Friday, September 28, 2007

 

Equations of Extrusion

When I first tested my extruder I found that the filament diameter varied with extrusion speed. The filament expands after it passes through the nozzle aperture and this is known as die swell. I seem to have variable die swell whereas others have reported constant die swell. I have done some fairly detailed experimental work to get to the bottom of it and I think I have a simple explanation and a mathematical model to exploit it.

Further details here:

Incidentally, I read that die swell in polypropylene can be eliminated by the addition of carbon nanotubes: http://www.azom.com/details.asp?ArticleID=2601

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