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Sieves and sifting machines

Sieves, also known as sifting machines or sifters, are industrial machines used to separate and grade materials by particle size. They are commonly used in food processing, pharmaceuticals, chemicals, and other industries where it is important to control the size and quality of the product. Sieves typically consist of a mesh screen or perforated plate that is stretched over a frame. The material to be sifted is fed into the machine, and as it passes over the screen, the smaller particles fall through the openings, while larger particles are retained on the top of the screen. Depending on the application, the sieving process can be performed either dry or wet. The mesh screen or perforated plate can be made of a variety of materials, including stainless steel, brass, nylon, or polyester, depending on the requirements of the application. Sieves can be designed to operate in a variety of ways, including vibration, rotation, or gyratory motion, depending on the specific requirements of the material being sifted. Sieves can also be used for a variety of purposes, including separating oversize and undersize particles, removing impurities, deagglomerating, and blending different particle sizes. They can be used in conjunction with other processing equipment, such as mixers or blenders, to achieve a specific product size or consistency. The working principle of sieves, also known as sifting machines or sifters, is based on the separation of materials according to their particle size. The material to be sifted is fed into the sieve, and as it passes over the screen, the smaller particles fall through the openings, while larger particles are retained on the top of the screen. The process can be performed either dry or wet. The sieve typically consists of a mesh screen or perforated plate that is stretched over a frame. The mesh size of the screen determines the size of the particles that will pass through it. The mesh size is chosen based on the requirements of the specific application, such as the desired particle size range and the flow rate of the material being sifted. The material to be sifted is fed into the sieve through a hopper or other feeding mechanism. The material is then distributed evenly over the surface of the screen, and as it passes over the screen, the smaller particles fall through the openings, while the larger particles are retained on the top of the screen. The sieving process can be performed using a variety of motions, including vibration, rotation, or gyratory motion, depending on the specific requirements of the material being sifted. For example, some materials may require gentle handling, while others may require more vigorous shaking or agitation to achieve the desired separation. The working principle of sieves is based on the separation of materials according to their particle size. This makes them an essential piece of equipment in many industrial processes where it is important to control the particle size and quality of the product. The major components of a sieve or sifting machine include: 1. Mesh screen or perforated plate: This is the main component of the sieve, and it is used to separate the material according to particle size. The mesh size or perforation size is chosen based on the requirements of the specific application. 2. Frame: The mesh screen or perforated plate is stretched over a frame to provide support and stability. 3. Hopper or feeding mechanism: This is used to feed the material into the sieve and distribute it evenly over the surface of the screen. 4. Vibrating motor or another motion mechanism: Depending on the specific requirements of the material being sifted, the sieve may be equipped with a vibrating motor or another motion mechanism to agitate the material and facilitate the separation process. 5. Collection tray: The separated material is collected in a tray or container underneath the sieve for further processing or disposal. 6. Supports and feet: Sieves are often mounted on supports or feet to ensure stability during operation. 7. Control panel: Some sieves may be equipped with a control panel for adjusting the speed and other operating parameters. The key manufacturers of Sieves / sifting machines are as follows: 1. Russell Finex Ltd. 2. VibraScreener 3. SWECO 4. GEA Group 5. Allgaier Werke GmbH 6. Endecotts Ltd. 7. AZO GmbH + Co. KG 8. Bühler AG 9. Kason Corporation 10. Eriez Manufacturing Co.