Extrusion & Post
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LLDPE blown film bubble breakage
Problem Phenomenon
The bubble breaks during production.
Cause Analysis
Gel point rupture, extrusion fluctuations, excessive air ring air velocity; LLDPE has low melt strength and is more prone to bubble breakage.
Solution
①Reduce gel; ②stabilize extrusion; ③adjust air velocity; ④blend LDPE to increase melt strength.
Key Takeaway
Bubble breakage = weak points + low strength.
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