How Are Vegetable Oils Produced?

Vegetable oils are the edible oils extracted from seeds, nuts, kernels and other plant tissue. Edible vegetable oils are extracted from plants using solvents such a hexane and/or through mechanical processes such as cold pressing and expelling. Mechanical processing does not involve solvents

and the major difference is the temperature of the extraction processes. Cold pressing involves a hydraulic press between two plates and the temperature tends to stay below 120°F. Meanwhile, expelling involves a screwing mechanism which results in more frictional heat allowing the temperature to reach as high as 185°F.