Temperature Regulation Problem Of Vacuum Freeze Dryer
The vacuum freeze dryer is an excellent drying method. Under dry conditions, the dried product can be stored for a long time without the need of additives at normal temperature. The structure of the freeze-dried product is porous and crisp, and the rehydration is quick when used. The color, fragrance, taste, shape and activity of the articles after rehydration are basically unchanged. The vacuum freeze dryer is especially suitable for the food, health care products and pharmaceutical industries. The vacuum freeze dryer freezes the wet material or solution to a solid state at a lower temperature (-10 ° C ~ -50 ° C), and then directly sublimes the water into a gaseous state without a liquid under vacuum (1.3 to 13 Pa). The drying technique that ultimately dehydrates the material. Vacuum freeze dryer technology is the core guarantee for enterprise innovation transformation, and quality is also the guarantee of product fate. Vacuum freeze dryer manufacturers always adhere to the "quality of survival, efficiency and development" business purposes, dare to be the first, the courage to innovate, and strive to improve product quality, so as to better serve our customers.
The working principle of the vacuum freeze dryer is to freeze the dried articles to below the triple point temperature, and then directly sublimate the solid water (ice) in the article into water vapor under vacuum conditions, and remove the articles from the articles to make the articles dry. After the material is pretreated, it is firstly frozen, then dried by vacuum drying, and then packaged in a post-treatment workshop. The vacuum freeze dryer heating system provides sublimation latent heat to the material, and the refrigeration system provides the required amount of cooling to the water trap and the drying chamber. The quality requirements for freeze-dried products are: constant biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate and low residual moisture. To obtain high quality products, a comprehensive understanding of the theory and process of lyophilization should be obtained. Vacuum freeze-drying process comprises a freeze dryer pre-freezing, sublimation and lyophilized three phases. The vacuum freeze dryer has a reasonable and effective shortening of the freeze-drying cycle and has obvious economic value in industrial production.
