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Cleaning and Grading of Paddy

Cleaning and Grading of Paddy. Next. Cleaning and Grading of Paddy. Introduction. After harvesting of Paddy from field, generally it is associated with contaminations and impurities. .

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Cleaning and Grading of Paddy

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  1. Cleaning and Grading of Paddy Next

  2. Cleaning and Grading of Paddy Introduction After harvesting of Paddy from field, generally it is associated with contaminations and impurities. Cleaning and Grading of Paddy plays important role in improving the quality of rice as well as safe storage. Harvested Paddy with Contaminants Next End

  3. Cleaning and Grading of Paddy Introduction Cleaning Cleaning of paddy refers to removing of immature, unfilled and non-grain materials Separation and grading grain is brought to the desired quality standards Next Previous End

  4. Cleaning and Grading of Paddy Importance Value addition & to improve marketability Safe storage Enhance longevity Efficient material management Better quality of processed product Eliminates chances of choking as well as wear and tear of machines during further post harvest operations Fetch higher economic returns Next Previous End

  5. Cleaning and Grading of Paddy Cleaning of Paddy It consists of following 2 steps: Pre-cleaning & Basic Cleaning Pre-cleaning Removal of coarse contaminants - trash, beard, earth balls, stone, plant parts etc. Improves capacity & precision of further processing. Next Previous End

  6. Cleaning and Grading of Paddy Basic cleaning: Cleaning of Paddy Removal of all other materials including inert matter, common weed seed, noxious weed seed, other crop seed, deteriorated seed, other variety seed, damaged seed, off-sized seed Next Previous End

  7. Cleaning and Grading of Paddy Methods of pre-cleaning Principle: lighter materials are blown away by air Removes chaff, straw and empty grains Does not work for materials heavier than grain (dirt, stones) Hand winnowing Next Previous End

  8. Cleaning and Grading of Paddy Methods of pre-cleaning Mechanical winnowing Next Previous End

  9. Cleaning and Grading of Paddy Machines for cleaning and Grading of paddy Air screen cleaner separation is based on size (thickness) and aerodynamic behavior Component: Screening Unit Aspiration Unit Next Previous End

  10. Cleaning and Grading of Paddy Working Mechanism of Air-Screen Cleaner Scalped off material (Trash) Under size material Lighter impurity Cleaned Material Next Previous End

  11. Cleaning and Grading of Paddy Screen Selection Next Previous End

  12. Cleaning and Grading of Paddy Indented cylinder separator It consists of indents which lift particles that fit into the indents. Particles which do not fit drop out of the cell and fall downwards. • Grade sample lot according to length & removes cut grains as well as weed seeds Indents Next Previous End

  13. Cleaning and Grading of Paddy Trough Liftings Trough Indented cylinder separator Working Mechanism Small Grain Pocket Long Grain Indented Cylinder Next Previous End

  14. Cleaning and Grading of Paddy Feed Deck Air Flow Heavy Medium Light Specific Gravity Separator Separation on the basis of density by flotation Deck Oscillating unit Air blowing unit Differential air control Differential inclination Control Components Next Previous End

  15. Cleaning and Grading of Paddy Feed Rock Light Discharge Edge Stones Trash Clean Seed Insect Damage Specific Gravity Separator Working Mechanism Slope tends to stratification while Oscillation controls movement. Seeds fed on the table in 3-5 seed thickness. The shaking deck pushes the heavy seeds uphill with deck and air stream float lighter seed. Next Previous End

  16. Cleaning and Grading of Paddy Specific Gravity Separator Even after the seed is cleaned in the air-screen cleaner and the indented cylinder, it may be necessary to obtain higher-quality seed. In such cases, the seed can often be passed over the specific gravity separator Next Previous End

  17. Cleaning and Grading of Paddy Spiral Separator Separates on the basis of differences in sphericity (rolling resistance) Used to separate round materials from the admixture of round & flat Next Previous End

  18. Cleaning and Grading of Paddy Color sorter Separates the discoloured materials Discolouration occurs due to insect invasion, disease infection and weathering effect Next Previous End

  19. Cleaning and Grading of Paddy Color sorter Working Mechanism Next Previous End

  20. Cleaning and Grading of Paddy De-awner Removal of appendages for ease in mechanical operations • Paddy cultivar e.g. PUSA Basmati -1 contains awns which must be removed for efficient mechanical handling Next Previous End

  21. Cleaning and Grading of Paddy Grading factors for paddy Moisture content Impurities and foreign matter Seeds and foreign matter in test milled rice Red grains and red streaks in test milled rice Chalky and immature grains in test milled rice Damaged grains in test milled rice Foreign grains in test milled rice Milling yield (total) in test milled rice Milling yield (head rice) in test milled rice The grade of the paddy is designated on the basis of the results of analyzes and observations and on a comparison with the requirements of the standards. Previous End

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