The main role of oxygen is vacuum packed in order to help prevent food spoilage , the principle is relatively simple, due to deterioration of food mold rot caused mainly by microbial activity, and most microorganisms ( such as yeast and mold ) require oxygen for survival , while the vacuum packaging is the use of this principle, the packaging bag and oxygen deprived of food within the cell , so that microbes lost ” living environment .” Experimental results show: When the oxygen concentration of 1% packaging bags , the rate of microbial growth and reproduction on a sharp decline in oxygen concentration 0.5%, most microorganisms will be inhibited and stop breeding . ( Note : Vacuum packaging can not inhibit the propagation of food spoilage and discoloration caused by anaerobic bacteria and enzyme reactions , and therefore need to be combined with other complementary methods, such as refrigerated , frozen , dehydrated , high-temperature sterilization, irradiation sterilization , microwave sterilization , salt marinated plastic packaging design , etc. ) in addition to the vacuum oxygen inhibit microbial growth and reproduction , another important function is to prevent food oxidation , because a lot of fats and oils in food unsaturated fatty acids , the role of oxidation by oxygen -containing , make food taste, bad. In addition, the oxidation of vitamin A and vitamin C loss , the role of oxygen in food coloring by unstable substances , the color darkens . Therefore, the oxygen can effectively prevent food spoilage and maintain its color, smell , taste and nutritional value.

The main clear plastic packaging role of vacuum inflatable packaging vacuum packaging with the addition of oxygen shelf features, there is also the role of compression, gas barrier , preservation , etc., can make food more effectively long-term to maintain the original color, smell, taste, shape and nutritional value. In addition, there are many food vacuum packaging should not be used , but must be inflated by vacuum packaging . Such as crispy or crunchy foods, caking food, go easy deformation food oil , sharp edges or high hardness will vac tray pierce bags of food. After vacuum inflatable food packaging, packaging bag inflatable bag outside pressure greater than atmospheric pressure , can effectively prevent the deformation of food crushing pressure does not affect the appearance of bags and printing and decorating .

Inflatable packaging vacuum and refilled with nitrogen in a vacuum , carbon dioxide , oxygen or a single gas gas gas mixture of 2-3 . Nitrogen is an inert gas which , from the filling to make the bag to maintain a positive pressure to prevent outside air from entering the bag bag , food plays a protective role. Carbon monoxide gas can dissolve all types of fat or water to form weak carbonic acid , inhibit mold, bacteria and other microorganisms corrupt activity . Oxygen inhibits the growth of anaerobic bacteria breeding , keeping fruits, vegetables and fresh colors, high concentrations of oxygen can maintain its bright red fresh meat .

Vacuum packing

Curing products : sausages , ham, bacon, duck , etc. ; pickles : mustard , radish , turnip , pickles , etc. ; soy : tofu, vegetarian chicken , hummus , etc. ; cooked food products : chicken , duck , beef sauce ; convenience foods : rice , instant wet noodles, cooked vegetables , etc. ; soft canned food : water bamboo shoots , fruit syrup , clamshell packaging rice pudding and so on.

Vacuum plastic trays inflatable packaging

Tea, nuts, melon seeds, floss , etc. ; fried potato chips , puffed food , fruit and vegetables crisps , etc. ; cake, moon cake , etc. ; various powders , food additives ; various souvenirs , expensive medicines ; kinds of dehydrated vegetables .

Vacuum packaging or vacuum packaging used inflatable three- layer composite aluminum thin film or composite film made ??of trilateral seal bags, composite film thickness is generally between 60-96m , which is the inner heat seal layer , the need for good heat-sealing properties , a thickness of between 50-80m, the outer sealing layer , the need for good air tightness and printability , between 10-16m in certain plastic packaging strength , thickness. Common polyethylene inner layer composite film substrate (PE), such as high temperature plastic packaging box cooking bag then use high temperature polypropylene (CPP), the outer layer of oriented polypropylene substrate used (OPP), polyester (PET), nylon (PA) , etc. . Some foods such as tea , milk and other high-fat foods , and some require the use of light-blocking packaging to prevent food affected by the change of light color , smell, taste , and its approach is the substrate between the outer and inner layers of composite thin layer of aluminum foil (AL), which has also been enhanced airtightness .

Vacuum or vacuum packaging machine used inflatable cavity and outside pumping two kinds of models. Chamber vacuum packaging machine is divided inflatable packaging machines and vacuum packaging machines . Outside pumping vacuum packing machine with vacuum packaging and inflatable packaging , and several other functions , so called multi-functional plastic box packaging machine . Packaging machines need to buy packaged goods according to the form , the size of the packaging capacity , production volume , the use of a combination of factors to consider , such as the manner in which the packaging , it is best to consult after purchase .

Food vacuum and vacuum inflatable flexible packaging technology , occupies a certain position in the food packaging technology , some features and functions can not be easily replaced other packaging technologies . Our vacuum packaging technology in the early 1980s developed, while filling the vacuum packaging technology in the early 1990s began to use a small amount , with the promotion and development of small supermarket packaging , its scope will be more widely some will gradually replace rigid packaging , the prospects are very promising.