Extrusion & Post
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HDPE blown film bubble instability
Problem Phenomenon
The film bubble shakes and wobbles, and the thickness fluctuates greatly.
Cause Analysis
Insufficient melt strength and extrusion stability; uneven air ring cooling, extrusion output fluctuations, ambient airflow disturbance.
Solution
①Stabilize the extrusion output (check feeding and screw); ②uniform air supply from the air ring; ③shield ambient airflow; ④appropriately increase melt strength (adjust temperature/grade).
Key Takeaway
Stable bubble = stable extrusion + uniform air ring + quiet environment.
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