Extrusion & Post
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HDPE Film Bubble Instability
Problem Phenomenon
HDPE blown film bubble sways, with uneven thickness
Cause Analysis
Insufficient melt strength or unstable air ring airflow destabilizes the film bubble; 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
Stabilize melt temperature; make air ring airflow uniform; select high-molecular-weight grades to increase melt strength; 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
Film bubble stability relies on melt strength and uniform airflow; 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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