Extrusion & Post
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Unstable film bubble in PLA blown film process
Problem Phenomenon
The film bubble swings and breaks during the PLA blown film process.
Cause Analysis
The PLA melt strength is low, the film bubble is greatly affected by the air flow and is unstable, and the cooling is uneven.
Solution
Use melt strength enhanced PLA (branched PLA); stabilize the cooling air ring.
Key Takeaway
PLA blown film needs to enhance the melt strength.
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