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Cryogenic IQF freezers immerse the product in liquid nitrogen at very low temperatures, freezing it rapidly while continuously moving the product to avoid block or lump formation. [5] Although this method shows good freezing results, it might lead to higher processing costs per weight of product due to the cost of the liquid nitrogen required.
Cryogenic freezing is the quickest freezing technology available due to the ultra low liquid nitrogen temperature −196 °C (−320 °F). [2] Preserving food in domestic kitchens during modern times is achieved using household freezers. Accepted advice to householders was to freeze food on the day of purchase.
This rapid freezing is done by submerging the sample in liquid nitrogen or a mixture of dry ice and ethanol. [6] American inventor Clarence Birdseye developed the "quick-freezing" process of food preservation in the 20th century using a cryogenic process. [7] In practice, a mechanical freezing process is usually used due to cost instead.
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Dippin' Dots are stored and transported at –40 degree Fahrenheit (–40 °C), which is colder than most frozen foods require. The company's development of ultra low temperature freezers, proper storage and transportation got the company involved from about 1988 with selling their equipment for other uses, such as preserving microbiological cultures for fermentation.
In 2005, Cantu began experimenting with liquid nitrogen to flash-freeze food, and helium and superconductors in an attempt to levitate them. He purchased a class IV laser (the highest grade available) to cook the interior of fish while leaving the outside raw, and create "inside out bread" with a doughy exterior and crusty interior. [3]
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