In recent years, the most popular processing method of edible sunflower oil is mechanical oil pressing and cold pressing. Many customers are always wondering if the sunflower seed should be shelled before oil extraction. Actually, this is decided by the request of customers.
Make Sunflower Oil without Shelling
For a small-scale sunflower oil production line with a capacity of less than 20T/D, the seeds can be expelled in an oil press with shells. This process is very common in small-scale oil extraction workshops or family oil milling businesses. Surely, the shelling process can be included for small-scale production line if the customer request.
Make Sunflower Oil after Shelling
For an industrial-scale edible oil mill plant with a daily capacity of more than 20 tons, a sunflower seed dehulling machine is necessary. The main process of a full-scale sunflower oil processing plant is shelling, pre-pressing, solvent extraction, oil refining, and oil filling. (Extract oil after dehulling can reduce the wax content of the final oil.)

There are four types of sunflower oil, all of which are made from sunflower seeds that are bred to produce different fatty acid compositions.
These include high linoleic (68% linoleic acid), mid-oleic (NuSun, 65% oleic acid), high oleic (82% oleic acid), and high stearic/high oleic (Nutrisun, 72% oleic acid, 18% stearic acid) (1).
As their names suggest, some sunflower oils are higher in either linoleic or oleic acid.
Linoleic acid, commonly known as omega-6, is a polyunsaturated fatty acid that has two double bonds in its carbon chain. Meanwhile, oleic acid, or omega-9, is a monounsaturated fatty acid with one double bond. These properties make them liquid at room temperature.
Linoleic and oleic acid are both sources of energy for the body and contribute to cell and tissue strength.
However, they react in different ways to heat during cooking and therefore may have varying effects on your health.
High stearic/high oleic sunflower oil (Nutrisun) also contains stearic acid, a saturated fatty acid that’s solid at room temperature and has different culinary applications.
This type of sunflower oil is not meant for home cooking and instead may be used in packaged foods, ice creams, chocolate, and industrial frying.

NUTRITION FACTS FOR DIFFERENT SUNFLOWER OILS
All sunflower oils are 100% fat and contain vitamin E, a fat-soluble nutrient that protects cells from age-related damage.
Sunflower oils do not contain protein, carbs, cholesterol, or sodium.

#sunfoweroilexpeller

1. Cleaning Groundnut-shelling, picking out bad and germinated ones
Before making oil from groundnut, the germination and bad ones should be picked out, and it is better to remove the shell too.
The groundnut shells can be manually peeled off, but this is time-consuming. But now the peanut shells are mostly removed by the groundnut shelling machine in the oil mill, which takes a short time.
The shelled groundnut will be screened, which can sieve out fine groundnut kernel granular. And then germinated and spoiled groundnuts are hand-picked.
2. Roasting groundnuts
Then feed the groundnuts into the roasting machine. The primary purpose is to get rid of the excess moisture of the groundnut kernels. The degree of roasting is different here, and the color of the pressed groundnut oil is also very different. If it is burnt, it will not be able to squeeze out the oil, so it is essential to control the temperature.
3. Extracting groundnut oil by the oil press
Preheat the oil press. After the oil press is preheated, pour the roasted peanuts into the feed hopper of the oil press while it is still hot. Turn on the switch to extract oil. Generally, it needs to be squeezed two or three times, all of which are processed automatically by the machine, as long as it is set in advance.

After the oil is squeezed, it will flow through the oil outlet. There is a filter cartridge at the oil outlet to filter the oil because the oil just squeezed out contains fine oil residue. After filtering out the oil residue, the peanut oil is purer.
4. Groundnut oil cooling
After filtration, the oil will be cloudy, so it needs to be poured into a container for settling. In addition, the temperature of the oil that has just come out is relatively high, and it needs to cool for a while.
After the oil is cool, it can be put into the oil pot, and the oil extraction is complete.

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First, check the oil extractor machine if there is something that entered the machine during transportation.
Second, add oil to each oiling component. This requires a frequent inspection to prevent early wear of machine parts.
Third, before oil extraction, every day, turn on the machine for a few minutes and try to adjust the thickness of the cake to be thicker to prevent the shaft from being stuck.
Fourth, the oil press should start feeding slowly at the beginning of the operation. After the cake is released, gradually add more material. After the temperature rises to the normal pressing temperature, start filling the chamber and adjusting the thickness of the cake to a normal thickness.
Fifth, all the materials need to be drained before the shutdown, otherwise, the spindle is easy to lock and cannot be started. It can be idling for a few minutes after stopping, and the thickness of the adjusting screw can be rotated several times repeatedly to spit out the material.

The oil expeller is a mechanical device for pressing oil crops, the types of pressing can be divided into two types: hot pressing and cold pressing. What are the differences, advantages, and disadvantages between them?
Cold Pressing of Oil Expeller
As the name suggests, it means that after cleaning, the oil seeds are not heated, and are directly put into the oil press for pressing. This kind of pressing method is challenging to squeeze oil out at once, and the oil cake produced also has an oil content. Some require this type of oil cake.
The advantage of cold pressing is that the oil color is lighter, there will be no foaming when the oil is pressed, there will be no phenomenon of stagnation, and the color is better.
The disadvantage is that the taste of the oil is not very fragrant, and it takes more than two times to squeeze the oil clean.
Hot Pressing of Oil Expeller
Hot pressing is just the opposite of cold pressing. The oil seeds are pressed after heating. This pressing method can extract oil from oil seeds clean at one time, and the oil cake produced has almost no oil content, so the oil cake is completely deoiled. , which can be used when making oil-free cakes.
The advantage of hot pressing is that the pressed oil is very mellow, and the heated oil is more oily than cold pressing, but because it is hot pressing, sometimes there will be a phenomenon of stagnation. It should be noted that when pressing, don’t be too anxious to feed the material and feed the material in an appropriate amount according to the oil output of the pressing.

Anyone who has used an oil press machine knows that oil press machine also has low and peak seasons. During the peak season, the oil presser are used for a long time and the frequency is relatively high. At this time, the wear and tear of the oil press is relatively serious. In order to prolong the service life of the oil press, maintenance work needs to be done in the off-season.

1. Details determine success or failure
For some gaps in the oil press, it is necessary to check in detail, especially the gap between the screw shaft and the cake ring. It is necessary to ensure that the distance is within the normal range. When there is debris in the middle, it needs to be cleaned up in time to prevent the occurrence of stuck. At the same time, check the tightness of bolts and nuts to prevent loosening due to vibration during use.

2. Pay attention to waterproof

The oil press is rarely used in the off-season. When placing it, it must be kept away from the water source to prevent the oil press from oxidizing and rusting. Before storage, in order to prevent decay and deterioration, the excess grease inside the oil press must be cleaned to prevent the remaining impurities from causing corrosion to the oil press. Apply lubricating oil to some bearing parts to prevent rust.

3. Regular inspection

Although it is said that the oil press is rarely used in the off-season, in order to ensure its performance, it is necessary to restart the oil press equipment regularly, which can effectively prevent some parts from rusting and affect the flexibility of the oil press. The circuit needs to be overhauled to prevent the cables from being bitten by mice during storage.

I. The Serious Harm of High Temperature to the Screw Oil Press

The temperature is originally an essential factor for the oil press to improve the oil output during the pressing process.

However, the high outdoor temperature in summer and the heat generated by the friction between the oil seeds and the equipment during the pressing process make the oil press easy to reach the temperature limit in a short time.

After running for a certain period of time, the casing of the machine will be very hot, not to mention the temperature of the internal screw. If the temperature is too high, it will not only destroy the oil nutrition but also soften the internal structure of the equipment.

If the key components such as the screw press are subjected to high temperature and the extrusion of hard oil seeds, it is easy to cause damage and deformation of the components. Excessive use at high temperatures for a long time is very likely to completely scrap the oil press machine. We should be aware of the serious harm of high temperatures to equipment.

II. How to Use the Oil Press Correctly in the High-temperature Season?

1. The easiest and most effective way is, of course, to lower the temperature of the equipment.

The equipment is placed in a cool and ventilated place during work, and the indoor temperature can be controlled if conditions permit, so that the oil press can work for a long time in high-temperature seasons.

2. In the high-temperature season, the equipment also needs to rest.

According to the quality of the oil press, the working time of the equipment is set to prevent the equipment from being damaged by high temperatures due to long-term work.

3. The oil residue will seriously corrode the equipment, and under the high temperature, the equipment will become soft, so the machine needs to be cleaned in time.

However, it should not be disassembled and cleaned immediately after the work is completed. It should be placed for a period of time and the equipment can be disassembled and washed after it has cooled down.

4. Lubricant should be smeared before the equipment works in summer.

After running for a period of time, stop and rest and apply again. The high temperature will increase the friction between the gears, increase the wear and cause damage.

III. Conclusion

As long as paying attention to the above points when operating the oil press equipment, it can effectively prevent the equipment from being damaged due to excessive temperature.

6YL-165 SCREW PRESSING PRESSER
Voltage: 380V
Dimension(L*W*H): 2500X700X770mm
Weight: 1180kgs
Max Capacity: 800 kg/h
Application: Edible Oil Production
Material: Carbon Steel
Oil type: For producing Flax Seed Oil, Soybean Oil, Rap seed oil, Tea Seed Oil, Basil oil, SESAME oil, etc.

1. Hydraulic oil press
The hydraulic oil press is a small oil press, and the production process is intermittent. The process is characterized by low operating technical requirements, high oil yield, and good crude oil quality, but with high labor intensity.
The applicable occasions of the hydraulic oil press are small processing capacity, small workshop production, and the processing capacity of a single unit ranges from 8kg/hr to 200kg/hr.

2. Screw oil press
The fully automatic screw oil press is an oil press that can operate continuously. The technical features are low operating technical requirements, high oil yield, lower crude oil quality than hydraulic oil press, and lower labor intensity than hydraulic oil press.
The applicable occasions of the automatic screw oil press are small processing volume, small workshop production, and the processing volume of a single machine ranges from 50kg/hr to 800kg/hr.
3. Large and medium-sized screw oil press units
The screw press unit is suitable for large and medium-sized, continuous and large-capacity oil plants. The technical features are continuous production, low labor intensity and high oil yield.

If you want to do a small oil processing plant, you can use a small oil press production line, so that the production efficiency and degree of automation will be higher. However, if it is a self-employed workshop, the output is generally not high, and a smaller automatic oil press can be selected.

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