How do materials in drying equipment combine with moisture?

drying equipmentThe purpose of its birth is to separate the material from the moisture in the material and obtain a product with relatively low moisture content. If you don't know how the material in the drying equipment combines with moisture, you won't understand the essence of the drying process of the drying equipment. There are many ways to combine material and moisture in drying equipment.
Materials in drying equipment generally exist in three ways: solid, liquid, and gas. I won't explain much about liquids and gases here. They can be seen with the naked eye, and drying is relatively simple. The following will focus on how solid materials are combined with moisture in the drying equipment.

There are many ways to combine solid materials and moisture in drying equipment. The easier way to dry is to adsorb on the surface of the material. When this material is dried, it only needs to be dried by ordinary drying equipment at a suitable temperature.
What is slightly more difficult to dry than the adsorption of water on the surface is the combination of the internal structural cells of the material with water. In this combination, ordinary drying equipment cannot dry quickly and effectively, and some drying equipment with complex structural design is needed to dry, such as vacuum drying equipment and freeze drying equipment.
The above are the combination method of solid materials and moisture in the drying equipment. In fact, there is another combination method of solid materials and moisture, which is chemical combination. However, this chemical combination method does not fall within the range that the drying equipment can dry. Even if using advanced drying equipment for drying, the moisture existing in this chemical combination method still exists in the material and cannot be dried.