Material Drying
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High Brittleness of PA Products Just After Demolding or in Dry State
Problem Phenomenon
PA products are very brittle just after demolding or in the dry state, the impact strength is far lower than in the wet state, and brittle fracture easily occurs
Cause Analysis
In the dry state of polyamide 410 (bio-based long carbon chain nylon), the hydrogen bonds between molecular chains are highly rigid and lack water molecule plasticization
Excessive drying and too low moisture content
Used directly after demolding without conditioning
The product wall thickness is thin, the rigidity is low, and the brittleness is more obvious
Dry-state embrittlement is aggravated in low-temperature environments
Solution
Perform conditioning treatment after demolding (bring the moisture content to 1.5-2.5% in water or a hot and humid environment)
Avoid excessive drying and maintain reasonable moisture content
Avoid applying force to products just after demolding
Thin-walled products need extended conditioning time
Avoid using dry-state products in low-temperature environments
Key Takeaway
PA dry-state embrittlement requires conditioning and plasticization treatment
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