Furthermore, most of the oil left in the cake can be recovered by a stage of solvent extraction. In the case of oil-rich seeds such as sesame or peanuts this may still be acceptable. Even the most powerful presses cannot reduce the level of residual oil in the press-cake below 3 to 5%. The main disadvantage of the expeller pressing method is its relatively low yield of oil recovery. The process of extraction is the critical quality difference between oils often found in the natural foods marketplace as opposed to mass market or supermarket brands. There are no solvent (chemical) residues in oil that has been expeller pressed resulting in a cleaner more pure oil, higher in natural colors and flavors. While the smallest solvent extraction plant would have a processing capacity of 100-200 tons per day, expellers are available for much smaller capacities, from a few tons per day and up. The process is relatively simple and not capital-intensive. Pressure involved in expeller pressing creates heat in the range of 140-210º F (60-99º C).Īdvantage and Disadvantages of the Expeller Pressing MethodĮxpellers can be used with almost any kind of oilseeds and nuts. Afterward, the pressed seeds are formed into a hardened cake, which is removed from the machine. The oil seeds through small openings that do not allow seed fiber solids to pass through. Pre-presses are designed for pre-pressing in preparation for extraction, or as the. This machine uses friction and continuous pressure from the screw drives to move and compress the seed material. Oil cake leaves the screw press through an adjustable conical annular.
An expeller press is a screw type machine, which presses oil seeds through a caged barrel-like cavity. However for some seeds, such two stage processes (pre-press/solvent extraction) are now widely applied.Įxpeller pressing is the method of extracting oil with a mechanical press rather than utilizing a chemical extraction process. Oil and press cake can be sold in the local market respectively for household use or as protein concentrate in animal feed. Almost any conceivable oilseed with more than 25 oil to seed can be processed, normally without any pretreatment. It is a low cost expeller for the small scale oil seed processor. Usually there two main methd of extracting oil, they are mechanical pressing with expller press and chemical methos with with solvent. The PITEBA oil expeller fulfils a need in this respect.
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