Expeller-Pressed Process :- Expeller pressing employs a press to physically press the oil out of the seed as opposed to employing chemicals to do it. No solvents are utilised in the expeller-pressed procedure, thus there is no possibility of encountering any lingering hexane residue. An expeller press is a device that uses friction and constant pressure to force oil through a hollow. About 87 to 95% of the oil in the seed is extracted during expeller pressing; hence, some oil is still present after pressing. 

Cold-Pressed Process :- Low oil content seeds and nuts can have their oil extracted using cold press expellers, commonly known as cold oil presses. They operate without the use of heat or chemicals by slowly pressing the oil-bearing material after crushing it. Because it keeps the oil’s inherent nutrients and flavors, this method of oil extraction is frequently recommended. Cold-pressed seed oils are expeller-pressed oils that have not been cooked during the refining process and are completely unprocessed. These oils can only be made at temperatures below 122 degrees Fahrenheit. 

Solvent Extracted Process :- The seeds are mashed into a paste before the oil is extracted during the solvent extraction process. The internal fat is then released from the crushed seeds by purging or washing them with a solvent like hexane.  The oil is subsequently processed in an enclosed chamber to remove the solvent. Refined, Bleached and Deodorised, sometimes known as “RBD,” is the last step in the oil’s refinement process. Oil may also be winterized and/or degummed in specific circumstances. 97 to 99% of the oil from the seed is removed by solvent expulsion. The oil may be extracted from the seeds most effectively using this procedure.