What is the difference between rice bran oil pre-press and leaching?

What is rice bran oil
The rice bran obtained from the rice processing process is obtained by pressing or leaching. Rice bran contains about 18% oil. In addition to serving, it can be used in soap, hardened oil, glycerin, stearic acid, oleic acid, paint resin, etc.

What is the difference between rice bran oil pre-press and leaching?
Pre-squeezing is a physical treatment method. Straight stalks are squeezed with oil. Of course, it is advisable to heat and fry for oil extraction. The leaching is to extract the oil with n-hexane, let the oil dissolve in n-hexane, filter, and steam. The oil is separated from n-hexane.