Extrusion & Post
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LDPE Film Bubble Diameter-to-Height Ratio
Problem Phenomenon
The bubble shape is abnormal; inspection finds the diameter-to-height ratio is out of proportion.
Cause Analysis
The bubble diameter-to-height ratio should be kept between 1:3 and 1:5; a disproportionate ratio makes the distribution of cooling and stretching unreasonable.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Adjust the bubble diameter-to-height ratio to 1:3~1:5; ②Match the air ring position; ③Optimize haul-off and blow-up; ④Observe the bubble shape for fine-tuning.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The bubble shape ratio is the basic constraint of process geometry; a reasonable ratio ensures space for cooling and stretching.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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