Kneading disc blocks

PE/po yamide 6 = 75/25 Right-handed plus one left screw and three kneading disc blocks o Weight average domain size Number average domain size... 

However, the results depend on the arrangement of the modular elements. The modular co-rotating machine is much milder in the absence of kneading disc blocks. 

Figure 6.16 Erdmenger s single- and double-tipped kneading disc block machine [107].

Another special mixing section was described by Loomans [118] of Baker Perkins in a 1967 patent application. This is shown in Figure 6.20. These are essentially double-zipped kneading disc blocks with a 90° staggering angle. 

Basic experimental studies of flow in modular co-rotating twin-screw extruders began with Erdmenger [95,103], who observed the flow in the screw elements moved along the screw channels in a figure-8 motion but did not flow between the screws (Fig. 9.25). The more complex motions in the kneading disc blocks were noted. 

A second flow visualization study of fluid motions was published by Armstroff and Zettler [ 106] in 1973. The authors put the modular screws of a Werner and Pfieiderer ZSK into a transparent plastic barrel and investigated the motions of the process fluid. They observed alternative regions of filled and starved channels kneading disc blocks were generally fuUy... 

The analysis of flow of screw and kneading disc block in an intermeshing-co-rotating twin screw were concerned with both Newtonian and non-Newtonian by various researchers in the later years of 20th century [10-16]. However, the fluid mechanism and pumping characteristics of special elements were not much... 

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