The vacuum dryer can eliminate the phenomenon of surface hardening easily caused by normal pressure hot air drying. This is because the pressure difference between the material and the surface of the vacuum dryer is large. Under the action of the pressure gradient, the water quickly moves to the surface, and surface hardening will not occur. In addition, during vacuum drying, the temperature gradient between the inside and the outside of the material is small, and the reverse osmosis effect enables the solvent to move and collect independently, effectively overcoming the phenomenon of solvent loss caused by hot air drying.
Double-cone rotary vacuum dryer is a widely used equipment for the production of raw materials. This is because in the process of vacuum dryer, the pressure in the cylinder is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen content is low. Therefore, the production of medicines that are prone to oxidative changes can be dried, and the chance of material contamination can be reduced.
Double-cone rotary vacuum dryer is a drying equipment that integrates mixing and vacuum dryer. It is used as a classic device because of its simplicity, convenience and double effect. It has practicality and economy. Replacement.
Also because the temperature of water is proportional to the steam pressure during the vaporization process, the moisture in the material can be vaporized at low temperature during vacuum drying to achieve low-temperature drying, which is especially suitable for the production of heat-sensitive materials in medicines.
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