Hydraulic Cold-Pressed Olive Oil Process

Our MCRAYONE hydraulic press is specially developed for premium extra virgin olive oil production with precise pressure regulation to satisfy EU cold-press standards.

I.Pressing Principle: The hydraulic press relies on hydraulic cylinders to apply pressure statically and slowly (without frictional heat generation). The entire cold-pressing process maintains a temperature control of ≤27℃, meeting EU extra virgin olive oil standards. Oil residue is separated by a filter cloth, allowing the oil to slowly seep from the olive pulp. High temperatures do not destroy polyphenols, vitamins, or fruit aroma, making it the preferred process for high-end organic olive oil. Standard pressing pressure: 35–60 MPa, with staged pressure increases and holding periods.

II.Complete Production Process

• Fresh Fruit Pre-treatment

1. Process within 24 hours of harvesting, removing withered branches, rotten fruit, and moldy fruit;
2. Wash with clean water spray and allow to drain naturally (moisture content controlled at 48%–55%);
3. Crush the whole fruit (including pits, with pits assisting in oil extraction) using a stone mill/crusher to create a fine olive pulp.

• Fruit Puree Blending (Key for Aroma Enhancement and Oil Extraction): Add the fruit puree to the mixing tank and stir slowly at a low temperature (18-22℃) for 30-50 minutes. This allows tiny oil droplets to coalesce and enlarge, increasing oil yield and releasing natural fruit aroma. Temperature must not exceed 27℃.
• Packing and Pressing: Pack the fruit puree into food-grade synthetic fiber filter bags/fiber filter discs, stacking them neatly in layers before placing them into the hydraulic press chamber. Ensure each stack has a uniform thickness to prevent uneven pressure and leakage.

#The exterior of the silver hydraulic oil press

• Segmented Hydraulic Pressing (Core):

1. Low-Pressure Pre-pressing (10-20MPa): 15-30 minutes, slowly draining free oil and water from the fruit puree;
2. Medium-Pressure Increase (30-45MPa): 60-90 minutes, significant oil seepage;
3. High-Pressure Holding (50-60MPa): 30-60 minutes, extracting all remaining oil. Each pressing cycle lasts 2-3 hours, yielding a mixture of crude oil and plant juice (oil-water mixture).

•  Oil-Water Separation and Refining

1. The mixture is placed in a settling tank and allowed to stand for 12-24 hours. It separates into layers based on density, with the upper layer being extra virgin olive oil and the lower layer being pomace and wastewater.
2. The upper layer of crude oil is coarsely filtered → finely filtered through cotton filtration to remove fine fruit pulp impurities. It can be bottled as extra virgin oil without chemical refining.
3. The pressing residue (oil cake) can be pre-pressed again or used as animal feed or organic fertilizer.

III.Advantages and Disadvantages of Hydraulic Pressing of Olive Oil

•  Advantages

1. Top-quality oil: Low-temperature cold pressing throughout the process preserves olive polyphenols, natural fruit aroma, and nutrients. Acidity ≤0.8%.
2. Extremely low impurities: Static pressing prevents the introduction of metal debris, resulting in clear crude oil and low filtration costs.
3. Suitable for small workshops/organic estates: Flexible single-machine operation, suitable for niche olive oil brands (mainstream processes in Spanish and Italian estates).
4. Intact pomace, high added value of by-products.

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.