Abstract
AbstractPrevious studies of starch viscosity during extrusion have been made without detailed data on the density of starch/water systems, at the temperatures and pressures common to extrusion. Density data are needed to convert the extruder mass output into volumetric output for calculations of shear rates. Earlier studies have assumed constant density, despite changes in temperature, pressure, and moisture content. Using recently published data on starch density, it is shown that density corrections have minimal impact on results compared to the constant density assumption. The power law index remains unchanged, and changes in the consistency are within experimental error. The choice of a reference density is the determining factor in shear rate calculations. Similar results are obtained for low density polyethylene, and, by extension, other polymer melts.
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