Difference between Vacuum Drying Oven and Blast Drying Oven

Both vacuum drying ovens and blast drying ovens are drying devices commonly used in our daily life. They both play an important role in biological, chemical, pharmaceutical, scientific research, environmental protection and other fields. But in order to achieve the optimal drying effect, we should choose appropriate ovens to dry materials based on different needs. Therefore, how should we choose a proper drying oven and what is the difference between these two types of ovens. The following will distinguish them from their drying methods and working principles.

Different Drying Modes

1. Vacuum drying oven: it drys materials by using a vacuum pump to   vacuumize the system.

2. Blast drying oven: it drys materials by direct heating and utilizing a air blower to circulate the air in the box.

Different Working Principles

1. Vacuum drying oven: Under vacuum or low pressure, the boiling points of moisture, solvent and other volatile components in the material will become lower so that they can be separated from the material particle surface and be removed by a vacuum pump at a relative low temperature. It is mainly applicable for materials that will oxidize, polymerize or have other chemical reactions at high temperature. Furthermore, it can heat to accelerate the volatilization of moisture, solvent and volatile components so as to separate from the material surface.

2. Blast drying oven: a electric blast drying oven works by heating moisture, solvent or volatile components to make their molecular move rapidly to separate from the material. This drying mode has a high temperature and rapid speed. Under the action of draught fan, the molecular escaped from the material surface can be removed by the air exchange so that samples can be dried quickly.

How to Choose a Proper Drying Oven between Them?

The vacuum condition of a vacuum drying oven greatly reduces the boiling point of liquid that is required to be removed. Thus, it is suitable for rapid and efficient drying of heat-sensitive, easily decomposed, easily oxidized materials and complex components. It can not only lower drying temperature, but prevent some materials from oxidizing in contact with air. The vacuum drying oven can efficiently cut down the drying time for samples that are not easy to dry, such as powder or granular sample. Furthermore, various complex mechanical components or other porous samples can adopts the vacuum drying method after cleaning, without leaving any substance. You can choose a vacuum drying oven if your samples belong to the above. For other ordinary samples, you can choose an electric blast drying oven.

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