The establishment of oilseeds pretreatment depends on oilseed varieties, oil processing method, product quality standard, oilseeds utilization and invest on oil machine project etc. Oil pressing is type of simple oil making process, which includes pressing, pre-pressing, high temperature oil pressing, and cold oil pressing etc.
Simple oil pressing process flow adopts one time pressing or twice pressing of oilseeds. It enables special oil taste and flavor during processing, such as sesame oil, fragrant, peanut oil, coconut butter etc. This oil pressing method is also applicable for small-scale oil plant. Usually high pressing oil yield is required during oil pressing project.
Oil pressing processing flow is always combined with oil extraction, which is mostly used in large-scale oil plant or bulk oilseeds processing. There is 70% oil content pressed out from oilseeds in primary press, and residual oil is extracted from oilseed cake by organic solvent.
High temperature oil pressing method is applicable in oilseed prepressing or oilseed pretreatment. Cold oil pressing machine is adopted on condition that pressed cake is used as materials for oil fat production and medical production. The oilseed cake keeps low temperature of less than 70 degrees during cold oil press. It assures invariance of oilseed protein denaturation.
