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What is rapid freezing?
rapid freezing technology has been developed to solve the problems of conventional freezing methods. There are various rapid freezing technologies, but all of them have been developed with the most important point being to pass through the maximum ice crystal formation temperature range (-1°C to -5°C) as fast as possible.
As mentioned earlier, when passing through this temperature range slowly, the water inside the cells expands, and the expanded ice crystals destroy the cells from the inside.
On the other hand, if food can quickly pass through this temperature range, it will be possible to prevent cell destruction of food and prevent quality deterioration.
rapid or flash freezing for a longer food shelf life
Frozen foods that can be frozen without destroying cell tissues produce almost no drips, which are the flavor components, when thawed, and it is possible to maintain the freshness and texture of the food and return it to the state it was in before it was frozen.
In Japan, rapid and flash freezing, which use ultra-low temperatures of around -50°C, were put into practical use for freezing tuna since 1960, and have contributed to the spread of sashimi and sushi globally.
In order to freeze food quickly, the focus is on lowering the temperature of the chamber and how quickly the low temperature thermal energy can be transferred.
When freezing with the air blast method, the freezer's increased capacity made it possible to generate ultra-low temperature cold air and rapidly freeze the food.
Freezing with liquid nitrogen has also made rapid freezing possible by utilizing its ultra-low temperature.
In addition, relatively new rapid freezing technologies have been developed, such as liquid freezing, which takes advantage of the high thermal conductivity of liquids.
These advances in technology have made a significant contribution to controlling the freshness of food and reducing transportation costs, making it possible to preserve food for long periods of time without being affected by changes in harvest time or product prices.
Discover more details about rapid freezing technology
