Double-spiral mixer

Typical batch mixers include planetary mixer [shear] blade (Helen) mixer [convection shear] blade (double-arm) mixer [convection shear] paddle (pan-type) mixer [shear] paddle (Marion) mixer [shear diffusion] tumbler (drum) mixer [shear, diffusion] tumbler (double-cone) mixer [shear] tumbler (twin-shell) mixer [shear] Muller mixer [shear] mill mixer [shear] ribbon mixer [convection diffusion] vertical spiral mixer [convection diffusion] Nautal mixer [convection diffusion] Banbury mixer [shear] airmix mixer [convection diffusion] Lodige mixer [shear diffusion] gravity mixer [convection] and vibratory mixer [convection shear]. 

Some of the more widely used high-performance screws include the Energy Transfer (ET) screw [19], the Variable Barrier Energy Transfer (VBET) screw [20], the Double Wave screw [21], Stratablend [22] and Stratablend II [23] screws, and the Unimix [24] screw. Other devices can, however, act as a trap for solid materials from the melting section. These devices include Maddock-style mixers [25], spiral dams, and blisters. They will be briefly discussed in this section as many of them have been the subject of many articles on secondary mixing processes. 

---