Home Food Production Machines The advantages and disadvantages of vacuum packaging canned food filled with nitrogen should be explained in separate articles

The advantages and disadvantages of vacuum packaging canned food filled with nitrogen should be explained in separate articles

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the main function of vacuum packaging is to remove oxygen to help prevent food deterioration. Its principle is also relatively simple. Because food mildew and deterioration are mainly caused by the activities of microorganisms, and the survival of most microorganisms (such as molds and yeasts) requires oxygen. Vacuum packaging uses this principle to pump out the oxygen in the packaging bag and food cells, Make micro objects lose their “living environment”. Experiments show that when the oxygen concentration in the packaging bag is ≤ 1%, the growth and reproduction speed of microorganisms will drop sharply. When the oxygen concentration is ≤ 0.5%, most microorganisms will be inhibited and stop reproduction. (Note: vacuum packaging can not inhibit the deterioration and discoloration of food caused by anaerobic bacteria and enzyme reaction, so it needs to be combined with other auxiliary methods, such as cold storage, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt pickling, etc.)

In addition to inhibiting the growth and reproduction of microorganisms, another important function of vacuum deoxidation is to prevent food oxidation. Because fat foods contain a large number of unsaturated fatty acids, they are oxidized by oxygen, which makes the food taste and deteriorate. In addition, oxidation also causes the loss of vitamin A and C, and the unstable substances in food pigments darken the color by oxygen. Therefore, deoxidization can effectively prevent food deterioration and maintain its color, aroma, taste and nutritional value.

The main function of vacuum inflatable packaging is not only the oxygen removal and quality assurance function of vacuum packaging, but also the functions of compression, gas resistance and preservation, which can more effectively maintain the original color, aroma, taste, shape and nutritional value of food for a long time. In addition, many foods are not suitable for vacuum packaging, but must use vacuum inflatable packaging. Such as crisp and fragile food, easily caked food, easily deformed and oily food, food with sharp edges and corners or high hardness that will pierce the packaging bag, etc. After the food is vacuum inflated and packaged, the inflation pressure in the packaging bag is greater than the atmospheric pressure outside the packaging bag, which can effectively prevent the food from being crushed and deformed under pressure and does not affect the appearance of the packaging bag and the printing and decoration.

Vacuum inflatable packaging is filled with nitrogen, carbon dioxide, oxygen, single gas or a mixture of two or three gases after vacuum. The nitrogen is an inert gas, which plays a filling role and keeps the positive pressure in the bag, so as to prevent the air outside the bag from entering the bag and protect the food. Its carbon dioxide can dissolve in all kinds of fat or water and lead to carbonic acid with weak acidity. It has the activity of inhibiting microorganisms such as molds and spoilage bacteria. Its oxygen can inhibit the growth and reproduction of anaerobic bacteria and keep fruits and vegetables fresh and healthy

Color, high concentration of oxygen can keep fresh meat bright red
2 canned food has many advantages

nitrogen charging has high cost, high requirements for production environment and short shelf life. Its advantage is that it can keep the original flavor and nutrition of food; Vacuum packaging can not be used as storage conditions independently, but also needs low-temperature sterilization. It has heating damage to food. The essential period of low-temperature sterilization is short, and its advantages are low cost and convenience; Canned food has long shelf life and good storage and transportation. The disadvantage is that it needs high-temperature sterilization, which has great damage to food, high cost and low nutrition.

the bag of vacuum tank will be flat and easy to leak. This is not the case with nitrogen. There is no pressure difference like atmospheric pressure

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