Why cold pressing?
Myriad methods exist to extract oil from plants and trees. Just to give a broad example, distillation and solvent extraction is a way in which the plant is instilled in other constituents to extract the fragrant particles.
However, when the concern is extraction of oil from seed, cold pressing method is ideal. Most of the essential oils and carrier oils utilize cold pressing. One particular reason behind this preference is the purity of oil (100%) that is extracted as a result.
Why is it cold pressed?
All other processes require the presence of an external substance, which is not a case with cold pressing. Here, the seeds are crushed and pressed such that the oil is forced out of them.
If you are wondering if the friction spikes up the temperature of the products, it definitely does. However according to experts, it is not too high. The only thing that manufacturers should keep in mind is to maintain the temperature in a specific range so they can claim that the oil is cold pressed. Every oil has a specific range. For example, in the extraction of jojoba oil, the temperature cannot exceed beyond 45 ° C and for extra virgin olive oil, it cannot go beyond 25 ° C.
The Steps of Cold Processing
- The first step is filtration. In this step, the seeds are passed through a series of spaces with air propulsion systems to remove any impurities.
- In the next step, the nuts or seeds are ground into a paste with the help of heavy granite millstones or conventional stainless steel presses.
- The partially solid paste is then stirred slowly with the help of a rotating screw, which separates oil from its solid part. Then, pressure is applied to extract the oil. This is the most crucial part of the process because if the temperature rises higher than suggested, the process may be disturbed and destroy the properties of the oil.
- The freshly pressed oil then goes through a series of filters that separate small pieces of peel or pulp of the fruit from the oil. The final part of this filtering process involves passing the oil through a cloth or paper to ensure that all impurities are removed from the oil.
- After the filtration is done, the final process is decantation that allows any remaining sediment to be separated from the oil with sheer gravity.
- You get 100% pure and natural oil.