Extrusion & Post
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LDPE Cast Film Die Lip Build-up
Problem Phenomenon
During cast film production, die lip build-up gradually increases and scratches appear on the film surface.
Cause Analysis
Melt stress concentration at the die lip and wall adsorption cause degraded material accumulation; the build-up falls off and scratches the film surface.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Add PPA processing aid to reduce build-up; ②Regularly clean the die lip; ③Optimize die lip temperature; ④Check die lip surface finish.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The cast film build-up problem can be effectively relieved with PPA; regular cleaning remains the basic guarantee.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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