Sesame oil production line
   The oil content of sesame is between 40% and 58%. Sesame oil is extracted from sesame seeds and has a fragrance, so it is called sesame oil. Its protein content is also quite high, generally 23% to 26%.

      The machine-made sesame oil is often prepared by the "hot-frying-squeezing-precision filtration" method. The oil has a significant sesame oil fragrance, and its use is the same as that of small mill sesame oil. Because of the high oil content of sesame, sesame oil is prepared by leaching after pre-pressing with hydraulic press in industrial production. Since sesame crude oil contains about 1% of natural antioxidants such as sesamol, sesamol, and sesamin, sesame oil has a long shelf life.

Basic craft:

                  Sesame→screening→fried seeds→raising smoke→blowing→pressing→crude oil→precipitation filtration→sesame oil→  sesame cake→secondary pressing

Cleaning: The purpose of cleaning is to remove impurities and immature seeds;

Stir-fried seeds: When frying sesame seeds, it is important to master the heat, time and temperature. At the beginning, due to the high water content of sesame seeds, stir-fry the ingredients quickly; when the degree of frying reaches 70%, reduce the firepower, and check the ageing and tenderness of the sesame seeds at any time. Generally, the temperature should reach about 200℃. Ripe sesame seeds can be turned red or yellowish brown by hand. When frying the ingredients, stir frequently, so that moisture and smoke are easily emitted, prevent burnt, and avoid uneven cooking.

Raising smoke: When the sesame is out of the pot, although water is poured to cool it, the temperature is still around 140°C to 150°C. If it is not cooled, there is still a possibility of burnt, so the heat should be released immediately after being out of the pot. Hence the name "Yangyan". The smoke raising operation can be carried out by a smoke raising machine, and small oil plants often use manual smoke raising operations.

Blowing: In the process of frying, the sesame skins are easy to fall off, and there are some fried oil powder (commonly known as sesame bran) mixed in it. These substances contain less oil and mixing in sesame can also affect the quality of oil, so remove it. The blowing operation generally adopts the method of blowing or sieving.
Squeezing: The roasted sesame seeds are uniformly and continuously sent to the hydraulic press for squeezing, the crude oil is squeezed out under pressure, and the squeezed crude oil is filtered by an oil filter to remove solid impurities in it to obtain a clean crude oil.
Hydraulic press process: first spread a textile bag on the appliance, put in an appropriate amount of walnut kernels, pack the sesame seeds into small packets (5 kg per pack is appropriate), and put the wrapped sesame seeds in the mold (on the mold) There are many holes for oil flow. The mold must have a suitable thickness and can withstand a certain pressure), and each material layer must be separated by a thin iron sheet to facilitate the flow of oil between the material layers. Then pressurize, when the pressure rises to 4 MPa, the oil begins to flow; when the pressure rises to 10 MPa, there is little sesame oil that flows out, and the pressure can be discharged. The pressure should be raised less and frequently. The pressure should not be raised too high at one time, otherwise the oil will easily spray out in a slurry form or the oil flow channel between the oil materials will be closed and contracted, and the oil output rate will decrease instead.

Filtration/refining

  Refrigeration unit → crude oil → clear oil tank → plate filter → cooling pot → storage tank static settlement → plate and frame filter → bag filter → first grade sesame oil

Process Description

      The filter oil adopts low-temperature filtration, and the temperature is reduced to 15~20℃, which minimizes the volatilization loss of fragrance. The process of filtering, standing and filtering is adopted to fully filter out the phospholipids that are not easily hydrophilic, so that the content of phospholipids in the oil is reduced to a low level, so as to improve the stability of the storage period.

(1) The first filtration. The crushed crude oil is preliminarily removed from the clarified oil tank and then pumped into the filter for filtration. The obtained primary filtered oil is pumped to the cooling pot. After it is cooled to a certain temperature, it is pumped into an oil tank with a cooling coil and left for refrigeration. .

(2) The second filter. The once filtered oil is allowed to stand still to further combine the easier-to-combine water-containing phospholipids. After a second filtration with strong water absorption, part of the polymerized phospholipids are separated to achieve filtering and polishing effects. Make the grease have excellent transparency, improve the sensory index, and further improve the stability of the storage period. After the filtered oil is allowed to stand, it is filtered twice by a plate and frame filter to obtain the finished sesame oil.