Key to modified atmosphere packaging
The key to get good modified atmosphere packaging:
Choose a packaging machine with high gas replacement accuracy
The so-called gas replacement is to exhaust all the air in the packaging box, and then refill the fresh gas mixed in a certain proportion to complete the gas replacement. At present, there are two ways for gas replacement of modified atmosphere packaging equipment in the market: Fully enclosed vacuum displacement type and Air flow scouring type.
The principle of fully enclosed vacuum replacement is to put the tray with food in an absolutely closed vacuum chamber, use a vacuum pump (or high oxygen vacuum pump) to evacuate the air in the vacuum chamber, so that the vacuum chamber reaches a certain degree of vacuum, and then fill and mix Keep the gas fresh and seal it to complete the process of gas replacement. This form of gas replacement can make the residual oxygen content in the vacuum chamber less than 1%, ensuring the highest accuracy of the fresh gas filled.
The principle of air flow scouring compensation gas replacement is to use the negative pressure generated by the vacuum generator to extract the air in the tray. While tracing the air, the tray container is continuously filled with a large amount of fresh gas and then sealed. This kind of gas replacement method has high residual oxygen content in the package (the original air in the package cannot always be cleaned), which makes the accuracy of the proportion of fresh gas in each package ununiform, resulting in a serious problem of uncontrolled shelf life of meat food. The equipment using the airflow scour compensation type consumes a large amount of gas during the gas replacement process, and the packaging cost is high.
Conclusion: Fully enclosed direct air replacement technology is the most effective structural form summarized by relevant research institutions in Europe and America after years of repeated experiments. This form can ensure a high replacement rate of mixed fresh-keeping gas, so as to truly achieve the effect of food preservation.
