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Several Influencing Factors on the Operation Effect of Walnut Oil Equipment

September 29, 2021

Walnut Oil Equipment

The oil processed by walnut oil equipment and rapeseed oil equipment is the oil we often use daily. It can effectively reduce the cholesterol content in the blood, and the use of rapeseed fried food is clean and clean, and the use of rapeseed oil Will not get fat. In the process of squeezing rapeseed oil, there are many factors for the quality of nutritious rapeseed oil, and the most basic ones are temperature, moisture, reasonable squeezing conditions and the quality of raw materials.

The temperature of walnut oil: When tea seeds are hot pressed to make oil, the temperature of the squeezed raw material directly affects the oil yield. The general pressing temperature is 105~110℃, and the highest temperature can reach 130℃. Because the press itself cannot control the temperature, the billet mainly depends on steaming to obtain high temperature. High temperature can reduce the viscosity of the grease, increase the fluidity of the grease, and make the oil easy to be pressed out. Therefore, the squeezing temperature of the blanks should be increased as much as possible, but it should not exceed 130°C, otherwise the blanks will be easily coked, which will reduce the oil yield. Experience has shown that if the billet temperature is below 95°C, the oil output rate is greatly reduced (for example, the oil output rate at a standard temperature of 105°C is 25%, and it may be reduced to about 20% when the temperature is below 95°C).

Moisture of walnut oil: The moisture content of the preform also affects the oil yield. The principle of "steaming embryos with high moisture content and pressing with low moisture" must be mastered. This is the operating experience of my country's oil industry to improve the oil yield. When steaming embryos with high moisture content, the moisture content of the raw embryos should reach more than 15%. When pressing with low moisture content, the moisture content of the cooked embryos must be 3%-8%. The embryos are too dry and the oil yield is low. For example, if the tea seeds are exposed to the sun for a long time, the tea kernels are too dry, and they are not sprayed with water vapor during steaming, the oil yield is only 19% to 21%. Later, when steam is sprayed in for steaming, the oil yield rapidly increases to 25% to 26%. .

The squeezing conditions of walnut oil: the pressure, the pressure state (dynamic and static) of the embryo, the pressure speed, and the squeezing time all have an impact on the oil output. In actual production, the cake surface pressure is required to slightly exceed the critical pressure, and the required cake surface pressure is also different under pressure, and the range is 9 to 100 MPa. The hydraulic oil press is a static press, with a long oil output time, requiring a slow pressurization speed, light press first, then heavy press, frequent pressurization, and workshop heat preservation. The screw oil press is a dynamic and instantaneous pressing, with fast pressure rise, frictional heat generation, easy opening of the oil circuit, short pressing time, high oil yield, but has a greater thermal impact on the quality of the cake.

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