Rice grader are used for separating milled rice or coarse rice according to size differences of rice to achieve further progressing. It can finish high quality and larger capacity rice production by four rice graded classes. This rice grader is not only widely applied for rice, but the other grains in rice milling production line or grain processing industry.

As a main source of nourishment for over half the world's population, rice is by far one of the most important commercial food crops. Its annual yield worldwide is approximately 535 million tons. Fifty countries produce rice, with China and India supporting 50% of total production. Southeast Asian countries separately support an annual production rate of 9-23 million metric tons of which they export very little. Collectively, they are termed the Rice Bowl. Over 300 million acres of Asian land is used for growing rice. Rice production is so important to Asian cultures that oftentimes the word for rice in a particular Asian language also means food itself. Rice is a member of the grass family (Gramineae). There are more that 10,000 species of grasses distributed among 600 genera. Grasses occur worldwide in a variety of habitats. They are dominant species in such ecosystems as prairies and steppes, and they are an important source of forage for herbivorous animals. Many grass species are also primary agricultural crops for humans. As well as rice, they include maize, wheat, sorghum, barley, oats, and sugar cane.

The flow of processes in a typical modern rice mill: (1) paddy fed into the intake pit; (2) precleaned paddy moves to the rubber roll husker; (3) mixture of brown rice and unhusked paddy moves to the separator; (4) unhusked paddy is separated and returned to the rubber roll husker; (5) brown rice moves to the destoner; (6) destoned brown rice moves to the first stage (abrasive) whitener; (7) partially milled rice moves to the second stage (friction) whitener; (8) milled rice moves to the sifter; (9a) (for simple rice mills) ungraded milled rice moves to bagging station; (9b) (for more sophisticated mills) milled rice moves to the polisher 1; (10) polished rice moves to length grader; (11) head rice moves to head rice bin; (12) broken rice moves to brokens bin; (13) pre-selected amount of head rice and broken rice moves to blending station; (14) custom-made blend of head rice and broken rice moves to bagging station; (15) bagged rice moves to the market; (A) straw, chaff, and empty grains are removed; (B) husk removed by the aspirator; (C) small stones and mud balls removed by destoner; (D) coarse (from first whitener) and fine (from second whitener) bran removed from the rice grain during the whitening process; and (E) small broken rice/brewer's rice removed by the sifter.

Conventional rice grader: Conventional rice graders are the units, in which the paddy processing is carried out by using steel hullers, an age old technology which is inefficient. Different activities like cleaning, drying, grading, polishing etc. are carried out manually. Modern rice mills: Modern rice mills are the units, in which the paddy processing is carried out by using rubber roll shellers, a modern technology which is more efficient. Majority of the activities are carried out using machineries like driers, aspirators, graders, polishers etc. Different stages of paddy processing in commercial rice mills are followed viz., parboiling process, drying of parboiled paddy and finally milling operation to get finished product.

Rice destoner is used to remove heavy particles stones from wheat and other cereal grains like maize, paddy, rice, wheat, etc. Grading cereals can be done effectively.

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