Extrusion & Post
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HDPE Film Bubble Instability
Fenómeno del problema
HDPE blown film bubble sways, with uneven thickness
Análisis de la causa
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
Solución
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
Conclusión clave
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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