Cryogenic Machining Essay

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Cryo-Grind Size Reduction Systems For fine grinding plastics and pigments Products’ Cryo-Grind systems perform three essential tasks in the efficient particle size reduction of all types of plastics and pigments: Cryogenic grinding Grinding tough, thermoplastic materials – polypropylene, nylon, powder coatings etc. – at cryogenic temperatures ensures that plastics are brittle enough to be ground below 300 micron particle size: and even down to 50 micron and below with the improved new Cryo-Grind systems. Temperature control Materials normally brittle enough to grind at ambient temperatures can start to degrade when the ambient temperature rises i.e in summer, during processing or if throughput increases are required. Cryo-Grind systems inject controlled amounts of liquid nitrogen to regulate the heat of the grinding process and allow higher material throughputs at any time of the year. Inert grinding Organic materials (especially pigments) have an increased risk of explosion when very fine particles combine with air and the heat of the grinding mill. The use of nitrogen to make the atmosphere inert reduces the possibility of this occurrence. Cryo-Grind process is not new, but the made by Air Products – working in conjunction with grinding mill manufacturers all over the world – mean that the nitrogen ratios and particle size distribution are now better than ever. Advantages • Smaller particles Plastics and pigments can be introduced into high performance materials with improved mixing and better final material quality • More uniform particle size distribution Cryogenically ground materials have a narrower, more consistent size distribution and unproved surface characeristics • Efficient process Nitrogen usage is minimised and throughput maximised by using Air Products’ Cryo-Grind systems • Process cooling/temperature

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