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High-shear mixers for fine dispersions and emulsions

| By Gerald Ondrey

Batch high-shear mixers equipped with the Solids/Liquid Injection Manifold (SLIM) Technology (photo) deliver powders in an efficient manner for quick wet-out and complete dispersion into low-viscosity liquids. In a conventional rotor/stator mixer, materials are continually drawn from below the mixing head and then expelled at high velocity through the stator openings. A SLIM mixer assembly with Progressive Spiral Porting creates a powerful vacuum that draws powders directly into the high shear zone and rapidly disperses individual solid particles into the liquid vehicle. This method of powder addition dramatically reduces the formation of lumps (fisheyes), prevents floating powders, eliminates dusting, and accelerates mixing time, says the manufacturer. The SLIM can also be used to introduce minor liquid components and create fine emulsions. To easily raise and lower the mixer in and out of the mix vessel, a floor-mounted design equipped with an air/oil hydraulic lift is available. Safety limit switches prevent operation of the mixer while in a raised position or without a mix vessel in place. — Charles Ross & Son Company, Hauppauge, N.Y.