What is the difference between vacuum oven and hot air circulation oven in drying effect

In general, before the formal production, the raw materials are tested in a small amount to check whether the raw materials, formula, performance, and other aspects meet the requirements. If they meet the requirements, they can formally carry out mass production. Some people will find that vacuum drying is required for many small-scale tests, and a hot-air circulation oven is often used in actual production. What is the difference between the two drying effects?

Hot air circulation oven: it is a kind of heating device with a blast device. It mainly uses a heater and blower. The air enters through the air inlet. After heating, the moisture is taken away from each layer of the drying plate from top to bottom. Finally, the hot and humid air is discharged from the oven by the outlet. If the discharged hot and humid air is not saturated, it still has some use-value. The air conditioner can be used to make a part of it This kind of oven is widely used, especially for western medicine preparation.

Vacuum oven: it is a method of drying after the air is removed from the closed container. This drying method can not only accelerate the drying and reduce the temperature but also make the dried products lose and easy to be crushed. In addition, because air extraction reduces the influence of air, it has a certain significance to ensure the quality of products; this kind of oven is widely used in traditional Chinese medicine preparations, especially suitable for the drying of the extract and the drugs sensitive to damp heat, and has an obvious improvement on the properties of the extract powder which is a headache due to the property requirements in the traditional Chinese medicine preparation.



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