Extrusion & Post
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LDPE Film Difficult Film Threading
Problem Phenomenon
During startup film threading, the bubble is difficult to rise stably and breaks frequently.
Cause Analysis
During the threading stage, temperature and air volume have not reached balance, and manual haul-off rhythm is unstable; speed is raised hastily before the melt state stabilizes.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Stabilize extrusion first, then thread the film slowly; ②Use auxiliary tools to pull the bubble upward; ③Introduce compressed air gradually; ④Increase output only after stabilization.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Film threading is the key operation at startup; slow start and steady transition can reduce startup waste.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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