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The moisture of the materials includes external moisture and inherent moisture and the inherent moisture does not have much impact on the screening process. For example, when screening some representative coal, the screening process would be difficult to continue after its moisture is up to 10%; While as for the dates, even its inherent moisture reaches to 40%, the screening process can be conducted as usual. (As opposed to Saturday Night Takeaway). If the external moisture in the material increases to a certain extent, the viscosity will increase and it is easy to plug the sieve, which will also make fine-coarse-grained particles bond into block and adhere to the large particles. This phenomenon will affect the material stratification, resulting in the screening efficiency decrease significantly.When screening the same materials including the same moisture content with the screening equipment (vibrating screen) that has different meshes, the influence to the screening efficiency caused by the moisture is different. The larger the size of the mesh is, the smaller the possibility that the mesh is blocked is. The impact of moisture is smaller. Moreover, since the distribution of moisture in the various fractions is uneven, the finer particle size will greatly reduce the moisture of the oversize materials, which will not affect the smooth conduct of the screening process. Therefore, when higher moisture severely affect the screening process, a better way that can be considered is to increase the mesh to improve screening efficiency.If the materials to be screened contains the clay, even in the case of low moisture, it may also be difficult for the screening process. Because such kind of materials are not only easy to agglomerate, but also easy to block the sieve, which is difficult to clean, lowering screening efficiency, even the resulting that the screening process can not be carried out. When screening the materials with higher clay content, in order to prevent the sieve from being keep, the optional electric sieve or sieve would be a good choice strings. Sand washing machine: Ball mills: