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Answers
The basic rice milling process goes through the following stages:
Paddy Cleaning – Paddy cleaning is of utmost importance to ensure proper functioning of rice milling machinery. All the impurities like dust, straw, sand, clay, and heavy particles of even and uneven sizes are removed from paddy. Sieves, closed circuit aspiration system, air suction, and de-stoner/gravity separators are used in this stage. Paddy cleaning increases the percentage of oil in bran.
Paddy de-husking/de-hulling – Husk is separated from brown rice/unhusked paddy at this stage, leading to breakage of brown rice.
Paddy Separation – At this stage, a paddy separator separates brown rice from paddy.
Rice whitening – At this stage, the brown rice is rubbed with a rough surface to remove all or part of the brown bran layer. The whitening machines used determine the extent of whiteness.
Rice Polishing – The surface of whitened rice is still rough and is smoothened by removing the remaining bran particles and by polishing the exterior of the milled kernel using a humidified rice polisher.
Rice Grading – This stage involves the separation of broken rice from whole rice by passing the lot through a cylindrical indented screen rotating at a particular speed.The rice should have a minimum number of broken kernels depending upon the requirements of the customers.
Rice colour sorting –After grading, discoloured rice grains are separated from the like coloured grains by rice colour sorting machines.
Weighing and bagging - The final step is to prepare the milled rice for transport by accurately weighing and bagging the rice. Both manual mechanical weighing systems and electronic systems are available.
Parboiling– Parboiling helps to improve the nutritional quality of rice by gelatinization of starch inside the grain. It improves the milling recovery per cent during deshelling and polishing / whitening operation.
Depending upon your requirements, the rice milling process can be one stage, two stage or multistage. The one mentioned above is multistage rice milling process.