The traditional oil press process of the process of oil press machine

There are also oil presses only. But here is why the process is perfected. But oil extraction is divided into heating oil extraction and cold pressing process. The oil yield of cold pressing is low, and the oil yield of hot pressing is high. But if the hot press is not operated well, and there is overcooking in the process of frying, then the color of the oil will be darker. But the flavor is delicious.

The traditional handmade oil press consists of a double stove, a grinder, a large press trough and a hanging oil hammer. The oil presses are usually built on the banks of small streams where villages are concentrated, water is plentiful and trees cover the area. Oil pressing usually starts at the end of the fourth month of the lunar calendar every year. Taking rapeseed oil extraction as an example, the traditional oil extraction process can be roughly divided into seven steps:

First, frying dry. Will collect the raw wet rapeseed into the stove in the cauldron fried dry, fried dry standard is fragrant and can not be burnt, pay attention to control the size of the stove fire, which is related to whether the extraction of fragrant and pure oil, by a master control.

Second, grinding powder. Is the fried dry rapeseed thrown into the milling trough crushed. Mill power by the waterwheel (the initial power is ox-drawn, then the waterwheel drive, now developed to electric) drive, waterwheel and milling diameter are generally more than 4 meters, milling plate has three milling wheels, all the components are made of wood.

Third, steamed flour. Rapeseed crushed into powder after the wooden cauldron into a small pot to steam, usually one cake at a time, about 2 minutes, the standard of steaming is to see the steam but not cooked through, by a master control.

Fourth, do cake. Steam the cooked powder filled with straw bottom round iron hoop, made of embryo cake, a squeeze of 50 cakes, from the beginning of steaming powder to complete 50 cakes took about 2 hours. It is controlled by a single master.

Fifth, the press. The cakes are loaded into a trough cut from a log, and a wooden wedge is installed on the right side of the trough to start the press. Handmade oil press "host" is a thick "oil groove wood", the length must be more than 5 meters, the diameter of the cut surface can not be less than 1 meter, the center of the tree cut out a 2 meters long, 40 centimeters wide "oil groove ", the oil cake filled in the "oil groove", open the press, the master of the hammer, holding the hammer suspended in the air about 30 pounds of weight of the oil hammer, leisurely into the oil groove in the "into the pile" on the oil groove, then, was squeezed by the embryo cake will flow out of a Lou! Lou Lou golden oil, oil from the oil tank in the middle of the small mouth out. By a master control.

Sixth, out of the press. After two hours, the oil is almost exhausted, it can be out of the press, out of the order of the press, first remove the "wood into", then remove the stake, and finally remove the cake.

Seventh, into the tank. The oil will be poured into the vat, and sealed and preserved. The above seven steps is a complete traditional oil extraction process, with this wooden press in the extraction of sesame oil and mechanical pressing of sesame oil is very different, it is golden in color and flavor, low heat, low barrel without rapeseed sediment, and shelving time is also longer than the oil of the machine. With the progress of science, the renewal of oil extraction equipment, the traditional oil extraction process has been basically eliminated, the modern oil extraction process is gradually mature.