... ). Oil Pure: The vacuum oil filtering is used to remove residue to ensure the pure oil quality and meet the standard ... sunflower seed, peanut kernel, soybean, etc. Before prepressing, you have to pretreat oilseed by cleaning, screening separation, washing, hulling, softening, ... oil crops Third step of pretreatment, by using flaking machine to roll oilseeds into base. About 4 valve. Like Soybean 2- ...