Effects of impeller angular speed variation on particle size reduction of toasted soya bean seeds.
Keywords:
Size reduction, micro mill, soya bean, particle size, angular speed.Abstract
In size reduction, mechanical forces are applied to split a solid structure into collective of pieces without changing
product, the shelf life or process the materials more economically into various end products like meal, flour, feed
and other split products. 2kg of toasted soya bean seeds of moisture content 9.03% (db) were milled using a
designed and fabricated micro-mill at different angular speeds. The speeds ranged from 1000 to 3000 rpm and each
test run lasted 3mins. The milled samples were collected and analyzed. The results showed average particle
diameter obtained ranged from 0.58mm to 0.97 mm while fineness modulus ranged from 4.67 to 6.31. The angular
speed of 2250rpm gave the best average particle diameter 0.58mm and lowest finest modulus of 4.67 for the
intended flour production
