Hydraulic oil press is a device that uses hydraulic transmission technology to squeeze oil to extract oil. It is widely used in small and medium-sized oil processing scenarios. The following is an introduction from the core principles, main types, applicable scenarios, etc.:

Working principle

The core is to generate high pressure (usually up to tens to hundreds of MPa) through the hydraulic system, place the oil in the pressing chamber, use the oil cylinder to push the pressing plate to apply continuous pressure to the oil, so that the oil cells are broken, and the oil is separated from the oil, and then collected through the oil receiving device. The whole process relies on the conversion of hydraulic energy into mechanical energy to achieve efficient pressing.

Main types

According to the operation mode: it can be divided into manual hydraulic oil press (suitable for small batch use in the home, simple operation) and fully automatic hydraulic oil press (automatic pressurization, pressure maintenance, and pressure relief are achieved through electrical control, suitable for small processing plants).

Pressing temperature: including cold pressing models (pressing temperature ≤ 60℃, retaining nutrients) and hot pressing models (oil needs to be preheated, with a high oil yield).

Features

1. More complete retention of nutrients

The cold pressing process avoids the destruction of active substances in oil by high temperature, and can retain nutrients such as vitamins (such as vitamin E), unsaturated fatty acids (such as oleic acid, linoleic acid), and phytosterols in oil to the greatest extent, with higher nutritional value.

2. Purer oil and more natural flavor

Cold pressing does not require high-temperature stir-frying of oil, which reduces the possibility of oil oxidation and rancidity. The oil color is lighter, with fewer impurities, and the taste is refreshing without burnt smell.

It can retain the natural aroma of the oil itself (such as the fragrance of sesame oil and the original flavor of walnut oil), suitable for direct consumption or use as high-end oil.

3. Reduce the production of harmful substances

High temperature may increase the activity of harmful substances in oil (such as aflatoxin) or produce trans fatty acids, etc. Cold pressing reduces such risks, making edible oil safer.

4. Higher utilization rate of by-products

The cold-pressed cake (residue) is not damaged by high temperature, and the protein, dietary fiber and other components are well preserved. It can be more conveniently used for secondary processing such as feed and food additives to improve resource utilization.

5. More suitable for specific oil processing

For oils rich in unsaturated fatty acids or heat-sensitive ingredients such as walnuts, almonds, and flax seeds, cold pressing can avoid nutrient loss and is an ideal choice for producing high-end healthy oils.

6. Compact structure

The equipment is usually small in size and occupies a small area, which is suitable for small and medium-sized production scenarios.

7. Easy maintenance

The core components (such as hydraulic cylinders and pressing chambers) have a relatively simple structure, and daily maintenance and troubleshooting are relatively convenient.

Application

1. Small edible oil processing: family workshops and small processing plants in townships are used to produce common edible oils such as peanut oil, rapeseed oil, and sesame oil.

2. Special oil processing: For special oils such as walnuts, almonds, and perilla seeds, high-end healthy oils are produced through cold pressing.

3. Agricultural product processing assistance: In rural areas, provide farmers with oil processing services to increase the added value of agricultural products.

4. Experimental production: used by scientific research institutions or enterprises for oil pressing process experiments, parameter optimization, etc.

In short, the cold pressing process emphasizes "natural, healthy, and nutritious", and is suitable for scenarios with high requirements for oil quality, such as high-end edible oil, health oil production, etc.