Material Drying
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PC Bubbles and Vacuum Voids
Problem Phenomenon
[Problem Phenomenon] Bubbles inside PC products; distinguishing gas cavities from vacuum voids
Cause Analysis
Bubbles (moisture or degradation gas) and vacuum voids (insufficient feeding shrinkage in thick walls) have different causes: bubble walls are smooth and randomly distributed, while vacuum voids concentrate in the thick-wall core; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
For the gas cavity type, check drying and degradation; for the vacuum void type, strengthen holding and feeding and reduce material in thick walls; section to locate the type; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PC bubbles divide into gas cavities and vacuum voids, and the position distribution determines the cause; 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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