The long strip mesh is suitable for classifying the particles according to the degree of floating, because the long mesh holes can face the mesh holes and pass through the mesh holes with thickness regardless of the particle thickness H, regardless of the width of the particles;

The circular mesh is suitable for classifying the particle width because the circular mesh does not pass through the mesh when its pore diameter d is only greater than the thickness H. Only when the pore diameter d is larger than the particle width B can the particles pass through the mesh. (The above assumptions are that the length, width and height of the particles are LBH and L>B>H)

The shape of the mesh hole directly affects the effective area of the sieve, and the effective area refers to the ratio of the area occupied by the pure sieve hole of the sieve to the geometric area of the sieve surface, which is also called the effective sieve surface. The larger the effective area of the sieve, the greater the number of sieve holes per unit sieve surface, and the greater the probability that the material will pass through the sieve hole, so the productivity and screening efficiency are higher. In the screening practice, the commonly used mesh openings are circular, square and rectangular. The sieve holes of the punching screen surface are mostly round, and the woven screen surface has a rectangular hole and a square hole. Practice has proved that the screen surface with different mesh shapes has different effective screen area and the chance of the grain passing through the screen. The sieve mesh of the rectangular mesh has the largest effective area, followed by the square, and the circular mesh has the smallest effective area, so the unit mesh surface productivity is also decreased in the above order. Another advantage of the rectangular mesh hole is that the mesh hole is not easy to be blocked, because the mineral grain passes through the sieve: the hole only needs to contact the three sides or both sides of the mesh hole, and the resistance is small. However, the disadvantage is that it is easy to make long strips and flakes of mineral particles pass through the sieve holes, so that the particle size of the product is not uniform.

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