An oil press refers to a machine that squeezes oil out of oil with the help of external mechanical force. It can be divided into household oil press, hydraulic oil press, screw oil press, new hydraulic oil press, and high-efficiency fine filter oil press. There are two main types of oil presses: hydraulic presses (also known as hydraulic presses) and screw presses. The hydraulic oil press is suitable for pressing small batches and needs to retain the original flavor of oil, such as sesame oil, olive oil, walnut oil, etc. The screw oil press has large production capacity and high oil yield, and is a common oil press equipment . At present, there are many names for oil presses on the market, including automatic oil presses, multi-functional oil presses, vacuum oil presses, new oil presses, and oil presses with integrated filtering and filtering. In fact, they all belong to screw presses. oil machine.

squeezing

        There are two process methods for extracting edible oil from plants, chemical oil extraction method and physical oil extraction method, which is what we usually call leaching method (chemical) and pressing method (physical):

        Pressing method: The pressing method has a long history, and its technological process is relatively simple: after steaming and frying the oil, the oil is squeezed out of the oil by mechanical methods. The ancient pressing method requires the operator to pay heavy manual labor. In the extruded oil residue (oil cake), the residual oil content is quite high, thus wasting extremely valuable oil resources. The modern pressing method is an industrialized and automated operation, but the problem of high residual oil content in the oil residue still cannot be solved.
From the pretreatment of pressed raw materials, there are cold pressing method and hot pressing method, also called cooked pressing method. Cold pressing means that the raw materials are directly put into the oil press to squeeze out the oil without roasting or steaming. In this method, the color of the oil is relatively light and the color is brighter, but the oil yield is low, and the oil taste is not strong and mellow. . The purpose of cooked pressing is to dry the oil crops before pressing. The purpose is to reduce the moisture of the raw materials, increase the activity and fluidity of the oil molecules, thereby improving the oil yield and ensuring the fragrance of the oil. But it also destroys the chemical composition of the oil, causing the oil to be darker and darker in color.

The basic process of oil pressing process is as follows:

1. Conventional production process: raw meal--steaming and frying--pressing--machine-pressed crude oil
2. Special oil production process: oilseeds--fried seeds--pressing--filtering--scented oil
3. Special oil production process: oilseeds--cold pressing of whole seeds--filtering--cold-pressed oils and fats

        The process of the oil being squeezed out of the oil: When the oil enters the press chamber of the oil press, the pressure increases as the press chamber rotates. With the extrusion of oil, the seed material is continuously squeezed and squeezed, and the pressure between the directly contacting pressed material particles causes the plastic deformation of the seed material, especially when the oil film is broken and bonded together. In this way, after being squeezed out of the frying chamber, the pressed material is no longer a loose body, but a plastic body called oil cake. During pressing, due to the dual effects of temperature and pressure, the protein will continue to deteriorate, which in turn affects the plasticity of the pressed material.

Principle process

3.1 Principle

(1) Peanut is a crop with high oil content. Its internal oil is spherical or granular in the cell and is surrounded by a closed film. In the process of being squeezed by the outside world, this layer of film and cell wall When they break together, the peanut oil flows out from the cracks; during the extrusion process, the oil in the peanuts is partially squeezed out, and the peanuts become brittle and hard, losing their original elasticity; while the peanut red coat contains more fibers, and the pressure is applied. Then, it is separated from the surface of the peanut, so that the red coat of the peanut is easy to fall off; during the extrusion process, the peanut is subjected to pressure instead of shearing force, so there is no broken kernel phenomenon, and it is easy to restore the original state;

(2) Apply different pressures according to the requirements of fat content. Defatted peanuts with different effects can be obtained.

3.2 Process

Process requirements: The degreasing rate of peanuts is more than 50%; the peanuts are complete without broken particles, there is no adhesion between peanuts, and the red coat of peanuts is easy to fall off. The most important factor affecting the degreasing effect is moisture, and the secondary factor is time. The optimal conditions for reaching the degreasing effect are 4.52%--7.26%.

peanut oil

Peanut kernels Temperature-controlled drying Raw material wrapping Pressurized

Defatted peanut kernels

4 Conclusion

Under the effective conditions of certain pressure, certain moisture, certain temperature and time, the peanut oil can be obtained by using a hydraulic oil press to press the peanut kernels, and the peanut oil with apricot yellow color, original taste, fragrant smell and pure taste can be obtained with different degreasing effects. of peanuts;

advantage

Absolutely no chemical additives are added in the production process using this equipment.

Simple operation, simple and convenient

High oil yield and low pressing cost

Pure oil, rich in nutrients

Optional raw materials, safe and secure

New peanut oil extraction machine

There is a new type of peanut oil extraction machine on the market. This oil press successfully makes up for the defect that the peanut cake cannot be reused after high-temperature pressing of peanut oil. It is successfully retained as whole degreasing peanut kernels, which will make the shape, taste and natural nutrients of the bad peanuts. The machine covers an area of ​​10 square meters. The advantages are that the oil produced has a stronger fragrance than ordinary oil presses, and does not foam during consumption, which is widely welcomed by consumers.

2.1, product analysis:

①Characteristics of the new hydraulic oil press: It adopts the combination of physics and modern technology and has been successfully developed after years of testing. Compared with ordinary oil presses, the new hydraulic oil press has environmental protection and energy saving, high product added value, no loss, physical pressing, No chemical raw materials are added, no environmental pollution, no waste water, waste gas, and waste generation. It is an alternative to traditional oil presses. It is a new type of environmental protection food processing equipment.

②Innovative function of Yuantong hydraulic oil press technology: It has successfully made up for the defect that peanut cake cannot be reused after high-temperature pressing of peanut oil, and successfully designed a kind of peanut oil that will not be pressed into cake when pressed to make peanut oil. , but was successfully retained as whole defatted peanut kernel and its technology;

③ While extracting the raw peanut oil, the peanut red coat and the peanut kernel are separated, without destroying the shape, taste and natural nutrients of the peanut, which is in line with the deep processing of various foods. Peanut kernels can be sold directly; they can also be restored to their original state and processed into green foods with high protein and low fat, such as spicy peanuts, spiced peanuts, fish skin peanuts, Japanese beans, peanut butter and other peanut series foods.

Peanut, as one of the traditional foods loved by the common people, has been known as the "fruit of longevity" since ancient times. There is a folk saying: "Eating peanuts can keep you healthy", research has found that it has certain medicinal value and health care functions.

Maintenance

The lubrication condition should be checked after every 50 hours of operation. The oil cup above the reducer should not be short of oil. The inner bearing of the adjusting screw of the Yuantong press screw should be drawn from the adjusting screw hole and filled with butter once. Dry grinding is strictly prohibited.

The lubricating parts should be protected from dust and other impurities, and the oil quality of the gear box should be checked once a year. If any deterioration is found, all the oil should be replaced.

When the pressing amount is reduced and the cake or oil is not normal, the screw shaft should be pulled out, and the wear of the screw, press bar, cake outlet and cake outlet should be checked, and the worn parts should be replaced in time.

After each work, the residual cake in the machine should be removed, and the dust and grease on the surface of the machine should be wiped clean.

When storing for a long time after the production season, a maintenance should be carried out, and the squeezing screw, pressing rod and cake head should be disassembled, washed, reassembled and oiled, and placed in a dry place.

After each oil extraction, remove the screw shaft to clean the residue, and use a dry cloth and cotton swab to wipe the rotating port to prevent clogging.