Material Drying
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PA6 High Water Content Scenario 0.1%
Problem Phenomenon
Optical-grade PA6 products still show tiny bubbles even when dried to 0.2% moisture content
Cause Analysis
In high-requirement occasions such as optical and thin-walled transparent products, the trace amount of water vapor released at 0.2% moisture content is still enough to form visible bubbles in the cavity, and the moisture content needs to be pressed below 0.1%
Solution
The drying moisture content of high-requirement products is controlled at 0.1%: dehumidifying dryer dew point -40°C, temperature 90°C, time extended to 6-8 hours, and confirmed by actual measurement with the Karl Fischer method
Key Takeaway
Drying standards for high-requirement occasions must be raised accordingly; 0.1% moisture content is the threshold for optical-grade PA6; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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