oil processing plant
These oil mill can process a number of oilseeds like peanut, soya, cotton seeds sunflower seeds, corn germ, rape seeds, canola, castor, sesame, neem seed, sheanut, palm kernel and the like. The most important equipment in the entire milling / pressing process is oil expellers which are used for high oil content seeds and also used for smaller capacity oil production plant.
In former times, oil extraction was done exclusively with presses. In most oil milling plant, oil extraction is done with expellers as pre extraction before solvent extraction or as direct press extraction.
Oil Milling Plant
Mechanical oil pressing is to extract the oil by certain oil pressing machine from the oil material by physics pressure, all the courses are without any chemical additive. The typical oil pressing method usually include the following two kinds, cold pressing and hot pressing.
Cold Pressing:The temperature should be controlled between 60～ 70 ℃, in order to prevent the protein denaturation or other nutrition in the oil will be easier to refine. By using this oil pressing method, a certain oil pressing machine - cold press will be used.
Hot Pressing: According to the heat and to extract more oil, the temperature should above 110 ℃, the oil pressing machine - hot press can get higher output, usually 10%~15%higher.
Flowchart of Pressing
Oil pressing often includes thress sections, they are cooking , pressing and filtering. In each process, different equipment will be used, such as steam cooker, oil press, plate filter press.
Single pressing can also be called full pressing and is usually applied at small capacity oil milling plants. For this process there is a single pressing machine. These mills work on the principle of mechanical extraction to separate oil from seeds. For seeds with high oil content, double pressing should be incorporated for maximum yield.
With KMEC’s single presses the oil residual in cake is around 5-7%. The use of a single pressing machine doesn’t require chemical treatment for oil extraction. The major advantage in using a single pressing machine is that it greatly increases the oil yield. The resulting oil’s quality is high, as it is pure and healthy from not being chemically treated. Single pressing machines are used to extract oil from nearly all kinds of oilseeds and nuts to include sunflower seeds, cotton seeds, mustard seeds, copra, peanuts, linseeds, flax seeds and soybeans.
For larger capacities, the oil mill is used for pre-pressing where the initial oil is extracted mechanically. Then pre-pressed cake is sent to the solvent extraction plant. Pre-pressing is a traditional method to process high oil-content oilseeds. The advantages of KMEC pre-pressing technology are as follows:
Hot pressing refers to the art of applying heat in conjunction with mechanical pressure. Here in the oil milling plant, hot pressing means cooking the oil seeds with a hot pressing machine before pressing in order to extract more oil.
Cold pressing or cold milling generally refers to the process of mechanically separating oil while pressing or crushing oil seeds using only the application of pressure, without the addition of heat or chemicals. By using a cold pressing machine the natural structure of the oil is maintained along with all of its natural characteristics.
Cold pressing does not actually mean pressing the seeds without any heat, as oil extraction cannot be done without the use of heat. Heat extracts oil from the seeds faster. In fact, it is hard to find oils that are pressed without heat.
Advantages of Mechanical Pressing Technology
- The speed reducer saves the energy of the equipments
- The speed reducer make the equipments energy saved;
- The special design of the expellers are with lower residual oil left in cake and make higher oil output;
- The quality of oil cake from pressing is higher, more suits for downstream processing.
- Versatile to process many kinds of oil seeds, such as peanut kernels, rapeseeds, cotton seeds, sunflower seeds, corn germ, palm kernel, sesame, etc.
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