What is Vacuum Freeze Dryer ? Freeze drying is a technique by which material is frozen, then dehydrated by sublimation with retention of form. Sublimation is the process by which the contained water passes directly from a frozen to a gaseous state, avoiding a liquid state completely. In the first step before vacuum freeze drying, the water-damaged articles are quickly frozen. This minimizes the accumulation of ice which can accident the cardboard in water-damaged books, documents. Frozen actual is placed in a exhaustion alcove analysis area the freeze-drying action takes place. The time bare to absolutely dry abstracts varies according to the array of the material, blazon of paper, and the amount of saturation. Exhaustion benumb dehydration does not distort, is noninvasive, and produces no actinic damage.

1. The advantages of freeze-drying:

Compared with the usual drying, boiling drying, spray drying and vacuum drying, freeze-drying has the following outstanding advantages.

a. Lyophilization is dry at low temperatures, does not denature protein, but can make microorganisms lose their biological activity. This is especially useful for the dry storage of bioactive, biochemical, genetically engineered, and blood products that have poor thermal stability.

b. During low-temperature drying, the growth of microorganisms and the enzyme’s action are almost impossible to process, thereby maintain the original properties of the material.

c. After drying, the volume and shape are basically the same, the material is sponge-like, no shrinkage, and the contact surface with water after rehydration is large, and can quickly return to the original shape.

d. Due to the fact that it is usually dried under vacuum, there is very little oxygen and the easily oxidized substances are protected.

e.Can remove 95% to 99.5% of water in the substance ,the finished product has long shelf life . More information click gf-machine or https://www.gf-machine.com/product/vacuum-freeze-dryer/