Melt flow rate property correlations

Thus, both the mean droplet size and the size distribution may be predicted using these correlations [Eqs. (26), (27), (28), or (29) and Eqs. (30), (31)] for given process parameters and material properties. For a given atomizer design, the standard deviation of droplet size distribution has been found to increase with the melt flow rate, but appears to be less sensitive to the gas flow rated5 Moreover, the variation of the standard deviation is very atomizer- and melt-specific. An empirical correlation which fits with a wide range of atomization data has the following form ... 

In conclusion, it should be pointed out that recently [51], a considerable growth of specific fluid volumetric flow rates was discovered near the saturation pressure on filtra tion of the solution of C02 in normal heptane and gas-liquid fossil carbohydrates (oils). A possible explanation of this effect can be found in the above theoretical discussion. Finally, going back to M. Amon and C. D. Denson s work [33], which was discussed at the end of Sect. 4, let us admit that their thesis No. 4 (melt properties as regards thermoplastic itself do not depend on gas concentration) is quite correct and in good correlation with experimental results [21]. 

Too little has been published about the flow properties of PET as a criterion for processing. The results of melt flow index (MFI) testing conditions do not correlate with the processing behavior in the case of PET. This may be caused by the discrepancy between the shear rates in testing and processing. MFI is defined as the amount of polymer melt (in g) extruded within 10 min through an orifice of specified diameter at a standard load and temperature. In the case of PET, this method was not very popular until recently due to the sensitivity of this material to hydrolytic degradation. 

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