Vacuum machine

The composition of the vacuum machine: vacuum pump, motor, vacuum chamber, sealing strip, plexiglass plate cover, airbag, solenoid valve, etc.

1, the definition of vacuum packaging

The vacuum packaging packs the food into the packaging bag, draws out the air inside the packaging bag, and reaches the predetermined vacuum level, and completes the sealing process.

Vacuum inflating and packaging The food is packed in a packaging bag, the air in the packaging bag is drawn to a predetermined vacuum degree, and then nitrogen gas or other mixed gas is charged, and then the sealing process is completed.

2, the mechanism of action

The main role of vacuum packaging is to remove oxygen, so as to help prevent food spoilage, and the principle is relatively simple. The deterioration of food is mainly caused by the activity of microorganisms, and the survival of most microorganisms (such as molds and yeasts) requires oxygen. , and vacuum packaging is the use of this principle, the oxygen inside the packaging bag and food cells removed, so that the micro-objects lose "survival environment." Experiments show that when the oxygen concentration in the packaging bag is ≤ 1%, the growth and reproduction speed of microorganisms decreases rapidly. When the oxygen concentration is ≤ 0.5%, most microorganisms will be inhibited and stop breeding. (Note: Vacuum packaging does not inhibit the growth of anaerobic bacteria and the deterioration and discoloration of foods caused by enzymatic reactions. Therefore, it must be combined with other auxiliary methods such as cold storage, quick freezing, dehydration, high temperature sterilization, radiation sterilization, microwave sterilization, and salt. Marinated etc.)

Apart from inhibiting the growth and reproduction of microorganisms, vacuum deoxygenation is another important function to prevent food oxidation. Oils and fats contain a large amount of unsaturated fatty acids, which are oxidized by the action of oxygen, which causes foods to taste and deteriorate. In addition, oxidation also causes Loss of vitamins A and C. Unstable substances in food pigments are affected by oxygen and darken the color. Therefore, oxygen removal can effectively prevent food spoilage and maintain its color, aroma, taste and nutritional value.

The main role of vacuum inflatable packaging in addition to the vacuum packaging has the function of oxygen removal and durability, there are mainly pressure, gas barrier, preservation and other effects, can more effectively enable food to maintain the original color, aroma, taste, shape and Nutritional value. In addition, there are many foods that are not suitable for vacuum packaging and must be vacuum inflated. Such as crispy fragile foods, easy to block foods, easily deformed to go oil foods, there are sharp corners or high hardness will pierce the bag of food. After the food is inflated and packed in vacuum, the inflation pressure in the bag is stronger than the atmospheric pressure outside the bag, which can effectively prevent the food from crushing and deforming without affecting the appearance and printing decoration of the bag.

Vacuum inflated packaging is filled with nitrogen, carbon dioxide, oxygen single gas or a mixture of two or three gases after vacuum. Its nitrogen is an inert gas that acts as a filling to maintain a positive pressure inside the bag to prevent the air outside the bag from entering the bag and provide a protective effect on the food. Its carbon dioxide can be dissolved in various types of fats or water, leading to weak acidity of carbonic acid, and inhibiting the activity of microorganisms such as mold and spoilage bacteria. Its oxygen can inhibit the growth and reproduction of anaerobic bacteria, keep the freshness and color of fruits and vegetables, and high concentrations of oxygen can keep fresh meats bright red.