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A company in the United States invents a new method of preservation
A U.S. company invented a new method to reduce oxygen content and increase nitrogen content in packaging boxes to keep fruits and vegetables fresh. The method uses a new type of packing box with air-conditioning properties for transportation. This package has a special film that can absorb oxygen molecules and allow nitrogen to pass through. In this way, after the air enters the packing box through the film, the content of nitrogen in the box can be as high as 98% or more, so that the respiration of fruits and vegetables can be slowed down and the purpose of freshness preservation can be achieved for a longer period of time.