Mixing twin shell blender

Operations with high cross-contamination potential (e.g., mixtures of test or control articles with animal diets) are often conducted in small, dedicated, individual cubicles equipped with special and separate air-handling systems or are conducted under a fume hood. Special mixing equipment (e.g., enclosed twin-shell blenders) can be used to reduce the chance of cross-contamination. 

Wiedenbaum SS. Mixing of solids in a twin shell blender. Ceramic Age 1963 (August) 39 3. 

The powder produced in the prior operation is combined with the second active ingredient (B2), as well as several other excipients in a twin-shell blender and mixed for several min. For reasons previously discussed, mix time is of interest, and thus it is listed as a critical process step. 

Pre-Extrusion Blending. Based on the moisture contents of the corn starch and various protein sources, blends of 0,5,15,30, and 50% (dry weight) of each protein source were made by first dry mixing for 10 minutes in a Paterson-Kelly Model LB-P-8 twin shell blender followed by the appropriate amount of 20°C tap water to obtain a total moisture content of either 15 or 25% (wet basis). The moistened mixtures were then blended for an additional 20 minutes followed by overnight equilibration at room temperature in air-tight bags. 

Industrial equipment. Rotating-shell mixers or tumbling mixers are shown in Fig. 3. Drum-type, cubical-shaped, double-cone, and twin-shell blenders with their axis of rotation horizontal to the center of the drum on its axis increase crossflow and improve the mixing action. Cubical and polyhedron-shaped... 

Effective mixing of solids is also accomplished by rotating the sample for some time in a ball mill or a twin-shell V-blender. The latter consists of two connected cylinders that form a V-shaped container for the sample. As the blender is rotated, the sample is split and recombined with each rotation, leading to highly efficient mixing. 

Tumble blender Twin shell/double cone Mild mixing action Mild mixing action Powder lumps will not break up Low humidity results in static charge buildup High humidity leads to lumping... 

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