Extrusion & Post
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Frequent Screen Clogging in EVOH Extrusion
Problem Phenomenon
EVOH extrusion requires screen replacement every 2-3h; clogging causes sudden pressure rise and output decrease
Cause Analysis
Many gel particles and impurities in raw material; screen mesh too high intercepting large amounts of particles; filler or color masterbatch agglomeration clogging the screen
Solution
1) Select raw material with low gel content; 2) Use stepped screens 40/80/120 mesh; 3) Add filler and color masterbatch via masterbatch method to reduce agglomeration; 4) Install automatic screen changer to reduce downtime
Key Takeaway
Screen clogging is caused by impurities and improper configuration; raw material control and stepped screens are key
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