Sparkler Ceramics Pvt. Ltd
Air Jet Mill| ENGINEERING FEATURES: |
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Sparkler Air Jet Mills / Micronisers are engineered for the following functions:- Mills are lined with replaceable abrasion resistant elastomer linings or stainless steel that should adequately meet the requirement of contamination free grinding of all the materials usually encountered for the pulverizing action. In FEP Mills, as the particles move in high velocity gases, rather than being pulverized between rods, pins, jaws or hammer, heat does not build up. In fact, the adiabatic expansion of compressed air takes place with the resultant cooling effect. Heat sensitive and low melting point material such as waxes, insecticides and resins are pulverised without the use of freeze grinding method and clogging. Highly reactive, oxidizing and pyrophoric materials are micronised safely and efficiently. Particles are handled dry and the output can be bagged. Moreover, the grinding time in these mills is just a fraction of what is being taken in high speed ball / vibratory mills, where wet grinding is mandatory to produce particles less than 10 micron. The mill is easily opened and closed. Parts can be assembled or dismantled for cleaning and reassembled quickly. Directly opposing force principle results in the greatest efficiency in the use of compressed fluid for grinding. Wear and contamination in Sparkler design is insignificant as compared to conventional design of other fluid mills, which rely on the tangential impact against mill interior surfaces. The design embodying impact of opposing jets is four times more productive than the orthodox spiral design. Intelligent selection and application of variable control factor can provide cut points of minimum or maximum size of particles in the low micron range and the stringent requirement of particle size distribution can be achieved. Broadly, the variable control parameters are: Fluid energy pulverizing is usually more expensive than mechanical pulverization, but is justified on account of its inescapable necessity, which often outweigh the economy factor. The instantaneous increase of surface area in fluid energy pulverizing results in new and unusual chemical and physical properties relating to suspendability, solid-state reaction rates, texture, color and absorption. Coating of particles along with pulverizing function is feasible by injection of coating materials into the feed and intimate mix of coated particles is produced because of the unique fluid dynamics of FEP Mill. This has found acceptability in plastic compounding. |
INTRODUCTION:
| OPERATING PRINCIPLE: |
| Sparkler Fluid Energy Pulverizers (FEP) has no moving parts. The functional principle of the pulverisers are depicted in the diagram shown above. The required input energy for the grinding action is derived from the compressed air, which is fed into the mill through two diametrically, opposed nozzles. The solid feed particles are air entrained through thwe happer in one of the nozzles and are accelerated to relatively great speeds, where they impact at high kinetic energy levels in an impact chamber, where the size reduction is effected by impact, attrition, compression and abrasion of opposing particles. The stream of pulverised particles in fluid suspension is directed tangentially into a statitc classification chamber . The finest particles (from 30to60%) having high ratio of surface to mass, spiral through a central opening in the rear face of the chamber as finished product in suspension. Final seperation from thhe fluid takes place in abag collector or cyclone and challenging vessel. Those particles, which are oversized and have escaped fracture (40 to 70%) continue their path on the periphery of the classification chamber due to centrifugal force. On account of the second nozzle, the oversized product is swept out of chamber tangetially and recycled to the continuous grinding action with new I n feed material on a continuous basis. |
