Grain Clean the grain to remove chaff and light impurities. Maintain genetic purity by preventing mixing or contamination with other seeds. Depending on the available equipment, the cleaned grain is further processed to separate slim grains in a thickness seperator such as a slotted screen or thickness grader, and a length grader such as an indented cylinder. Principles of Cleaning The separation of undesirable material and seeds from desirable seed in an air screens machine is done on the basis of differences in seed size and weight. Screen machine uses three cleaning elements. Aspiration The light seeds and chaff material is removed from the seed mass through aspiration. Scalping In this operation, the seeds are dropped through screen openings, but the larger material (trash, clods etc.,) is carried over the screen into a separate short. Grading In this operation, the good seeds ride over screen openings, while smaller particles (under sized, cut, shriveled, broken seeds) drop through. Cleaning Equipment The air screen cleaner It has the following main components: Feed Hopper, Screens, Square mesh, Rectangular mesh, clay-crushing rolls, brushes, tappers & shoes.

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