sphere grinder machine meghalaya finland

afg | hosokawa alpine

afg | hosokawa alpine

Grinding nozzles arranged around the periphery of the grinding chamber Classifying wheel(s) arranged horizontally in the classifier top section Cool and contamination-free grinding Cleaning made easy by the hinge-back and removable classifier top section and the inspection deck in the mill housing

As ALPINE launched the AFG fluidised bed opposed jet mill onto the market in 1981, it succeeded in revolutionising jet milling. Since then, over 1,000 machines have been sold for a wide diversity of applications.

In jet milling, comminution is exclusively the result of interparticle collision in the gas jets. And because there are no machine components in the grinding zone, neither machine wear nor product contamination occurs. This is why jet milling is often used when contamination-free products are required.

During expansion, the energy contained in the compressed gas in the form of heat is converted to kinetic energy. The speed of sound is initially a natural limit for the exit velocity. But by using Laval nozzles, the exit velocity can be increased to above the speed of sound. Laval nozzles are characterised by their hourglass shape, which widens downstream of the narrowest cross-sectional point, the nozzle throat.

The length of the divergent part of the nozzle is adapted to suit the operating pressure. Compressed air of 20C and 6 bar overpressure is frequently used as the grinding gas, and delivers nozzle exit speeds of around 500 m/s. As a result of drawing in gas and product from the fluidised bed, the speed of the gas jets sinks extremely rapidly after exiting the nozzles. Comminution is a result of interparticle collision in the jets of air and also in the core area, i.e. the point where the opposing jets intersect.

Jet mills are impact mills which are used to achieve maximum fineness values at maximum product purity. Such particle sizes can only be obtained in connection with an air classifying step. Spiral jet mills have a static air classifier integrated into the mill housing, whereas fluidised bed opposed jet mills are equipped with a dynamic deflector-wheel classifier.

The fineness is set as a function of the classifying wheel speed. All-important is a high product loading of the nozzle jets in order to achieve a high concentration of particles and thus high impact probabilities. The patented Megajet nozzles were developed with this in mind. They consist of four small nozzles which as a result of their close proximity generate an underpressure at their common centre, and thus draw particles from the fluidised bed direct into the centre of the nozzle jet. The product level in the machine is controlled by means of load cells or by monitoring the current loading of the classifier drive.

Single-/multi-wheel classifier headMonobloc ceramic classifying wheels ensure minimum wear when processing abrasive productsLining: PU, ceramic or special-grade steel to suit the productStainless steel or mild steel, Ni alloyHorizontal or 3D nozzle arrangement, Megajet nozzlesSelective milling, semi-batch mode, automatic quality control for high qualityLoad cells for product level controlMaterial feed via a feed metering system into the classifier head or direct into the milling chamber, or injector feedExplosion-pressure-shock-proofPharma design up to machine size 630/1 AFG, steep particle size distribution, high bioavailability for active substances, minimum off-spec batches, low manpower requirementHot-gas mode for mineral products permits cost-effective manufacture of large amounts of ultrafine mineral powdersCircuit-gas systems for pyrophoric products provide maximum safetyIf frequent colour change is necessary, the TFG for coloured toner reduces the costs and ensures optimum throughput rates

Heat-sensitive materials such as toner, resin, wax, fat, ion exchangers, plant protectors, dyestuffs and pigmentsHard and abrasive materials such as silicon carbide, zircon sand, corundum, glass frits, aluminium oxide, metallic compoundsHighly pure materials where the requirement is contamination-free processing such as fluorescent powders, silica gel, silica, special metals, ceramic raw materials, pharmaceuticalsHigh-performance magnetic materials based on rare earth metals such as neodymium-iron-boron and samarium-cobalt. Mineral raw materials such as kaolin, graphite, mica, talcSelectively ground composite materials such as metal alloys

spherical manufacturing | edmund optics

spherical manufacturing | edmund optics

Edmund Optics manufactures millions of stock and custom precisionspherical lenses for applications in the Advanced Medical Diagnostics, Testing & Measurement, Semiconductor, R&D, and Defense markets around the globe. Singlets, doublets, and triplets from a wide range of Schott, Ohara, and CDGM glasses are manufactured and coated in our state-of-the-art facilities in Japan, Singapore, and Barrington, NJ. Whether your application calls for stock components from our vast inventory, a build-to-print lens, or a fully customized design effort, our expert optical design and manufacturing engineers can develop solutions to meet your needs. Contact us today to speak with an expert or receive an expedited quote.

Edmund Optics is a leading manufacturer of spherical lenses, producing millions of precision quality lenses every year. Whether you require small quantities of spherical lenses for prototyping, a few dozen for pre-production, or large volumes for full-scale production, Edmund Optics has the capabilities to ensure the success of your projects.

Edmund Optics has the expertise to provide stock and custom spherical optics. Our specialty is plano-convex (PCX), double-convex (DCX), plano-concave (PCV), double-concave (DCV), and achromatic lenses.Contact uswith your requirements and our expert staff of optical manufacturing engineers will work closely with you to make sure we deliver spherical optics that meet your system's needs within your budget constraints.

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