The screening equipment is the common process equipment used in the cleaning process of the flour  mill. The screen surface is the main working part of the screening equipment. It is composed of sieve  holes with uniform distribution and shape and size. The screening surface of most screening equipment  is flat, and the screen surface of a few equipments is cylindrical, also known as a cylindrical sieve.

When the raw material flows through the sieve surface, the material with a smaller particle size  relative to the sieve hole can pass through the sieve hole and become the undersize material; the  material with a relatively large particle size flows down along the sieve surface to become the sieve  top material, thereby completing the screening of the material.