Using a screw press for oil, you can get vegetable oil from various cultures without any problems. Depending on what you have to work with, the specifications and design of the device change. However, in any case, it is quite simple, and therefore it can be done with your own hands.
Instrument Features
If a screw press is available, regardless of whether it is made with your own hands or purchased, it will be a good helper for obtaining vegetable oil on your own. The features of the unit allow you to get the following benefits:
- When receiving oil at home, its shelf life will be about two years.
- If a screw press is used to squeeze household type oil, it is possible to successfully process the seeds of plants such as sunflower, olives or nuts.
Structural elements of equipment
If you want to make a home press for squeezing oil, then its basis should be a worm-type screw. When assembling and designing this equipment, it is very important to remember that the maximum pressure will directly depend on what diameter the worm nut is selected, as well as on what capacity the beam struts have. In order to make the design more reliable during operation, it is worth making the main emphasis for the press more powerful than required. For example, the screw press for spinning, which is created from solid oak wood, fully complies with these important requirements. However, it will cost quite a lot. An analogue can be the same design, but only made of metal.
There are also cylindrical household presses, which usually have no bottom. This role is usually played by an ordinary iron bucket. To increase the reliability and strength of the cylinder itself, you can tie it with a metal strip from the bottom. If the cylinder is made of wood, then it must be dry and made of the most solid wood. As in the previous case, the best option is oak wood.
One of the most important structural elements that should be present in any model is peeling rollers. Usually they are presented as a pair of interchangeable rollers. The rotation of these parts is ensured by the placement of gears on metal racks.
The principle of operation of the device
The essence of the screw press is as follows.
- He has a loading bucket where raw materials for processing are filled up.
- Using the handle, the rollers covered with a grater are driven.
- Due to the rotation of these devices, the raw material is drawn into the space available between them. So peeling takes place.
- After the cleaning process, both the husk and the sunflower seeds fall into the lower bucket.
- This mixture is sieved.
- It is necessary to replace rolls with a grater cloth, on rolls with a completely smooth surface. It is with their help that the spin will take place.
- The peeled seeds are again poured into the upper bucket.
- The devices have a lever that adjusts the gap between the rollers. At this stage, it must be moved to the second position to reduce the gap between the elements to achieve the desired result.
- After rolling, a porridge mass will be obtained, which must be compressed so that vegetable oil is obtained from it.
Oil extraction methods
Liquid extraction using a screw press can take place hot and cold. If the first method is used, then after rolling it is necessary to move the porridge into the roasting pan. The temperature here should reach 110 degrees Celsius, and the product must be constantly moistened. In addition, the mass must be constantly mixed. After this stage of preparation, the raw material is transferred to the screw press, where the necessary operation takes place. The oil obtained in this way is distinguished by a bright red color, as well as a strongly pronounced smell of fried seeds.
The use of the second method is more preferable, since there is no need for thermal exposure, due to which many useful substances evaporate. In practice, the technology for producing oil is exactly the same as in the hot method, except for the stage where the pulp is heated to high temperatures.
Production equipment
Today, vegetable oil production lines can be described in the following steps. Firstly, it is necessary to dry the product, remove all impurities and contaminants. Secondly, there is a special compartment where the seeds are separated from the husk and crushed. The crushed raw materials are steamed. If you plan a hot method of obtaining oil, then you also need to fry. After this, the process of squeezing the oil from the seeds. It is also important to add that the oil that has just been obtained immediately goes through the filtration step, which greatly increases its purity. The last stage in the production line is filling in plastic containers and sending them for storage.