Principle of vacuum sealing machine
The vacuum sealing machine puts the food into the packaging bag, extracts the air in the packaging bag, and completes the sealing process after reaching a predetermined vacuum degree. It can have the following functions: 1. Pumping + sealing the bag; 2. Sealing the bag directly; 3. Pumping the bag + filling nitrogen or other gases + sealing. Most household vacuum machines have the function of pumping and sealing.
Vacuum sealing machine function
1. The main function of vacuum packaging is to remove oxygen to help prevent food from spoiling. The principle is also relatively simple. Because food mildew and spoilage are mainly caused by the activities of microorganisms, the survival of most microorganisms (such as molds and yeasts) is Oxygen is needed, and vacuum packaging uses this principle to extract oxygen in the packaging bag and food cells, so that microorganisms lose their living environment.
Experiments have proved that when the oxygen concentration in the packaging bag is less than or equal to 1%, the growth and reproduction speed of microorganisms will drop sharply. When the oxygen concentration is less than or equal to 0.5%, most microorganisms will be inhibited and stop reproducing.
(Note: Vacuum packaging cannot inhibit the growth of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reactions, so it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt Marinated etc.)
2. In addition to inhibiting the growth and reproduction of microorganisms, vacuum deoxygenation has another important function to prevent food oxidation. Because fats and oils contain a large amount of unsaturated fatty acids, they are oxidized by the action of oxygen, which makes food taste and deteriorate.
In addition, oxidation It also causes the loss of vitamin A and C, and the unstable substances in food pigments are affected by oxygen to darken the color. Therefore, deoxygenation can effectively prevent food from spoiling.
3. In addition to the oxygen-removing and quality-preserving functions of vacuum packaging, vacuum inflatable packaging also has the functions of pressure resistance, gas barrier, and preservation, which can more effectively maintain the original color, aroma, taste and shape of food for a long time. And nutritional value.
The sealed food can prolong the fresh-keeping period at room temperature, which can effectively prevent the food in the refrigerator from odor, deterioration, dehydration and cracking. This machine applies vacuum to items or food that need to be stored for a long time, such as medical supplies, electronic devices, audio-visual products, cameras, woolen clothes, gold and silver jewelry, antique calligraphy and painting, dried and fresh fruits, tea, raw and cooked meat, etc. After encapsulation, it can effectively play the role of freshness, quality, moisture, mildew, rust, pollution, oxidation and vacuum sterilization, thereby extending the shelf life. The various soft-packaged foods encapsulated by this machine are convenient to carry and suitable for field operations and business travel.
All kinds of food sealed by this machine can not only extend the shelf life at room temperature. If used in conjunction with a refrigerator, the effect is better. It can effectively prevent the food in the refrigerator from dehydration, cracking, odor and deterioration.