The dried material is designed to use or further processing needs. Such as the production of wood Rotary evaporator manufacturers wood molding, wood products can prevent the deformation front, ceramic blanks in the dry before calcination finished cracking can be prevented. In addition the material after drying is also easy to transport and storage, as the harvested grain is dried to a certain moisture content or less, to prevent mildew. Due to dry naturally can not meet the needs of production development, all kinds of mechanized dryers more widely applied.

Heat from the heat source in a variety of ways to transfer wet material, so that the material surface moisture vaporize and escape into outer space, so that the difference between the moisture content of the material appear in the surface and interior. Internal moisture diffusion and vaporization to the surface, continue to reduce the moisture content of the material,
The gradual completion of the whole dried material.
The drying rate depends on the material surface diffusion rate and the internal rate of vaporization of moisture. The drying rate is usually dried by early vaporization rate control surface; then, as long as the external conditions remain unchanged drying, drying rate of materials and surface temperature is stable, this stage is called constant drying stage; when the moisture content of the material is reduced to a degree, reduce internal moisture diffusion rate to the surface, and the surface is less than the vaporization rate, drying rate that is mainly determined by the internal diffusion rate, and with lower moisture content and continue to reduce, at this stage called the falling rate drying stage.
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