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Mill Grinding
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By Vivekavardhan.r 10e11a03b5
OBJECTiVES INTRODUCTION PROBLEMS IN CONVENTIONAL GRINDING WORKING ADVANTAGES OF CRYO GRINDING EXPERIMENTAL STUDIES APPLICATION
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CRYOGENICS The term “ Cryogenics” originated from the Greek word which means creation or production by means of cold. Cryogenics is the study of very low temperatures or the production of the same.. Liquid nitrogen is the most commonly used element in cryogenics and is legally purchasable around the world.
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In Rocket In Biology In Food Industry In Electronics In Medicines In Grinding
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GRINDING The process is carried out with a grinding wheel made up of grits for removing materials from work piece surface. Grinding can be classified into two types •
Grinding for material removal
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Grinding for powdering
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PROBLEMs IN CONVENTIONAL GRINDING PROCESS •
High heat generation
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Tensile residual stress are induced to the material
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Less tool life
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Clogging and Gumming of the mill
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Oxidation
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Loss of Etheric oil in Spice grinding
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Now….elimination of all these problems are required…….. But……….
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Here comes the necessity of
CRYOGENIC GRINDING …..also known as Freeze Grinding
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CRYOGENIC GRINDInG
Cryogenic grinding involves cooling a material below its embrittlement temperature with cryogenic fluid. Typically Liquid Nitrogen or in certain applications, liquid Carbon Dioxide is used.
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This process has several benefits
Ability to process soft or elastic material
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Increased productivity
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Low Power Consumption
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Smaller size particle
Minimal loss of volatile component
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WORKING
06/09/2010
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ADVANTAGES OF CRYOGRINDING Increased throughput & power saving Finer particle size More uniform particle distribution Lower grinding cost No heat generation Provides an inert atmosphere Reduced grinding force Provide clean and pollution free environment Prevent oxidation Possibility of fine grinding of difficult spices
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RESULTS OF EXPERIMENTAL STUDIES 1. Volatile oil content & flavor component Example : pepper SL No.
