An oil expeller is normally a mechanical machine that presses the seeds under pressure to extract oil. In present days oil expellers are being used worldwide. Conventional oil expellers are found these are less efficient but take large amount of electricity. Even these are used at homes for domestic purposes. These expellers are known as domestic expellers they extract oil from the seed itself.

Kitchen model expellers

Oil that is obtained after extraction is fresh and pure and does not include any kind of chemicals. After the oil extraction process is performed the seeds left a residue that later does not get wasted. It is used as a by-product to feed the animals. These can also be known as kitchen model oil expellers they are made of steel. This aids them in crushing every kind of seed whether they are edible or non-edible such as sesame, groundnut, mustard, sunflower and almond so on.

 Special advantages of these oil expellers–

• It is easy to operate as they provide automatic facilities.
• These machines can be established at large scale and have high oil yield.
• Extracted oil is healthy.
• It has low power of consuming energy and environment friendly.
• They are well designed, small in size and easy to place at homes.
• It is easy to clean and store.
• These are ideally made to use at homes.
• They produce less noise.

All the machines are designed well in order to fulfill the varying needs of the user’s especially dry oil seeds including cotton seeds. Machines present in Indian and international markets are three times more efficient than any other oil expeller. Bodies of all oil expeller are made of iron that provides durability and ease in extracting oil. All steel parts are gathered in the chamber of oil expeller to give better service.

Three vital steps need to be taken

Firstly, pre-pressing is done in which seeds are pressed and gives out the oil. In this method high capacity, low power is consumed; low wear and tear is required.     

Secondly, double pressing system should be followed when pressed cake has to be sold in the market. It depends whether two stage pressing can be carried out in the same screw press or sent to other screw press.

Thirdly, Special equipments need to be collected before starting the oil expelling process for all the seeds but mainly for cotton, groundnut and sunflower seed.

Processing of seed

Seed processing is another important aspect included in the oil extraction process. It is the step where seeds are cleaned so that the process works in a better way. Seeds already have some oil content in them thus it is necessary to remove it first. Along with this, sometimes they also contain many impurities that are to be taken away from them in an accurate way.