1¡¢the definition of
£  £  into vacuum-packed food packaging bags, packaging bags out of the air, reaching pre-determined vacuum after the sealing process to complete.
Vacuum packed inflatable packaging food packaging bags, packaging bags out of the air to reach the target vacuum, then filled nitrogen or other gas mixture, and then complete the sealing process.
2¡¢the role and mechanism of
£  £  The main function of vacuum-packed is the deaerator in order to facilitate the prevention of food deterioration, and its principle is also relatively simple, due to food mycophenolate rot mainly by the deterioration caused by microbial activity, and most micro-organisms (such as mold and yeast) is the survival of the need for oxygen, and vacuum packaging is the use of this principle, the bags and food packaging cells deprived of oxygen, so that micro-structures were lost, "the survival of the environment." Experiments show: When the packaging bag of oxygen concentration ¡Ü 1%, the microbial growth and reproduction rate of the sharp decline in oxygen concentration of ¡Ü 0.5%, most micro-organisms will be inhibited and stop breeding. (Note: The vacuum-packed can not inhibit the propagation of anaerobic bacteria and enzyme reaction caused by food deterioration and discoloration, it needs to be combined with other auxiliary methods, such as refrigerated, frozen, dehydrated, heat sterilization, irradiation sterilization, microwave sterilization, salt pickled, etc..)
£  £  In addition to the vacuum deaerator inhibition of microbial growth and reproduction, another important function is to prevent food oxidation, due to oil products contained a large number of unsaturated fatty acids, the role of oxygen and oxidation, so that food±äζ, metamorphism, in addition, oxidation also the loss of vitamin A and C, food coloring substances subject to the instability in the role of oxygen, so that darken the color. Therefore, the deaerator can effectively prevent deterioration of food to maintain their color, flavor and taste and nutritional value.
£  £  inflatable vacuum packaging vacuum packaging a major role in addition to available Deoxidization durability features, the main there are compression, gas-barrier, and preservation, such as the role more effectively to make food a long time to maintain the original color, flavor and taste, shape and nutritional value. In addition, there are many inappropriate use of vacuum-packed food must be inflated by vacuum packaging. Fragile foods such as crisp, easy caking of food, go easy deformation of the oil the food, there are sharp edges and corners or higher hardness will pierce the bag of food. Inflated by vacuum packaging the food, the packaging bag inflatable bag outside pressure greater than atmospheric pressure, and can effectively prevent the food does not affect the deformation pressure broken appearance of the packaging bag and printing decoration.
£  £  inflatable vacuum packaging in a vacuum and then filled with nitrogen, carbon dioxide, oxygen single gas or gas mixture of 23 kinds of gas. Its nitrogen is an inert gas, filling the role of starting to make bags to maintain positive pressure to prevent outside air into the bag bags, food plays a protective effect. Its carbon dioxide to dissolve in various types of fat or water, citing the weak acid into carbonic acid, it inhibited mold, bacteria and other microorganisms corrupt activity. Its oxygen can inhibit the growth of anaerobic bacteria breeding, to keep fruits, vegetables and fresh color, high concentrations of oxygen can fresh meat to maintain its bright red.
3¡¢the scope of application
Vacuum-packed
1.pickled products: sausages, ham, bacon, dry salted duck and so on. 2 preserved vegetables: mustard, turnip dry, pickled vegetables and so on. 3 bean products: tofu, chicken,
Red bean paste and so on. 4 cooked food products: chicken, duck, beef and sauce. 5 convenience foods: rice, ready-to-eat wet noodle, such as ready meal. 6 soft canned: Shimizu bamboo shoots, sugar fruits, such as eight-treasure porridge.
Inflatable vacuum packaging
1 tea, nuts, kernels, dried meat floss and so on. 2 fried potato chips, puffed food, fruit and vegetable crisps and so on. 3 cakes, moon cakes and so on. 4 all kinds of powder, food additives. 5 a variety of native products, expensive Chinese herbal medicines. 6 various dehydrated vegetables.
4¡¢flexible packaging materials
£  £  inflatable vacuum packaging or vacuum packaging commonly used double-composite film or aluminum foil composite film made of three triangular sealing bags, composite film thickness is normally between 60 96UM, in which the inner layer for the heat sealing layer, the need for good sealing, the thickness of between 50 80UM, for sealing the outer layer, the need for good air tightness and printability, a certain intensity, between 10 16UM thickness. Compound commonly used polyethylene film inner layer of the substrate (PE), such as high-temperature retort pouch using high temperature polypropylene (CPP), commonly used substrate stretching the outer polypropylene (OPP),polyester ?(PET), nylon (PA ) and so on. Some foods such as tea, milk powder and other high fat foods, and some require the use of stop light packaging, in order to prevent the effects of food by the light to change the color, flavor and taste, and its method is in between the inside and outside the two-tier matrix composite thin layer of aluminum foil (AL), its air tightness has also been strengthened.
5¡¢packing machine
£  £  vacuum or a vacuum packaging machine used inflatable cavity and outside the two kinds of pump-style model. Cavity was divided into a vacuum packaging machine packing machine and vacuum packaging machine inflatable. Outside the pump-type packaging machine with vacuum packaging and vacuum packaging inflatable several functions, it is also known as multi-functional modified atmosphere packaging machine. Buy packaging machine according to the form of packaging materials, packaging capacity, size, production quantities, packaging, etc., in what manner a combination of factors to consider, it is best to consult after the procurement.
6¡¢concluding remarks
£  £  food vacuum and vacuum inflatable flexible packaging technology, in food packaging technology occupies a certain location, some of the functions and role are not easily detected by other alternative packaging technology. China's vacuum packaging technology is developed in the early eighties, and vacuum packaging technology inflatable beginning in the early nineties a small amount of use, with the small packaging and supermarkets to promote the development of the scope of its application will become more and more widely Some will be gradually to replace the hardware packaging, will be very optimistic about the prospects.
£  £  Excerpt from: "Food and Machinery" in May 1997 Author: chen jia zhong