Extrusion & Post
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LDPE Film Bubble Low-temperature Sagging
Problem Phenomenon
The frost line is too high, approaching the collapsing frame, making bubble haul-off difficult and thickness out of control.
Cause Analysis
Insufficient cooling moves the frost line upward; extrusion output too large relative to cooling capacity also pushes the frost line up.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Increase air volume or lower air temperature; ②Appropriately reduce extrusion output; ③Check air ring efficiency; ④Adopt an internal cooling system.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Frost line position is the result of the balance between cooling and output; when it exceeds the limit, choose either reducing output or increasing cooling.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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