The heat of the dehumidifying dryer is transferred from the high-temperature heat source to the wet material in various ways, so that the surface of the material evaporates and dissipates to the outside space, so that the difference in moisture content appears on the surface and inside of the material. The internal moisture diffuses to the surface and evaporates, so that the moisture content of the material is continuously reduced, and the drying of the entire material is gradually completed.
Generally, the drying rate in the early drying stage is controlled by the surface evaporation rate. Then, as long as the external drying conditions remain unchanged, the drying rate and surface temperature of the material will remain stable. This stage is called the constant rate drying stage.
The drying rate of the dehumidifying dryer material depends on the surface evaporation rate and the diffusion rate of internal moisture. In the plastic drying machine processing, heat and quality (moisture content) must be transferred at the same time to ensure that the moisture content and vapor partial pressure (concentration) of the material surface is higher than the moisture content and vapor partial pressure of the external space, and the heat source temperature is higher than the material temperature.
First, the moisture on the surface of the material is evaporated by heat and removed by vacuum equipment. Due to evaporation, the moisture on the surface of the material gradually decreases, and a temperature difference is formed between the inside and the surface of the material. Under the action of the temperature difference, the internal moisture continuously diffuses to the surface, and evaporates after reaching the surface, thereby achieving the effect of dehumidifying and drying.
When the moisture content of the material decreases to a certain extent and the diffusion rate of internal moisture components to the surface decreases and is less than the evaporation rate of the surface, the drying rate is mainly determined by the internal diffusion rate, and continues to decrease as the moisture content decreases. This stage is called the deceleration drying stage.
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