General
The aim of freeze-drying is to receive a well water-soluble product, which still features the characteristics of the initial good after water is added. By freeze-drying the good is converted into a dry form. In this process enzymatic, bacterial and chemical changes are largely eliminated.
Due to these characteristics freeze-drying is the gentlest method for preserving biological material. The following process steps are performed: Freezing according to optimised time and temperature limit values; freeze-drying (sublimation) according to time, temperature and pressure limit values; subsequent drying of products according to time and temperature limit values.