Extrusion & Post
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LDPE Film Bubble Sagging Wrinkles
Problem Phenomenon
The bubble sags locally forming long wrinkles, and thickness distribution deteriorates.
Cause Analysis
Excessive blow-up ratio, unstable haul-off speed, or uneven cooling makes the bubble lose its upright shape; over-stretching also directly breaks the bubble.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Reduce the blow-up ratio; ②Stabilize haul-off speed; ③Improve cooling uniformity; ④Control extrusion temperature.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Bubble sagging is a precursor of instability; timely parameter adjustment can prevent it from evolving into bubble breakage and shutdown.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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