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TIME:2014-10-31 10:18:29FROM: AUTHOR:
Press: Preparation Methods fats are pressing, extraction and water generation method. According to the press law and the production scale equipment used can be...

Press: Preparation Methods fats are pressing, extraction and water generation method. According to the press law and the production scale equipment used can be divided into virgin wood, spiral hydraulic pressing machine pressing. Since the preparation of corn germ oil are mostly carried out by the smaller and auxiliary plant, so the use of screw press is most appropriate.

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Production scale models can be, slightly larger scale production plant, the choice of joint steaming and roasting equipment assembly 200 screw press, both steaming and roasting machine, continuous operation, the use of simple, solid embryo steamed fried, pressed oil once a group of devices is completed. When steaming fried parison temperature reaches 115-120 ℃, the moisture content of 2% to 4%, the direct access to press oil extraction. At this temperature required to maintain 30-40 ℃, initial embryo into a small amount of material until after the normal operation of pressing machine, pressing the chamber temperature rises, and then increase to the standard amount of feed, and maintain a uniform feed, the oil and the cake, to be able to smell the aroma cake, pie slice solid, smooth surface, the back of the cracks, the oil normally prevail. If the low temperature steaming and roasting the high moisture content of the material embryo, pie slices soft, moisture is very strong, oil color is not correct, white foaming, the oil is reduced. If steaming and roasting temperature is too high, too low moisture content of the material embryo, the cake color too deep, export risk of smoke and burning smell, oil color depth, the oil is reduced.
Pressing machine functioning, general oil extraction speed control for 8 turn / min, feed embryos by press time virgin bore for 2.5min, cake slice thickness of 5-6mm. Production of corn grits corn germ oil extraction rate of 22% -26%; Preparation of starch extracted from corn germ oil yield was 25% -28%, the residual meal rate of 5% -6%. The preparation of corn germ oil, not refined commonly known as "crude oil", the moisture and volatile matter 0.3%, 0.2% impurities, acid value 6, precipitate 6%, light yellow color, smell normal, heated by 280 ℃ there precipitate precipitation. "Crude oil" because of the high moisture and impurities and intolerance storage, after the subject of hydration, alkali refining and deodorization refining, in order to obtain high-quality refined corn oil.