Intermeshing counter rotating twin screw machine

Figure 1.20 Leistritz modular intermeshing counter-rotating twin-screw extruders [120-124] (a) Tenner CC machine (b) Thiele counter flight machine.

The intermeshing counter-rotating twin-screw extruder has not only the mixing qualities of its machine elements, but it exerts high stresses by the calendering action of its screws. This leads to superior performance in dispersive mixing. 

Thanks to their residence time distributions, co-rotating, closely intermeshing twin-screw extruders have assumed a dominant market position. Other machines, such as single-screw and counter-rotating extruders are used only for special tasks. Fig. 4.7 [35]. 

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