Extrusion & Post
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CEF extrusion film has gel spots
Problem Phenomenon
The CEF extruded film has transparent gel spots of 0.2-1mm
Cause Analysis
CEF residual crosslinked gel; the processing temperature is too high and local crosslinking occurs
Solution
1) Low gel content CEF; 2) Processing ≤220°C to avoid thermal crosslinking; 3) Screen 80-120 mesh interception
Key Takeaway
CEF gel spots are caused by residual crosslinking; raw material control and filtration are the key
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