An expeller press is a screw-type machine that presses oil seeds through a caged barrel-like cavity. Raw materials enter one side of the press and waste products exit the other side. The machine uses friction and continuous pressure from the screw drives to move and compress the seed material. The oil seeps through small openings that do not allow seed fiber solids to pass through. Afterward, the pressed seeds are formed into a hardened cake, which is removed from the machine.

This screw oil press is an advanced expeller which is widely used in pressing oil from vegetable oil seeds, such as soybean, peanut, sunflower seeds, jojoba seeds,cotton seeds, sesame, tea seeds, copra, jatropha seeds, castor seed, etc. And the product oil is for both edible and biodiesel fuel purpose. This oil press has the advantage of high efficiency, low consumption, simple operating, stable function,easy maintenance, high productivity and high oil output.

With 10 years' manufacturing and exporting experience, we have built long term relationships with many specialized equipment manufacturers and obtained perfect and steady supply network for supplying  advanced quality oil mill machinery as well complete set of seed oil extraction plant. So far we have exported complete oil mill plant, oil extraction plant,oil refining plant and general oil processing machinery to over 50 countries and regions, such as Zambia, India, Russia, Kazakstan, Australia, Nigeria, Mexico, Korea etc.

Oil press parameter

Groundnut Oil Extraction Process

Producing groundnut oil, using a mechanical method involves a range of technical activities. It follows a process that involves three main stages, namely;

• Seeds Preparation
• Pressing
• Refining

Seed Preparation

This is a very manual process that simply involves selecting the good groundnut seeds from the bad ones. Also, cleaning is done here to take away all dust components like sand, plant debris, stalk, and tiny rock particles. Breaking the seeds into smaller pieces so they can be easily milled is also done here. Furthermore, the moisture content is controlled through a conditioning process before they are heated up and made ready for the next stage.

Groundnut Pressing

This is the second phase and it is the production stage. The presser, usually a screw pressing machine, is loaded with the selected groundnut seeds. The screw of the machine warm presses the ground as they are driven further into the narrow part of the chamber. This constant pressure and rising temperature then force oil out of the groundnut. As the temperature rises, output increases. The oil squeezed out of the groundnut is then released through small holes made under the chamber. There you have your fresh, but crude groundnut oil.

Oil Refining

This is the final process. Here, the fresh groundnut oil obtained from the presser is pumped through a filter to purify it. After filtering is done, the groundnut oil will then be taken to a refining machine for another three stages of refining. These are neutralization, bleaching, and deodorization.

However, for the sake of this post, we’re focusing only on extraction and the prices of machines you can use for the process. As I mentioned earlier, there are different types of groundnut oil extraction machines with different capacities and for different prices. Some are for large-scale industrial production. Others are for small-scale production.

Main Oilseeds Produced in Zambia

In Zambia, agriculture is a very important sector in its national economy and more than 80% of its population is engaged in. It has fertile land and mild climate, so Zambia has achieved self-sufficient in agriculture. The main crops in Zambia has corn, wheat, soybean, groundnuts, cotton, tobacco and so one, among which corn gern, soybean, groundnuts, cottonseeds are all great raw materials to make cooking oil.