Material Drying
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PC moisture content 0.02% red line
Problem Phenomenon
【Problem Phenomenon】PC drying released by experience, moisture content exceeding standard causes silver streaks and brittle fracture
Cause Analysis
PC is strongly hygroscopic and extremely prone to hydrolysis at high temperature, moisture content must be ≤0.02%; excessive moisture at 280-320℃ causes PC hydrolysis with molecular weight plummeting, appearance silver streaks and impact strength drop occurring simultaneously
Solution
Dehumidifying dryer 120℃×3-4h; moisture meter measured ≤0.02% before release; dried material goes directly into the machine to prevent moisture regain；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC moisture content 0.02% is the life-and-death line, measured release not by experience；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence；Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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