Introduction to Freeze Drying Machine

　　Freeze dryer, also known as freeze dryer or freeze dryer, is a device used to freeze substances and evaporate them under reduced pressure in a vacuum environment, directly transforming the moisture in the substance from solid to gas (sublimation), thereby achieving the purpose of drying. This technology can maintain the original shape and chemical properties of substances, and is widely used in various fields such as food, medicine, scientific research, electronics, aerospace, etc.

　　1、 Working principle

　　1. Pre freezing stage:Place the substance to be processed into the freezing chamber of the freeze dryer, and rapidly freeze it below the eutectic point by controlling the temperature and humidity, causing the moisture in the substance to condense into solid ice crystals.

　　2. Sublimation stage:In a vacuum environment, the heating system provides sublimation latent heat to the material, causing frozen water molecules to sublime directly into water vapor and escape, bypassing the liquid stage. The vacuum system maintains an appropriate degree of vacuum to facilitate the sublimation process.

　　3. Analyze the drying stage:After most of the ice crystals in the material have sublimated, the remaining small amount of bound water requires a higher temperature to be removed. At this point, continue heating and maintaining a vacuum environment to further sublime these bound waters, achieving the final drying effect.

　　2、 Main components

　　1. Freezing room:It is usually made of stainless steel and has an adjustable temperature and humidity control system inside for placing the material to be processed and pre freezing.

　　2. Vacuum system:Extract air through pumps (such as rotary vane pumps, Roots pumps, etc.) to create and maintain a vacuum environment to facilitate the sublimation process.

　　3. Heating system:By conducting, convection, or radiation, heat is transferred to provide the required thermal energy for sublimation and desorption drying stages.

　　4. Refrigeration system:Provide the required cooling capacity to the cold trap and drying chamber to capture the water vapor generated by sublimation and prevent it from re condensing on the material.

　　5. Control system:Monitor and adjust temperature, humidity, vacuum and other parameters to ensure control and stability of the drying process.

　　3、 Technical features

　　1. Maintain the original shape and chemical properties of the substance:Due to the drying process being carried out at low temperatures, the thermosensitive components in the substance are not easily destroyed and can maintain their original shape and chemical properties.

　　2. Extend shelf life:Freeze drying can remove moisture from substances, reduce microbial growth and enzyme activity, thereby extending their shelf life.

　　3. Easy to transport and store:The volume of the dried substance remains almost unchanged, it is lightweight, and easy to transport and store for a long time.

　　4. Restore original appearance after adding water:After drying, the substance is loose and porous, appearing sponge like. It can quickly and completely dissolve when water is added, restoring its original properties.

　　4、 Application Fields

　　1. Food industry:Used for the processing and preservation of fruits, vegetables, meat and other foods. Freeze drying can remove moisture from food, extend shelf life, and maintain the taste and nutritional value of food.

　　2. Pharmaceutical industry:Used for the preservation and production of bioactive substances such as drugs, biological products, and vaccines. Freeze drying can maximize the biological activity of these substances and facilitate storage and transportation.

　　3. Research field:Used for samples that require drying, such as chemicals, soil, minerals, etc. Freeze drying plays an important role in these experiments, as it can maintain the original structure and chemical properties of the sample.

　　4. Electronic industry:Used for the manufacturing of electronic components and circuit boards. Freeze drying can remove moisture and avoid the impact of moisture on the performance of electronic components.

　　5. Aerospace field:Used for the production of high-precision and high reliability mechanical components and materials. Freeze drying can ensure the quality and performance of these materials.

　　5、 Operation precautions

　　1. Sample pretreatment:Select appropriate methods for pre-treatment based on sample characteristics, such as reducing sample temperature or adding protective agents.

　　2. Equipment inspection:Before starting, check whether the vacuum pump, refrigeration system, heating system, etc. are working properly, and ensure that all external bottle rubber valves, instrument outlet valves, etc. are closed.

　　3. Operation process:Follow the operating procedures for pre cooling, vacuum pump preheating, sample placement, process definition, etc., and set appropriate temperature, vacuum degree, and time parameters.

　　4. Security maintenance:Use a grounded power socket, keep the sealing ring clean, regularly replace the vacuum pump oil, and avoid frequent power and refrigeration.

　　6、 Market situation

　　There are many brands in the freeze dryer market, with prices ranging from tens of thousands to millions of yuan, depending on factors such as model, capacity, and performance. Well known brands such as Yadu, Delma, Xinzhi, etc. have high visibility and user reputation in the market.

　　7、 Summary

　　Freeze dryer is an efficient and energy-saving drying equipment widely used in various fields. Its unique working principle and technical characteristics enable the dried substance to maintain its original shape and chemical properties, extend its shelf life, and facilitate transportation and storage. With the continuous advancement of technology and the increasing demand for applications, freeze dryers will play an important role in more fields.

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