Extrusion & Post
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MP extruded film gel particles
Problem Phenomenon
MP extruded film surface shows 0.1-0.5mm transparent gel particles
Cause Analysis
high molecular weight components in MP not fully melted during extrusion, forming local high-crystallinity zones; extrusion temperature low or mixing insufficient
Solution
1) raise extrusion temperature 5-10°C to ensure full melting; 2) increase screw mixing section length; 3) inspect raw material to ensure consistent grade; 4) replace with a finer screen 120 mesh to intercept unmelted particles
Key Takeaway
gel particles are caused by incomplete melting; raising temperature and mixing are key
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