03月03 Vacuum packaging bag how to keep food fresh?
In fact, the principle of vacuum packaging machine is not complicated, one of the most important part is to remove the oxygen inside the packaging products. Only the packaging bags and food oxygen out, and then sealed packaging, to avoid air into, it will not happen to reflect the oxidation, achieve the final preservation.Vacuum packaging bag is conducive to the prevention of food deterioration, the principle of performance, due to food mold rot deterioration caused by the activities of microorganisms, and most microbial survival depends on oxygen, and vacuum packaging is the use of this principle, the bag Inside and food cells within the oxygen removed, so that microbial loss of “living environment.” Vacuum packaging can not inhibit the growth of anaerobic bacteria and enzyme reactions caused by food deterioration and discoloration, and therefore need to be combined with other auxiliary methods, such as cold storage, quick-freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salted.
Because oil and fat foods contain a large number of unsaturated fatty acids, the role of oxygen and oxidation, so that food taste, deterioration. In addition, the oxidation also makes vitamin A and vitamin C loss, food pigment in the unstable material by the role of oxygen, the color darkens. Therefore, the oxygen can effectively prevent food deterioration, to maintain its color, smell, taste and nutritional value.
Another way is vacuum inflatable packaging .There are mainly pressure, gas, fresh and so on, can more effectively keep the food long-term color, smell, taste, shape and Nutritional value. In addition, there are many food should not use vacuum packaging, and must be vacuum inflatable packaging. Such as crispy fragile food, easy to agglomerate food, easily deformed oil products, sharp edges and corners or higher hardness will puncture the packaging of food.After vacuum inflatable packaging, the bag inflatable pressure is greater than the pressure outside the bag, can effectively prevent the food pressure broken deformation, does not affect the appearance of packaging bags and printing and decorating.
Vacuum inflatable packaging in a vacuum and then filled with nitrogen, carbon dioxide, oxygen, a single gas or 2-3 kinds of gas mixture. Where nitrogen is an inert gas, from the filling effect, so that the bag to maintain a positive pressure to prevent the bag outside the air into the bag, the food play a protective role. Carbon monoxide can be dissolved in various types of fat or water, the formation of acid weak carbonic acid, inhibit the mold, bacteria and other microbial activity of corruption. Oxygen has the effect of inhibiting the growth and reproduction of anaerobic bacteria, keeping the freshness and color of fruits and vegetables, and the high concentration of oxygen can keep the fresh meat fresh.