What is the working principle of oil press?

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What is the working principle of oil press?

1. With the help of mechanical force, the oil will be squeezed out of the oil material from the oil extraction method is called the pressing method of oil extraction.

2. According to the size of the pressure on the press material and the depth of the press to extract oil, the press method can be divided into a press and pre-pressing. The first pressing, also called full pressing, requires the pressing process to extract as much oil as possible from the press material, and the residual oil in the cake after pressing can reach about 5%. Pre-pressing only requires that about 70% of the oil in the press material be extracted during the pressing process, and the pre-pressed cake is then subjected to solvent leaching for oil extraction. According to different pressing temperatures, oil extraction from pressing can also be divided into hot pressing and cold pressing. Hot pressing has a high oil yield, but the protein of the cake is deeply denatured and is generally used as feed. The oil yield of cold pressing (temperature below 80°) is lower, but the degree of protein denaturation in the cake is small, light color, and can be used as raw material for edible protein powder.

3. Pressing method of oil extraction and other oil extraction methods compared with a simple process. Supporting equipment less, adaptability to oil varieties, production flexibility, good oil quality, light color, flavor and other advantages, the disadvantage is that after pressing the cake residual oil is high, the power consumption of the pressing process is large, easy to wear and tear of parts and components, such as press bar.

4. Before pressing and taking oil, the material billet should usually be respectfully fried or tempered. Crushing oil should be dregs removal. Therefore, the typical pressing process includes stir-frying (tempering), pressing, and dregs removal of gross oil.