There is generally not much investment for seeds storage in small groundnut oil plant. But for large scale groundnut processing factory, to avoid moldy, heat preservation warehouse with mechanical ventilation equipment is suggested.Cleaning
The groundnuts entering the oil plant inevitably carry some impurities such as stems, leaves, soil, grass seeds, etc. These impurities can not only affect the quality of oil and oil cake, but also will absorb part of the oil and reduce the oil yield of peanut oil making machine. Moreover, if there is sand, stone, metal, hemp rope or so in the groundnuts, it will cause wear and tear of the parts of the peanut oil expeller, even lead to production accident. Therefore, in order to ensure the smooth production of groundnut oil, impurities must be removed as far as possible. There are many methods of cleaning, which can be used according to the situation of impurities.
If the groundnuts have high moisture content, drying is necessary for the convenience of shelling process.
The next step of groundnut oil extraction is to remove the shell. The shelling process can be done manually by labor, or by use of peanut sheller to reduce the manpower and shorten production time. The purpose of shelling before oil pressing is to reduce the absorption of oil by the shell, increase the oil yield, improve the processing capacity of groundnut oil processing machine and reduce the equipment wear and tear. It can also improve the quality and added value of oil cake.
Cooking is one of the most important steps in groundnut oil production process. Cooking is the Iconic process of hot pressing technology, while cold pressing means extraction oil without cooking.
Screw pressing is the most common used oil extraction technology for groundnuts. The production process of screw oil pressing keep the original flavor of groundnuts. The produced groundnut oil is a kind of pure natural green food, featured of mellow fragrance, rich in nutrition ingredient, long shelf life, and without any additives, solvent residue and soap content. Also, the value of peanut cake is also high. The peanut shell or oil cake is great raw materials for poultry feed mill plant and cattle feed mill plant.
Advantage of Peanut Oil Mill
(1) High oil yield , obvious economic benefit.
(2) Residual oil rate in the dry meal is low.
(3) Improving the quality of the meal and oil.
(4) Low processing cost , high labor productivity.
(5) High automatic and labor saving.