What is the difference between hot pressing and cold pressing in an oil press

Oil presses are divided into hot pressing and cold pressing technologies. What are the differences in processing technology, oil characteristics, and application scope? Let me introduce them to you:

• Processing technology
• Hot pressing: The hot pressing process requires high-temperature heating treatment of the oil before pressing, usually including steps such as cleaning, crushing, and roasting. During this process, a series of physical and chemical changes occur inside the oil, such as damaging oil cells, promoting protein denaturation, reducing oil viscosity, etc., making it more suitable for oil extraction and increasing oil yield.
• Cold pressing: The cold pressing process does not require heating treatment of the oil, and is usually carried out in an environment below 60 ℃. This method can more fully preserve the physiological active substances and natural flavor in the oil.
• Product characteristics
• Hot pressed oil: Hot pressed oil usually has a darker color and a particularly fragrant aroma, because the aroma components in the oil are fully released during the high-temperature roasting process. Meanwhile, due to the high oil yield of hot pressing, hot pressing oil is more common in the market and relatively affordable in price. However, the high-temperature oil extraction process can also lead to significant loss of some bioactive substances in the oil, such as vitamin E, sterols, carotenoids, etc.
• Cold pressed oil: Cold pressed oil has a lighter color and a relatively poor odor, but it has a good color and retains more natural flavor and color. Meanwhile, due to the avoidance of high temperature damage to the oil during the cold pressing process, the content of physiologically active substances in cold pressed oil is higher, which is more in line with the needs of the human body. However, the oil yield of cold pressed oil is relatively low, resulting in a higher market price for cold pressed oil.