Extract oil by pressing is a traditional method of vegetable oil extraction. With the development of oil extraction technology, three types of oil extraction methods are created from manpower press, hydraulic press to screw oil press. The widely used oil machine today is the screw oil press, and the hydraulic oil press is still in use. Screw oil press is an advanced continuous oil extraction equipment, which is widely adopted at home and abroad in recent years. Compared with manpower press, hydraulic oil press (hydraulic machine for oil extraction) and other equipment, screw oil press has the following advantages: large processing capacity, continuous production, low labor intensity and high yield efficiency. The screw oil press is suitable for oil plants of various kinds, such as the rapeseed, soybean, cottonseed, rice bran, especially the oil plants that need to maintain its original natural flavors or some characteristics, such as the tea seed, sesame, cocoa beans, castor bean, etc.
Characteristics of vegetable oil extraction by pressing:
Simple process, less supporting equipment, well-adapted to oil variety, flexible production, good oil quality, light color and pure flavor. However, the amount of residual oil in the cake is higher after pressing with low oil efficiency, large power consumption and the parts wear easily.
First, the basic principle of vegetable oil extraction by pressing.
1.Pressing process
2. The basic principle of vegetable oil extraction by pressing
Second, the factors that affect the effect of vegetable oil extraction.
There are many factors that determine the quality of oil extraction. It mainly includes the material structure and pressing condition.
1. The influence of the properties of the material structure on the oil extraction effect – the properties of pressed materials mainly depend on the composition of the material and the pretreatment effect.
2. The influence of pressing condition on the vegetable oil extraction effect
The pressing condition, the process parameter (pressure, time, temperature, material thickness, oil drainage resistance, etc.), is the decisive factor that increases the oil extraction efficiency.
Third, oil extracting equipment.
Currently, there are mainly two types of pressing equipment: the intermittent hydraulic oil press and continuous screw oil press. Wide varieties of oil plants require the pressing equipment to satisfy various requirements in the structure design as much as possible. At the same time, the oil extraction equipment should have large production capacity, high efficiency, convenient operation and maintenance, multi-usage, less power consumption, etc.