Principle and function: The vacuum drying oven is designed for drying heat-sensitive, easily decomposed and easily oxidized substances. It can be filled with inert gas inside, especially for some items with complex composition can also be quickly dried. Widely used in electronics and chemical industry.
General electric heating (blast) drying ovens are equipped with temperature uniformity parameters (national standards): natural convection drying ovens have an upper limit of working temperature multiplied by 3%, and forced convection drying ovens have an upper limit of working temperature multiplied by 2.5%. Only the electric vacuum drying oven does not set the temperature uniformity parameter, why?
There is almost no possibility that the temperature of the working room can be evened by the movement of gas molecules in the vacuum drying oven. Therefore, conceptually, we can no longer apply the definition of temperature uniformity prescribed by the usual electric heating (blast) drying oven to the vacuum drying oven.
It is meaningless to set this index under vacuum. The amount of heat radiation is inversely proportional to the square of the distance. For the same object, the radiant heat received at 20 cm from the heating wall is only 1/4 of that at 10 cm from the heating wall. big difference. This phenomenon is the same as when the sun is shining in the winter, the sun is very warm on the side, and the cold side is cold. Due to the structural difficulty of the vacuum drying oven, it is difficult to make the radiant heat uniform at all points (circular spherical surface) in the three-dimensional space of the studio, and it also lacks authoritative evaluation methods. The reason for the temperature uniformity parameter.
Wooden Stick,Round Heads Cotton Buds,Cotton Buds,Wooden Stick Cotton Bud
COTTONWHISPER (TAIZHOU) DAILY PRODUCTS CO.,LTD , https://www.zjcosmeticpuff.com