Material Drying
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PA66 toughened grade drying
Problem Phenomenon
Toughened PA66 dried conventionally, impact performance still not up to standard with occasional silver streaks
Cause Analysis
The toughening system affects moisture diffusion and is more sensitive to hydrolysis, conventional drying conditions have insufficient margin for toughened grades; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Toughened grade drying time extended to 5-6 hours, moisture content controlled at 0.15%; prioritize grades with moisture-proof packaging; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Toughened grade drying standards must be raised, moisture-proof packaging prioritized; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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