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Chapter 8: Physical and Mechanical Properties of Rice

Otto R. Kunze (retired), Texas Agricultural Experiment Station and Texas A&M University, College Station, Texas; Yubin Lan, Agricultural Engineering Technology, Fort Valley State University, Fort Valley, Georgia; Finis T. Wratten (deceased), Agricultural Engineering Department, Louisiana State University, Baton Rouge, Louisiana

RICE: Chemistry and Technology, Third Edition
Pages 191-221
DOI: https://doi.org/10.1094/1891127349.008
ISBN: 978-1-891127-34-9


Knowledge of the physical and mechanical properties of the rice grain is used in the planting, harvesting, drying, storing, milling, and processing of rice. Planting, harvesting, and handling procedures and equipment use the physical characteristics of the rice grain to make these operations effective and efficient. The rice industry at all levels is seeking to develop new and better equipment to do specific tasks faster and with greater accuracy.

Much research has been done with masses or bulk volumes of rice in the areas of harvesting, drying, storing, and milling. In all of these, milling quality loss is of great concern and of primary importance. The loss in quality results from individual grains that break.