Rice milling is the process of peeling off all the skin layer on the surface of brown rice, while maintaining a certain processing accuracy and keeping the rice grains as complete as possible.
The purpose of rice milling:
The cortical tissue of brown rice contains more crude fiber, which is not easy to digest when eaten directly. At the same time, brown rice has poor water absorption and swelling, and has poor edible quality. Brown rice cooking not only has a long cooking time, but also has a low cooking rate, and has a dark color, poor viscosity, and bad taste. Therefore, the brown rice skin must be removed through the rice milling process in order to improve its cooking and edible quality and increase its commercial value. However, when all the brown rice cortex is removed, these nutrients, such as starch, fat, protein, minerals and vitamins, will be lost when the brown rice cortex is completely removed. At the same time, according to the structural characteristics of brown rice grains, the cortex at the back groove is completely removed, which will inevitably cause the loss of starch and increase the crushing, resulting in a decrease in the rice yield. Therefore, according to market demand, rice milling matters are not only beneficial to the nutrition and health required by the human body, but also can improve the cooking and eating quality of rice and its yield, and realize the scientific and sustainable utilization of rice resources.
Basic requirements for rice milling:
Under the premise of ensuring that the processing accuracy of the finished rice meets the prescribed standards, as far as possible to keep the rice grains intact, reduce broken rice, increase the yield, improve purity, reduce power consumption, cost and ensure safe and stable production.
Rice milling machine is a method of peeling and whitening rice milling by using the mechanical force generated by mechanical equipment, and the mechanical equipment used becomes a rice milling machine. The main working part of the rice mill is the roller. According to different manufacturing materials, rollers are divided into three types: iron bars, sand rollers, and sand iron. According to the installation form of the roller shaft, the rice mill is divided into vertical rice mill and horizontal rice mill. According to the number of rollers, rice mills can be divided into single-roller and double-roller or three-roller combined rice mills.
Rice milling process
The main task of the rice milling section is to mill off most or all of the skin layer on the surface of brown rice to make finished rice that meets the standards. Because rice milling directly processes rice grains, it directly affects the yield and quality of finished rice.
The rice milling section is mainly divided into two parts: rice milling and finished product processing. It goes without saying that whitening brown rice is the most important process in the rice milling section. After the rice is milled, the surface of the rice grains is often sticky with bran powder, broken rice is mixed between the rice grains, and the temperature of the machined rice is high, which is not conducive to storage. In addition, when processing high-quality rice, it is necessary to polish the surface of the rice grains to remove heterogeneous rice grains such as yellow grain rice. So after the brown rice is milled, it must be processed.
Tips-how to choose rice milling equipment
The tasks undertaken by each process of the rice mill are completed by the certain processing equipment. Appropriate selection of equipment should not only directly affect the technological effect, but also affect the economic and technical indicators of the rice mill. When selecting equipment, according to the collected and collated data, try to use advanced equipment with good process effect, simple structure and convenient operation. According to the characteristics of raw grain and the requirements in the technological process, priority is given to standardization, serialization and generalization of equipment. Under the condition of funds permission, some host equipment, especially rice milling and finished product processing equipment, can also be introduced appropriately. When selecting equipment, the material delivery method should also be considered.
When pneumatic conveying is used, the role of multi-purpose air should be considered, so that the role of wind cloud equipment (receiver, unloader) can replace part of the processing equipment, and simplify the parts of some equipment that require air suction to save power and reduce materials. And material consumption. In addition, the selection of equipment should also consider the requirements of equipment layout and operation, in order to facilitate other designs after the completion of the process design, so that the new plant or remodeling plant can achieve safe production and civilized production.
