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