Extrusion & Post
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MP extruded film longitudinal streaks
Fenómeno do problema
MP extruded film surface has continuous streaks along the extrusion direction, width 1-3mm
Análise das causas
die lip locally damaged or gap uneven; unstable flow from the melt stagnation zone inside the die; pressure fluctuation at the screw front end
Solução
1) check die lip flatness and gap uniformity ±0.01mm; 2) clean the die interior to remove carbonized material in stagnation zones; 3) install a gear pump on the extruder to stabilize melt pressure; 4) polish die lip to Ra<0.1μm
Conclusão principal
longitudinal streaks are caused by die defects and pressure fluctuation; die maintenance and pressure stability are key
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