Food vacuum packaging and vacuum inflatable flexible packaging
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core tips: vacuum packaging: put food into the packaging bag, extract the air from the packaging bag, and complete the sealing process after reaching the predetermined vacuum
[China Packaging News] vacuum packaging: put food into the packaging bag, extract the air from the packaging bag, After reaching the predetermined vacuum degree, complete the sealing process
vacuum aerated packaging: put the food into the packaging bag, extract the air in the packaging bag to reach the predetermined vacuum degree, and then fill in nitrogen or other mixed gas, and then complete the sealing process
1. Action mechanism
the main function of vacuum packaging is to remove oxygen, which is conducive to preventing food deterioration. Its principle is also relatively simple, because the moldy 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 uses this principle to remove the oxygen in the packaging bag and food cells, so that the microorganisms lose their survival. The environmental experiment shows that when the oxygen concentration in the packaging bag is 1%, the growth and reproduction speed of microorganisms will drop sharply, and when the oxygen concentration is 0.5%, most microorganisms will be inhibited and stop reproduction. (Note: vacuum packaging can not inhibit the propagation of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reaction, so it also 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 propagation of microorganisms, vacuum deoxidization has another important function to prevent food oxidation, because fat foods contain a large amount of unsaturated fatty acids, which are subject to oxygen In addition, oxidation also causes the loss of vitamin A and C, and the unstable substances in food pigments are affected by oxygen to darken the color. Therefore, deoxidization can effectively prevent food from deteriorating and maintain its color, aroma, taste and nutritional value.
in addition to the deoxidization and quality assurance functions of vacuum packaging, the main functions of vacuum inflatable packaging are compression resistance, gas resistance and fresh-keeping, which can more effectively maintain the original color, aroma, shape and nutritional value of food for a long time. In addition, many foods are not suitable for vacuum packaging but must be vacuum inflatable packaging. Such as crunchy and fragile food, easily caked food, easily deformed and oily food, food with sharp edges and corners or high hardness that will puncture the packaging bag, etc. After the food is vacuum inflated, 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. The 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. Its carbon dioxide can be thicker than all kinds of fat or water, leading to carbonic acid with weak acidity, and has the activity of inhibiting molds, spoilage bacteria and other microorganisms. Its oxygen can inhibit the growth and reproduction of anaerobic bacteria and keep fruits and vegetables fresh and colorful. High concentration of oxygen can make fresh meat keep its bright red
2. Scope of application
cured products: sausage, ham, cured meat, salted duck, etc.
pickled vegetables: mustard, dried radish, turnip, pickled vegetables, etc.
bean products: dried tofu, vegetarian chicken, bean paste, etc.
cooked food products: roast chicken, roast duck, Soy sauce beef and other convenient foods: rice, instant wet noodles, cooked vegetables, etc.
soft cans: fresh bamboo shoots, sugar fruit, Babao porridge, etc.
vacuum inflatable packaging
tea, nuts, melon seeds, meat floss, etc.
fried potato chips, puffed food, fruit and vegetable chips, etc.
cakes, moon cakes, etc.
all kinds of powders. Food addition actively encourages new material enterprises to apply for the governor's quality award Shandong famous brand product agent
various local specialties and precious Chinese medicinal materials
various dehydrated vegetables
3, flexible packaging materials
vacuum packaging or vacuum inflatable packaging are commonly used as three side sealing packaging bags made of double-layer composite film or three-layer aluminum thin composite film. The thickness of the composite film is generally between um, of which the inner layer is a heat sealing layer, which needs to have good heat sealing property. The thickness is between um, and the outer layer is a sealing layer, It shall have good air tightness and printability, certain strength and thickness between um. Polyethylene (PE) is commonly used as the inner base material of the composite film. For example, high-temperature resistant polypropylene (CPP) is used as the high-temperature cooking bag, and stretched polypropylene (OPP), polyester (PET), nylon (PA) is commonly used as the outer base material. 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 color, aroma and taste due to the influence of light. However, the food packaging and catering industry in the city has issued a strong protest. The method is to compound an extremely thin aluminum foil (AL) between the inner and outer base materials, and its air tightness has also been strengthened
4 Packaging machine
vacuum or vacuum inflatable packaging machines are commonly used in cavity type and external extraction 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 of packaging machine should be considered according to 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 first and then purchase
the vacuum selection of food is certainly based on the pressure testing machine or the configuration of the microcomputer controlled pressure testing machine and the vacuum inflatable soft packaging technology, which occupy a certain position in the food packaging technology, Some functions and functions cannot be easily replaced by other packaging technologies. 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, and some will gradually replace hard packaging. The prospect will be very promising
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