Extrusion & Post
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DSTDP extruded film longitudinal streaks
Problem Phenomenon
DSTDP extruded film surface has continuous streaks 1-3mm wide along the extrusion direction
Cause Analysis
Die lip locally damaged or gap uneven; unstable flow produced in the melt residence zone inside the die; pressure fluctuation at the screw front end
Solution
1) Check die lip flatness and gap uniformity ±0.01mm; 2) clean die interior to remove carbonized matter in residence zones; 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 stability are key
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