Extrusion & Post
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PLA blown film bubble instability
Problem Phenomenon
PLA blown film bubbles are easy to break and hard to stabilize.
Cause Analysis
PLA has low melt strength; the narrow processing window makes bubble control difficult.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
① Add chain extenders to increase melt strength; ② blend with other polymers; ③ reduce the blow-up ratio; ④ stabilize cooling.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA blown film requires melt strength modification; long-chain branching agents and blending are effective means.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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