Closely intermeshing corotating twin screw extruders

FIGURE 8.2 Self-wiping closely intermeshing corotating twin-screw extruder. Flow of material in double-flighted screw elements (left). Cross section of the barrel showing the pertinent dimensions (right). 

A) BerstorfT ZE 25 x 33D Corotating twin-screw extruder, closely intermeshing 25 33 0.88 Neutral kneading block at 14D Mixing gears at 18D, 23D, and 28D... 

These two-phase polymers are generated in an optimized single-stage process using a corotating, close-intermeshing, twin-screw extruder. 

The closely intermeshing twin-screw extruders, both counterrotating (e) and corotating (f), can best be modeled as series of C-shaped chambers. Due to the rotation of the screws these chambers transport the material from hopper to die, while... 

In this section we consider the essential features of two of the most common types of twin-screw extruders self-wiping corotating (SWCOR) twin-screw extruders and closely intermeshing counterrotating (CICTR) twin-screw extruders. As discussed in Section 8.1.2, there are a vast number of types of twin-screw extruders, and it is not possible to discuss all of these here. Further discussion of the technology and theory for twin-screw extruders is given elsewhere (Rauwendaal, 1986 White, 1990). 

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