Extrusion & Post
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Gel particles in PU extruded film
Problembeschreibung
0.1-0.5mm transparent gel particles appear on the surface of PU extruded film
Ursachenanalyse
High molecular weight components in PU are not fully melted during extrusion, forming local highly crystalline regions; extrusion temperature too low or insufficient mixing
Lösung
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
Wichtigste Erkenntnis
Gel particles are caused by insufficient melting; increasing temperature and mixing are key
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