Sifting is a screening process to exclude foreign matter / particles (if any) and particles beyond the required size.
Sifting is carried out by allowing particles to pass through specified mesh under the influence of vibration and gyration.
The mesh (sieve) size is specified as the number of pores on 1 inch. Example 100 mesh indicates 100 pores on one linear inch.
FUNCTIONS OF SIFTER:
- The main function of sifter is to separate larger and undesirable particles from raw materials.
- Secondary sifting for removal of agglomerates from the raw materials.
OPERATING PRINCIPLE OF SIFTER:
- Sifter consist of screen / mesh placed on the base plate attached centrally to gyratory motor.
- The material fed through the inlet located on the top is dropped on the screen / mesh.
- The particles smaller than the screen / mesh size passes from the screen / mesh and the larger particles are remained on the screen.
PARTS OF SIFTER:
- Sieve
- Sieve ring
- Sifter clamp and Gasket
- Motor
- Screws to hold the ring
CONTROLS AND CHECKS IN SIFTING OPERATION:
- Checking of sieve integrity before and after the sifting operation
- Checking of Gasket integrity before the operation
- Check the sieve size
- Do not over tight the bolts.