Low temperature milling can reduce the crushing rate of rice

2021-10-26

 Reducing broken rice rate is what the rice mill equipment upgrade has been trying to do. The whole rice rate is the top priority in the comprehensive economic benefits of rice processing. The higher the temperature in the rice mill, the more broken rice will be produced, which is a common phenomenon in rice mills now. Low temperature rice milling can reduce the broken rice rate. In the process of rice milling, the surface of rice grains ground by sand roller to remove the furfur layer and the surface of rice grains in the grinding chamber subjected to friction and collision will generate a lot of heat, which will increase the surface temperature of rice grains.

Due to the poor thermal conductivity of rice grains and the slow transmission of surface temperature to the interior of rice grains, a temperature gradient (temperature difference) will be formed from the outside to the inside. A large temperature difference will result in the thermal stress inside rice grains, and the thermal stress exceeding the inherent strength of rice will lead to the rupture of rice grains or the bursting of the waist. The structure of the traditional rice mill determines that the white room of the rice mill has a large ventilation resistance and a small amount of air passing through. It is an effective method to reduce rice milling at low temperature and restrain rice temperature rise.

By increasing the air flow through the white milling chamber, the rice can be raised at low temperature and the rice milling rate can be improved. Low-temperature rice milling is to use the wind sprayed into the white room through the rice layer to remove the heat generated by grinding to inhibit the high temperature rise of the rice. Therefore, the key technology of the low-temperature rice milling machine is to increase the air pressure and air volume of the rice machine's built-in blower, reduce the air resistance of the spray into the front section of the white milling room and increase the air volume of the white rolling area per unit output.