Walnut oil extraction machinery is a key equipment in the walnut oil production process. They use different process principles and technical means to efficiently extract the oil from walnuts. The following is a detailed introduction to walnut oil extraction machinery:
1. Main types
Pressing machine
Screw oil press: Utilize the rotation and propulsion of the screw to send walnuts into the oil pressing chamber for pressing. Driven by the screw blades, walnuts are continuously fed into the pressing section. Due to the reduction of the screw lead and the increase of the bottom diameter, the volume is reduced, resulting in pressure changes, squeezing out the oil. The screw oil press has the advantages of simple structure, convenient operation, and wide application range. It is one of the commonly used equipment in walnut oil production.
Hydraulic oil press: Walnuts are squeezed and oil is extracted through the pressure of the hydraulic system. The hydraulic oil press has the advantages of large pressing force, high oil yield, and good oil quality. It is especially suitable for processing walnut raw materials with high oil content.
Leaching equipment
It is mainly used for large-scale production. The oil is extracted from walnuts through full contact and exchange between the solvent and the walnut. Extraction equipment usually includes extractors, solvent recovery systems and other parts. It has the advantages of high oil yield and high production efficiency, but attention should be paid to the recovery and removal of solvents to ensure the safety of oil products.
Supercritical CO2 extraction equipment
Using the good solubility of supercritical fluids (such as carbon dioxide) under specific conditions, the oil is extracted by adjusting the pressure and temperature of the fluid. This method has the advantages of low extraction temperature and is conducive to retaining the nutrients and natural flavor in the oil, but the equipment cost is high and it has not yet been widely popularized.
2. Auxiliary equipment
In the process of walnut oil extraction, some auxiliary equipment is also needed to support the production process, such as:
Crusher: used to crush walnuts into small pieces or powder suitable for extraction.
Dryer: Dry the crushed walnut kernels to improve the oil yield and oil quality.
Filtration equipment: used to filter impurities and residues in the extracted walnut oil to ensure the purity and quality of the oil.
Centrifuge: further separate and purify walnut oil to improve the purity and stability of the oil.
The extraction process of walnut oil is a complex and delicate process, which aims to efficiently extract high-quality and high-purity oil from walnuts. The following is a detailed introduction to the walnut oil extraction process:
Ⅰ. Raw material preparation
First, select high-quality walnuts as raw materials, which is the basis for ensuring the quality of walnut oil. The raw walnuts need to be strictly screened and cleaned to remove impurities and unqualified products, and then shelled for subsequent processing.
Ⅱ. Crushing and pretreatment
The shelled walnut kernels are crushed to make them into small pieces or powder suitable for extraction. This step helps to increase the contact area between the walnut kernels and the extraction solvent and improve the extraction efficiency. At the same time, the crushed walnut kernels need to be pretreated to a certain extent, such as drying and softening, to improve their physical and chemical properties for subsequent extraction.
Ⅲ. Extraction process
The extraction processes of walnut oil are mainly the following:
1. Pressing method:
Physical pressing: Use an oil press (such as a screw oil press or a hydraulic oil press) to physically press the crushed walnut kernels, and release the oil from the walnut kernels through external pressure. This method can better preserve the natural flavor and nutrients of walnuts, but the oil yield is relatively low and the cost is high.
Hot pressing and cold pressing: Pressing can also be divided into hot pressing and cold pressing. The hot pressing method heats the walnut kernels before pressing to improve the oil yield and oil quality; while the cold pressing method presses at room temperature or lower temperature to better preserve the nutrients and natural flavor in the oil.
2. Extraction method:
The solvent extraction method is used to extract oil from walnut kernels by fully exchanging solvents and utilizing the good solubility of oil in organic solvents. This method has high oil yield, low extraction temperature, high production efficiency, and is suitable for large-scale production. However, the problem of solvent residue is a safety hazard that needs to be paid attention to, so strict solvent recovery and removal treatment is required.
3. Supercritical CO2 extraction method:
Using the good solubility of supercritical fluids (such as carbon dioxide) and the variable solubility under pressure and temperature changes, oil is extracted by adjusting the density of supercritical fluids. This method has a low extraction temperature, which is conducive to the preservation of bioactive substances in oils and fats, and carbon dioxide is safe and pollution-free as an extractant. However, it has high equipment requirements and high production costs, and it is currently difficult to carry out large-scale production and application.
4. Other methods:
Such as water substitution, water enzyme method, ultrasonic assisted extraction method, etc. have also been studied and applied to a certain extent. These methods have their own advantages and disadvantages, but have not yet become mainstream extraction processes.
IV. Filtration and refining
The extracted walnut oil needs to be filtered to remove impurities and residues. It is then refined to remove bad odors, colors and impurities and improve the quality of the oil. The refining process may include steps such as deodorization, decolorization and removal of impurities.
V. Packaging and storage
The refined walnut oil needs to be packaged to prevent oxidation and contamination. The packaging material should have good sealing and light-proof properties. The packaged walnut oil should be stored in a cool, dry and ventilated place, avoiding direct sunlight and high temperature environment.
Walnut oil extraction machinery is not restricted by region and can be used nationwide and even globally. Whether it is the main walnut producing area or other areas with demand or processing capacity for walnut oil, suitable walnut oil extraction machinery can be selected for production according to local market demand, raw material supply and production cost.
Walnut oil extraction machinery is suitable for enterprises of different sizes, including small, medium and large oil mills.
Small oil mills or workshops:
For oil mills or workshops with smaller production scales, equipment such as screw oil presses or small hydraulic oil presses can be selected. These equipment are simple to operate, occupy a small area, and have relatively low investment costs, which are suitable for initial trials or small-scale production.
Medium-sized oil mills:
Medium-sized oil mills can choose medium-sized screw oil presses, hydraulic oil presses or leaching equipment according to production needs. These equipment have high oil yield and production efficiency, can meet the production needs of medium-sized oil mills, and ensure the quality and stability of oil products.
Large oil mills:
Large oil mills are more inclined to choose large hydraulic oil presses, continuous leaching equipment and other equipment with high automation. These equipments have high production efficiency, large capacity and stable oil quality, which can meet the large-scale production needs of large oil mills and reduce production costs and labor intensity.
Walnut oil extraction machinery is widely used in enterprises of different regions and sizes. Enterprises can choose appropriate equipment for production according to their actual conditions.
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