Hot & Cold Pressing Of Walnuts

  The oil extraction process of walnut oil is generally divided into two types, one is cold pressing and the other is hot pressing.

The difference between hot pressing and cold pressing

  Generally, the cold pressing method is processed in an environment below 60°C and sent to the oil press for pressing. Cold pressing does not require heating or frying the oil. The oil yield is low, the oil color is light, there are few impurities, and more oil can be retained. of nutrients. Generally, no refining is required, and refined oil is obtained after precipitation and filtration. The oil squeezed out in this way has pure natural characteristics and avoids the adverse effects of high-temperature oil processing. Hot pressing of oil requires first selecting and crushing the oil and then subjecting it to high-temperature heating, which causes a series of changes inside the oil, which easily destroys cells and protein components, reduces the viscosity of the oil, and removes the biologically active substances in the oil during the pressing process. A large amount of loss greatly reduces the nutritional value of walnut oil.

Loss of oil nutrients caused by different oil extraction methods

  Cold-pressed oil completely preserves the physiologically active substances in the oil, such as vitamin E, which has anti-aging functions, and sterols, which have skin-building effects and enhance human metabolic functions, which are more in line with the needs of the human body. During hot pressing, high-temperature oil extraction causes bioactive substances in the oil, such as vitamin E, sterols, carotenoids, etc., to be greatly lost during the pressing process.

Yield is different

  Cold-pressed oil has purely natural characteristics, avoiding the adverse effects of traditional high-temperature oil pressing and processing, and retains the natural flavor and color of the oil, but the oil yield is low. Hot pressing is the process of frying and roasting oil crop seeds and then squeezing them out. It has a special smell, darker color and higher yield.

smell different

  Cold-pressed seeds are not roasted and have a light smell and oily taste, but the color is good. Hot-pressed oil has a particularly fragrant smell and darker color. Therefore, from the above comparison, cold-pressed walnut oil is better than hot-pressed walnut oil and has higher nutritional value.

Cold-pressed walnut oil process: walnuts → shelling → walnut kernels → hydraulic oil press → filtering → crude oil

Machine Parameter:

Details Picture:

It is suitable for pressing walnuts, sesame, almonds, pine nuts, especially for extra virgin olive oil,avocado, shea butter oil and other oils. High cost-effectiveness and is particularly suitable for small and medium-sized oil processing plants. There are advantages following:

1.Large squeezing force and low noise.

2.Fast efficiency.

3.Simple operation and convenient maintenance.

4.Wide using range, Occupied workshop area is small.

5.High hardness and strength, good abrasion resistance and long using life.

6.Oil retains a lot of nutrients and has high nutritional value.

Ruian Every Machinery (MCRAYONE) is located in Zhejiang province, China. Our annual production capacity of oil press machines and related machines is around 10,000 sets. These machines have sold to all over the world, such as South Africa, Nigeria, America, India and so on. Thanks to our experience in the oil press industry (more than 40 years ), we know the demands and best-selling models of each market, so we can provide the most suitable machines to our customers.

We have an experienced engineer team, a professional Research and Design department, and a perfect Quality Control System. All the parts are made by our own factory and the quality can be guaranteed. In addition, we provide a quality warranty for one year.

Our business involves in small-sized oil pressing series, oil engineering designing, equipment manufacturing and installing, project contracting, technical service and so on. Moreover, we have important partnerships with many large Chinese companies, such as China Oil and Food Import and Export Corporation. We are their designated foreign trade exporter and their supplier for small oil presses.

Our goal is to establish a long-term relationships with our customers, based on providing quality machines at a reasonable cost and maximize the customer returns with comprehensive service.

In the course of our company's decades of development, we have obtained multiple official certificates, such as :

• ISO-9001 international quality system certification
• CE certificate
• China's AAA credit enterprises
• Certification for honoring contracts and keeping promises
• Certificate of Integrity management demonstration unit
• Certificate of Quality Service Integrity Unit
• Enterprise Credit Rating Certificate

Our company has grown into one of the leading oil press manufacturers in China, and our popularity has spread abroad. We welcoming all kinds of orders.