The color of rice is an important indicator of its quality. For consumers, rice is more white and more like it, which leads to the market price will also rise. The color of rice is affected by many factors. In addition to quality, it is also influenced by the degree of grinding of rice. The higher the grinding degree of rice is, the less the residual powder on the surface is, and the whiter the rice is. The milling degree of rice is usually represented by the mass fraction of ground meal that is removed by grinding and the total mass of brown rice. It can also be represented by the mass ratio of rice before and after grinding. In order to study this conclusion, it is verified that the rice mill can achieve its proper function during the experiment.
The grinding degree of rice is an important indicator to determine the accuracy level of rice. It not only has an important influence on the rice's sensory quality, starch gelatinization temperature, rice production rate, and pest occurrence rate, but also significantly affects the energy consumption of rice processing. . As many nutrients such as fats, minerals, and vitamins of rice concentrate mainly on the surface of rice, these nutrients are lost in large amounts as milling progresses. Increasing the degree of grinding of rice, although it can increase the whiteness of rice and obtain better economic benefits, it will also significantly reduce the nutritional value of rice and increase the energy consumption of rice processing. Therefore, the moderate milling of rice, in order to obtain a satisfactory whiteness of rice, while minimizing the nutritional losses of rice, has great economic and social value for the rice processing industry.
By examining the color analysis of rice grains processed by rice milling machines, the complex relationship between the color of rice and the degree of milling is present. The current study is not yet deep enough and comprehensive. To accurately understand the variation of surface color of rice in rice milling process It is also necessary to carry out an in-depth study on the relationship between the color of rice and the degree of milling, and give a mathematical model of its relationship in order to provide reliable information for the operation adjustment and automatic control of rice milling process and equipment. Milling time has a significant effect on the color of the rice surface. As the milling time is extended, the surface lightness (L) value of the rice first increases rapidly, then the increase gradually slows down, while the red-green tone (a) value and yellow blue The hue (b) value gradually decreases as the milling time increases. With the extension of milling time, there are significant differences between the color characteristics of three varieties of rice.
Using the rice grains tested by the rice mill for comparison, the surface lightness (L) value of rice linearly increases with decreasing whiteness, and the red-green and yellow-blue values ​​of rice surface along with roughness. The reduction of the whitening rate is linearly reduced; the relationship between the L, a and b values ​​of the surface color of the rice and the whitening rate of roughness can be described by a linear function: y=bo+b,x. Under the same grinding degree, there are significant differences between the surface color characteristics of the three varieties of rice.
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