Extrusion & Post
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CEF extrusion film longitudinal streaks
Problem Phenomenon
The surface of the CEF extruded film has continuous streaks along the extrusion direction, width 1-3mm
Cause Analysis
Local damage or uneven gap of the die lip; unstable flow generated in the melt residence area in the die; pressure fluctuation at the front end of the screw
Solution
1) Check the flatness of the die lip and the gap uniformity ±0.01mm; 2) Clean the inside of the die to remove carbides in the residence area; 3) Install a gear pump on the extruder to stabilize the melt pressure; 4) Polish the die lip to Ra<0.1μm
Key Takeaway
Longitudinal streaks are caused by die defects and pressure fluctuations; die maintenance and pressure stability are the key
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