Extrusion & Post
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LDPE Film Bubble Breathing
Problem Phenomenon
The bubble diameter expands and contracts periodically, and film width and thickness fluctuate.
Cause Analysis
Changes in air volume inside the bubble trigger internal pressure fluctuation; unstable cooling system air volume and extrusion output pulsation are the main causes.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Stabilize cooling system air volume; ②Lower melt temperature; ③Appropriately reduce extrusion output; ④Check the condition of the bubble stabilizing device.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Bubble breathing reflects the dynamic imbalance between internal pressure and cooling; stabilizing the two inputs of air and material calms it down.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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