Usually, it's normalvacuum tumblerThe vacuum degree ranges from 0.04 to 0.08 megapascals, depending on the specific packaging! Vacuum packaging is a packaging technique in which items are placed in airtight containers and air is drawn out to create a vacuum before the container is sealed, resulting in a sealed container with almost no air inside. The methods of vacuum packaging are different according to the exhaust method, including heating exhaust and vacuum sealing. The former is achieved by first heating the packaging container filled with food, expelling the air from the packaging container through thermal expansion and cooling of the air and evaporation of moisture in the food, and then sealing and cooling it to create a certain degree of vacuum inside the packaging container.
        The process of vacuum sealing is carried out on a vacuum packaging machine, where the air in the packaging container is extracted by a vacuum pump. Once a certain degree of vacuum is reached, the container is immediately sealed to create a vacuum state.
        Compared with the heating exhaust method, the suction sealing method can reduce the heating time of the contents and better preserve the color, aroma, and taste of the food. Therefore, the suction sealing method is widely used, especially for products with slow heating exhaust conduction. The vacuum rolling machine is a food container packaged using vacuum packaging technology, with a vacuum degree typically ranging from 600 to 1333 Pa. So, vacuum packaging cannot actually achieve complete vacuum, and it is unnecessary. Therefore, vacuum packaging is also known as pressure reducing packaging or exhaust packaging.