Currently, in our daily life, there are two kinds of edible oil production, they are hot pressed oil and cold pressed oil. Just as the name implies, the hot pressing process is under high temperature, the oilseeds should roasting or cooking before pressing. While the cold pressing process is under low temperature, the oilseeds can be pressed without roasting. There exist great differences between cold pressing and hot pressing.
Firstly, The Difference in Pressing Process
In case of cold pressing, the oilseeds do not require any pre-treatment of the input material. The only requirement is that the input oil seed is 98% clean and free of metal and stone particles. The cold pressed oil is pressed under the low temperature of less than 60℃, and the acid value is also relatively low. So there is no need to refine. We would get the oil products after precipitation and filtration.
While, for the hot pressing, the 98% clean, stone and metal free input material is also required, and the oilseedss need more steps before pressing. First, the seeds go through a masher which breaks up the seeds, and meshed material is then heated to 100-120 ℃ in a so-called roaster or cooker. From the cooker the hot oil seeds is loaded directly into the oil press. It occurs a series of changes inside of oil raw materials: damage the oil materials cell, bring protein denaturation, reduce oil viscosity, etc, so that convenient to press oil and improve oil yield. The fragrance of sesame oil and superfine fragrant peanut oil must be got from hot pressing. Also, the raw oil is relatively dark after high temperature treatment, the acid value will rise, so the crude can be edible only after refining.
Secondly, The Oil Quality is different
The cold pressed oil is with natural properties, it keeps the original flavor of oil plants, green and environmental protection. Especially suitable for pressing organic plants and economic crops with high added value, such as olive, walnut, grape seed, linseed oil and other oil crops. It could avoid the adverse effects caused by traditional high temperature, retain the physiological active substance and its original taste and flavor. It is a pretty good choice for healthy life. With the development of the quality of life in recent years, people more and more like cold press oil about vegetable oil.
Hot pressed oil is with pure taste. The oil plants are pressed after fried. It smells good especially for oil plants like sesame seeds. while there are a series of changes in the oil plants. The process will destruct the plant cells, denature the protein, reduce oil viscosity, and improve the yield efficiency. What’s more, the bioactive substances in the oil such as vitamin E, sterol, Carotenoid will endure massive loss. It especially for oil plants with rich oil content like peanut and sesame, the oil produced is more fragrant after hot pressing.
Thirdly, The Oil Yield Is Difference
The oil yield achievable through cold pressing is typically between 34,5-35,9% of the total weight of the input material (in case of 42% oil content), it needs second and even third pressing, while the oil yield in case of hot pressing technologies is normally between 35.7%-37.8% at the same time.
The Fourthly, They Apply To Diverse Raw Material
They apply to diverse raw material. The cold pressed oil is always squeezed below 60℃. Some oil seeds such as camellia, coconut, flaxseed, hemp and olive seeds are suitable for that. However, the mashed material is then heated to 100-120℃ in a so-called cooker in the hot oil processing. Let’s take soybean, high erucic acid rapeseed, cottonseed, peanut and sesame for instance. The produced oil must be processed through oil refinning process, Because there is beany flavor in soybean oil, spicy flavor in high erucic acid rapeseed oil, toxin-cottorrpherol in rapeseed oil and aflatoxin in degenerative oilseeds. All above must be refined. Also the flavor of sesame oil and fragrant peanut can be got only after hot processing.
The Fifthly, The Market Is Different
Cold pressed oil is nice and shallow in color. There is no foam when frying. But it’s not so fragrant, and may have unripe flavor, tasting not so good. Hot pressed oil has a pure flavor. It’s fragrant, especially sesame and peanut which have rich oil. The disadvantage is that there will be foam when frying if without processing. But just simple treatment can solve this problem.
The Lastly, The Processing Equipment is Different
Zhengzhou Double-lion Grain & Oil Machinery Co., Ltd. Offers different oil press machines and ancillary equipment, such as screw oil press, automatic oil press, hydraulic oil press, peanut sheller, oil seed roaster, walnut sheller. As for hot pressing, our engineer recommends you can use hydraulic oil press, while hot pressing, the automatic oil press and screw oil press is your best choice. The following is the automatic press and hydraulic press working video.
Considering all above, when choosing between cold and hot pressing technologies, you must always consider what you need clearly. If you like fragrant flavor, you can select screw oil press or automatic oil press. If you're more inclined to health, you can select the hydraulic oil press. Double-lion offers all kinds of oil press equipment for you, look forward to the cooperation with you.
Zhengzhou Double-lion Grain & Oil Milling Machinery Co.,ltd. is dedicated in oil press machine design & manufacturing. Cooperating with Henan University of Technolog，it has carried out the new technological research and application of oil machinery, screw oil press machine, integrated oil press machine, hydraulic oil press machine, soybean oil press machine, sesame oil press machine, rapeseed oil press machine, palm oil press machine, etc., and transformed the latest scientific achievements into productive forces to obtain good social and economic benefit. Many foreign friends have established long-term cooperative relationship with us.
Need guidance to start a oil press machine business? Please contact us, our engineer will give you professional guidance and suggestion.
Type: automatic oil press, screw oil press, integrated oil press, hydraulic oil press, sesame oil press machine, peanut oil press machine, rapeseed oil press machine, palm oil press machine. Get in touch with us.
How to Get in Touch with Zhengzhou Double lion Flour Mill Manufacturer
Email: info@zzdoublelion.com
Whatsapp: +8613849022317 (Sophia)
Wechat: +8613849022317 (Sophia)
Add:Lotus street NO.100,Hi-tech development zone, Zhengzhou, Henan, China.
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