Rotary laboratory mixer BE Series

analogfor the pharmaceutical industry

Silverson’s sanitary series of high shear Bottom Entry mixers are designed to fit into the bottom or side of a mixing vessel. These high shear mixers are typically used in conjunction with a slow speed anchor stirrer or scraper unit for high viscosity products. The Silverson Bottom Entry mixer gives high shear homogenization while the stirrer/scraper distributes the homogenized output uniformly through the vessel. This is ideal for high viscosity cosmetic, pharmaceutical and food products. Bottom Entry mixers can also be used by themselves on low viscosity products and to wet out powders. Silverson Bottom Entry mixers offer full compliance with cGMP and USDA requirements. How It Works The advantages of Silverson’s Bottom Entry mixer over simple conventional stirrers or agitators stem from the multistage mixing/shearing action as materials are drawn through the specially designed Silverson workhead - the heart of every machine. Stage 1 The high speed rotation of the rotor blades exerts a powerful suction, drawing liquid and solid materials downwards into the center of the workhead. Stage 2 Centrifugal force then drives the materials towards the periphery of the workhead where they are milled in the clearance between the rotor and the stator. Stage 3 The materials are subjected to intense hydraulic shear as they are forced out through the stator and projected radially at high speed towards the sides of the mixing vessel. Fresh material is simultaneously drawn into the workhead, maintaining the mixing cycle.