The application scope of the hottest food vacuum i

2022-08-01
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The main function of vacuum packaging is to remove oxygen, so as to prevent food deterioration. The principle is also relatively simple, because food mildew is mainly caused by the activities of microorganisms, and most microorganisms (such as mold and yeast) need oxygen to survive. Vacuum packaging uses this principle to remove the oxygen in the packaging bag and food cells, so that the microorganisms lose their "living environment". Experiments show that when the oxygen concentration in the packaging bag is ≤ 1%, the growth and reproduction speed of microorganisms will drop sharply, and the oxygen concentration is ≤ 0.5%, most microorganisms will be inhibited and stop reproduction (Note: vacuum packaging can not inhibit the reproduction of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reaction, so it needs to be combined with other auxiliary methods, such as cold storage, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt pickling, etc.). In addition to inhibiting the growth and reproduction of radial force microorganisms generated by the oil pressure of the hydraulic system of the hydraulic universal testing machine, another important function of vacuum deoxidization is to prevent food oxidation. Because fat foods contain a large number of unsaturated fatty acids, they are oxidized by oxygen, which makes the food taste and deteriorate. In addition, oxidation will also cause the loss of vitamin A and vitamin C, and the unstable substances in food pigments will be oxidized to darken the color. Therefore, deoxidization can effectively prevent food deterioration and maintain its color, aroma, taste and nutritional value

the main function of vacuum inflatable packaging is not only to eliminate oxygen and ensure quality, but also to resist pressure, block gas and keep fresh. It can more effectively keep the original color, aroma, taste, shape and nutritional value of food for a long time. In addition, vacuum packaging is not suitable for many foods, but vacuum inflatable packaging must be used. Such as fragile food, food easy to agglomerate, food easy to deform and ooze oil, food with sharp edges and corners or food with high hardness that will puncture the packaging bag, etc. After the food is vacuum inflated and packaged, the inflation pressure in the packaging bag is greater than the atmospheric pressure outside the packaging bag, which can effectively prevent the food from being crushed and deformed under pressure, and does not affect the appearance of the packaging bag and the printing decoration

after vacuum, the vacuum inflatable package is filled with a single gas of nitrogen, carbon dioxide and oxygen or a mixture of 2 - 3 gases. Nitrogen is an inert gas, which plays a filling role to keep the positive pressure in the bag, so as to prevent the air outside the bag from entering the bag and protect the food. Carbon dioxide gas can dissolve in various fats or water to form carbonic acid with weak acidity, which can effectively inhibit the activity of microorganisms such as molds and spoilage bacteria. Oxygen can inhibit the growth and reproduction of anaerobic bacteria. After replacement, it can keep fruits and vegetables fresh and colorful. High concentration of oxygen can keep fresh meat bright red

vacuum packaging includes: cured products: sausage, ham, bacon, salted duck, etc; Pickles: pickled mustard, dried radish, turnip, pickle, etc; Bean products: dried bean curd, vegetarian chicken, bean paste, etc; Cooked food products: roast chicken, roast duck, sauce beef, etc; Instant food: rice, instant wet noodles, cooked vegetables, etc; Soft cans: bamboo shoots in clear water, fruit in sugar water, eight treasures porridge, etc. Vacuum inflatable packaging includes: tea, nuts, melon seeds, meat floss, etc; Fried potato chips, puffed food, fruit and vegetable chips, etc; Cake, moon cake, etc; Various powders and food additives; Various local specialties and precious Chinese medicinal materials; Various dehydrated vegetables, etc

No. 1 in the chemical industry

vacuum packaging or vacuum inflatable packaging are commonly used in three side sealed packaging bags made of double-layer composite film or three-layer aluminum foil composite film, and the thickness of the composite film is generally 60 - 96 μ M, of which the inner layer is a heat sealing layer with good heat sealing property and a thickness of 50- 80 μ M. the outer layer is a sealing layer with good air tightness, printability and certain strength. The thickness is 10 -16 μ M. It may take several hours for the inner base of the composite film to be made of polyethylene (PE), such as high-temperature polypropylene (CPP) for high-temperature cooking bags, and tensile polypropylene (OPP), polyester (PET), nylon (PA) for the outer base materials. Some foods such as tea, milk powder, etc. and some high fat foods need to be packaged with light blocking packaging to prevent the food from changing its color, aroma and taste due to the influence of light. The method is to compound a very thin aluminum foil (AL) between the inner and outer base materials, and its air tightness is also strengthened

vacuum or vacuum inflatable packaging machines are commonly used in cavity type and external pumping type. Cavity packaging machine is divided into vacuum packaging machine and vacuum inflatable packaging machine. External pumping packaging machine has several functions such as vacuum packaging and vacuum inflatable packaging, so it is also called multi-functional modified atmosphere packaging machine. The selection and purchase of the packaging machine shall be based on the shape of the packaging items, the size of the packaging capacity, the production batch, the packaging method and other comprehensive factors. It is best to consult before purchasing

vacuum and vacuum aerated flexible packaging technology of food occupy a special position in food packaging technology. China's vacuum packaging technology developed in the early 1980s, while the vacuum inflatable packaging technology began to be used in a small amount in the early 1990s. With the promotion of small packaging and the development of supermarkets, its scope of application will be more and more extensive

reprinted from: China Packaging News

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