The advantages and disadvantages of oil press equipment for hot press and cold press
Oil pressing process is to use the external force produced by the screw oil press equipment to extrude the oil and extract the edible oil. Oil extraction process: steam stir-frying a press a hair of oil slag removal, because of the temperature of the press and oil extraction process is divided into hot pressing and cold pressing, what is the difference between the two?
First of all, the production process of the two is different. Cold oil pressing is in the state of oil pressing without heating or low temperature. The extracted oil has a low temperature, low acid value and generally does not require refining. After precipitation and filtration, the product oil is obtained. However, most of the vegetable oil in cattle is hot oil, that is, before the oil is pressed, the oil is cleaned, broken and heated at high temperature, so that a series of changes take place inside the oil: the destruction of oil cells, the promotion of protein denaturation, the reduction of oil viscosity, etc., in order to adapt to the oil pressing and improve the oil yield. Although cold pressed oil is authentic, it is a healthy choice for life, but most oils are not suitable for cold pressed, take soybean oil and high erucic rapeseed, cottonseed, peanut, sesame for example, soybean oil contains bean smell and high erucic rapeseed oil pungent, cottonseed oil in gossypol toxin and spoiled oil in the yellow frosting toxin, etc., need to be refined to remove. Fragrance oil and fragrant oil need to be hot pressed to obtain the aroma. Therefore, cold pressing is healthy, hot pressing is delicious, and hot pressing method is usually extracted after cleaning, crushing and high temperature heating treatment before oil pressing, so that a series of changes occur inside the oil: destruction of oil cells, promote protein denaturation, reduce oil viscosity, so as to be suitable for oil pressing, improve the oil yield. But the oil extracted from high-temperature oil is darker and has a higher acid value, so it needs to be refined before it can be eaten. At the same time, the bioactive substances (vitamin E, alcohol, carotenoid, etc.) in the high temperature oil pressing process lose a lot, causing a waste of resources. Generally, hot rolling needs to use hot rolling screw oil pressing machine.
Cold pressing oil method refers to the oil pressure before heating or low temperature, into the oil press, cold pressing method is generally processed in the environment of 60℃. Cold-pressed oil products retain the natural flavor and color of oil, and the physiological active substances in oil are completely preserved. The degree of protein denaturation is low, and the comprehensive utilization of protein is easy. The raw materials of cold pressed oil must be selected well, otherwise it will affect the quality of cold pressed oil. Generally speaking, cold pressed oil has low smoke point and unstable water content, which is not conducive to long-term storage. Here, the cold press is recommended for the cold press spiral press. The difference between hot pressed oil and cold pressed oil is that hot pressed oil has a pure taste and a rich fragrance, especially sesame oil, peanut oil and other oil. The downside is that when not processed, it bubbles when fried. Need to use centrifugal oil filter solution. Cold press oil color is better, relatively light, cold press oil pressure out of the oil taste is not sweet, not on fire. Cold pressed oil will not bubble when edible, and will not clog the pot.
