Dear Researchers :
Does someone know something, or is acquainted with the issue of "Flow Lines" (also called "Flow Marks" or "Streaks") on the extrusion process of insulation layers on Electric Cables.
I am investigating about this defect,
Why cause them ? How can be eliminates ? What are the factors to make them appear on the cable ? Etc.
Kindly, Franklin U.
Flow lines, streaks or flow marks are the result of flow instability that occur when the the rate of shear acting becomes higher that a critical value. Due to higher rate of shear the melt experiences higher normal stress differences causing die swell + sudden change in the temperature after melt comes out of extrusion + the adhesion between melt and die surface combine to give streaks.
Dr. B R Gupta
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