Abstract
A new method for the measurement of flow behavior index was tested using low density polyethylene (LDPE), corn meal, and waxy and dent corn starches. A specially designed dual orifice capillary die was attached to a pilot scale twin screw extruder, enabling two flow rates to be collected at one extruder condition. The power law index was determined using a ratio of these flow rates and the known lengths and radii of the capillaries. This method provides a more accurate and time efficient determination of the power law index of extruded food materials than is currently available. Values obtained for the LDPE ( n=0.47–0.67) were similar to those obtained with a capillary rheometer ( n=0.49). Likewise, values measured for corn meal ( n=0.34–0.58) and for waxy and dent corn starches ( n=0.62–0.72 and 0.40–0.43, respectively) compared well to literature values and followed expected trends.
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