Material Drying
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PA66 over-drying embrittlement
Problem Phenomenon
After pellet moisture content is reduced too low, product brittleness increases instead, impact test unqualified
Cause Analysis
Over-drying (over 110℃ or over 12 hours) causes thermal oxidation, PA66 pellets yellow, impact and elongation at break decline; recycled material has higher risk due to accumulated heat history
Solution
①Control moisture content in the 0.1-0.2% range, do not blindly pursue lower; ②if not put into production after 8 hours, lower to 70-80℃ for heat preservation; ③shorten drying time for recycled material and strengthen verification
Key Takeaway
PA66 drying has over-drying risk; 0.1-0.2% is the target range, overtime heat preservation with temperature reduction is the standard handling for production handover; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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