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00:00:00 – 00:12:23
The video discusses the process of corn milling, covering both dry and wet milling methods to obtain corn flour. Dry milling removes the germ, tip cap, and hull to produce endosperm powder, while wet milling further separates endosperm into starch and protein. Modern milling techniques aim to maximize endosperm yield without dark specs. The steps include cleaning the grain, conditioning, degermination, and fractionation. Wet milling involves steeping, germ recovery, size reduction, and separation of components. The ultimate goal is to extract pure starch and protein from corn, known as xen, which has diverse applications. The video concludes by thanking viewers for engaging with the information provided.
00:00:00
In this part of the video, the process of corn milling is discussed. Corn can be consumed in various forms such as corn flour. There are two methods of obtaining corn flour: dry milling and wet milling. Dry milling involves removing the germ, tip cap, and hull from the grain to produce endosperm powder. Wet milling further divides endosperm into starch and protein. Traditional dry milling does not remove the germ, resulting in a 100% extraction rate, while modern milling, also known as deservicing, involves tempering and determining methods.
00:03:00
In this segment of the video, the process of modern corn milling is explained. The main objectives are to remove germs and hulls and obtain the maximum amount of endosperm without dark specs. The operations include cleaning the grain, conditioning with water or steam, and using a degerminator to remove hull, tip cap, and germ, leaving fine endosperm. The degerminator consists of a rotating cast iron conical roller in a conical cage with perforated screens and conical projections.
00:06:00
In this segment of the video, the process of dry corn milling is detailed. Corn grains are cut into pieces, and the germ is released while the size is reduced in a chamber with conical projections. The product passes through a screen and is then dried in a rotary steam tube dryer to reduce moisture. The dried product is milled and sifted, then fractionated into various sizes, with the hull tip cap removed. Additional drying may be done if needed, followed by packing the corn flour product. Wet milling involves removing the germ, hull, and tip cap to obtain pure starch and protein from the endosperm.
00:09:00
In this segment of the video, the process of wet milling of grains is discussed. The first step is steeping, where the grains are treated with high moisture content to soften them. The germ recovery is done using equipment with rotating and stationary plates to expose and skim off the germ. The slurry is then further processed in a boardstone mill to reduce size. Screens separate hull and endosperm particles, but starch and proteins are separated via centrifugation due to their different densities.
00:12:00
In this part of the video, the speaker discusses obtaining pure starch and protein from corn, known as xen. The corn starch has various applications in the food processing industry, providing versatility for different uses. The video thanks viewers for watching and understanding the information.