Adopt the technique of expeller pressing that is the technique of extracting oil with a mechanical press rather than making use of a chemical extraction process.
Rendered with screw type machine which presses the nuts and seeds via the barrel and makes friction as well as pressure to compress the ingredients. The oil falls via the small lead-ins while pulp is excluded separately.
The processing of these results in clean oil, which is higher in natural colors as well as flavors. The resulting oils are the more luxurious alternatives found in health food stores, which have most likely been pull out employing this method.
The systems do not need the use of a vertical centrifuge so as to separate the oil. These continue to press oil out of the seeds.