What are the procedures for pressing sunflower seed oil?

Sunflower seed oil is a kind of high-quality edible oil, which is known as "nutritional oil". It contains more unsaturated fatty acids and vitamin E, which is easily absorbed by the human body. Linoleic acid content is as high as 70%, which can reduce the cholesterol content of human body. Sunflower seed oil can be used to produce margarine, mayonnaise and salad oil. Sunflower seeds must be pretreated before pressing, and the quality of pretreatment will directly affect the normal operation and oil yield of small oil presses. Sunflower seed oil must be washed first, then shelled, pressed, rolled, steamed, fried, pressed and produced. From the safety point of view, self-pressed sunflower seed oil is not as good as refined oil, and from the nutritional point of view, self-pressed sunflower seed oil has advantages over refined oil. What are the procedures for pressing sunflower seed oil?

1, cleaning. The oil entering the processing plant contains some impurities (silt, stones, iron filings, etc.). ). If it is not carefully cleaned, it will accelerate the wear of the internal parts of the oil press, reduce the oil yield, and even cause failures and accidents. Its supporting equipment includes: screen cleaning, stone removal machine, magnetic separator, etc.

2. Shells. For the oil with shell, it is necessary to peel it first and then press it, which can improve the productivity and oil yield. Its supporting equipment includes: sheller, separating screen, separator, etc.

3. it's broken. Some oils can be pressed as a whole, but after pressing and rolling, the oil yield can be obviously improved. Its supporting equipment includes: crusher, embryo rolling machine, etc.

4. Steamed and fried. Steaming and frying is an important link to improve oil yield. The common method is to wet the oil first, and then put it into a frying pan to dry it, so that the oil can meet the pressing moisture and temperature required by the process. The supporting equipment is: steam wok and seed wok.

Note: The pressing process of sunflower seed oil is also very simple. Pay attention to the above steps when pressing, and you can operate and use the oil press well to squeeze out high-quality sunflower seed oil. Sunflower seeds are steamed and fried in a pot, and then put into an oil press. After being squeezed out, the oil yield of cooked oil is higher and the hot oil is more fragrant.

Is it edible to squeeze sunflower seed oil yourself?

Self-squeezed oil is the oil provided by oneself and squeezed by the oil squeezing workshop. In food technology, this oil is called "crude oil". The main component of edible oil is triglyceride. Crude oil contains considerable impurities such as phospholipids and free fatty acids.

We know that oil will smoke when heated to a certain temperature. The discharged smoke contains a substance called acrolein, which has a strong stimulating effect on eyes and respiratory tract. In World War I, acrolein was even used as a chemical weapon. In addition, smoking can also produce other harmful substances.

The temperature at which oil begins to smoke is called "smoke point". The smoke point is related to the type of oil. For example, the smoke point of sunflower seed oil is less than 1 10 degree, while the smoke point of sesame seed oil is close to 180 degree. The smoke point of the same oil is closely related to the impurities in it. The smoke point of soybean and peanut crude oil is about 160 degrees, which can reach more than 230 degrees after refining. From a safety point of view, "home oil extraction" is not as good as refined oil.

However, some healthy components in vegetable oil, such as vitamin E and phytosterol, will also be removed with refining. In some cases, the loss may reach 10%. Therefore, from the nutritional point of view, "home-pressed oil" has certain advantages over refined oil.