Material Drying
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PA12 Silver Streak from Insufficient Drying
Problem Phenomenon
Silver streaks appear on the surface of PA12 products, concentrated in humid seasons or batches with damaged packaging.
Cause Analysis
PA12 amide groups absorb moisture; when the moisture content exceeds the standard, the moisture vaporizes during melting to form silver streaks and induce hydrolysis; moisture content exceeding 0.1% will cause problems.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Dehumidify and dry to moisture content <0.1%; ②keep the hopper dryer covered with dry air; ③use up promptly after opening or seal; ④set drying temperature and time according to the data sheet.
Key Takeaway
PA12 moisture absorption is lower than PA6/PA66 but hydrolysis problems also exist; 0.1% moisture content is the quality red line for its processing.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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