Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve. Sieving is used when components of a mixture have different sizes.
In a flour mill, impurities like husk and stones are removed from wheat before grinding it. Usually, a bagful of wheat is poured on a slanting sieve. The sieving removes pieces of stones, stalk and husk that may still remain with wheat after threshing and winnowing.
