9:39 AM | апр. 12, 2018
The intrinsic factors of grain includes, color, composition, bulk density, odor, aroma, size and shape. Color is an important primary factor for characterization and grading, trade, and processing of grain. It is a common criterion used in wheat trade. The main compositions of grain are carbohydrates (energy), protein, lipids, mineral, fiber, phytic acid, and tannins. It varies significant depends on the type of grain, genetics, varieties, agricultural practice, and handling of the grain. Grain composition plays a significant role in grading and marketing of grains. Bulk density is defined as the ratio of the mass to a given volume of a grain sample including the interstitial voids between the particles. Size and shape are important factors in grain quality and grading; it varies between grain to grain and between varieties of the same species. It is commonly used in rice grader and key factors in milling industry. The extrinsic factors include: age, broken grain, immature grain, foreign matter, infected grain and moisture content.
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.
Typically, grass species are annual plants or are herbaceous perennials that die back to the ground at the end of the growing season and then regenerate the next season by shoots developing from underground root systems. Shoots generally are characterized by swollen nodes or bases. Leaves are long and narrow, varying in width from 0.28-0.79 in (7-20 mm). Flowers are small and are called florets. Grasses pollinate by using the wind to widely and opportunistically disperse grass pollen. The fruits are known as a caryopsis or grain, are one-seeded, and can contain a large concentration of starch.
There are three different types of rice: japonica, javanica, and indica. Japonica rice varieties are high yielding and tend to be resistant to disease. Javanica types of rice fall between japonica and indica varieties in terms of yield, use, and hardiness. Although quite hardy, indica yield less than japonica types and are most often grown in the tropics.
rice destoner is used to eliminate the stones, metals, glass & other heavy impurities from the rice. It is based & operates on vacuum principle. Vibrating fluid bed gives floating bounce to the incoming materials and thus pulses is continuously separated from heavier materials on specific weight basis.