Freeze dryer manufacturer

Freeze dryer manufacturer - Kassel, vacuum freeze dryer, like other drying methods, must meet two basic conditions to maintain continuous sublimation drying, namely continuous supply of conversion and continuous elimination of steam generation. In the initial stage, if the material temperature is relatively high, the latent heat required for sublimation can be taken from the sensible heat of the material itself. But with continuous sublimation, the material temperature quickly drops to a temperature that is in equilibrium with the vapor pressure in the drying chamber. At this point, if there is no external heating, sublimation drying will stop. In the case of external heating, if the steam generated by sublimation is not eliminated in a timely manner, the partial pressure of steam will increase, and the temperature of the material will also increase. When the freezing point of the material is reached, the ice crystals in the material will melt, and freeze-drying cannot be carried out.

The process of supplying is a heat transfer process, while the process of removing steam is a mass transfer process. Therefore, the sublimation drying process is a process of simultaneous heat and mass transfer. Any process that occurs in nature has a driving force. The heat transfer driving force in sublimation drying is the temperature difference between the heat source and the sublimation interface, while the mass transfer driving force is the steam partial pressure difference between the sublimation interface and the steam trap (or cold droplet). The larger the temperature difference, the faster the heat transfer rate; The larger the steam partial pressure difference, the faster the mass transfer (i.e. steam removal) rate.

The latent heat required for sublimation must be transferred from the heat source to the surface of the dried material through an external heat transfer process, and then transferred to the actual location of ice sublimation inside the material through an internal heat transfer process. The generated water vapor must reach the surface of the material through an internal mass transfer process, and then be transferred to the steam trap (cold) through an external mass transfer process. Any one or several processes together can become the "target" of the drying process, which inevitably involves the design of freeze-drying equipment, operating conditions, and characteristics of the dried material. Only by simultaneously improving heat and mass transfer efficiency and increasing the volume of freeze-dried materials per unit volume can it achieve a rapid drying rate.

Water has three phases: solid, liquid, gas, and gaseous. According to the phase equilibrium theory in thermodynamics, as the pressure decreases, the freezing point of water does not change much, while the boiling point decreases and approaches the freezing point. When the pressure drops to a certain degree of vacuum, the boiling point and freezing point of water coincide, and ice can vaporize directly into gas without going through a liquid state, a process called sublimation. Vacuum freeze-drying of food is the process of sublimating and removing frozen moisture from food below the carbonation point of water, i.e. under low temperature and low pressure conditions.
Vacuum freeze dryerFeatures:

The vacuum freeze-drying machine has the characteristic of maintaining the inherent active and nutritional components of substances unchanged, and the physical, chemical, and biological states remain basically unchanged. After drying, the color, aroma, taste, and shape of the goods remain unchanged, and even after several years of storage, rehydration can still maintain their original flavor and active components. The machine has the advantages of good freeze-drying effect, fast drying speed, complete adjustment mechanism, stable operation, correct operation, intuitive display, reliable use, convenient maintenance, and is more energy-saving than similar products. Kassel provides affordable and energy-saving vacuum freeze-drying equipment for food processing enterprises.

Freeze dryer manufacturer - Kassel, with a complete pre-sales and after-sales service system, can provide you with product selection consultation, gradually undertake factory layout, design, supporting, installation, commissioning and commissioning services, and contract turnkey projects. We can provide freeze-drying process consulting services for various products. By ordering one set of the above series of equipment, we can provide freeze-drying processes for two products free of charge.