Counterrotating nonintermeshing

Injection molding Counterrotating, nonintermeshing twin screw extruder Gear pump... 

The continuous mixer (CM) is a counterrotating, nonintermeshing twin-rotor machine. The Farrel Continuous Mixer (FCM) was the first CM developed (1964) by Ahlefeld et al. (8). It has rotor designs along the principles of the Banbury3 high-intensity batch mixer. 

Fig. 10.31 (a) Staggered- and (b) matched-screw flights in a counterrotating, nonintermeshing... 

Fig. 10.50 Location of the pressure gauge (P) and the thermocouples (7) at the five axial barrel positions. The three cross sections A-A, B-B and C-C are used for contour plots of the numerical results. [Reprinted by permission from T. Ishikawa, S. Kihara, K. Funatsu, T. Amaiwa, and K. Yano, Numerical Simulation and Experimental Verification of Nonisothermal Flow in Counterrotating Nonintermeshing Continuous Mixers, Polym. Eng. Sci., 40, 365 (2000).]...

Fig. 11.13 Schematic representation of the twin-screw flow directions in (a) the conversional counterrotating nonintermeshing TSE, and (b) its back-mixed extruder variant. [Reprinted by permission from Y. Lu, Ph.D Dissertation, Department of Chemical Engineering, Stevens Institute of Technology, Hoboken, NJ, 1993.]...

Figure 5.30 Twin-screw extruders (a) counterrotating, fully intermeshing (6) corotating, fully intermeshing and (c) counterrotating, nonintermeshing. ...

Figure 9.2 Twin-screw extruder, counterrotating, nonintermeshing, for compounding, model HTR2800-511-512-E1. Unit shown has panel open for access to barrel and heater elements. Set of extruder screws shown in front, and seven-zone temperature control panel with loss-in-weight feeder controls and main drive motor controls, stands at right of machine. (Photoprovided by Welding Engineers, Inc.)...

For a welding engineer counterrotating nonintermeshing twin-screw extruder, the barrel section does not appear radically different from the intermeshing barrels shown previously and the drive system components are similar. The only slight difference is the apex area of the barrel where the metal on top and bottom of the bore extend farther toward each other due to the larger screw center line separation distance. 

FIGURE 8.6 Various types of twin-screw extruders (a) counterrotating intermeshing elements, (b) corotating intermeshing elements, and (c) counterrotating nonintermeshing elements. 

Fig. 10. Schematic representation of nonintermeshing counterrotating twin-screw extruder.

Counterrotating, Tangential, Nonintermeshing Twin Screw Extruders... 

Fig. 10.30 Counterrotating, tangential, nonintermeshing TSE. (Schematic, Courtesy of Welding Engineers.)...

The back-mixed extruder is a variant of the conventional nonintermeshing (tangential) counterrotating TSE represented on Fig. 11.13(a) both counterrotating screws in this LCFR create a dominant downstream flow with no back mixing and with some mixing screw-to-screw flow. By contrast, the two counterrotating screws of the back-mixed reactor... 

Nonintermeshing counterrotating machines have the oldest technology (19). The Parrel continuous mixer (PCM) remains today as a good compromise of the Banbury batch mixer but with continuous mixing capability with the small mass concept. The incorporation of various fillers into polypropylene (talc, calcium carbonate, etc.) at 30-80 wt% levels is still accomplished via the PCM. 

Additional flexibility is engineered into the twin-screw section. The screws can be selected to be corotating, counterrotating, intermeshing, or nonintermeshing. ... 

Counterrotating intermeshing twin-screw extmd-ers have the narrowest residence time distribution followed closely by co rotating intermeshing twin-screw extmders. Counter rotating nonintermeshing twin-screw extruders have the broadest residence time distribution. 

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