Rice processing


Routine milling A total of its processing flow of clean […]

Routine milling
A total of its processing flow of clean-up, Hut Valley, Valley rough separation, rice, rice grazing, grading 6 procedures, three kinds of intermediate products that net Valley, net brown rice and white rice. Cleaning is to remove the debris in the rice. Commonly used cleaning methods are wind election method, screening method, the proportion of sorting and magnetic separation method.
Hysteria and rice husk separation is the removal of husk and separation. The most commonly used tuna equipment is a rubber roller trowel (China sand trowel trough machine has rarely used), the basic working part is a pair of flexible rubber roller or polyurethane rubber roller, the two rollers at a certain line speed Poor relative rotation, take off the rice husk.
Chrysalis separation is based on the Chrysanthemum Valley products rough mixture of selected pure brown rice. The average length of rice is 2 ~ 2.2mm larger than that of brown rice, and the width is 0.2 ~ 0.6mm larger than that of brown rice. Compared with rice, brown rice has higher density, smaller friction coefficient and lower elasticity. The basic principle of grain-rough separation is to make full use of the differences of these physical properties so that they produce a good automatic classification during the course of movement and are sorted by sieving or other forms of separation. There are three types of Valley rough separation: According to the particle size and the difference between the coefficient of friction sorting; According to the density, the friction coefficient differences in sorting and according to the elastic, density differences in sorting.
Milling rice is crushed brown rice cortex to improve their food quality. Milling rice as much as possible to maintain the integrity of rice, reducing broken rice, rice rate increase. Mechanical rice is divided into white grinding and milling grind white two. Rub off white grinding white room pressure, prone to broken rice, but finished rice surface smooth, good color; grind white mill white room pressure is smaller, less broken rice, grain surface finish and color are poor. Can be used to grinding based, rubbish supplemented by the mixed mill white. There are only a few theory of milling white rice milling machine, rice fluid theory in China is closer to reality. China's NS-type sand roller rice milling machine applied this theory. The surface of the cylindrical roller has three spiral grooves equidistantly deformed. The depth of groove gradually decreases from deep to shallow at the inlet end to the outlet end of the grinding chamber, and the groove width gradually becomes narrower. Characteristics are white uniform, a high rate of rice.
Wipe rice is to remove the sticky rice bran powder surface, improve the surface finish and color. Commonly used wipe rice machine brown palm, leather or rubber made of rice rolls, iron roller more used in China, and often combined with the rice milling machine, such as the NS-type sand roller rice machine.
Grading is based on the finished product grade standard separation of ultra-standard broken rice. Mainly the use of broken rice and the whole length of the difference between rice and sports in the classification of a certain degree of separation. Most of Europe used pocket roller sorting machine and disc selection machine, some countries in China and Asia to use multi-layer sieve grading machine.
Special rice
Compared with the conventional rice milling, the finished product has different properties and uses different processing methods. Mainly deep grind, half boil, water seepage, wet rubbing and surface starch membrane and other methods.
Deep grinding is the conventional rice milling produced around the special layer of rice grind down to get high protein rice flour. The protein content of 12 to 22%, fat, vitamins, nicotinic acid, phosphorus and calcium content higher than the original rice.
Half boiled rice is a hydrothermal treatment method. The processing is soaking, steaming, drying and milling rice or brown rice. Half boiled role: ① water-soluble vitamins and mineral salts spread throughout the grain, so that the content of vitamin B1 and B2 4 times higher than white rice, niacin 8 times higher. ② rice starch in the gelatinization of part of the endosperm strong, increase the rate of rice. ③ rice kernels part or all of the purified, microbes and eggs are killed, preventing worms, prolong storage time. ④ Preparation of food, dry matter loss reduced. Nowadays, from the perspective of strengthening the nutrition of rice in the world, more and more attention is paid to the advantages of Item ①.
Water seepage rice, wet friction rice and surface starch film processing methods such as not to wash rice. Do not wash rice is no need to pan wash white rice. White rice panning, the loss of bran powder, starch and other solids about 3%, about 30% of vitamins, as well as iron, calcium and so on. Not panning rice processing can be used to brush these nutritious bran powder for other purposes. And avoid the loss of vitamins when panning.