Barr ring mixer

Figure 8.23 Schematic of blister ring mixers a) a blister mixer positioned in a metering section, b) blister section positioned at the discharge end of the screw near the tip, and c) the cross-sectional view showing the region of annular flow between the screw and barrel wall (courtesy of ieff A. Myers of Robert Barr, Inc)...

Figure 8.30 Cross-sectional views [53] of the extrudate samples using a conventional screw with segmented tip for the testing of different types of dynamic mixers a) conventional screw with no mixer, b) Twente Mixing Ring, and c) Barr Fluxion ring mixer. The extruder was operated at a screw speed of 80 rpm and a letdown ratio of 220 1 of a white pigmented ABS resin to a black color concentrate...

The mixers compared were a TMR and two Barr mixers. The Barr sleeve mixer had elongated cavities in the rotor which joined pairs of circular cavities in the ring during rotation. The second cavity was connected to the next pair via a space between ring and barrel, the ring kept centrally by raised flanges between each diversion (Figure.10.8). 

Figure 10.8 Barr floating ring mixer. Reproduced with permission from J.A. Myers, R.A. Barr, M.A. Spalding and K.R. Hughes in Proceedings of the Annual SPE Conference - ANTEC, New York, NY, USA, 1999, Volume 1, p.l57. 1999, SPE)...

Figure 8.29 Schematic for a Barr Fluxion mixing ring a) mixer with a cutaway section of the ring exposing the surface of the rotor, and b) the flow path for the mixer...

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