Material Drying
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PC insufficient drying hidden brittle fracture
Problem Phenomenon
【Problem Phenomenon】PC products appear normal in appearance but break brittlely during assembly or dropping, a hidden failure
Cause Analysis
When drying insufficiency is slight, there are no silver streaks in appearance but the molecular weight has already decreased, and impact strength is greatly impaired; this hidden failure is the most dangerous, only exposed during assembly or use；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Moisture content strictly measured; impact strength sampling inspection; hidden brittle fracture traced to drying records；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability；Change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Insufficient PC drying causes hidden brittle fracture; normal appearance does not mean qualification；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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