Extrusion & Post
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LLDPE Blown Film Bubble Instability
Fenómeno do problema
The film bubble shakes, swings, or even bursts.
Análise das causas
LLDPE melt strength is lower than LDPE, and film bubble stability is poor; improper air ring cooling and extrusion fluctuations amplify the instability.
Solução
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.
Conclusão principal
LLDPE film bubble instability is the melt strength shortcoming, and blending can improve it.
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