Meat floss cakes are often packaged with nitrogen filling, which reduces the oxygen content inside the packaging and prevents air oxidation, mold and spoilage of the meat pancakes. So, nitrogen filled packaging has antioxidant, anti mold and other effects. The effectiveness of nitrogen filled packaging on the shelf life of meat pancakes is often related to the nitrogen concentration in the packaging. If the nitrogen permeability of the packaging materials is high and the amount of nitrogen loss is large, the nitrogen concentration inside the packaging will decrease, while the oxygen content will often increase, thereby affecting the shelf life of nitrogen filled packaging.