin-walled products have a higher risk of dry-state brittle fracture
Rapid demolding followed by external force causes immediate brittle fracture
Solution
Perform conditioning treatment after demolding to bring the moisture content to 1.5-2.5%
Avoid applying force and impact to products just after demolding
Special conditioning is required for use in low-temperature environments
Extend the conditioning time for thin-walled products
Avoid dry-state stress during transportation and storage
Key Takeaway
PA dry-state brittleness requires conditioning treatment before use
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