Nitrogen is an inert gas that can significantly reduce the oxygen content inside the package. The growth and reproduction of most aerobic microorganisms (such as bacteria, molds, and yeasts) require oxygen. In a low - oxygen or oxygen - free environment, the activity of these microorganisms will be inhibited. For example, in the packaging of meat products, the use of a nitrogen - sealing machine can reduce spoilage caused by microorganisms and extend the shelf - life of the meat, keeping it fresh during the shelf period.
Prevention of Oxidation Reactions
Many components in food and products (such as fats, vitamins, pigments, etc.) are prone to oxidation reactions with oxygen. Take nuts as an example. Nuts contain a large amount of unsaturated fatty acids. In an aerobic environment, these unsaturated fatty acids will be oxidized, producing an unpleasant "rancid" smell and leading to the loss of nutritional components. The nitrogen - sealing machine can effectively prevent such oxidation reactions and maintain the flavor, color, and nutritional components of the product.
In terms of Product Protection
Physical Protection
Nitrogen acts as a buffer inside the package. When the product is subjected to external compression, collision, or vibration, nitrogen can absorb and dissipate this energy, reducing product damage. For example, in the packaging of electronic components, precision electronic chips and other components are very susceptible to physical damage. After using nitrogen - sealed packaging, nitrogen acts like a "protective pad" to protect electronic components from damage during transportation and storage.
Maintenance of Product Integrity
For some fragile or irregular - shaped products, nitrogen can fill the gaps inside the package, keeping the products in a relatively stable position and preventing them from rubbing and colliding with each other and getting damaged. For example, in the packaging of glass or ceramic products, nitrogen can help the products maintain their integrity better.
In terms of Packaging Appearance and Convenience
Maintenance of Packaging Shape
Nitrogen filling can keep the packaging in a full - looking shape. In some flexible - packaged products (such as bagged potato chips), without sufficient gas support, the packaging may wrinkle or collapse, affecting the product's display effect. After using a nitrogen - sealing machine to fill nitrogen, the packaging can maintain a good shape and be more attractive, helping the product stand out on the shelf.
Convenient Opening and Use
Nitrogen - sealed packaging is usually easy to open, and the state of the product inside the packaging is also more convenient for consumers to use. For example, some powdered products in nitrogen - filled packaging will not agglomerate due to compression, and consumers can pour or take out the product more conveniently after opening the packaging.
