How to Press Soybean Oil By Screw Oil Press?


Soybean belongs to low oil crop, and the content of soybean oil is 11%-20%.  In general, the moisture content of soybean is 13%-14%. Before oil extraction, screen is used to remove impurities. Oil extraction methods include hot pressing and cold pressing.

1.Hot Pressing


Technological process: soybean-cleaning-fraction(Roughing)-soften-flaking-cooking-pressing
Operating instructions:First, with 12 mesh / inch screen screen cleaning, make the impurities content is less than 0.1%, and then put it into the crusher, crushing degree of 2-4 flap, then softening, reduce the water content of soybean at around 15%, the softening time of 40-50 minutes, now flaking. There are two points in the role of the embryo: First, the destruction of cell tissue so that oil flow from the cell easily, Second is the grain of the seed oil rolled into a sheet, the surface area increases, thereby increasing the oil area, and greatly shorten the distance away from the embryo oil; Then make soybean embryo into the steaming pot for steaming, steaming and stir fry the soybean water in 1.5 - 2.8%, the temperature in the degree of 100-110 can begin to enter the oil press to press. The cake thickness control in 1- 1.5 mm.

2.Cold Pressing


Soybean cold pressing can carry out the whole seed press, the whole seed pressing need to strictly control the water, the general control in 8%-10% or so, and pay attention to the oil press heating, standby temperature rise to 80 degrees, it can be pressed.

Artificial inspection method for moisture content of soybean during cold pressing:
Bite with the front teeth can be chopped, molar bite flat, and the surface cracks, there is a slight noise is appropriate; If the flat shape, no crack is too wet, if a bite has a lot of noise, it is too dry, the need to adjust the amount of water can be pressed.




3.The Problem of Pressing Soybean in Screw Press

The use of screw press to press the soybean oil, regardless of cold pressing or hot pressing, due to improper operation or oil moisture content adjustment is not appropriate, there will be different problems.


A.The phenomenon of slag formation during pressing:
Spiral oil press, in the crushing of oil, if a small amount of slag running phenomenon, also belong to the normal phenomenon (run slag allowed up to 5%). If you run a large amount of slag, you need to adjust. From the perspective of oil, oil containing water properly, too dry or too wet, can run slag, oil is too wet, a row of running check for sheet, the cake is soft hand grip into ball shape, with white foam oil flow. If oil is too dry, ran a row of slag powder, white cake into a powder, which impeded the flow of oil, squeeze-bore gap should be less.

B.Soybean oil return phenomenon:There is oil in the hopper. In the case of pressed soybeans, there is little return to oil, because oil recovery is a phenomenon that is easy to produce when the oil is high. This is usually because of the small gap.

C.The cake is not smooth, or no cake, nor feed: press neither feed nor cake phenomenon, mainly is the begining of the new machines available, without running, due to improper use. At the same time, the hopper is blocked, which causes the material to be turned on the blade to causes the materian to be turned on the blade to cause the material to be fed, and the moisturs content of the oil shoild not be adjusted. If you do not belong the water problem, the new machine when used, shall be instrice accordance with manual operation, should slow the feed control, standly when the temperature reached 80 degrees above normal press to enter.



  

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