Extrusion & Post
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Gel particles in PU extruded film
Problem Phenomenon
0.1-0.5mm transparent gel particles appear on the surface of PU extruded film
Cause Analysis
High molecular weight components in PU are not fully melted during extrusion, forming local highly crystalline regions; extrusion temperature too low or insufficient mixing
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 are key
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