Application of Food Vacuum Packaging and Vacuum Inflatable Flexible Packaging

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 microorganisms lose the "survival environment" Experiments show that: When the oxygen concentration in the bag is ≤ 1%, the growth of microorganisms and The rate of reproduction declines sharply. 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 enzyme 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.)

In addition to inhibiting the growth and reproduction of microorganisms, vacuum deoxidation is another important function to prevent food oxidation. Because oils and fats contain a large amount of unsaturated fatty acids, they 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 deterioration of foods and maintain their color, flavor, and nutritional value.

The main function of vacuum inflatable packaging, in addition to the vacuum packaging has the function of oxygen removal and quality assurance, there are mainly the role of pressure, gas barrier, preservation, etc., can more effectively make the food long-term maintain the original color, flavor, shape and nutritional value. In addition, many foods are not suitable for vacuum packaging and must be vacuum-packed. 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.

The vacuum inflated package is filled with nitrogen, carbon dioxide, a single oxygen gas, or a mixture of 2-3 gases after vacuum. Its nitrogen is an inert gas, which acts as a filling to maintain a positive pressure inside the bag to prevent air outside the bag from entering the bag. This has a protective effect on the food. Its carbon dioxide can be thicker than various types of fat or water, leading to weak acidity. Carbonic acid, which inhibits the activity of microorganisms such as moulds and spoilage bacteria, inhibits the growth and reproduction of anaerobes and maintains the freshness and color of fruits and vegetables. High concentrations of oxygen can keep fresh meats bright red.

Vacuum packaging 1 Curing products: sausage, ham, bacon, duck, etc. 2 pickled pickles: mustard, radish, kohlrabi, kimchi, etc. 3 Soy products: dried bean curd, vegetarian chicken, bean paste, etc. 4 Cooked food products: chicken, roast duck, Sauce beef, etc. 5 Convenient foods: rice, instant wet noodles, cooked vegetables, etc. 6 Soft cans: water bamboo shoots, sugar water fruit, rice pudding, etc.

Vacuum inflatable packaging 1 Tea, nuts, melon seeds, floss and so on. 2 Fried potato chips, puffed food, fruit and vegetable chips, etc. 3 cakes, moon cakes and so on. 4 various powders, food additives. 5 A variety of valuable natural Chinese herbal medicines. 6 various dehydrated vegetables.

Vacuum packaging or vacuum inflatable packaging commonly used double-layer composite film or three-layer aluminum thin composite film made of three-side sealing bags, composite film thickness is generally between 60-96UM, in which the inner layer of the heat seal layer, need to have a good Heat sealing, thickness between 50-80um, the outer layer is a sealing layer, needs good airtightness and printability, a certain strength, thickness between 10-16UM. Composite film inner substrate commonly used poly Ethylene (PE), such as high-temperature cooking bag with high temperature polypropylene (CPP), the outer layer of the substrate is commonly used in polypropylene (OPP), polyester (PET), nylon (PA) and so on. Some foods such as tea, milk powder, etc., and some high-oil foods need to use light-blocking packaging to prevent food from changing its color, smell and taste under the influence of light. The method is to laminate a thin layer of aluminum foil (AL) between the inner and outer layers of the substrate, and the hermeticity is also strengthened.

Vacuum or vacuum inflatable packaging machine commonly used cavity type and external pumping two kinds of models. Chamber packaging machine is divided into vacuum packaging machine and vacuum inflator. The external pumping packaging machine has several functions such as vacuum packaging and vacuum inflation packaging, so it is also called multifunctional modified atmosphere packaging machine. According to the factors such as the form of the packaged goods, the size of the packaging capacity, the production volume, and the packaging method, the packaging machine must be consulted and purchased first.

The vacuum and vacuum inflatable soft packaging technology of foods occupies a certain position in food packaging technology, and some functions and functions cannot be easily replaced by other packaging technologies. China's vacuum packaging technology was developed in the early 1980s, and vacuum inflatable packaging technology has just started to be used in small quantities in the early 1990s. With the promotion of small packaging and the development of supermarkets, its application scope will become more and more extensive. Some will gradually replace hard packaging and the outlook will be very promising.