Drying is one of the ways to keep the material from spoilage. There are many methods of drying, such as IQF Freezing , boiling, spray drying and vacuum drying. However, these drying methods are carried out at temperatures above 0C or higher. The product obtained by drying generally shrinks in size and hardens in texture. Some substances are oxidized, and most of the volatile components are lost. Some heat-sensitive substances such as proteins and vitamins are denatured. Microorganisms lose their biological vitality, and the dried substances are not easily dissolved in water.
Therefore, the dried product has a large difference in properties compared with that before drying. The IQF Freezing method is different from the above drying method, and the drying of the product is basically carried out at a temperature below 0C, that is, in a state where the product is frozen, until the later stage, in order to further reduce the residual moisture content of the dried product, the product is allowed to rise. To a temperature above 0C, but generally does not exceed 40C.
IQF Freezing involves freezing a large amount of water, freezing it to a solid beforehand, and then directly sublimating the water vapor under vacuum. The substance itself remains in the ice shelf when it is frozen, so it has a constant volume after drying and is loose and porous. The ice or other solvent in the frozen product absorbs heat during sublimation. The temperature of the product itself is lowered to slow down the sublimation speed. In order to increase the sublimation speed and shorten the drying time, the product must be properly heated. The entire drying is carried out at a lower temperature.
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