Colloid mill is a machine used in the disintegration of solid particles or droplet size of a liquid present in suspension or emulsion. The machine consists of an inlet (which is subjected to a tremendous shearing action that effects a time dispersion of uniform size) and an outlet. Colloid mill works on the rotor-stator principle. The equipment breaks down materials by forming dispersion of materials in a liquid. Shearing takes place in a narrow gap between a static cone (the stator) and a rapidly rotating cone (the rotor). To reduce wear, the rotor and stator are constructed using toughened steel or corundum. The rotor of a colloid mill can differ from one machine to another but the operating principle is the same for all. Each manufacturer incorporates specific features that result in changes in operating efficiency. The final size of the product obtained after comminution is a function of the followings; Homogenization intensity and duration The viscosity of the continuous phase. Th...
Fluidized bed dryer (also called fluid bed dryer) is a kind of equipment used extensively in the pharmaceutical industries to reduce the moisture content of pharmaceutical powder and granules. The equipment works on a principle of fluidization of the feed materials. In fluidization process, hot air is introduced at high pressure through a perforated bed of moist solid particulate. The wet solids are lifted from the bottom and suspended in a stream of air (fluidized state). Heat transfer is accomplished by direct contact between the wet solid and hot gases. The vaporised liquid is carried away by the drying gasses. Sometimes to save energy, the exit gas is partially recycled. A typical fluidized bed dryer consists of the following components Air preparatory unit. Product container. Exhaust filter. Exhaust blower. Control panel. Air distribution plate. Spray nozzle. Solution deliver. The choice of distributor used during and drying process apart from ensuring uniform and stable fluid...