Extrusion & Post
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LDPE Film Unstable Melt Pressure and Thickness Fluctuation
Problem Phenomenon
The melt pressure gauge fluctuates greatly, and film thickness changes randomly accordingly.
Cause Analysis
Melt pressure or temperature too high with large fluctuation makes the extrusion melt flow unstable; screw wear and feeding fluctuation are also transmitted as pressure fluctuation.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Adjust temperature and extrusion speed to stabilize the process; ②Repair the screw and feeding; ③Monitor the melt pressure trend; ④Install a melt pump when necessary.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Pressure stability is the prerequisite for thickness stability; melt pressure monitoring is the most direct stability indicator.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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