Extrusion & Post
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PVA extruded film has gel particles
Problem Phenomenon
PVA extruded film surface shows 0.1-0.5mm transparent gel particles
Cause Analysis
High molecular weight components in PVA not fully melted during extrusion form local highly crystalline regions; extrusion temperature on the low side or insufficient mixing
Solution
1) Raise 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 a finer 120 mesh screen to intercept unmelted particles
Key Takeaway
Gel particles are caused by insufficient melting; raising temperature and mixing are the key
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