Extrusion & Post
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EMA Extruded Film Longitudinal Stripes
Problem Phenomenon
Continuous stripes 1-3mm wide along the extrusion direction on the surface of EMA extruded film
Cause Analysis
Local damage or uneven gap of the die lip; unstable flow generated in the melt residence zone inside the die; pressure fluctuation at the front end of the screw
Solution
1) Check die lip flatness and gap uniformity ±0.01mm; 2) Clean the inside of the die to remove carbonized matter in residence zones; 3) Install a gear pump on the extruder to stabilize melt pressure; 4) Polish the die lip to Ra<0.1μm
Key Takeaway
Longitudinal stripes are caused by die defects and pressure fluctuation; die maintenance and pressure stabilization are key
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