Extrusion & Post
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Glass Fibre extruded film longitudinal streaks
Problem Phenomenon
Glass Fibre extruded film surface has continuous streaks along extrusion direction, width 1-3mm
Cause Analysis
Die lip locally damaged or gap uneven; melt stagnation zone in die produces unstable flow; pressure fluctuation at screw front end
Solution
1) Check die lip flatness and gap uniformity ±0.01mm; 2) clean die interior to remove stagnation zone carbide; 3) install gear pump on 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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