Extrusion & Post
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LDPE Film Longitudinal Thickness Fluctuation
Problem Phenomenon
The film thickness changes periodically along the longitudinal direction, and the thickness curve is wavy.
Cause Analysis
Main motor speed fluctuation (loose belt), uneven haul-off roll rotation, unstable resin temperature, and frost line position changes all cause longitudinal thickness fluctuation.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Maintain the main motor transmission system; ②Repair the haul-off device; ③Check heater stability; ④Fix the frost line position after adjustment.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The periodic characteristics of longitudinal fluctuation correspond to specific equipment components; back-tracing by period is the fastest locating method.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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