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　　 Soybean puffing process is mainly through the physical effects of temperature, humidity, pressure, exercise, etc. to achieve the purpose of changing the characteristics of soybeans. Puffing processing technology is a high temperature and short time processing technology, which can maximize the utilization efficiency of nutrients, avoid the loss of nutrients, and give full play to the nutritional efficiency of soybeans.

The advantages of puffing process are as follows:

　　1. Puffing can further destroy the tissue structure of soybeans, making the oil easy to be leached by soybean oil extraction equipment.

The fat in soybeans exists in soybean tissue cells surrounded by protein molecules and other components in soybeans. The original tissue structure must be destroyed as much as possible before immersion, so that the fat and the solvent are in direct contact to make it smoother The ground dissolves in the solvent, and the puffing process happens to be the process of fully destroying the original tissue structure of the soybean again after compression.

　　 In fact, the fat of the puffed columnar material is obviously exposed on its surface, and it will quickly enter the solvent once it is immersed. If the relevant factors do not change under normal circumstances, the total residence time of the puffed columnar material in the extractor only needs to be greater than 40 minutes, and the residual oil can be guaranteed to be less than 1%. When leaching without puffing, the total residence time of flake materials in the extractor will generally be no less than 60min. Due to the shortening of the leaching time, it is equivalent to increasing the output per unit time of the extractor. In fact, the puffing process has changed the flake material into a column material with a diameter of 1 inch, and its bulk density has risen from 520kgm3 to about 710kgm3. For new plants, the volume of the extractor can be reduced to save investment.

　　2. Increase the concentration of mixed oil and reduce evaporation and steam consumption

Practice has proved that the immersion powder degree of flake materials can reach 12% or even higher, while the powder degree of puffed columnar materials generally does not exceed 5%, which not only reduces the total amount of mixed oil and soybean meal powder after immersion, but its more prominent advantages are The vertical flow of solvent and mixed oil in the material layer of the extractor is extremely smooth. Therefore, the circulating spray volume can be increased, and the crossover phenomenon of mixed oil caused by poor permeability will not occur. If the residual oil of the meal is less than 1% during the leaching of flake materials, the mixed oil concentration after leaching will not exceed 25%. When the puffing leaching process is used, the mixed oil concentration after leaching can reach about 3% under other conditions unchanged. , The increase of the mixed oil concentration is equivalent to the decrease of the solvent ratio, thus reducing the load of the evaporation system and saving steam consumption.

The puffing process can also effectively destroy the urease and trypsin inhibitors in soybeans that are toxic to animals. In the past, these harmful enzymes were destroyed by steaming and sintering, and the use of puffing technology can also reduce the load of steaming and slinging. The expanded soybeans are more conducive to the leaching of oil by the soybean oil leaching equipment, reducing the leaching time and improving the leaching efficiency.