Extrusion & Post
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Melt instability when extruding PEI film
Problem Phenomenon
Melt edge fluctuation and uneven thickness occur during film extrusion
Cause Analysis
PEI melt strength is insufficient to maintain the shape after exiting the die; the extrusion temperature window is narrow and difficult to adjust
Solution
Optimize the extruder screw design to improve plasticization uniformity; use a melt pump to stabilize extrusion pressure; increase the die temperature to improve exit flowability
Key Takeaway
PEI extrusion molding has strict requirements on equipment and process parameters
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