•Food
Freeze Dryer
originated from the vacuum freeze-drying technology in the 1820s, and into the 21st century, vacuum freeze-drying technology has been widely used in the fields of medicine, biological products, food, blood products, and active substances.
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It
takes advantage of the scientific principle of “sublimation,” the direct transition of a solid to a gas, by removing ice (the solid) from frozen food as water vapor (a gas).
It's using sublimation, the food retains much of its original texture, flavor, and nutrition when rehydrated.