Extrusion & Post
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LDPE Film Bubble Spiral
Problembeschreibung
Film bubble spiral instability in LDPE blown film
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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