Vacuum drying machine is to be dry material under vacuum conditions for heating and drying. It uses the vacuum pump to pump the gas, the studio is in the vacuum state, the material drying rate is greatly accelerated, but also saves energy.
Vacuum drying machine and dynamic dryer. YZG cylindrical, FZG square vacuum dryer is a static vacuum dryer, SZG double cone rotary vacuum dryer is a dynamic dryer. Material in static dryer in drying, the material is in a static state, body can not be damaged, before drying can also disinfected; materials in dynamic dryer drying non-stop stirring and drying more uniform and sufficient.
Vacuum material and solvent boiling point is lower, so the application in drying unstable or heat sensitive materials: vacuum dryer has good sealing property, it is also applicable to drying solvent recovery and harsh, toxic gas material.
Vacuum drying machine has been widely used in pharmaceutical, chemical, dyes and other industries, in accordance with the drug management standards GMP requirements.
The drying of vacuum drying machine is to lower the boiling point of the wet in the condition of lower than normal pressure. Removal of moisture content in the material to achieve the purpose of drying at low temperature. Vacuum drying machine has many advantages:
1, the drying of the vacuum dryer can be sterilized. In the air, some bacteria are floating in the air, and they carry some bacteria in the air. When the vacuum is dry, most of the bacteria in the air can be removed by the air. This is very useful for food drying.
2, the drying of vacuum drying machine can achieve low temperature drying. Water temperature and pressure in the process of vaporization is proportional to the pressure. Therefore, low temperature can be achieved under low temperature, which is favorable for the drying of food and agricultural products.
3, vacuum dryer drying occurred easily trimmed away under the condition of atmospheric drying products surface hardening phenomenon, atmospheric air drying in the fluid boundary layer formed on surface of the material drying and heating steam gasification through the object boundary layer to the air diffusion, the dry matter of the internal water to move toward the surface. If the mobile speed to catch up with the edge of the interfacial evaporation rate, boundary layer of water film will rupture, dry surface will appear limited parch and split phenomenon, then expanded to the entire outer surface, forming surface hardening. The pressure difference between the interior and the surface of the vacuum drying material is bigger, and the water is moved to the surface quickly under the pressure gradient, and the surface hardening is not appear.
4, vacuum dryer can overcome hot-air drying produced volatile lost phenomenon, hot air drying the inner and surface of material drying to form a large temperature gradient, the material drying moisture carryover volatiles move together. Especially volatile components, because it is not stable material, from being dry matter distribute them out, especially for food, aroma loss, affect the delicious, vacuum drying material inside and outside temperature gradient is small, by reverse osmosis to as solvent wet points move alone, overcome the solute loss.
5, a vacuum dryer easy to achieve product diversification, to dry foods, for example, through the control of vacuum degree, the foam products to produce embrittlement, instant food.
6, the vacuum drying machine can be recovered in the low temperature, which is beneficial to the drying of solvent containing organic solvent.
Because of the above advantages, the application field is gradually expanding, and the demand of vacuum drying machine is increasing year by year.