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I have a barrel extruder that is extruding plastic. I need to find the shape factor...

I have a barrel extruder that is extruding plastic. I need to find the shape factor for a square die opening given a width and length of the die opening. I also know the viscosity of the plastic melt. Any direction would be greatly appreciated.

Engineering   Mechanical-Engineering   
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Answer #1

The effect of the die orifice shape can be assessed by the die shape factor, defined as the ratio of the pressure required to extrude a cross-section of a given shape relative to the extrusion pressure for a circular cross-section of the same area.

kx=0.98+0.02*[(cx/cc)^2.25]

Where kx is the die shape factor in extrusion; cx is the perimeter of the extruded cross-section, and cc is the perimeter of a circle of the same area as the actual extruded shape.

Generally, The value of (cx/cc) varies from 1 to 6.

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