What Is a Flash Freezer?
A flash freezer is a commercial rapid freezing device used to freeze perishable and processed foods, such as fish and meat, in a short period. These freezers minimize flavor deterioration often associated with traditional freezing methods. The rapid freezing process, which occurs at temperatures from 30.2 °F to 23 °F, helps preserve the umami components in food by preventing the transformation of moisture in food cells into ice crystals that can rupture cell walls.
Flash freezers are not only instrumental in extending food freshness without compromising taste but also contribute to reducing food loss, aligning with the Sustainable Development Goals (SDGs).
Uses of Flash Freezer
Flash freezers are increasingly used in small businesses like restaurants, school cafeterias, and grocery stores, in addition to large-scale frozen food factories. The COVID-19 pandemic has also prompted restaurants to freeze and deliver dishes nationwide, enhancing sales opportunities and streamlining operations.
Principles of Flash Freezer
Flash freezers operate by rapidly reducing the temperature of food beyond the 30.2 °F to 23 °F range, where the maximum ice crystallization and potential cell damage occur. Various freezing methods include:
- Air-Cooling: Uses cold air at 22 °F to -40 °F for freezing. Compact in design, it may cause surface drying of food, which newer models address by multi-directional cold air flow.
- Liquid-Cooling: Involves immersing food in alcohol cooled below -22°F, offering rapid freezing due to liquid’s higher thermal conductivity. Food must be packed before immersion.
- Liquefied Gas: Sprays liquid nitrogen at -315.4 °F for swift, extreme low-temperature freezing. Requires specific facilities for liquid nitrogen storage and supply, mainly used in mass production of frozen foods.
- Electromagnetic Wave Combination: Applies a strong static electromagnetic field, reducing cell damage and oxidation. Requires additional devices for electromagnetic field generation and wave leakage prevention.
How to Choose a Flash Freezer
When selecting a flash freezer, consider its type, initial and operational costs, and alignment with your business needs. Businesses like restaurants and grocery stores can explore new opportunities with flash freezers. A well-planned strategy, assessing risks and potential profit increase, is crucial for making an informed choice that suits the business structure.