Why freeze dryer samples frozen?
This you need to understand the working principle of freeze-dried, refrigeration equipment, under the low temperature environment substances inside water freezes solid first, and then make the moisture from the solid sublimate to gas, to remove moisture and ways of preserving material.
The lyophilization process mainly includes the precool in low temperature and vacuum freeze drying two parts, the lyophilization process is the process of water movement and change of state, the change and movement occurs under the low temperature low pressure.
with the conventional drying in a different way, by raising the temperature of drying equipment, under the effect of high temperature, makes the moisture to evaporate, resulting in dry goods, but under the action of high temperature shrinkage, loss of nutrients.
Freeze drying machine is making items dehydration vacuum low temperature drying, because of low temperature drying, the component and biological characteristics of items.
This is also the development of science and technology, the new drying technology products.