Processing of rice from paddy to white rice
Harvesting is the process of collecting the mature rice crop from the field. Harvesting operation involves cutting, handling, threshing and cleaning.The harvested grains are then dried. Drying is the process of simultaneous heat and moisture transfer. Once dried, the rice grain, now called rough rice, is ready for processing.The dried grains are stored and are subjected to parboiling where the grains are soaked in water for a particular period of time. Nearly 60% of the total rice produced in India is subjected to parboiling.The soaked grains are then put to steaming . It is then cooled with exhaust fan to remove the extra moisture content. After the grains are dried in bed drier where it is again subjected to steam for 12 hours.
Cleaning and Hulling
Before paddy can be processed in the rice mill, it is necessary to clean the product thoroughly since this improves the quality of the final product. Cleaning involves the removal of impurities and foreign objects such as hey, straw, stone, tree stump, and snail shell, from the paddy.And husking is the rubbing of the excessive husks from the brown rice or cleaned paddy.It is done through the ventilation process. Hulling is the process to remove the hull from the kernel.Hulling can be done by hand by rolling or grinding the rough rice between stones. However, more often it is processed at a mill with the help of automated processes. Hulled rice grains are known as brown rice. The brown rice then passes into the paddy separator which separates any unhulled kernels from the brown rice and recycles them into the huller. Milling is the process which strips off the bran layer from brown rice by air ventilation Brown rice is milled further to create a more visually appealing white rice
Whitening and polishing of rice
During whitening and polishing bran layers are removed from the brown rice.The bran removal is best achieved in several steps to ensure evenly milled rice grains with minimum brokens and optimum uniformity. The whitened rice is then polished to give it a finish up to silkiness.In our rice mill whitening is done twice and silky polishing is done for once.
It is the process by which the milled rice gets separated to mixture of different sizes: whole grain, head rice, and broken rice) by a sieve grader
Optical or color sorting of rice
Optical inspection is the final quality control and enhancement step in the rice mill. Discolored grains and peck defects and foreign material optionally chalky kernels are removed to yield a first grade product. Whether the kernels are processed as brown rice, white rice or par-boiled rice, these sorters add maximum value to the final product. A special color sorter is being used in Sree Muthukumaran modern rice mill is a korean product and it has been introduced for the first time in south India from Korea.
Blending and packing of rice
To achieve a uniform and consistent quality in packed white rice, the various white rice fractions are blended according to the market requirement and trade standards. The marketable white rice is blended packed then stored and are ready for the delivery to the customers either locally or for export