Oil press machine, as a device for extracting vegetable oil from plant raw materials, is important in the modern oil industry. SIMEC will conduct a popular science discussion on the functionality of oil press, aiming to briefly introduce its working principle, classification and application.
Application of oil press machine Oil press machines are widely used in pressing various oil crops, such as soybeans, peanuts, cottonseeds, rapeseeds, and sesame seeds, etc. Through advanced technology and design, they achieve efficient pressing, improving oil yield. Equipped with automatic control systems, they ensure the stability and safety of the pressing process, while emphasizing energy conservation and environmental protection. These machines utilize low energy consumption and exhibit high efficiency.
Oil press machines can also equip the functions of impurity removal, refining, filtration, etc., to achieve integrated production and improve production efficiency and product quality.
Classification of oil press machine Oil pressing machines can be divided into many types according to their structure and pressing methods. Common ones include screw oil press machine, hydraulic oil press machine, etc. These different types of oil pressing machines have their own characteristics in pressing efficiency, oil yield, application scope, etc., and can meet the pressing needs of different oil crops.
Screw oil press machine works by physically pressing pre-treated oil material. The material enters the pressing chamber via a hopper, where a rotating screw pushes it. The resulting high pressure generates friction, causing movement and heat. The screw’s design, with a gradually increasing diameter and decreasing pitch, enhances pressing efficiency and thermally denatures proteins, facilitating oil precipitation.
Hydraulic oil press machine adopts cold processing technology to extract oil. It provides 200-380 tons of vertical pressing force on oil material, but will not generate friction and heat. The oil material will not be heated, no temperature rise during oil extraction process, hence no protein denaturing, no nutrients loss. The continuous high pressure is generated by hydraulic station, controlled in automatic mode. The electricity consumption of oil extraction process is much lower than screw oil press.
Oil press machine in modern life Oil press machines are widely utilized in modern life, not only in the traditional oil processing industry but also gradually in non-food industry fields such as pharmaceuticals and chemicals. At the same time, with people’s increasing attention to healthy eating, home use oil pressing machines have gradually become popular, so that people can make healthy and safe cooking oil at home.
Through continuous technological innovation and equipment upgrading, SIMEC oil pressing machine will further improve the pressing efficiency, oil yield and product quality, and provide more convenience and protection for people’s healthy diet and life. More and more fields of use can also be explored, if you have new ideas, you can also discuss with SIMEC, we’d love to make progress in communication.
For avocado enthusiasts seeking to create a portable and healthier snack, the following four dehydration methods provide solutions.
Food Dehydrator Method The most common and well-known way to dehydrate avocados is to use a dehydrator. This is the quickest and most efficient dehydration process, taking only a few hours.
To dehydrate avocados using a traditional dehydrator, you can follow these steps: 1. Take your room-temperature avocado and cut it into thin slices, about 3mm thick. 2. Place the slices in a single layer on a dehydrator tray. 3. Set the dehydrator temperature to 57℃ and let it run until the avocado slices are dehydrated, which can take anywhere from 8 to 12 hours, depending on the dehydrator and the thickness of the slices. 4. Check the slices every few hours to see if they are dry, and rotate the trays. 5. Once they are dry and leathery, with an apperance similar to fruit leather, remove the slices from the dehydrator and allow them to cool completely. 6. Store the dehydrated avocado slices in an airtight container or resealable plastic bag in a cool, dark place.
Setting of Dehydrator Temperature in Commercial Applications: When dehydration begins upon the introduction of food, the ongoing evaporation of moisture from the food extracts heat, causing the actual temperature within the chamber to be approximately 20 degrees Fahrenheit lower than the set temperature. This phenomenon is considered normal. As the moisture content in the food decreases, the temperature within the chamber gradually rises to approach the predetermined set value.
Air Drying Method Air drying avocados is one of the simplest methods for dehydrating avocados. This method works best in a dry and warm environment. It is helpful to lay the avocados on a drying rack or dehydrating screen to ensure proper air circulation and even drying.
To air-dry avocados, follow these steps: 1. Cut the avocado in half and remove the pit. 2. Place the avocado halves cut-side up on a paper towel to absorb excess moisture. 3. Leave the avocados to air-dry in a warm, dry place for a few days or until the cut surfaces have become firm and slightly wrinkled. 4. Store the air-dried avocados in an airtight container until ready to use.
You should note that air-drying avocados can help prolong their shelf life, but it won’t prevent them from eventually going bad. You should still use or freeze them within a few days.
Oven Drying Method Oven drying is a method of dehydrating used to extend the shelf-life of food for people interested in long-term food preservation. Many people who do not have or want to purchase a traditional dehydrator choose to use this method of dehydrating their food.
To oven-dry avocados, follow these steps: 1. Preheat the oven to 93℃, or the lowest temperature your oven allows. 2. Cut the avocado into thin slices, approximately 3mm thick. 3. Place the slices on a baking sheet lined with parchment paper or a silicone baking mat. 4. Bake the slices in the oven for 4 to 6 hours, or until they are dry and slightly leathery in texture. 5. Check the slices every hour and rotate the baking sheet if necessary to ensure even drying. 6. Once they are dry, remove the slices from the oven and let them cool until they reach a crispy texture. 7. Store the oven-dried avocado slices in an airtight container or resealable plastic bag in a cool, dark place.
When oven-drying avocados, it can be a slower process compared to using a dehydrator. It’s important to keep a close eye on the avocados and monitor them regularly to avoid over-drying, which can cause them to become too brittle and lose their flavor and nutrients.
Sun Drying Method If you live in a sunny and warm climate, you can use the sun to dry your avocado slices. This method takes the longest, but it’s also the most natural and eco-friendly way to preserve all the health benefits of avocados.
Sun-drying avocados is a traditional method of preserving food. However, achieving consistent results can be challenging, and it may pose food safety risks if not done correctly.
Here’s how to sun-dry avocados: 1. Cut the avocado into thin slices, approximately 3mm thick. 2. Place the slices on a clean, flat surface that has been covered with a layer of cheesecloth to prevent contamination. 3. Position the surface in a sunny, well-ventilated area where the temperature will remain between 35°C and 46°C for several days. 4. Turn the slices every few hours to ensure even drying and to prevent mold or spoilage. 5. Continue drying the slices until they are dehydrated and slightly leathery. This process could take anywhere from 2 to 5 days, depending on the weather conditions. 6. Store the sun-dried avocado slices in an airtight container or resealable plastic bag in a cool, dark place.
If you choose to sun-dry avocados, remember that it can be a slow and unpredictable process. It’s important to regularly monitor the slices to ensure they are drying properly and to prevent contamination. Using a dehydrator or oven to dry avocados offers a more controlled and consistent drying environment.
Avocado oil has become common in kitchens around the world, renowned for its rich health benefits and wide applicability in cooking. On the shelves of supermarkets, different types of avocado oil attract the attention of consumers with their diverse packaging and labels, such as “extra virgin avocado oil”, “virgin avocado oil” and “pure avocado oil” and other names frequently appear. If you purchase avocado oil in bulk, you may come across a producer offering significant differences in price regarding “extra virgin avocado oil” versus “crude avocado oil”. What are the core differences between them? Let’s take a deep dive into the world of avocado oil and learn the difference between regular avocado oil and extra virgin avocado oil.
Since avocado oil lacks universally defined quality parameters, people usually use the recommended values for olive oil as a reference. The quality standards for olive oil can be found in the Codex Alimentarius and the International Olive Council’s regulations.
Actually, a classification method for avocado oil can be developed based on its extraction method and fruit quality.
Avocado Oil Classification: Extra virgin avocado oil Definition Method: Avocado oil of a higher quality, “extra virgin”, corresponds to that produced from high-quality fruit, extracted only with mechanical methods, using a temperature below 50 °C and without the use of chemical solvents.
Avocado Oil Classification: Virgin avocado oil Definition Method: “Virgin” avocado oil is produced with fruit of a lower quality (with small areas of rot and physical alterations), extracted by mechanical methods, using a temperature below 50 ° C and without the use of chemical solvents.
Avocado Oil Classification: Pure avocado oil Definition Method: “Pure” avocado oil is a type of oil for the production of which the quality of the fruit is not important; it is a bleached and deodorized oil, infused with the natural flavor of herbs or fruits. “Pure” edible avocado oil is a product with at least 98.5% refined avocado oil.
Avocado Oil Classification: Mixed avocado oil Definition Method: “Mixed” avocado oil is combined with olive, macadamia, and other oils. Therefore, it presents sensory and chemical characteristics that are variable.
Avocado Oil Classification: Crude avocado oil Definition Method: The “crude oil of avocado” is a slightly amber-colored fatty liquid, obtained by physical extraction of the avocado pulp and the seed of the avocado fruits.
In actual trade activities, avocado oil can be classified according to different levels of free fatty acid content. (% m/m expressed in oleic acid)
It is imperative to discuss the extraction methods of avocado oil: refining and physical pressing. Refined avocado oil is commonly refined, involving processes like filtering and deodorization, resulting in a neutral- flavored oil with a higher smoke point. Extra virgin avocado oil undergoes physical pressing, a cold processing technique that preserves the fruit’s natural flavors and nutrients by pressing the avocado oil at low temperatures. This gentle extraction method yields an oil with a distinct flavor profile and lower smoke point.
As a technology and equipment supplier, SIMEC focus on the extraction method of extra virgin avocado oil. Adopting SIMEC physical pressing method, there’s no heating for the avocado pulp and no temperature rise during the cold extraction process of avocado oil. The quality of avocado oil can achieve the procurement standard in cosmetic and food industries.
As a prominent manufacturer of hydraulic oil press, SIMEC has successfully secured a repeat order for two HOP-50/280 hydraulic presses from one of its esteemed and long-standing clients in Egypt. This recent procurement underscores the client’s satisfaction with the performance and quality of the SIMEC hydraulic press, which was installed in 2019 for the production of cold-pressed flaxseed oil and peanut oil.
At SIMEC, we are dedicated to delivering bespoke solutions that address our customers’ diverse technical requirements and local regulatory. Our unwavering commitment to customization and innovation guarantees that our hydraulic oil presses not only exhibit superior performance but can also be precisely tailored to meet each customer’s distinct needs.
SIMEC recognizes and prioritizes the unique needs of each customer, which is why we have meticulously designed the HOP-50/280 hydraulic press to align perfectly with their specific requirements and expectations. To further enhance user experience and ensure optimal performance in hot environments, such as tropical regions, SIMEC has customized a ventilation fan system for control cabinet of hydraulic oil press. This thoughtful design plays a crucial role in the daily operation of the hydraulic oil press. The ventilation fan efficiently expels accumulated hot air from the control cabinet, effectively maintaining an appropriate operating temperature for electrical components. This feature significantly reduces the risk of performance degradation or failure due to overheating. Consequently, it not only extends the service life of electrical components but also lowers maintenance costs, providing customers with a more stable and reliable equipment usage experience.
Furthermore, based on the specific installation requirements of our customer, SIMEC has designed dual steel barrels featuring a unique capability: they can be easily separated into two distinct parts. This flexibility significantly streamlines the installation process and allows our customers to seamlessly integrate the hydraulic oil press onto the operation platform within their workshop. Moreover, the customer has ordered additional spare parts to support their existing hydraulic oil press machines.
The oil press machines and spar parts will be delivered to Alexandria sea port, Egypt on 18th September, 2024. Shipping time is about 50 days.
The video was taken in Ivory Coast by a client who focus on shea oil production using SIMEC hydraulic oil press.
Shea oil is extracted from shea nuts at a temperature above 34 °C. Shea oil emits a potent aroma. It is utilized extensively for moisturizing and softening skin and hair. The oil transforms to butter below 34 °C. Shea butter is solid and waxy in appearance at room temperature.
Shea nuts grow on the shea tree which is indigenous to the savanna regions of West and Central Africa on the African continent. The tree is often called the shea butter tree. The shea fruit consists of a thin, tart, nutritious pulp that surrounds a relatively large, oil-rich seed from which shea oil is extracted.
On October 23, 2023, SIMEC delivered HOP50/280 hydraulic oil press to New Zealand. The client is specialized in hemp plantation and R&D of hemp-based products. The hydraulic oil press will be installed to produce extra virgin hemp seed oil, which has become a popular food supplement in people’s daily diets due to its numerous health benefits.
The cold-pressed organic hemp seed oil contains an ideal balance of omega-6 to omega-3 fatty acids, which are essential for our bodies but cannot be produced internally. Cold-pressed hemp seed oil offers numerous benefits for metabolism, gut health, heart health, nervous system, brain health, joints and mobility, sleep health, muscle recovery, women’s health, skin and hair health.
Compared to fish oil or other animal-based oil supplements, extra-virgin hemp seed oil stands out as a plant-based, cold-processed, and extra-virgin option. Additionally, hemp seed oil made through extra-virgin cold pressing has a delicious nutty taste.
Equipped with robust hydraulic system, SIMEC machine presses raw hemp seeds with 380 tons of vertical force, resulting in a high yield of extra-virgin hemp seed oil. The dual-barrel design also improves production efficiency. All material barrels and parts in contact with hemp seeds and oil are made of food-grade SUS 304 stainless steel
“Regarding our future plans, we aim to expand our production of organic unrefined hemp seed oil. This will result in an increase in the number of orders and a wider scope of cooperation with SIMEC,” stated the client.
The hydraulic oil press is wrapped in plastic film and fixed inside a steel case for safe transportation.
New South Wales holds a vital role in Australia as the country’s most developed agricultural and industrial state. Its unique mineral resources and strategic position have provided a solid foundation for industry and urbanization. Meanwhile, the natural landscape and mild climate give adequate circumstances for agriculture and animal husbandry development.
On this fertile land, one of our esteemed clients continues his family’s centuries-long farming and other connected industries. The main orchard crops farmed here are avocado and macadamia nuts, but other fruits and vegetables such as Davidson Plum and honey are also produced. AVOCADO fruit production in the orchards are grown and processed specifically to cater for the ever increasing Australian Cosmetic and Pharmaceutical industries. MACADAMIA nut & HONEY production in the orchards are processed locally and marketed nationally as well as around the world. Oil is also produced from the macadamia nuts for both the cosmetic and food industries.
The farm’s requirements and regulations for the fruits and vegetables it provides are stringent, especially since the avocado orchard just applied for ACO “Organic Certification”. In order to diversify, the client chose to investigate avocado oil extraction and vegetable freeze-drying. In order to maintain high standards, he eventually selected SIMEC as the supplier of avocado oil production technology and machinery. He intends to continue his family’s solid business reputation by producing high-quality avocado oil product.
In May 2023, we finally delivered one set of HOP50/280 hydraulic oil press and one set of oil purification apparatus. The equipment is all in compliance with local electrical specifications and safety regulations. Unfortunately, due to the farm’s limited power and gas supply, a malaxing machine cannot be used on-site. However, the client states that after he overcomes the infrastructural limitations, he will consider purchasing SIMEC avocado malaxing machine in the future.
SIMEC hydraulic oil press machine adopts cold processing technology to extract sunflower seed oil at low temperature. Nutrients are retained to the maximum.
Sunflower seeds are the fruit of sunflowers. Its seed kernels contain 30%-45% fat, and up to 60%. Sunflower oil is golden in color, clear and transparent, and has an aromatic smell, which is an important edible oil. It contains a large amount of linoleic acid and other essential unsaturated fatty acids, which can promote the regeneration and growth of human cells, protect skin health, and reduce cholesterol stasis in the blood, and is a high-grade nutritional oil.
At present, the main players in China’s avocado market include Peru, Mexico and Chile, while China’s domestic production is also increasing year by year. Kenya’s fresh avocados gained long-awaited market access to China in June 2022, and Tanzania, another major African avocado producer, gained market access to China in November 2022.
Kenya has ideal climatic conditions for growing avocados, and the country’s low humidity and mild climate ensure stable yields and desirable flavors. Kenya produces more than 40 species of avocados, the main three varieties being Hass, Fuerte and Jumbo, and the main varieties exported and gaining market access to China are Haas.
Kenyan avocado exports continued from mid-March to mid-November. On August 2, 2022, the first batch of Kenyan fresh avocados departed for China, and Kenya was the first African country to export fresh avocados to China. In 2022, Kenya exported more than US$ 57 million worth of “green gold” to China.
The Avocado Society of Kenya believes that China is the world’s most potential avocado demander, and it is expected that China’s avocado imports and domestic production will increase in the next few years. ASOK has made it a priority to produce more avocados to increase the supply of exports to China. Shipments will begin at the beginning of the 2023 harvest season, i.e. from March, and exports are expected to more than double in the 2023 season.
However, not all avocados meet the quality requirements for export to China. The reason for non-compliance may be due to color, size, shape and so on. They cannot be sold directly as fruit, but they still contains nutrients and oil. To develop the value of such non-compliance avocados, a wisdom Chinese entrepreneur decided to invest in the production of avocado oil, adopting SIMEC cold pressing technology. SIMEC avocado oil press machine is easy to operate and run in automatic mode. The business development strategy is to lease machines to avocado farmers and train them to operate the machines. This will help to provide a large number of jobs to the local people and increase their income. The avocado oil can be exported to China and Europe. SIMEC avocado oil press can produce extra virgin avocado oil which can be sold as cosmetics raw material and edible oil.
On 14th December 2022, Avocado Pulping Machine, Avocado Oil Press and Oil Purification Apparatus were delivered to Qingdao port and loaded on the ship to Kenya. Before delivery, all the machines have passed PVoC inspection. PVoC is the short of Product Verification of Conformity.
This video presents avocado oil extraction process by using SIMEC avocado malaxer and HOP50/280 hydraulic oil press.
To improve oil extraction efficiency, a malaxing process is important to condition the avocado paste. HOP50/280 hydraulic oil press adopts cold processing technology to make virgin & pure avocado oil. There’s no heating or temperature rise during oil extraction process. It provides 380 tons vertical force to ensure the oil extraction rate.
On April 25, 2022, a set of HOP40/250 hydraulic cocoa butter press machine was shipped to Pasir Gudang Port, Malaysia. This client is large and award-winning cocoa product manufacturer in the world. SIMEC cocoa butter press was initially purchased by the same client in 2017. It’s still working well so far. However, the client purchased new machine again this year to expand the production of extra-virgin cocoa butter.
Cocoa butter is very important ingredient for single origin chocolate, as it forms the continuous phase of chocolate. It is responsible for the gloss, texture, and typical melting behavior of chocolate.
Cocoa butter is also one of the most popular ingredients in cosmetics. The fatty acids in its composition makes it ideal for soothing dry skin on your hands, feet, elbows, and knees. Cocoa butter itself is a great lip balm.
The coco butter is pressed from the cocoa mass/liquor. Before cocoa liquor pressing, there’re a few steps of pretreatment process which is cocoa bean fermentation, crushing and milling. Good liquor preparation helps to achieve a high pressing result of cocoa butter extraction. SIMEC colloid mill is the key equipment to make high quality cocoa mass/liquor. The cocoa mass/liquor is then pressed into cocoa butter and cocoa cake by SIMEC hydraulic oil press. The melting point of the pure prime pressed cocoa butte ranges from 34℃ to 38 ℃, it melts at body temperature.
Cocoa Liquor
Cocoa Butter
Cocoa liquor itself consists of two components; cocoa butter and cocoa powder. In a cocoa press the ‘solids’ (cocoa powder) and the ‘liquids’ (cocoa butter) are separated by pushing the liquor down against cloth bags in a perforated stainless steel chamber. The cloth bag is designed to let the butter pass through but to keep the ‘solids’ inside the chamber. Separating the cocoa butter from the solids requires an large amount force, about 380 tons provided by SIMEC cocoa butter press machine, then the ‘solids’ come out as hard as a brick, which is referred to as ‘cocoa cake’ and is later grinded into cocoa powder.
The advantage of hydraulic pressing is that it creates no sheer forces on the product and allows for exact control of the volume of cocoa butter pressed out ensuring optimum product quality. As a complete solution for efficient cocoa butter pressing, SIMEC cocoa butter press machine is designed and manufactured to meet the latest global industry requirements. It comes with two pieces of perforated barrels in which the cocoa liquor is pressed into cocoa butter and cocoa cake.
The barrels and all the other cocoa liquor and butter contact parts are made of high quality food grade stainless steel. Patented perforated material barrel is precisely processed by CNC machining, reaching to mirror effect through polishing.
In the cocoa butter presses, the butter is separated from the cake. Butter runs out through holes in the barrels, then drips through the dripping trays into a central butter channel and is collected in the butter vessel.
The properties of the cocoa liquor will influence the behavior of the cocoa butter press, so the pressing cycles are adjustable and flexible. The control system will continuously adjust the power supplied to the main hydraulic ram to optimize pressing performance to the liquor. Robust design, easy setting and operation.
The cocoa butter press machine was packed in a steel case and shipped to Malaysia by sea.
In mid-May 2022, SIMEC shipped a unit of Extra-Virgin Cold-pressed Avocado Oil production line to one of our Australian clients, who owns a family-operating organic avocado orchard in Southwest region.
The organic avocado fruits in the orchard are classified into several grades, such as 2nd grade and other higher levels. Commonly, the 2nd grade avocado fruits are referred to as unqualified commodity fruits, and its price is much lower than the market approved fruits. Compared with high-grade fruits, this low-grade fruit defined in the commodity market has only a slightly different appearance, but no difference in internal quality and oil content. Thereby, the client decided to use SIMEC cold-pressed technology and equipment to produce extra-virgin edible avocado oil that is thought to be a niche market to grow locally.
2nd Grade Avocado Fruits
Extra Virgin Avocado Oil
SIMEC has vast expertise and rich experience in innovative technology of producing extra-virgin avocado oil. We furnish our clients with a cold-pressed avocado oil production line that consists of Avocado Pasting Machine, Hydraulic Oil Press and Avocado Oil Purification Apparatus. The avocado pasting machine integrates peeling, destoning and pulping.
It is suggested to have the avocado flesh pulp gone through malaxing before oil pressing, aiming to enhance oil yield. 380 tons of vertical pressing force endows the SIMEC HOP50/280 hydraulic press with outstanding pressing efficiency. The residual oil rate in the oil cake can be controlled in a very low range. SIMEC HOP oil press is developed for absolute cold-pressing, there is no temperature rising during pressing. The oil press comes with two material barrels as standard. The barrels and other parts in contact with the paste and avocado oil are made of high-quality food-grade stainless steel.
The last but not the least, the crude avocado oil from hydraulic oil press will be purified by SIMEC patented Avocado Oil Purification Apparatus. The apparatus adopts ingenious physical purification design to ensure the consistent quality of extra virgin avocado oil.
In this plant, all parts in contact with raw materials and oil are made of food grade stainless steel. SIMEC team has installed and debugged the avocado oil production line before delivery. We will handover a ready-to-produce plant to our client. All electric motors and elements were customized, catering to the accessible single-phase electricity with 240 Volts and 50 Hertz.
The plant will be shipped to Fremantle sea port on May 22, 2022. The client can produce the extra-virgin cold-pressed avocado oil in the coming harvest season of avocado fruits. The packing photos and parameters are as follows:
SIMEC focus on the technology and equipment to produce guacamole and cold-pressed avocado oil.
The avocado fruit is widely regarded as an important fruit for its nutritional values, as it is rich in vital nutrients for the human body. There has recently been an increasing demand in antioxidants, given their beneficial effects on human health. In this respect, avocados contain three of the most important ones, which are vitamins. Avocado fat consists predominantly of mono-unsaturated oleic acid, which has been found to reduce harmful low-density lipoprotein cholesterol, while maintaining beneficial high-density lipoprotein cholesterol, and to perform better than typical low-fat diets.
Although avocado is primarily consumed fresh, a substantial increase in the use of avocado-based products (e.g., guacamole) and oil for cosmetics and culinary purposes also suggest further market growth. In general, an avocado fruit is roughly pear-shaped and more or less elongated. Its weight may range from 60 g to 700 g. The relative amount of pulp varies from 60 to 75% according to the cultivar. The oil content may also vary widely. The main quantity of oil is in the pulp/flesh of the avocado fruit.
Average composition of a Hass avocado
Hass avocado has large amount of flesh with a high oil content. Depending on the location of the orchard, the oil content of Hass variety fruit flesh can range from 16-17% in September to 25-30% in April depending on the fruit ripening stage. The kernel/stone contains only about 1% of oil, whereas the skin accounts for less than 4%.
The characteristics of avocado fruits can change depending on multiple variables. Variety, ripeness stage, geographical area, fruit humidity are some of main factors that affect extraction rates and the final quality of avocado oil.
As a leading technology developer, SIMEC leverages its significant experience and technological expertise to develop a novel extraction method to obtain high-quality avocado edible oil, so called cold-pressed extra-virgin avocado oil (CPAO in short) which is not refined and maintains the chemical, organoleptic and flavour profile of the fruit flesh.
For small scale avocado oil production, avocado oil extraction is generally obtained by peeling and destoning the fruit, mashing the pulp, then malaxing the paste, and pressing the oil. The corresponding equipment required include avocado peeling and destoning machine, pulping machine, malaxer, hydraulic avocado oil press, oil purification apparatus. SIMEC offer all the equipment and complete technology.
For large scale processing plant, centrifuge separation technology is recommended to extract avocado oil in a continuous and efficient mode.
Step One: Fruit washing, destoning, peeling and mash preparation
Avocado fruit washing is performed by immersion and jet showering in order to remove dust from the surface of the fruits. Then a multi-channel avocado pasting machine will separate nut and peel from the pulp, then make the pulp into mash form. The nuts are 100% separated.
Skin separation needs to be calibrated according to the desidered quality, since the proportion of skin into the processed mash may affect the pigment composition of avocado oil. Pigments are important for the intensity of the green colour, its stability and its healthy effects.
Step Two: Avocado mash conditioning and malaxing
The avocado pulp mash with a variable proportion of peel is pumped into a colloid mill for further conditioning. Avocado oil comes in a finely dispersed emulsion inside the cells of the fruit pulp, so the extraction process requires rupturing not only the cell walls, but also the structure of the emulsion.
Colloid mill has the important effect of chopping cutting very finely the peel for maximum pigment extraction, and cuts the filaments remained in the paste and, at the same time, to minimize the emulsion. The avocado paste can be circulated through return pipes and re-grinded easily to achieve the desired emulsion fineness. Qualified pulp mash is temporarily stored and conditioned in the agitating tank.
The conditioning process provides the possibility to heat the mash before malaxing with the positive effect of increasing volatile compounds and reducing malaxing time up to 50%.
After conditioning, the avocado mash is pumped into malaxing section equipped with multi sets of malaxers (kneading machines). Each malaxing machine consists of a stainless steel tank with a central screw ribbon stirring the mash slowly and continuously at a monitored temperature.
Small oil drops are released during fruit milling, then during malaxing merge into large drops (coalescence phenomena) that can be easily separated by centrifugal extraction.
On average we should consider as optimal a malaxer temperature lower than 50°C and a malaxing time between 30 and 45 min. 10%-20% of hot water is added during malaxing/kneading process. The addition of water processing aids (e.g., enzymes and talcum powder) is acceptable, but no chemical solvents can be used.
Step Three: Oil extraction
The separation of oil from solid and liquid phases is done using a decanter centrifuge that exploits the centripetal acceleration to separate continuously a mixture of particulate solids and liquids with phases having different densities. The avocado pulp mash is separated into oil, vegetation water and solids (exhausted pulp and residual skin).
The oil phase and the water phase are collected separately under the decanter centrifuge. The oil phase is pumped out to a vertical purifier centrifuge, while the water phase is pumped out to a vertical concentrator centrifuge.
Step Four: Oil purification and recovery
The avocado oil flowing from the decanter centrifuge still has a certain amount of water and solids. Vegetation water from the decanter should still contain a small quantity of residual oil. Both liquid phases are sent to vertical centrifuges. A disk stack centrifuge is for final oil purification to remove residual water and solids. A second disk stack centrifuge is used to recover residual oil from the vegetation water flowing from the decanter.
Extra virgin avocado oil extraction should be carried out using only mechanical methods including hydraulic oil press, and decanter centrifuge at low temperatures (<50°C). The cold-pressed extraction method can yield an oil with significantly higher pigment levels, a stronger flavour and, consequentely higher health benefits.
The chemical composition and organoleptic profile of cold-pressed extra virgin avocado oil are reported in the table below.
Parameter
Description/value
Odour and taste
The characteristic avocado flavour and sensory assessment shows at least moderate (above 40 on a 100-point scale) levels of grassy and mushroomy/buttery hints with some smoky notes. The Hass cultivar gives an avocado oil with grassy and buttery/mushroom-like flavours. Fuerte cultivar that has a more mushroomy flavour and fewer typical avocado flavours.
Colour
Nice and intense green
Stability
2 years at room temperature when stored under nitrogen and in the dark
Ripened avocado fruits are premium for the extraction of extra virgin avocado oil. A peeling & pitting machine will remove peel and pit from avocado fruit, then make the pulp to be paste form.
To improve oil extraction efficiency, a malaxing process is important to condition the avocado paste. Extra virgin avocado oil is smooth and presents emerald green. So a low temperature malaxing process with minimal time is required to reduce oxidation of avocado pulp paste. The malaxer should be constantly monitored for temperature.
SIMEC technology can process many varieties of avocados, such as Criollos, Choquette, Carla, Popenoe, Semil 34, Benny, Hass, Fuerte, Pinkerton and Reed. With regard to the temperature in the malaxer, it should be less than 45℃ taking into account the possibility to add the use of an enzyme process to increase oil yield.
We produce both large scale malaxing system and small scale malaxer.
In the 2nd week of March 2022, a malaxing machine is ready for shipment to Uganda. This client has started avocado oil production since 2021, using HOP50/280 avocado oil press, avocado pasting machine and oil purification apparatus. To optimize processing technique, he decided to order advanced avocado malaxing machine to replace of manual malaxing. Predictably, both the efficiency and yield of his avocado oil mill will be improved.
The malaxing machine uses thermal oil to heat the pan body, which is evenly and stably heated and has high energy efficiency. The malaxing temperature and stirring speed can be set to meet the requirements of different productions. It’s designed to run in full automatic mode. Since it’s a roasting malaxing process, beside avocado paste malaxing, the machine can also roast oil seeds. It is convenient to use, reliable in action and strong in comprehensive ability.
Packing details of SIMEC avocado malaxer and spare parts are included in the table below.
SIMEC household screw oil press can continuously squeeze a variety of raw materials, with fast speed, good oil quality and good taste, and the oil output rate is as high as 98%. After feeding, the oil will be squeezed automatically, without material jam or blockage, and the oil can be delivered smoothly, without the need for special personnel to supervise the whole process. The oil press has the characteristics of simple operation, high processing efficiency, and full automation.
The whole oil press machine is made of food-grade stainless steel, in which the pressing cavity is made of 316 material, and the pressing screw is made of 304 material. The machine adopts a side oil outlet design, which can directly fill oil into a container, which is convenient and quick. The large size feed port ensures smooth feed.
SIMEC has designed a variety of press screws for different raw materials to achieve the highest oil extraction rate. Use high-quality motor and reducer to extend the service life. The pressing temperature can be adjusted freely from 0 to 400 degrees Celsius to adapt to more raw materials.
SIMEC home use screw oil press is movable, equipped with lockable swivel casters. The machine can run 24 hours continuously.
Technical Parameters:
Type
SOP3061
Motor Power
1500 W
Electric Heating Power
380 W
Power Supply
220 Volts, 50 Hz.
Net Weight
23 KG
Overall Dimensions
480*300*490 MM
Demo of peanut, flaxseed, rapeseed, black sesame and tea seed oil pressing:
Capacity parameters for processing different raw materials:
Raw Material
Process Capacity per Hour
Oil Yield per Hour
Peanut
7.5 kg
3 kg
Rapeseed
10 kg
3.75 kg
Tea Seed
5 kg
1.85 kg
Sesame
10 kg
4.5 kg
Sunflower Seed
7.5 kg
3.5 kg
Flaxseed
5 kg
1.75 kg
Walnut
5 kg
2.25 kg
Soybean
10 kg
1.25 kg
How to Install, Disassemble and Clean the Screw Oil Press?
SIMEC household screw oil press machine is delivered with the following additional spare parts: stainless steel pot, power cable, filter, stainless steel cleaning brush, gloves, pressing screws 3 sets.
