Oil Pressing Section
Oil pressing, sometimes we called expeller pressing is the way for extracting oil from oilseeds. Pressing characteristics: pure physical press by oil press machine, simple process, less equipment, strong adaptability to oil varieties, flexible production, oil quality good, light color and pure flavor. But after pressing the cake residual oil is high, the efficiency is low, power consumption is large, oil press parts easy to loss is also disadvantage of oil pressing.
Basic Principle Of Oil Extraction
At the time of pressing, the particles of the pressed material are subjected to strong pressure, resulting in two different changes in the liquid portion and the gel portion, respectively, in which the grease is extruded from the oil void and the extruded particles are elastically deformed hard cake. In this process, the cell bodies of oil seeds are destroyed and the oil is squeezed out of the oil. We commonly used oil press machine is screw oil press.
With the pace of development of oil production and processing technology greatly accelerated, rice bran oil, rapeseed oil, corn germ oil, almond oil, pumpkin seed oil, perilla oil, grape seed oil, special oil sand oil and new varieties of special oil, grease, oil and soy protein deep processing products have been developed and put on the market. In addition to oil pressing, solvent extraction process is another way to get oil from oil seeds. For peanut, rapeseed, sunflower seeds and other high oil content seeds, also can be used to pre extract part of oil, then the rest of the oil use solvent extraction process method, divided into two steps to get oil. The combination of oil pressing and solvent extraction process is an important trend in the oil industry.
The Basic Process Of Oil Pressing Technology
1. Conventional process of expeller pressing
Green-pressing Steam cookingPressingFiltrationCrude oil
2. Special oil production process
Oilseeds CookingPressingFiltration Mellow oil
3. Oil cold expeller pressing production process
Oilseeds-->Whole seed cold pressingFiltration Cold pressed oil
Cold Pressing And Hot Pressing
Cold pressing is a kind of expeller pressing way. Cold pressed oil is not heated before the oil pressing, usually below 60 ℃ in the environment, into the oil press machine for pressing, nutrient retention remains the most complete. Cold pressed oil from the low temperature, the acid value is low, generally do not need refining, after sedimentation and filtration, the oil can be obtained. Because of the cold pressing oil rate is only half of the hot press method,, so most of the price of cold pressed oil is about 50% higher than the hot oil. Cold pressed oil molecules are not subject to high temperature damage, generally do not need additives, so you can save for a long time. Market value is relatively high. Commonly there are cold pressed peanut oil, camellia oil and so on.
Hot pressing and cold pressing camellia oil
Hot pressing and cold pressing peanut oil
Hot pressing is pressing oilseeds after roasting. Hot pressing out the oil smell mellow, darker, higher yield. Residues left in the product are small and easy to store. Due to the high temperature heat treatment of oil, a series of changes in the oil, resulting in the destruction of oil cells, protein denaturation, reduce oil viscosity, etc. Due to the cold pressed oil without baking, so the smell is poor, but the color is good. From the two methods showed no residual solvent oil. Although the cold pressing is authentic, healthy life choices, but some are not suitable for cold pressed oil. For example, big mouth contains beany flavor, a toxin gossypol cottonseed oil and oil deterioration of aflatoxins, which must be refined to remove. Sesame oil and peanut oil flavor, need to get hot pressing technology. So, cold pressing health, hot pressing delicious.
Small Oil Press Small oil press is a small volume, convenient carrying, vacuum filtration, automatic temperature controlled oil making machine. Small oil press commonly used screw structure. By the company technical personnel to study caref...
Big Oil Press Compared with small oil press, big oil press has the biggest advantage of high yield. Stand-alone capacity of large oil press ranges from 10-200 T/D. Compared with the small oil press used for household and small oil productio...