Extrusion & Post
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HDPE film bubble breakage
Problem Phenomenon
The film bubble suddenly breaks and the film breaks during production, mostly occurring after production increase or material change.
Cause Analysis
The melt strength is insufficient to withstand the stretching of the selected blow-up ratio; excessive extrusion output, too aggressive cooling or entrained impurities and bubbles can also induce film breakage.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Reduce the blow-up ratio or extrusion output; ②increase the melt strength (lower the temperature or select material); ③eliminate bubbles and impurities in the raw material; ④check the air ring airflow impact.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Film breakage indicates that the stretching exceeds the limit the melt can withstand; reduce the load and stabilize the process first, then gradually optimize the output.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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