Material Drying
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HDPE Bubble
Problem Phenomenon
HDPE product internal bubbles or vacuum voids
Cause Analysis
Thick-wall vacuum voids are caused by insufficient shrinkage compensation, thin-wall bubbles by moisture or entrapped air; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Add holding pressure for thick walls; check drying and venting for thin walls; slice to identify the type; after adjustment, continuously sample 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
Bubbles are treated by type according to thick or thin position; 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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