Corn oil processing uses corn germ as raw material. After cleaning, de-stone, crushing, softening, rolling, steaming and frying, the oil is pre-pressed, and the cake is then fully extracted with the corn oil extraction process to reduce the residual oil rate. In the corn germ oil production process, the pretreatment process is of great help to the extraction of oil.
The softening process is one of the commonly used pretreatment processes for the production of edible oil. The purpose of softening is to prepare for the next step of oil press. In order to roll out good embryo flakes, after the embryo is crushed, direct steam and indirect steam should be added to the material in the softening pot according to the moisture content of the embryo, and the embryo should be softened by adjusting the moisture content and temperature. Through softening, the embryo can have good plasticity, reduce the powder degree and sticking to the roller, which is conducive to rolling.
The softening degree of the embryo is directly related to the thickness of the rolled embryo flakes, and it can also affect the residual amount of oil in the corn meal. If the germ has low moisture content and low softening temperature, the germ cannot be softened well, and the powder degree will increase during the embryo rolling, which will cause the solvent to not penetrate and the residual oil in the meal to increase.
Before softening, it is necessary to understand the moisture content in corn germ. The moisture content of corn germ in the same batch of raw materials varies greatly. This is why the germ test data provided by the relevant quality inspection department is very important. In addition, it is necessary to adjust the operating parameters of the softening process in time according to actual observations and practical experience in production. For example, increasing the moisture content will help the volume expansion and coagulation of phospholipid macromolecules. When the oil is extracted, the fat molecules can be retained in the meal due to their large volume. This can also reduce the subsequent process treatment of the mixed oil and the process of fine processing of crude oil and improve the purity and quality of the oil.
If the germ moisture content is low, water should be added appropriately to control the germ moisture temperature at 35-45°C. Too high a temperature will easily affect the germ protein content. The role of heating is to make the embryo absorb water vapor as quickly as possible, improve the plasticity of the embryo, and destroy the cell structure of the embryo, which is conducive to the extraction of oil. In the softening operation, the moisture content of the embryo is proportional to the softening temperature. The strategy and method of controlling the softening temperature by the moisture content of the embryo.
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