Cryogenic Grinding Essay

3009 Words13 Pages
CONTENTS:- 1. ABSTRACT 2. GRINDING 3. LIMITATION OF CONVENTIONAL GRINDING PROCESS. 4. WHAT IS CRYOGENIC? 5. INTRODUCTION 6. PRINCPLE OF CRYOGENIC GRINDING TECHNOLOGY 7. ITS ELEMENTS 8. DIFFERENT METHOD OF CRYO-GRINDING 9. APPLICATIONS OF CRYO-GRINDING 10. ADVANTAGES 11. LIMITATIONS 12. CONCLUSION 13. REFERENCE 1.ABSTRACT: Cryogenic grinding permits heat-sensitive, thermoplastic, and elastic materials to be economically ground to very small particle sizes. The cryogenic process actually embrittle a material prior to size reduction and controls heat buildup in the grinding equipment. The result is high product quality and system productivity. Cryogenic grinding involves cooling a material below its embitterment temperature with a cryogenic fluid, typically liquid nitrogen or, in certain applications, carbon dioxide. After cooling, the material is fed into an impact mill where it is reduced in size primarily by brittle fracture Cryogenic grinding is used for grinding spices, thermoplastics, Elastomers, color concentrates, and similar materials. It is also used to recover a variety of scrap materials, such as factory scrap rubber and scrap tires, and to separate the components in composite materials. 2.INTRODUCTION: Cryogenic grinding is a method of powdering herbs at sub-zero temperatures ranging from 0 to minus 70°F. The herbs are frozen with liquid nitrogen as they are being ground. This process does not damage or alter the chemical composition of the plant in any way. Normal grinding processes which do not use a cooling system can reach up to 200°F. These high temperatures can reduce volatile components and

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