Definition of Sieves:
- Sieves are devices with mesh or perforated surfaces used to separate particles based on size.
Construction of Sieves:
- Made from woven wire mesh, perforated metal plates, or electroformed mesh.
- Mesh number indicates the number of openings per linear inch. Higher mesh numbers have smaller openings.
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Use in Size Separation:
- Particles are separated by being passed through a stack of sieves with progressively smaller openings.
- The process involves shaking or vibrating the sieves to facilitate particle movement and separation.
Common Mesh Sizes:
- No. 8: 2.36 mm
- No. 20: 850 µm
- No. 40: 425 µm
- No. 60: 250 µm
- No. 80: 180 µm
- No. 100: 150 µm
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Sieve Shaker:
- A mechanical device that ensures consistent and repeatable shaking to improve the efficiency and accuracy of size separation.
Applications :
- Used in quality control and research laboratories for particle size distribution analysis.
- Common in industries like pharmaceuticals, food, chemicals, and construction.
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Advantages:
- Simple and cost-effective.
- Provides precise and reliable particle size distribution data.
Disadvantages:
- Time-consuming for large samples.
- Potential for mesh clogging with fine or sticky materials.
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