Milling and sifting are the 2 key processes in maize milling plant, in the production of different maize flour products, milling degrees are different due to the maize miller, and after each milling process, sifting is the process that followed to separate the flour particles from other impurities. The mixture contains bran, corn residue, maize flour, etc. The other impurities are conveyed to the specific equipments for other products manufactures. The sifter work principle is through the  vibrating at a certain frequency, in the maize milling plant, it might has several layers and with a air flow which can make the mixture layer more even.   More Milling and Sifting Processes could produce deep processed maize flour, but in most cases, it is not necessary, there are disadvantages of nutrition loss and reduction of corn flour, more importantly, it could increase the power consumption in maize flour milling process. The small set of flour grinding machine manufactured by AGICO could satisfy the basic requirements of most flour products, if you are interested, please contact us now!