In principle, the expanded soy flour can be produced by a wet method as long as it has a steam condition. This is due to the high production efficiency of the wet process. The latest research proves that under the same power condition, the use of the wet method of the expanded soybean powder is more than double that of the dry method, for example, the production of 800 KW dry-expanded soybean powder is 800-1000 kg. The wet production can reach 2500 kg, and the EXT155S of the foreign machinery in the Wenshi Group has a production capacity of more than 2,800 kg. The efficiency is the highest among similar models in China, and it is one of the mainstream models on the market. The wet expansion control urease activity is more stable and can be accurately controlled between 0.02 and 0.2. The urease activity of dry-expanded soybean powder fluctuates greatly, and the degree of ripening is prone to be uneven. The moisture content of the wet-expanded soybean powder can be accurately controlled at about 12%, while the dry product moisture is only about 8%, and the dry consumption causes a substantial increase in production costs. Puffed soy flour is used for its own use. When the amount is not high, it is recommended to use the dry method, which is not sensitive to the moisture content of the product. The dry machine is more suitable. For example, if soy flour is used for sale, it is recommended to use a wet model. First, the efficiency is much higher than the dry method. The production cost is obviously lower than the dry method. Secondly, the moisture content of the finished product is easier to master; some areas require dry expanded soybean powder products. , can stop production of steam, the same can meet the requirements.
Although the wet-expanded soy flour is highly efficient, there are quite a few customers in Fujian's Fujian area who prefer dry-expanded soy flour, which may be rich in flavor and better in attracting. Therefore, many manufacturers use dry method to puff the soybean powder.
Due to the special physical properties of corn, the expanded corn for feed can be produced by dry wet method. Different from soybean oil and other raw materials, the quenching temperature is too high, the steam volume is too large, causing transportation problems, resulting in returning and blocking the machine. Therefore, the quenching and tempering requirements of corn for steam are low, so the efficiency difference between dry and wet production is not as good as soybean. Significantly, the wet method can be increased by about 15% compared to the dry method. If the quality of the steam is unstable, the moisture in the material entering the machine will fluctuate, which will easily cause the machine and product quality to fluctuate. Therefore, wet puffed corn requires more operators, so keep an eye on the changes in steam and final products and adjust accordingly. The main indicator of puffed corn is the degree of gelatinization and bulk density (specially stated separately), and it is necessary to determine whether to use dry or wet puffing depending on the use of the product. If the expanded corn flour is used for sale, it is recommended to dry the machine. Due to the dry puffed corn, the expansion degree can be adjusted to a wide range, which can achieve a high degree of expansion (product weight ≤ 200g / L), to meet the needs of different users. Requirements, and low investment, quick results. If it is used by itself (processing compound feed), the wet method can be considered. The yield is slightly higher than the dry method, and the starch gelatinization degree can reach 85% or more. Although the degree of expansion is not as high as the dry method, the effect is also good after the mixture is prepared. It should be pointed out that the degree of corn expansion required by special fur animals is higher than that required for suckling pigs, and most of the bulk density is around 0.3. Therefore, the requirements for puffed corn in the northern region are higher than those in the south. At present, theoretically, the bulk density of 0.4~0.5 can be used for suckling pigs, but users tend to use the requirements of fox mites to select puffed corn. Therefore, if the expanded corn flour is used for special animal feed (貂, fox, 貉, etc.), the dry method should be adopted because of the high requirements for puffing and ripening; if it is used for the preparation of suckling pig materials, dry and wet methods can be used. As mentioned earlier, some wet machines can not be used for dry processes, such as the production of puffed corn. The wetness of the wet machine is generally about 85%, the bulk density is 0.4~0.5, and the temperature is 140~150°C. Degree and degree of expansion increase, such as a bulk density of 0.2, a temperature of 160 ~ 170 ° C, may need to shut down steam quenching and tempering dry production can be achieved. Because the difference in the properties of the incoming material causes a sudden increase in torque and thrust (compared to the wet method), whether the spindle and bearing housing structure can withstand, whether the bullet portion can withstand corrosion at high temperatures requires practice and time to verify. Many wet-type models on the market today do not have the ability to dry-produce high-expansion corn flour.
In addition to the above, the selection of two kinds of equipment for puffed corn and soybean should be considered. If the expected yield of the two products is not very high, and the average is equivalent, the dry machine should be used. Because the production of corn and soybeans by wet machine is quite different, if the time for soybean puffing is small, it is mainly used for corn puffing. In this way, the steam system and the configuration of the conditioner are not obvious, that is, the same production target. The investment is much higher than the dry process unit.