Which Foods Require Nitrogen Generators During Production And Packaging?

A food packaging nitrogen generator is a device used to inject nitrogen gas during the food packaging process. It primarily serves to extend the shelf life of food, maintain freshness, and prevent oxidation.

1. Principle of Nitrogen Preservation

Nitrogen (N₂) is a colorless, odorless, and non-toxic gas that constitutes 78% of the air volume. Due to its stable chemical properties and low reactivity with other substances, it is widely used in food preservation. In food packaging, nitrogen primarily displaces oxygen (O₂) within the package, thereby slowing oxidation reactions, inhibiting microbial growth, and preventing spoilage. Oxygen is the primary factor causing food oxidation, discoloration, flavor loss, and nutrient depletion, while also being essential for the proliferation of aerobic microorganisms. By filling packaging with nitrogen, the oxygen concentration inside can be significantly reduced—typically maintained below 1%—to achieve optimal preservation.

2. Primary Functions

Extend Shelf Life: Nitrogen replaces oxygen within packaging, slowing food oxidation and microbial growth.

Preserve Food Quality: Prevents discoloration, flavor loss, or spoilage.

Prevents Moisture and Mold: Nitrogen environments inhibit mold and bacterial growth.

3. Application Areas

Nitrogen generators for food packaging have extensive applications, covering nearly all food categories requiring freshness preservation and shelf life extension:

(1) Snacks: Such as potato chips, nuts, puffed foods, etc. Nitrogen-flushed packaging prevents moisture absorption and oxidation, maintaining crisp texture.

(2) Meat and Seafood: Nitrogen-flushed packaging extends freshness, prevents discoloration, and inhibits spoilage.

(3) Dairy Products: Such as cheese, butter, etc. Nitrogen prevents oxidation and microbial contamination.

(4) Baked Goods: Including bread, cakes, cookies, etc. Nitrogen-flushed packaging extends shelf life and preserves texture.

Overall, nitrogen generators in food packaging utilize nitrogen preservation technology to effectively extend shelf life and maintain product quality. This nitrogen-based preservation method offers advantages including simple operation, significant effectiveness, and broad applicability, making it an indispensable part of the food industry.