Threshing, Winnowing and Sieving

Transcript

How is Wheat Flour obtained from Wheat Crop?HARVESTING Wheat crop cut DRYING (SUN-DRYING) Moisture removed from grains THRESHING Grains separated from stalk WINNOWING Husk separated from grains GRINDING Grains ground into flour SIEVING Bran and small impurities removedWhat is Threshing?The process where Stalks are beaten to separate Grains from them is called Threshing What does Threshing do?Stalks Removed Grains with Husk (This we throw) (This we use in Winnowing to remove Husk) What is Winnowing?The method of separating lighter husk from heavier grains by wind or blowing air is called Winnowing What does Winnowing do?Grains with Husk Removed Grain without Husk (This we Grind and later Sieve) What is Sieving?The process of separating solids from a mixture based on variations in particle size using a sieve is called sieving What does Sieving do?Flour with Small Impurities Removed Fine Flour (This we used for Cooking) Which all Processes are Separation covered here?Threshing This is Separation of Grains from Stalk Winnowing This is Separation of Husk from Grains Sieving This is Separation of Small Impurities from Flour What are Threshers?Nowadays, machines are used for separating grains from the stalks and husk. These are called Threshers. They perform both the tasks of threshing and winnowing simultaneously.