Olive Oil Then and Now - How The Process Has Changed
Using a traditional press to extract olive oil from olives has been used for hundreds of years. This process consists of extracting the oil and water from the olive paste. A complete process is needed in able to make olive oil, which once finished with the pressing process; it must also be put through a decanter in order to separate the vegetation water from the olive oil itself. Here is the full process that is needed:
First of all the olives should be harvested and the bad olives removed from the bunch. The olives are then put under a special stone called millstone or in some areas a ground stone. The olives should stay under the stone for just over a half an hour to turn them into a paste, also to guarantee that the paste collects the right aromas and smell that come from the fruit enzymes and forms into the olive oil drops.
Once this process is over and the olives are converted into a paste, the past is spread onto fiber disks. Once fully and evenly spread onto the disks the paste is placed into the press machine. The press will then apply the necessary pressure needed to compact the past and percolate the oil forms and the water in the paste. Water is placed in the sides of the press to simplify the process of percolation.
When the pressing is finished the oil and water must be separated to achieve a pure olive oil. With the traditional process both the oil and the water a put into a decanter but there is another process that is a lot quicker than the decanter. The faster process is one called vertical centrifuge and is used to complete the whole process of oil and water separation a lot faster.
Once the extraction process has been fully completed, the cleaning process begins. This process has to be done thoroughly because if not the remaining past will begin to ferment on the millstones and disks causing other oils to get contaminated and change the taste of the oil completely. Every time new oil is to be made, a complete check that the press and millstones are completely clean must be done.
There are both advantages and disadvantages when using this method of extraction to make olive oil. The advantages are that there is a better grinding of the olives and due to less water usage; the oil is pomaced a lot easier. The difficult cleaning process, a wider time between the harvest and the pressing of the olives and the amount of manual labor are some of the disadvantages.