Are you eager to boost the oil extraction rate of your soybean oil press but don't know where to start? This guide will take you through the core working principles and practical operation points of soybean oil presses, helping you enhance your oil production efficiency.
The soybean oil press mainly uses mechanical force to extract oil from soybeans. There are two main types of pressing methods: screw pressing, which includes both cold and hot pressing processes. Each method has its own characteristics and key control points.
Let's first understand the difference between cold and hot pressing. Cold pressing is carried out at a relatively low temperature (usually below 60°C). This method can better preserve the nutrients and natural flavor of the oil, and also retain more protein in the soybean cake. However, the oil extraction rate is relatively low, usually around 10 - 15% lower than hot pressing. On the other hand, hot pressing involves heating the soybeans before pressing. The high - temperature treatment can break down the cell walls of the soybeans more effectively, increasing the oil extraction rate. But it may also cause some loss of nutrients and change the flavor of the oil to some extent.
Before pressing, it is crucial to clean the soybeans to remove impurities such as dust, stones, and broken beans. Shelling the soybeans can also improve the oil extraction rate. Impurities can not only damage the oil press but also affect the quality of the oil. A clean and well - shelled soybean can ensure a smooth pressing process.
The feeding speed and quantity are important factors affecting the oil extraction rate. If the feeding is too fast, the oil press may not be able to fully press the soybeans, resulting in a low oil extraction rate and high oil content in the soybean cake. Conversely, if the feeding is too slow, the production efficiency will be reduced. Generally, for a medium - sized soybean oil press, the feeding speed should be controlled at about 10 - 15 kg per hour.
Proper pressure setting is the key to improving the oil extraction rate. Different types of oil presses have different pressure requirements. For screw oil presses, the pressure usually needs to be gradually increased during the pressing process. According to industry experience, a pressure of 30 - 50 MPa can achieve a relatively high oil extraction rate. You can adjust the pressure through the pressure adjustment device on the oil press.
After pressing, the crude oil needs to be filtered to remove impurities such as soybean residues. There are various filtration methods, such as using filter cloth or filter paper. A good filtration process can improve the clarity and quality of the oil. For example, using a filter cloth with a fineness of 200 - 300 mesh can effectively remove most of the impurities.
The quality of the soybean cake can also reflect the oil extraction effect. A high - quality soybean cake should be dry, with a low oil content (usually less than 8%). If the soybean cake is too moist or has a high oil content, it means that the oil extraction process needs to be optimized.
One small - scale oil mill operator, Mr. Smith, was facing the problem of low oil extraction rate and high oil content in the soybean cake. After following our operation guide, he optimized the pre - treatment process, adjusted the feeding speed and pressure, and improved the filtration method. As a result, his oil extraction rate increased by 18%, and the oil content in the soybean cake decreased from 12% to 6%. This not only increased his oil production but also improved the quality of the soybean cake, which could be sold at a better price in the market.
By comparing different operation methods and technical parameters, we can see that scientific operation can stably increase the oil production efficiency by more than 15%.
To help you better operate the soybean oil press, here is a simple operation checklist:
If you encounter problems such as low oil extraction rate or high oil content in the soybean cake, you can refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Low oil extraction rate | Improper pre - treatment, incorrect feeding speed, low pressure | Optimize pre - treatment, adjust feeding speed, increase pressure |
| High oil content in soybean cake | Insufficient pressing, improper pressure adjustment | Increase pressing time, readjust pressure |
If you want to know more about the technical details of soybean oil presses and how to further optimize your oil production process, click here to learn more.
