Extrusion & Post
10 조회수
MP extruded film longitudinal streaks
문제 현상
MP extruded film surface has continuous streaks along the extrusion direction, width 1-3mm
원인 분석
die lip locally damaged or gap uneven; unstable flow from the melt stagnation zone inside the die; pressure fluctuation at the screw front end
해결 방법
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
핵심 요약
longitudinal streaks are caused by die defects and pressure fluctuation; die maintenance and pressure stability are key
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