Freeze dryer is a new type of equipment that combines the refrigeration system, vacuum system, heat transfer oil heating system, and dehumidification system by using the principle of sublimation. Applications. Its technology has many advantages, such as: the loss of some volatile components in the dried material is small; the dried material is loose and porous, and it quickly dissolves after adding water; the volume of the dried material is almost unchanged and the original structure is maintained.
With the continuous improvement of our living standards and quality, people have higher and higher expectations for the quality and effects of cosmetics in recent years. Because we can use a vacuum freeze dryer to obtain biological preparations at ultra-low temperature, which will promote the development of cosmetics towards a purely natural and functional orientation. In addition, a vacuum freeze dryer is used to produce cosmetics, which can preserve the activity, ingredients and quality of biological agents.
Pilot freeze dryer is common in daily life. Air freeze-drying technology, referred to as freeze-drying, is also known as sublimation air-drying. Freeze-drying is a specific method of pre-freezing water-containing materials and then subliming them in a vacuum state to obtain air-dried objects. Freeze-dried objects have basically unchanged original biological and chemical properties, and are easy to store for a long time. After soaking in water, it can be restored to the form before freeze-drying, and its original biochemical properties can be maintained. Therefore, freeze-drying technology is widely used in various fields such as industrial chemistry and medical equipment.
The design of the freeze-drying machine automatic control system requires simple operation, starting from the material into the button, quick-freezing vacuum sublimation and drying in one go, prompting the shutdown after the freeze-drying is completed. Relevant temperature and pressure control points should be carefully selected and properly controlled. The correlation between quick freezing, vacuum holding and heating should be properly controlled, and the process curve should be set for different materials.