Therefore, when choosing the sieve sheet, the sieve with large and small holes should be selected under the premise of meeting the standard requirements of feed particle size: however, it should be noted that if the holes are too small, the sieve is not strong enough and rigid enough, and the sieve is easy to be damaged. Perforation phenomenon. Feed machinery manufacturers want you to pay attention to the humidity. Crushing efficiency is inversely proportional to the humidity of the material. When the humidity is higher than 12-14%, the energy required for comminution increases.