Although the factory buildings are dilapidated and the machinery is less advanced, the oil extracted from the old oil mill is original, rich in fragrance, rich in vitamin E and has a long shelf life. Generally processed on site. Oil pressing in oil mills is mostly a side job, usually started after autumn, and the stalls are closed before the busy spring plowing. Peanuts, soybeans, rapeseed, sesame, cottonseed, etc. are used as raw materials for oil extraction. The residue left after pressing oil is collectively called cake because of its round shape. Bean cake, peanut cake, and cottonseed cake are all excellent feed and organic fertilizers.