Extrusion & Post
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LCP Melt Filter and Screen Changer Blockage
Problem Phenomenon
【Problem Phenomenon】In LCP extrusion pelletizing or film production, the screen pressure differential rises quickly, requiring frequent screen changes
Cause Analysis
At high temperature, small amounts of degraded carbonized material and foreign impurities accumulate on the screen; LCP's high processing temperature intensifies carbonization of trace impurities and worsens screen blockage; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
Improve raw material cleanliness control and dry to prevent degradation; optimize screen mesh and screen change cycle according to the pressure differential curve; keep the screen changer area warm to prevent cold material solidification; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
High-temperature LCP extrusion blocks screens quickly; clean raw material and pressure differential management are the focus; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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