Small freeze drier sublimation drying process is the use of physical principles, namely through the compressor refrigeration freezing of material and vacuum freeze-drying of material, so as to achieve effect of lyophilization.
Its working principle is in the material after frozen below freezing point, vacuum pump to start pumping air into vacuum state, decrease the surface temperature of the material surface vapor pressure and the material, when material below the eutectic point temperature is reached, the material completely become a solid, gas two like coexist, and there is no liquid ingredients.
Gas phase in the solvent in ultra-low temperature of cold trap is captured by the cold trap.
Programmable controller in the process of sublimation by heating the racks continuously provide the energy needed to power a sublimation.
Water content below 1% in the material, the use of limit vacuum of material surface temperature drop to -
Below 50 ℃, residual solvent volatilization under the limit of vacuum.