How many kinds of peanut oil production processes are there?

Peanut oil pressing technology: cleaning → shelling → crushing → rolling → steaming → pressing.

1. Cleaning and drying of peanuts: removing impurities from peanuts. Peanuts entering the oil plant inevitably carry some impurities. If impurities such as dirt, stems and leaves in peanuts are not removed, it will not only affect the quality of oil and cake, but also adsorb some oil and reduce the oil yield. If there are impurities such as sand, stone, metal and hemp rope in peanut, it will cause the parts of peanut oil press to wear, induce production accidents and affect the process effect. Therefore, in order to ensure the smooth production of peanut oil press, it is necessary to remove impurities as much as possible, and it is also necessary to dry some peanuts with high water content in order to facilitate shelling. There are many cleaning methods, and different methods can be adopted according to the situation of impurities. If the impurities are light, such as grass, stems, leaves, etc. Air separation can be used to blow away impurities with airflow. If the impurity particles are very small, impurities can be removed by selection. For some impurities similar in size and relative density to peanuts, if they belong to clay blocks, they can be rubbed and crushed in a mud machine, and then screened and removed. If it is iron impurity, it can be separated by electromagnet or permanent magnet. After cleaning, the impurity content should be below.

2. Shelling: The purpose of shelling before peanut pressing process is to reduce the adsorption of oil on the shell and speed up the oil production; It can accelerate the processing capacity of peanut oil press and reduce the wear and tear of oil press equipment; Conducive to billet rolling and accelerating the quality of crude oil; It can speed up the quality of cakes and is beneficial to comprehensive utilization.

3. Crushing: Crushing peanuts with a crusher, so that the crushing granularity of peanuts meets the conditions of embryo rolling. ?

4. Blank rolling: using a single pair of blank rolling machines to roll the blank into a thin and uniform blank. It is required that the blank powder is small, oil-tight and the thickness is below 0.5㎜.

5. Heat treatment (steaming and frying): destroy the cell structure of the oil, denature the protein, make the phospholipid absorb water and swell, meet the pressing requirements, speed up the oil production and reduce the phospholipid content. Heat treatment is one of the important processes in oil extraction. Heat treatment includes wet blank and heating blank, which is called steamed blank or fried blank in production, and steamed blank is called cooked blank. The green body pressed after heat treatment is called hot pressing, and the green body pressed without heat treatment is called cold pressing. Peanut is mainly hot pressed. The effect of heat treatment directly affects the smooth progress of the whole oil-making process, the oil yield and the quality of oil and cake. 6. Squeezing: Peanut oil press is a small oil press with simple structure, high pressure, continuous processing of materials and low labor intensity, which can squeeze a variety of oils. Because the round rod of peanut oil press is zigzag curve and conical surface, the space volume between the press screw and the inner wall of the press cage is constantly changing due to the pushing and pressing of the press screw when pressing materials. Because the round bar is arranged behind the extrusion cage, the inner wall of the extrusion cage is serrated, and the blank is extruded and relaxed alternately here, so that the structure of the blank is constantly adjusted and rotated evenly, and the blank that is not extruded or has less oil is more likely to be fully extruded. So its squeezing effect is better.