Cleaning: Remove leaves, sticks, stones, sand, dirt and metal contaminants. This process is usually referred to cleaning and scaling equipment including strainers, planners, peeling machines, magnetic tools and belt conveyors, etc.

Dehulling: Most oilseeds need to remove abrasive shells before oil is extracted, as the oil content of the shell and hull is less than 1%. In addition, shelling can not only improve the efficiency of oil extraction equipment, increase the efficiency of oil production, but also reduce the wear of the oil expeller. Dehuller is commonly used in this process.

Crushing and Flaking: Most oilseeds require size reduction before oil extraction. Crushers and flakers are used in this process. Some small seeds, such as corn germ, rapeseed and canola, do not need to be grounded.

Cooking: Heating the seeds is an option, but not required. This can increase the efficiency of extraction and protein availability.

Extruding: Through extruder, the oil-pressure material will be expanded due to sudden pressure-relief, meanwhile the steam in the material suddenly evaporates, so the material Is created in a subtle way. Structure and extended to irregular particles.