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It is reported that vacuum freeze-drying is carried out under low temperature and high vacuum conditions. The moisture in the material is directly sublimated from a solid state to a gaseous state, which can maximize the activity of the dried material and the color, fragrance, taste, shape, and shape of the dried material. Nutritional ingredients, and rehydration performance.
Vacuum freezing technology is referred to as freeze-drying technology. The AQSIQ Boiler and Pressure Vessel Detection and Research Center is mainly engaged in the optimization research of the vacuum freeze-drying process. The principle of freeze-drying is to use the principle of sublimation in a vacuum state so that the moisture in the pre-frozen materials is directly melted without ice. Ice sublimation is removed by steam to obtain a dry product. Practice has shown that vacuum freeze-drying dehydration technology is a high-tech processing technology that is suitable for color protection, preservation, shelf life preservation and nutrition maintenance of fruits and vegetables, meat, aquatic products, and pharmaceuticals.
In recent years, vacuum freeze-drying technology has developed rapidly in China. So far, a batch of well-prepared and high-performance freeze dryer manufacturers have emerged in the country, among which Shanghai Dong Fulong, Beijing Bo Yikang, and thousands of The companies such as Shandong Far East focused on the research and development of freeze dryer manufacturing processes. The quality and performance of freeze dryers produced have reached the international advanced level.
At present, China's vacuum freeze-drying equipment industry has begun to enter a more mature stage of development, has been able to better meet the actual needs of users in various fields, and in the price is only less than half of the same foreign products, which makes our country vacuum freeze-drying Equipment has a clear price advantage over imported equipment in market competition. However, any one process or several processes together may become the “bottleneck†of the vacuum freeze-drying process. It depends on the design of the freeze-drying equipment, the operating conditions, and the characteristics of the material being dried. Only at the same time improve the heat transfer, mass transfer efficiency, increase the surface area per unit volume of freeze-dried material, can achieve faster drying rate.
For example, a lyophilized product of a biological product needs a certain physical form, a uniform color, a qualified residual moisture content, a good solubility, an efficient survival rate, and a long shelf life, so not only the production process and the freeze After the dry sealed storage is controlled, it is more important to control each parameter of each stage of the freeze-drying process in order to obtain high-quality products. The freeze-drying curve is the basic basis for controlling the freeze-drying process.
Freeze-dried curve is the relationship between temperature and time of freeze-dried box layer. Generally, temperature is the vertical axis and time is the horizontal axis. It reflects the change of the temperature of the slab during different periods of the freeze-drying process.
The freeze-drying curve is based on the temperature of the plate layer. To set the freeze-drying curve, consider the following factors:
The variety of the product and the product have different eutectic melting points. The eutectic melting point requires a low temperature for pre-freezing, and the temperature of the laminar during heating is correspondingly low. According to the experiment, the optimum freezing rate of a product should be determined to obtain high quality. Product and shorter freeze-drying time.
Different time requirements on residual moisture are also different, require different preservation time on the residual water requirements are also different, the corresponding freeze-dried time is different, the amount of the amount of the other, the type of secret device, the performance of the freeze dryer and other factors Are directly related to the formulation of the freeze-drying curve, users should be based on the nature of freeze-dried products, with reference to the previous freeze-dried experience, set freeze-dried curves in order to obtain high-quality freeze-dried products.
Today, China's vacuum freeze-drying equipment industry has begun to enter a relatively mature stage of development, the prospects for the production of vacuum freeze-drying equipment companies. However, compared with the advanced technology of developed countries, China's vacuum freeze-drying technology still has a certain gap. Therefore, China's related companies still need to continue to make efforts to increase research and innovation in this area to promote the development of the domestic drying equipment industry.
Let vacuum freeze-drying become an important application technology in the 21st century
Freeze dryer is a more advanced material dehydration and drying equipment, the principle is to freeze the water content in low temperature, and then make the water in the vacuum sublimation directly, and use the condensation method to capture and condense sublimation of water vapor, To achieve the purpose of dehydration of the material. After entering the 21st century, vacuum freeze-drying technology has become more and more popular because of its incomparable advantages over other drying methods. It is widely used not only in the fields of medicine, biological products, food, blood products, active substances, but also in the scale and field of its application.