By Hellenthal W.
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When this happens, shear deformation is insufficient to break the agglomerations into their constituent parts. Agglomerations within a polymer matrix define a poorly mixed product. Many ingenious schemes are known to improve the basic screw. Since the 1950s, a variety of mixers have been available. Some of these force material into small spaces for additional shearing. Some divide the flow into many streams so that smaller masses are sheared more effectively. Some make use of pins embedded in the root of the screw and some cut the screw flights.
It shows that the SFEM Elongator is elongationally dominant because it breaks down blends of high viscosity ratios that cannot be dispersed by shear alone. 14 is a plot of mixtures processed on four different mixers: two batch and two continuous. The numbers indicate the MI (melt index) of the PE component in the 70% PP (polypropylene) 30% PE (polyethylene) blend. The vertical axis shows the distribution of the minor phase domains. Domains are actually like spheres: the lower the number, the smaller the diameter and the better the mixing.
The jamming is reflected in higher screw torque, which we see as higher motor load. The ACR must be high enough to squeeze out the air from the feedstock, but not so high that it prevents material from flowing to the next section. The lower bulk density of some HME mixtures also requires a change to the screw. Since there is a lower bulk density in the feed flights, there is also less mass. A 3:1 ACR is general-purpose only because pellets are the most common feedstock. These dense pellets will generally fill the screw once the air is removed during compression and create a stable flow.