The pressing methods are generally divided into extraction technology and pressing technology
Extraction process
The oil produced by the extraction process is also called leached oil, which is to extract the oil with organic solvent (such as gasoline, ethanol, etc.). The extraction method is a kind of oil making process in which the oil is extracted by soaking the oil raw material with solvent oil (No. 6 light gasoline) and extracting it at high temperature. The "oil" extracted from the initial extraction is a mixture of organic solvents and oils, which can not be eaten. It must go through a series of refining processes (dewaxing, degumming, dehydration, deodorization, deacidification, decolorization and other chemical treatments) before it can be eaten. The oil is generally light in color and the original natural odor in the seed material is light or no obvious odor. Extraction technology can almost extract all the oil from the oil, the economic benefit is very high, is the most popular processing method in modern oil industry.
Pressing process
Pressing process, also known as "physical pressing method", is to use external force to squeeze out the oil in the oil, generally with the roasting process.
Pressing oil is divided into conventional pressing and refined pressing.
