Non-freeze-drying technology cold vacuum means utilizing a temperature below the eutectic point, the material with dry cold air dried dehydrating operation, the typical example is the material that occurs when the frozen storage at low temperature after the library The dry consumption process, as this dehydration is unfavorable for the stored product, should be avoided as much as possible.
Non-cold vacuum freeze-drying is to use this phenomenon to achieve the purpose of dehydration, however, in order to achieve the scale of production of dehydration, we must find ways to increase their rate of dehydration. In fact, in this process, the phenomenon that solid ice is directly vaporized into water vapor occurs. At this time, the sublimation power is the difference in humidity between the surface of the ice and the dry cold air, but due to the dry cold air on the ice surface. The difference in humidity is relatively small, the rate of sublimation is not large, and the whole dehydration process is relatively long. The cold dry air must be dried before it can be used, and its energy consumption is not small. In the 1960s, foreign countries designed and manufactured such practical devices. After production practice, people realized that it did not have most advantages, so there was little progress in this technology field.
In recent years, people at home and abroad have used this source of cold source to complete this dehydration process. It is said to use local low temperature weather in the northwest or northeastern winter, and then use a very clever way to process the materials to be processed. Heating (supplying sublimation heat) to perform the drying operation. I have seen this method of drying products, with the naked eye, you can see that the pores on the surface are larger than the vacuum freeze-dried , it is speculated that it may be partially dissolved during the drying process.
Later, according to the principle that dry cold air can dehydrate, the sublimation temperature of this technology is raised to near normal temperature. This is the no-heat drying technology. Accurately speaking, it should be called non-heating air drying technology. In this temperature range, the water is not removed by sublimation, but is removed by evaporation. Unlike ordinary drying, it evaporates water at a lower temperature. Another branch of the technology is to use an inert gas such as nitrogen as the medium instead of air. Some researchers have also published papers and applied for patents. They have also heard that some people have been promoted or rated for senior titles. Some researchers have even predicted that the technology products will replace freeze-dried products about five years ago. The products of technology have passed more than 5 years. The author did not see their predictions become reality, but saw the rapid development of the freeze-dried food industry.
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