kylmäpuristukseen

Kylmäpuristus, often translated as cold pressing, is a method of extracting oils from seeds, nuts, and fruits without the use of heat. This technique relies on mechanical pressure applied by a press to rupture the cell walls of the source material and release the oil. The process is typically carried out at temperatures below 50 degrees Celsius, which is crucial for preserving the natural enzymes, vitamins, antioxidants, and flavor compounds present in the oil.

Unlike methods that involve heat, such as hot pressing or solvent extraction, cold pressing avoids the degradation of these beneficial components. Heat can alter the molecular structure of the oil, leading to a loss of nutritional value and a change in taste and aroma. Therefore, cold-pressed oils are generally considered to be of higher quality and possess a more intense, characteristic flavor.

The fruits and seeds are usually cleaned and sometimes de-shelled before being fed into the press. The press, which can be manual or hydraulic, exerts significant pressure. The resulting mixture of oil and solid pulp is then typically filtered to separate the pure oil. Common examples of cold-pressed oils include olive oil, flaxseed oil, sesame oil, and various nut oils. This method is favored for its ability to produce a pure, unadulterated oil that retains its natural properties.