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Modified atmosphere fresh-keeping packaging, also known as MAP, modified atmosphere packaging or replacement gas packaging, inflatable packaging. It uses food packaging materials with gas barrier properties to package food.According to the actual needs of customers, a certain proportion of mixed gas is filled into the package to prevent food from physical, chemical, biological and other aspects of quality decline or slow down the speed of quality decline, thereby extending food shelves Period to enhance food value.

During the ravages of the new coronavirus, masks have become a necessary protection product for everyone to go out, but masks have positive and negative points. What will happen if the masks are worn reversed?