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. Its principle is also relatively simple. Because the deterioration of food is mainly caused by the activities of microorganisms, 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 drops 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 anaerobes and the deterioration and discoloration of foods caused by enzymatic reactions. Therefore, it is necessary to cooperate with others. Supplementary methods such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salting, etc.)

Apart from inhibiting the growth and reproduction of microorganisms, vacuum deoxidation 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, causing 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, fragrance, taste and nutritional value.

The main role of vacuum inflatable packaging, in addition to the vacuum packaging has the function of oxygen and quality, there are mainly pressure, gas barrier, preservation and other effects, can more effectively maintain the original color, flavor, shape and nutritional value of food for a long time In addition, many foods are not suitable for vacuum packaging and must use vacuum inflatable packaging. Such as crisp and fragile food, easy to cake food, easily deformed oil food, there are sharp corners or high hardness will pierce the bag of food, etc. 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 being broken and does not affect the appearance and printing decoration of the bag.

Vacuum inflated packaging is filled with nitrogen, carbon dioxide, single oxygen gas or mixed gases of 2-3 gases after vacuum. Nitrogen is an inert gas and plays a filling role to maintain a positive pressure inside the bag to prevent air outside the bag from entering the bag. Inside, it plays a protective role for foods. Its carbon dioxide can be concentrated in various types of fats or water, leading to weak acidity of carbonic acid, and inhibiting the activity of microorganisms such as molds and spoilage bacteria. Its oxygen can inhibit the growth and reproduction of anaerobes. Keep the freshness and color of fruits and vegetables. High concentration of oxygen can keep fresh meats bright red.

Vacuum packaging

1 Curing products: sausage, ham, bacon, duck, etc. 2 pickles: mustard, dried radish, kohlrabi, pickles, etc. 3 Soy products: dried bean curd, vegetarian chicken, bean paste, etc.

4 Cooked food products: roast chicken, roast duck, sauce beef, etc. 5 Convenient food: rice, instant wet noodles, cooked dishes, etc. 6 soft cans: water bamboo shoots, sugar water fruit, rice porridge, etc.

Vacuum inflatable packaging

1 Tea, nuts, melon seeds, floss, etc. 2 Fried potato chips, puffed foods, fruit and vegetable crisps, etc. 3 Cakes, moon cakes, etc. 4 Various powders, food additives. 5 Various local specialty rare 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, need 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 base material is commonly used for stretching polypropylene (OPP), polyester (PET), nylon (PA), etc. Some foods such as tea, Milk powder, etc., and some high-oil foods need to use light-blocking packaging to prevent the 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. Hermeticity has also been strengthened.

Vacuum or vacuum inflatable packaging machine commonly used cavity type and external pumping two kinds of models. The cavity packaging machine is divided into vacuum packaging machine and vacuum inflatable packaging machine. External pumping packaging machine has vacuum packaging and vacuum inflatable packaging and other functions, It is also called multi-functional air-conditioning packaging machine. Optional packaging machine needs to consider the form of packaging items, the size of the packaging capacity, production volume, packaging and other comprehensive factors to consider, it is best to consult after purchase.

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. Vacuum packaging technology in China was developed in the early 1980s. 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, the scope of application will become more and more extensive. Some will gradually replace hard packaging, and the outlook will be very promising.