What is the difference between the shelf life of food vacuum packaging machine and modified atmosphere packaging machine?
Food vacuum packaging machines are generally used for the packaging of meat, seafood, aquatic products, soy products, etc., and the role of modified atmosphere packaging machines for fresh-keeping packaging is greater. The shelf life of a food product is the recommended shelf life of the product. There are two types of vacuum packaging and modified atmosphere packaging. What is the difference between the shelf life of the food they package? The working principle of the vacuum packaging machine is to use the chain drive, automatically swing the cover, and connect the conveyor belt to continue packaging. The vacuum packaging machine vacuumizes the packaging bags, so that the packaged products can achieve the functions of oxygen insulation, freshness preservation, dust prevention and oxygen removal. The shelf life of bagged food depends on what type of item it is. Dry foods take a long time, such as dried sweet potatoes with very low moisture content. Vacuum packaging machines have a history of nearly 20 years in my country and are still widely used. The shelf life of food vacuum packaging machines is longer than that of modified atmosphere packaging, because vacuum-packed cooked food can be heated at high temperatures to extend the shelf life. 12 months, raw food can be refrigerated after vacuum packaging, and the storage time can be up to 6 months. The specific storage time also depends on the specific product packaged. Modified atmosphere packaging also has a long history. As early as the 1930s, Europe and the United States began to study the use of CO2 gas to preserve meat products; in the 1950s, N2 and CO2 gases were developed to replace the air in canned beef and cheese to extend the shelf life; 60 In the 1990s, due to various airtight plastic packaging With the development of materials, many foods such as meat, fruits, vegetables, cakes, and tea have successfully adopted the gas replacement packaging technology; in the 1970s, the inflatable packaging of fresh meat was widely used in Europe and the United States. Since then, modified atmosphere packaging has flourished around the world. Modified atmosphere packaging is different from the vacuum packaging machine that needs to use packaging bags, and its working method is also different: first put the product into the tray, then the tray is put into the discharge area of u200bu200bthe equipment, the tray enters the sealing mold with the forward running of the chain, and the mold Rising, the upper film is attached to the tray inside the sealing mold. On the basis of vacuuming, it can also be filled with nitrogen or mixed gas for packaging and sealing. After the upper film is sealed with the tray, the holes are punched, exhausted, and the film is pasted. export material. The continuous air-conditioning equipment is also equipped with a photoelectric alignment color film system, which saves costs for users, improves production efficiency, improves packaging quality, and is equipped with a waste recycling system to maintain environmental hygiene. It can also be equipped according to the user's product packaging requirements. Automatic coding system. Small modified atmosphere packaging machines have two boxes, four boxes or even eight boxes of different specifications, and the manual operation is a little more slow in production. At present, the boxed food on the market is directly sealed, but the preservation time is short. Taking the delivery of fresh hippos as an example, the delivery time is generally within three hours; the modified atmosphere packaged food can be stored for 7-15 days, extending the shelf life. a lot of. Taking chilled fresh meat as an example, there are many forms of modified atmosphere packaging currently used. In order to ensure that the color of cold meat is rosy and full, the mixed gas filled in it has different functions. Brightness; carbon dioxide can inhibit the growth of anaerobic bacteria; the most commonly used gas distribution is: 75% oxygen and 25% carbon dioxide. Since nitrogen plays a filling role, which increases the packaging cost virtually, the mixing ratio of this gas is relatively large. Both the vacuum packaging machine and the modified atmosphere packaging machine have the advantages of novel structure and simple operation. One bag and one box, due to the different packaging forms and product storage methods, the shelf life of vacuum packaging machines and modified atmosphere packaging machines must be different.
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