By Blake Jackson
An oilseed press is central to any oil extraction operation, but the performance of the press largely depends on the quality and cleanliness of the seeds being processed.
Oilseeds such as canola, sunflower, soybeans, and pennycress contain enough oil to make extraction worthwhile. Before pressing, these seeds are often stored for varying periods, and maintaining their quality during this time is crucial to producing high-quality oil.
Proper cleaning and storage prevent contamination from mold, weed seeds, or debris, all of which can affect oil purity and damage pressing equipment.
Clean seeds not only ensure better oil but also extend the lifespan of the press and other handling components.
Why Store Oilseeds
Storing oilseeds offers several advantages. Since oil in seed form does not become rancid, seeds can be pressed only when oil is needed. Pressing operations are generally slower than harvest, so storage allows for a steady supply.
Additionally, because crops are harvested at different times, storage enables farmers to manage multiple harvests efficiently.
Why Clean Oilseeds
Cleaning is essential to remove weed seeds, stones, and other materials that could interfere with oil extraction, alter oil flavor, or wear down machinery.
Oilseeds can be cleaned before or after storage, though pre-storage cleaning helps prevent mold and heating if significant debris is present.
Seed Cleaning Process
Seed cleaners, which have remained largely unchanged over decades, use gravity and air separation to sort seeds by size and density. Screens remove oversized and undersized material, while air flow separates lighter contaminants from heavier seeds.
Farmers can purchase new or used cleaners, but older models may require safety upgrades such as enclosed drives and updated wiring.
Moisture and Storage
Oilseeds must be stored at a safe moisture content generally below 10% to prevent mold or bacterial growth that could make oil unsafe for consumption.
Moisture levels can be quickly tested using a moisture meter or calculated by drying and reweighing seed samples. Keeping seeds clean and dry ensures both oil quality and equipment longevity in any oilseed pressing operation.
Photo Credit: gettyimages-ligora
Categories: Pennsylvania, Crops, Soybeans