Mixer single rotor

The mastication equipment most commonly employed is standard rubber instrumentation such as roll mills, internal mixers, extruders or laboratory devices modeled on them (e.g., a single-rotor internal masticator described by Wilson and Watson (43), die model improved by Kargin and coworkers (11) and the Brabender plastograph). 

The Ko-Kneader developed by List in 1945 for Buss AG in Germany, is a single-rotor mixer-compounder that oscillates axially while it rotates. Moreover, the screw-type rotor has interrupted flights enabling kneading pegs to be fixed in the barrel (12). 

Trough-and-screw mixers usually consist of a single rotor or twin rotors that continually turn the feed material over as it progresses toward the discharge end of the mixer. Some mixers have been designed with extensive heat-transfer surface area. The continuous-screw, Holo-Flite processor (Fig. 18-59) is used primarily for heat transfer, since the hollow screws provide extended surfaces without creating much shear. Two or four screws may be used. 

Plastication by kneading is done in variable shear roll mixers, in rotor mixers of the Banbury or Wemer-Pfleiderer type, or in twin-screw extruders or in special mixers. Plastication made in two-roll mixers is not economical and it is used mainly for batch production or to mix substances of different natures. For continuous line production, single or twin-screw extruders or a Buss KO-Kneader are used. These mixers or extruders operate in a friction mode this friction is obtained by a horizontal backward and forward motion of the screw. The screw may have threads or flights of regular width or of lai ger width and slantly cut in the rotational direction (see Fig. 14.10). Homogenization in these machines is so efficient that even fish-eyes present in PE and suspension polymerized PVC can be disaggregated [8]. 

Loughborough University continues to work on mixing and mixing mechanisms (155, 163), although recent published papers seem to concentrate on a single rotor continuous mixer (see Seetion 5.2). 

Kautschuk und Gummi Kunststoffe 55, No. 10, Oct.2002, p.535-9 SINGLE-ROTOR CONTINUOUS MIXER Freakley P K Fletcher J B Loughborough,University Carter Bros. 

Continnons mixing holds ont the promise of efficient and consistent mbber processing. In this article, a new powder blender and a continuous mixer are described, followed by a presentation of results from a prototype system. A layout of the system, equipped with a roller die output device is shown. Two dissimilar compounds, SBRandEPDM, were selected for initial evaluation of the single rotor continuous mixer (SRM). The purpose of the SBR compoimd was to... 

Indian Rubber Journal 61, March/April 2002, p.68-72 SINGLE-ROTOR CONTINUOUS MIXER (CARTER CONTINUOUS COMPOUNDER)... 

Using an experimental single-rotor mixer for the formation of a model mix based on SKMS-30 ARKM-27 butadiene-methylstyrene rubber, the authors studied the amount of carbon black introduced into the mix, the degree of dispersion and the torque as a function of the time to complete mixing with different rotor radii. 6 refs. Articles from this journal can be requested for translation by subscribers to the Rapra produced International Polymer Science and Technology. 

Trough-and-Screw Mixers These mixers usually consist of single or twin rotors which continually turn the feed material over as it... 

Many compounding processes are configured with a twin-rotor mixer or twin-screw extruder to perform the compounding followed by a single-screw extruder to pressurize the material for pelletization. A typical process is shown in Fig. 13.8. In... 

Fig. 22. Rotor designs for (a) single-stage and (b) two-stage continuous internal mixers [147]...

Fig. 10.6 The single-stage FCM. (a) Size 15 FCM with chamber opened and rotated hydraulically (b) top view of staged apex twin rotors and the axial zones for carrying out the solids feed handling and the melting and mixing elementary steps (c) cross-sectional view of two rotor orientations, tip-to-tip (cx) and tip-to-flat (c2). [Reprinted by permission from E. L. Canedo and L. N. Valsamis, Farrel Continuous Mixer Systems for Plastics Compounding, in Plastics Compounding—Equipment and Processing, D. B. Todd, Ed., Hanser, Munich, 1998.]...

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