Structure and function
Both trays and fans are made
basically by forming a woven mat into the desired shape. The trays have a strengthened rim
that holds the mat all along the periphery of the form .The fans have one side of the mat
tree of the rim and the grain is poured out from this side .
The trays are generally used for
drying grain ,or are held horizontally and moved in a sidewise motion so that the grain is
separated from the chaff. Both the trays and fans may be held horizontally and jerked
upwards repeatedly to separate the grain .The fans are also used by tilting them gently
towards the ground so that the grain, due to its weight, falls into a pile while the
chaff, with the help of a gentle breeze, is blown into anther pile.