Extrusion & Post
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LLDPE Blown Film Bubble Instability
Problem Phenomenon
The film bubble shakes, swings, or even bursts.
Cause Analysis
LLDPE melt strength is lower than LDPE, and film bubble stability is poor; improper air ring cooling and extrusion fluctuations amplify the instability.
Solution
① Optimize the air ring (rapid cooling to stabilize the film bubble); ② stabilize the extrusion output; ③ blend with LDPE to improve melt strength; ④ control ambient airflow; ⑤ appropriately lower the melt temperature.
Key Takeaway
LLDPE film bubble instability is the melt strength shortcoming, and blending can improve it.
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