Extrusion & Post
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EVA extruded film has gel particles
Problem Phenomenon
Transparent gel particles of 0.1-0.5mm appear on the surface of EVA extruded film
Cause Analysis
High molecular weight components in EVA 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 the length of the screw mixing section; 3) Inspect raw material to ensure consistent grade; 4) Replace with a 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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