Vacuum freeze dryer is a kind of equipment that uses vacuum and low temperature conditions to change the moisture in the material directly from solid to gaseous state through the sublimation process, so as to achieve drying. It is widely used in food, medicine, biological products, electronic devices and other fields, mainly used to preserve and transport moisture, oxidation or perishable items. This article will introduce the working principle, characteristics and application scenarios of vacuum freeze dryer in detail.
First, the working principle.
The vacuum freeze dryer is mainly composed of a refrigeration system, a vacuum system and a heating system. It works by freezing the material below freezing point to keep it solid; Then, by vacuuming, the water in the material is directly sublimated from the solid state to the gaseous state at low temperature, and is pumped out by the vacuum pump; Finally, through the heating system, the ice crystals in the material are sublimated into water vapor and extracted, so as to realize the drying of the material.
2. Features. The vacuum freeze dryer has the following characteristics:
1.The drying process is carried out at low temperature, which can retain the nutrients and biological activity of the material;
2.The dried material is crisp and porous, easy to dissolve and rehydrate, and has a good taste;
3.The drying process is carried out under vacuum conditions, which can prevent oxidation and moisture and prolong the shelf life;
4.Short drying time, high efficiency, suitable for large-scale production;
5.High investment and maintenance costs are required.
3. Application scenarios.
1.Food industry: Vacuum freeze dryers are widely used in the food industry, mainly used for drying and keeping foods such as fruits and vegetables, meat, and aquatic products. Dried food can be stored for a long time and is easy to rehydrate and eat.
2.Pharmaceutical production: Vacuum freeze dryers are used in pharmaceutical production to prepare pharmaceutical dry powder, which is convenient for storage and transportation. Since the drying process is carried out at low temperatures, the biological activity and efficacy of the drug can be guaranteed.
3.Biological products: Vacuum freeze dryers are used in the field of biological products to prepare dry powders of biological products such as vaccines, enzymes, and proteins. These biologics can be stored for long periods of time in a dry state, making them easy to transport and use.
4.Electronics: Vacuum freeze dryers are used in the field of electronics to remove moisture generated during the production process and prevent oxidation and corrosion. At the same time, the dried electronic devices can reduce the size and weight, making them easy to carry and use.
5.Other fields: Vacuum freeze dryers are also widely used in chemical, textile, agricultural and other fields. For example, in the textile field, it is used to prepare dry powder dyes and coatings to improve the performance and quality of textiles; In the agricultural field, it is used to prepare dry powder for seeds and fertilizers, which is convenient for sowing and fertilizing.
IV. Conclusions. As an efficient, energy-saving and environmentally friendly drying technology, vacuum freeze dryer has been widely used in various fields. Its unique advantages make it an indispensable production equipment in the fields of food, medicine, biological products, electronic devices, etc. With the continuous progress of technology and the expansion of application fields, the application prospect of vacuum freeze dryer will be broader.