pressing
Quick Summary
Food processing encompasses any operation that makes raw foodstuffs suitable for consumption, cooking, or storage. This includes basic preparation, transforming food into new forms like preserves, and employing preservation and packaging techniques. Innovations in food processing have led to new products such as concentrated juices and instant foods, utilizing diverse sources like oilseeds and aquatic plants.1
Pressing is a mechanical method used in fat and oil extraction, particularly for oilseeds and nuts where oil is held within cellular structures. This process involves breaking down the material through grinding or flaking, followed by pressing in hydraulic or screw presses. Oils extracted without heating are known as cold-pressed or virgin oils, often suitable for consumption without further refining. Heating the material before pressing allows for greater oil extraction and removes more impurities, resulting in a more colored oil. Pressing machines, with historical roots in Roman screw presses, have evolved to modern screw presses that offer continuous operation and higher oil yields.23
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