Sunflower seeds have a high oil content of 38%~45%. The protein content of the meal after oil extraction is as high as 38%~42%, which is suitable for pre-pressing-extraction method. First, use sunflower oil pressing method to extract oil, extract 80%~89% of the oil from sunflower seeds, and crush the cake to a suitable particle size before using the sunflower oil extraction machine to extract the remaining oil. Pre-pressing extraction can increase the oil yield of the product and also increase the production capacity of the oil extraction equipment. The difference between pressed sunflower oil and extracted sunflower oil can be introduced from the following two points.
1. Different processes;
Pressed oil is a "physical pressing method" that separates oil directly from oil by physical pressure.
The processing technology of extracted oil is a "chemical extraction method" that soaks the sunflower seed with chemical solvents, extracts the oil from the sunflower seed, and then separates the oil and solvent through sunflower oil refining process.
2. Different nutritional ingredients;
The oil pressing method squeezes out the oil through physical pressure, without chemical additives, retaining the original flavor and nutritional ingredients of sunflower oil, and can be eaten directly after filtering.
The oil extraction method extracts oil through chemical solvents, and needs to be refined by sunflower oil refining machine to remove impurities and harmful components before it can be eaten. The extraced oil is colorless and tasteless, and some nutrients will be removed along with the oil during the sunflower oil refining process.
Most people think that "pressed oil is green food and healthy; while extracted oil is refined by chemical methods, with chemical solvent residues, which is unhealthy." But in fact, pressing and extraction are just two different cooking oil production processes. No matter which process is used, the oil obtained can only be crude oil, which contains various impurities such as water, free fatty acids, pigments, proteins, etc.; in addition to hygiene factors, crude oil is not durable for storage, and the impurities contained in crude oil will cause hydrolytic rancidity. Therefore, the crude oil needs to be refined by sunflower oil refining machine to remove some impurities, so that it becomes a lighter-colored, clear refined oil that meets the standards of various levels of oil products before it can be put on the market for sale.
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