Extrusion & Post
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Gel Particles on EVOH Extruded Film
Problem Phenomenon
EVOH extruded film surface shows 0.1-0.5mm transparent gel particles
Cause Analysis
High molecular weight components in EVOH not fully melted during extrusion forming local highly crystalline regions; extrusion temperature too low or mixing insufficient
Solution
1) Increase extrusion temperature by 5-10°C to ensure full melting; 2) Increase screw mixing section length; 3) Inspect raw material to ensure consistent grade; 4) Replace with finer 120 mesh screen to intercept unmelted particles
Key Takeaway
Gel particles are caused by insufficient melting; increasing temperature and mixing is key
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