For obtaining starch from corn , the important thing is to release the starch from the cell structure in particular, without damaging the germ and thus to obtain extracted corn starch with minimum possible fat content.
The main mature process for corn starch production called wet-milling process. The goal of corn wet-milling process is to change corn into its four main components, starch, fiber , germ and gluten, then convert the components into useful products.
Below we tried to explain corn starch production process in more details , for more technical information on the process, our engineers will design the best solution for you.
Received corn must be cleaned to ensure it is free of dust, sand, metal and other impurities. After cleaning, it is soaked in water at a certain temperature around 50˚C for around 42 hours. During steeping, the kernels absorb water and get more than double in size. The gluten bonds in the corn loosen and starch is released. The water that the corn soaked in, referred to as steep-water, contains much of the soluble material from the corn, including a significant percentage of proteins and sugars. The corn after steeping is ready for further process.
The corn is coarsely milled in disc mills to separate the germ from starch, gluten and fiber. This generally happens in two stages. Each stages gave been designed to separate germ for other corn components. Two disc mills are employed for this purpose along with two germ separation hydro cyclones to separate germ with no damage.
The corn grit passing the underflow of the second germ hydro cyclone unit is pre-dewatered on gravity arc screen. The screened off milk flows directly as mill starch milk to starch / gluten separation.
The mill starch milk from grit milling and fiber washing is free of germs and fiber, but still contains besides Starch granules suspended material as insoluble protein (gluten), fat and hemicellulose materials. Furthermore soluble and colloids are in the starch milk.
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