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