Mechanical screening is a process that involves the use of a device to separate particles, materials or substances from a mixture based on size. It often involves the use of a vibrating or rotating screen that has a number of different sized screens, or meshes, which the material falls through like a sieve. The material that passes through the screen is then collected and then processed further. Mechanical screening is used in a variety of industries, such as mining and mineral processing, agriculture, pharmaceutical, food, plastics, and recycling.