Screw Oil Press Machine process of pressing copra
(1) Extracting oil by mechanical method. The dried coconut with a moisture content of 10%-12% is transported to an automatic scale, and the iron is removed through a magnetic chamber and ground into particles with a diameter of about 0.3mm. The particles are pressed into flakes to enlarge the surface area. The preform was steam-fried and tempered in a horizontal steam-frying pan at 115°C for 20 minutes. Under this condition, due to the rupture of fat cells, phospholipids precipitate, and the water content drops to 3%. The steamed and fried preforms of the same size are sent to the oil press to continuously squeeze the oil. Along the inner section of the press chamber to the taper end outlet, most of the grease is discharged according to a uniformly decreasing characteristic curve. Generally speaking, the residual oil of coconut cake after treatment is 7%.
The characteristics of coconut oil meal produced by a well-maintained screw press are as follows: 1. The oil is light in color, R8Y50, measured by the Lovibond method, 2. The cake is light brown, with a high residual oil of 8%, 3. Coconut cake The thickness is the same, about 0.6mm, and the fine powder does not exceed 6%.
The operation of the screw oil press requires steaming and tempering. The temperature of the coconut slab is controlled between 91-93℃ for a certain period of time, and the moisture content is reduced to between 3%-4%, at 91℃ Below, when the moisture content is above 4%, the coconut slab produces less oil, and when the moisture content is above 83°C and the moisture content is less than 3%, the dark oil coke cake is extracted from the coconut slab, and the resulting oil is produced. The rate is low. The sieved and precipitated fine particles should not exceed 10% of the fresh raw materials to avoid the formation of fine particles during the steaming and conditioning stage.
(2) Post-squeezing treatment The oil from the screw press is sent to the screen and the clear oil tank to separate particles, which will be mixed with the raw materials and enter the system for processing. Each ton of super clear oil should be mixed with 10Kg of white clay. After passing through the safety filter, the oil is cleaned and stored or further processed.
The compressed coconut cake is pelletized, bagged, and sent to the animal feed factory. Or the coconut cake is sent to the solvent extraction section for leaching and further degreasing. This unit operation is used as a supplement to the mechanical pressing method to reduce the residual oil in the coconut meal.
After the initial extraction of coconut cake, the residual oil content is controlled at 14%-18%, and the output of the screw press is almost doubled. N-Hexane (boiling point 68.7°C) is widely used as a leaching solvent. In the countercurrent leaching unit, the meal is first contacted with the concentrated mixed oil (n-hexane + oil), and is washed with pure hexane when it leaves the extractor. The residual oil of the meal soaked with solvent is about 3.5%.
Coconut oil is produced from coconuts. There are different processing methods according to the nature of the raw materials. In addition to the previous comprehensive coconut processing, coconut powder, coconut juice beverage and wet processing, large-scale industrial production is mainly the mechanical pressing of dried coconuts, organic Solvent leaching, or coconut intervention pressing and leaching method
