Question

how is chaff separated from grains​

Answer 1

Answer:

Separating remaining loose chaff from the grain is called winnowing – traditionally done by repeatedly tossing the grain up into a light wind which gradually blows the lighter chaff away. ... Domesticated grains such as durum wheat and common wheat have been bred to have chaff that is easily removed.

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Answer 2

Answer:

How to Separate Seed from Chaff

1st Method

Obviously, if you are growing naked grains, removing the chaff is as easy as described above. Keep in mind that this works best if there is a significant difference in the weight of the seeds and the chaff. A fan will also work to blow the chaff from the seeds. Before winnowing in this manner, lay a tarp on the ground. Place a cooking sheet on the tarp and then from a few feet (1 m.) up, pour the seed slowly onto the baking sheet. Repeat as necessary until all the chaff is gone.

2nd Method

Another method of separating the seed from the chaff is called “roll and fly.” It works best for round, ball-like seeds. Again, it uses moving air to clean the seeds but a fan, your breath, or a cool blow dryer work best. Lay out a tarp or sheet and put a flat box in the center. Put the seed and chaff on a cookie sheet and place the cookie sheet on the box. Turn a fan on so the air blows across it and lift the end of the cookie sheet so the seeds roll down. If need be, repeat until the chaff has blown off. Sieves can also work to winnow the chaff from the seed. Stack the sieves with the largest at the top and the smallest underneath. Pour the seed and chaff mix into the upper sieve and shake it around into the smaller sieve. The smaller sieve should collect the seed while the chaff remains in the larger sieve.