Extrusion & Post
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POE extrusion film longitudinal streaks
Problem Phenomenon
POE extruded film surface shows continuous streaks along the extrusion direction, width 1-3mm
Cause Analysis
Local damage to die lip or uneven gap; melt residence zone inside the die produces unstable flow; pressure fluctuation at the screw front end
Solution
1) Check die lip flatness and gap uniformity ±0.01mm; 2) Clean the die interior to remove carbonized material in the residence zone; 3) Install a gear pump on the extruder to stabilize melt pressure; 4) Polish die lip to Ra<0.1μm
Key Takeaway
Longitudinal streaks are caused by die defects and pressure fluctuation; die maintenance and pressure stabilization are key
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