Extrusion & Post
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LDPE Film Bubble Spiral
Problem Phenomenon
Film bubble spiral instability in LDPE blown film
Cause Analysis
Uneven die output or eccentric air ring airflow causes the film bubble to rotate and swing; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Calibrate die temperature zones; equalize air ring airflow; check output uniformity; 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, so as to locate the effective measure
Key Takeaway
For film bubble spiral check output and airflow uniformity; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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